Faculty Profiles - HIRAKI Eiji

Papers - HIRAKI Eiji

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Lagrangian-Based Derivation of a Novel Sliding-Mode Control for Synchronous Buck Converters

Kazuhiro Umetani, Masayoshi Yamamoto, Eiji Hiraki

IEEJ JOURNAL OF INDUSTRY APPLICATIONS 4 ( 6 ) 728 - 729 2015

Passive Regenerative Turn-off Snubber Composed of Two Diodes and a Capacitor for Two-Phase Interleaved Boost Chopper

Kazuhiro Umetani, Eiji Hiraki, Masayoshi Yamamoto

2015 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC) 2015

Reactive Power Control Strategy Based on DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

Tint Soe Win, Toshihiko Tanaka, Masayuki Okamoto, Yoshihiro Hisada, Eiji Hiraki, Seong Ryong Lee

IEEJ JOURNAL OF INDUSTRY APPLICATIONS 4 ( 3 ) 158 - 165 2015

High-frequency Induction Heating for Tiny Foreign Metals

Shinya Kurachi, Naoki Yamamoto, Hiroaki Yamada, Toshihiko Tanaka, Eiji Hiraki, Yukiharu Yamada, Tatsuya Nagao, Yasuhiro Miyake, Yujiro Noda

2015 9TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND ECCE ASIA (ICPE-ECCE ASIA) 2203 - 2208 2015

Peak Power Shaving of an Electric Injection Molding Machine With Supercapacitors

Hirofumi Akiyoshi, Eiji Hiraki, Toshihiko Tanaka, Masayuki Okamoto, Tadayoshi Matsuo, Kiyoshi Ochi

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 50 ( 2 ) 1114 - 1120 2014.3

MHz-class High-frequency Soft-switching GaN-based Inverter for Wireless Power Transmission via Electromagnetic Resonance

Keisuke Yoshizawa, Toshihiko Tanaka, Eiji Hiraki, Masayuki Okamoto

2014 INTERNATIONAL ELECTRONICS AND APPLICATION CONFERENCE AND EXPOSITION (PEAC) 451 - 455 2014

A High-Frequency Link AC-AC Converter for Contactless Power Supply System in Parking Tower

Kawano Shingo, Hiraki Eiji, Tanaka Toshihiko, Okamoto Masayuki

IEEJ Transactions on Industry Applications 134 ( 2 ) 139 - 146 2014

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

This paper proposes a new concept for a contactless power supply system (CPS) in a mechanical multi-level parking tower for plug-in hybrid vehicles (PHVs) and electric vehicles (EVs). In recent years, PHVs and EVs have been commercialized as low environmental impact vehicles, and the demand for such vehicles is spreading rapidly. To cater to this increasing demand of PHVs and EVs, battery charging systems in the parking tower are necessary. Most multi-level parking towers have movable parking pallets that are electrically isolated from the building side. Because of the poor positional accuracy of the movable pallets, a contactless power transmission system between the utility grid in the building and the movable pallet is necessary. As for the CPS in the parking tower, a power conversion stage from commercial AC to high-frequency AC is necessary for size reduction. In general, such a power conversion system consists of power factor correction (PFC) converters and high-frequency inverters. Therefore, two or more conversion stages are necessary, which increases the power losses and cost. In this paper, a simple circuit configuration of a high-frequency link AC-AC converter for a CPS in a parking tower is proposed. The proposed high-frequency link AC-AC converter can directly convert commercial AC to high-frequency AC (HFAC) and HFAC to commercial AC again. Experiments are performed to demonstrate the validity of the proposed CPS. The proposed CPS is found to have a coupling coefficient of 0.75 for a contact-less transformer with a 10mm gap, and an efficiency of 86% can be achieved.

DOI： 10.1541/ieejias.134.139

Multiple-Output High-Frequency Inverter for IH Cooking Appliances

Hirokawa Takayuki, Hiraki Eiji, Tanaka Toshihiko, Imai Makoto, Yasui Kenji, Sumiyoshi Shinichiro

IEEJ Transactions on Industry Applications 134 ( 4 ) 477 - 478 2014

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

In this paper, a multiple-output high-frequency soft switching inverter is presented for home and business-use of IH cooking appliances. The proposed inverter is composed of parallel-connected single-switched multiresonant inverter cells. A detailed analysis indicates that the proposed inverter can control multiple-output power independently through a phase-shifted PWM scheme. The experimental results suggest that the prototype may be applied to multiple-output induction heating appliances.

DOI： 10.1541/ieejias.134.477

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Reactive Power Control without Load-Side Power Calculation for Smart Charger of Electric Vehicles on Single-Phase Three-Wire Distribution Feeders

Tanaka Hidenori, Tanaka Toshihiko, Okamoto Masayuki, Hiraki Eiji

Journal of the Japan Institute of Power Electronics 40 63 - 69 2014

Language：Japanese Publisher：The Japan Institute of Power Electronics

This paper proposes a novel reactive power control algorithm without load-side active power calculation for the previously proposed smart charger of Electric Vehicles (EVs) on single-phase three-wire distribution feeders. The basic principle of the proposed reactive power control algorithm is discussed in detail and then confirmed by digital computer simulation using PSIM software. A prototype experimental model is constructed and tested. Experimental results demonstrate that balanced source currents with a power factor of 0.9, which is acceptable value in Japanese regulation, are obtained on the secondary side of the pole-mounted distribution transformer during the battery charging operation.

DOI： 10.5416/jipe.40.63

Novel, Simple Reactive Power Control Strategy with DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

Tint Soe Win, Yoshihiro Hisada, Toshihiko Tanaka, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee

2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 3916 - 3921 2014

Reactive Power Control Strategy Based on DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

Tint Soe Win, Yoshihiro Hisada, Toshihiko Tanaka, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee

2014 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIROSHIMA 2014 - ECCE-ASIA) 3292 - 3297 2014

Novel control algorithm for active load balancer in three-phase four-wire distribution systems Reviewed

Tint Soe Win, Eiji Hiraki, Masayuki Okamoto, Seong Ryong Lee, Toshihiko Tanaka

IEEJ Journal of Industry Applications 3 ( 3 ) 286 - 287 2014

Reducing capacity of smart charger for electric vehicles on single-phase three-wire distribution feeders with reactive power control Reviewed

Hidenori Tanaka, Takaaki Wakimoto, Toshihiko Tanaka, Masayuki Okamoto, Eiji Hiraki

IEEJ Journal of Industry Applications 3 ( 6 ) 437 - 445 2014

A Novel Active Power Quality Compensator Topology with DC Voltage Balancer for Electrified Railways

Tint Soe Win, Eiji Hiraki, Toshihiko Tanaka

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 8 ( 6 ) 634 - 639 2013.11

Smart Charger for Electric Vehicles With Power-Quality Compensator on Single-Phase Three-Wire Distribution Feeders

Toshihiko Tanaka, Tsukasa Sekiya, Hidenori Tanaka, Masayuki Okamoto, Eiji Hiraki

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 49 ( 6 ) 2628 - 2635 2013.11

A Time-Sharing High-Frequency Inverter for All Metal IH Cooking Appliances

HIROKAWA Takayuki, HIRAKI Eiji, TANAKA Toshihiko, OKAMOTO Masayuki, NAKAOKA Mutsuo

IEEJ Transactions on Industry Applications 133 ( 7 ) 692 - 699 2013.7

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

In recent years, induction heating (IH) cookers using a high-frequency (HF) inverter for home use have become increasingly popular because of their cleanliness, high efficiency, safety, and so on. With regard to the domestic consumer markets, effective applicability to a variety of pan materials such as low resistivity materials (aluminum and copper) and high-resistivity materials (iron and magnetic stainless steel) is one of the important issues. In this paper, a time-sharing HF inverter for IH cooking appliances that enables doubling of the output frequency of the switching operation is proposed. The proposed HF resonant inverter is able to reduce switching losses by the frequency doubler and the soft-switching operation. Furthermore, the current rating of the switching power devices is reduced because of the parallel-connected circuit configuration. The basic principle of the proposed time-sharing HF inverter is discussed in detail. The performance and effectiveness of the proposed time-sharing HF inverter are confirmed by experimental point of view.

DOI： 10.1541/ieejias.133.692

Reduced-Capacity Smart Charger for Electric Vehicles on Single-Phase Three-Wire Distribution Feeders with Reactive Power Control

Hidenori Tanaka, Toshihiko Tanaka, Takaaki Wakimoto, Eiji Hiraki, Masayuki Okamoto

2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 5158 - 5164 2013

Resonant Gate Driver for Normally-On GaN High-Electron-Mobility Transistor

Takaharu Ishibashi, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Tamotsu Hashizume, Tetsu Kachi

2013 IEEE ECCE ASIA DOWNUNDER (ECCE ASIA) 365 - 371 2013

Experimental Validation of Newly Fabricated Normally-On GaN High-Electron-Mobility Transistor

Takaharu Ishibashi, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Tamotsu Hashizume, Daigo Kikuta, Tetsu Kachi

2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 1584 - 1591 2013

Sepic と Zeta コンバータの特性評価

中本貴之, 廣川貴之, 平木英治, 岡本昌幸, 田中俊彦

パワーエレクトロニクス学会誌 39 188 - 188 2013

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