- 著者
- Shotaro Takahashi Keiji Wada Hideki Ayano Satoshi Ogasawara Toshihisa Shimizu
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Journal of Industry Applications (ISSN:21871094)
- 巻号頁・発行日
- pp.21006800, (Released:2021-08-13)
- 被引用文献数
- 11
The switching frequency of power converters is continuing to increase with the demand for their increased power density. Therefore, the frequency band of the electromagnetic interference (EMI) generated by power converters ranges from several kilohertz to 100 MHz or more, thereby increasing the importance of EMI countermeasures in power converters. In addition, with the practical applications of smart grids and microgrids and the introduction of 5G technology, cases wherein power converters and information communication devices are placed in close proximity are continuing to increase. Thus, in societies wherein power converters and information communication devices are highly integrated, it is necessary to ensure electromagnetic compatibility based on a different concept. This paper presents a review on modeling and suppression techniques for the EMI generated by power converters and discusses future prospects in this field.
- 著者
- Koji Orikawa Satoshi Ogasawara Masatsugu Takemoto Jun-ichi Itoh
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Journal of Industry Applications (ISSN:21871094)
- 巻号頁・発行日
- vol.10, no.3, pp.370-376, 2021-05-01 (Released:2021-05-01)
- 参考文献数
- 20
This paper proposes a 2.5MHz high-frequency output inverter based on a frequency multiplying technique with a multi-core transformer using Mn-Zn ferrite materials. The upper limit of the operation frequency for these materials is lower than the output frequency of 2.5MHz. First, the operation principle of the proposed circuit is explained. Second, a difficulty of using Mn-Zn for transformers at the frequency of 2.5MHz is discussed. Third, a numerical analysis shows that the proposed circuit can output the frequency over the upper limit of the operation frequency of Mn-Zn ferrite. Finally, through continuous operation, where the proposed circuit outputs approximately 650W, it is experimentally confirmed that Mn-Zn ferrite can be used without large iron loss at the output frequency of 2.5MHz. Thus, the proposed circuit can overcome the difficulty of using Mn-Zn for transformers at the frequency of 2.5MHz.
- 著者
- Shotaro Takahashi Keiji Wada Hideki Ayano Satoshi Ogasawara Toshihisa Shimizu
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Journal of Industry Applications (ISSN:21871094)
- 巻号頁・発行日
- vol.11, no.1, pp.7-19, 2022-01-01 (Released:2022-01-01)
- 参考文献数
- 152
- 被引用文献数
- 11
The switching frequency of power converters is continuing to increase with the demand for their increased power density. Therefore, the frequency band of the electromagnetic interference (EMI) generated by power converters ranges from several kilohertz to 100MHz or more, thereby increasing the importance of EMI countermeasures in power converters. In addition, with the practical applications of smart grids and microgrids and the introduction of 5G technology, cases wherein power converters and information communication devices are placed in close proximity are continuing to increase. Thus, in societies wherein power converters and information communication devices are highly integrated, it is necessary to ensure electromagnetic compatibility based on a different concept. This paper presents a review on modeling and suppression techniques for the EMI generated by power converters and discusses future prospects in this field.
- 著者
- Hirofumi Akagi Satoshi Ogasawara Hyosung Kim
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- IEEJ Transactions on Industry Applications (ISSN:09136339)
- 巻号頁・発行日
- vol.119, no.12, pp.1461-1470, 1999-12-01 (Released:2008-12-19)
- 参考文献数
- 18
- 被引用文献数
- 5
This paper discusses “the p-q theory” and “the cross-vector theory” in three-phase four-wire systems, with the focus on similarity and difference between the two theories. They are perfectly identical if no zero-sequence voltage is included in a three-phase three-wire system. However, they are different in definition of the instantaneous active power and instantaneous reactive power in each phase if a zero-sequence voltage or current is included in a three-phase four-wire system. Based on both theory and computer simulation, this paper leads to the following conclusions: An instantaneous reactive-power compensator without energy storage components can fully compensate for the neutral current even in a three-phase four-wire system including a zero-sequence voltage or current, when a proposed control strategy based on the p-q theory is applied: However, the compensator cannot compensate for the neutral current fully, when a conventional control strategy based on the cross-vector theory is applied.
- 著者
- Eli Kaminuma Yukino Baba Masahiro Mochizuki Hirotaka Matsumoto Haruka Ozaki Toshitsugu Okayama Takuya Kato Shinya Oki Satoshi Ogasawara Hisashi Kashima Toshihisa Takagi
- 出版者
- The Molecular Biology Society of Japan
- 雑誌
- The 39th Annual Meeting of the Molecular Biology Society of Japan
- 巻号頁・発行日
- 2016-11-08