Updated on 2025/07/16

写真a

 
HIRAKI Eiji
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • Doctor (Engineering) ( 2004.3   Osaka University )

  • ph-D ( 2004.3   Osaka University )

Research Interests

  • electrical machinery and apparatus

  • Power Electronics

  • Energy Electronics

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering

Education

  • Osaka University   大学院基礎工学研究科  

    1988.4 - 1990.3

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  • Osaka University   基礎工学部  

    1984.4 - 1988.3

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Research History

  • Okayama University   The Graduate School of Natural Science and Technology   Professor

    2013.10

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  • Yamaguchi University   Graduate School of Science and Engineering   Associate Professor

    2006.4 - 2013.9

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  • Yamaguchi University   Faculty of Engineering   Department of Electrical and Electronic Engineering

    1995.12 - 2006.3

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  • Mazda Motor Corporation   技術研究所

    1990.4 - 1995.12

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Professional Memberships

  • Institute of Electrical and Electronics Engineers

    1996.4

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  • The Japan Institute of Power Electronics

    1995.7

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  • The Institute of Electrical Engineers of Japan

    1995.7

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  • The Institute of Electronics, Information and Communication Engineers

    1995.7 - 2011.7

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Papers

  • Load Observing System Based on Wave Reflection for Soft-Switching Control of MHz-Frequency Resonant Inverter Against Load Fluctuations

    Aoi Oyane, Kazuhiro Umetani, Eiji Hiraki

    IEEE Access   2025

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2025.3587595

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  • Effectiveness Study of Streamlined Fin with Low-Pressure Loss to Improve Heat Dissipation Performance of Heat Sink

    Hiroki Seto, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    INTELEC, International Telecommunications Energy Conference (Proceedings)   2024

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/INTELEC60315.2024.10679005

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  • Compact Hardware Implementation of Power Factor Control for LLC converter with Event-Driven-Timer Based Digital Controller

    Toshiyuki Zaitsu, Yuto Yoshimura, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki, Kazuhiro Horii

    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC   2015 - 2020   2024

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/APEC48139.2024.10509360

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  • Feasibility of Active Reactance Compensator for Autonomously Maximizing Repeater Coil Current of Wireless Power Transfer System Against Variations in Resonant Frequency and Magnetic Coupling Intensity

    Masataka Ishihara, Kazuhiro Umetani, Akihiro Konishi, Eiji Hiraki

    IEEE Access   12   98175 - 98188   2024

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2024.3428864

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  • Parasitic Inductance Network Modeling Method for Power Module Inner Wirings Based on Inductance Matrix Measurement

    Kotaro Kobashi, Kazuhiro Umetani, Masataka Ishihara, Hiroto Sakai, Yuta Okawauchi, Takuto Hayashi, Eiji Hiraki

    Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC   2530 - 2536   2024

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/APEC48139.2024.10509099

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  • GaN-HEMT Power Module of Aluminum-Clad Printed Circuit Boards for Small Power Loop Inductance and High Cooling Performance

    Kazuhiro Umetani, Yu Takehara, Masataka Ishihara, Eiji Hiraki

    IEEE Transactions on Power Electronics   39 ( 10 )   12047 - 12052   2024

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    DOI: 10.1109/TPEL.2024.3431615

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  • Non-Isolated Interleaved High Step-Down DC-DC Converter with Reduced Switched Capacitor Stages and Automatic Current Sharing

    Kazuhiro Umetani, Fumie Ishitani, Taira Shirahase, Masataka Ishihara, Eiji Hiraki

    INTELEC, International Telecommunications Energy Conference (Proceedings)   2024

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/INTELEC60315.2024.10678985

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  • Artificial-Voice-Based Conversational Lecture Video Clips for Flipped Classroom.

    Kazuhiro Umetani, Yoshitaka Toyota, Masataka Ishihara, Eiji Hiraki

    ISIE   1 - 7   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ISIE51358.2023.10228017

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    Other Link: https://dblp.uni-trier.de/db/conf/isie/isie2023.html#UmetaniTIH23

  • Power Loop Inductance Optimization Strategy for Eliminating Turn-off Switching Surge for GaN-HEMT Switching Device

    Kazuhiro Umetani, Kento Tanohara, Koki Abe, Masataka Ishihara, Eiji Hiraki

    2023 25th European Conference on Power Electronics and Applications, EPE 2023 ECCE Europe   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.23919/EPE23ECCEEurope58414.2023.10264302

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  • Autonomous Resonant Frequency Tuner for a 6.78 MHz Inductive Coupling Wireless Power Transfer System to Stably Maximize Repeater Current

    Akihiro Konishi, Kazuhiro Umetani, Member Masataka Ishihara, Eiji Hiraki

    IEEJ Journal of Industry Applications   12 ( 2 )   215 - 227   2023

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1541/ieejjia.22010814

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  • Introduction of Circuit Simulator to Power Electronics Education in Interdisciplinary Educational Environment

    Eiji Hiraki, Masataka Ishihara, Kazuhiro Umetani

    2023 IEEE 10th International Conference on E-Learning in Industrial Electronics, ICELIE 2023   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ICELIE58531.2023.10313100

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  • Rectifier-Integrated Printed-Circuit-Board Winding Structure of Secondary-Side Center-Tapped Transformer for Suppressing Parasitic Resonance between Decoupling Capacitors

    Hiromu Saeki, Kazuhiro Umetani, Tomohide Shirakawa, Masataka Ishihara, Eiji Hiraki

    ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics   1731 - 1737   2023

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    DOI: 10.23919/ICPE2023-ECCEAsia54778.2023.10213516

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  • Design of Embedded Experiments in Power Electronics Class

    Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    2023 IEEE 10th International Conference on E-Learning in Industrial Electronics, ICELIE 2023   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ICELIE58531.2023.10313105

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  • GaN-HEMT Power Module Structure with Single-sided and Double-sided Aluminum-Clad Printed-Circuit Boards for Small Power Loop Inductance and High Cooling Performance

    Kazuhiro Umetani, Yu Takehara, Masataka Ishihara, Eiji Hiraki

    2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023   5531 - 5537   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ECCE53617.2023.10362213

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  • Origin of Common Source Inductance in Power Device Packages with Kelvin Source Terminal

    Kotaro Kobashi, Akihiro Konishi, Kazuhiro Umetani, Masataka Ishihara, Takuto Hayashi, Eiji Hiraki

    2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023   5510 - 5516   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ECCE53617.2023.10362400

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  • Suppression Strategy for Oscillatory False Triggering Between Two paralleled GaN-HEMTs Based on Optimization of Parasitic Inductance

    Ryoma Yoshida, Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023   5406 - 5413   2023

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    DOI: 10.1109/ECCE53617.2023.10362878

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  • Differences in Visibility of Students' Proficiency by Grading Methods in Energy Electronics-related Lectures Based on DX Format

    Eiji Hiraki, Masataka Ishihara, Kazuhiro Umetani

    2022 IEEE 9th International Conference on e-Learning in Industrial Electronics (ICELIE)   2022.10

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/icelie55228.2022.9969423

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  • Solution-Oriented Teaching Method of Electric Power Circuit Design for Online On-demand Video Streaming Lecture Course

    Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    2022 IEEE 9th International Conference on e-Learning in Industrial Electronics (ICELIE)   2022.10

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/icelie55228.2022.9969416

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  • Frequency Dependence Deterioration of AC Resistance in Large-Diameter Litz Wire for High Power Induction Heating

    Shota Kawahara, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    2022 IEEE Energy Conversion Congress and Exposition (ECCE)   2022.10

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/ecce50734.2022.9948072

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  • Cross-Interference Free 6.78 MHz Multiple-Transmitter Using Power Factor Based Control for Wide-Area Wireless Power Transfer Systems

    Masataka Ishihara, Kodai Matsuura, Akihiro Konishi, Kazuhiro Umetani, Eiji Hiraki

    2022 IEEE Energy Conversion Congress and Exposition (ECCE)   2022.10

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    DOI: 10.1109/ecce50734.2022.9947525

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  • Analytical Derivation of Phase-Current Waveform for Elimination of Torque and Input-Current Ripples of Switched Reluctance Motor Operating Under Magnetic Saturation

    Takayuki Kusumi, Kosuke Kobayashi, Kazuhiro Umetani, Eiji Hiraki

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   58 ( 4 )   5248 - 5261   2022.7

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    DOI: 10.1109/TIA.2022.3172898

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  • High-Efficiency Solenoid Coil Structure for Induction Heating of Cylindrical Heating Object

    Daiki Miyake, Kazuhiro Umetani, Shota Kawahara, Masataka Ishihara, Eiji Hiraki

    IEEE International Symposium on Industrial Electronics   2022-June   307 - 313   2022

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ISIE51582.2022.9831459

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  • Secondary-Side Resonating LLC Converter for Reducing Transformer Voltage in High Power Applications

    Hayato Nakamura, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    2022 International Power Electronics Conference, IPEC-Himeji 2022-ECCE Asia   547 - 554   2022

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.23919/IPEC-Himeji2022-ECCE53331.2022.9806826

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  • Phase-Shift Based on Power Factor Control for LLC Converter with High Output Stability Against Load Fluctuation

    Kenta Yamada, Kazuhiro Umetani, Eiji Hiraki, Masataka Ishihara

    2022 IEEE 7th Southern Power Electronics Conference, SPEC 2022   2022

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/SPEC55080.2022.10058371

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  • A Secondary-Side Resonant LLC converter for Reducing Resonance Voltage with Boost Mode Operation Using Resonance Including Current Doubler Rectifier

    Hayato Nakamura, Naoyuki Yokoshima, Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki, Tatsuya Miyazaki, Yuta Okawauchi, Ken Nakahara

    2022 IEEE 7th Southern Power Electronics Conference, SPEC 2022   2022

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/SPEC55080.2022.10058227

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  • Sinusoidal-Flux Reluctance Machine Driven with Three-Phase Inverter for Improving Power Density with Reduced Torque and Input Current Ripples

    Masaki Iida, Kazuhiro Umetani, Takayuki Kusumi, Masataka Ishihara, Eiji Hiraki

    2021 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe   2021.9

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  • Autonomous System Concept of Multiple-Receiver Inductive Coupling Wireless Power Transfer for Output Power Stabilization against Cross-Interference among Receivers and Resonance Frequency Tolerance

    Masataka Ishihara, Keita Fujiki, Kazuhiro Umetani, Eiiji Hiraki

    IEEE Transactions on Industry Applications   57 ( 4 )   3898 - 3910   2021.7

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/TIA.2021.3081071

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  • Analytical Formulation of Copper Loss of Litz Wire With Multiple Levels of Twisting Using Measurable Parameters

    Kazuhiro Umetani, Shota Kawahara, Jesus Acero, Hector Sarnago, Oscar Lucia, Eiji Hiraki

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   57 ( 3 )   2407 - 2420   2021.5

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    DOI: 10.1109/TIA.2021.3063993

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  • Industrial Electronics Education: Past, Present, and Future Perspectives

    Oscar Lucia, Joao Martins, Yousef Ibrahim, Kazuhiro Umetani, Luis Gomes, Eiji Hiraki, Houcine Zeroug, Milos Manic

    IEEE INDUSTRIAL ELECTRONICS MAGAZINE   15 ( 1 )   140 - 154   2021.3

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    DOI: 10.1109/MIE.2020.3002488

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  • Feasibility of Sinusoidal Flux Drive Design of Reluctance Motor for Reducing Torque and Input Current Ripples with Three-Leg Inverter

    Masaki Iida, Takayuki Kusumi, Kazuhiro Umetani, Eiji Hiraki

    2021 IEEE 19TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (PEMC)   439 - 446   2021

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    DOI: 10.1109/PEMC48073.2021.9432579

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  • Parasitic Inductance Design for Preventing Oscillatory False Triggering of Parallel-Connected GaN-FETs.

    Yusuke Hatakenaka, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki, Hiroshi Tadano

    IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society(IECON)   1 - 8   2021

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/IECON48115.2021.9589541

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    Other Link: https://dblp.uni-trier.de/db/conf/iecon/iecon2021.html#HatakenakaUIHT21

  • Tiny Approaches to the Interactive Online Lectures Under the COVID-19 Pandemic.

    Eiji Hiraki, Masataka Ishihara, Kazuhiro Umetani

    IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society(IECON)   1 - 4   2021

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/IECON48115.2021.9589676

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    Other Link: https://dblp.uni-trier.de/db/conf/iecon/iecon2021.html#HirakiIU21

  • Feasibility of Parasitic Drain Inductance Design for Minimizing Switching Loss in Bridge Circuits Using GaN-FETs.

    Koki Abe, Masataka Ishihara, Yusuke Hatakenaka, Kazuhiro Umetani, Eiji Hiraki

    30th IEEE International Symposium on Industrial Electronics(ISIE)   1 - 5   2021

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/ISIE45552.2021.9576373

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    Other Link: https://dblp.uni-trier.de/db/conf/isie/isie2021.html#AbeIHUH21

  • A Control Method Based on Power Factor for Improving Output Voltage Stability and Efficiency of LLC Converter in Wide Range of Output Voltage and Load Impedance

    Kazuhiro Umetani, Kota Shimomura, Kenta Yamada, Taichi Kawakami, Masataka Ishihara, Eiji Hiraki

    2021 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3436 - 3443   2021

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    DOI: 10.1109/ECCE47101.2021.9595420

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  • Multiple-Transmitter with Phase-Shift and Dynamic ZVS Angle Controls at Fixed Operating Frequency for Cross-Interference Free Wireless Power Transfer Systems

    Kodai Matsuura, Masataka Ishihara, Akihiro Konishi, Kazuhiro Umetani, Eiji Hiraki

    2021 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   5767 - 5774   2021

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    DOI: 10.1109/ECCE47101.2021.9595950

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  • Autonomous Resonant Frequency Tuning Controller for Repeater Resonator in Resonant Inductive Coupling Wireless Power Transfer System

    Akihiro Konishi, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    PROCEEDINGS OF 2021 IEEE 30TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)   2021

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    DOI: 10.1109/ISIE45552.2021.9576268

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  • AC resistance Prediction of Litz Wire Planer Spiral Coil Based on Litz wire Loss Model

    S. Kawahara, K. Umetani, E. Hiraki

    23rd International Conference on Electrical Machines and Systems, ICEMS 2020   1541 - 1546   2020.11

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    DOI: 10.23919/ICEMS50442.2020.9290802

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  • Phase-current waveform for switched reluctance motors to eliminate input-current ripple and torque ripple in low-power propulsion below magnetic saturation

    Takayuki Kusumi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki

    IET POWER ELECTRONICS   13 ( 15 )   3351 - 3359   2020.11

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    DOI: 10.1049/iet-pel.2019.1207

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  • Simultaneous Tuning of Rotor Shape and Phase Current of Switched Reluctance Motors for Eliminating Input Current and Torque Ripples With Reduced Copper Loss

    Takayuki Kusumi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   56 ( 6 )   6384 - 6398   2020.11

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    DOI: 10.1109/TIA.2020.3015446

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  • Strategy of Topology Selection Based on Quasi-Duality Between Series-Series and Series-Parallel Topologies of Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    IEEE TRANSACTIONS ON POWER ELECTRONICS   35 ( 7 )   6785 - 6798   2020.7

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    DOI: 10.1109/TPEL.2019.2956732

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  • Effects of Secondary Leakage Inductance on the LLC Resonant Converter

    Mostafa Noah, Tomohide Shirakawa, Kazuhiro Umetani, Jun Imaoka, Masayoshi Yamamoto, Eiji Hiraki

    IEEE TRANSACTIONS ON POWER ELECTRONICS   35 ( 1 )   835 - 852   2020.1

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    DOI: 10.1109/TPEL.2019.2911093

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  • Competition-Based Learning of Power Converter Design Emulating Product Development Activity

    Kazuhiro Umetani, Eiji Hiraki

    IECON 2020: THE 46TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   3339 - 3344   2020

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  • Analysis and Prediction of AC Resistance of Litz Wire with Rectangular Cross-Section

    Shota Kawahara, Kazuhiro Umetani, Eiji Hiraki

    2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3273 - 3279   2020

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  • Multiple-Transmitter Achieving Load-Independent Transmitter Current and Compensation of Cross-Interference Among Transmitters for Wide Charging Area Wireless Power Transfer Systems

    Kodai Matsuura, Masataka Ishihara, Akihiro Konishi, Kazuhiro Umetani, Eiji Hiraki

    2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   5474 - 5481   2020

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  • Homogenization of Current Distribution in Parallel Connection of Interleaved Winding Layers of High-Frequency Transformers by Optimizing Distance between Winding Layers

    Ryo Murata, Tomohide Shirakawa, Kazuhiro Umetani, Eiji Hiraki, Hiroto Mizutani, Takaaki Takahara, Osamu Mori

    2020 22ND EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'20 ECCE EUROPE)   2020

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  • Optimization of Common Source Inductance and Gate-Drain Capacitance for Reducing Gate Voltage Fluctuation after Turn-off Transition

    Yusuke Hatakenaka, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3155 - 3162   2020

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  • Secondary-Side Center-Tapped Transformer Structure with One-Turn Secondary Coils Integrating Rectifier for Reducing Copper Loss of Forward Converter

    Tomohide Shirakawa, Kazuhiro Umetani, Eiji Hiraki, Wilmar Martinez

    2020 IEEE 29TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)   1459 - 1465   2020

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  • Receiving-coil structure reducing stray AC resistance for resonant coupling wireless power transfer

    Kazuhiro Umetani, Toru Honjo, Takahiro Koyama, Masataka Ishihara, Eiji Hiraki

    IET POWER ELECTRONICS   12 ( 9 )   2338 - 2344   2019.8

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    DOI: 10.1049/iet-pel.2018.5358

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  • Volume Reduction Effect of Thinly Extended Core Structure for Transformer in Isolated DC-DC Converter Reviewed

    R. Murata, T. Shirakawa, K. Umetani, E. Hiraki

    ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia   2132 - 2138   2019.5

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  • Prevention of Oscillatory False Triggering of GaN-FETs by Balancing Gate-Drain Capacitance and Common-Source Inductance

    Kazuhiro Umetani, Ryunosuke Matsumoto, Eiji Hiraki

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   55 ( 1 )   610 - 619   2019.1

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    DOI: 10.1109/TIA.2018.2868272

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  • Optimal Winding Layer Allocation for Minimizing Copper Loss of Secondary-Side Center-Tapped Forward Transformer with Parallel-Connected Secondary Windings

    Tomohide Shirakawa, Kazuhiro Umetani, Eiji Hiraki, Yuki Itoh, Takashi Hyodo

    2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   6206 - 6213   2019

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  • Automatic Active Compensation Method of Cross-Coupling in Multiple-receiver Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Keita Fujiki, Kazuhiro Umetani, Eiji Hiraki

    2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   4584 - 4591   2019

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  • Resonant Frequency Tuning System for Repeater Resonator of Resonant Inductive Coupling Wireless Power Transfer

    Akihiro Konishi, Keita Fujiki, Kazuhiro Umetani, Eiji Hiraki

    2019 21ST EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE '19 ECCE EUROPE)   2019

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  • Core Loss Modeling Based on Equivalent Circuit for Switched Reluctance Motors

    Takayuki Kusumi, Kosuke Kobayashi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki

    2019 IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT)   1743 - 1748   2019

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    DOI: 10.1109/ICIT.2019.8754931

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  • Analytical Derivation of Phase Current Waveform Eliminating Torque Ripple and Input Current Ripple of Switched Reluctance Motors under Magnetically Saturated Operation

    Takayuki Kusumi, Kosuke Kobayashi, Kazuhiro Umetani, Eiji Hiraki

    2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   6540 - 6547   2019

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  • Experimental Verification of Impedance Matching Method for Repeater to Improve Spatial Freedom of 6.78 MHz Resonant Inductive Coupling Wireless Power Transfer Systems

    Keita Fujiki, Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2019 21ST EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE '19 ECCE EUROPE)   2019

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  • Simple Fully Analytical Copper Loss Model of Litz Wire Made of Strands Twisted in Multiple Levels

    Kazuhiro Umetani, Jesus Acero, Hector Sarnago, Oscar Lucia, Eiji Hiraki

    THIRTY-FOURTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2019)   1257 - 1264   2019

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  • Effects of Secondary Leakage Inductance on the LLC Resonant Converter-Part I: Transformer Voltage Gain and Efficiency

    Mostafa Noah, Tomohide Shirakawa, Kazuhiro Umetani, Jun Imaoka, Masayoshi Yamamoto, Eiji Hiraki

    THIRTY-FOURTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2019)   780 - 786   2019

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  • Effects of Secondary Leakage Inductance on the LLC Resonant Converter-Part II: Frequency Control Bandwidth with respect to Load Variation

    Mostafa Noah, Tomohide Shirakawa, Kazuhiro Umetani, Jun Imaoka, Masayoshi Yamamoto, Eiji Hiraki

    THIRTY-FOURTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2019)   1408 - 1414   2019

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  • Axial Heating Coil Structure for Reducing Magnetic Levitation Force of All-Metal Type Induction Cookers

    Koki Kamaeguchi, Kazuhiro Umetani, Eiji Hiraki

    2019 8TH INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY RESEARCH AND APPLICATIONS (ICRERA 2019)   793 - 798   2019

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  • Verification of Device Model by Measuring Capacitance and Static Characteristics for Predicting Switching Waveform

    Kengo Koki, Masahiko Yoshioka, Kazuhiro Umetani, Eiji Hiraki

    2019 8TH INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY RESEARCH AND APPLICATIONS (ICRERA 2019)   786 - 792   2019

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  • High-frequency Self-Driven Synchronous Rectifier Controller for WPT Systems

    Akihiro Konishi, Kazuhiro Umetani, Eiji Hiraki

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)   1602 - 1609   2018

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  • Soft-Switching Control Circuit Based on Traveling and Reflected Waves for High -Frequency Resonant Inverter Applicable to Capacitive Load Impedance

    Aoi Oyane, Koji Itakura, Kazuhiro Umetani, Eiji Hiraki, Tatsuya Ikenari, Shingo Kawano

    IECON 2018 - 44TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   3051 - 3056   2018

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  • Extremum Co-Energy Principle for Analyzing AC Current Distribution in Parallel-Connected Wires of High-Frequency Power Inductors

    Tomohide Shirakawa, Genki Yamasaki, Kazuhiro Umetani, Eiji Hiraki

    IEEJ JOURNAL OF INDUSTRY APPLICATIONS   7 ( 1 )   35 - 42   2018

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    DOI: 10.1541/ieejjia.7.35

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  • Improved Thin Heating Coil Structure of Copper Foil Feasible for Induction Cookers

    Kazuhiro Umetani, Tomohiro Mishima, Eiji Hiraki, Takayuki Hirokawa, Makoto Imai, Hideki Sadakata

    IECON 2018 - 44TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   3503 - 3508   2018

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  • Design Optimization Method for the Load Impedance to Maximize the Output Power in Dual Transmitting Resonator Wireless Power Transfer System

    Takahiro Koyama, Kazuhiro Umetani, Eiji Hiraki

    IEEJ JOURNAL OF INDUSTRY APPLICATIONS   7 ( 1 )   49 - 55   2018

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    DOI: 10.1541/ieejjia.7.49

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  • Theoretical Derivation of Phase Current Profile for Switched Reluctance Motors to Suppress Radial Force Ripple and Torque Ripple

    Takayuki Kusumi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki

    2018 IEEE 27TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)   1037 - 1042   2018

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  • Rotor Configuration Which Reduces Copper Loss of Switched Reluctance Motors With Suppression of Torque Ripple and Input Current Ripple

    Takayuki Kusumi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki

    2018 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   6097 - 6103   2018

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  • Verification of the Reduction of the Copper Loss by the Thin Coil Structure for Induction Cookers

    Morimasa Hataya, Koki Kamaeguchi, Eiji Hiraki, Kazuhiro Umetani, Takayuki Hirokawa, Makoto Imai, Hideki Sadakata

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)   410 - 415   2018

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  • Feasibility Study of Fractal-Fin Heat Sink for Improving Cooling Performance of Switching Power Converters

    Shogo Ikegami, Kazuhiro Umetani, Eiji Hiraki, Satoshi Sakai, Satoshi Higashino

    2018 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)   2018

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  • Automatic Resonance Frequency Tuning Method for Repeater in Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)   1610 - 1616   2018

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  • Improving Robustness Against Variation in Resonance Frequency for Repeater of Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Shoma Ohata, Keita Fujiki, Kazuhiro Umetani, Eiji Hiraki

    2018 20TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'18 ECCE EUROPE)   2018

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  • Impedance Matching to Maximize Induced Current in Repeater of Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2018 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   6194 - 6201   2018

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  • Application of Automatic Resonant Frequency Tuning Circuit to Induction Heating System

    Koki Kamaeguchi, Kazuhiro Umetani, Eiji Hiraki

    2018 20TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'18 ECCE EUROPE)   2018

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  • Straightforward Measurement Method of Common Source Inductance for Fast Switching Semiconductor Devices Mounted on Board

    Kazuhiro Umetani, Kyota Aikawa, Eiji Hiraki

    IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS   64 ( 10 )   8258 - 8267   2017.10

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    DOI: 10.1109/TIE.2017.2694411

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  • Novel receiving coil structure for improving efficiency and power transfer capability of resonant inductive coupling wireless power transfer Reviewed

    T. Honjo, T. Koyama, K. Umetani, E. Hiraki

    19th International Conference on Electrical Machines and Systems, ICEMS 2016   2017.1

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  • Novel thin heating coil structure with reduced copper loss for high frequency induction cookers Reviewed

    M. Hataya, Y. Oka, K. Umetani, E. Hiraki, T. Hirokawa, M. Imai

    19th International Conference on Electrical Machines and Systems, ICEMS 2016   2017.1

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  • Optimization of the Balance between the Gate-Drain Capacitance and the Common Source Inductance for Preventing the Oscillatory False Triggering of Fast Switching GaN-FETs

    Rynosuke Matsumoto, Kazuhiro Umetani, Eiji Hiraki

    2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   405 - 412   2017

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  • An Investigation into a Slight-Variation of the Transformer Effective Permeability in LLC Resonant Converter

    Mostafa Noah, Shun Endo, Shota Kimura, Masayoshi Yamamoto, Jun Imaoka, Kazuhiro Umetani, Eiji Hiraki

    2017 19TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'17 ECCE EUROPE)   2017

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  • Compact Three-Phase AC Inductor Network for PFC Converter Using Magnetic Coupled Technique

    Takuya Ozaki, Hiroki Nakaido, Kazuhiro Umetani, Eiji Hiraki, Tatsuya Ikenari, Shingo Kawano

    IECON 2017 - 43RD ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   958 - 963   2017

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  • Application of Extremum Co-Energy Principle for Homogenizing Current Distribution in Parallel-Connected Windings in Transformers: Design Optimization of Winding Turn Allocation among Winding Layers

    Tomohide Shirakawa, Kazuhiro Umetani, Eiji Hiraki

    2017 19TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'17 ECCE EUROPE)   2017

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  • Analytical Investigation on Design Instruction to Avoid Oscillatory False Triggering of Fast Switching SiC-MOSFETs

    Yusuke Sugihara, Kimihiro Nanamori, Seiya Ishiwaki, Yuma Hayashi, Kyota Aikawa, Kazuhiro Umetani, Eiji Hiraki, Masayoshi Yamamoto

    2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   5113 - 5118   2017

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  • Evaluation of Impact of Parasitic Magnetic Coupling in PCB Layout on Common Source Inductance of Surface Mounted Package

    Ryunosuke Matsumoto, Kyota Aikawa, Akihiro Konishi, Kazuhiro Umetami, Eiji Hiraki

    2017 IEEE 12TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS (PEDS)   559 - 566   2017

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  • Measurement of the Common Source Inductance of Typical Switching Device Packages

    Kyota Aikawa, Tomohumi Shiida, Ryunosuke Matsumoto, Kazuhiro Umetani, Eiji Hiraki

    2017 IEEE 3RD INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE AND ECCE ASIA (IFEEC 2017-ECCE ASIA)   1172 - 1177   2017

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  • Elucidation of Quasi-Duality between Series-Series and Series-Parallel Topologies of Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2017 IEEE 12TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS (PEDS)   674 - 679   2017

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  • Soft-switching Technique Applicable to Capacitive Load for Resonant Inverter of Plasma Generator

    Koji Itakura, Hiroaki Kakemizu, Hiroki Nakaido, Kazuhiro Umetani, Eiji Hiraki, Tatsuya Ikenari, Shingo Kawano

    IECON 2017 - 43RD ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   1556 - 1562   2017

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  • Simple Self-Driven Synchronous Rectifier for Resonant Inductive Coupling Wireless Power Transfer

    Takahiro Koyama, Toru Honjo, Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2017 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)   363 - 368   2017

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  • Simple Analytical Derivation of Magnetic Flux Profile Eliminating Source Current Ripple and Torque Ripple of Switched Reluctance Motors for Electric Vehicle Propulsion

    Takayuki Kusumi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki

    2017 THIRTY SECOND ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC)   3142 - 3149   2017

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  • Quasi-duality between SS and SP topologies of basic electric-field coupling wireless power transfer system

    M. Ishihara, K. Umetani, H. Umegami, E. Hiraki, M. Yamamoto

    Electronics Letters   52 ( 25 )   2057 - 2059   2016.12

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    DOI: 10.1049/el.2016.1253

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  • A design guideline of parasitic inductance for preventing oscillatory false triggering of fast switching GaN-FET

    Kazuhiro Umetani, Keisuke Yagyu, Eiji Hiraki

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   11   S84 - S90   2016.12

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    DOI: 10.1002/tee.22339

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  • A Simple Behavior Model for Switched Reluctance Motors Based on Magnetic Energy

    Takuto Hara, Takayuki Kusumi, Kazuhiro Umetani, Eiji Hiraki

    2016 IEEE 8TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (IPEMC-ECCE ASIA)   109 - 115   2016

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  • Lagrangian Derivation and Analysis of a Simple Equivalent Circuit Model of Wireless Power Transfer System with Dual Transmitting Resonators

    Takahiro Koyama, Toru Honjo, Kazuhiro Umetani, Eiji Hiraki

    2016 18TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'16 ECCE EUROPE)   2016

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  • Simple Control Technique to Eliminate Source Current Ripple and Torque Ripple of Switched Reluctance Motors for Electric Vehicle Propulsion

    Takayuki Kusumi, Takuto Hara, Kazuhiro Umetani, Eiji Hiraki

    PROCEEDINGS OF THE IECON 2016 - 42ND ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   1876 - 1881   2016

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  • Copper Loss Analysis Based on Extremum Co-Energy Priciple for High Frequency Forward Transformers with Parallel-Connected Windings

    Tomohide Shirakawa, Genki Yamasaki, Kazuhiro Umetani, Eiji Hiraki

    PROCEEDINGS OF THE IECON 2016 - 42ND ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   1099 - 1105   2016

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  • Simple flux-based Lagrangian formulation to model nonlinearity of concentrated-winding switched reluctance motors Reviewed

    K. Umetani, M. Yamamoto, E. Hiraki

    Electronics Letters   51 ( 24 )   1984 - 1986   2015.11

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    DOI: 10.1049/el.2015.0950

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  • Lagrangian-based Equivalent Circuit of Basic Electric-Field Coupling Wireless Power Transfer System

    Hirokatsu Umegami, Kazuhiro Umetani, Masayoshi Yamamoto, Eiji Hiraki

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   10   S168 - S170   2015.10

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    DOI: 10.1002/tee.22180

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  • Novel Simple Reactive Power Control Strategy With DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

    Tint Soe Win, Yoshihiro Hisada, Toshihiko Tanaka, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   51 ( 5 )   4091 - 4099   2015.9

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    DOI: 10.1109/TIA.2015.2437972

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  • Experimental Validation of Normally-On GaN HEMT and Its Gate Drive Circuit

    Takaharu Ishibashi, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Tamotsu Hashizume, Daigo Kikuta, Tetsu Kachi

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   51 ( 3 )   2415 - 2422   2015.5

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    DOI: 10.1109/TIA.2014.2369818

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  • Reduced-Capacity Smart Charger for Electric Vehicles on Single-Phase Three-Wire Distribution Feeders With Reactive Power Control

    Hidenori Tanaka, Toshihiko Tanaka, Takaaki Wakimoto, Eiji Hiraki, Masayuki Okamoto

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   51 ( 1 )   315 - 324   2015.1

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    DOI: 10.1109/TIA.2014.2327156

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  • Non-isolated Interleaved High Step-up Converter with Reduced Voltage Multiplier Stages and a Regenerative Turn-off Snubber

    Kazuhiro Umetani, Eiji Hiraki, Masayoshi Yamamoto

    2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   125 - 132   2015

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  • Lagrangian-Based Derivation of a Novel Sliding-Mode Control for Synchronous Buck Converters

    Kazuhiro Umetani, Masayoshi Yamamoto, Eiji Hiraki

    IEEJ JOURNAL OF INDUSTRY APPLICATIONS   4 ( 6 )   728 - 729   2015

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    DOI: 10.1541/ieejjia.4.728

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  • Passive Regenerative Turn-off Snubber Composed of Two Diodes and a Capacitor for Two-Phase Interleaved Boost Chopper

    Kazuhiro Umetani, Eiji Hiraki, Masayoshi Yamamoto

    2015 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)   2015

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  • Reactive Power Control Strategy Based on DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

    Tint Soe Win, Toshihiko Tanaka, Masayuki Okamoto, Yoshihiro Hisada, Eiji Hiraki, Seong Ryong Lee

    IEEJ JOURNAL OF INDUSTRY APPLICATIONS   4 ( 3 )   158 - 165   2015

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    DOI: 10.1541/ieejjia.4.158

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  • High-frequency Induction Heating for Tiny Foreign Metals

    Shinya Kurachi, Naoki Yamamoto, Hiroaki Yamada, Toshihiko Tanaka, Eiji Hiraki, Yukiharu Yamada, Tatsuya Nagao, Yasuhiro Miyake, Yujiro Noda

    2015 9TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND ECCE ASIA (ICPE-ECCE ASIA)   2203 - 2208   2015

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  • Peak Power Shaving of an Electric Injection Molding Machine With Supercapacitors

    Hirofumi Akiyoshi, Eiji Hiraki, Toshihiko Tanaka, Masayuki Okamoto, Tadayoshi Matsuo, Kiyoshi Ochi

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   50 ( 2 )   1114 - 1120   2014.3

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    DOI: 10.1109/TIA.2013.2272433

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  • MHz-class High-frequency Soft-switching GaN-based Inverter for Wireless Power Transmission via Electromagnetic Resonance

    Keisuke Yoshizawa, Toshihiko Tanaka, Eiji Hiraki, Masayuki Okamoto

    2014 INTERNATIONAL ELECTRONICS AND APPLICATION CONFERENCE AND EXPOSITION (PEAC)   451 - 455   2014

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  • A High-Frequency Link AC-AC Converter for Contactless Power Supply System in Parking Tower

    Kawano Shingo, Hiraki Eiji, Tanaka Toshihiko, Okamoto Masayuki

    IEEJ Transactions on Industry Applications   134 ( 2 )   139 - 146   2014

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    This paper proposes a new concept for a contactless power supply system (CPS) in a mechanical multi-level parking tower for plug-in hybrid vehicles (PHVs) and electric vehicles (EVs). In recent years, PHVs and EVs have been commercialized as low environmental impact vehicles, and the demand for such vehicles is spreading rapidly. To cater to this increasing demand of PHVs and EVs, battery charging systems in the parking tower are necessary. Most multi-level parking towers have movable parking pallets that are electrically isolated from the building side. Because of the poor positional accuracy of the movable pallets, a contactless power transmission system between the utility grid in the building and the movable pallet is necessary. As for the CPS in the parking tower, a power conversion stage from commercial AC to high-frequency AC is necessary for size reduction. In general, such a power conversion system consists of power factor correction (PFC) converters and high-frequency inverters. Therefore, two or more conversion stages are necessary, which increases the power losses and cost. In this paper, a simple circuit configuration of a high-frequency link AC-AC converter for a CPS in a parking tower is proposed. The proposed high-frequency link AC-AC converter can directly convert commercial AC to high-frequency AC (HFAC) and HFAC to commercial AC again. Experiments are performed to demonstrate the validity of the proposed CPS. The proposed CPS is found to have a coupling coefficient of 0.75 for a contact-less transformer with a 10mm gap, and an efficiency of 86% can be achieved.

    DOI: 10.1541/ieejias.134.139

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  • Multiple-Output High-Frequency Inverter for IH Cooking Appliances

    Hirokawa Takayuki, Hiraki Eiji, Tanaka Toshihiko, Imai Makoto, Yasui Kenji, Sumiyoshi Shinichiro

    IEEJ Transactions on Industry Applications   134 ( 4 )   477 - 478   2014

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    In this paper, a multiple-output high-frequency soft switching inverter is presented for home and business-use of IH cooking appliances. The proposed inverter is composed of parallel-connected single-switched multiresonant inverter cells. A detailed analysis indicates that the proposed inverter can control multiple-output power independently through a phase-shifted PWM scheme. The experimental results suggest that the prototype may be applied to multiple-output induction heating appliances.

    DOI: 10.1541/ieejias.134.477

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  • Reactive Power Control without Load-Side Power Calculation for Smart Charger of Electric Vehicles on Single-Phase Three-Wire Distribution Feeders

    Tanaka Hidenori, Tanaka Toshihiko, Okamoto Masayuki, Hiraki Eiji

    Journal of the Japan Institute of Power Electronics   40   63 - 69   2014

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    This paper proposes a novel reactive power control algorithm without load-side active power calculation for the previously proposed smart charger of Electric Vehicles (EVs) on single-phase three-wire distribution feeders. The basic principle of the proposed reactive power control algorithm is discussed in detail and then confirmed by digital computer simulation using PSIM software. A prototype experimental model is constructed and tested. Experimental results demonstrate that balanced source currents with a power factor of 0.9, which is acceptable value in Japanese regulation, are obtained on the secondary side of the pole-mounted distribution transformer during the battery charging operation.

    DOI: 10.5416/jipe.40.63

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  • Novel, Simple Reactive Power Control Strategy with DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

    Tint Soe Win, Yoshihiro Hisada, Toshihiko Tanaka, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee

    2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3916 - 3921   2014

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  • Reactive Power Control Strategy Based on DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

    Tint Soe Win, Yoshihiro Hisada, Toshihiko Tanaka, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee

    2014 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIROSHIMA 2014 - ECCE-ASIA)   3292 - 3297   2014

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  • Novel control algorithm for active load balancer in three-phase four-wire distribution systems Reviewed

    Tint Soe Win, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee, Toshihiko Tanaka

    IEEJ Journal of Industry Applications   3 ( 3 )   286 - 287   2014

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    DOI: 10.1541/ieejjia.3.286

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  • Reducing capacity of smart charger for electric vehicles on single-phase three-wire distribution feeders with reactive power control Reviewed

    Hidenori Tanaka, Takaaki Wakimoto, Toshihiko Tanaka, Masayuki Okamoto, Eiji Hiraki

    IEEJ Journal of Industry Applications   3 ( 6 )   437 - 445   2014

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    DOI: 10.1541/ieejjia.3.437

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  • A Novel Active Power Quality Compensator Topology with DC Voltage Balancer for Electrified Railways

    Tint Soe Win, Eiji Hiraki, Toshihiko Tanaka

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   8 ( 6 )   634 - 639   2013.11

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    DOI: 10.1002/tee.21907

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  • Smart Charger for Electric Vehicles With Power-Quality Compensator on Single-Phase Three-Wire Distribution Feeders

    Toshihiko Tanaka, Tsukasa Sekiya, Hidenori Tanaka, Masayuki Okamoto, Eiji Hiraki

    IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS   49 ( 6 )   2628 - 2635   2013.11

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    DOI: 10.1109/TIA.2013.2262915

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  • A Time-Sharing High-Frequency Inverter for All Metal IH Cooking Appliances

    HIROKAWA Takayuki, HIRAKI Eiji, TANAKA Toshihiko, OKAMOTO Masayuki, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   133 ( 7 )   692 - 699   2013.7

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    In recent years, induction heating (IH) cookers using a high-frequency (HF) inverter for home use have become increasingly popular because of their cleanliness, high efficiency, safety, and so on. With regard to the domestic consumer markets, effective applicability to a variety of pan materials such as low resistivity materials (aluminum and copper) and high-resistivity materials (iron and magnetic stainless steel) is one of the important issues. In this paper, a time-sharing HF inverter for IH cooking appliances that enables doubling of the output frequency of the switching operation is proposed. The proposed HF resonant inverter is able to reduce switching losses by the frequency doubler and the soft-switching operation. Furthermore, the current rating of the switching power devices is reduced because of the parallel-connected circuit configuration. The basic principle of the proposed time-sharing HF inverter is discussed in detail. The performance and effectiveness of the proposed time-sharing HF inverter are confirmed by experimental point of view.

    DOI: 10.1541/ieejias.133.692

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  • Reduced-Capacity Smart Charger for Electric Vehicles on Single-Phase Three-Wire Distribution Feeders with Reactive Power Control

    Hidenori Tanaka, Toshihiko Tanaka, Takaaki Wakimoto, Eiji Hiraki, Masayuki Okamoto

    2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   5158 - 5164   2013

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  • Resonant Gate Driver for Normally-On GaN High-Electron-Mobility Transistor

    Takaharu Ishibashi, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Tamotsu Hashizume, Tetsu Kachi

    2013 IEEE ECCE ASIA DOWNUNDER (ECCE ASIA)   365 - 371   2013

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  • Experimental Validation of Newly Fabricated Normally-On GaN High-Electron-Mobility Transistor

    Takaharu Ishibashi, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Tamotsu Hashizume, Daigo Kikuta, Tetsu Kachi

    2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   1584 - 1591   2013

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  • Sepic と Zeta コンバータの特性評価

    中本 貴之, 廣川 貴之, 平木 英治, 岡本 昌幸, 田中 俊彦

    パワーエレクトロニクス学会誌   39   188 - 188   2013

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    DOI: 10.5416/jipe.39.188

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  • A New Current Control Strategy Based on the Internal Model Principle for a Current Balancer in Single-Phase Three-Wire Distribution Systems

    Yusuke Baba, Yuji Wakasa, Eiji Hiraki, Toshihiko Tanaka, Masayuki Okamoto, Seong Ryong Lee

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   8   S95 - S101   2013

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    DOI: 10.1002/tee.21924

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  • Dual-Frequency Multiple-Output Resonant Soft-Switching Inverter for Induction Heating Cooking Appliances

    Takayuki Hirokawa, Eiji Hiraki, Toshihiko Tanaka, Makoto Imai, Kenji Yasui, Shinichiro Sumiyoshi

    39TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2013)   5028 - 5033   2013

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  • Ubiquitous Power for Sectional Compact Emergency Shelter

    Toshihiko Tanaka, Keiichi Kato, Shinichi Noriyasu, Eiji Hiraki, Makoto Koganei, Fusanori Miura, Masayuki Okamoto

    2013 IEEE ECCE ASIA DOWNUNDER (ECCE ASIA)   404 - 408   2013

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  • Constant DC Capacitor Voltage Control Based Strategy for Active Load Balancer in Three-phase Four-wire Distribution System

    Tint Soe Win, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee, Toshihiko Tanaka

    2013 INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS)   1560 - 1565   2013

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  • A Study on GaN Inverter Based MHz Frequency Induction Heating for Tiny Metals

    Naoki Yamamoto, Eiji Hiraki, Toshihiko Tanaka, Yukiharu Yamada, Tatsuya Nagao, Yasuhiro Miyake

    39TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2013)   5023 - 5027   2013

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  • A Large-Capacity Capacitor Simulator with an Inner-Series Resistor

    Okamoto Masayuki, Hiraki Eiji, Tanaka Toshihiko, Tanaka Atsushi

    IEEJ Journal IA   2 ( 4 )   204 - 210   2013

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    This paper proposes a universal large-capacity capacitor simulator. The proposed simulator consists of a main chemical capacitor and three-leg IGBTs. One leg of the IGBTs acts as a bidirectional dc-dc converter. The other two legs are used for a single-phase PWM rectifier. In the capacitor-charging operation, the bidirectional dc-dc converter is used as a boost converter. Most of the power supplied by the load is supplied to the utility through the single-phase PWM rectifier. In the capacitor-discharging operation, the bidirectional dc-dc converter acts as a buck converter. Most of the power supplied to the load is from the utility through the single-phase PWM rectifier. A new control method, which can perform as an inner-series resistor in a supercapacitor (SC), is also proposed for an SC simulator. The basic principle of the proposed capacitor simulator is discussed in detail. The validity and high applicability of the proposed large-capacity capacitor simulator are confirmed using PSIM software. A prototype experimental model is constructed and tested. The experimental results demonstrate that the proposed capacitor simulator acts both as an ideal large-capacity capacitor and as an SC with an inner-series resistor.

    DOI: 10.1541/ieejjia.2.204

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  • A starting method of the harmonic current compensator using a hybrid active filter for wind power generation systems with soft starters

    Hiroaki Yamada, Eiji Hiraki, Toshihiko Tanaka

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   7   S139 - S145   2012.12

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    DOI: 10.1002/tee.21815

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  • Topology for Current Balancer with Half-Bridge Inverters in Single-Phase Three-Wire Distribution Systems with DC-Capacitor-Voltage Balancer

    Yusuke Baba, Kazuya Sugahara, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka

    ELECTRICAL ENGINEERING IN JAPAN   180 ( 4 )   38 - 46   2012.9

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    DOI: 10.1002/eej.22277

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  • A Study on Small-Sized Time-Sharing High-Frequency Resonant Soft-Switching Inverter for IH Cooking Appliances

    HIROKAWA Takayuki, HIRAKI Eiji, TANAKA Toshihiko, OKAMOTO Masayuki

    Technical report of IEICE. Energy engineering in electronics and communications   2012 ( 96 )   81 - 85   2012.7

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    We have been proposed the time-sharing high-frequency resonant soft-switching inverter for IH cooking appliances which is composed of two single-IGBT multiple-resonant inverter cells. Until now, the proposed inverter has been feasibly evaluated by the experimental point of view. In this paper, possibility of the minimization of the circuit volume by coupling of two inductors is discussed from theoretical way.

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  • A Constant DC-Capacitor Voltage Control Based Strategy for Current Balancer in Single-Phase Three-Wire Distribution Systems

    BABA Yusuke, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko, LEE Seong Ryong

    IEEJ Transactions on Industry Applications   132 ( 5 )   581 - 587   2012.5

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    This paper proposes a strategy based on constant dc-capacitor voltage control for a current balancer in single-phase three-wire distribution systems. The proposed control strategy involves the use of only the constant dc-capacitor voltage control block commonly used in active power conditioners for the calculation of the compensation current. No calculation block is required to obtain the reactive and unbalanced-active components. Thus, we provide the simplest possible control strategy for the current balancer. The basic principle of the proposed control method is discussed in detail and its validity, which is confirmed by a digital computer simulation using PSIM software, is shown. A prototype experimental model is constructed and tested. Experimental results demonstrate that balanced source currents with a power factor of unity are obtained on the secondary side of a pole-mounted distribution transformer while unbalanced load current conditions with a lagging power factor are retained.

    DOI: 10.1541/ieejias.132.581

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  • A constant DC voltage control-based strategy for an active power quality compensator in electrified railways with improved response

    Norio Ishikura, Keisuke Ishibashi, Eiji Hiraki, Toshihiko Tanaka

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   7 ( 3 )   316 - 321   2012.5

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    DOI: 10.1002/tee.21733

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  • A Practical Evaluation of a Time-Sharing High-Frequency Inverter with Coupled Inductor for IH Cooking Appliances

    Hirokawa Takayuki, Hiraki Eiji, Tanaka Toshihiko, Okamoto Masayuki

    Journal of the Japan Institute of Power Electronics   38   141 - 148   2012

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    This paper represents the practical evaluations of an improved time-sharing high-frequency resonant soft-switching inverter for all metal induction heating (IH) cooking appliances. By introducing inductor coupling technology, the number of the circuit components and a physical volume of the circuit can be reduced. A design procedure of the coupling inductor is discussed in detail. Furthermore, two IH power regulation sequences; phase shifted PWM and PAM are compared to the viewpoint of the power conversion efficiency.

    DOI: 10.5416/jipe.38.141

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  • Performance Analysis for High-Frequency link AC-AC Contact-less Power Supply System in Parking Tower

    Shingo Kawano, Eiji Hiraki, Toshihiko Tanaka, Masayuki Okamoto

    38TH ANNUAL CONFERENCE ON IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2012)   645 - 650   2012

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  • Smart Charger for Electric Vehicles with Power Quality Compensator on Single-Phase Three-Wire Distribution Feeders

    Toshihiko Tanaka, Tsukasa Sekiya, Hidenori Tanaka, Eiji Hiraki, Masayuki Okamoto

    2012 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3075 - 3081   2012

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  • Peak Power Shaving of an Electric Injection Molding Machine with Supercapacitors

    Hirofumi Akiyoshi, Eiji Hiraki, Toshihiko Tanaka, Masayuki Okamoto, Tadayoshi Matsuo Eiji Hiraki, Kiyoshi Ochi

    2012 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   2590 - 2595   2012

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  • High Frequency-link AC-AC Wire-less Power Supply System in Parking Tower

    Eiji Hiraki, Shingo Kawano, Toshihiko Tanaka, Masayuki Okamoto

    2012 15TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (EPE/PEMC)   2012

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  • The Practical Evaluations of Time-Sharing High-Frequency Resonant Soft-Switching Inverter for All Metal IH Cooking Appliances

    Takayuki Hirokawa, Eiji Hiraki, Toshihiko Tanaka, Masayuki Okamoto, Mutsuo Nakaoka

    38TH ANNUAL CONFERENCE ON IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2012)   3302 - 3307   2012

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  • Topology for Current Balancer with Half-Bridge Inverters in Single-Phase Three-Wire Distribution Systems with DC-Capacitor-Voltage Balancer

    BABA Yusuke, SUGAHARA Kazuya, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   131 ( 7 )   880 - 887   2011.7

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    This paper proposes a new topology for a current balancer with half-bridge inverters in single-phase three-wire distribution systems with a three-leg inverter. Two half-bridge inverters are connected to the sources. The midpoint of two capacitors on the DC-side is connected to a neutral line. The two half-bridge inverters perform a current balancer for single-phase three-wire distribution systems by exchanging the active and reactive power on the each feeder through the two DC-capacitors. The third-leg performs a DC-capacitor-voltage balancer for the two DC-capacitors connected to the half-bridge inverters. Thus, balanced source voltages and currents are obtained on the secondary-side on the pole-mounted distribution transformer with balanced DC-capacitor voltages. The basic principle of the proposed current balancer is discussed in detail, and then, confirmed by digital computer simulation using PSIM software. A prototype experimental model is constructed and tested. Experimental results show that balanced source voltages and currents are obtained on the secondary-side on the pole-mounted distribution transformer with balanced DC-capacitor voltages.

    DOI: 10.1541/ieejias.131.880

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  • A Large-Capacity Capacitor Simulator with an Inner-Series Resistor

    Toshihiko Tanaka, Atsushi Tanaka, Masayuki Okamoto, Eiji Hiraki

    IECON 2011: 37TH ANNUAL CONFERENCE ON IEEE INDUSTRIAL ELECTRONICS SOCIETY   1052 - 1057   2011

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  • GaNデバイス用高速ドライブ回路の開発

    石橋卓治, 岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   62nd   2011

  • A Novel Type Time-Sharing High-Frequency Resonant Soft-Switching Inverter for All Metal IH Cooking Appliances

    Takayuki Hirokawa, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka

    IECON 2011: 37TH ANNUAL CONFERENCE ON IEEE INDUSTRIAL ELECTRONICS SOCIETY   2526 - 2532   2011

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  • Loss Evaluation of an AC-AC Direct Converter with a New GaN HEMT SPICE Model

    Masayuki Okamoto, Genki Toyoda, Eiji Hiraki, Toshihiko Tanaka, Tamotsu Hashizume, Tetsu Kachi

    2011 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   1795 - 1800   2011

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  • 直流電圧一定制御を用いた単相三線式配電用電流バランサの制御法

    馬場 雄介, 福井 博一, 岡本 昌幸, 平木 英治, 田中 俊彦

    パワーエレクトロニクス学会誌   36 ( 36 )   168 - 168   2011

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    DOI: 10.5416/jipe.36.168

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  • 非接触給電用高周波電力変換回路のシミュレーション評価

    河野 真吾, 岡本 昌幸, 平木 英治, 田中 俊彦

    パワーエレクトロニクス学会誌   36 ( 36 )   187 - 187   2011

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    DOI: 10.5416/jipe.36.187

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  • 直列抵抗を模擬可能な大容量キャパシタシミュレータ

    田中 敦士, 岡本 昌幸, 平木 英治, 田中 俊彦

    パワーエレクトロニクス学会誌   36 ( 36 )   190 - 190   2011

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    DOI: 10.5416/jipe.36.190

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  • A Half-Bridge Inverter Based Current Balancer with the Reduced DC Capacitors in Single-Phase Three-Wire Distribution Feeders

    Yusuke Baba, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka

    2011 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   4233 - 4239   2011

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  • High Frequency link AC-AC converter for non-contact power supply system in parking tower

    KAWANO Shingo, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko

    Technical report of IEICE. Energy engineering in electronics and communications   2011 ( 305(EE2011 24-30) )   7 - 12   2011

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    In tandem with the penetration of EV, PHV, non-contact power supply system in parking towers have become important subjects. In parking towers, EV and PHV are charged on the traveling pallets, supply power is to be transmitted from the building to travelling pallets. In this paper, high frequency link AC-AC converter for non-contact power supply system in parking tower is newly proposed and its performance have been demonstrated from computer aided simulation and experiment.

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  • Conference Report : The 36th Annual Conference of the IEEE Industrial Electronics Society (IECON2010) November 7 - 10, 2010, Glendale, USA

    IEEJ Transactions on Industry Applications   131 ( 3 )   NL3_4   2011

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    DOI: 10.1541/ieejias.131.NL3_4

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  • A feasible evaluation of a charge boost type two output full bride inverter for IH cooking appliance

    Zenitani Shin, Okamoto Masayuki, Hiraki Eiji, Tanaka Toshihiko, Sadakata Hideki, Fujita Atsushi, Nakaoka Mutuo

    Journal of the Japan Institute of Power Electronics   36 ( 36 )   103 - 109   2011

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    In this paper, a multi output high frequency soft switching inverter topology is presented for home use IH cooking appliances. The proposed inverter system is comprised of simple power circuitry and unique control scheme. The detailed analysis shows that the proposed inverter has low harmonic distortion, low switching losses and wide output powerrange. A detailed PWM procedure is illustrated as well. Through simulation and experimental results, the proposed IH system is verified.

    DOI: 10.5416/jipe.36.103

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  • 電気自動車用スマートチャージャ

    田中秀典, 関谷司, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   62nd   2011

  • マルチレベルインバータを用いた無効電力補償装置

    伊藤北斗, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   62nd   2011

  • 高周波ソフトスイッチングハーフブリッジインバータにおける寄生インダクタンスを考慮した動作解析

    松井光生, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   62nd   2011

  • 高い降圧比を有するインダクタ結合形DC-DCコンバータの損失分析

    渡辺潤, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   62nd   2011

  • A half-bridge inverter based active power quality compensator with a DC voltage balancer for electrified railways

    Tint Soe Win, Yusuke Baba, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka

    Proceedings of the International Conference on Power Electronics and Drive Systems   185 - 190   2011

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    DOI: 10.1109/PEDS.2011.6147244

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  • Control strategies of active power line conditioners in single-phase circuits

    Toshihiko Tanaka, Masayuki Okamoto, Eiji Hiraki

    8th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2011-ECCE Asia   1813 - 1820   2011

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    DOI: 10.1109/ICPE.2011.5944516

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  • An isolated bi-directional soft switching DC-DC converter for energy storage system and its voltage stress suppression approach

    Kazumasa Hirao, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka

    Proceedings of the International Conference on Power Electronics and Drive Systems   555 - 560   2011

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    DOI: 10.1109/PEDS.2011.6147304

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  • A ubiquitous power with DC micro-grid for sctional compact emergency shelters

    Keiichi Kato, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Makoto Koganei, Fusanori Miura

    Proceedings of the International Conference on Power Electronics and Drive Systems   436 - 440   2011

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    DOI: 10.1109/PEDS.2011.6147285

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  • A New Control Method of a Large-Capacity Capacitor Simulator with an Inner Series Resistor

    TANAKA Atsushi, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   130 ( 10 )   1189 - 1190   2010.10

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    This paper proposes a new control method for the previously proposed large-capacity capacitor simulator, which can perform an inner series resistor of the EDLCs. In the proposed large-capacity capacitor simulator, one of three legs performs a bi-directional dc-dc converter. The others are used for a single-phase PWM rectifier. In the charging operation of the proposed large-capacity simulator, one-leg is used as a boost converter. Most power, which is stored in the proposed simulator, is injected to the utility through the PWM rectifier. In the discharging operation, the one-leg performs a buck converter. Most power, which is supplied to the load, is from the utility through the PWM rectifier. Thus the proposed simulator performs a large-capacity capacitor with an inner resistor in both charging and discharging operations. The basic principle of the proposed simulator is discussed in detail. The validity and excellent practicability of the proposed control method for the large-capacity capacitor simulator are confirmed using PSIM software.

    DOI: 10.1541/ieejias.130.1189

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  • Basic analysis of an isolated bi-directional DC-DC converter

    HIRAO Kazumasa, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko

    IEICE technical report   110 ( 151 )   23 - 28   2010.7

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  • A Constant DC Voltage Control Based Strategy for the Current Balancer in Single-Phase Three-Wire Secondary Distribution Systems

    FUKUI Hirokazu, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   130 ( 7 )   935 - 936   2010.7

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    This paper deals with applying the constant dc voltage control based algorithm to the current balancer in single-phase three-wire secondary distribution systems. The power flows into a three-leg inverter, which performs the current balancer, are discussed, and then we show that only the reactive power flows into the three-leg inverter. This demonstrates that the required-capacity of the dc capacitor can be reduced as compared to that of the active power quality compensator used in the electrified railways. This reduced-capacity dc capacitor results in the rapid and stable balancing. The basic principle of the proposed method is discussed in detail, and then confirmed by digital computer simulation. Digital computer simulation results demonstrate that the balanced source currents with unity power factor are obtained remaining the unbalanced load currents conditions.

    DOI: 10.1541/ieejias.130.935

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  • Practical Evaluations of a Novel Asymmetrical ZCS-PWM DC-DC Converter with High-Frequency Transformer-Link

    MISHIMA Tomokazu, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   130 ( 5 )   605 - 613   2010.5

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    This paper presents a novel Zero Current Switching (ZCS)-PWM controlled half-bridge DC-DC converter with High-Frequency (HF)-link. The newly-proposed soft switching DC-DC converter consists of a multi-resonant half-bridge HF-isolated inverter controlled by an asymmetrical PWM scheme and a center-tapped diode rectifier with a choke input filter. In order to attain the wide range of soft-commutation under the condition of constant switching frequency, the single Active Edge-Resonant Cell (AERC) that is composed of a lossless inductor and a switched resonant capacitor is originally employed for the half-bridge inverter arm, providing and assisting ZCS operations in the switching power devices. The ZCS-PWMDC-DC converter treated here is evaluated in experiments using the 800 W-55 kHz prototype. The practical effectiveness of the proposed soft switching DC-DC converter is actually demonstrated and discussed with the experimental results under open loop and closed loop configurations. Finally, the feasibility of the DC-DC converter topology is discussed from the view points of the high efficiency and high power density.

    DOI: 10.1541/ieejias.130.605

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  • A New Starting Method of the Hybrid Power Filter for Wind Power Generation Systems with Soft Starter

    YAMADA Hiroaki, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   130 ( 4 )   574 - 575   2010.4

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    This paper proposes a new method of starting the hybrid power filter for wind power generation systems with soft starter. In the proposed method, an active filter of the hybrid power filter behaves a resistor for the source current under the starting condition. Thus the inrush phenomena of the passive filter are perfectly suppressed. The basic principle of the proposed starting method is discussed, and then confirmed by digital computer simulation using PSCAD/EMTDC. Simulation results demonstrate that the proposed starting method can overcome the inrush currents for the passive filter, building up the dc voltage of the active filter.

    DOI: 10.1541/ieejias.130.574

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  • Two-Stage Soft-Switching High-Frequency Inverter with Simple PFC Function for Consumer IH Cooking Appliances

    KAWAGUCHI Yuki, HIRAKI Eiji, TANAKA Toshihiko, SADAKATA Hideki, FUJITA Atsushi, OMORI Hideki, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   130 ( 4 )   450 - 458   2010.4

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    In recent years, consumer induction-heating (IH) cooking appliances have grown increasingly popular because of their easy cleaning, high efficiency, safety, and controllability. IH food cooking system for consumer home use are indispensable to heat various metallic pans, such as aluminum, copper, stainless steel, and iron cast for further diffusing. Furthermore, these appliances have to satisfy the utility AC grid harmonics regulations of IEC61000-3-2. To meet these requirements, this paper proposes a two-stage soft-switching high-frequency inverter with simple PFC function that is suitable for consumer IH cooking appliances. The proposed system comprises a soft-switching chopper based boost PFC converter with passive snubber and phase-shifted PWM controlled ZVZCS high-frequency inverter. In order to satisfy the utility AC grid current harmonic regulations, a simple PFC control technique with discontinuous current mode is introduced. This technique as well as the fundamental operating performances of the proposed IH system is tested. The effectiveness of proposed IH system is substantially proved from a practical point of view on the basis of the experimental results.

    DOI: 10.1541/ieejias.130.450

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  • A High Frequency-Link Bidirectional DC-DC Converter for Super Capacitor-Based Automotive Auxiliary Electric Power Systems

    Tomokazu Mishima, Eiji Hiraki, Mutsuo Nakaoka

    JOURNAL OF POWER ELECTRONICS   10 ( 1 )   27 - 33   2010.1

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    DOI: 10.6113/JPE.2010.10.1.027

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  • A Starting Method of the Harmonic Current Compensator using the Hybrid Active Filter for Wind Power Generation Systems with Soft Starters

    Yamada Hiroaki, Hiraki Eiji, Tanaka Toshihiko

    Journal of the Japan Institute of Power Electronics   35 ( 35 )   129 - 135   2010

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    This paper proposes a new starting method of the harmonic current compensator using the hybrid active filter for wind power generation systems. In the proposed method, an active filter of the hybrid power filter behaves a resistor and reactive power compensator to suppress the source currents oscillation and leading currents under the starting conditon. The basic principle of the proposed starting method is discussed, and then confirmed by digital computer simulation using PSCAD/EMTDC. Simulation results demonstrate that the proposed starting method can overcome the inrush and phase-leading currents, building up the dc capacitor voltage of the active filter.

    DOI: 10.5416/jipe.35.129

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  • A Comparative Evaluation of DCM Control and CCM Control for Soft-Switching PFC Converter

    Yuki Kawaguchi, Eiji Hiraki, Toshihiko Tanaka, Hideki Sadakata, Atsushi Fujita, Hideki Omori, Mutsuo Nakaoka

    IECON 2010: 36TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY   2010

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  • Performance Verification of a Novel Soft Switching Three-Phase Utility Frequency AC to High Frequency AC Direct Power Converter with PFC Function for Industrial IH Applications

    Takaaki Takahara, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Tamotsu Hashizume, Tetsu Kachi

    PROCEEDINGS OF 14TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (EPE-PEMC 2010)   2010

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  • Simulation Analysis of Energy-Saving Effect of an Energy Recovery System for Electric Motor Drive System in the Injection Molding Machine

    Keisuke Takahashi, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka

    PROCEEDINGS OF 14TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (EPE-PEMC 2010)   130 ( 5 )   713 - 714   2010

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    DOI: 10.1541/ieejias.130.713

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  • A New Half-Bridge Based Inverter with the Reduced-Capacity DC Capacitors for DC Micro-Grid

    Toshihiko Tanaka, Tsukasa Sekiya, Yusuke Baba, Masayuki Okamoto, Eiji Hiraki

    2010 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION   2564 - 2569   2010

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    DOI: 10.1109/ECCE.2010.5617983

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  • A Charge Boost Type Multi Output Full Bride High Frequency Soft Switching Inverter for IH Cooking Appliance

    Shin Zenitani, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka

    PROCEEDINGS OF 14TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE (EPE-PEMC 2010)   2010

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  • B-9-16 A Buck Type DC-DC Converter with a Coupled Inductor

    Watanabe Jun, Hiraki Eiji, Tanaka Toshihiko

    Proceedings of the IEICE General Conference   2010   338 - 338   2010

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  • A Comparative Evaluation of DCM Control and CCM Control for Soft-Switching PFC Converter Used in Consumer IH Cooking Heater

    Kawaguchi Yuki, Hiraki Eiji, Tanaka Toshihiko, Sadakata Hideki, Omori Hideki, Nakaoka Mutsuo

    Journal of the Japan Institute of Power Electronics   35 ( 35 )   114 - 121   2010

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    Harmonic currents in the utility side generated from the power electric equipment such as IH cooking heaters involve harmful influences to the other electrical applications. To suppress harmonic influences, adding the PFC converter to the input stage of IH cooking heater is one of the practical solutions. In this paper, two operation modes; DCM and CCM for the PFC converter are compared and tested from the view points of magnetic volume of the boost and filter inductors, source current harmonics suppression, power conversion efficiency and input power factor to clarify the suitable operation mode for home-use IH cooking appliance.

    DOI: 10.5416/jipe.35.114

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  • A half-bridge inverter based active power quality compensator for electrified railways

    T. Tanaka, K. Ishibashi, N. Ishikura, E. Hiraki

    2010 International Power Electronics Conference - ECCE Asia -, IPEC 2010   1590 - 1595   2010

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    DOI: 10.1109/IPEC.2010.5543371

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  • A New Current Balancer in Single-Phase Three-Wire Secondary Distribution Feeders Using the Correlation Coefficients

    Toshihiko Tanaka, Hirokazu Fukui, Eiji Hiraki, Shuuji Watanabe, Shinji Fukuma

    ELECTRICAL ENGINEERING IN JAPAN   169 ( 1 )   50 - 58   2009.10

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    DOI: 10.1002/eej.20843

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  • New Control Method of Active Power Quality Compensator with Reduced-Capacity Three-Leg Inverter for Electrified Railways

    ISHIKURA Norio, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   129 ( 9 )   907 - 913   2009.9

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    This paper proposes a new control method for reducing the capacity of an active power quality compensator with a three-leg inverter used in electrified railways. In the proposed control method, the fundamental reactive and unbalanced-active components of the load currents are detected. The non-active and unbalanced-active components are compensated on the source side with the fundamental reactive power control. This reactive power control reduces the capacity of the three-leg inverter, which performs the active power quality compensator. The basic principle of the proposed control method is discussed in detail, and then confirmed by digital computer simulation using the PSIM software. A reduced-scale experimental model is constructed and tested. Experimental results demonstrate that the balanced sinusoidal source currents with the power factor of 0.9 are obtained, reducing the capacity of the three-leg inverter by 13% as compared to the already proposed control method.

    DOI: 10.1541/ieejias.129.907

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  • A Large-Capacity Capacitor Simulator Using a Bi-directional Chopper and PWM Rectifier

    NISHIMURA Kazunori, MATSUMOTO Shuhei, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   129 ( 8 )   852 - 853   2009.8

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    This paper proposes a large-capacity capacitor simulator consisting of a chemical capacitor and three-leg converter. One of three legs performs a bi-directional chopper. The others are used for a PWM rectifier. In the charging mode the most of the power stored in the chemical capacitor is injected to the utility through the PWM rectifier. In the discharging mode the power is supplied to the chemical capacitor side from the utility through the PWM rectifier. Thus the proposed simulator performs a large-capacity capacitor. The basic principle of the proposed simulator is discussed in detail. A prototype experimental model is constructed and tested. Experimental results demonstrate the validity and excellent practicability of the proposed simulator.

    DOI: 10.1541/ieejias.129.852

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  • A Constant DC Voltage Control Based Compensation Method of an Active Power Quality Compensator for Electrified Railways

    Toshihiko Tanaka, Norio Ishikura, Eiji Hiraki

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING   4 ( 3 )   435 - 441   2009.5

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    DOI: 10.1002/tee.20428

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  • A Push-Pull Converter Based Bidirectional DC-DC Interface for Energy Storage Systems

    Eiji Hiraki, Kazumasa Hirao, Toshihiko Tanaka, Tomokazu Mishima

    EPE: 2009 13TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS, VOLS 1-9   5842 - 5851   2009

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  • A Comparison of Operation Mode for Soft-Switching PFC Converter for Induction Heating Cooking Appliance

    Yuki Kawaguchi, Eiji Hiraki, Toshihiko Tanaka, Hideki Sadakata, Atsushi Fujita, Hideki Omori, Mutsuo Nakaoka

    IECON: 2009 35TH ANNUAL CONFERENCE OF IEEE INDUSTRIAL ELECTRONICS, VOLS 1-6   13 - 18   2009

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    DOI: 10.1109/IECON.2009.5414802

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  • A Novel Soft Switching Three-Phase Utility Frequency AC to High Frequency AC Direct Power Converter with PFC Function for Industrial IH Appliance

    Takaaki Takahara, Yuki Kawaguchi, Eiji Hiraki, Toshihiko Tanaka, Kazunori Nishimura

    2009 INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS, VOLS 1 AND 2   1192 - +   2009

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  • A Constant DC Voltage Control Based Strategy for an Active Power Quality Compensator Used in Electrified Railways with Improved Response

    N. Ishikura, E. Hiraki, T. Tanaka

    IECON: 2009 35TH ANNUAL CONFERENCE OF IEEE INDUSTRIAL ELECTRONICS, VOLS 1-6   3023 - 3028   2009

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    DOI: 10.1109/IECON.2009.5415311

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  • Stand-alone photovoltaic generation system with combined storage system using EDLC

    Hiroaki Nakayama, Eiji Hiraki, Toshihiko Tanaka, Noriaki Koda, Nobuo Takahashi, Shuji Noda

    IECON Proceedings (Industrial Electronics Conference)   883 - 888   2009

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    DOI: 10.1109/IECON.2009.5415035

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  • A Large-Capacity Capacitor Simulator with a PWM Rectifier and Bi-directional DC-to-DC Converter

    A. Tanaka, E. Hiraki, T. Tanaka

    2009 INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS, VOLS 1 AND 2   1318 - 1323   2009

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    DOI: 10.1109/PEDS.2009.5385902

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  • Basic study of a phase-shifted soft switching high-frequency inverter with boost PFC converter for induction heating

    Yuki Kawaguchi, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka

    JOURNAL OF POWER ELECTRONICS   8 ( 2 )   192 - 199   2008.4

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  • A Constant DC Voltage Control Based Method of the Active Power Quality Compensator for Electrified Railways

    TANAKA Toshihiko, ISHIKURA Norio, FUKUI Hirokazu, HIRAKI Eiji

    IEEJ Transactions on Industry Applications   128 ( 2 )   145 - 146   2008.2

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    This paper proposes a novel control method for the active power quality compensator used in electrified railways. In the proposed method, only the constant dc voltage control is used to compensate the non-active and unbalanced active currents on the secondary side of the Scott transformer. Any schemes to detect the reactive and harmonic currents are not needed. Thus we can provide the simplest way to improve the power quality in electrified railways. The basic principle of the proposed control method is discussed. The validity and excellent practicability are confirmed by digital computer simulation using PSIM soft ware.

    DOI: 10.1541/ieejias.128.145

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  • A New Control Method of Current Balancer for Single-Phase Three-Wire Secondary Distribution Systems Using the Correlation and Cross-Correlation Coefficients

    FUKUI Hirokazu, HIRAKI Eiji, TANAKA Toshihiko, FUKUMA Shinji

    IEEJ Transactions on Industry Applications   128 ( 1 )   34 - 40   2008.1

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    This paper proposes a new control method of the current balancer for single-phase three-wire secondary distribution systems using the correlation and cross-correlation coefficients. The components of the load currents correlative and cross-correlative to the primary side voltage waveform, which correspond to the active and reactive currents, are detected in each feeder, then the reactive and unbalanced-active components are compensated on the source side. The balanced currents with the variable power factor are obtained in each feeder. The basic principle of the proposed method is discussed in detail, and then confirmed by digital computer simulation. A proto-type experimental system is constructed and tested. Experimental results demonstrate that the balanced source currents with the power factor of 0.9 are obtained in spite of unbalanced load currents.

    DOI: 10.1541/ieejias.128.34

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  • Stand-alone Photovoltaic Generation System with Combined Storage using lead Battery and EDLC

    Hiroaki Nakayama, Eiji Hiraki, Toshihiko Tanaka, Noriaki Koda, Nobuo Takahashi, Shuji Node

    2008 13TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE, VOLS 1-5   1877 - +   2008

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  • A Novel Type Single-Stage ZVS-PWM High-Frequency Load Resonant Inverter with High Performance PFC Rectifier for Consumer IH Appliances

    Hisayuki Sugimura, Sang-Pil Mun, Soon-Kurl Kwon, Shinichiro Sumiyoshi, Hideki Omori, Eiji Hiraki, Mutsuo Nakaoka

    ICEMS 2008: PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS, VOLS 1- 8   1215 - +   2008

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  • Active Voltage Clamped Edge-Resonant Soft Switching PWM High Frequency Cyclo-Converter Using Bidirectional Switches

    Hisayuki Sugimura, Sang-Pil Mun, Soon-Kurl Kwon, Eiji Hiraki, Mutsuo Nakaoka

    2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-10   3917 - +   2008

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  • New Built-in Induction Heating Cooker Using High-Frequency ZVS-PWM Converter with Single Stage Circuit Topology

    Hisayuki Sugimura, Bishwajit Saha, Shinichiro Sumiyoshi, Hideki Omori, Sang-Pil Mun, Soon-Kurl Kwon, Eiji Hiraki, Mutsuo Nakaoka

    2008 IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING, VOLS 1-5   1010 - +   2008

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  • A New Soft-Switching PWM High Frequency Half-Bridge Inverter Linked DC-DC Converter with Diode-Clamped Active Edge Resonant Snubbers

    Hisayuki Sugimura, Tetsuya Etoh, Toshimitsu Doi, Keiki Morimoto, Bishwajit Saha, Sang Pil Mun, Eiji Hiraki, Mutsuo Nakaoka

    2008 IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING, VOLS 1-5   2410 - +   2008

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  • Feasible Evaluation of a Full-Bridge Inverter for Induction Heating Cooking Appliances with Discontinuous Current Mode PFC Control

    Yuki Kawaguchi, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka, Atsushi Fujita, Hideki Omori

    2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-10   2948 - +   2008

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  • A Single Active Edge-Resonant Snubber Cell-assisted ZCS Half-Bridge DC-DC Converter with Constant Frequency Asymmetrical PWM Scheme

    Tomokazu Mishima, Mutsuo Nakaoka, Eiji Hiraki

    2008 13TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE, VOLS 1-5   119 - +   2008

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  • Soft-Switching PWM-SEPP High-Frequency Inverter with Single ZCS Cell for IH Cooking Heater

    Miura Yuta, Atsushi Fujita, Omori Hideki, Hiraki Eiji, Nakaoka Mutsuo

    Journal of the Japan Institute of Power Electronics   34   103 - 110   2008

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    In this paper, multi-resonant zero current soft switching (ZCS) -PWM single ended push pull (SEPP) high frequency inverter is newly demonstrated for consumer induction heating (IH) appliances. The proposed inverter circuit has a novel ZCS cell consisting of high side main switch with lossless inductor snubber and active edge-resonant commutation cell (AERCC). The AERCC consisting of auxiliary diode, auxiliary resonant capacitor, auxiliary resonant inductor and auxiliary switch in parallel with the high side main switch arm. In the newly proposed inverter, heating power of IH cooking heater is controlled continuously during all heating power range under a principle of ZCS. The operating principle and performance analysis of the newly proposed inverter with asymmetrical pulse width modulation (PWM) control scheme are described using equivalent circuits in switching mode. This high frequency inverter can regulate heating power continuously from 0.25kW to 2.74kW in experiment with asymmetrical PWM control scheme. Finally, compared with conventional ZVS-PWM-SEPP high frequency inverter with asymmetrical PWM scheme, its power conversion efficiency of is high enough even in at low power range. The feasible effectiveness and practicability of the high frequency inverter treated here are substantially proved on the basis of experimental results for consumer IH cooking heater.

    DOI: 10.5416/jipe2003.34.0_103

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  • 13th International Power Electronics and Motion Control Conference

    Hiraki Eiji

    Journal of the Japan Institute of Power Electronics   34   226 - 226   2008

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    DOI: 10.5416/jipe2003.34.0_226

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  • A stand-alone photovoltaic generation system with soft-switching converters

    Nakayama Hiroaki, Hraki Eiji, Tanaka Toshihiko, Koda Noriaki, Takahashi Nobuo, Noda Shuji

    Journal of the Japan Institute of Power Electronics   34   143 - 150   2008

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    This paper deals with stand-alone photovoltaic (PV) generation systems low power DC applications, where a combined energy storage device consisting of an acid battery and Electric Double Layer Capacitor (EDLC) to avoid the deep discharge of the acid battery. Two types of the stand-alone PV generation systems, with a conventional converters and soft-switching converter, are constructed and tested. Experimental results demonstrate that the conventional type is very simple, but a large capacity EDLC is needed because of low efficiency. Efficiency of the PV generation system with soft-switching converters is high compared with that of the conventional type, and reduces the capacity of the EDLC. The PV generation system with soft-switching converters is useful for practical applications.

    DOI: 10.5416/jipe2003.34.0_143

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  • A Novel Simple Control Method of an Active Power Quality Compensator Used in Electrified Railways with Constant DC Voltage Control

    T. Tanaka, N. Ishikura, E. Hiraki

    IECON 2008: 34TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1-5, PROCEEDINGS   451 - 456   2008

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    DOI: 10.1109/IECON.2008.4758004

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  • A novel half-bridge asymmetrical ZCS-PWM DC-DC converter with high frequency-link

    Tomokazu Mishima, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka

    IEEJ Transactions on Industry Applications   128 ( 4 )   5 - 395   2008

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    DOI: 10.1541/ieejias.128.388

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  • High-frequency link symmetrical active edge resonant snubbers-assisted ZCS-PWM DC-DC converter

    T. Mishima, E. Hiraki, T. Tanaka, M. Nakaoka

    IET ELECTRIC POWER APPLICATIONS   1 ( 6 )   907 - 914   2007.11

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    DOI: 10.1049/iet-epa:20060508

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  • A novel detection method of active and reactive currents in single-phase circuits using the correlation and cross-correlation coefficients and its applications

    Toshihiko Tanaka, Eiji Hiraki, Kengo Ueda, Kuniaki Sato, Shinji Fukuma

    IEEE TRANSACTIONS ON POWER DELIVERY   22 ( 4 )   2450 - 2456   2007.10

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    DOI: 10.1109/TPWRD.2007.905359

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  • An Isolated Bi-directional DC-DC Soft Switching Converter for Super Capacitor Based Energy Storage Systems

    YAMAMOTO Koji, HIRAKI Eiji, TANAKA Toshihiko, MISHIMA Tomokazu

    IEICE technical report   107 ( 149 )   21 - 26   2007.7

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    In recent years, power electronic energy storage systems using super capacitor bank have been widely studied and developed for the electronic vehicles. In this paper, a full-bridge/centertapped push-pull with active clamp circuit based soft switching bidirectional DC-DC converter and its control method are presented and discussed. From the results of basic experimental demonstration, switching losses in the active switches are drastically reduced by ZCS/ZVS operation with the assistance of newly added active clump circuit, as well as ZVS operation with lossless snubber capacitor in high-voltage primary side.

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  • A Novel Detection Method of Active and Reactive Currents in Single-Phase Circuits Using PLL Circuit

    OMURA Yasushi, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   127 ( 5 )   538 - 539   2007.5

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    This paper proposes a novel detection method of active and reactive currents in single-phase circuits. This method uses only two multipliers and LPFs for detecting active and reactive currents with a PLL circuit. In the proposed method the fundamental active-reactive component in single-phase circuits can be detected by LPFs in the time domain like the instantaneous active-reactive power theory in three-phase circuits. The basic principle of the proposed detection method is discussed in detail, and then confirmed by digital computer simulation. Digital computer simulation results demonstrate that the proposed method can detect the active-reactive current in single-phase circuits in the time domain.

    DOI: 10.1541/ieejias.127.538

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  • A novel prototype of active auxiliary edge-resonant snubber-assisted ZCS-PWM DC-DC converter: evaluation on operation characteristics

    Mishima Tomokazu, Hiraki Eiji, Nakaoka Mutsuo

    Journal of the Japan Institute of Power Electronics   33   157 - 163   2007

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    A novel prototype of a soft-switching PWM DC-DC converter is presented in this paper. This converter consists of a half-bridge circuit assisted with an active edge resonant snubber for Zero Current Soft-switching (ZCS) commutation, and a current doubles rectifier linked with a high-frequency transformer. With the ZCS scheme and the circuit topology proposed here, the soft switching operation can be achieved for the wide range of output power under a constant switching frequency. The converter operation and characteristics are demonstrated with simulation results, and its feasibility is verified with experimental results using its 1.2kW-35kHz prototype.

    DOI: 10.5416/jipe2003.33.0_157

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  • An isolated bidirectional DC-DC soft switching converter for super capacitor based energy storage systems

    Eiji Hiraki, Koji Yamamoto, Toshihiko Tanaka, Tomokazu Mishima

    2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6   2007 ( 74 )   390 - 395   2007

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    DOI: 10.1109/PESC.2007.4342018

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  • Operation analysis of a novel high frequency-link asymmetrical half-bridge ZCS-PWM DC-DC converter

    Tomokazu Mishima, Eiji Hiraki, Toshihiko Tanaka, Khairy Fathy, Mutsuo Nakaoka

    2007 POWER CONVERSION CONFERENCE - NAGOYA, VOLS 1-3   573 - +   2007

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  • A novel low-voltage/high-current ZCS-PWM DC-DC converter with asymmetrical auxiliary edge-resonant lossless snubber

    Tomokazu Mishima, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka

    2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6   748 - 753   2007

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    DOI: 10.1109/PESC.2007.4342081

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  • A New Current Balancer in Single-Phase Three-Wire Secondary Distribution Feeders Using the Correlation Coefficients

    Tanaka Toshihiko, Fukui Hirokazu, Hiraki Eiji, Watanabe Shuuji, Fukuma Shinji

    IEEJ Transactions on Industry Applications   127 ( 6 )   675 - 681   2007

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    This paper proposes a new current balancer in single-phase three-wire secondary distribution systems using the correlation coefficients. The components of the load currents correlative to the primary side voltage waveform, which correspond to the active currents, are detected in each feeder, then the non-active and unbalanced-active components are compensated on the source side. The balanced currents with unity power factor are obtained in each feeder. The basic principle of the proposed method is discussed in detail, and then confirmed by digital computer simulation. A proto-type experimental system is constructed and tested. Experimental results demonstrate that the balanced source currents with unity power factor are obtained in spite of unbalanced load currents.

    DOI: 10.1541/ieejias.127.675

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  • A new phase shifted ZVS-PWM controlled full bridge series resonant high frequency inverter with auxiliary active quasi-resonant commutation circuit

    Hisayuki Sugimura, Soon-Kurl Kwon, Hiroyuki Ogiwara, Eiji Hiraki, Mutsuo Nakaoka

    2007 POWER CONVERSION CONFERENCE - NAGOYA, VOLS 1-3   1461 - +   2007

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  • A new current balancer for single-phase three-wire secondary distribution feeders using the correlation coefficients

    Toshihiko Tanaka, Hirokazu Fukui, Eiji Hiraki

    2007 POWER CONVERSION CONFERENCE - NAGOYA, VOLS 1-3   83 - +   2007

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  • A new method of compensating harmonic currents for wind power generation systems with the soft starter using a hybrid active filter

    Hiroaki Yamada, Miho Enami, Eiji Hiraki, Toshihiko Tanaka

    2007 POWER CONVERSION CONFERENCE - NAGOYA, VOLS 1-3   382 - +   2007

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  • Full bridge phase-shifted soft switching high-frequency inverter with boost PFC function for induction heating system

    Yuki Kawaguchi, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka

    2007 EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS, VOLS 1-10   1647 - 1654   2007

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  • Direct high frequency soft switching inverter type AC-DC power converter with boost function for consumer magnetron drive

    Mutsuo Nakaoka, Bishwajit Saha, Hisayuki Sugimura, Sang Pi Mun, Eiji Hiraki, Hideki Omori

    IECON 2007: 33RD ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1-3, CONFERENCE PROCEEDINGS   1336 - +   2007

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    DOI: 10.1109/IECON.2007.4459958

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  • Direct high frequency soft switching PWM cyclo-converter-fed AC-DC converter without DC link for consumer magnetron drive

    Hisayuki Sugimura, Bishwajit Saha, Sang Pil Mun, Eiji Hiraki, Hideki Omori, Mutsuo Nakaoka

    7th Internatonal Conference on Power Electronics, ICPE'07   1185 - 1190   2007

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    DOI: 10.1109/ICPE.2007.4692565

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  • Newly proposed hybrid resonant commutation bridge-leg link snubber-assisted three-phase ZVZCS-PWM soft-switching inverter

    Eiji Hiraki, Masanobu Yoshida, Yoshihiko Hirota, Mutsuo Nakaoka

    ELECTRICAL ENGINEERING IN JAPAN   157 ( 4 )   75 - 84   2006.12

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    DOI: 10.1002/eej.20111

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  • A New Method of Compensating the Harmonic Current in Wind Power Generation Systems with the Soft Starter Using the Hybrid Active Filter

    YAMADA Hiroaki, HIRAKI Eiji, TANAKA Toshihiko

    電気学会半導体電力変換研究会資料   2006 ( 87 )   51 - 56   2006.6

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  • A New Method of Compensating Harmonic Currents under the Soft Start in Wind Power Generation Systems Using the Hybrid Filter

    YAMADA Hiroaki, HIRAKI Eiji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   126 ( 6 )   818 - 819   2006.6

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    This paper proposes a new method of compensating harmonic currents under the soft start in wind power generation systems using the hybrid filter, which consists of a passive and small-rated active filters. For the fundamental component, the passive filter behaves a phase-leading capacitor. The small-rated active filter compensates the harmonic currents under the soft start. The basic principle of the proposed compensator is discussed, and then confirmed by digital computer simulation using PSCAD/EMTDC. Simulation results demonstrate that the source currents become sinusoidal waveforms under the soft start.

    DOI: 10.1541/ieejias.126.818

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  • Bidirectional DC-DC Converter for Supercapacitor-Linked Power Interface in Advanced Electric Vehicles

    MISHIMA Tomokazu, HIRAKI Eiji, YAMAMOTO Kouji, TANAKA Toshihiko

    IEEJ Transactions on Industry Applications   126 ( 4 )   529 - 530   2006.4

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    A bidirectional DC-DC converter for supercapacitor-based energy storage systems in advanced electric vehicles is proposed in this letter. This converter consists of a half-bridge and current-fed push-pull circuit linked with a high frequency transformer, which is well applicable to the low voltage/high current charge and discharge of the supercapacitor. The experimental results of the prototype system prove the effective properties of the proposed topology in terms of a low device-conduction loss and a low switching surge.

    DOI: 10.1541/ieejias.126.529

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  • Advanced High Power DC-DC Converter using A Novel Type Voltage Source Full-Bridge Soft-Switching PWM Inverter with High Frequency Transformer Link for Arc Welding Applications

    MORIMOTO Keiki, DOI Toshimitsu, MANABE Haruhiko, AHMED Tarek, HIRAKI Eiji, LEE Hyun-Woo, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   126 ( 3 )   237 - 247   2006.3

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    This paper presents a new circuit topology of full-bridge soft-switching PWM inverter linked DC-DC power converter composed of conventional full-bridge high frequency PWM inverter with high frequency transformer and an active quasi-resonant snubber consisting of an additional power switching device in series with DC busline and a lossless capacitor in parallel with DC busline. Under this proposed high frequency soft-switching PWM inverter linked DC-DC converter, four power switches in the full-bridge arms and DC busline series switch can achieve ZVS at turn-off commutation. By developing the advanced soft-switching PWM high frequency inverter type DC-DC converter, although the conduction power loss of DC busline series power switch increases a little, the total turn-off switching loss of full-bridge high frequency inverter power modules can be sufficiently lowered more and more in the higher frequency range of 60kHz. As a result, when the switching frequency of high frequency inverter power stage using IGBT power modules is designed so as to be more than about 10kHz, the more the switching frequency of inverter increases, the more this high frequency soft-switching DC-DC converter has remarkable advantage as for the power conversion efficiency as compared with the conventional hard-switching PWM inverter DC-DC converter. Its practical effectiveness of high power density and high performance is actually proved for TIG arc welding equipment in industry.

    DOI: 10.1541/ieejias.126.237

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  • Characteristic Evaluations of Three-Phase AC-AC Direct Converter with PFC Function

    NAKAO Masahiro, HIRAKI Eiji, TANAKA Toshihiko, NAKAOKA Mutsuo

    IEICE technical report   105 ( 601 )   127 - 132   2006.2

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    This paper presents a soft switching duty factor controlled AC-AC direct conversion circuit for high frequency Induction Heated applications, which have unity power factor and sinewave line current shaping functions. The proposed utility frequency AC-high frequency AC direct inverter as direct step-up frequency changer for converting commercial low frequency AC (LFAC) into high frequency AC (HFAC) more than 20kHz can be composed of minimum circuit components for resonant pars filter and diodes, which is possible to implement effective miniaturization, low cost, reliability, downsizing because of the non-electrolytic capacitor (at zero voltage soft switching commutation scheme). This paper describes the operating principle and its unique features of LFAC-HFAC soft switching PWM direct conversion circuit. Its utility AC side sinewave current quality and unity power factor correction characteristics are evaluated and discussed from an experiment point of view. Its practical effectiveness of this direct frequency changer is proven for high frequency induction heated appliances in home and business usages.

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  • A Study of the Half-Bridge type Bidirectional DC-DC Converter for a Supercapacitor-linked Power Interface

    MISHIMA Tomokazu, HIRAKI Eiji, YAMAMOTO Kouji, TANAKA Toshihiko

    電気学会半導体電力変換研究会資料   2006 ( 36 )   25 - 28   2006.1

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  • A New Control Method of the Current Balancer in Single-Phase Three-Wire Secondary Distribution Systems Using the Correlation Function

    TANAKA Toshihiko, FUKUI Hirokazu, HIRAKI Eiji, WATANABE Shuuji, FUKUMA Shinji

    IEEJ Transactions on Industry Applications   126 ( 1 )   84 - 85   2006.1

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    This paper proposes a new control method of the current balancer in single-phase three-wire secondary distribution systems using the correlation function. The components of the load currents correlative to the primary side voltage waveform, which correspond to the active currents, are detected in each feeder, then the non-active and unbalanced-active components are compensated on the source side. The balanced currents with unity power factor are obtained in each feeder. The basic principle of the proposed method is discussed in detail, and then confirmed by digital computer simulation. Digital computer simulation results demonstrate that the balanced source currents with unity power factor are obtained in spite of unbalanced load currents.

    DOI: 10.1541/ieejias.126.84

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  • Operation evaluation of the symmetric switched-capacitor snubbers-assisted ZCS bidirectional DC-DC converter

    Mishima Tomokazu, Hiraki Eiji, Tanaka Toshihiko, Nakaoka Mutsuo

    Journal of the Japan Institute of Power Electronics   32   113 - 121   2006

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    A new type of soft switched bidirectional DC-DC converter for advanced automotive electric power systems is presented in this paper. This converter consists of dual half-bridge circuits linked with a high frequency transformer, which is applicable as an interface between a high-voltage DC bus line and a low-voltage power source such as Supercapacitor. In order to reduce the switching losses and expand the soft switching range, a newly developed two-lossless switched capacitor snubber-assisted Zero Current Switching (ZCS) are applied to the primary side circuit. By using this ZCS scheme, the soft switching operation can be achieved for the wide range of output power. The converter operation is demonstrated with simulation results, and its feasibility is verified with experimental results using its 1.0kW 25kHz prototype system.

    DOI: 10.5416/jipe2003.32.0_113

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  • Bidirectional DC-DC converter with full-bridge/push-pull circuit for automobile electric power systems

    Koji Yamamoto, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka, Tomokazu Mishima

    2006 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-7   2340 - +   2006

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  • A new soft-switched bidirectional DC-DC converter topology for automotive high voltage DC bus architectures

    Tomokazu Mishima, Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka

    2006 IEEE VEHICLE POWER AND PROPULSION CONFERENCE   386 - +   2006

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  • An isolated bidirectional DC-DC converter based super-capacitor interface for automobile electric power systems

    Eiji Hiraki, Koji Yamamoto, Toshihiko Tanaka, Tomokazu Mishima, Mutsuo Nakaoka

    2006 12TH INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE, VOLS 1-4   1025 - +   2006

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  • A ZCS lossless snubber cells-applied half-bridge bidirectional DC-DC converter for automotive electric power systems

    Tomokazu Mishima, Eiji Hiraki, Toshihiko Tanaka

    2006 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-7   917 - 922   2006

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  • PLL回路を用いた単相回路における簡易な有効・無効電流検出法

    松本 脩平, 田中 俊彦, 平木 英治, 大村 泰, 山本 真義

    パワーエレクトロニクス学会誌   32   192 - 192   2006

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    DOI: 10.5416/jipe2003.32.0_192

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  • A novel method of suppressing the inrush current of transformers using a series-connected voltage-source PWM converter Reviewed

    Hiroaki Yamada, Eiji Hiraki, Toshihiko Tanaka

    Proceedings of the International Conference on Power Electronics and Drive Systems   1   280 - 285   2005.12

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  • A New Control Method of Current Balancer in Single-Phase Three-Wire Secondary Distribution Systems Using the Correlation Function

    FUKUI Hirokazu, WATANABE Syuuji, HIRAKI Eiji, TANAKA Toshihiko

    電気学会半導体電力変換研究会資料   2005 ( 58 )   13 - 18   2005.6

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  • Static VAR Compensator-Based Voltage Regulation for Variable-Speed Prime Mover Coupled Single-Phase Self-Excited Induction Generator

    AHMED Tarek, NORO Osamu, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Sensors and Micromachines   125 ( 4 )   355 - 365   2005.4

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    In this paper, the single-phase static VAR compensator (SVC) is applied to regulate and stabilize smoothly the generated output voltage of the single-phase self-excited induction generator (single-phase SEIG) driven by a variable-speed prime mover (VSPM) under the conditions of inductive load variations and prime mover speed changes. The conventional fixed gain PI controller-based feedback control scheme is employed to adjust the equivalent capacitance of the single-phase SVC composed of the fixed excitation capacitor (FC) in parallel with the thyristor switched capacitor (TSC) and the thyristor controlled reactor TCR. A PI closed-loop feedback voltage control scheme based on the SVC for the single-phase SEIG coupled by a VSPM prototype set-up is established. The closed-loop feedback output voltage responses in the single-phase SEIG coupled by a VSPM with different inductive load variations using the single-phase SVC with the PI controller are considered and discussed herein. Based on the SVC with the PI controller closed-loop feedback voltage regulation scheme, the experimental results for the single-phase SEIG driven by a VSPM are illustrated and proved its practical effectiveness in terms of the fast response and the high performances.

    DOI: 10.1541/ieejias.125.355

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  • A Novel Soft Switching PWM Power Frequency Converter with Non DC Smoothing Filter Link for Consumer High Frequency Induction Heating

    Sugimura Hisayuki, Muraoka Hidekazu, Hiraki Eiji, Hirota Izuo, Yasui Kenji, Omori Hideki, Lee Hyun-Woo, Nakaoka Mutsuo

    IEEJ Transactions on Industry Applications   125 ( 11 )   988 - 999   2005

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    In this paper, high frequency power converter without DC smoothing electrolytic capacitor filter link which convert the 100V/200Vrms and 60Hz single phase utility frequency AC power into a high frequency AC. This proposed high frequency AC power converter without electrolytic capacitor filter can operate under a principle of soft switching PWM based on a lossless capacitor snubber is proposed and demonstrated for consumer high frequency induction heating (IH). In particular, this high frequency power converter capable of producing a high frequency AC more than 20kHz is developed for consumer IH applications as hot water producer and steamer based on the specially designed spiral type IH-Dual Packs Heater (DPH), which includes the dual mode pulse modulation control scheme based on soft switching PWM for high output power setting and commercial frequency AC zero voltage soft switching pulse density modulation (PDM) for low output power settings. This developed high frequency power frequency converter using trench gate IGBTs is clarified on the basis of experimental and simulation results for its circuit operation of the utility frequency AC to high frequency AC frequency PWM power converter without the electrolytic capacitor bank DC filter link for the IH hot water and IH steamer. These IH appliances are based upon an innovative electromagnetic IH-DPH for fluid heating as heat exchanger in consumer pipeline. Finally, its power regulation characteristics, power conversion efficiency and harmonic current components characteristics including power factor in utility AC grid side are evaluated and discussed from an experimental point of view. The practical effectiveness of this utility frequency AC to high frequency AC soft switching high power frequency converter defined conveniently as high frequency soft switching cyclo-inverter is proved as one of the important products effective for next generation IH application all electricity power utilizations.

    DOI: 10.1541/ieejias.125.988

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  • 位相シフトPWM制御高周波インバータを用いたIHポーラス金属デュアルパックスヒータ方式給湯器の開発

    藤田堅太郎, 杉村央生, 安井健治, 弘田泉生, 岩井利明, 大森英樹, 村岡秀和, 平木英治, 中岡睦雄

    エレクトロヒート   ( 140 )   2005

  • Power Electronics in Latest Small-Scale High Frequency Switching Power Converters

    Hiraki Eiji, Nakaoka Mutsuo

    IEEJ Transactions on Industry Applications   125 ( 11 )   955 - 963   2005

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    In resent years, the soft switching commutated power converter technologies have attracted special interest in order to minimize semiconductor switching power losses and reduce conductive switching noise. This special issue deals with some schematic descriptions on application-specific quasi-resonant power converter circuits, which make use of soft switching commutation schemes.

    DOI: 10.1541/ieejias.125.955

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  • Consideration of time sharing output pulse pattern using instantaneous space voltage vector moderation for three-phase voltage source soft-switching inverter

    M Yoshida, E Hiraki, M Nakaoka

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS   88 ( 2 )   34 - 40   2005

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  • Dual-mode time-sharing one-stage single-phase power conditioner using sinewave tracked soft switching PWM boost chopper

    NA Ahmed, HW Lee, M Nakaoka, T Ahmed, E Hiraki, M Miyatake

    CONFERENCE RECORD OF THE 2005 IEEE INDUSTRY APPLICATIONS CONFERENCE, VOLS 1-4   3   1612 - 1617   2005

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  • New auxiliary active lossless snubber-assisted full bridge soft switching PWM high frequency inverter-fed DC-DC power converter

    Tetsuya Etoh, Tarek Ahmed, Eiji Hiraki, Keiki Morimoto, Nabil A. Ahmed, Ki-Young Suh, Hyun Woo Lee, Mutsuo Nakaoka

    ICEMS 2005: Proceedings of the Eighth International Conference on Electrical Machines and Systems   2   1090 - 1094   2005

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    DOI: 10.1109/icems.2005.202715

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  • Zero-voltage and zero-current soft - Switching PWM inverter

    Eiji Hiraki, Toshihiko Tanaka, Mutsuo Nakaoka

    2005 European Conference on Power Electronics and Applications   2005   2005

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    DOI: 10.1109/epe.2005.219661

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  • Output Voltage Waveform THD Improvement on Instantaneous Space Voltage Vector Modulation Procedure for Three-Phase Sinwave Soft Switching Inverter

    HIRAKI Eiji, NAKAOKA Mutsuo

    The Transactions of the Institute of Electronics, Information and Communication Engineers B   87 ( 5 )   736 - 740   2004.5

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  • Comparative Electromagnetic Noise Evaluations of ZVZCS Resonant Snubber and ZVS Resonant Snubber-Assisted Soft-Switching PWM Inverters

    YOSHIDA Masanobu, HIROTA Yoshihiko, HIRAKI Eiji, NAKAOKA Mutsuo

    The Transactions of the Institute of Electronics, Information and Communication Engineers B   87 ( 5 )   726 - 732   2004.5

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  • Series Resonant ZCS-PFM DC-DC Power Converter with High-Frequency High-Voltage Transformer Link for High-Power Magnetron Drive

    ISHITOBI Manabu, MYOI Takeshi, SOSHIN Koji, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   124 ( 4 )   352 - 359   2004.4

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    This paper presents a single lossless inductive snubber-assisted ZCS-PFM series resonant DC-DC power converter with a high-frequency high-voltage transformer link for industrial-use high power magnetron drive. The current flowing through the active power switches rises gradually at a turned-on transient state with the aid of a single lossless snubber inductor, and ZCS turn-on commutation based on overlapping current can be achieved in wide range pulse frequency modulation control scheme. The high-frequency high-voltage transformer primary side resonant current always becomes continuous operation mode, by electromagnetic loose coupling design of the high-frequency high-voltage transformer and the magnetizing inductance of the high-frequency high-voltage transformer. As a result, this high-voltage power converter circuit for the magnetron is possible to achieve a complete zero current soft switching under a condition of the broad width gate voltage signals. Furthermore, this high-voltage DC-DC power converter circuit can regulate the output power from zero to full over audible frequency range because of two resonant frequency circuit design. Its operating performances are evaluated and discussed on the basis of the power loss analysis simulation and the experimental results from a practical point of view.

    DOI: 10.1541/ieejias.124.352

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  • Newly-Proposed Hybrid Resonant Commutaion Bridge Leg Link Snubber-Assisted Three-Phase ZVZCS-PWM Soft-Switching Inverter

    HIRAKI Eiji, YOSHIDA Masanobu, HIROTA Yoshihiko, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   124 ( 3 )   286 - 294   2004.3

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    This paper presents the newly-proposed hybrid resonant commutation bridge leg link (HRCB) snubber circuit which can achieve zero voltage and zero current soft-switching commutation for single-phase and three-phase voltage source-type inverter, along with its unique features and operation principle. The circuit parameter design approach for the HRCB snubber circuit and the determination estimating scheme of the gate pulse timing processing which is more suitable and acceptable for single-phase and space voltage vector modulated three-phase voltage source inverter using the HRCB snubber circuit are described in this paper. In particular the three-phase voltage source soft-switching inverter associated with the proposed HRCB circuits are evaluated and discussed from simulation and experimental viewpoint. The practical effectiveness of the HRCB snubber-assisted three-phase voltage source soft-switching inverter using IGBT power modules which is based on the instantaneous space voltage vector modulation is clarified on the output voltage waveform, actual efficiency and electromagnetic noises in comparison with three-phase voltage source-type conventional hard-switching inverter.

    DOI: 10.1541/ieejias.124.286

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  • Static VAR compensator-based terminal voltage regulation scheme of self-excited induction generator driven by variable speed prime mover for clean renewable energy utilizations

    Tarek Ahmed, Eiji Hiraki, Mutsuo Nakaoka, Osamu Noro

    Conference Proceedings - IPEMC 2004: 4th International Power Electronics and Motion Control Conference   3   1219 - 1224   2004

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  • A novel soft switching PWM sinewave converter with regenerative pulse current edge-resonant snubber power modules for distributed power supplies

    Mantaru Nakamura, Tarek Ahmed, Eiji Hiraki, Mutsuo Nakaoka

    IEE Conference Publication   1   203 - 208   2004

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  • New Space Vector Modulated 3-Level 3-Phase Voltage-Source Soft-Switching Inverter with Two Active Resonant DC Link Snubbers

    YAMAMOTO Masayoshi, SATO Shinji, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   123 ( 12 )   1397 - 1405   2003.12

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    This paper presents a novel prototype of 3-level 3-phase voltage-fed soft switching commutation inverter with two Active Auxiliary Resonant DC Link (ARDCL) snubbers which can operate under a condition of Zero Voltage Switching (ZVS) transition. Its operating principle is described herein. The feasible steady-state performances of the proposed soft switching commutated inverter using the latest IGBTs such as planner type and trench type IGBTs, which is more suitable for power systems applications, are evaluated and discussed on the basis of its experimental results and simulation ones.

    DOI: 10.1541/ieejias.123.1397

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  • High-Efficient High Frequency Linked Zero Voltage Soft Switching PWM DC/DC Power Converter with ON/OFF-Assisted Synchronous Rectifier Scheme

    SATO Shinji, MOISSEEV Serguei, ISHITOBI Manabu, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   123 ( 12 )   1414 - 1421   2003.12

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    Advanced development of the high frequency pulse modulated DC/DC power converters are indispensable in order to achieve smaller size, higher performances of the power supplies. In resent years the problems of the electromagnetic noise generation caused by the hard-switching pulse width modulation (PWM)&mdash;based high frequency operation of the switching power devices have been significant, including switching losses and switching surges. As result a variety of soft-switching power conversion circuit technologies have been attracted special interests for reducing switching power losses and minimizing electromagnetic interference. The soft-switching pulse modulation of DC/DC power circuit topologies can be divided into continuous current mode resonant type and quasi-resonant voltage mode type. The soft-switching DC/DC converters, a continuous current mode zero current soft-switching (ZCS) DC/DC converter with pulse frequency modulation (PFM) has been already put into a practical use. In this sort of power converters soft-switching commutation can be achieved over wide load variation ranges and high stability can be also performed, but high current peak stress through power semiconductor devices arises, however, and it causes relatively large increase of conduction power losses in the power semiconductor devices, high frequency transformers as well as rectifier diodes. As a result, the problem of a high efficiency for DC/DC power converter could not still unsolved.<br>Thereupon, in this paper, quasi-resonant voltage mode based soft-switching PWM DC/DC power converter with a high frequency transformer link is presented, which has on/off assisted synchronous rectifier in its secondary side. The PWM operation of this converter is described in comparison with conventional one. Due to using power MOSFET as on/off assisted synchronous rectifier in the secondary side of the high frequency isolated transformer, it is possible to achieve stable zero voltage soft-switching (ZVS) conditions from no load to the rated load for minimum requirement of a magnetizing current. As result of a high value of the magnetizing inductance design, the power converter actual efficiency of this converter can be designed so as to above 97% in experiment. Moreover, results of a switching losses analysis are discussed from an experimental point of views in this paper. The effectiveness of the power converter treated hare is proved from a practical point of view by using 32kHz-2.5kW breadboard setup.

    DOI: 10.1541/ieejias.123.1414

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  • Consideration of Time Sharing Output Pulse Pattern Using Instantaneous Space Voltage Vector Moderation for Three-Phase Voltage Source Soft-Switching Inverter

    YOSHIDA Masanobu, HIRAKI Eiji, NAKAOKA Mutsuo

    The Transactions of the Institute of Electronics, Information and Communication Engineers B   86 ( 11 )   2417 - 2422   2003.11

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  • Performance Evaluations of A Single Inductor Type Resonant AC Link Snubber-Assisted Three-Phase Voltage Source Soft-Switching Inverter

    YOSHIDA Masanobu, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   123 ( 11 )   1269 - 1275   2003.11

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    This paper presents a novel three-phase voltage source type soft-switching inverter using the main and auxiliary IGBT power module packages in order to reduce their switching power losses as well as its electromagnetic noises. A single inductor-assisted resonant AC link snubber circuit as one of some resonant snubbers to achieve the zero voltage soft-switching for the three-phase voltage source inverter (VSI) with instantaneous space voltage vector sinewave modulation strategy is originally demonstrated as compared with the other resonant AC link snubber circuit topologies. In addition to this, its operation principle and unique features are described in this paper for resistive and inductive loads. Furthermore, the practical basic operating performances of the new instananeous space vector modulated soft-switching VSI using IGBT power modules are evaluated and discussed on the basis of power conversion efficiency and electromagnetic conductive and radiative noises from an experimental point of view, as compared with those of hard-switching VSI.

    DOI: 10.1541/ieejias.123.1269

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  • Design Method of Digital Optimal Control Scheme and Multiple Paralleled Bridge Type Current Amplifier for Generating Gradient Magnetic Fields in MRI Systems

    WATANABE Shuji, TAKANO Hiroshi, FUKUDA Hiroya, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   123 ( 8 )   894 - 902   2003.8

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    This paper deals with a digital control scheme of multiple paralleled high frequency switching current amplifier with four-quadrant chopper for generating gradient magnetic fields in MRI (Magnetic Resonance Imaging) systems. In order to track high precise current pattern in Gradient Coils (GC), the proposal current amplifier cancels the switching current ripples in GC with each other and designed optimum switching gate pulse patterns without influences of the large filter current ripple amplitude. The optimal control implementation and the linear control theory in GC current amplifiers have affinity to each other with excellent characteristics. The digital control system can be realized easily through the digital control implementation, DSPs or microprocessors. Multiple-parallel operational microprocessors realize two or higher paralleled GC current pattern tracking amplifier with optimal control design and excellent results are given for improving the image quality of MRI systems.

    DOI: 10.1541/ieejias.123.894

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  • Effective Improvement of DC Busline Voltage Utilization Factor in Two Switch-Auxiliary Quasi-Resonant DC Link Snubber Assisted Three Phase Voltage Source Type Soft-Switching PWM Inverter

    NAGAI Shinichiro, SATO Shinji, YAMAMOTO Masayoshi, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   123 ( 6 )   710 - 716   2003.6

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    In recent years, a resonant snubber to minimize switching power losses and EMI noises have attracted special interest for the voltage-fed soft switching sinewave PWM inverters and active rectifiers. The authors have discussed the performance evaluations on lower noise and high efficiency for two switch auxiliary resonant DC link snubber assisted three-phase voltage-fed soft switching PWM inverter. It was proved that cost effective three phase soft switching inverter treated here is able to improve both efficiency and EMI noise. However, some practical problems to be improved have recognized for the soft-switching three phase PWM inverter treated here from a practical point of view. This three phase soft-switching inverter with two switch type auxiliary resonant DC link snubber has significant disadvantages of DC busline link voltage reduction for the existence of the zero voltage mode transition period as well as the larger size and physical volume of electrolytic capacitor incorporated into the resonant DC link snubber. The additional technology to minimize the busline DC link zero voltage period in order to overcome the practical problems mentioned above is newly proposed in this paper. From experimental and simulation viewpoints, the modified version of this soft-switching inverter is discussed and evaluated for the DC busline voltage utilization factor as compared with the previously developed one.

    DOI: 10.1541/ieejias.123.710

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  • Improved Transient and Steady-State Perfomances of Series Resonant ZCS High-Frequency Inverter-Coupled Voltage Multiplier Converter with Dual Mode PFM Control Scheme

    CHU Enhui, GAMAGE Laknath, ISHITOBI Manabu, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   123 ( 6 )   649 - 659   2003.6

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    The A variety of switched-mode high voltage DC power supplies using voltage-fed type or current-fed type high-frequency transformer resonant inverters using MOS gate bipolar power transistors; IGBTs have been recently developed so far for a medical-use X-ray high power generator. In general, the high voltage high power X-ray generator using voltage-fed high frequency inverter with a high voltage transformer link has to meet some performances such as (i) short rising period in start transient of X-ray tube voltage (ii) no overshoot transient response in tube voltage, (iii) minimized voltage ripple in periodic steady-state under extremely wide load variations and filament heater current fluctuation conditions of the X-ray tube. <BR>This paper presents two lossless inductor snubber-assisted series resonant zero current soft switching high-frequency inverter using a diode-capacitor ladder type voltage multiplier called Cockcroft-Walton circuit, which is effectively implemented for a high DC voltage X-ray power generator. This DC high voltage generator which incorporates pulse frequency modulated series resonant inverter using IGBT power module packages is based on the operation principle of zero current soft switching commutation scheme under discontinuous resonant current and continuous resonant current transition modes. This series capacitor compensated for transformer resonant power converter with a high frequency transformer linked voltage boost multiplier can efficiently work a novel selectively-changed dual mode PFM control scheme in order to improve the start transient and steady-state response characteristics and can completely achieve stable zero current soft switching commutation tube filament current dependent for wide load parameter setting values with the aid of two lossless inductor snubbers. It is proved on the basis of simulation and experimental results in which a simple and low cost control implementation based on selectively-changed dual-mode PFM for high-voltage X-ray DC-DC power converter with a voltage multiplier strategy has some specified voltage pattern tracking voltage response performances under rapid rising time and no overshoot in start transient tube voltage as well as the minimized steady-state voltage ripple in tube voltage.

    DOI: 10.1541/ieejias.123.649

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  • Soft Switching High Frequency PWM Boost Chopper Type DC-DC Converter with High Boost Voltage Conbersion Ratio

    INABA Claudio Y., KONISHI Yoshihiro, HIRAKI Eiji, NAKAOKA Mutsuo

    The Transactions of the Institute of Electronics,Information and Communication Engineers B   86 ( 3 )   599 - 603   2003.3

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  • Two-Paralleled Bridge Type High Frequency PWM Chopper with Multi-Loop Current Feedback Tracking Scheme for Gradient Magnetic Field Controller

    WATANABE Shuji, TAKANO Hiroshi, FUKUDA Hiroya, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   123 ( 3 )   188 - 195   2003.3

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    This paper deals the digital optimal current control scheme to improve MRI (Magnetic Resonant Imaging) Gradient-Magnetic Coil (GC) current control implementation. The GC current needs high precision control specifications so as to take clear images with MRI. The novel MRI-GC current control amplifier has the high-frequency PWM chopper circuit with a multi-parallel input structure. The GC current control circuit can prevent the current ripple amplitude and realize high precision GC current controls, but the control system is hard to design because the GC current control circuit has the multi-input and multi-output structure and required high precision control abilities. Therefore, the digital optimal control scheme has tried to apply for the GC current control. The optimal controller is skillful at the design of multi-input and multi-output systems. The novel controller will actualize the high precision GC current controllability because Error System newly includes the GC current error parameter so as to decide the multi-inputs. In this paper, we discuss the novel controller with computer simulations that it can expect the high precision GC current control to improve the image quality of MRI systems.

    DOI: 10.1541/ieejias.123.188

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  • Active Auxiliary Edge Resonant Commutation Snubbers Assisted Single Phase Sinewave Inverter with New Switching Sequence-based PWM Pattern

    NAKAMURA Mantaro, YAMAZAKI Takayuki, CHANDHAKET Srawouth, AHMED Tarek, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   102 ( 643 )   31 - 36   2003.2

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    This paper presents a new topology of the voltage source bridge inverter circuit which proposes novel active edge resonant snubber circuits using the auxiliary power switches. This inverter is acceptable for an uninterruptible power supply, such as PFC power converter, utility-interactive bi-directional power converter. The soft switching operation principle and design procedure of the active auxiliary edge resonant snubber circuit for the high power applications are described and discussed. Both the main active switches and the auxiliary power switches achieve ZVS or ZCS for this sinewave PWM inverter. In order to minimize the switching surge related electromagnetic noise and the switching power loss of power semiconductor devices used here. This inverter does not need the sensor interfaced circuit to detect the voltage or the current and does not also required for the electrolytic chemical capacitors to make thc neutral point of the DC power supply voltage. Because the power semiconductor switches have the relation of the trade-off evaluations in the switching fall time characteristics and the conductive saturation voltage characteristics, this soft switching inverter can improve efficiency under the conditions of the low saturation voltage.

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  • Performance Evaluations of Dielectric Barrier Discharge Lamp driven by High-Frequency Inverter for Liquid Crystal Backlight

    Fujita Kentarou, Tanimatsu Hiroaki, Gamage Laknath, Muraoka Hidekazu, Hiraki Eiji, Nakaoka Mutsuo

    Proceedings of Annual Conference of The Illuminating Engineering Institute of Japan   36   17 - 17   2003

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    In recent years, the CCFL has been used for Liquid Crystal Backlight in Display. From an environmental recycle point of view, the Dielectric Barrier Discharge (DBD) Lamp has attracted special interest in place of the CCFL, the electric equivalent circuit of this lamp is represented by the diode bridge, voltage source, two capacitor capacitances. The measuring method to determine these circuit parameters is described. The low cost high-efficiency voltage resonance high-frequency inverter with a high frequency transformer which is composed of MOSFETs is introduced in order to drive DBD lamp. The dimming control scheme is based on the pulse density modulation technique.

    DOI: 10.11515/ieijac.36.0.17.0

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  • 共振ACリンクスナバ方式三相電圧形インバータの伝導性・放射性電磁ノイズ評価と検討

    吉田正伸, 平木英治, 中岡睦雄, 篠原貞夫, 古川勝彦

    電気学会全国大会講演論文集   2003 ( 4 )   2003

  • Current-Source Type ZVS-PFM DC-DC Power Converter with High-Frequency High-Voltage Transformer for Magnetron Drive and Its Performance Evaluations

    Ishitobi Manabu, Myoi Takeshi, Hiraki Eiji, Nakaoka Mutsuo

    Journal of the Japan Institute of Power Electronics   29 ( 2 )   48 - 53   2003

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    We have considered a voltage-source type series-resonant ZCS-PFM DC-DC Converter in order to drive an industrial-use magnetron for generating high power microwave in advance. This DC-DC converter can achieve a complete zero current soft switching by assist of the transformer parasitic parameter and a lossless inductive snubber. And the output power is regulated over all power ranges without audible frequency range due to the magnetizing current of the high-frequency transformer. However, this DC-DC converter has a weak point that it is easy to oscillate by the parasitic capacitance of the switching device and the lossless inductive snubber. Therefore in this paper, the new topology that can solve that weak point without hurting good characteristics of that converter is proposed and evaluated on the basis of simulation and experimental results.

    DOI: 10.5416/jipe2003.29.2_48

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  • Utility AC Power Source Connected Sinewave Soft-Switching PWM Inverter with High-Frequency Two-Switch Flyback Transformer Link

    Chandhaket Srawouth, Konishi Yoshihiro, Ogura Kouki, Hiraki Eiji, Nakaoka Mutsuo

    Journal of the Japan Institute of Power Electronics   29 ( 2 )   54 - 61   2003

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    This paper presents two novel prototypes of the utility AC power source connected sinewave inverter using the high-frequency two-switch flyback transformer which is more suitable and acceptable for the small-scale solar photovoltaic and fuel cell generator interfaced power conditioners. The proposed sinewave soft-switching PWM power conditioner with a high-frequency AC link has a function of electrical isolation including sinewave hard-switching PWM power conditioner with a high frequency link, which is considered for solar photovoltaic power conditioner and fuel cell generator related power conditioner from the viewpoints of safety and reliability in total system. The discontinuous conduction mode (DCM) operation of the flyback transformer in this circuit system is also introduced to feature a simple, low-cost and high-efficiency topology of the sinewave inverter circuit and digital control implementation. The operating principle of the proposed sinewave soft-switching PWM inverter circuit as compared with sinewave hard-switching PWM inverter are described for the designing of circuit parameters. Moreover, the digitally controlled sinewave PWM control processing scheme is presented herein. Finally, the sinewave soft-switching PWM inverter prototype is actually built and tested to verify the validity of the proposed power conditioner for new energy generation systems.

    DOI: 10.5416/jipe2003.29.2_54

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  • High-Frequency linked Current type ZVS-PFM Parallel Resonant DC/DC Converter.

    苗井健, 石飛学, GAMAGE L, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-03 ( 25-28.30-36 )   2003

  • 三相電圧形ZVZCS-PWMインバータの特性評価と検討

    吉田正伸, 藤井勇馬, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2003 ( 1 )   2003

  • 昇圧チョッパ型入力段を持つ三相電圧形ソフトスイッチングインバータの電力変換効率推定

    平木英治, 吉田正伸, 中岡睦雄

    電気学会全国大会講演論文集   2003 ( 4 )   2003

  • Experimental Evaluations for ZCS & ZVS assisted Three-Phase Inverter using Novel Auxiliary Resonant Leg Link Sunbbers.

    広田慶彦, 吉田正伸, 平木英治, 中岡睦雄, 篠原貞夫, 古川勝彦

    電気学会半導体電力変換研究会資料   SPC-03 ( 25-28.30-36 )   2003

  • Pulse Density Modulation Controlled Load Resonant High-Frequency Inverters and New Specific Application

    GAMAGE L, 松田樹也, 村岡秀和, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-03 ( 150-152.154-161 )   2003

  • A Three-Phase Sine Wave ZVS-PWM Inverter with New Resonance Snubber

    中村万太郎, 白石和洋, 今村公輔, AHMED T, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-03 ( 134-149 )   2003

  • Electromagnetic Noise Evaluations of Soft Switching PWM Boost Chopper

    小倉弘毅, CHANDHAKET S, AHMED T, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-03 ( 104-110 )   2003

  • ブリッジ形共振ACリンクスナバを用いた三相電圧形インバータと性能評価

    伊与森尚, 吉田正伸, 長井真一郎, 平木英治, 中岡睦雄

    電気学会全国大会講演論文集   2003 ( 4 )   2003

  • Three-phase power module bridge type auxiliary resonant AC link snubber-assisted three-phase soft switching inverter Reviewed

    H Iyomori, S Nagai, M Yoshida, E Hiraki, M Nakaoka

    IECON&apos;03: THE 29TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1 - 3, PROCEEDINGS   2705 - 2710   2003

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  • Small-scale wind turbine coupled single-phase self-excited induction generator with SVC for isolated renewable energy utilization

    T. Ahmed, K. Ogura, K. Soshin, E. Hiraki, M. Nakaoka

    Proceedings of the International Conference on Power Electronics and Drive Systems   1   781 - 786   2003

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    DOI: 10.1109/PEDS.2003.1283003

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  • A sinusoidal pulse width modulated inverter using three-winding high-frequency flyback transformer for PV power conditioner

    S. Chandhaket, Y. Konishi, K. Ogura, E. Hiraki, M. Nakaoka

    PESC Record - IEEE Annual Power Electronics Specialists Conference   3   1197 - 1201   2003

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  • Three-Phase Self-Excited Induction Generator Driven by Variable-Speed Prime Mover for Clean Renewable Energy Utilizations and Its Terminal Voltage Regulation Characteristics by Static VAR Compensator

    Tarek Ahmed, Eiji Hiraki, Mutsuo Nakaoka, Osamu Noro

    Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   2   693 - 700   2003

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  • Practical Power Loss Analysis Simulator Development of Switching Mode Power Converter Using Measured Characteristic Values of Power Semiconductor Devices

    HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   122 ( 12 )   1142 - 1143   2002.12

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    This paper deals with a feasible power loss analysis simulator which can actually estimate the power losses of switching mode power converters using IGBTs. The power loss analysis simulator proposed newly is based upon the feasible measured switching power loss data tables and v-i characteristics data tables of power semiconductor power devices; IGBT and diodes. The effectiveness of practical simulation technique, which can discuss power loss evaluations for three phase PWM inverter, is confirmed from the viewpoints of the newly proposed simulation and experimental results.

    DOI: 10.1541/ieejias.122.1142

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  • Electromagnetic Noise Evaluations of A Novel Resonant AC Link Snubber-Assisted Three-Phase Voltage Source Inverter using Lossless Capacitive Snubber Single Commutation Mode

    YOSHIDA Masanobu, HIRAKI Eiji, NAKAOKA Mutsuo

    電気学会電子デバイス研究会資料   2002 ( 83 )   13 - 18   2002.11

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  • New Switching Sequence-based PWM Pattern of Three Phase Inverter with Active Auxiliary Edge Resonant Commutation Snubber

    NAKAMURA Mantaro, YAMAZAKI Takayuki, AHMED Tarek, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   102 ( 475 )   25 - 30   2002.10

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    This paper proposes a new topology of the voltage source bridge inverter circuit, which has the novel active edge resonant snubber circuit using the auxiliary switches. This inverter is acceptable for an uninterruptible power supply, PFC power converter, utility-interactive bi-directional power converter and so on. In this paper, the soft switching operation principle and design procedure of the active auxiliary edge resonant snubber circuit for high power applications are described and discussed. Both the main active switches and the auxiliary switches achieve ZVS or ZCS in this sinewave PWM inverter. This soft switching PWM inverter can minimize the switching surge related electromagnetic noise and the switching power loss of power semiconductor devices used here. This inverter does not need the sensor interfaced circuit to detect the voltage or the current and does not also required for the electrolytic chemical capacitors to make the neutral point of the DC power supply voltage. Because of the power semiconductor switches have the relation of the trade-off evaluation in the switching fall time characteristic and the conductive saturation voltage characteristic, this soft switching inverter can improve efficiency under conditions of the low saturation voltage.

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  • A Novel Topology of Series Resonant High-Frequency Soft Switching PEM Boost Type Chopper Controlled DC-DC Power Converter

    CHU Enhui, CHANDHAKET Srawouth, MAKAMURA Mantaro, HIRAKI Eiji, NAKAOKA Mutsuo

    The Transactions of the Institute of Electronics,Information and Communication Engineers. C   85 ( 10 )   917 - 924   2002.10

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  • Phase Shifted ZVS-PWM High Frequency Load Resonant Inverter with Active Auxiliary Resonant Switching Block and It's Application

    KUROSE Yoichi, OKUNO Atsushi, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   102 ( 338 )   1 - 5   2002.9

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    This paper presents a novel type of phase shift ZVS-PWM controlled high frequency load resonant inverter with a single active resonant snubber for electromagnetic induction fluid heating appliances. The steady state operating performances of this inverter is evaluated and discussed on basis of simulation and experimental results for induction heater of compact moving fluid heating appliance in the pipeline.

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  • テクノロジー 高効率・低電磁ノイズ高周波スイッチングPWM電力変換装置の開発

    吉田 正伸, 平木 英治, 中岡 睦雄

    EMC   15 ( 4 )   52 - 62   2002.8

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  • Feasible Performance Evaluations of New Single Inductor-Type Auxiliary Resonant AC Link Snubber for Voltage Source Soft Switching Inverter using IGBTs

    YOSHIDA Masanobu, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   122 ( 6 )   617 - 623   2002.6

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    This paper presents a new prototype configuration of a single-phase voltage source soft switching inverter using IGBT power module packages in order to reduce switching power losses, electromagnetic noises. A single inductor-assisted resonant AC link snubber circuit as one of the resonant snubbers to achieve the zero voltage soft switching for the single-phase voltage source inverter is originally demonstrated, and its operation principle and unique features as well as the practical parameter design method of resonant AC link snubber circuit treated here is described on the basis of computer-aided simulation analysis. Furthermore, the practical operating performans of the single inductor-type resonant AC link snubber for the single-phase voltage source soft switching inverter using IGBTs are discussed and evaluated on the basis of switching power losses and electromagnetic conductive noise as compared with those of single-phase voltage source hard switching inverter from an experimental point of view.

    DOI: 10.1541/ieejias.122.617

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  • A Novel Type of DC High-Voltage Power Supply Using Zero Current Soft Switching High-Frequency Inverter for Driving Small Scale Medical Use X Ray Tube

    CHU Enhui, ISHITOBI Manabu, MOISSEEV Serguei, HIRAKI Eiji, NAKAOKA Mutsuo

    The Transactions of the Institute of Electronics,Information and Communication Engineers. C   85 ( 5 )   356 - 366   2002.5

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  • A Novel Type of DC High-Voltage Generator using High-Frequency Series Resonant Inverter for Small Scale X Ray Tube Drive and Its Performance Evaluations

    CHU Enhui, ISHITOBI Manabu, HIRAKI Eiji, NAKAOKA Mutsuo

    The Journal of the Institute of Electrical Installation Engineers of Japan   22 ( 2 )   134 - 143   2002.2

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  • Considerations of Auxiliary Resonant Leg-Link Snubber Operating under ZVS and ZCS Hybrid Commutation for Three Phase Soft Switching Inverter

    Hirota Y., Yoshida M., Hiraki E., Nakaoka M.

    Journal of the Japan Institute of Power Electronics   28   44 - 51   2002

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    In this paper, a novel type of active auxiliary quasi resonant commutation leg link Snubber for three phase soft switching inverter circuit, which can be completely turned on and turned off with ZVS & ZCS hybrid mode transition is presented and discussed. The operating principle of this auxiliary hybrid resonant commutation leg link (AHRCLL) snubber circuit is described, and its optimum circuit parameters are determined from a simulation point of view. In addition to these, the performances of this resonant snubber-assisted three phase voltage source type soft switching inverter are evaluated and discussed on the basis of simulation analysis.

    DOI: 10.14913/jipe1995.28.44

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  • An active auxiliary resonant AC link snubber with a single active power switch for voltage source type soft switching sinewave PWM inverter Reviewed

    H Iyomori, M Yoshida, S Chandhaket, E Hiraki, M Nakaoka

    2002 INTERNATIONAL CONFERENCE ON COMMUNICATIONS, CIRCUITS AND SYSTEMS AND WEST SINO EXPOSITION PROCEEDINGS, VOLS 1-4   1702 - 1706   2002

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  • Space voltage vector modulated three phase inverter using auxiliary pulse current transformer-assisted resonant snubbers

    C. Y. Inaba, S. Sato, S. Nagai, E. Hiraki, M. Nakaoka

    Proceedings of the Power Conversion Conference-Osaka 2002, PCC-Osaka 2002   3   1200 - 1205   2002

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    DOI: 10.1109/PCC.2002.998143

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  • Auxiliary active resonant commutated snubber-assisted 3-level 3-phase voltage source soft-switching inverter

    M. Yamamoto, S. Sato, E. Hiraki, M. Nakaoka

    Proceedings of the Power Conversion Conference-Osaka 2002, PCC-Osaka 2002   3   1245 - 1250   2002

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    DOI: 10.1109/PCC.2002.998151

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  • Space Vector Modulated Three Phase Voltage Source Soft Commutation Inverter with Pulse Current Transformerassisted Active Auxiliary Resonant Commutation Snubbers

    YAMAMOTO H., IWAMOTO H., YOSHIDA M., HIRAKI E., NAKAOKA M.

    IEEJ Transactions on Industry Applications   121 ( 7 )   823 - 824   2001.7

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    This paper presents a three phase voltage source space voltage vector modulated soft switching inverter using bridge leg-side active auxiliary resonant commutation snubbers (ARCS) with a high frequency pulse current transformer which is designed for power regeneration to DC source, along with its performance evaluations under a digital servo control scheme.

    DOI: 10.1541/ieejias.121.823

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  • PWM Power Amplifier with Digital Optimal Preview Current Control Scheme for Gradient Magnetic Field in MRI Systems

    WATANABE Shuji, TAKANO Hiroshi, HIRAKI Eiji, NAKAOKA Mutsuo

    IEEJ Transactions on Industry Applications   121 ( 7 )   756 - 763   2001.7

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    This paper deals with a two-paralleled switch-mode PWM power amplifier using current pattern tracking scheme in order to generate a gradient magnetic field in the Magnetic Resonance Imaging (MRI) system. This power conversion circuit has 8-IGBTs at their inputs/outputs so as to realize further high-power density, and to reduce current switching ripple of the Gradient Coils (GCs) as well as to raise current responses. The modern optimal preview control implementation in 2 parallel bridge type PWM power amplifier can improve the quick and precise current pattern tracking control responses in accordance with the specified values for the magnetic field in GCs. It is clearly proven from a theoretical point of view that the proposed control software is to be enlarged highly the diagnostic target and improves the image quality of MRI systems.

    DOI: 10.1541/ieejias.121.756

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  • Feasible Evaluations of 3-Level 3-Phase Voltage-Fed Soft-Switching Inverter with Two Active Resonant Snubbers

    YAMAMOTO M., HIRAKI E., NAKAOKA M.

    IEEJ Transactions on Industry Applications   121 ( 7 )   821 - 822   2001.7

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    This paper presents a novel type of 3-level 3-phase voltage-fed soft switching inverter with two new Auxiliary Resonant DC Link (ARDCL) snubbers topologies which can operate under a condition of Zero Voltage Switching (ZVS). The feasible operating performances of the proposed soft switching inverter using IGBT module which is more suitable for power systems applications is evaluated on the basis of its experimental results.

    DOI: 10.1541/ieejias.121.821

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  • A Novel Type of Active Auxiliary Resonant Soft Commutation Snubber with Pulse Current Transformer for Voltage Source Inverter and Its Optimum Circuit Design Procedure

    YAMAMOTO H., HIRAKI E., OKUNO A., NAKAOKA M.

    IEEJ Transactions on Industry Applications   121 ( 4 )   522 - 523   2001.4

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    This paper presents a novel prototype of auxiliary resonant commutated snubber (ARCS) which incorporates a high frequency pulse current transformer with power regeneration diode loop, along with its practical design considerations.

    DOI: 10.1541/ieejias.121.522

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  • Three Phase Voltage Source Soft Commutation Inverter with Pulse Current Transformer assisted Active Auxiliary Resonant Commutation Snubber and Its Performance Evaluations.

    山元久明, 平木英治, 中村万太郎, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-01 ( 26-37 )   2001

  • Auxiliary resonant commutated snubber linked 3-level 3-phase voltage source soft-switching inverter

    M. Yamamoto, E. Hiraki, Y. Konishi, M. Nakaoka

    Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   3   1455 - 1460   2001

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  • Practical design procedure of resonant snubber with current transformer and performance evaluations of a digitally controlled three phase soft switching inverter

    C. Y. Inaba, Y. Hirota, Y. Konishi, E. Hiraki, M. Nakaoka

    Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   4   2448 - 2454   2001

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  • Soft-Switching High Frequency Inverter for Electromagnetic Induction Eddy Current-Based Fluid Heating

    KANEDA Mitsuru, HIRAKI Eiji, NAKAOKA Mutsuo, HIROTA Izuo, OMORI Hideki

    IEEJ Transactions on Industry Applications   120 ( 8 )   1088 - 1089   2000.8

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    This paper presents an electromagnetic induction eddy current-based continuous fluid heating appliance using voltage-fed quasi resonant high-frequency soft switching inverter with time ratio control scheme. Its power regulation characteristic are illustrated and this new consumer appliance is evaluated on the basis of its computer simulation and 4kW experimental setup.

    DOI: 10.1541/ieejias.120.1088

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  • Regulated Output Power Estimation of Quasi Resonant Asymmetrical ZVS-PWM High Frequency Inverter for Induction Heating

    KANEDA Mitsuru, HIRAKI Eiji, NAKAOKA Mutsuo, HIROTA Izuo, OMORI Hideki

    IEEJ Transactions on Industry Applications   120 ( 8 )   1086 - 1087   2000.8

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    This paper presents an approximate equation to evaluate the regulated output power of asymmetrical ZVS-PWM high frequency quasi resonant inverter for induction heating. Its approximate output power regulation characteristics derived from a theoretical point of view are discussed for induction heating loads as compared with the simulation results.

    DOI: 10.1541/ieejias.120.1086

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  • 3-Level 3-phase voltage-fed soft-switching inverter with new space voltage vector modulation scheme for dispersed new energy power supply and its feasible evaluations

    M. Yamamoto, E. Hiraki, M. Ando, M. Nakaoka

    2000 IEEE Power Engineering Society, Conference Proceedings   4   2465 - 2470   2000

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    DOI: 10.1109/PESW.2000.847196

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  • Simulation method for DSP-controlled active PFC high-frequency power converters

    S. Mobin, E. Hiraki, H. Takano, M. Nakaoka

    IEE Proceedings: Electric Power Applications   147 ( 3 )   159 - 166   2000

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    DOI: 10.1049/ip-epa:20000375

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  • 3-Level 3-phase voltage-fed soft-switching inverter with new space voltage vector modulation scheme and its feasible evaluations

    M. Yamamoto, H. Iwamoto, E. Hiraki, T. Horiuchi, Y. Sugawara, M. Nakaoka

    IEE Conference Publication   ( 475 )   541 - 547   2000

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    DOI: 10.1049/cp:20000305

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  • Multifunctional digitally-controlled bidirectional three-phase soft-switching PWM converter

    Hisaaki Yamamoto, Claudio Yudi Inaba, Eiji Hiraki, Mutsuo Nakaoka

    IEE Conference Publication   ( 475 )   86 - 90   2000

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    DOI: 10.1049/cp:20000225

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  • Feasible performance evaluations of 3-level 3-phase voltage source soft-switching inverter using IGBT modules

    M. Yamamoto, M. Yoshida, T. Honda, H. Iwamoto, E. Hiraki, S. Sugimoto, I. Kouno, M. Nakaoka

    Proceedings of the International Conference on Power Electronics and Drive Systems   2   1084 - 1089   1999

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    DOI: 10.1109/peds.1999.792859

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  • Performance evaluations of three-phase voltage source instantaneous voltage vector modulated soft commutation inverter with active resonant snubbers in three-phase AC load side

    Masanobu Yoshida, Kouki Ogura, Hideo Iwamoto, Eiji Hiraki, Mutsuo Nakaoka

    IECON Proceedings (Industrial Electronics Conference)   2   903 - 908   1999

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  • Three-phase voltage source NPC soft-switching inverter for interactive energy storage plants

    M. Yamamoto, M. Yoshida, H. Iwamoto, E. Hiraki, S. Sugimoto, I. Kouda, M. Nakaoka

    INTELEC, International Telecommunications Energy Conference (Proceedings)   29 - 21   1999

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  • Voltage-fed NPC soft-switching inverter with new space voltage vector modulation scheme

    M. Yamamoto, E. Hiraki, H. Iwamoto, S. Sugimoto, I. Kouda, M. Nakaoka

    Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   2   1178 - 1185   1999

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  • Novel soft-switching dc-dc power converter with high-frequency transformer secondary-side phase shifted PWM active rectifier

    Takeshi Morimoto, Shinya Shirakawa, Eiji Hiraki, Mutsuo Nakaoka

    INTELEC, International Telecommunications Energy Conference (Proceedings)   5 - 3   1999

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  • Utility-interactive three-phase soft-switching pulse width modulated converter with active resonant snubbers in bridge leg sides for energy storage devices

    Hisaaki Yamamoto, Eiji Hiraki, Yoshihiro Konishi, Katsumi Nishida, Toshikazu Horiuchi, Yoshitaka Sugawara, Mutsuo Nakaoka

    IECON Proceedings (Industrial Electronics Conference)   2   897 - 902   1999

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  • Digitally-controlled three phase soft-switching PFC converter with instantaneous power feedback control scheme

    M. Yamamoto, H. Hattori, E. Hiraki, M. Nakaoka

    PEDES 1998 - 1998 International Conference on Power Electronic Drives and Energy Systems for Industrial Growth   2   1002 - 1006   1998

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    DOI: 10.1109/PEDES.1998.1330738

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  • Object-oriented simulation of DSP controlled three phase active PFC converter

    S. M. Ulhaq, E. Hiraki, M. Nakaoka, H. Takano

    IEE Conference Publication   ( 456 )   28 - 33   1998

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    DOI: 10.1049/cp:19980495

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  • Three phase voltage-fed space vector modulated soft-switching PFC rectifier with instantaneous power feedback scheme

    M. Yamamoto, S. Hattori, E. Hiraki, M. Nakaoka, T. Horiuchi, Y. Sugawara

    IEE Conference Publication   ( 456 )   92 - 98   1998

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    DOI: 10.1049/cp:19980506

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  • IV. Feasible Applications of Resonant Power Conversion Circuit Systems

    NAKAOKA Mutsuo, HIRAKI Eiji

    IEEJ Transactions on Industry Applications   117 ( 2 )   129 - 132   1997.2

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    DOI: 10.1541/ieejias.117.129

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  • High-Frequency Switched Resonant Mode Power Conversion Technologies. Feasible Applications of Resonant Power Conversion Circuit Systems.

    中岡睦雄, 平木英治

    電気学会論文誌 D   117 ( 2 )   1997

  • The State-of-The Art Soft-Switching Power Conversion Technology.

    中岡睦雄, 平木英治

    電気学会全国大会講演論文集   1997 ( 4 )   1997

  • New phase-shifted soft-switching PWM series resonant inverter topologies and their practical evaluations

    Satoshi Nagai, Eiji Hiraki, Yasuhiro Arai, Mutsuo Nakaoka

    Proceedings of the International Conference on Power Electronics and Drive Systems   1   318 - 322   1997

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  • Control implementation Induction Machines System for Supplying the Desired Mechanical Power from Solar Photovoltaic Array

    Izumi Teruyuki, Tamura Keizoh, Hiraki Eiji, Nakaoka Mutsuo

    Journal of the Japan Institute of Power Electronics   21 ( 1 )   91 - 100   1995

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    Solar energy is more attractive and acceptable as one of available power sources in future from a view point of a clean and inexhaustible power supply. However, the electric power generated from a solar photovoltaic array largely depends on weather conditions. Therefore a constant mechanical power can not be obtained from one motor which is driven on the basis of the electric power from a solar photovoltaic array. In order to produce a stable mechanical power, the authors propose the parallel operation system using two induction machines.<br>This paper presents on the stability of the proposed system in which the machine A is related to a solar phtovoltaic array coupled with a general purpose inverter and another machine B is interconnected directly to the utility-grid AC line. It is shown that the system can generate a stable mechanical power with cooperation of the machine B even if the output power of the machine A becomes zero. Furthermore the operating frequency of the inverter is determined by utilizing the relation of the maximum power and the optimal operating voltage of a solar photovoltaic array. As a result, the output power of the machine A becomes always a maximum value under variable weather conditions.

    DOI: 10.14913/jipe1995.21.91

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  • Optimal control of a servo system regenerating conservative energy to a condenser

    Teruyuki Izumi, Prasanna Boyagoda, Mutsuo Nakaoka, Eiji Hiraki

    International IEEE/IAS Conference on Industrial Automation and Control: Emerging Technologies, Proceedings   651 - 656   1995

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MISC

  • Feasibility Study on Fixed-Time Compensation of Control Signal Propagation Delay for Automatic Tuning Assist Circuit in 6.78MHz Wireless Power Transfer System

    西尾颯真, 石原將貴, 梅谷和弘, 平木英治

    電気学会研究会資料(Web)   ( SPC-24-001-017/MD-24-001-017 )   2024

  • Miniaturization of Power Factor Control Circuit for LLC Converter Using Event-Driven Digital Controller

    吉村勇人, 財津俊行, 梅谷和弘, 石原將貴, 平木英治, 堀井一宏

    電気学会研究会資料(Web)   ( HCA-24-010-017 )   2024

  • Two-Phase Interleaved Non-isolated High Step-down Converter with Automatic Current Sharing

    石谷文絵, 石原將貴, 梅谷和弘, 平木英治

    電気学会研究会資料(Web)   ( SPC-24-044-050.052-054/MD-24-044-050.052-054 )   2024

  • Turn-off Surge Suppression Strategy Based on Parasitic Resonance Period in Replace of Power Loop Inductance Reduction

    阿部洸希, 石原將貴, 梅谷和弘, 平木英治

    電気学会全国大会講演論文集(CD-ROM)   2023   2023

  • Exploration of Plate Fins in Forced Air Cooled Heat Sinks with Reduced Thermal Resistance and Pressure Drops

    高力斗亜, 平木英治, 梅谷和弘, 石原將貴

    電気学会全国大会講演論文集(CD-ROM)   2023   2023

  • Design Guideline of Parasitic Inductance for Preventing Oscillatory False Triggering of Two Paralleled GaN-HEMTs Caused by Parallel Oscillation between GaN-HEMTs

    石原將貴, 吉田崚真, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2023   2023

  • Elucidation of the mechanism of the common source inductance of power devices with the kelvin source terminal

    小橋孝太郎, 小西晃央, 梅谷和弘, 石原將貴, 林拓翔, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2023   2023

  • 銅損低減を目的とした正弦波磁束駆動モータの新ロータ形状の提案

    長安希和, 飯田将貴, 石原將貴, 梅谷和弘, 平木英治

    パワーエレクトロニクス学会 第246回定例研究会講演資料   1 - 1   2022.12

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  • ケルビンソース端子を備えた パワーデバイスのコモンソースインダクタンスの測定

    小橋孝太郎, 小西晃央, 石原, 將貴, 梅谷, 和弘, 平木 英治

    パワーエレクトロニクス学会 第246回定例研究会講演資料   1 - 1   2022.12

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  • 銅損低減を目的とした正弦波磁束駆動モータの新ロータ形状の提案

    長安希和, 飯田将貴, 石原將貴, 梅谷和弘, 平木英治

    パワーエレクトロニクス学会 第246回定例研究会講演資料   1 - 1   2022.12

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  • 表面磁石型同期モータのインバータ駆動における相電流波形の提案

    安田裕喜, 楠見隆行, 梅谷和弘, 平木英治

    パワーエレクトロニクス学会 第246回定例研究会講演資料   1 - 1   2022.12

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  • 電気自動車用インバータの高電力密度化 に向けたGaN-HMET実装方法の提案

    竹原佑, 石原將貴, 梅谷和弘, 平木英治

    パワーエレクトロニクス学会 第246回定例研究会講演資料   1 - 1   2022.12

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  • 非接触給電用中継共振器の共振周波数自律調整回路のためのリアクタンス補償量探索範囲を拡張する新制御方式

    小西 晃央, 石原 將貴, 梅谷 和弘, 平木 英治

    パワーエレクトロニクス学会 第245回定例研究会講演資料   1 - 6   2022.10

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  • 小型EV向け高電力密度インバータ実現に向けて低寄生インダクタンス・高放熱性能を両立するためのアルミ基板を用いたGaN-HEMT実装方法の提案—Proposal of GaN-HEMT mounting method using aluminum substrate to achieve both low parasitic inductance and high heat dissipation performance to realize high power density inverter for compact EVs—半導体電力変換/モータドライブ合同研究会・半導体電力変換一般およびモータドライブ

    竹原 佑, 石原 將貴, 梅谷 和弘, 平木 英治

    電気学会研究会資料. MD / モータドライブ研究会 [編]   2022 ( 78-82・84-94・96-106 )   151 - 156   2022.9

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  • Progress of Litz Wire Copper Loss Model for Designing High-Frequency Magnetic Devices

    梅谷和弘, 川原翔太, 石原將貴, 平木英治

    電気学会全国大会講演論文集(CD-ROM)   2022   2022

  • Power Factor Control Based Multiple-Transmitter for Achieving 6.78 MHz Wireless Power Transfer without Cross-Coupling Effects Among Transmitters and Among Receivers

    石原將貴, 松浦晃大, 小西晃央, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2022   2022

  • Development of Self-excited Isolated DC-DC Converter for Gate Driver of High Voltage and High Frequency Power Supply

    枝廣康太, 平木英治, 梅谷和弘, 石原將貴, 河野真吾, 霜村光太

    電気学会産業応用部門大会(CD-ROM)   2022   2022

  • Proposal of GaN-HEMT mounting method using aluminum substrate to achieve both low parasitic inductance and high heat dissipation performance to realize high power density inverter for compact EVs

    竹原佑, 石原將貴, 梅谷和弘, 平木英治

    電気学会研究会資料(Web)   ( SPC-22-143-171/MD-22-078-106 )   2022

  • ハンドウタイ デンリョク ヘンカン/カデン ・ ミンセイ/ジドウシャ ゴウドウ ケンキュウカイ ・ ハンドウタイ デンリョク ヘンカン 、 カデン ミンセイ 、 ジドウシャ ギジュツ イッパン

    ヨシオカ マサヒコ, イシハラ マサタカ, ウメタニ カズヒロ, ヒラキ エイジ

    2021 ( 34・35・37-47 )   19 - 24   2021.12

  • A New Control Method for Resonant Converters Based on Power Factor

    霜村光太, 梅谷和弘, 川上太知, 平木英治

    電気学会研究会資料   2021 ( 45 )   19 - 24   2021.1

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  • AC resistance Measurement Method for IH coil under Heating Operation

    三島知浩, 川原翔太, 梅谷和弘, 平木英治

    電気学会研究会資料   2021 ( 1 )   37 - 42   2021.1

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  • 近接効果を設計する~電力トランス高周波化への挑戦~

    梅谷和弘, 石原將貴, 平木英治

    電気関係学会関西連合大会(Web)   2021   2021

  • Issues in Turn-on Loss Prediction as Seen from the Evaluation of Accuracy of Reverse Recovery Current Prediction of PSpice Diode Model

    吉岡雅彦, 石原將貴, 梅谷和弘, 平木英治

    電気学会研究会資料(Web)   ( SPC-21-166-179/HCA-21-034-047/VT-21-029-042 )   2021

  • Parasitic capacitance design of high-frequency transformer

    小林皓祐, 平木英治, 福本佳樹, 池成達也, 河野真吾

    電気学会全国大会講演論文集(CD-ROM)   2021   2021

  • Phase-Shift Transmitter Control System Achieving ZVS Operation Regardless of Cross-Interference Among Transmitters in Wireless Power Transfer System

    松浦晃大, 石原將貴, 小西晃央, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2021   2021

  • 磁気結合の変動にロバストな磁界結合型ワイヤレス給電用中継共振器の実験的検証

    小西晃央, 藤木啓太, 石原將貴, 梅谷和弘, 平木英治

    電子情報通信学会技術研究報告   119 ( 364(EE2019 49-74)(Web) )   2020

  • Thermal design of three-phase PWM inverter using aluminum core PCB

    Akima Masahiro, Konishi Akihiro, Umetani Kazuhiro, Hiraki Eiji

    Journal of the Japan Institute of Power Electronics   46   114 - 114   2020

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    DOI: 10.5416/jipe.46.114

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  • Suppression control of DC-Link Voltage Fluctuation in Two-Stage AC-DC Converter

    Aoki Ryo, Kusumi Takayuki, Hiraki Eiji, Umetani Kazuhiro

    Journal of the Japan Institute of Power Electronics   46   105 - 105   2020

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    DOI: 10.5416/jipe.46.105

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  • 複数の送電器間に生じる相互干渉を簡易な制御で自動補償可能な磁界結合型ワイヤレス給電システム

    松浦晃大, 石原將貴, 小西晃央, 梅谷和弘, 平木英治

    電子情報通信学会技術研究報告(Web)   120 ( 61(WPT2020 11-14) )   2020

  • Examination of isolation transformer structure of high withstand voltage isolation type converter

    Kobayashi Kosuke, Hiraki Eiji

    Journal of the Japan Institute of Power Electronics   46   115 - 115   2020

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    DOI: 10.5416/jipe.46.115

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  • Novel Heatsink Structure with Fractal Fin Geometry for Improving Heat Dissipation from Power Converters

    池上翔悟, 梅谷和弘, 平木英治, 酒井敏, 東野智

    電気学会全国大会講演論文集(CD-ROM)   2020   2020

  • 負荷変動に対してソフトスイッチングを維持するプラズマ発生器駆動用共振インバータのリアクタンス補償回路の提案

    白石達也, 梅谷和弘, 平木英治, 池成達也, 福本佳樹

    電子情報通信学会技術研究報告   119 ( 364(EE2019 49-74)(Web) )   2020

  • Resonant inductive coupling wireless power transfer systems operating at 6.78MHz with automatic compensator against magnetic coupling variation for transmitter and resonator

    藤木啓太, 小西晃央, 三島知浩, 石原將貴, 梅谷和弘, 平木英治

    電気学会全国大会講演論文集(CD-ROM)   2020   2020

  • The Latest High Frequency Power Conversion Technology for Adapting to Advance of Energy Use

    勝嶋肇, 橘秀久, 川端龍哉, 安部征哉, 石川裕記, 入江寿一, 宇敷修一, 江口政樹, 大森英樹, 笠展幸, 木船弘康, 栗尾信広, 近藤亮太, 斉藤亮治, 佐藤宣夫, 庄司浩幸, 谷口勝則, 玉田俊介, 津野眞仁, 弦田幸憲, 寺園勝志, 中岡睦雄, 西村和則, 服部将之, 早川潔, 平木英治, 平地克也, 北條昌秀, 堀恵輔, 枡川重男, 松井景樹, 三浦友史, 三島智和, 南政孝, 守屋一成, 山村直紀, 吉澤仁, 米森秀登, 高田知明

    電気学会技術報告   ( 1473 )   2020

  • Development of novel thin coil for induction cooker leading to practical application

    三島知浩, 搆口晃希, 白川知秀, 梅谷和弘, 平木英治, 黒瀬洋一, 定方秀樹, 藤田篤志

    電気学会研究会資料   2019 ( 26 )   71 - 76   2019.12

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  • Accuracy Evaluation of Switching Waveform Considering Effective Parasitic Inductance on PCB and Static Characteristics of Power Device

    古木健悟, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2019   2019

  • Research Group Introduction: Electric Power Conversion System Engineering Laboratory, Graduate School of Natural Science and Technology, Okayama University

    IEEJ Transactions on Industry Applications   139 ( 6 )   NL6_8 - NL6_8   2019

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    <p>Our laboratory focuses on a variety of electric power systems based on power electronics and super conductivity. Further details are found on our laboratory's Web-site (http://www.ec.okayama-u.ac.jp/~epc/).</p>

    DOI: 10.1541/ieejias.139.NL6_8

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  • Copper loss reduction for Plate Shape One Turn Coil in High Step-Down Center-Tapped rectifier Tomohide Shirakawa*, Kazuhiro Umetani*, Eiji Hiraki

    Shirakawa Tomohide, Umetani Kazuhiro, Hiraki Eiji

    Journal of the Japan Institute of Power Electronics   45   121 - 129   2019

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    In order to reduce copper loss, high step-down DC-DC converter often employs center-tapped rectifier. In addition, a plate shape one turn coil is utilized for transformer for making a high step-down ratio. We focused on the proximity effect in plate shape one turn coil, and investigate the cause of worsening the copper loss. In this paper, based on this investigation, we propose rectification method using winding integrated with rectifier. In addition, we discuss practical issues of the proposed method and present the solution strategy. The proposed method is verified by experiments, which suggests the effectiveness of the proposed method to high current applications.

    DOI: 10.5416/jipe.45.121

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  • Multiple-receiver Resonant Inductive Coupling Wireless Power Transfer System with Automatic Compensation Circuit of Cross-Coupling between Receivers

    石原將貴, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2019   2019

  • トランスの漏れインダクタンスの分布がフライバックコンバータの損失に与える影響

    中川航輔, 白川知秀, 梅谷和弘, 平木英治

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   70th   2019

  • Conference Report: International Telecommunications Energy Conference 2017 (INTELEC 2017), October 22-26, 2017, Gold Coast, Australia

    IEEJ Transactions on Industry Applications   138 ( 4 )   NL4_9 - NL4_9   2018

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    DOI: 10.1541/ieejias.138.NL4_9

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  • 中国支部における最近の活動状況

    平木 英治

    電気学会誌   138 ( 8 )   557 - 557   2018

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    <p>はじめに</p><p>2018年4月25日(水)に,中国支部新旧役員会および活動報告会が開催され,2017年度の支部活動を総括した。これを受けて,本稿では,中国支部の最近の活動状況を紹介する。</p>

    DOI: 10.1541/ieejjournal.138.557

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  • 中国支部だより 岡山大学大学院自然科学研究科 電力変換システム工学研究室

    平木 英治

    電気設備学会誌   38 ( 12 )   746 - 747   2018

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    DOI: 10.14936/ieiej.38.746

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  • Derivation of Phase Current Profile and Reluctance Profile Which Suppress Source Current Ripple and Torque Ripple of Switched Reluctance Motors for Electric Vehicle Propulsion Motors

    楠見隆行, 原拓斗, 梅谷和弘, 平木英治

    電気学会静止器研究会資料   2017 ( 98 )   71 - 76   2017.9

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  • Design and Validation of the Induction Heating Coil for Selective Heating the Metal Foil

    長谷拓朗, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2017   2017

  • Novel Calorimetric Method for Measuring Power Loss of Magnetic Components for High Frequency Converters: Measurement for Temperature Characteristics of Magnetic Components Loss

    白川知秀, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2017   2017

  • Improvement in Simulation Accuracy of Switching Loss in Consideration of Common Source Inductance

    小西晃央, 相川恭汰, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2017   2017

  • Experimental Verification of Compact Bi-directional Isolated Converter Using Integrated Magnetic Component for Electric Vehicle

    大畑奨真, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2017   2017

  • Verification of Resonance Frequency Tracking Operation Principle with Phase Shift Control for Receiving Circuit of Magnetic Resonance Type Wireless Power Transmitting.

    西海賢二, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2017   2017

  • 種々の分散電源に対応するDC/AC変換回路技術の動向

    三浦友史, 石川裕記, 江口政樹, 服部将之, 平木英治, 北條昌秀, 松井景樹

    電気学会産業応用部門大会(CD-ROM)   2017   2017

  • 磁界共振結合型ワイヤレス給電システムにおけるSS方式とSP方式の準双対性の解析

    石原將貴, 梅谷和弘, 平木英治, 山本真義

    電気学会産業応用部門大会(CD-ROM)   2016   2016

  • アルミ鍋に発生する浮上力抑制を目的としたアキシャル型IHクッキングヒータ

    岡 洋平, 梅谷 和弘, 平木 英治

    パワーエレクトロニクス学会誌   42   149 - 149   2016

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    DOI: 10.5416/jipe.42.149

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  • 並列インダクタ接続型プラズマ発生用共振型インバータの実証評価

    板倉康仁, 掛水浩晃, 中井戸博樹, 梅谷和弘, 平木英治, 池成達也, 河野真吾

    電気学会産業応用部門大会(CD-ROM)   2016   2016

  • GaN-FETの連鎖的誤動作を抑制するためのソース端子のインダクタンスを考慮した配線インダクタンス設計指針

    松本隆之介, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2016   2016

  • 基板実装したMOSFETのソース寄生インダクタンスの測定法

    相川恭汰, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2016   2016

  • Optimization of the load impedance for maximizing the output power in a magnetic coupling wireless power transfer system with dual resonators

    小山貴大, 梅谷和弘, 平木英治

    電気学会電子デバイス研究会資料   2015 ( 146 )   79 - 84   2015.10

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  • スイッチング波形の予測精度向上に向けたSPICEモデルの課題抽出

    相川恭汰, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2015   2015

  • 交流電源にインタフェースされるパワーエレクトロニクス回路技術の動向-低ノイズ化技術-

    平木英治, 黒川不二雄, 船渡寛人, 吉田正伸, 斎藤真, 西田保幸

    電気学会産業応用部門大会(CD-ROM)   2015   2015

  • 平滑インダクタの一体化による三相PFC コンバータの小型化技術の提案

    中井戸 博樹, 梅谷 和弘, 平木 英治

    パワーエレクトロニクス学会誌   41   160 - 160   2015

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    DOI: 10.5416/jipe.41.160

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  • 熱量計測に基づいた絶縁コンバータ用高周波トランスの損失測定法

    白川知秀, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2015   2015

  • ソフトスイッチング適用によるプラズマ発生用高周波インバータの半導体素子損失低減効果の検討

    掛水浩晃, 梅谷和弘, 平木英治, 河野真吾, 福本佳樹

    電気学会産業応用部門大会(CD-ROM)   2015   2015

  • SRMのモデル化に向けた鉄損の電気角依存性評価

    楠見隆行, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2015   2015

  • 解析力学を用いた新規等価回路表現に基づく磁界共鳴型と電界共鳴型ワイヤレス給電システムの力学的等価性の解析

    梅谷和弘, 梅上大勝, 平木英治, 山本真義

    電気学会産業応用部門大会(CD-ROM)   2015   2015

  • 太陽光発電システムの出力低下とストリングコンバータによる改善効果の検討

    中井戸博樹, 吉田正伸, 藤原憲一郎, 梅谷和弘, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2015   2015

  • Improvement of WPT efficiency for ornamental robot fish and its future application to capsule endoscopes

    ITO Ryuji, SAWAHARAHO Yuichi, ISHIZAKI Toshio, YOSHIZAWA Keisuke, HIRAKI Eiji, AWAI Ikuo

    電子情報通信学会技術研究報告   114 ( 375 )   9 - 14   2014.12

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    In our research group, wireless power transfer for robot fish in an aquarium has been studied. This system can be diverted to WPT for the capsule endoscope. Therefore, optimization of receiving resonator of wireless power supply system to the ornamental robot fish, high-efficiency switching power supply leads to application to the capsule endoscope. The high dielectric constant and high-loss of the human body together with spatial non-uniformity of the magnetic field hamper the application of WPT system in addition to the strong demand for safety. We will clarify those challenges in order to solve the problem for the practical application.

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  • Relation between Switching Power Source and Power Transfer Portion in a WPT System for Robot Fish in Aquarium

    ITO Ryuji, SAWAHARA Yuichi, ISHIZAKI Toshio, YOSHIZAWA Keisuke, HIRAKI Eiji, AWAI Ikuo

    電子情報通信学会技術研究報告   114 ( 310 )   49 - 54   2014.11

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    In our research group, wireless power transfer for robot fish in an aquarium has been studied. By designing the total WPT system from the power source to the load and elucidating each design procedure, we discuss new important issues such as the selection of transfer mode or the condition for the input impedance of the WPT system for soft switching operation of the switching power supply.

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  • 三相4線式配電用ALBの変換器容量の検討

    久田佳大, WIN Tint Soe, 田中俊彦, 平木英治, 岡本昌幸, LEE Seong Ryong

    電気学会全国大会講演論文集(CD-ROM)   2014   2014

  • 電流平衡機能と無効電力調整機能を有するPV発電用PCS

    脇本貴章, 平木英治, 田中俊彦, 岡本昌幸, 川原耕治

    電気学会全国大会講演論文集(CD-ROM)   2014   2014

  • 負荷側有効電力演算が不要な電気自動車用スマートチャージャの無効電力調整法

    田中秀典, 田中俊彦, 岡本昌幸, 平木英治

    電気学会全国大会講演論文集(CD-ROM)   2014   2014

  • 水中負荷への応用を目的とした非接触給電用高周波インバータ

    吉澤圭祐, 山田洋明, 田中俊彦, 平木英治, 岡本昌幸

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   65th   2014

  • Trial Calculation of Power Generation Costs for Mega-Solar Power Plants by the Published Generation Data at Fukuyama Photovoltaic Power Plant

    TAKUNO Kazuhiro, HIRAKI Eiji, TANAKA Toshihiko, OKAMOTO Masayuki

    Technical report of IEICE. Energy engineering in electronics and communications   113 ( 60 )   81 - 86   2013.5

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    Fukuyama photovoltaic (PV) power plant constructed by the Chugoku Electric Power Company, Incorporated has been on commercial since December, 2011. The rated power is 3MW. The detail generated power and the availability factor are published on the Web site of Fukuyama PV power plant at regular intervals. This paper aims at trial calculation of power costs for a mega-solar power plant using the data published on the Web site of Fukuyama PV power plant. The mean value of the availability factor is 17.3% at Fukuyama PV power plant while the mean value is 12% in Japan. It is concluded that the weather conditions of the Setouchi region are more suitable the PV power plant from the economic point of view.

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  • 直列共振型マルチ出力高周波インバータの出力制御特性

    田中裕高, 平木英治, 田中俊彦, 岡本昌幸

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   64th   2013

  • ノーマリオンGaN HEMT用共振形ゲートドライブ回路

    石橋卓治, 平木英治, 田中俊彦, 岡本昌幸, 橋詰保, 岡本昌幸, 橋詰保

    電気学会産業応用部門大会(CD-ROM)   2013   2013

  • 磁界共鳴型非接触給電用高周波駆動GaNインバータ

    吉澤圭祐, 平木英治, 田中俊彦, 岡本昌幸

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   64th   2013

  • プラスチック中における微小金属の高周波誘導加熱手法

    山本直樹, 平木英治, 田中俊彦, 山田幸治, 長尾達也, 三宅泰弘, 野田勇二郎

    電気学会産業応用部門大会(CD-ROM)   2013   2013

  • 三相AC-ACダイレクトコンバータにおける負荷等価回路の検討

    松井光生, 平木英治, 田中俊彦, 岡本昌幸

    電気学会産業応用部門大会(CD-ROM)   2013   2013

  • ノーマリオン形GaN HEMT用共振形ゲートドライブ回路の実験的検証

    石橋卓治, 平木英治, 田中俊彦, 岡本昌幸, 岡本昌幸, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気学会全国大会講演論文集   2013 ( 4 )   2013

  • マルチ出力可能なIHクッキングヒータ用高周波インバータ

    廣川貴之, 平木英治, 田中俊彦, 今井慎, 安井健治, 住吉眞一郎

    電気学会全国大会講演論文集   2013 ( 4 )   2013

  • 福山太陽光発電所の公開発電データを用いたメガソーラ発電所の発電コストの試算

    宅野和大, 平木英治, 田中俊彦, 岡本昌幸

    電気学会全国大会講演論文集   2013 ( 7 )   2013

  • エネルギー利用を想定した特徴的な電力変換回路

    寺園勝志, 入江寿一, 村上哲, 荻原弘之, 木船弘康, 平木英治, 三島智和, 斉藤亮治, 米森秀登

    電気学会産業応用部門大会(CD-ROM)   2013   2013

  • 無効電力調整によるPV発電導入時の電圧上昇抑制法

    脇本貴章, 平木英治, 田中俊彦, 川原耕治, 岡本昌幸

    電気学会産業応用部門大会(CD-ROM)   2013   2013

  • 変換器容量低減を目的とした電気自動車用スマートチャージャの制御法

    田中秀典, 脇本貴章, 平木英治, 田中俊彦, 岡本昌幸

    電気学会全国大会講演論文集   2013 ( 4 )   2013

  • 変換器容量低減を目的とした電気自動車用スマートチャージャの制御法

    田中秀典, 脇本貴章, 平木英治, 田中俊彦, 岡本昌幸

    電気学会産業応用部門大会(CD-ROM)   2013   2013

  • 微小金属の高周波誘導加熱手法の検討

    山本直樹, 平木英治, 田中俊彦, 山田幸治, 長尾達也, 三宅泰弘

    電気学会全国大会講演論文集   2013 ( 4 )   2013

  • 戸建てシェルタ用ユビキタス電源

    乗安信一, 加藤慶一, 平木英治, 田中俊彦, 小金井真, 三浦房紀, 岡本昌幸

    電気学会全国大会講演論文集   2013 ( 7 )   2013

  • 非同期絶縁型双方向dc-dcコンバータの制御特性

    岩田啓, 穐吉啓史, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2013 ( 4 )   2013

  • A New Control Strategy Based on the Internal Model Principle for Current Balancer in Single-Phase Three-Wire Distribution Systems

    BABA Yusuke, WAKASA Yuji, HIRAKI Eiji, TANAKA Toshihiko, OKAMOTO Masayuki

    電気学会半導体電力変換研究会資料   112 ( 167 )   69 - 74   2012.7

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  • Feasible Verification of a High-Frequency link AC-AC Converter for Non-contact Power Supply System in Parking Towers

    KAWANO Shingo, HIRAKI Eiji, TANAKA Toshihiko, OKAMOTO Masayuki

    Technical report of IEICE. Energy engineering in electronics and communications   112 ( 167 )   15 - 20   2012.7

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    In this paper, feasible verification of a high-frequency link AC-AC converter for non-contact power supply system is described. The proposed converter has very simple circuit configuration compared with the conventional systems. Excellent load characteristics and power conversion efficiency were obtained from the experimental verification.

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  • A High-Speed Switching Normally-on GaN HEMT

    石橋卓治, 豊田玄紀, 平木英治, 田中俊彦, 岡本昌幸, 岡本昌幸, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気学会半導体電力変換研究会資料   2012 ( 17 )   29 - 34   2012.6

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  • A Control Method of the Peak Power Shaver for the Electric Injection Molding Machines

    穐吉啓史, 平木英治, 田中俊彦, 岡本昌幸, 松尾忠義, 越智清史

    電気学会半導体電力変換研究会資料   2012 ( 17 )   75 - 80   2012.6

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  • The optimal design procedure of a single-phase high frequency AC-AC direct converter

    MATSUI Koki, HIRAKI Eiji, TANAKA Toshihiko, OKAMOTO Masayuki

    Technical report of IEICE. Energy engineering in electronics and communications   2012 ( 17 )   41 - 46   2012.5

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    In recent years, high frequency induction heating has been applied to an industrial applicable field, especially on the fluid heating, such as super heated steamer. This paper presents the optimal design procedure of a single-phase high frequency AC-AC direct converter for industrial IH system providing wide soft switching operation area. The experimental results demonstrate the validity of the proposed design procedure.

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  • NE Academy : Understanding "Magnetic Resonance" Wireless Power Transfer Technologies (Final Installment)

    ( 1076 )   100 - 110   2012.2

  • マルチレベルインバータを用いた無効電力補償装置の新しい制御法

    伊藤北斗, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2012 ( 4 )   2012

  • 無効電力と不平衡有効電力補償機能を有する電気自動車用スマートチャージャ

    田中秀典, 平木英治, 田中俊彦, 岡本昌幸

    電気学会産業応用部門大会(CD-ROM)   2012   2012

  • 同期モータ駆動システムシミュレータによる損失推定

    平岡崇, 平木英治, 田中俊彦, 岡本昌幸

    電気学会産業応用部門大会(CD-ROM)   2012   2012

  • IH応用を目的としたチャージブースト型フルブリッジ高周波インバータのDCバスライン電圧算出法

    田中裕高, 平木英治, 田中俊彦, 岡本昌幸

    電気学会産業応用部門大会(CD-ROM)   2012   2012

  • 家電分野における商用電源インターフェイス技術動向

    芳賀仁, 岩谷一生, 黒川不二雄, 住吉眞一郎, 平木英治

    電気学会産業応用部門大会(CD-ROM)   2012   2012

  • IHクッキングヒータ用時分割制御高周波インバータの実証評価

    廣川貴之, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2012 ( 4 )   2012

  • 新開発GaN HEMTを用いたインバータ回路

    豊田玄紀, 岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気学会全国大会講演論文集   2012 ( 4 )   2012

  • 立体駐車場非接触給電システム用高周波リンクAC-ACコンバータの実験的検証

    河野真吾, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2012 ( 4 )   2012

  • 正弦波PWMインバータのロバスト制御器設計法の実験的検証

    馬場雄介, 若佐裕治, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2012 ( 4 )   2012

  • 無効電力と不平衡有効電力補償機能を有する電気自動車用スマートチャージャ

    田中秀典, 関谷司, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2012 ( 4 )   2012

  • 新開発GaN HEMTのスイッチング特性

    石橋卓治, 岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気学会全国大会講演論文集   2012 ( 4 )   2012

  • 戸建てシェルタ用ユビキタス電源

    加藤慶一, 平木英治, 田中俊彦, 小金井真, 三浦房紀, 岡本昌幸

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   63rd   2012

  • ノーマリオン形GaN HEMT用共振形ゲートドライブ回路

    石橋卓治, 豊田玄紀, 平木英治, 田中俊彦, 岡本昌幸, 岡本昌幸, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   63rd   2012

  • 福山太陽光発電所の発電データの検証

    宅野和大, 平木英治, 田中俊彦, 岡本昌幸, 庄野弘高

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   63rd   2012

  • A Smart Charger for Electric Vehicles with Power Quality Controller

    TANAKA Hidenori, SEKIYA Tsukasa, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko

    Technical report of IEICE. Energy engineering in electronics and communications   111 ( 305 )   25 - 29   2011.11

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    This paper proposes a smart charger for elecrtic vehicles, which can compensate reactive and unbalanced active powers. In the proposed smart charger, three-leg IGBTs are used for PWM rectifier. The fourth-leg performs a bidirectional chopper. The proposed smart charger can compensate the reactive and unbalanced active currents on the secondary-side of the pole-mounted distribution transformer using the constant de-capacitor voltage control, which are commonly used in active power line conditioner. The basic principle of the proposed control method is discussed in detail. The validity and excellent practicability of the proposed smart charger are confirmed by digital computer simulation using PSIM software.

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  • A new control method of half-bridge inverters based current balancer with a power de-coupler in single-phase three-wire distribution systems

    BABA Yusuke, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko

    IEICE technical report   111 ( 161 )   37 - 42   2011.7

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  • A New V-connection Inverter with the Reduced-Capacity DC Capacitors for DC Micro-Grid

    PAK Seonyeong, BABA Yusuke, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko

    2011 ( 1 )   23 - 27   2011.1

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  • 高い降圧比を有するインダクタ結合形DC-DCコンバータにおける出力電圧リプルの低減

    渡辺潤, 岡本昌幸, 平木英治, 田中俊彦

    電気学会家電・民生研究会資料   HCA-11 ( 13-21 )   2011

  • 移動平均フィルタを用いた三相PLL

    穐吉啓史, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   62nd   2011

  • Add-on式回生エネルギー回収装置を用いた電動射出成型機の電力ピークカット効果

    穐吉啓史, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2011 ( 4 )   2011

  • 戸建てシェルタへの応用を目的としたDGマイクログリッドを中核とするユビキタスパワーの構築

    加藤慶一, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2011 ( 7 )   2011

  • GaN HEMTのスケールアップモデルとスイッチング特性

    豊田玄紀, 豊田玄紀, 岡本昌幸, 岡本昌幸, 平木英治, 平木英治, 田中俊彦, 田中俊彦, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気学会産業応用部門大会(CD-ROM)   2011   2011

  • 高周波誘導加熱用時分割制御高周波インバータのシミュレーションによる動作解析

    廣川貴之, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2011 ( 4 )   2011

  • 大規模災害対応早期設置型戸建シェルタへの応用を目的としたユビキタスパワー

    加藤慶一, 岡本昌幸, 平木英治, 田中俊彦, 小金井真, 三浦房紀

    電気学会産業応用部門大会(CD-ROM)   2011   2011

  • 絶縁型双方向DC-DCコンバータにおける電圧振動低減法

    平生和雅, 岡本昌幸, 平木英治, 田中俊彦

    電気学会産業応用部門大会(CD-ROM)   2011   2011

  • スイッチング損失の低減を目的としたIHクッキングヒータ用時分割制御高周波インバータ

    廣川貴之, 岡本昌幸, 平木英治, 田中俊彦, 中岡睦雄

    電気学会産業応用部門大会(CD-ROM)   2011   2011

  • 立体駐車場非接触給電システムにおける非接触トランスの検討

    河野真吾, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   62nd   2011

  • 産業用高周波誘導加熱を目的とした三相AC-ACダイレクトコンバータの実験的検証

    高原貴昭, 岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 加地徹

    電気学会全国大会講演論文集   2011 ( 4 )   2011

  • オールディジタル制御三相無効電流発生装置

    橋本覚, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2011 ( 4 )   2011

  • GaN横型トランジスタのモデル化とAC-ACダイレクトコンバータへの応用

    豊田玄紀, 岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気学会全国大会講演論文集   2011 ( 4 )   2011

  • 非接触給電用アクティブクランプ高周波リンクAC-ACコンバータの動作特性

    河野真吾, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2011 ( 4 )   2011

  • パワーデカップリング機能を有する単相三線式配電用電流バランサの制御法

    馬場雄介, 岡本昌幸, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2011 ( 4 )   2011

  • Shading and electrical features of a photovoltaic array mounted inside the roof of an east-west oriented greenhouse Reviewed

    A. Yano, M. Kadowaki, A. Furue, N. Tamaki, T. Tanaka, E. Hiraki, Y. Kato, F. Ishizu, S. Noda

    Biosystems Engineering   106 ( 4 )   367 - 377   2010.8

  • Analysis of a Buck Type DC-DC Converter with a Coupled Inductor

    WATANABE Jun, OKAMOTO Masayuki, HIRAKI Eiji, TANAKA Toshihiko

    IEICE technical report   2010 ( 99 )   105 - 110   2010.7

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    In recent years, the supply voltage of ICs (Integrated Circuit) tends to be lower. So high-step-down voltage ratio is required to a DC-DC converter on nearby ICs. This paper presents a buck type DC-DC converter with a coupled inductor which enables high-step-down voltage ratio as well as decreasing the voltage and current peak of the power devices. The basic performance analysis of the proposed DC-DC converter is demonstrated and evaluated from a simulated and experimental results.

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  • Constant DC Voltage Control Based Strategy for an Active Power Quality Compensator in Electrified Railways with Improved Response

    ISHIBASHI Keisuke, ISHIKURA Norio, HIRAKI Eiji, TANAKA Toshihiko

    電気学会電力技術研究会資料   2010 ( 34 )   23 - 28   2010.3

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  • A Half-Bridge Inverter Based Current Balancer for Single-Phase Three-Wire Distribution Feeders with a DC Voltage Balancer

    SUGAHARA Kazuya, HIRAKI Eiji, TANAKA Toshihiko

    電気学会電力技術研究会資料   2010 ( 34 )   41 - 46   2010.3

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  • DCマイクログリッド用単相3線式インバータの一構成法

    関谷司, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2010 ( 4 )   2010

  • 省エネシステムとスイッチング回路技術(1)-家電分野-

    宇敷修一, 荻原弘之, 木船弘康, 庄司浩幸, 谷口勝則, 平木英治, 安井健治, 渡辺晴夫

    電気学会産業応用部門大会講演論文集   2010 ( 1 )   2010

  • IHクッキングヒータ用チャージブースト型2出力フルブリッジインバータの特性評価

    銭谷紳, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2010 ( 4 )   2010

  • 直流電圧平衡化回路を有する単相三線式配電用電流バランサ

    馬場雄介, 菅原和也, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2010 ( 4 )   2010

  • 三相商用AC-高周波ACダイレクトコンバータに用いる三相誘導加熱負荷の試作と動作解析

    高原貴昭, 平木英治, 田中俊彦, 橋詰保, 加地徹

    電気学会全国大会講演論文集   2010 ( 4 )   2010

  • 絶縁型双方向DC-DCコンバータのスイッチング素子の電流ピーク低減

    平生和雅, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2010 ( 4 )   2010

  • ソフトスイッチングPFCコンバータへのSiC-SBD導入による高効率化の検証

    河口祐樹, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2010 ( 4 )   2010

  • PSPICEによるGaNパワーMOSFETのスイッチング特性解析

    岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 加地徹, 岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 加地徹

    電気学会産業応用部門大会講演論文集   2010 ( 1 )   2010

  • 双方向チョッパと単相PWM整流器を用いた大容量EDLCシミュレータ

    田中敦士, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2010 ( 4 )   2010

  • 非接触給電用高周波電力変換回路

    河野真吾, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   61st   2010

  • 直流電圧平衡化回路を有するハーフブリッジインバータを用いた単相三線式配電用電流バランサ

    馬場雄介, 菅原和也, 岡本昌幸, 平木英治, 田中俊彦

    電気学会産業応用部門大会講演論文集   2010 ( 1 )   2010

  • 無効電流発生装置のオールディジタル制御化

    橋本覚, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   61st   2010

  • PSpiceを用いたGaN横型トランジスタのデバイスモデル作成

    豊田玄紀, 岡本昌幸, 平木英治, 田中俊彦, 橋詰保, 橋詰保, 加地徹, 加地徹

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   61st   2010

  • DCマイクログリッド用単相3線式インバータの一構成法

    関谷司, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   61st   2010

  • 誘導加熱用時分割制御高周波インバータ

    廣川貴之, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   61st   2010

  • 独立型太陽光発電システム用バッテリ充放電状態監視システム

    彼杵祐子, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   61st   2010

  • DCマイクログリッドを中核とするユビキタスパワーの構築

    加藤慶一, 岡本昌幸, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   61st   2010

  • Output Characteristics of Soft Switching AC to High Frequency AC Direct Converter with PFC Function for Industrial IH Application

    TAKAHARA Takaaki, HIRAKI Eiji, TANAKA Toshihiko

    電気学会半導体電力変換研究会資料   2009 ( 109 )   7 - 12   2009.7

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  • An Easy Add-on Energy Recovery System for Motor Drive Systems

    TAKAHASHI Keisuke, HIRAKI Eiji, TANAKA Toshihiko, MATSUDA Tetsuo

    IEICE technical report   109 ( 156 )   7 - 12   2009.7

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    The regenerative energy from the motor drive systems used in the injection molding is consumed by resistors connected on the DC bus of the inverters. Recently the recovery systems of this regenerative energy with a bi-directional DC-DC converter and capacitors have been developed. Most literatures deal with the circuit topologies, and there are very few researches considering the energy efficiency as long as the authors know. In this paper a new control strategy of the EDLC based energy recovery system is proposed. The basic principle of the proposed control strategy and the power losses consumed in the energy recovery system are discussed in detail. Digital computer simulation is implemented using the PSIM software. Digital computer simulation results demonstrate that the consumed power by the injection molding is improved by 51%.

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  • Electrical energy generated by photovoltaic modules mounted inside the roof of a north-south oriented greenhouse Reviewed

    A. Yano, A. Furue, M. Kadowaki, T. Tanaka, E. Hiraki, M. Miyamoto, F. Ishizu, S. Noda

    Biosystems Engineering   103 ( 2 )   228 - 238   2009.6

  • BS-7-3 Demand Area Power System and High Quality Electric Power Distribution

    Omura Yasushi, Hiraki Eiji, Tanaka Toshihiko

    Proceedings of the IEICE General Conference   2009 ( 2 )   "S - 93"-"S-94"   2009.3

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  • Newly-Developed HB High Frequency Inverter using One Diode Conducting ZCS-AF-PFC FB Rectifier

    SUGIMURA Hisayuki, SUMIYOSHI Shinichiro, MUN Sang-Pil, MISHIMA Tomokazu, HIRAKI Eiji, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   2009 ( 1 )   57 - 62   2009.1

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  • A Novel Constant Frequency Asymmetrical PWM-Controlled Soft-Switching Half-Bridge DC-DC Converter

    MISHIMA Tomokazu, HIRAKI Eiji, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   2009 ( 1 )   49 - 55   2009.1

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  • DSP評価ボードを用いたPWM整流回路の試作

    徳永翔平, 田中俊彦, 平木英治

    電気関係学会関西支部連合大会講演論文集(CD-ROM)   2009   2009

  • 家庭用IH調理器への応用を目的としたソフトスイッチングPFCコンバータにおける制御方式の比較

    河口祐樹, 平木英治, 田中俊彦, 定方秀樹, 藤田篤志, 大森英樹, 中岡睦雄

    電気学会全国大会講演論文集   2009 ( 4 )   2009

  • PFC機能を持つ高周波誘導加熱用三相AC-ACダイレクトコンバータの動作特性

    高原貴昭, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2009 ( 4 )   2009

  • 変換器容量低減を目的とした電気鉄道用パワーラインコンディショナの制御法-無効電流と変換器容量の検討-

    石倉規雄, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2009 ( 4 )   2009

  • 電動機エネルギー回収システムの充放電効率評価

    高橋圭介, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2009 ( 4 )   2009

  • SHマイコンを用いた連系インバータ用単相PLL

    田中敦士, 加藤善也, 平木英治, 田中俊彦, 野田修司, 谷野章

    電気学会全国大会講演論文集   2009 ( 4 )   2009

  • 2台のハーフブリッジを用いた電気鉄道用パワーラインコンディショナの一構成法

    石橋圭介, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2009 ( 4 )   2009

  • 双方向チョッパと単相PWM整流器を用いた大容量キャパシタシミュレータ-電源電流制御法の検討-

    田中敦士, 平木英治, 田中俊彦, 西村和則

    電気学会産業応用部門大会講演論文集   2009 ( 1 )   2009

  • 直流電圧バランサ付きハーフブリッジインバータを用いた単相3線式配電用電流バランサ

    菅原和也, 平木英治, 田中俊彦

    電気学会産業応用部門大会講演論文集   2009 ( 1 )   2009

  • 直流電圧バランサを有する単相三線式配電用電流バランサ

    馬場雄介, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   60th   2009

  • DCマイクログリッド用単相インバータの直流キャパシタ容量低減法

    関谷司, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   60th   2009

  • 結合インダクタを有する降圧型DC-DCコンバータの動作解析

    渡辺潤, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   60th   2009

  • 双方向チョッパと単相PWM整流器を用いたEDLCシミュレータ

    田中敦士, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   60th   2009

  • IHクッキングヒータ用チャージブースト型2出力フルブリッジインバータ

    銭谷紳, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   60th   2009

  • DC-DCコンバータのトランス動作磁束密度の推定-入力電圧急変モード-

    水島光, 田辺友章, 平木英治, 田中俊彦

    電気関係学会関西支部連合大会講演論文集(CD-ROM)   2009   2009

  • プッシュプルコンバータを用いたエネルギーストレージインターフェイス用双方向DC-DCコンバータ

    平生和雅, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   60th   2009

  • DC-DCコンバータのトランス動作磁束密度の推定-電源電圧一定モード試験-

    田辺友章, 水島光, 平木英治, 田中俊彦

    電気関係学会関西支部連合大会講演論文集(CD-ROM)   2009   2009

  • An EDLC Simulator Using a Buck-boost Chopper and PWM Rectifier

    MATSUMOTO Shuhei, HIRAKI Eiji, TANAKA Toshihiko, NISHIMURA Kazunori

    IEICE technical report   2008 ( 92 )   107 - 112   2008.7

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    This paper proposes an EDLC simulator consisting of a chemical capacitor and three-leg converter. One of three legs performs a buck-boost chopper. The others are used for a PWM rectifier. In the charging mode of the EDLC simulator most of the power stored in the chemical capacitor is injected to the utility through the PWM rectifier. In the discharging mode of the EDLC simulator the power is supplied to the chemical capacitor side from the utility through the PWM rectifier. Thus the chemical capacitor performs a large capacity EDLC. The basic principle of the proposed EDLC simulator is discussed in detail, then confirmed by digital computer simulation using PSIM software. A prototype experimental model is constructed and tested. Experimental results demonstrate the validity and excellent practicability of the proposed EDLC simulator.

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  • A Harmonic Currents Compensator for Wind Power Generation Systems with the Soft Starter Using A Hybrid Active Filter : Starting of the Harmonic Currents Compensator

    YAMADA Hiroaki, HIRAKI Eiji, TANAKA Toshihiko

    IEICE technical report   2008 ( 92 )   113 - 118   2008.7

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    This paper deals with a starting method for the previously proposed harmonic current compensator for wind power generation system with a soft stater using a hybrid active filter. The hybrid active filter consists of single-tuned LC and small-rated active filters. The single-tuned LC filter absorbs the harmonic current acting a phase-leading capacitor for the fundamental component. The fluctuation of the source current is caused by connecting the LC filter, and over compensation of the reactive power occurs before connecting the induction generator. This paper proposes a new control method of the hybrid active filter for avoiding the source current fluctuation and over compensation of the reactive power. The basic principle of the proposed control method is discussed in detail, and the confirmed by digital computer simulation using PSCAD/EMTDC software. Simulation results demonstrate that the current fluctuation and phase-leading current are suppressed by the proposed control method simultaneously.

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  • GPS端末を用いた位置情報検知システムの試作

    高井里絵, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2008 ( 3 )   2008

  • ハーフブリッジインバータを用いた単相三線式配電系統用電流バランサ-直流キャパシタ容量の検討-

    菅原和也, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   59th   2008

  • DCマイクログリッド用単相3線式インバータの一構成法

    末岡翔太, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   59th   2008

  • ハーフブリッジインバータを用いた電気鉄道用パワーラインコンディショナ

    石橋圭介, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   59th   2008

  • 直流電圧一定制御を用いた電気鉄道用パワーラインコンデイショナの一制御法

    石倉規雄, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2008 ( 4 )   2008

  • EDLCを用いた電動機の回生エネルギー回収システムの充放電効率評価

    高橋圭介, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   59th   2008

  • 直流電圧一定制御を用いた電気鉄道用パワーラインコンディショナの制御法-過渡応答特性の改善-

    石倉規雄, 平木英治, 田中俊彦

    電気学会産業応用部門大会講演論文集   2008 ( 1 )   2008

  • 家庭用誘導加熱(IH)調理器への応用を目的とした電流不連続モードPFC機能を有する2ステージ形高周波インバータの特性評価

    河口祐樹, 平木英治, 田中俊彦, 藤田篤志, 大森英樹, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2008 ( 1 )   2008

  • PFC機能を有する2ステージ形高周波インバータの家庭用IHクッキングヒータへの応用

    河口祐樹, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2008 ( 4 )   2008

  • ハウス屋根面へ配置した太陽光発電システムの長期試験結果

    西村拓也, 加藤善也, 平木英治, 田中俊彦, 谷野章, 古江彩, 門脇正行, 野田修司, 石津文人

    電気学会全国大会講演論文集   2008 ( 4 )   2008

  • The State-of-The Art Trends on Soft Switching Technology and Its Practical Applications

    平地克也, 岩本英雄, 夫馬弘雄, 加藤義人, 金春峰, 谷口勝則, 舩曳繁之, 松井景樹, 茂木進一, 入江寿一, 弦田幸憲, 中岡睦雄, 中村萬太郎, 二宮保, 平木英治, 渡辺修治, 石川裕記, 荻原弘之, 木船弘康, 米森秀登, 渡辺博巳, 石田宗秋, 笠展幸, 北條昌秀, 道平雅一, 岸本圭司, 小新博昭, 庄司浩幸, 安井健治, 宇敷修一, モイセエフ セルゲイ, 渡辺晴夫, 東聖, 岩倉哲史, 栗尾信広, 三浦友史, 山田健二, 木村友則, 篠原貞夫, 三島智和

    電気学会技術報告   ( 1119 )   2008

  • EDLCを併用した複合電力貯蔵デバイスを持つ独立型太陽光発電システムに関する検討

    中山浩昭, 平木英治, 田中俊彦, 幸田憲明, 高橋信雄, 野田修司

    電気学会全国大会講演論文集   2008 ( 4 )   2008

  • A Constant DC Voltage Control Based Method of the Active Power Quality Compensator for Electrified Railways

    田中俊彦, 石倉規雄, 福井博一, 平木英治

    電気学会論文誌 D   128 ( 2 )   2008

  • A New Control Method of a Current Balancer in Single-Phase Three-Wire Secondary Distribution Systems Using the Correlation and Cross-Correlation Coefficients

    Hirokazu Fukui, Eiji Hiraki, Toshihiko Tanaka

    IECON 2008: 34TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1-5, PROCEEDINGS   2006 ( 87 )   2194 - +   2008

  • A Novel Real-Time Detection Method of Active and Reactive Currents for Single-Phase Active Power Filters

    OMURA Yasushi, TANAKA Toshihiko, HIRAKI Eiji, ISHIKURA Norio, YAMAMOTO Masayoshi

    IEICE technical report   107 ( 149 )   39 - 44   2007.7

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    This paper proposes the simplest real-time detection method of the fundamental active and reactive currents in single-phase circuits. The proposed method uses only four multipliers and two LPFs for detecting the fundamental active and reactive currents with a PLL circuit. The basic principle of the proposed detection method is discussed in detail, and the proposed method is applied to a previously proposed single-phase shunt active filter for consumer electronic equipment. Digital computer simulation is used to confirm the validity of the proposed detection method. A reduce-scale experimental model is constructed and tested. Experimental results demonstrate the excellent practicability of the proposed detection method.

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  • Operation Charactersitics of an Asymmetrical Auxiliary Edge-Resonant Snubber-assisted ZCS-PWM DC-DC Converter

    MISHIMA Tomokazu, HIRAKI Eiji, TANAKA Toshihiko, NAKAOKA Mutsuo

    IEICE technical report   106 ( 494 )   7 - 12   2007.1

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    In recent years, research and development on a low voltage / high current output-type DC-DC converter have been attracting special interests in telecommunication and information power supplies as well as automotive electric power systems. For reducing switching losses and EMI levels in those electric power applications, several soft switching DC-DC converter topologies have been discussed with their control schemes. In this study, a novel high-frequcny transformer linked ZCS-PWM DC-DC converter that is constructed with an asymmetrical auxiliary resonant snubber-assisted half-bridge inverter and a current doubler rectifier is proposed. By investigating the operation and characteristics of this DC-DC converter, the ZCS scheme with the auxiliary snubber is verified to be effective, and design considerations of the resonant circuit parameters including the high- frequency transformer is described in this paper.

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  • PLL回路を用いた単相回路における簡易な有効・無効電流検出法

    松本脩平, 大村泰, 山本真義, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2007 ( 4 )   2007

  • 12th European Conference on Power Electronics and Applications

    Hiraki Eiji

    Journal of the Japan Institute of Power Electronics   33   242 - 242   2007

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    DOI: 10.5416/jipe2003.33.0_242

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  • ハイブリッドフィルタを用いた風力発電システム用高調波抑制装置-トレンド除去を用いたTHDの算出法-

    江南美穂, 山田洋明, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2007 ( 4 )   2007

  • BLT駆動用高周波ソフトスイッチングインバータと周波数追従制御

    吉川友, 平木英治, 田中俊彦, 中元正二, 大山超

    電気学会産業応用部門大会講演論文集   2007   2007

  • アモルファスシリコン型太陽電池を用いた太陽光発電システム

    加藤善也, 平木英治, 田中俊彦, 谷野章, 古江彩, 門脇正行, 野田修司, 石津文人

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   58th   2007

  • 家庭向け燃料電池発電システム用フライホイールシミュレータ

    西山祐史, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   58th   2007

  • 直流電圧一定制御を用いた電気鉄道用パワーラインコンディショナの制御法

    石倉規雄, 平木英治, 田中俊彦

    電気学会産業応用部門大会講演論文集   2007 ( 1 )   2007

  • ソフトスイッチング技術の動向:DC/DC変換

    弦田幸憲, 入江寿一, 中岡睦雄, 中村萬太郎, 二宮保, 安部征哉, 平木英治, 渡辺修治

    電気学会全国大会講演論文集   2007 ( 4 )   2007

  • 家庭での使用を目的としたEDLCシミュレータ

    矢野孝明, 平木英治, 田中俊彦

    電気学会産業応用部門大会講演論文集   2007 ( 1 )   2007

  • スーパーキャパシタを用いた複合電力貯蔵デバイスを持つ太陽光発電システムの検討

    中山浩昭, 平木英治, 田中俊彦, 幸田憲明, 高橋信雄, 野田修司

    電気学会全国大会講演論文集   2007 ( 4 )   2007

  • アクティブ部分共振スナバZCS-PWM DC-DCコンバータの検討

    三島智和, 福間輝, 平木英治

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   58th   2007

  • 電気鉄道用パワーラインコンディショナの一制御法

    福井博一, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2007 ( 4 )   2007

  • 燃料電池を用いた家庭用小型分散電源-改質器の応答による電力の余剰・不足電力の発生-

    松本脩平, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   58th   2007

  • 単相AC-ACダイレクトコンバータの回路パラメータ算定法

    田辺友章, 杉村央生, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   58th   2007

  • Discrete Pulse Density Modulation Controlled Series Load Resonant High Frequency Inverter for Induction Heated Fusing Roller with Cylindrical Working Coil Stator

    SUGIMURA Hisayuki, LEE Hyun-Woo, HIRAKI Eiji, TANAKA Toshihiko, NAKAOKA Mutsuo

    2006 ( 87 )   33 - 38   2006.6

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  • A Novel Soft-Switching PWM HB DC-DC Converter with DC Rail High and Low Side Active Edge Resonant Snubbers Assisted by High Frequency Transformer Parasitic Components

    AHMED Nabil A., FATHY Khairy, MORIMOTO Keiki, HIRAKI Eiji, LEE Hyun Woo, NAKAOKA Mutsuo

    IEICE technical report   105 ( 601 )   133 - 137   2006.2

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    This paper presents a new circuit topology of active edge resonant snubbers assisted half-bridge soft switching PWM inverter type dc-dc high power converter for DC bus feeding power plants. The proposed dc-dc power converter is composed of typical voltage source fed half-bridge high frequency PWM inverter with a high frequency transformer planar link in addition to do busline side power semiconductor switching devices for PWM control scheme and parallel capacitive lossless snubbers. The operating principle of the new dc-dc converter treated here is described by using switching mode equivalent circuits, together with its unique features. All the active power switches in the half-bridge arms and do buslines can achieve ZCS turn-on and ZVS turn-off commutation transitions and consequently the total turn-off switching losses of the power switches can be significantly reduced. As a result, a high switching frequency IGBTs can be actually selected in the range of 60 kHz under the principle of soft switching. The performance evaluations of the setup are illustrated experimentally. The effectiveness of this new converter topology is proved for low voltage and large current dc-dc power supplies such as DC bus feeding from a practical point of view.

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  • One Stage High Frequency AC-AC Converter for Induction Heating with Power Factor Correction Function

    TANIMATSU Hiroaki, HIRAKI Eiji, TANAKA Toshihiko, NAKAOKA Mutsuo, YASUI Kenji, HIROTA Izuo, IWAI Toshiaki, OMORI Hideki

    電気学会半導体電力変換研究会資料   2006 ( 36 )   47 - 52   2006.1

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  • An Analysis of Super Capacitor Interface Bi-Directional DC-DC Converter for Electric Vehicle

    ISHIGAMI Yoshinori, HIRAKA Eiji, TANAKA Toshihiko, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   2006 ( 36 )   29 - 34   2006.1

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  • Feasible Analysis of Two Stage Soft Switching DC-Three Phase Inverter

    SHIRAISHI Kazuhiro, HIRAKI Eiji, TANAKA Toshihiko, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   2006 ( 36 )   35 - 40   2006.1

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  • ハイブリッドフィルタを用いた風力発電システムにおけるソフトスタート時の高調波電流補償法-実機モデルに対する補償効果の検討-

    山田洋明, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   57th   2006

  • 電力の地産地消に関する研究

    矢野孝明, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   57th   2006

  • ロスレススイッチト・キャパシタスナバ方式ZCSハーフブリッジDC-DCコンバータの検討

    三島智和, FATHY Khairy, 平木英治, 中岡睦雄

    電気関係学会関西支部連合大会講演論文集(CD-ROM)   2006   2006

  • フライホイール発電機への応用を目的としたアクティブフィルタの一制御法

    楊井省一, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2006 ( 4 )   2006

  • ハイブリッドフィルタを用いたソフトスタート付き風力発電システムの高調波電流補償法-アクティブフィルタの直流キャパシタ容量の検討-

    山田洋明, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2006 ( 4 )   2006

  • フルブリッジ-プッシュプル構成の電気自動車用双方向DC-DCコンバータに関する検討

    山本剛司, 平木英治, 三島智和, 田中俊彦

    電気学会全国大会講演論文集   2006 ( 4 )   2006

  • アクティブ補助共振ロスレススナバ方式ZCS双方向DC-DCコンバータの検討

    三島智和, 平木英治, 田中俊彦

    電気学会全国大会講演論文集   2006 ( 4 )   2006

  • ハイブリッドフィルタを用いた風力発電システム用高調波抑制装置-弱小系統におけるリプルフィルタの検討-

    江南美穂, 山田洋明, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   57th   2006

  • アクティブ補助共振スナバを用いた誘導加熱用ZCS-PWM高周波インバータ

    三浦祐太, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   57th   2006

  • 単相三線式配電用電流バランサの実験による検討

    福井博一, 渡辺修治, 平木英治, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   57th   2006

  • フルブリッジ-プッシュプル構成の電気自動車用双方向DC-DCコンバータに関する検討

    山本剛司, 平木英治, 三島智和, 田中俊彦

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   57th   2006

  • A New Control Method of Single-Phase Active Filter Using the Correlation and Cross-Correlation Coefficients : Consideration for Harmonic Voltage and Momentary Voltage Drop

    UEDA Kengo, WATANABE Shuji, FUKUMA Shinji, HIRAKI Eiji, TANAKA Toshihiko

    電気学会半導体電力変換研究会資料   2005 ( 99 )   67 - 72   2005.11

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  • スーパーキャパシタエネルギー貯蔵システム対応双方向形DC-DCコンバータ

    三島 智和, 平木 英治

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   105 ( 269 )   19 - 24   2005.9

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  • Feasible Evaluations of PWM and PDM Dual Mode Controlled Soft Switching High-Frequency Inverter

    MIURA Yuta, HIRAKI Eiji, TANAKA Toshihiko, YASUI Kenji, IWAI Toshiaki, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   105 ( 197 )   49 - 54   2005.7

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    In this paper, a voltage-source type ZCS-SEPP high-frequency multi resonant inverter with a constant frequency PWM controlled active auxiliary quasi-resonant lossless sunbber, which is composed of switched capacitor and two lossless inductors in series with the main switches, is newly proposed for consumer IH cooking and processing applications. The operating principle of the proposed high frequency inverter circuit is presented and asymmetrical PWM control scheme for high-frequency effective power regulation is described here in. The effective operating characteristics of this high frequency inverter using IGBTs are illustrated and evaluated on the basis of experimental results. Finally, in order to extend soft switching operating range under low power setting condition, a pulse density modulation (PDM) based power regulation scheme is actually discussed for this consumer IH high frequency inverter.

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  • High Frequency AC-AC Direct Converter and Its Applications

    NAKAO Masahiro, HIRAKI Eiji, TANAKA Toshihiko, NAKAOKA Mutsuo, HIROTA Izuo, OMORI Hideki

    Technical report of IEICE. Energy engineering in electronics and communications   105 ( 197 )   55 - 60   2005.7

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    This paper presents the soft switching duty factor controlled AC-AC direct high frequency cycloconversion circuit for consumer Induction Heated cooker and steamer, which has unity power factor and sinewave line current shaping functions. The proposed utility frequency AC-high frequency AC cycloconverter as direct step-up frequency changer for converting commercial frequency AC (LFAC) into high frequency AC (HFAC) more than 20kHz can be composed of minimum circuit components for resonance components filter and diodes, which is possible to implement effective miniaturization, low cost, reliability, downsizing because of the non-electrolytic capacitor at zero voltage soft switching commutation scheme. This paper describes the operating principle and its unique features of LFAC-HFAC soft switching PWM cycloconverter circuit. Its utility AC side sinewave current quality and unity power factor correction characteristics are evaluated and discussed from an experiment point of view. Its practical effectiveness of this direct frequency changer is proven for consumer induction heated appliances in home and business usages.

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  • A Novel Type Active Resonant Snubber-Assisted Soft Switching PWM DC-DC Power Converter with High Frequency Transformer Link

    ISHIGAMI Yoshinori, HIRAKI Eiji, AHMED Nabil A, LEE Hyun Woo, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   104 ( 651 )   7 - 11   2005.2

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    In recent years, in several kW class, soft switching PWM DC-DC converter with a high frequency transformer link, which include a variety of active auxiliary resonant snubbers has been attracted special interest. The high efficiency, high power density and high performance due to the developments of high frequency soft switching commutation becomes realizable for practical applications. The miniaturization, lighter weight and high efficiency of the DC-DC power converters can be advanced. In this paper, the proposed high frequency isolated phase shift PWM DC-DC power converter with auxiliary resonant DC link snubbers, which is suitable for arc welding equipment, is presented and discussed. The operating principle of new DC-DC power converter with optimum gate pulse pattern is described, along with its unique features. The operating characteristics of DC-DC converter treated here is illustrated and discussed as compared with previously-proposed soft switching DC-DC power converter with a high frequency link. Its practical effectiveness is proved on the basis of the simulation results.

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  • Current-Fed E Class High Frequency Soft Switching PDM Inverter for Driving Dielectric Barrier Discharge Fluorescent Lamp

    MATSUDA Mikiya, HIRAKI Eiji, AHMED Nabil A., LEE Hyun Woo, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   104 ( 651 )   21 - 25   2005.2

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    In recent years, the environmental recycling movement of the mercury-less comes out from the practical viewpoint of influence to the human body and environmental preservation. This paper presents a cost effective PDM (Pulse Density Modulation) controlled current source type high frequency edge resonant high frequency inverter using a single power semiconductor switch for driving and dimming the dielectric barrier discharge based mercury-less rare gas fluorescent lamp. The current source-fed class E edge resonant soft switching inverter treated here are evaluated on the basis of the simulation results and experimental ones and discussed for operating characteristics of the rare gas (Xe) barrier discharge fluorescent lamp from an application point of view. Furthermore, the experimental performances are comparatively evaluated from the viewpoints of performance evaluations in these resonant inverters, are discussed as compared with the royer type high frequency inverter and current source-fed class E edge resonant soft switching inverter.

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  • Utility Frequency AC to High Frequency AC Direct Converter with Soft Switching Commutation Approach

    NAKAO Masahiro, SUGIMURA Hisayuki, HIRAKI Eiji, AHMED Nabil A., LEE Hyun Woo, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   104 ( 651 )   27 - 32   2005.2

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    This paper presents the soft switching duty factor controlled AC-AC direct high frequency cycloconversion circuit for consumer Induction Heated cooker and steamer, which has unity power factor and sinewave line current shaping functions. The proposed utility frequency AC-high frequency AC cycloconverter as direct step-up frequency changer for converting commercial frequency AC (LFAC) into high frequency AC (HFAC) more than 20kHz can be composed of minimum circuit components for resonance, filter and diodes, which is possible to implement effective miniaturization, low cost, reliability, high efficiency, downsizing because of the non-electrolytic capacitor at zero voltage soft switching commutation scheme. This paper describes the operating principle and its unique features of LFAC-HFAC soft switching PWM cycloconverter circuit. Its utility AC side sinewave current quality and unity power factor correction characteristics are evaluated and discussed from an experiment point of view. Its practical effectiveness of this direct frequency changer is proven for consumer induction heated appliances in home and business usages.

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  • Phase shifted PWM DC-DC Converter with active auxiliary Resonant snubber

    NISHIDA Tomomasa, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   104 ( 650 )   31 - 35   2005.2

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    The full bridge inverter circuit can operates under soft switching by the phase shifted PWM control method. However, this conventional soft switching full bridge DC-DC converter cannot achieve the soft switching in all power range. Then, this paper presents a new circuit topology of high frequency link DC-DC converter with active auxiliary snubber. This proposed active auxiliary resonant snubber make wider soft switching range compared with simplest soft switching Full Bridge DC-DC converter. In this paper, We clarify the operation of the active auxiliary snubber and the comparative experimental result.

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  • A Novel Single-Phase Sinewave Inverter Controlled by Time-Sharing Sinewave Absolute Modulated Soft Switching PWM Boost Chopper

    OGURA Koki, SHIRAISHI Kazuhiro, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   104 ( 650 )   7 - 13   2005.2

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    This paper presents a novel prototype circuit topology of a high efficiency single-phase sinewave inverter, which is composed of time-sharing sinewave absolute modulated boost chopper in the first power processing stage and time-sharing sinewave modulated full-bridge inverter in the second power processing stage operated by time-sharing dual mode control scheme. Its unique operating principle of two power processing stage with time-sharing dual mode sinewave modulation scheme is described in addition to a design example. Finally, this paper proposes a soft switching boost chopper with a single passive auxiliary edge-resonant snubber. The new conceptual operating principle of this novel sinewave inverter related to new energy generation system is presented and discussed by using the experimental results.

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  • Advanced High Power DC-DC Converter using A Novel Voltage Source Full-Bridge Soft-Switching PWM Inverter with High Frequency Transformer Link for Utility AC400Vrms Input

    MORIMOTO Keiki, DOI Toshimitsu, MANABE Haruhiko, HIRAKI Eiji, LEE Hyun Woo, NAKAOKA Mutsuo, AHMED Tarek

    電気学会半導体電力変換研究会資料   2005 ( 9 )   1 - 7   2005.1

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  • アクティブ補助共振スナバ方式ソフトスイッチングPWMインバータの太陽光発電システムへの応用

    白石和洋, 小倉弘毅, 中村万太郎, 平木英治

    電気学会全国大会講演論文集   2005 ( 4 )   2005

  • 補助共振スイッチ付高周波トランスリンクソフトスイッチングPWM DC-DCコンバータの特性評価

    衛藤哲弥, 石上宜範, 平木英治, 中岡睦雄, 土井敏光, 真鍋陽彦, 森本慶樹

    電気学会全国大会講演論文集   2005 ( 4 )   2005

  • IHクッキングヒータ用PWM/PDM複合制御型ソフトスイッチング高周波インバータ

    三浦祐太, 谷松弘章, 平木英治

    電気学会全国大会講演論文集   2005 ( 4 )   2005

  • 簡易制御型アクティブ共振DCリンクスナバを持つ三相電圧形ソフトスイッチングインバータ

    藤井勇馬, 白石和洋, 中村万太郎, 平木英治

    電気学会全国大会講演論文集   2005 ( 4 )   2005

  • 希ガス蛍光ランプ調光用高周波インバータの性能評価

    藤田堅太郎, 松田樹也, 平木英治

    電気学会全国大会講演論文集   2005 ( 4 )   2005

  • Newly-Proposed hybrid Resonant Commutation Bridge Led Link Snubber Assisted Three-Phase ZVZCS-PWM Soft-Switching Inverter

    平木 英治

    Journal of Power Electronics Vol.5,No.1   29 - 35   2005

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  • An Active Auxiliary Quasi-Resonant Commutation BlockSnubber-Assisted Three Phase Voltage Source Soft Switching PFC Rectifier using IGBTs

    平木 英治

    JOURNAL OF POWER ELECTRONICS Vol.5,No.1   29 - 35   2005

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  • Power Loss Estimation Analysis Based on Experimental Power Switching Device Data for Three-Phase ARCP Assisted Soft Switching Inverter

    HIRAKI Eiji, HIROTA Yoshihiko, NAKAOKA Mutsuo, HORIUCHI Toshikazu, SUGAWARA Yoshitaka

    IEICE TRAS. COMMUN   87 ( 5 )   1366 - 1372   2004.5

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    This paper deals with a simple and practical power loss analysis simulator, which can actually estimate the total power losses of three phase voltage-fed Auxiliary resonant commutation pole snubber assisted soft switching inverter as well as hard-switching inverter. In order to estimate the switching power losses and conduction power losses of switching semiconductor power devices (IGBTs), which are incorporated into the inverters, the proposed practical simulator is making use of feasible switching power loss data tables and conduction power loss data tables, which are accumulated from the measured voltage and current operating wave forms of power semiconductor switching devices. The practical effectiveness of feasible simulation technique and power loss evaluations for power electronic conversion circuits and systems are confirmed by the simulation and experimental results basis under the conditions of soft switching and hard switching sinusoidal PWM schemes.

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  • Auxiliary Resonant Leg Link Snubber-Assisted Single-Phase Soft-Switching Inverter

    FUJII Yuma, IMAMURA Kosuke, NAKAMURA Mantaro, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   103 ( 653 )   5 - 8   2004.2

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    This paper presents the voltage source inverter with auxiliary resonant leg link snubber. The proposed ARLL snubber is a kind of soft-switching principle for voltage-fed inverter. In this paper, designing method of control timing and circuit parameter is described on the ARLL snubber. Through several experiments, circuit operation and efficiency were confirmed and the validity of this circuit is verified by experimental results.

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  • Bridge Type Resonant AC Link Snubber-Assisted Three-Phase Voltage Source Sinewave Soft-Switching PWM Inverter and Its Performance Evaluations

    IYOMORI Hisashi, NAGAI Shin-ichiro, YOSHIDA Masanobu, HIRAKI Eiji, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   2004 ( 47 )   7 - 11   2004.1

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  • AC Load Voltage Regulator with Static VAR Compensator for Three-Phase Self-Excited Induction Generator

    TAREK Ahmed, NORO Osamu, SOSHIN Koji, SRAWOUTH Chandhaket, HIRAKI Eiji, NAKAOKA Mutsuo

    2004 ( 1 )   19 - 24   2004.1

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  • 高周波パルス変調ソフトスイッチングインバータの現状と技術動向

    平木英治, 長井真一郎

    電気学会全国大会講演論文集   2004 ( 4 )   2004

  • 新ゲートパルスパターンによるアクティブ補助共振スナバ方式ソフトスイッチングPWMインバータとその応用

    白石和洋, 小倉弘穀, 中村万太郎, 藤井勇馬, 平木英治, 中岡睦雄, LEE H W

    電気学会産業応用部門大会講演論文集   2004 ( 1 )   2004

  • Terminal Voltage Regulation Implementation of Three-Phase Self-Excited Induction Generator Using Static VAR Compensator

    AHMED Tarek, HIRAKI Eiji, NAKAOKA Mutsuo

    21   285 - 288   2003.8

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  • Soft-Switching PWM Three-Phase Rectifier for Rotating Type New Energy Distributed Power Supply

    FUJII Yuma, YAMAMOTO Masayoshi, SHIRAISHI Kazuhiro, HIRAKI Eiji, NAKAOKA Mutsuo

    21   181 - 182   2003.8

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  • Soft Switching PWM High Frequency Inverter with Minimum Circuit Components using IGBTs for Small Scale Induction Heater and Comparative Evaluations

    NISHIDA Tomoasa, GAMAGE Laknath, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   103 ( 38 )   61 - 66   2003.5

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    This paper presents a simple, compact and low cost circuit topology of edge-resonant soft switching PWM high frequency inverter using complementary two IGBTs, which can operate under wider power regulation and soft switching operation ranges as compared with a edge-resonant single-ended ZVS-PFM high frequency inverter using a single IGBT and active voltage-clamped edge-resonant ZVS-PWM high frequency inverter. In principle, this new high frequency inverter circuit topology can efficiently work on the basis of a constant frequency PWM power regulation scheme under zero voltage and current hybrid soft switching commutation modes. It is noted that the zero current soft switching (ZCS) transition can achieve for the main active power switch. On the other hand, the zero voltage soft switching (ZVS) transition can also achieve for the auxiliary active power switch. The steady state working principle of this inverter operating under a condition of a constant frequency and its some salient features are described and evaluated on the basis of the computer simulation analysis and feasible experimental results, together with its comparative operating performances of this inverter and the other two types of inverters. The practical effectiveness of this newly developed inverter using the IGBTs is proved for electromagnetic induction heated appliances.

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  • High Frequency Soft Commutation Inverter and IH Super Heated Steamer

    FUJITA Kentarou, AHMED Tarek, GAMAGE Laknath, HIRAKI Eiji, NAKAOKA Mutsuo, KIFUNE Hiroyasu, HATANAKA Yosihiro

    Technical report of IEICE. Energy engineering in electronics and communications   103 ( 38 )   67 - 72   2003.5

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    In this paper, the lossless capacitor snubber full bridge-type high frequency load resonant inverter with phase shifted PWM control scheme and AC side active auxiliary resonant AC link snubber and lossless capacitor snubber-assisted full bridge high frequency series load resonant inverter proposed here are comparatively evaluated and discussed including a simulation and experiment. It is proved that the AC side active resonant snubber-assisted soft switching phase shift PWM high frequency series load resonant inverter using IGBT power modules on the basis of simulation and experiment can considerably expand soft switching of these inverters are comparatively range based on auxiliary active resonant AC link snubber operating under low power control setting. In this paper, the operating characteristics is evaluated and analyzed for electromagnetic induction eddy current based super heated steamer using Dual Packs Heater.

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  • Soft Switching High Frequency PWM Boost Chopper Type DC-DC Converter with High Boost Voltage Conversion Ratio, Vol.J86-B,No.3, pp.599-603

    INABA Claudio Y., KONISHI Yoshihiro, HIRAKI Eiji, NAKAOKA Mutsuo

    IEICE transactions on communications   86 ( 3 )   1202 - 1202   2003.3

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    the basis of simulation and experimental results.In this paper, an advanced soft switching boost chopper type DC-DC converter using coupled inductors is proposed in order to implement a high step-up voltage ratio. An active voltage clamp cell connected in the proposed circuit reduces switching losses and suppresses the peak voltage of active power semiconductor devices utilized. Its circuit operation is verified and evaluated on

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  • Wind Turbine Driven Three-Phase Self-Excited Induction Generator with Static VAR Compensator and Its Performance Evaluations

    AHMED Tarek, SOSHIN Koji, NAGAI Shinichiro, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   102 ( 644 )   35 - 40   2003.2

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    This paper presents the nodal admittance approach steady-state analysis and operating performance evaluations of the three-phase Self-Excited Induction Generator (SEIG) driven by Variable-Speed Prime Movers (VSPMs) ; the wind turbine. The main features of the present algorithm of the steady-state operating analysis of the three-phase SEIG are that the VSPM characteristics included in the approximate electro-mechanical equivalent circuit of the three-phase SEIG and its operating performances in unregulated voltage control loop are then evaluated and discussed on line under the conditions of the speed changes of the VSPM and the electrical passive load power variations with the simple theoretical analysis and computation processing procedures. A three-phase SEIG prototype setup with a VSPM is also concretely implemented for small-scale clean renewable energy utilizations. The experimental operating performance results give good agreements with the simulation ones. In addition, a PI controlled feedback closed-loop voltage regulation scheme of the three-phase SEIG driven by the VSPM on the basis of the Static VAR Compensator (SVC) composed of the Thyristor Phase Controlled Reactor (TCR) in parallel with the Thyristor Switched Capacitor (TSC) and the Fixed Excitation Capacitor bank (FC) is designed and discussed herein for the promising stand-alone power conditioner. The simulation and experimental results prove the effectiveness and validity of the proposed SVC controlled by the PI controller in terms of fast response and high performances of the three-phase SEIG driven by the VSPM.

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  • 結合インダクタ形高昇圧率チョッパ入力段を持つ三相電圧形インバータの特性評価

    平木英治

    電気学会中国支部講演論文集, 2003-10   130   2003

  • Performance Evaluations of A Single Inductor Type Resonant AC Link Snubber-Assisted Three-Phase Voltage Source Soft-Switching Inverter

    吉田正伸, 平木英治, 中岡睦雄

    電気学会論文誌 D   123 ( 11 )   2003

  • Actual efficiency and electromagnetic noises evaluations of a single inductor type resonant AC link snubber-assisted three-phase soft-switching inverter Reviewed

    M Yoshida, E Hiraki, M Nakaoka

    INTELEC'03: POWERING THE BROADBAND NETWORK, PROCEEDINGS   721 - 726   2003

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  • Comparative EMI evaluations of three-phase ZVS-PWM and ZVZCS-PWM inverters Reviewed

    M Yoshida, E Hiraki, M Nakaoka

    PEDS 2003 : FIFTH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS, VOLS 1 AND 2, PROCEEDINGS   108 - 113   2003

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  • Electromagnetic noises and efficiency evaluations of three-phase ZVS-PWM inverter with new resonant AC link snubbers Reviewed

    M Yoshida, Y Fujii, E Hiraki, M Nakaoka

    IECON&apos;03: THE 29TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1 - 3, PROCEEDINGS   2911 - 2916   2003

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  • A Consideration on Auxiliary Resonant AC Link Snubber with Switched Capacitor and Application to Soft Switching Inverter

    IYOMORI Hisashi, YOSHIDA Masanobu, SATO Shinji, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   102 ( 43 )   89 - 94   2002.5

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    This paper presents a novel prototype of the auxiliary resonant AC link snubber circuit for the single phase voltage source type sinwave soft switching PWM inverter. Its operating principle is described for current source load model, and the performance evaluations of single phase voltage source type sinewave soft switching PWM inverter with an active auxiliary resonant AC link snubber is illustrated and discussed as compared with those of sinewave hard switching PWM inverter. The power loss analysis is this inverter using IGBTs is evaluated and discussed on the basis of the measused v-i characteristics and switching losses.

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  • Small Scale Utility-Connected Solar Photovoltaic Power Conditioner using Soft Switching High-Frequency Sinewave Modulated Inverter Link for Residential Applications

    Ogura Koki, Chandhaket Srawouth, Hirota Yoshihiko, Hiraki Eiji, Nakaoka Mutsuo

    52 ( 2 )   95 - 100   2002.3

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  • Soft switching of Boost Type PWM Chopper Circuit for Small Scale and Performance Evaluations

    ANDO Masayuki, YOSHITSUGU Junji, HIRAKI Eiji, NAGAI Shinichiro, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   101 ( 651 )   9 - 15   2002.2

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    In recent years, the high-frequency PWM boost chopper type DC-DC converter operating under a condition of zero voltage soft switching have attracted special interest for PWM inverter. This paper presents a new topology of boost chopper type soft switching PWM DC-DC converter. Its operating principle is described on the basis of simulation and experimental results. The three phase-soft switching inverter with a single resonant DC link which incorporate the boost soft switching PWM chopper in its input side and its operating performance are discussed and evaluate for inverter moduration depth is presented.

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  • Experimental Evaluations of the Soft Switching SPWM Inverter with Chemical Capacitorless Resonant Snubbers

    NAKAMURA Mantarou, YAMAZAKI Takayuki, SATO Shinji, HIRAKI Eiji, NAKAOKA Mutsuo

    IEICE technical report. Component parts and materials   101 ( 548 )   9 - 13   2002.1

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    In this paper, in order to minimize switching power losses of power semiconductor devices and electromagnetic noises (EMI, RFI) on large-capacity AC power supply using the voltage source type soft switching sinewave PWM inverter and PFC converter, a circuit topology of the auxiliary resonant commutation snubber treated here, is proposed for zero voltage soft switching transition under a condition of high frequency PWM strategy. The operation principle and characteristics of this active auxiliary snubber circuit is described for voltage source type inverter, together with a practical design procedure of this resonant snubbe. Furthermore, the computer simulation analysis of single phase full bridge soft switching PWM inverter using the auxiliary resonant snubbers treated here, the simulation and experimental results are evaluated as compared with single phase sinewave PWM hard switching inverter.

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  • A simple resonant DC link snubber-assisted bidirectional three phase PWM converter for battery energy storage system

    HIRAKI E.

    KIEE International Transactions on Electrical Machinery and Energy Conversion Systems   2 ( 3 )   133 - 139   2002

  • Practical Power Loss Simulation Analysis for Soft Switching and Hard Switching PWM Inverters

    HIRAKI E.

    IEEE Proc. of Power Conversion Conference, Osaka, Japan, 2002   2   553 - 558   2002

  • ソフトスイッチング方式正弦波電力変換器の変調法

    平木英治, 中岡睦雄

    電気学会全国大会講演論文集   2002 ( 4 )   2002

  • Consideration of Three Phase ZCZVS Inverter using Newly Developed ARCP Snubber.

    広田慶彦, 吉田正伸, 平木英治, 佐藤伸二, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-02 ( 77-96 )   2002

  • バスラインゼロ電圧ホールド可能な新方式補助共振DCリンクスナバ回路と三相電圧形インバータへの適用

    広田慶彦, 中村万太郎, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2002 ( 1 )   2002

  • 直流リアクトルとアクティブ補助共振DCリンクスナバをもつソフトスイッチング正弦波PWMインバータの検討

    黒瀬洋一, 広田慶彦, 中村万太郎, 佐藤伸二, 平木英治, 中岡睦雄

    電子情報通信学会大会講演論文集   2002   2002

  • 多並列ブリッジPWM電流増幅器を用いたMRI傾斜磁場の最適制御法

    渡辺修治, 平木英治, 高野博司, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2002 ( 3 )   2002

  • 2石補助共振DCリンクスナバを用いた三相電圧形ソフトスイッチングPWMインバータの直流電圧利用率改善

    長井真一郎, 佐藤伸二, 山本真義, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2002 ( 1 )   2002

  • ソフトスイッチングインバータ用一括スイッチ形アクティブ補助共振ACリンクスナバ回路の一検討

    伊与森尚, 吉田正伸, 佐藤伸二, 平木英治, 中岡睦雄

    電子情報通信学会大会講演論文集   2002   2002

  • Minimum PWM Pulse Width Control of Soft Switching Power Conversion System.

    平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-02 ( 30-43 )   2002

  • 電磁誘導流体加熱用位相シフトZVS-PWM制御高周波負荷共振インバータ

    黒瀬洋一, 平木英治, 奥野敦, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2002 ( 1 )   2002

  • ロスレススナバキャパシタ単独転流を利用した共振ACリンクスナバインバータ

    吉田正伸, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2002 ( 1 )   2002

  • ブリッジ形共振ACリンクスナバ回路の一検討

    伊与森尚, 吉田正伸, 長井真一郎, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2002 ( 1 )   2002

  • 多重入力MRI傾斜磁場電源のディジタル最適制御

    渡辺修治, 平木英治, 高野博司, 中岡睦雄

    電気学会全国大会講演論文集   2002 ( 4 )   2002

  • A Consideration on An Auxiliary Active Resonant Commutation Snubber for Large-Capacity Power Conversion Circuits and Soft Switching PWM Inverter using Resonant Snubbers

    NAKAMURA Mantarou, YAMAZAKI Takayuki, RUKONUZZAMAN Md., HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   101 ( 293 )   9 - 14   2001.9

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    In this paper, for the purpose of reducing switching power losses of both power semiconductor devices and electromagnetic noises(EMI, RFI)on large-capacity power source system using voltage source type sinewave PWM inverter and PFC converter as well as bi-directional converter, a circuit topology of the auxiliary resonant commutation snubber is proposed and discussed for soft switching transition of the voltage source source pulse modulated inverter. The operation principle and characteristics of this active auxiliary snubber circuit is described, together with a practical design procedure of this unique resonant snubber. Furthermore, the computer simulation analysis of single phase full bridgs soft switching PWM inverter using the resonant bridge leg snubbers treated here, the simulation results of this inverter are evaluated as compared with hard switching inverter.

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  • Comparative Studies on Auxiliary Active Resonant DC Link Snubber Circuit Topologies for Soft Switching Sinewave Pulse Modulated Inverters

    HIROTA Yoshihiko, YOSHIDA Masanobu, RUKONUZZAMAN Md., HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   101 ( 293 )   15 - 21   2001.9

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    This paper presents three proto types of auxiliary active resonant DC link snubber circuit topology for soft switching PWM inverter and their comparative considerations. In this paper, the operation principles and characteristics of their auxiliary active resonant DC link snubber circuits are described for the basic circuit features. The single phase PWM inverters with their auxiliary active resonant DC link snubber circuits treated here are evaluated with aid of computer simulation. Furthermore, by introducing power losses data of IGBTs and diodes to their simulation programs, their efficiencies are discussed and evaluated for each soft switching inverter using IGBTs.

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  • Feasible Evaluations of 3-Phase Voltage-Fed Soft-Switching Inverter with Two Active Resonant Snubbers

    Yamamoto M., Hiraki E., Nakaoka M.

    Proceedings of the IEICE General Conference   2001 ( 2 )   423 - 424   2001.3

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  • Practical Simulator Development for Power Loss Performance Analysis of Voltage-fed Soft Switching Inverter using IGBTs.

    平木英治, 山本真義, 中村万太郎, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-01 ( 1-13 )   2001

  • Practical design approach of a single inductor type active resonant AC link snubber for voltage-fed soft switching inverter and feasible performance evaluations Reviewed

    M Yoshida, E Hiraki, M Nakaoka

    IECON&apos;01: 27TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1-3   850 - 855   2001

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  • Three phase soft switching inverter with pulse current transformer - Assisted resonant snubbers Reviewed

    CY Inaba, T Yamazaki, M Yoshida, E Hiraki, Y Konishi, M Nakaoka

    ISIE 2001: IEEE INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS PROCEEDINGS, VOLS I-III   1106 - 1111   2001

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  • Auxiliary active quasi-resonant commutation block snubber-assisted voltage source three phase soft switching PFC rectifier Reviewed

    E Hiraki, M Yoshida, M Nakaoka, T Horiuchi, Y Sugawara

    PESC 2001: 32ND ANNUAL POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-4, CONFERENCE PROCEEDINGS   1647 - 1652   2001

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  • 永久磁石方式ACサーボモータ駆動用ソフトスイッチングインバータの検討

    吉次淳二, 井上堅治, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2001 ( 3 )   2001

  • Circuit Topologies of Active Auxiliary Resonant DC Link Snubbers and Voltage Sinewave PWM Inverters.

    広田慶彦, 奥野敦, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-01 ( 113-121 )   2001

  • Inverter for Far Infrared Rays Radiant Heating Appliance using Spiral Planar Type Induction Heater.

    定方秀樹, 田中秀明, MOISSEEV S, 平木英治, 中岡睦雄, 荻原弘之

    電気学会半導体電力変換研究会資料   SPC-01 ( 113-121 )   2001

  • Soft Switching Inverter using Active Resonant AC Link Snubberand Its Performance Evaluations.

    吉田正伸, 小倉弘毅, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-01 ( 26-37 )   2001

  • 電流利用率を改善した共振DCリンク三相電流形PWMコンバータ

    石橋正基, 小西義弘, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2001 ( 2 )   2001

  • Performance Evaluations of 3-Level 3-Phase Voltage-Fed Soft-Switching Inverter with Active Resonant Snubbers Circuit.

    山本真義, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-01 ( 113-121 )   2001

  • 一括インダクタ形ACリンクスナバインバータと実証的性能評価

    吉田正伸, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2001 ( 3 )   2001

  • 汎用DSPを用いた磁場電流制御システムの特性評価

    渡辺修治, 西田克美, 高野博司, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   2001 ( 2 )   2001

  • Active Resonant DC Link Snubber Assisted Current-Source Soft-Switching Parallel Load Resonant Inverter with PDM Control Scheme

    FENG Yuelu, KONISHI Yosihiro, KOUDRIAVTSEV Oleg, HIRAKI Eiji, NAKAOKA Mustuo

    Technical report of IEICE. Energy engineering in electronics and communications   100 ( 304 )   1 - 7   2000.9

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    In this paper, a current-source type parallel inductor compensated load resonant high-frequency soft switchinginverter using IGBTs which incorporate a single switched capacitor resonant DC link snubber into DC busline side is presented and discussed, along with its operating principle and its pulse density modulated output power regulation characteristics in thc case of driving the newly-produced silent discharge type ozone generating tube.

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  • Three Phase Soft Switching Inverter using Auxiliary Resonant Commutated Snubbers with Coupled Inductor-based Pulse Current Feedback Loop

    INABA Claudio Yudi, NAKAMURA Mantaro, YOSHIDA Masanobu, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   100 ( 304 )   17 - 24   2000.9

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    In this paper, an auxiliay active resonant commutation snubber(Advanced ARCS)with a coupled inductor-based pulse current feedback loop is proposed as compared with the conventional ARCS. A new three-phase voltage source soft switching inverter incorporating the advanced ARCS circuits in its three phase bridge legs has some advantages such as reduced current rating and peak stresses of auxiliary active power switches and sensorless control scheme without any boost current management required for soft switching. Its operation principle and control scheme are described and a design method of parameters on this advanced ARCS circuit is also discussed. Moreover, this soft switching inverter system with DSP-based digital control scheme is evaluated on the basis of computer simulation and its practical effectiveness is proved by simulation results.

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  • Simulation of Series-Parallel Resonant DC-DC Converter System with DSP-Based Digital Control Scheme

    MOBIN Ulhaqsyed, HIRAKI Eiji, TAKANO Hiroshi, NAKAOKA Mutsuo

    IEICE transactions on fundamentals of electronics, communications and computer sciences   83 ( 7 )   1458 - 1466   2000.7

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    This paper describes an efficient simulation approach of a DSP controlled series-parallel resonant high frequency DC-DC power converter system. Proposed power conversion circuit simulation approach is based on a circuit equation, modeled by substituting time-varying switched resistor circuit in place of all the controllable and uncontrollable power semiconductor switching blocks of power converter circuits. An algebraic algorithm transforms the matrices of the circuit equation into the matrices of the state vector equation. Solution of state equation is by 3rd order Runge kutta numerical integration method. Simulation results are illustrated and discussed together with experimental results.

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  • Feasible Performance Evaluations of A Three Phase Voltage Vector Modulation Resonant Snubber Assisted Soft-Switching Inverter for Small Scale PM Motor Drive Systems

    YOSHITSUGU Junji, INOUE Kenji, ANDO Masayuki, HIRAKI Eiji, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   100 ( 215 )   41 - 47   2000.7

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    This paper presents a simple circuit topology of the single auxiliary active resonant DC link snubber(ARDCL) which is used for the instantaneous space voltage vector modulation ARDCL assisted three phase voltage source soft-switching inverter suitable for small scale PM motor drive applications. The specific related pulse processing drive circuit interface of the auxiliary resonant DC link snubber circuit and its soft-switching operation are discussed from an experimental point of view. In addition, the conductive magnetic noise of quasi-resonant snubber-assisted three phase zero voltage soft-switching inverter in the case of PM motor drive in its open loop scheme is actually measured and evaluated in experimental setup as compared with the general purpose three phase hard switching inverter.

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  • Evaluations of Three Phase Voltage-Source Soft-Switching Based Instantaneous Var Compensator

    HATTORI H., YAMAMOTO H., HIRAKI E., HIRACHI K., NAKAOKA M.

    電気学会半導体電力変換研究会資料   2000 ( 1 )   31 - 36   2000.1

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  • ソフトスイッチング三相電圧形インバータ用電力損失分析シミュレータの開発

    平木英治

    電気関係学会関西支部連合大会講演論文集、G5パワーエレクトロニクス, 2000年11月   2000

  • Feasible Evaluations of 3-Level 3-Phase Voltage-Fed Soft-Switching Inverter with Two Active Resonant Snubbers.

    山本真義, CHANDHAKEF S, ABDULLAH AL M, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   SPC-00 ( 37-53 )   2000

  • Advanced Development of Soft Switching Inverter for AC Motor Electrical Drive Systems

    吉次淳二, 井上堅治, 安藤正之, MOISSEV Serugei, 平木英治, 中岡睦雄

    山口大学工学部研究報告(Web)   51 ( 1 )   2000

  • ロスレスキャパシタスナバと共振DCリンクスナバの併用制御ソフトスイッチングインバータ

    小田義行, 黒川学, 平木英治, 小西義弘, 中岡睦雄

    電気学会全国大会講演論文集   2000 ( 4 )   2000

  • MRI傾斜磁場電流制御用ZCS-PWMインバータの検討

    渡辺修治, 平木英治, 高野博司, 中岡睦雄

    電気学会全国大会講演論文集   2000 ( 4 )   2000

  • Auxiliary Quasi-Resonant Commutation Block nubber assisted voltage source three phase soft switching PFC rectifier Reviewed

    E Hiraki, M Yoshida, M Nakaoka

    IECON 2000: 26TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1-4   1019 - 1024   2000

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  • Active resonant leg-link snubber-assisted three phase soft commutation PFC converter and its practical evaluations Reviewed

    M Yoshida, M Yamamoto, E Hiraki, S Chandhaket, M Nakaoka

    IECON 2000: 26TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1-4   2660 - 2665   2000

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  • A Consideration of Digitally-Controlled Bidirectional Voltage-Source Type Soft-Switching Converter for Utility-Interactive Systems

    YAMAMOTO Hisaaki, HIRAKI Eiji, NAKAOKA Mutsuo, HIRACHI Katsuya

    電気学会半導体電力変換研究会資料   1999 ( 93 )   61 - 66   1999.10

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  • Comparative Studies of Soft Switching Inverter Circuit Topologies using A Single Resonant Snubber

    YOSHIDA Masanobu, YOSHITSUGU J., INOUE K., HIRAKI E., NAKAOKA M.

    電気学会半導体電力変換研究会資料   1999 ( 93 )   49 - 54   1999.10

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  • Simulation Analysis of Voltage-fed Three Phase Soft Switching PWM-PFC Rectifier with Auxiliary Resonant Commutation Block-Snubbers

    HIRAKI Eiji, HONDA Takao, NAKAOKA Mutsuo

    Technical report of IEICE. Energy engineering in electronics and communications   99 ( 176 )   9 - 16   1999.7

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    This paper presents a new active resonant snubber assisted (Auxiliary Resonant Commutation Block-Link Type) voltage-fed three phase soft switching PWM-PFC rectifier, which can operate under a principle of Zero Voltage Switching (ZVS) condition. The steady-state performances of this digitally-controlled soft switching PWM-PFC rectifier are illustrated and evaluated on the basis of computer-aided analysis.

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  • Three Phase Current Source PWM Converter with Switched-Capacitor Type Quasi-Resonant Snubber

    ISHINBASHI Masaki, KONISHI Yoshihiro, HIRAKI Eiji, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   1999 ( 51 )   103 - 108   1999.6

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  • Quasi-Resonant DC linked NPC 3-Phase Voltage Source Soft-Switching Inverter and Its New Control Scheme

    Yamamoto M., Matsumoto Y., Hiraki E., Nakaoka M.

    Technical report of IEICE. Energy engineering in electronics and communications   98 ( 607 )   1 - 8   1999.2

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    This paper presents a pecrformance analysis of digitally-controlled three-level three-phase voltage source sort switching inverter system incorporating two Quasi-Resonant DC link snubber which can operate under a condition of Zero Voltage Sort Switching (ZVS). This voltage-fed sort-switching inverter suitable for high power applications is evaluated as compared with two-level sort switching pulse modulated inverter. The steady-state system performances of this inverter are illustrated and evaluated on the basis of simulation results.

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  • Voltage-Fed Soft-Switching Inverter with Current Regeneration Loop Quasi-Resonant Snubbers

    HATTORI Hiroshi, HIRAKI Eiji, HIRACHI Katsuya, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   1999 ( 28 )   65 - 70   1999.1

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  • Three-Level Three-Phase Voltage-Fed Zero Voltage Soft-Switching PWM Inverter with Auxiliary Resonant DC Link Snubber and Novel Pulse Pattern

    MATSUMOTO Yoshihide, YAMAMOTO Masayoshi, HATTORI Hiroshi, NISHIDA Katsumi, HIRAKI Eiji, NAKAOKA Mutsuo

    電気学会半導体電力変換研究会資料   1999 ( 28 )   71 - 76   1999.1

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  • Feasible Performance Evaluations of Active Resonant Snubber-Assisted Three Phase Soft Switching Inverter

    HIRAKI E.

    IEEE PESC, June 1999   1999

  • 新方式3レベル三相電圧形ソフトスイッチングインバータシステム

    安藤正之, 山本真義, 平木英治, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   50th   1999

  • 3レベル3相電圧形PWMソフトスイッチングインバータと性能評価

    山本真義, 松本由秀, 平木英治, 西田克美, 中岡睦雄

    電気学会全国大会講演論文集   1999 ( 4 )   1999

  • 30th IEEE Power Electronics Specialists Conference (PESC'99)

    Journal of the Japan Institute of Power Electronics   25 ( 1 )   99 - 99   1999

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    DOI: 10.14913/jipe1995.25.99

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  • 補助共振スナバ方式ソフトスイッチングインバータの損失評価

    服部弘, 吉田正伸, 山元久明, 平木英治, 中岡睦雄

    電気学会全国大会講演論文集   1999 ( 4 )   1999

  • 三相電圧形PWM-PFCコンバータのソフトスイッチング化について

    平木英治, 本田隆生, 中岡睦雄

    電気学会産業応用部門大会講演論文集   1999 ( 2 )   1999

  • PDM&PWM制御方式高周波ソフトスイッチングインバータとその応用

    WANG S P, 小西義弘, 平木英治, 中岡睦雄

    電気学会全国大会講演論文集   1999 ( 4 )   1999

  • 3レベル三相電圧形ソフトスイッチングインバータシステムの実証的評価

    山本真義, 平木英治, 中岡睦雄

    電気学会産業応用部門大会講演論文集   1999 ( 2 )   1999

  • シングルエンデッド電流共振形高周波インバータの回路トポロジーと特性評価

    菱川真吾, 斎藤行平, 平木英治, OLEG K, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   50th   1999

  • 系統連系双方向三相電圧形ソフトスイッチングコンバータを用いた2次電池電力貯蔵システム

    山元久明, 小田義行, RUKONUZZAMAN M, 平木英治, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   50th   1999

  • 新ベクトルパターンを用いた補助共振ACリンク三相電圧形インバータ

    吉田正伸, 小倉弘毅, 平木英治, 中岡睦雄, 西村和則

    電気・情報関連学会中国支部連合大会講演論文集   50th   1999

  • Auxiliary Resonant Commutated Snubber Three Phase Voltage-fed PFC Rectifier and Its Performance Evaluations

    YAMAMOTO M., HIRAKI E., NAKAOKA M.

    Technical report of IEICE. Energy engineering in electronics and communications   98 ( 173 )   21 - 28   1998.7

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    This paper presents a performance analysis of Auxiliary Resonant Commutation Snubber-linked three phase voltage source soft awitching PFC rectifier using a digital control scheme which can operate under a condition of Zero Voltage Switching (ZVS) suitable for high power applications as compared with resonant three phase hard switching PFC rectifier. The system performances of this soft-switching PFC rectifier are illusrated and evaluated on the basis of experimental results.

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  • The Application of Voltage-Fed Three Phase PWM Inverter by New Voltage Vector Modulated Pulse Digital Control Pattern New Pulse Pattern

    KUROKAWA Manabu, HIRAKI Eiji, NAKAOKA Mutsuo

    Memoirs of the Faculty of Engineering,Yamaguchi University   48 ( 2 )   197 - 202   1998.3

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    We have developed the new pulse pattern by new resonant DC link for voltage-fed three phase inverter. By using this pattern, we can decrease the number of resonant DC link operation, so, conduction loss and switching loss will decrease. Moreover, Electro Magnetic Interference will decreased, too.

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    Other Link: http://www.lib.yamaguchi-u.ac.jp/yunoca/handle/KJ00000157128

  • Feasible Performance Evaluations of Auxiliary Quasi-Resonant Commutated Mode Three-Phase Voltage Source Inverter

    MATSUMOTO Y., SHIMIZU T., KAMBE A., HIRAKI E., NAKAOKA M.

    Technical report of IEICE. Energy engineering in electronics and communications   97 ( 542 )   9 - 15   1998.2

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    This Paper presents a feasible performance evaluations of Auxiliary Resonant Commutated three-phase voltage-fed ZVS-PWM inverter using the latest IGBT modules, which can operate under a principle of zero voltage switching transition PWM. This soft-switched inverter are more suitable and acceptable for high-power applications such as utility-interactive inverter in new energy power system, active power filter and static var compensator. The 3kVA trially-produced inverter system with a digital signal processor-based control processing is demonstrated and its experimental results are illustrated and evaluated as compared with a conventional hard-swithching PWM voltage-fed inverter.

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  • 補助共振転流ポール双方向三相電圧形ZVS-PWMコンバータの実証的評価検討

    清水利憲, 神戸存日, 平木英治, 中岡睦雄

    電気学会全国大会講演論文集   1998 ( 4 )   1998

  • 部分補助共振ACリンクをもつソフトスイッチング単相アクティブ整流PFCコンバータ

    平木英治, 中岡睦雄

    電気学会全国大会講演論文集   1998 ( 4 )   1998

  • 新部分共振形ソフトスイッチング三相電圧形PFCコンバータの提案

    神戸存日, 平木英治, 中岡睦雄

    電気学会全国大会講演論文集   1998 ( 4 )   1998

  • One system of soft switching inverter for FACTs.

    服部弘, 金田充, 吉田正伸, 平木英治, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   49th   1998

  • Feasible Performance Evaluations of Digitally-Controlled Three Phase Voltage Source Soft-Switching Inverter with Auxiliary Resonant Commutation Snubber

    Hiraki Eiji, Nakaoka Mutsuo, Furuya Shinichi

    Journal of the Japan Institute of Power Electronics   24 ( 1 )   42 - 48   1998

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    This paper presents performance evaluations of Auxiliary Resonant Commutation Snubber-linked (ARCS) three phase voltage source soft switching inverter using IGBTs which can operate under a condition of Zero Voltage Switching (ZVS). This inverter system with the two input and two output optimal type I digital servo controller is more suitable for high power applications compared with resonant DC linked soft switching inverter. The system performances of this inverter are illustrated and evaluated from an experimental point of view.

    DOI: 10.14913/jipe1995.24.42

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  • Feasible Evaluations of DSP Controlled Auxiliary Resonant Commutation Snubber Three Phase Voltage Source Soft-Switching Inverter.

    平木英治, 服部弘, 中岡睦雄, 杉本重幸, 香田勲

    電子情報通信学会大会講演論文集   1998   1998

  • New partial resonance switching block and zero voltage soft switching three-phase voltage type PFC converter using it.

    本田隆生, 安永健児, 平木英治, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   49th   1998

  • Three Phase Voltage-Fed PWM Inverter with Two Degreedom Type Resonant DC Link and New Zero Vector Pattern-based Characteristic Improvement

    MII T., SHIMIZU T., KAMBE A., KUROKAWA M., HIRAKI E., NAKAOKA M., YONEMORI H.

    電気学会半導体電力変換研究会資料   1997 ( 14 )   69 - 74   1997.1

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  • Three phase voltage type converter using a new part resonance soft switching block.

    神戸存日, 山本真義, 服部弘, 本田隆生, 馬場直也, 平木英治, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   48th   1997

  • Characteristics evaluation of an instant spatial vector sinusoidal modulation system support resonance three-phase voltage inverter.

    松本由秀, 服部弘, 平木英治, 小西義弘, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   48th   1997

  • Utility-Interactive Bidirectional Three Phase Voltage-Fed ZVS-PWM Inverter System.

    清水利憲, 黒川学, 平木英治, 中岡睦雄

    電気学会電力・エネルギー部門大会論文集   8th ( 2 )   1997

  • A Novel Resonant DC Link Multi-Functional Converter for Battery Energy Storage System

    HIRAKI Eiji

    Proceedings of European Conference on Power Electronics and Applications, Aug., 1997   4   362 - 367   1997

  • Power Factor Correction ZVS-PWM Rectifiers with Resonant AC Link.

    平木英治, 神戸存日, 中岡睦雄

    電気学会電力・エネルギー部門大会論文集   8th ( 2 )   1997

  • Power Factor Correction ZVS-PWM Rectifiers with Resonant AC Link.

    神戸存日, 平木英治, 西田保幸, 中岡睦雄, 平地克也

    電気学会半導体電力変換研究会資料   SPC-97 ( 39-53 )   1997

  • Proposal of new part resonant type soft switching three-phase voltage-type PFC converter.

    神戸存日, 服部弘, 山本正義, 平地克也, 平木英治, 中岡睦雄, 堀内利一, 菅原良孝

    電気関係学会関西支部連合大会講演論文集   1997   1997

  • Support part resonance commutation arm link three-phase voltage inverter.

    松本由秀, 平木英治, 小西義弘, 中岡睦雄, 堀内利一, 菅原良孝

    電気関係学会関西支部連合大会講演論文集   1997   1997

  • Operation Characteristics of Auxiliary Resonant Commutated Arm-Link Three Phase Voltage-Fed Inverter with Space Vector Modulation.

    松本由秀, 服部弘, 平木英治, 小西義弘, 中岡睦雄

    電気関係学会四国支部連合大会講演論文集   1997   1997

  • Utility-Interactive Bidirectional Resonant DC Link Three Phase ZVS-PWM Converter and its Control Scheme

    SHIMIZU T., KUROKAWA M., HIRAKI E., NAKAOKA M.

    電気学会半導体電力変換研究会資料   1996 ( 113 )   11 - 20   1996.10

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  • Space Voltage Vector Controlled Three-Phase ZVS-PWM Active AC-DC Converter using IGBTs

    Kambe A., Yonemori H., Nishida Y., Hiraki E., Nakaoka M.

    Proceedings of the Society Conference of IEICE   1996 ( 2 )   405 - 405   1996.9

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  • Part resonant type zero voltage soft switching PWM high frequency inverter with flat frequency variable electric power control function.

    井崎潔, 山下秀和, 大森英樹, おう盛し, 平木英治, 中岡睦雄

    電気学会半導体電力変換研究会資料   1996 ( 29 )   9 - 17   1996.1

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  • Source voltage estimating instant space voltage vector controling three-phase ZVS-PWM rectifying converter.

    神戸存日, 米森秀登, 平木英治, 中岡睦雄, LIN D C

    電気関係学会関西支部連合大会講演論文集   1996   1996

  • Characteristics evaluation of resonance AC linked single phase voltage-type ZVS-PWM inverter.

    平木英治, 神戸存日, 黒川学, 井関利英, 中岡睦雄, 加藤義人

    電気・情報関連学会中国支部連合大会講演論文集   47th   1996

  • Three-phase PWM converter system by source voltage sensorless control.

    神戸存日, GAMAGE L, 松本由秀, 黒川学, 平木英治, 中岡睦雄

    電気・情報関連学会中国支部連合大会講演論文集   47th   1996

  • University laboratory visit (79). Yamaguchi Univ. engineering department, electricity and electronics faculty/graduate school engineering research section, electric energy engineering course power electronics system laboratory.

    中岡睦雄, 平木英治

    工業加熱   33 ( 2 )   1996

  • New transformer-assisted resonant DC link topology and its application for three-phase voltage-FED ZVS-PWM sinewave inverter using instantaneous space voltage vector modulation

    YONEMORI Hideto, YASUTSUNE Hidenobu, HIRAKI Eiji, IZUMI Teruyuki, NAKAOKA Mutsuo

    Memoirs of the Faculty of Engineering,Yamaguchi University   45 ( 2 )   p321 - 329   1995.3

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    The newly-proposed Resonant DC Link (RDCL) topology operating under the high-frequency trans-former-assisted zero-voltage soft switching commutation principle is presented in this paper. This basic circuit operating principle and the optimum design procedure for Transformer-Assisted Quasi-Resonant DC Link (TQRDCL) which excludes its load current sensing-based predictive feedback control loop and the DC voltage-clamped PWM function are considered as compared with the conventional RDCL circuit topologies. The performance of three-phase ZVS-PWM inverter system is discussed and evaluated in terms of the comparative study between TQRDCL three-phase soft-switching PWM type and conven-tional three-phase hard-switching PWM inverter systems on the basis of the simulating and experimental results.

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    Other Link: http://www.lib.yamaguchi-u.ac.jp/yunoca/handle/KJ00000157014

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  • 誘導加熱装置

    梅谷 和弘, 川原 翔太, 三宅 大樹, 石原 將貴, 平木 英治, 市川 周一, 宮入 由紀夫, 桝田 昌明, 石原 拓也

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    Applicant:日本碍子株式会社

    Application no:特願2022-177661  Date applied:2022.11.4

    Announcement no:特開2024-067516  Date announced:2024.5.17

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    平木 英治, 梅谷 和弘, 霜村 光太

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    Applicant:国立大学法人 岡山大学

    Application no:特願2021-159624  Date applied:2021.9.29

    Announcement no:特開2023-049712  Date announced:2023.4.10

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    清本 訓央, 樋口 智之, 平木 雅人, 三田 英治, 末廣 保

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    Applicant:パナソニックIPマネジメント株式会社

    Application no:特願2021-140598  Date applied:2021.8.31

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  • 変圧器および電力変換装置

    水谷 大斗, ▲高▼原 貴昭, 森 修, 平木 英治, 梅谷 和弘, 白川 知秀, 村田 涼

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    Application no:JP2019048314  Date applied:2019.12.10

    Patent/Registration no:特許第7118294号  Date registered:2022.8.4 

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    水谷 大斗, ▲高▼原 貴昭, 森 修, 平木 英治, 梅谷 和弘, 白川 知秀, 村田 涼

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    Application no:JP2019040655  Date applied:2019.10.16

    Publication no:WO2021-074996  Date published:2021422

    Patent/Registration no:特許第6793877号  Date registered:2020.11.12 

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  • 電力変換装置用磁性部品

    水谷 大斗, ▲高▼原 貴昭, 森 修, 平木 英治, 梅谷 和弘, 白川 知秀, 村田 涼

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    Application no:特願2020-512054  Date applied:2019.10.16

    Patent/Registration no:特許第6793877号  Date registered:2020.11.12 

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  • 電力変換装置用磁性部品

    水谷 大斗, ▲高▼原 貴昭, 森 修, 平木 英治, 梅谷 和弘, 白川 知秀, 村田 涼

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    Application no:JP2019040655  Date applied:2019.10.16

    Publication no:WO2021-074996  Date published:2021422

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  • 誘導加熱コイルユニット及び誘導加熱調理器

    廣川 貴之, 東 和章, 野村 博義, 平木 英治, 梅谷 和弘, 三島 知浩

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    Application no:特願2018-194552  Date applied:2018.10.15

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  • 変圧器

    モイセエフ セルゲイ, 森 昌吾, 石原 義昭, 平木 英治

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    Application no:特願2016-152740  Date applied:2016.8.3

    Announcement no:特開2018-022765  Date announced:2018.2.8

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  • 微小金属材料の加熱方法及び金属の検出方法と検出装置

    山田 幸治, 三宅 泰弘, 野田 勇二郎, 廣幡 大樹, 長尾 達也, 田中 俊彦, 平木 英治, 山本 直樹

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    Application no:JP2014055383  Date applied:2014.3.4

    Publication no:WO2014-136745  Date published:2014912

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  • 金属の検出装置

    山田 幸治, 三宅 泰弘, 野田 勇二郎, 廣幡 大樹, 長尾 達也, 田中 俊彦, 平木 英治, 山本 直樹

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    Application no:特願2015-504312  Date applied:2014.3.4

    Patent/Registration no:特許第6263165号  Date registered:2017.12.22 

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  • 無効電力補償装置およびその制御方法

    田中 俊彦, 平木 英治, 寺西 雄二

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    Applicant:国立大学法人山口大学

    Application no:特願2011-255082  Date applied:2011.11.22

    Announcement no:特開2013-110884  Date announced:2013.6.6

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  • 太陽電池によるリチウムイオン電池充電装置

    田中 俊彦, 田中 幹也, 平木 英治, 室木 正勝, 福江 正亮

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    Applicant:ユーディーエンジニアリング株式会社

    Application no:特願2007-176962  Date applied:2007.7.5

    Announcement no:特開2009-017686  Date announced:2009.1.22

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  • 複層塗膜形成方法

    桑野 英治, 神門 孝司, 平木 忠義

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    Application no:特願2006-205279  Date applied:2006.7.27

    Announcement no:特開2007-061812  Date announced:2007.3.15

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  • 複層塗膜形成方法

    桑野 英治, 神門 孝司, 平木 忠義

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    Application no:特願2006-205279  Date applied:2006.7.27

    Announcement no:特開2007-061812  Date announced:2007.3.15

    Patent/Registration no:特許第5153096号  Date registered:2012.12.14 

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  • 複層塗膜形成方法

    桑野 英治, 笠原 尚子, 西田 貴光, 松原 茂樹, 平木 忠義

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    Applicant:関西ペイント株式会社

    Application no:特願2006-006428  Date applied:2006.1.13

    Announcement no:特開2006-231322  Date announced:2006.9.7

    Patent/Registration no:特許第5162097号  Date registered:2012.12.21 

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  • 電着塗装方法及び複層塗膜形成方法

    桑野 英治, 平木 忠義, 阿久井 潤

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    Applicant:関西ペイント株式会社

    Application no:特願2001-390787  Date applied:2001.12.25

    Announcement no:特開2003-193297  Date announced:2003.7.9

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  • 電着塗装方法及び複層塗膜形成方法

    桑野 英治, 平木 忠義, 阿久井 潤

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    Applicant:関西ペイント株式会社

    Application no:特願2001-390787  Date applied:2001.12.25

    Announcement no:特開2003-193297  Date announced:2003.7.9

    Patent/Registration no:特許第3756809号  Date registered:2006.1.6 

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  • モータ構造

    近藤 二郎, 平木 英治, 河村 賢

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    Applicant:マツダ株式会社

    Application no:特願平7-017644  Date applied:1995.2.6

    Announcement no:特開平8-214522  Date announced:1996.8.20

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  • インバータ装置

    杉原 毅, 平木 英治, 近藤 二郎, 田村 精二

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    Applicant:マツダ株式会社

    Application no:特願平6-062212  Date applied:1994.3.31

    Announcement no:特開平7-274537  Date announced:1995.10.20

    Patent/Registration no:特許第3373035号  Date registered:2002.11.22 

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  • エンジンの過給装置

    近藤 二郎, 杉原 毅, 中根 久典, 清水 勉, 山本 研一, 川戸 康史, 須原 俊男, 平木 英治

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    Applicant:マツダ株式会社

    Application no:特願平6-057056  Date applied:1994.3.28

    Announcement no:特開平7-259576  Date announced:1995.10.9

    Patent/Registration no:特許第3337811号  Date registered:2002.8.9 

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  • 電気車の制御装置

    近藤 二郎, 杉原 毅, 平木 英治, 田村 精二

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    Applicant:マツダ株式会社

    Application no:特願平6-066774  Date applied:1994.3.9

    Announcement no:特開平7-250403  Date announced:1995.9.26

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  • 水素吸蔵用合金貯蔵タンク

    藤原 邦彦, 平木 英治, 吉本 和幸, 對尾 良則

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    Applicant:マツダ株式会社

    Application no:特願平5-011599  Date applied:1993.1.27

    Announcement no:特開平6-221500  Date announced:1994.8.9

    Patent/Registration no:特許第3392168号  Date registered:2003.1.24 

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  • 電圧型PWMインバータ

    平木 英治, 近藤 二郎

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    Applicant:マツダ株式会社

    Application no:特願平4-278748  Date applied:1992.10.16

    Announcement no:特開平6-133559  Date announced:1994.5.13

    Patent/Registration no:特許第3424245号  Date registered:2003.5.2 

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  • 誘導電動機

    近藤 二郎, 平木 英治, 吉本 和幸, 清水 勉

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    Applicant:マツダ株式会社

    Application no:特願平4-285284  Date applied:1992.9.29

    Announcement no:特開平6-113493  Date announced:1994.4.22

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  • 水素吸蔵用合金部材およびその製造方法

    吉本 和幸, 小笠原 徹, 平木 英治, 谷岡 真一

     More details

    Applicant:マツダ株式会社

    Application no:特願平3-280981  Date applied:1991.10.28

    Announcement no:特開平5-005137  Date announced:1993.1.14

    J-GLOBAL

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  • 水素電池用電極およびその製造方法

    小笠原 徹, 平木 英治

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    Applicant:マツダ株式会社

    Application no:特願平3-267851  Date applied:1991.10.16

    Announcement no:特開平5-109406  Date announced:1993.4.30

    J-GLOBAL

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  • 水素貯蔵タンク

    上岡 敏嗣, 平木 英治, 吉本 和幸, 清水 勉, 小笠原 徹

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    Applicant:マツダ株式会社

    Application no:特願平3-259061  Date applied:1991.10.7

    Announcement no:特開平5-099074  Date announced:1993.4.20

    J-GLOBAL

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Research Projects

  • Development of highly stable wireless power transfer system for implantable medical devices

    Grant number:21K04015  2021.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    梅谷 和弘, 平木 英治

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

    2021年度の研究では,申請書において当初より提案しているワイヤレス給電システムにおいて,製造誤差や磁気干渉に伴う共振周波数のばらつきや変化によらず安定的な送電能力を実現するための具体的な制御方法の要件を理論的に解析し,その妥当性を実験的に実証した。理論解析では,ワイヤレス給電システムの回路動作において,電力を担う基本波成分の電圧・電流波形の振る舞いに着目し,基本波成分のみの動作を表現する等価回路モデルを構築した。この等価回路モデルの動作を分析した結果,送電器の交流電源に対して同期するように送電器のATACを位相差0°で,かつ,受電器のATACをすべて位相差90°で動作させることで共振周波数のばらつきや変化によらない送電能力が実現できることを発見した。
    さらに,このように理論的に導出したATACの動作条件の妥当性を確認するため,提案するワイヤレス給電システムの実験回路を構築し,このATACの駆動条件における送電電力の特性を評価した。この実験では,製造誤差や磁気干渉に伴う共振周波数のばらつきや変化を想定し,受電器の共振周波数を敢えて最適値からずらしたときの送電電力の変化や,複数の受電器間の磁気結合を変化させたときの送電電力の変化を評価した。その結果,理論的に予想したとおり,受電器の共振周波数の変化や,受電器間の磁気結合の変化によらず一定の送電電力を得ることが確認でき,提案システムが期待通り有望であることを確認できた。

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  • SiCデバイスのスイッチング動作時に発生する誤動作メカニズムの解明

    Grant number:19K04351  2019.04 - 2023.03

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    平木 英治, 梅谷 和弘

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    Grant amount:\4550000 ( Direct expense: \3500000 、 Indirect expense:\1050000 )

    申請者はこれまでSiCと双璧をなす次世代パワーデバイスであるGaNパワーデバイスの連鎖的誤動作解明に取り組んできた。ディジタル的なスイッチング(ON-OFF) 動作をするGaNパワーデバイスに発生する誤動作が,実はアナログ回路におけるバルクハウゼンの発振原理に基づいており,「GaNパワーデバイスが持つ端子間寄生容量と回路配線によるドレイン,ソース,ゲートの各寄生インダクタンスによって構成する三つのLC共振要素の共振周波数の大小関係を適切に制御することで誤動作抑制が可能である」という理論を,世界に先駆けて明らかにした。これは「配線インダクタンスを単に小さくするのではなく,GaNパワーデバイス自身が持つ寄生容量にあわせて配線インダクタンスを適切に調整することで連鎖的誤動作抑制が可能」なことを意味している。この理論はまだ普及が進んでいないGaNパワーデバイスに留まらず,SiCパワーデバイスにも適用できると考えている。そこで,2019年度は,SiCパワーデバイスのターンオフ直後の単発誤動作に着目してその出現条件を実験的に明らかにした。
    2020年度は,前年度に明らかになったSiCパワーデバイスのターンオフ直後の単発誤転弧の出現条件から,(1)誤転弧発生メカニズムの解明,(2)その抑制理論の構築を行った。さらに,(2)の検証を行うべく,抑制理論に一部基づいて設計した三相インバータ回路を試作した。

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  • Circuit Wiring Design Method for Preventing the Oscillatory False Triggering of GaN Power Devices

    Grant number:16K06223  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Hiraki Eiji

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    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

    Ultra-high-speed, low on-resistance GaN-FETs are attracting attention as next-generation power semiconductor devices, and are becoming essential for the development of small-sized, high-efficiency power supplies. However, since high speed operation is possible, there is a concern about increase in noise. Since the GaN-FET has a low on-off threshold voltage, it is prone to malfunction. Since this malfunction may destroy the GaN-FET itself, it is a major obstacle to the industrial application of the GaN-FET.
    In this research, we focused on the chain-like malfunction peculiar to GaN-FET, clarified the relationship between the malfunction mechanism and the circuit parasitic inductance, and developed the circuit wiring design method that can make full use of the high-speed switching characteristics possessed by GaN.

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  • Contact-less AC Power Supply System for EV/PHV in Parking Tower

    Grant number:25420256  2013.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Hiraki Eiji, TANAKA Toshihiko, UMETANI Kazuhiro

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    In tandem with the penetration of PHV as well as EV, contact-less power supply system in parking towers have become important subjects. In parking towers, EV and PHV are charged on the traveling pallets, supply power is to be transmitted from the building to travelling pallets. In this paper, high-frequency link AC-AC converter for contact-less power supply system in parking tower is newly proposed and its basic operation and performance have been demonstrated from computer aided simulation and experiment.

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  • 産業応用を目的とした高出力密度高周波誘導加熱用電源の開発

    2009.04 - 2010.03

    JST  地域イノベーション創出総合支援事業 

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    Authorship:Principal investigator 

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  • An FC Generation System for Home Appliances Considering a Developing Goal of a Reformer in USA with Oversupply and Shortage Power Compensation

    Grant number:21560300  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    TANAKA Toshihiko, HIRAKI Eiji

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

    This research deals with a Fuel Cell(FC) generation system with a reformer for home appliances. The proposed FC generation system is with an EDLC. The EDLC stores the power generated from FC when the load in a house is changed from heavy to light conditions. The EDLC supplies power to the load when the load is changed from light to heavy conditions. So the proposed FC generation system can compensate the oversupply and shortage power from the FC. A current balancer operation is added to the power conditioner. This balancer operation improves the efficiency of the pole mounted distribution transformer. A variable capacity capacitor simulator with an inner resistor is also proposed. A proto type laboratory model is constructed and tested. Detail evaluations of the constructed mode and economical review are an important issue for further study.

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  • スーパーキャパシタを効果的に利用したEV用高効率回生エネルギ回収システム

    2006.04 - 2007.03

    JST  地域イノベーション創出総合支援事業 

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    Authorship:Principal investigator 

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  • A Home Use Fuel Cell Generation System with an Energy Storage Device to Suppress the Surplus and Deficit Power Caused by a Reformer

    Grant number:18560278  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    TANAKA Toshihiko, HIRAKI Eiji

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    Grant amount:\2610000 ( Direct expense: \2400000 、 Indirect expense:\210000 )

    The summary of this research results is as follows:
    1. Development of the FC simulator with a reformer The FC simulator with a reformer has been constructed using a controllable dc power supply, and tested to demonstrate the validity of the constructed FC simulator.
    2. Development of the grid-connectable inverter for the FC The grid-connectable inverter for the FC has been constructed with a DSP-based control system, where the inverter acts as a power line conditioner. Thus the balanced and sinusoidal source currents are obtained generating the dc power by the FC.
    3. Confirmation of the surplus power in the home uses of the FC generation system We have demonstrated that the surplus and deficit power exits when the consumed power in a home is suddenly changed. Suppressing the surplus power is needed because the injection of the power generated by the FC generation system to power systems is not permitted by Japanese low. Thus the moment of inertia of the fly-wheel generator is decided.
    4. Construction of the fly-wheel generator The fly-wheel simulator with the dc motor drive system has been constructed on PSIM software, where the do motor drive system acts as a fly-wheel. The moment of inertia is controllable. Thus the constructed fly-wheel simulator is useful for various home uses.
    5. Construction of a FC generation system for home uses A FC generation system with a fly-wheel generator simulator has been constructed considering a typical Japanese home. In home uses of the FC generation system, the load conditions are suddenly changed. So the surplus and deficit power exists as described the above. We have demonstrated that the surplus and deficit power generated by the FC generation system are perfectly suppressed by the fly-wheel generator by digital computer simulation.
    6. Development of a EDLC simulator According to the development plan of the DOE, the response time of a reformer will be less than 2s by 2010. This means that an EDLC can be used to suppress the surplus and deficit power. Thus we have developed an EDLC simulator for home uses.

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  • Performance development of the three-phase soft switching power conversion system for electric vehicle

    Grant number:15560244  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    HIRAKI Eiji

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    Grant amount:\3400000 ( Direct expense: \3400000 )

    The three-phase PWM inverters and three phase PWM rectifier have been designed so as to operate on the basis of the high frequency switching sinewave pulse modulation scheme more than 16 kHz or more. The performance enhancement relating waveform quality and quick response and downsizing realization of three- phase PWM power converter circuits and systems mentioned above are strongly required for high- frequency switching sinewave pulse modulation and control implementation. In general, the switching power losses of the power semiconductor devices and power modules, and switching voltage and current surge related electromagnetic noise generated by a high dv/dt and di/dt tend to increase in those of three-phase hard switching sinewave PWM inverters and rectifiers.
    Thus, soft switching sinewave PWM power conversion circuit and system techniques operating under soft commutation conditions of zero voltage switching transition and zero current switching transition are more indispensable for the concrete realization of the high efficiency in power conversion processing and reduced switching noises even in high frequency switching sinewave PWM strategy because of reduced dv/dt and di/dt electrical stresses and switching power losses in power semiconductor devices..
    This paper presents the simulation and experimental evaluations and discussions of the three-phase voltage source type soft switching PWM inverter using the three auxiliary resonant commutation snubbers, which can be turned on and turned off with zero current and zero voltage hybrid switching as the perfect soft switching. The operating principle of this ZCS & ZVS type auxiliary resonant commutation snubber circuit is described and evaluated herein. In addition to this, its optimum circuit parameters are determined from a simulation point of view. Finally, the operating performances of this resonant snubber assisted three-phase voltage source type soft switching sinewave PWM inverter are evaluated and discussed on the basis of the 3kW experimental setup.

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