Papers - HIRAKI Eiji
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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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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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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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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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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