A novel ZCS-PWM full-bridge converter with a simple active auxiliary circuit

A new soft-switching PWM full-bridge converter is proposed in this paper. The outstanding feature of the new converter is that it allows its main power switches to operate with zero current switching (ZCS) and with fewer conduction losses than conventional full-bridge converters. This is achieved by using a very simple active auxiliary circuit and a few passive components. The paper presents the new converter and then discusses its operation, steady-state characteristics and design. Experimental results obtained from a converter prototype are presented to validate the converter's performance and the concepts presented in the paper.