Self-powered active rectifier circuit and related method of operation for photovoltaic solar power arrays

摘要

The active rectifier circuit and related method of operation disclosed herein is self-powered and improves the efficiency and reliability of photovoltaic solar power systems by replacing the conventional bypass and blocking rectifiers used in such systems. The circuit includes a power MOSFET used as a switch between the anode and cathode terminals, and control circuitry that turns on the MOSFET when the anode voltage is greater than the cathode voltage. The method of operation utilizes resonance to produce a large periodic voltage waveform from the small anode-to-cathode dc voltage drop, and then converts the period voltage waveform to a dc voltage to drive the gate of the power MOSFET.