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

The Korean Institute of Power Electronics (전력전자학회)
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A Study on the Soft-Switching Forward-Flyback Converter Using Auxiliary Inductor and Auxiliary Diode

보조 인덕터와 보조 다이오드를 적용한 소프트-스위칭이 가능한 포워드-플라이백 컨버터에 관한 연구

  • Lee, A-Ra (School of Electrical Eng., Kookmin University) ;
  • Park, Jun-Woo (School of Electrical Eng., Kookmin University) ;
  • Hong, Sung-Soo (KPEC, School of Electrical Eng., Kookmin University)
  • Received : 2016.07.08
  • Accepted : 2016.11.28
  • Published : 2017.04.20
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Abstract

This study proposes a new type of active-clamp forward-flyback converter with two transformers that operate in forward and flyback modes during on and off times, respectively, instead of not using an output inductor. The main switch can be turned on with zero-voltage switching (ZVS) using the leakage inductance of the transformer and the output capacitor of the main switch. The leakage inductance should be increased to ZVS. However, the ringing between the leakage inductance of the transformer and the parasitic output capacitance of the secondary side rectifier switches results in a serious voltage spike. A forward-flyback converter employing auxiliary inductor and auxiliary diode is proposed to overcome the problem. The operational principles are analyzed in detail and validated through experiments with a 385 V-to-53 V/37 A prototype.

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References

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