Implementation of ZVDS Class-DE Bridge Rectifier with Series-Parallel Matching Network for High-Step Up ZVS Push-Pull Resonant Converter

This paper presents an implementation of a zero-voltage and zero-derivative-switching (ZVDS) Class-DE bridge rectifier with an LCC series-parallel matching network to improve an output voltage regulation from light load to heavy load of a high-step up zero-voltage switching (ZVS) push-pull resonant converter. The LCC series-parallel matching network is placed between the secondary side of the transformer and the ZVDS Class-DE bridge rectifier. The secondary leakage inductance and the junction capacitance of the rectifier diodes can be used as part of the resonant inductor and the resonant capacitor, respectively. Additionally, the proposed push-pull resonant converter has a soft-switching characteristic that reduces switching losses and switching noise. A prototype for a 200 W front-end DC/DC converter for distributed power generation based on 24 VDC battery as an energy storage and 400 VDC output voltage has been developed and tested to evaluate the performance of the proposed approach.