A New ZVS-PWM Full-Bridge Converter

Abstract-A full-bridge converter which employs a coupled inductor to achieve zero-voltage switching of the primary switches in the entire line and load range is described. Because the coupled inductor does not appear as a series inductance in the load current path, it does not cause a loss of duty cycle or severe voltage ringing across the output rectifier. The operation and performance of the proposed converter is verified on a 670-W prototype. Index Terms-Coupled inductor, full bridge converter, phase shift control, zero voltage switching