Faculty Profiles - HIRAKI Eiji

Papers - HIRAKI Eiji

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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

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

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

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

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

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

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

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

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

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

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

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

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

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

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

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

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

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

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

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

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

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

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

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

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

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

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

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

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

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

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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