Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Design of high efficiency phase-shift full-bridge converter with minimized power loss on primary-side clamp diodes

  • Young‑Eun Kwon (Department of Electrical and Electronic Engineering, Gyeonsang National University) ;
  • Young‑Woo Ju (Department of Electrical and Electronic Engineering, Gyeonsang National University) ;
  • Da‑Un Kim (Department of Electrical and Electronic Engineering, Gyeonsang National University) ;
  • Chong‑Eun Kim (Department of Control and Instrumentation Engineering, Gyeonsang National University)
  • Received : 2022.08.05
  • Accepted : 2022.10.26
  • Published : 2023.01.20
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Abstract

Phase-shift full-bridge (PSFB) converter is a full-bridge converter that adopts a phase-shift control scheme to achieve zero-voltage-switching (ZVS). Owing to its low voltage/current stress, it is popular for high efciency and high power density applications. Practically, to reduce the high peak voltage of secondary rectifers, its confguration contains clamp diodes on the primary side. However, this circuit confguration causes additional power loss due to the current fowing through the clamp diodes. In this paper, an additional capacitor applied to PSFB converter is proposed to reduce unnecessary power loss, and its validity is proved experimentally by an 800 W power supply.

Keywords

Acknowledgement

This work was supported by the National Research Foundation (NRF) of Korea grant funded by the Korea government (MSIT) under Grant 2020R1A2C1005737. The key concept was proposed in [13] and the additional comparison with other converters has been described in the Introduction. Then, the efect of parasitic capacitances is investigated, and the detailed operations are analyzed according to 5 operating modes. The design guideline for additional capacitor CA and ZVS parameters are described. Furthermore, the effectiveness of the proposed converter in wide load range is proved out by additional waveforms captured at 5% and 50% loads.

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