Zero-voltage-switching/zero-current-switching soft-switching dual-resonant converter

A soft-switching converter with dual resonant structures is presented in this article. The dual resonant tanks are composed of the leakage inductors and resonant capacitors to achieve a zero-current-switching (ZCS) turn-off mechanism for diodes on the secondary side of the transformer. Moreover, the voltage stresses of power switches are clamped by the active clamp circuit on the primary side of the transformer. The active clamp circuit has not only absorbed the energy stored in the leakage inductor but also creates a zero-voltage-switching turn-on feature for power switches. Hence, the reverse-recovery problem can be eliminated. The operational principles, design considerations and realisation are discussed. Finally, the experimental results from a 400 W prototype are presented to confirm the effectiveness of the proposed converter.