Analysis of current-fed full bridge converter with modified auxiliary circuit

A new zero current switching (ZCS) pulse width modulation (PWM) dc-dc current fed full-bridge boost converter is proposed in this paper. In current fed isolated converters, an auxiliary circuit is essential to clamp high transient voltage across bridge switches caused by transformer leakage inductance. The proposed converter has auxiliary circuit that can transfer clamped energy from primary side of converter to the output. Further the auxiliary circuit is also utilized for soft switching of bridge switches. In this paper, the operation of the proposed converter is explained in detail, and its features and design are discussed. Simulation results are presented to verify the improved performance of proposed converter.