ZVS-PWM Forward Converter with A Simple ZCS-PWM Auxiliary Circuit

In this paper a novel zero-voltage-switching (ZVS) pulse-width-modulated (PWM) forward DC/DC converter with a simple auxiliary circuit is proposed. The auxiliary circuit switched at zero current (ZCS). The auxiliary circuit is configured in the presented ZVS-PWM forward converter to perform soft-switching in the semiconductor devices and soft commutation of the main switches without additional current stress. Eight transition states for describing the behavior of the ZVS-PWM forward converter in one switching period are described.