A flyback constant frequency ZCS-ZVS quasi-resonant converter

Abstract The analysis and simulation of a flyback zero current switching-zero voltage switching quasi-resonant converter operating at a constant switching frequency are discussed. Its output voltage is regulated by controlling the free-wheeling period of the resonant inductor. In addition to better controllability, it possesses the advantages of PWM and frequency-modulated converters. The principle of operation, steady state characteristics, design procedure and simulation of flyback constant frequency zero current switching-zero voltage switching quasi-resonant converter (CFZCSZVSQRC) are presented. A prototype of this converter is implemented.