A Dual-transformer DC–DC with Variable frequency modulation Technique

Abstract

For renewable power production systems to use less energy overall, power converters with improved efficiency over a wider load range are crucial. We introduce an unique dual-transformer DC-DC converter with many resonant components. With the right choice of resonance parameters, the converter can achieve a broad DC voltage gain range thanks to several resonance features. More resonance frequencies are included in the proposed converter as well, which will allow the load to receive more of the tertiary active power. Diodes achieve soft-switching or quasi-soft-switching during both the on and off periods, and all power switches are capable of on-soft switching. The proposed and analysis of variable frequency modulation (VFM) are achieved. By providing soft switching throughout the whole load range, the suggested modulation approach can lower switching losses. Additionally, the center-tapped bridge implementation of the synchronous rectifier further reduces conduction losses while the proposed modulation technique ensures soft switching of all devices. We installed a 500W prototype in the laboratory to confirm the theoretical analysis. According to the findings of the experiments, the suggested converter can maintain a relatively high efficiency (95%) throughout a wide load range. Starting with 300W, the highest efficiency is 95.4%.