A novel zero-voltage and zero-current-switching full-bridge PWM converter

A novel zero-voltage and zero-current-switching (ZVSZCS) full-bridge PWM converter is presented. There is no additional winding or additional active switches or lossy components in the proposed converter to achieve ZVSZCS conditions, moreover, the ZVSZCS conditions are achieved without added control, so the converter is efficient and cost effective. The ZVSZCS conditions of the primary are achieved by changing the traditional configuration of ZVS-full-bridge PWM converter: a simple auxiliary circuit is added in the secondary and the center tap of the transformer´s secondary is linked to the auxiliary circuit. The secondary rectifier voltage of the converter is clamped to a relative low level, so additional clamp circuit for the secondary rectifier is not necessary. The operation of the proposed converter is analyzed. And the experimental results of a 1.2 kW prototype prove the novel converter is successful.