Soft‐switching bidirectional DC–DC converter with high voltage conversion ratio

Abstract

This study introduces a soft‐switching non‐isolated bidirectional DC–DC converter with high voltage conversion ratio and low voltage stress across semiconductor devices. The presented topology is well suited for high step‐up/step‐down applications. By integrating coupled inductors and switched capacitors techniques, a high step‐up/step‐down voltage gain is achieved. Active clamp circuits are employed in both high step‐up and high step‐down operating states to recycle the leakage inductance energy and realise zero‐voltage‐switching condition for all switches to mitigate the switching losses and improve efficiency. Also, the reverse recovery problem of the body diodes is completely alleviated owing to zero‐current‐switching performance. The operation principles and theoretical analysis of proposed converter are presented in details. Finally, the experimental results of a 200 W prototype circuit are provided to confirm the validity of the proposed topology.