Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Coupled inductor based zero-voltage-switching buck/boost converter

  • Wang, Shanshan (College of Electrical Engineering, Zhejiang University) ;
  • Hu, Yihua (Department of Electronics Engineering, University of York) ;
  • Gao, Ming (College of Electrical Engineering, Zhejiang University) ;
  • Shi, Jianjiang (College of Electrical Engineering, Zhejiang University) ;
  • Liu, Tao (Shanghai Institute of Space Power-Sources, China Aerospace Science and Technology Corporation)
  • Received : 2021.10.16
  • Accepted : 2022.03.14
  • Published : 2022.07.20
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Abstract

This paper proposes a zero-voltage-switching (ZVS) Buck/Boost converter (BBC). In addition, an auxiliary circuit based on a coupled inductor is introduced to realize ZVS for the main MOSFETs. The magnetic coupling inductor plays the role of filtering and provides ZVS conditions for the main MOSFETs. Since all of the switches can achieve soft switching conditions, and the conduction loss of the auxiliary circuit is small, the conversion efficiency for the overall system is improved. When compared with the traditional ZVS implementation methods based on magnetic coupling inductors used in Buck, Boost, and Buck/Boost converters, the proposed topology can prevent current notches on the current waveform of the input source. Since there are no notches on the input source current, when the proposed ZVS implementation method is applied to an interleaved parallel BBC structure, it has a smaller current ripple of the input source. Finally, experimental results are given and analyzed. Based on these results, both the ZVS conditions and efficiency improvement are verified.

Keywords

Acknowledgement

This research is supported by the National Natural Science Foundation of China (52077199).

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