著者

福田 典子 舟木 剛

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.143, no.3, pp.196-204, 2023-03-01 (Released:2023-03-01)

参考文献数

26

被引用文献数

3

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This study aims to develop a power supply system without a traction transformer for weight reduction and downsizing. Transformer-less power supply is expected to realize step-down, rectification, isolation, and motor drive using a high voltage silicon carbide (SiC) power device. The primary challenge of this work is developing a novel circuit that isolates the motor drive circuit from the AC line without using the traction transformer. Accordingly, we devised a flying capacitor circuit to solve the existing problems and aims for capacitive isolation. Subsequently, we devise a nesting capacitor as a short-circuit prevention measure. We report the isolated circuit configuration and operating principle.

著者

舟木 剛 福永 崇平 井渕 貴章 福田 典子 中村 孝 柳澤 佑太

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.143, no.9, pp.636-643, 2023-09-01 (Released:2023-09-01)

参考文献数

21

被引用文献数

1

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This study develops a transformer-less power supply for AC railway vehicles. The rail on the permanent route of an AC electric railway is grounded. The proposed power supply circuit takes advantage of this feature and performs AC-DC power conversion without using a bridge circuit. The circuit topology is a combination of indirect type DC-DC converters. The operation and control of power conversion from AC to DC power run and from DC to AC regeneration is confirmed using numerical simulations. In addition, the operation of the proposed circuit is validated experimentally.

著者

赤松 慶治 道平 雅一 舟木 剛 河崎 善一郎 松浦 慶士

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.121, no.4, pp.442-448, 2001-04-01 (Released:2008-12-19)

参考文献数

19

被引用文献数

2

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In recent years, the harmonics and EMI noise sent out from an electric power conversion system are getting a great deal of attention in electromagnetic environment problems. So, the considerations for mentioned above have been getting important. Therefore, there is need to do a detail frequency analysis such as transient phenomena at the switching. So, we have proposed the analytic technique using Wavelet-transform which is possible to catch a phenomenon from the both sides of the time and the frequency. In this paper, we performed the analysis using Wavelet-transform against the actual measured date at the switching interval. Then, based on obtained result, we describe the high validity of Wavelet-transform and the application to the power electronics field.

著者

舟木 剛 井渕 貴章 中野 善大 吉竹 徹真 上小牧 隆磨 林 慧 杉木 勝哉

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.135, no.3, pp.131-134, 2015

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1.はじめに 聖徳太子が建立した1400年の伝統を誇る四天王寺の近くにそびえ立つ高さ300mの日本一高い超高層ビルが,2014 (平成26) 年3月にグランドオープンしたばかりの「あべ