Analysis and experimental verification of a single‐switch high‐voltage gain ZCS DC–DC converter

This study proposes and analyses the integration of soft‐switching technique with a single switch, non‐isolated, coupled inductor DC–DC converter to achieve high efficiency and high step‐up conversion ratio. The topology optimally integrates the coupled inductor and soft‐switching technique using a parallel LC resonant tank circuit to maintain zero‐current switching (ZCS) for on/off switching. The leakage inductance of the coupled inductor alleviates the reverse‐recovery issue of diodes, and diodes can operate under ZCS condition. Moreover, the converter operates in a lower frequency range due to high step‐up voltage gain. The principle of operation and steady‐state analyses of the proposed converter are presented. A prototype validates the theoretical analysis and demonstrates a higher peak efficiency of 96.43% than the corresponding hard‐switched converter.