Papers - OBARA Hidemine
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Over 99.7% Efficiency at 100 kW DC-DC Power Conversion using a 3.3 kV SiC Device and Discussion on Device dv/dt Estimation
Kawamura Atsuo, Tsuruta Yukinori, Obara Hidemine
IEEJ Journal of Industry Applications 13 ( 134 ) 426 - 436 2024.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人 電気学会 Joint Work
<p>This paper is a re-evaluation of a completed project (High Efficiency Demonstration Grant Using High Voltage SiC Device) from the perspective of accurate efficiency measurement; additionally, this paper discusses on device dv/dt estimation. A topology called the high-efficiency energy conversion system (HEECS), which is one variety of partial boost circuit topologies, is introduced to achieve efficiency over 99.5%. The topology exhibits a very high efficiency for applications in which the output voltage variation is within a certain ratio of the rated output voltage. This paper summarizes the basic features of the topology and theoretically derives the principle of high-efficiency realization. The high efficiency is measured by the back-to-back(BTB) connection of two converters, and the efficiency and accuracy on this method are theoretically derived and confirmed using the measured data of 3.3 kV output voltage at 100 kW output. The theoretical estimation of dv/dt for a 3.3 kV SiC device to reduce dual-active-bridge(DAB) soft-switching loss is discussed. Furthermore, a trend of DC-DC conversion efficiency is shown, and we show that the partial boost topology is a promising approach for achieving high efficiency dc-dc conversion.</p>
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パルス振幅制御を適用した9レベルDABコンバータによる出力電圧範囲拡大の検討
堤 昂哉, 小原 秀嶺
電気学会論文誌Ｄ 144 ( 6 ) 2024.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Single Work
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A Partial Active Gate Control for Improvement of a Trade-off Relation Between Surge Voltage and Efficiency in a Three-Phase Inverter
Van-Long Pham, Hidemine Obara, and Katsuhiro Hata
IEEE Transactions on Industry Applications 3 2024.1 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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Miguchi, Y; Obara, H; Kawamura, A
IEEE OPEN JOURNAL OF POWER ELECTRONICS 5 145 - 161 2024.1 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Survey of 99.9% Class Efficiency DC-AC Power Conversion and Technical Issues
Kawamura Atsuo, Miguchi Yasuhiko, Setiadi Hadi, Obara Hidemine
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 18 ( 1 ) 6 - 14 2023.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Miguchi Yasuhiko, Setiadi Hadi, Nasu Yoshiki, Obara Hidemine, Kawamura Atsuo
IEEE OPEN JOURNAL OF POWER ELECTRONICS 3 468 - 480 2022.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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A Modular Multilevel DC-DC Converter With Auxiliary Inductor Circuits for Cell Voltage Balancing and Fast Output Response
Hidemine Obara, Masaya Katayama, Atsuo Kawamura, Jin Xu, Noboru Shimosato
IEEE Open Journal of Power Electronics 3 391 - 401 2022.6 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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Setiadi Hadi, Obara Hidemine
IEEJ Journal of Industry Applications 11 ( 3 ) 522 - 530 2022.5 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人 電気学会 Joint Work
<p>This study discusses a multilevel cascaded linear amplifier that includes multiple H-bridges. The amplifier operates the MOSFETs in the switch mode and active state. The MOSFETs in the switch mode change the voltage level to reduce the ripple voltage, which is filtered using the MOSFETs in the active state. Thus, the conversion efficiency of the amplifier is improved. The MOSFETs in the switch mode also control the charging state of the capacitor on the DC-side of each H-bridge to maintain the DC capacitor voltages. The amplifier can perform real power conversion with one DC voltage source as it can regulate the DC capacitor voltage of each H-bridge. Moreover, DC capacitor voltages are regulated at various values to further reduce the ripple filtered by MOSFETs in the active state. Lastly, DC capacitor voltage control was verified through a experiment using three H-bridges, and the measured conversion efficiency of the amplifier with unequal DC capacitor voltages was 87.9%.</p>
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Almachius Kahwa, Hidemine Obara, Yasutaka Fujimoto
IEEE Open Journal of Power Electronics 3 182 - 196 2022.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Kawamura Atsuo, Nasu Yoshiki, Miguchi Yasuhiko, Setiadi Hadi, Obara Hidemine
IEEJ JOURNAL OF INDUSTRY APPLICATIONS 11 ( 1 ) 175 - 184 2022.1 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人 電気学会 Joint Work
<p>In this study, a virtual transformer-based loss measurement method is proposed for inverter power conversion efficiency measurements, and the accuracy of this method is theoretically analyzed. This concept is further extended to a practical measurement procedure, wherein asynchronous loss measurements are conducted for powering and regenerating operations using a single set of measurement instruments. The average efficiency can be obtained with a very high accuracy after calibration of the measurement instruments. A high-efficiency system inverter was selected as the converter under test, and its efficiency and accuracy were experimentally measured and validated. An efficiency of 99.75% ± 0.006% was obtained at an output of 1600W.</p>
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Yamaguchi Daiki, Cheng Yu Shan, Mannen Tomoyuki, Obara Hidemine, Wada Keiji, Sai Toru, Takamiya Mak … Show more authors
Yamaguchi Daiki, Cheng Yu Shan, Mannen Tomoyuki, Obara Hidemine, Wada Keiji, Sai Toru, Takamiya Makoto, Sakurai Takayasu Hide authors
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 58 ( 1 ) 481 - 493 2022.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Obara Hidemine, Ohno Tatsuki, Kawamura Atsuo
IEEE ACCESS 9 159627 - 159639 2021.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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57 ( 1 ) 614 - 627 2021.1 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Kawamura Atsuo, Nakazaki Satoshi, Ito Shogo, Nagai Sakahisa, Obara Hidemine
IEEJ JOURNAL OF INDUSTRY APPLICATIONS 9 ( 6 ) 663 - 673 2020.11 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人 電気学会 Joint Work
<p>A DC-AC conversion efficiency of over 99.7% is experimentally measured using a two battery high efficiency energy conversion system (HEECS) inverter. The accuracy of the efficiency measurement is evaluated by two methods: the direct measurement method and the loss breakdown method. After several measurements, calculations and analyses it is concluded that the measurement error based on the loss breakdown method is 0.04%.</p>
Other Link： https://ci.nii.ac.jp/naid/130007934370
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Kosode Yoshiki, Obara Hidemine, Kawamura Atsuo, Hosoyamada Yu, Suenaga Toyoaki, Yuzurihara Itsuo
IEEJ JOURNAL OF INDUSTRY APPLICATIONS 9 ( 4 ) 444 - 452 2020.7 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人 電気学会 Joint Work
<p>One-cycle current deadbeat and half-cycle current deadbeat are implemented to a two-phase interleaved DC-DC buck converter. It is confirmed that output voltage driven and outputted by half-cycle current deadbeat is more stable. When the capacitance of LC filter was reduced 3.22µF to 1µF, rise time, step-up duration of 40V to 120V, is shortened to 10.3µs significantly.</p>
Other Link： https://ci.nii.ac.jp/naid/130007868249
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Application of Multi-Level Converter for Fast Current Control in Small-Scale DC Power Network
Masaya Katayama, Tatsuki Ohno, Hidemine Obara, and Atsuo Kawamura
IEEE Transactions on Industry Applications 55 ( 3 ) 2902 - 2909 2019.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Active Gate Control in Half-Bridge Inverters Using Programmable Gate Driver ICs to Improve both Surge Voltage and Converter Efficiency
Hidemine Obara, Keiji Wada, Koutaro Miyazaki, Makoto Takamiya, and Takayasu Sakurai
IEEE Transactions on Industry Applications 54 ( 5 ) 4603 - 4611 2018.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Joint Work
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Half Cycle Iref Deadbeat Control of Two-phase Interleaved DC-DC Buck Converter for High/Low Voltage Pulse Generation
Atsuo Kawamura, Hidemine Obara,Hiromi Adachi, Yoshiki Kosode
European Conference on Power Electronics and Applications (EPE) 2018 ECCE-Europe 2018.9
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Multi-Level Topology Based Linear Amplifier Family for Realization of Noise-Less Inverters
Hidemine Obara, Tatsuki Ohno, and Atsuo Kawamura
International Power Electronics Conference (IPEC) -ECCE Asia2018 1649 - 1654 2018.5
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Fast and Robust Nonlinear Deadbeat Current Control for Boost Converter
Aviti Thadei Mushi, Sakahisa Nagai, Hidemine Obara, and Atsuo Kawamura
IEEJ Journal of Industry Applications 6 ( 5 ) 2017.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEJ Joint Work
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次世代直流電力ネットワークにおけるパワーフロー制御のための基本制御方式の検討
名取 賢二, 吉川 晃平, 小原 秀嶺, 佐藤 之彦
電気学会産業応用部門誌 136 ( 4 ) 277 - 284 2016.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Selection Criteria of Capacitors for Flying Capacitor Converters
Hidemine Obara and Yukihiko Sato
IEEJ Journal of Industry Applications 4 ( 2 ) 2015.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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マルチレベルインバータにおけるPWM出力波形の高調波理論解析
小原 秀嶺, 小栗 寛司, 佐藤 之彦
電気学会産業応用部門誌 134 ( 1 ) 59 - 67 2014.1 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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フライングキャパシタマルチレベル変換器におけるキャパシタ選定指針に関する検討
小原 秀嶺, 釜我 昌武, 伊藤 拓巳, 佐藤 之彦
電気学会産業応用部門誌 131 ( 12 ) 1393 - 1400 2011.12 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work