A fully soft-switched extended-period quasi-resonant power-factor-correction circuit

Authors:
  • KCK.W.E. Cheng
    K.W.E. Cheng
  • SPS.R.N. Prakash
    S.R.N. Prakash
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Abstract
This paper presents the design criteria, procedure, and implementation of a soft-switched power-factor-correction (PFC) circuit based on the extended-period quasi-resonant (EPQR) principles. All power electronic devices including switches and diodes in the circuit are fully soft switched. The design method is demonstrated in a prototype circuit. The operating principles are confirmed with computer simulation and experimental results. A comparison of the EP-QR operation and zero-voltage-transition (ZVT) pulse-width modulation (PWM) method.