A Large Voltage Gain and High Output Power Boost Converter for PV Sources Directly Convertible to 400 V DC Microgrid

Abstract

A 4-coil boost DC-DC converter circuit with a large voltage gain and high output power is proposed. The target application is the 400 V DC microgrid, and the converter boosts a 20 V photovoltaic (PV) module voltage directly to the 400 V microgrid voltage using the multiphase control scheme. Four coils in 4 different clock phases are used to drive 3 parallel series-capacitor boost converters. Only one-fourth and one-half of the output voltage is required for the reverse bias voltage of transistor switches and diodes, respectively, and reliability problems are avoided. The proposed converter circuit was SPICE simulated using device parameters from commercially available transistors and diodes, and from inductors and capacitors with parasitic components. Simulation results indicate that 1.5 A and a 370 V of the output current and voltage, respectively, are obtained with more than 90 % of power efficiency. The device count of the circuit was only 16.