Analysis and research of phase-shift push-pull forward ZVS converter

Abstract

Push forward converter is constrained by its switching loss under high frequency conditions, so it has to use heat sink to increase the volume of the converter, which is contrary to the design concept of small volume and high power density. Based on the traditional push-pull forward converter, this paper adopts phase-shifting control to realize ZVS of the primary side switch through LC resonance generated by the parallel capacitor of the primary side switch, the primary side leakage inductance and the secondary side filter inductance. At the same time, the dead time is set by calculating the duration of each mode in half a cycle. Finally, saber simulation is used to verify the feasibility of realizing ZVS of the push-pull forward converter, so as to provide a basis for the high power It provides a reference for the application under high frequency conditions.