A hybrid isolated boost converter with reduced output capacitance and integrated auxiliary circuit for ZVS

This paper proposes a novel hybrid PWM-resonant isolated boost converter which has a low filter capacitance requirement owing to the two-stepped current waveform driving the output capacitor. An auxiliary circuit comprising of two switches and a parallel LC network is used to achieve zero-voltage-switching (ZVS) operation of the main MOSFETs. Evolution of the topology and basic circuit operation with and without the auxiliary circuit are explained. Finally some simulation and experimental results are presented.