論文 - 小原 秀嶺
件数 24 件-
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年7月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 電気学会 共著
<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年6月 [査読有り]
記述言語：日本語 掲載種別：研究論文（学術雑誌） 単著
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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年1月 [査読有り]
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 単著
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Miguchi, Y; Obara, H; Kawamura, A
IEEE OPEN JOURNAL OF POWER ELECTRONICS 5 145 - 161 2024年1月 [査読有り]
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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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年1月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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Miguchi Yasuhiko, Setiadi Hadi, Nasu Yoshiki, Obara Hidemine, Kawamura Atsuo
IEEE OPEN JOURNAL OF POWER ELECTRONICS 3 468 - 480 2022年7月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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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年6月 [査読有り]
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 単著
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Setiadi Hadi, Obara Hidemine
IEEJ Journal of Industry Applications 11 ( 3 ) 522 - 530 2022年5月 [査読有り]
DOI Web of Science CiNii Research
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 電気学会 共著
<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年3月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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Kawamura Atsuo, Nasu Yoshiki, Miguchi Yasuhiko, Setiadi Hadi, Obara Hidemine
IEEJ JOURNAL OF INDUSTRY APPLICATIONS 11 ( 1 ) 175 - 184 2022年1月 [査読有り]
DOI Web of Science CiNii Research
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 電気学会 共著
<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 … 全著者表示
Yamaguchi Daiki, Cheng Yu Shan, Mannen Tomoyuki, Obara Hidemine, Wada Keiji, Sai Toru, Takamiya Makoto, Sakurai Takayasu 閉じる
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 58 ( 1 ) 481 - 493 2022年1月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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Obara Hidemine, Ohno Tatsuki, Kawamura Atsuo
IEEE ACCESS 9 159627 - 159639 2021年11月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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Obara Hidemine, Ohno Tatsuki, Katayama Masaya, Kawamura Atsuo
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 57 ( 1 ) 614 - 627 2021年1月 [査読有り]
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE 共著
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Kawamura Atsuo, Nakazaki Satoshi, Ito Shogo, Nagai Sakahisa, Obara Hidemine
IEEJ JOURNAL OF INDUSTRY APPLICATIONS 9 ( 6 ) 663 - 673 2020年11月 [査読有り]
DOI Web of Science CiNii Research
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 電気学会 共著
<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>
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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年7月 [査読有り]
DOI Web of Science CiNii Research
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 電気学会 共著
<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>
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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年5月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE 共著
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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年9月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEE 共著
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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年9月
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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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年5月
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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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年9月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ 共著
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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年4月 [査読有り]
記述言語：日本語 掲載種別：研究論文（学術雑誌） 共著
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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年3月 [査読有り]
記述言語：英語 掲載種別：研究論文（学術雑誌） 共著
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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年1月 [査読有り]
記述言語：日本語 掲載種別：研究論文（学術雑誌） 共著
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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年12月 [査読有り]
記述言語：日本語 掲載種別：研究論文（学術雑誌） 共著