Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Constant on-time variable frequency control for critical conduction mode GaN-based totem-pole PFC converters

  • Shuang Zhang (College of Electrical, Energy and Power Engineering, Yangzhou University) ;
  • Yu Fang (College of Information Engineering, Yangzhou University) ;
  • Kaixin Shu (College of Information Engineering, Yangzhou University) ;
  • Qiuyang Gu (College of Information Engineering, Yangzhou University) ;
  • Xuehua Wang (School of Electrical and Electronic Engineering, Huazhong University of Science and Technology)
  • Received : 2023.03.13
  • Accepted : 2023.07.25
  • Published : 2023.12.20
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Abstract

A constant on-time variable frequency control (COTVFC) with feed-forward for a critical conduction mode (CRM) totem-pole power factor correction (PFC) converter is proposed in this paper. This control method only requires a single voltage loop, where the output is taken as the on-time of the main switches of the converter. The off-time of the main switches in different switching cycles is calculated by the voltage-second balance principle, which ensures that the converter always operates in the CRM. Feed-forward is introduced to improve the dynamic response of the converter. The control model is established and the transfer function from the on-time to the output is derived. On this basis, the control parameters of the voltage loop are designed. Then a simulation model is built in PSIM for simulation verification. Finally, a two-phase interleaved parallel GaN-based totem-pole PFC converter prototype is made for experimental verification. Simulation and experimental results verify the feasibility and effectiveness of the control method proposed in this paper.

Keywords

Acknowledgement

This paper was supported in part by the National Natural Science Foundation of China under Grant 52277181, in part by the Science and Technology Cooperation Fund of Yangzhou City Hall project under Grant YZ2018136, in part by the Industrial Foresight and Universal Key Technology Research and Development Project (Preliminary guidance / Installment funding) of Zhenjiang Science and Technology project under Grant GY2021017, and in part by the Industrial Foresight and Universal Key Technology Research and Development Project (Industrial prospective technology R & D) of Yangzhou Science and Technology project under Grant YZ2022005.

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