Soft Switching of Phase Shifted Full Bridge DC-DC Converter

Abstract

Phase shifted full bridge dc-dc converter circuit is presented in this paper. The circuit used for soft switching. Auxiliary cell is connected parallel to the full bridge converter part to achieve softness. The auxiliary cell consist of an active switches, a resonant inductor, a resonant capacitors and coupled winding derived from centre tapped transformer. The auxiliary switches are activated in proper interval to ensure the zero voltage switching to the main switches of converter. The auxiliary circuit create zero voltage switching without any change in voltage/current rating of main switches.