Faculty Profiles - HIRAKI Eiji

Papers - HIRAKI Eiji

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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

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

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

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

Language：Japanese Publisher：The Japan Institute of Power Electronics

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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