Novel zero-voltage and zero-current-switching full-bridge PWM converter using a simple auxiliary circuit

A novel zero-voltage and zero-current-switching (ZVZCS) full-bridge pulsewi dth modulation converter is presented to simplify the circuits of the previ ously presented ZVSCS converters. A simple auxiliary circuit, which consist s of one small capacitor and two small diodes, is added in the secondary to provides ZVZCS conditions to primary switches, as well as to clamp seconda ry rectifier voltage, The additional clamp circuit for the secondary rectif ier is not necessary. The auxiliary circuit includes neither lossy componen ts nor additional active switches, which makes the proposed converter effic ient and cost effective. The principle of operation, features, and design c onsiderations are illustrated and verified on a 2.5-kW 100-kHz insulated-ga te-bipolar-transistor-based experimental circuit.