Analysis and Implementation of a current-driven ZCS full-bridge converter with reduced voltage overstress on the switches

This paper presents the design and analysis of a new current-driven zero current switched full-bridge converter. The proposed converter reduces the voltage overstress on the switches. It contains a snubber circuit formed by a switched capacitor circuit and a resonant inductor, connected in the primary side of the coupling transformer. In this converter, the transformer leakage inductance is used as a part of the resonant circuit. There is no extra voltage stress on the switches. Analysis and implementation of the proposed converter are presented in this paper. A 12-Vdc/120-Vdc, prototype has been built and evaluated. The experimental results confirmed the theoretical predictions.