Introducing Soft Switching High Step – up Converter with Low Input Current Ripple for Green Energy Applications

This paper introduces a non-isolated step-up converter featuring coupling inductors and a voltage multiplier circuit with soft switching. By connecting the secondary coupling inductors in series, the current ripple at the input is minimized, while the multiplier circuit reduces voltage stress on the main power circuit switches. This reduction in voltage on the power MOSFETs and diodes leads to decreased conduction losses and lower circuit costs. Additionally, the large capacitor absorbs the energy from the leakage inductor and transfers it to the output, mitigating the reverse recovery issues of the diodes caused by zero-current switching and ensuring zero-voltage switching for all switches. To validate the converter's performance, a practical 200W prototype was constructed, demonstrating an efficiency of 94.2% under nominal load conditions.