A Novel ZVS PWM Phase-shifted Full-bridge Converter with Controlled Auxiliary Circuit

A new topology of full-bridge converter is proposed featuring zero-voltage-switching (ZVS) of active switches over a wide range of input voltage and load. In contrast to conventional techniques, the current through the auxiliary inductor of the proposed converter is controlled by the load current. Therefore, the ZVS operation over the wide conversion range is achieved without significantly increasing full-load conduction loss. The operation principle is described and the design considerations of converter are discussed. Performance of the proposed converter is verified with experiment results on a 1kW, 100 kHz full-bridge converter.