Faculty Profiles - HIRAKI Eiji

Papers - HIRAKI Eiji

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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

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

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

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

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

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

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

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

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

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

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

Language：Japanese Publisher：The Japan Institute of Power Electronics

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

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

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

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

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

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

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

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

Language：Japanese Publisher：The Japan Institute of Power Electronics

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

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

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

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

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

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

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

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

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

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

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

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

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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