Quadratic boost converter with switched capacitor and coupled inductor for PV system applications

A quadratic boost converter topology based on a high conversion ratio dc/dc converter with an active zero-voltage switching (ZVS) snubber circuit is developed for PV system application. Combined with a reboost inductor, a coupled inductor and charge-pump circuits are proposed to achieve high voltage gain with quadratic function. A front inductor is proposed to reboost the voltage gain to make the output voltage higher. The converter operating principle of the proposed conversion scheme is described in the detailed converter analysis. Simulation and experimental results are used to verify and validate the performance of the quadratic boost converter with the fuzzy maximum power point tracking controller (MPPT) in the PV inverter system.