Analysis, design and evaluations of a soft switching PWM DC-DC converter with phase shift-controlled ZCS active hybrid rectifier

A new prototype of a secondary-side phase shifted (SPS) soft switching PWM dc-dc converter with an active rectifier is presented in this paper. In the proposed dc-dc converter, soft switching commutations are achievable from full load to no load by utilizing parasitic inductances of the high frequency (HF) transformer. Beside that, no circulating current exists in both of the primary and secondary side full-bridge circuits, consequently the related idling power can be minimized. The wide soft switching principle is described in details, and the circuit design guideline are introduced on the basis on the soft switching strategy. The essential performance and its practical effectiveness of the proposed dc-dc converter are originally demonstrated in experiments of a 1kW-50 kHz prototype.