A Novel High-Efficiency Fully Soft-Switching High Step-Up DC–DC Converter Utilizing an Active Switched Inductor

This paper presents a novel DC-DC converter for high-step-up applications. The converter combines an active switched inductor (ASI) circuit and a snubber circuit to increase gain and provide soft switching for all semiconductor devices. With the use of a single-core coupled inductor, high voltage gain is achieved. The snubber circuit further contributes to the gain enhancement. The switches turn on under zero current switching (ZCS) conditions, while all diodes operate under ZCS. In addition, the snubber capacitor provides zero voltage switching (ZVS) when the switches turn off. The low voltage stress on the switches enables the use of switches with low on-resistance, which reduces conduction loss. Additionally, the advantage of current sharing leads to a greater reduction in switch conduction loss. The theoretical analysis of the proposed converter is explained in detail. Furthermore, a prototype with an input voltage of 40V and an output voltage of 400V is implemented to demonstrate the efficacy of the proposed topology.