Faculty Profiles - HIRAKI Eiji

MISC - HIRAKI Eiji

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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

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

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

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.

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

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

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.

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

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

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

Language：English Publisher：The Institute of Electronics, Information and Communication Engineers

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

Language：English Publisher：DENSHI JOHO TSUSHIN GAKKAI KIKAI SHINKO KAIKAN

In recent years, it has been more important power conversion technology for implementing the downsizing and low electromagnetic noise, high performance and high efficiency in order to achieve high frequency pulse modulation-based switching of the power semiconductor devices in power conversion circuits and systems with a great advance of the power semiconductor switching devices. In general, high frequency switching-based pulse width modulation of the power semiconductor devices in the inverter and converter produces some significant problems such as increase of switching power losses and EMI/RFI noises, leak current generation related to a high dv/dt and electrical insulation breakdown of reactor and transformer due to a high di/dt. In order to overcome these problems, soft switching power conversion circuit technologies are able to give effective solutions from a practical point of view. In this paper, a novel prototype of the resonant AC link snubber-assisted inverter that the auxiliary resonant commutation circuits are simply connected in parallel with the three-phase AC load of the three-phase voltage source inverter is presented to achieve the zero voltage soft switching PWM or pulse modulated zero voltage soft-switching inverter or rectifier, and operation mode and the sinewave modulation method of an active resonant AC link snubber circuit is described, and the performance evaluations such as output line-to-line voltage waveforms, actual power conversion efficiency, electromagnetic conductive and radiative noises of this resonant snubber-assisted voltage source soft-switching inverter circuit are basically evaluated and discussed as compared with those of three-phase hard-switching inverter from an experimental point of view.

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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

Language：English Publisher：IEEE

This paper presents the three-phase voltage source soft-switching pulse width modulation (PWM) based inverter using the quasi-resonant commutation snubber circuits in order to improve the power conversion efficiency, realize the high control performances and reduce the electromagnetic noises as compared with three-phase voltage source conventional hard-switching PWM inverter. At first, the resonant AC link snubber-assisted soft-switching inverter is presented as the zero voltage soft-switching (ZVS) PWM inverter and the operation principle of the resonant AC link snubber circuit is explained. Secondly, the common mode and differential mode electromagnetic conductive noises of the resonant AC link snubber-assisted ZVS-PWM inverter is evaluated as compared with the hard-switching PWM inverter, and it is shown clearly that the reduction of differential mode noise is ineffective by using the resonant AC link snubber-assisted ZVS-PWM inverter as compared with hard-switching PWM inverter from the measured results. Thirdly, in order to overcome this problem, the hybrid resonant commutation bridge leg link snubber circuit that the zero voltage and zero current soft-switching (ZVZCS) of all the switches of inverter bridge arms are achieved is proposed, and operation principle of this hybrid resonant commutation bridge leg link snubber circuit is presented. And at last, the electromagnetic noise level of the ZVZCS-PWM inverter and hard-switching PWM inverter are evaluated, it is explained that both common mode and differential mode noises can reduce by using the hybrid resonant commutation bridge leg link snubber as compared with hard-switching PWM inverter, and it is described that ZVCS-PWM inverter is suitable to improve both conductive common mode and differential mode electromagnetic noise levels.

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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'03: THE 29TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, VOLS 1 - 3, PROCEEDINGS 2911 - 2916 2003

Language：English Publisher：IEEE

This paper presents a novel prototype of three-phase voltage source type zero voltage soft-switching (ZVS) inverter using the main and auxiliary IGBT power module packages in order to reduce their switching power losses as well as electromagnetic conductive and radiative noises. A single inductor-based resonant AC link snubber circuit specified as one of auxiliary resonant commutation snubbers to achieve the ZVS for the three-phase voltage source type inverter operating under a principle of specific instantaneous space voltage vector sinewave modulation is originally demonstrated as compared with the other types of resonant AC link snubber circuit topologies. In addition to this, its operation principle and unique features are described in this paper. The practical basic operating performances of the new conceptual instantaneous space voltage vector modulated three-phase voltage source soft-switching inverter are evaluated and discussed on the basis of waveforms quality evaluations on the output line to line voltage, power loss analysis, power conversion efficiency and electromagnetic conductive and radiative noise from an experimental point of view, comparing with three-phase voltage source hard-switching inverter.

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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

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

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.

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

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

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

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.

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

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

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.

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