Three Winding Coupled Inductor Based Interleaved High Step Up Converter

Abstract

This paper presents a three winding coupled inductor based interleaved high step up converter for fuel cell based applications. The main aim is to reduce the ripple voltage on output side and to increase the output voltage. Also, the design is to reduce the voltage stress in order to achieve the ZVS (Zero Voltage Switching) and to reduce the leakage current in soft switching method. Converter is designed for high frequency range of 20 kHz is simulated. The output side connects the T-filter to reduce the output ripple voltage. The converter achieves high step-up voltage gain with appropriate duty ratio and low voltage stress on the power switch. By adjusting the turn s ratio of coupled inductor high step up gain can be achieved. Additionally, the energy stored in the leakage inductor of the coupled inductor can be recycled to the output capacitor. Low rated switch with low RDS-ON reduces conduction losses. Circuit simulations of open loop results are presented and are shown to have excellent agreement with the fundamental analysis.