High efficiency converter with charge pump and coupled inductor for wide input photovoltaic AC module applications

Existing photovoltaic (PV) panels have widely varying input voltages based on the panel configuration and size. In this paper, a novel topology with a single active switch — combining boost, flyback, and charge-pump circuits — is proposed in order to achieve wide input range, high voltage gain, high efficiency, and low cost simultaneously. It meets the input-voltage and power-level needs of the majority of modern PV panels while still being suitable for connection with a highvoltage dc bus. The circuit has been designed, simulated, and implemented with the 20 to 70 V input, 200±20 V output, and 220 W output power as a part of a PV ac module. Experimental results verify the validity of the novel circuit and show 97.4% peak efficiency and greater than 96.3% for 50 to 220 W.