The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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New Single-Phase AC-AC Converters With High-Reliability and Common-Ground Structure

새로운 공통접지 고신뢰성 AC-AC 전력변환기

  • Kim, Jeonghun (School of Energy Engineering, Kyungpook National University) ;
  • Cha, Honnyong (School of Energy Engineering, Kyungpook National University)
  • Received : 2021.07.26
  • Accepted : 2021.09.09
  • Published : 2021.12.31
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Abstract

This paper proposes enhanced single-phase pulse width modulation buck, boost, and buck-boost type ac-ac converters. The proposed converters, where input and output voltages share a common ground, require no isolated voltage sensor and have no leakage current problem. The commutation problem is solved with series-connected switching cell structures without using an additional RC snubber. In addition, with the use of the polarity of input voltage, switching patterns are determined so that the inductor currents can flow through switching devices during all operational modes. Two switches are always turned on during a half-period of the input voltage; thus, the switching loss is significantly reduced. Detailed analysis and experimental results are provided to verify the performance of the proposed converter.

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Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임. (NRF-2021R1A2C2007879)

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