High gain resonant boost converter for PV micro-converter system

This paper presents an isolated high-gain topology which employs resonant boost converter with coupled inductor or boost transformer for the Photovoltaic (PV) micro-converter system. The given configuration has the features of resonant soft switching, galvanic isolation, high gain and low switching losses. The proposed system uses LC series resonant tank circuit and had resonant operation both during turn-ON and turn-OFF. Further, the system operates near resonant frequency which minimizes the circulating or reactive current requirement in the resonant circuit. The proposed system operates in DCM mode with small losses during turn-OFF for the boost switch. Also, the proposed system has a wide operating voltage range for the PV source compared to existing solutions. In total, the given configuration has the benefits of coupled inductor technique, voltage doubler technique, resonant switching and galvanic isolation. Details of working principle, modes of operation and analysis with simulation and hardware results are presented in the manuscript.