A Non-Isolated High Gain Step-Up DC/DC Converter Based on Coupled Inductor with Reduced Voltage Stresse

Hybrid electric vehicles (HEVs) have attracted much attention due to their better energy economy and have now become a major mode of urban transportation systems. The DC/DC converter is one of the most important components in the energy conversion system of a hybrid vehicle. In order to match the voltage level between the battery and the DC bus, this paper presents a novel DC/DC converter with high gain and a wide input voltage range based on coupled inductors. As the required power interface, the converter implements ZVS and ZCS to reduce the voltage/current stress on the power switch. The proposed topology includes a resonant cavity that significantly reduces losses during switch operation. The detailed operating modes of the proposed converter are analyzed, and the conditions for the realization of voltage stress, voltage gain, and soft switching are derived. Based on the dsPIC33FJ64GS606 digital controller, a prototype rated at 300W is built and achieves high efficiency 90% at a voltage gain of 10 times. The experimental results successfully validate the effectiveness of the proposed converter.