Implementation of a soft switching DC/DC converter without reverse recovery loss for rectifier diodes

This study presents an interleaved soft switching converter to achieve ripple current reduction, zero‐voltage switching (ZVS) turn‐on for MOSFETs and zero‐current switching (ZCS) turn‐off for fast recovery diodes. Active snubber circuit is used in the proposed circuit to absorb the energy stored in the leakage inductor and to achieve ZVS turn‐on for power switches. The resonant tank composed of the leakage inductor and the resonant capacitor at the secondary side is used to achieve ZCS turn‐off for all rectifier diodes. The reverse recovery loss on rectifier diodes can be eliminated. Thus, the low‐cost fast recovery diodes can be used at the secondary side. The interleaved pulse‐width modulation scheme is used to control two converter cells in order to achieve load sharing and input ripple current reduction. Experiments with a 400 W prototype, verifying the effectiveness of the proposed converter, are described.