Single-Switch DC-DC Converter Topology for High Voltage Gain

Abstract— This paper proposes a novel high voltage gain DC-DC converter topology designed for renewable energy applications. The converter utilizes a coupled inductor with its primary winding connected to the input, which ensures continuous input current a desirable feature for renewable energy sources (RES). The proposed topology operates using a single power switch, and a clamping circuit is employed to reduce the voltage stress across this switch. As a result, conduction losses in the main switch are minimized. Furthermore, the clamping circuit effectively recycles the energy stored in the leakage inductance of the coupled inductor by charging a capacitor placed across the switch. This energy recycling improves overall efficiency. The converter is designed with fewer components, and the voltage stress across the power switch and diodes is significantly reduced. Consequently, low-voltage-rated components can be selected, leading to cost reduction and enhanced efficiency. Additionally, by altering the connected inductor's turns ratio, the voltage gain can be raised. Both simulation and experimental prototype results show how effective the suggested converter is. Keywords: DC-DC converter, passive clamping, reverse recovery, two-winding coupled-inductor, leakage inductance low voltage stress.