Single Active Switch High Voltage Gain DC-DC Converter with Reduced Devices Stress

Abstract

This paper proposes a non-isolated high voltage gain dc-dc converter with reduced voltage stress across semiconductor devices. Coupled inductors and switched capacitor network are the two boosting techniques employed for attaining high voltage gain. The stored energy in leakage inductance is recycled and utilized to enhance the output voltage with the help of a passive clamp circuit. Equivalent circuits for different modes are used to explain the operating principle of the converter and finally, the design expressions are presented. A laboratory prototype of 400 W with an input voltage of 25–50 V and regulated output voltage of 400 V is fabricated and obtained experimental results are provided to justify the workability of the converter.