Efficiency improvement of a SiC-MOSFET 500 kHz ZVS inverter

In order to further increase power density of residential PV inverter, a Zero-Voltage Switching (ZVS) full-bridge inverter with increased switching frequency of 500 kHz is investigated. According to the loss model, the loss distribution of the ZVS inverter is analyzed. In order to maintain high efficiency at 500 kHz switching frequency, resonant inductor design, optimized modulation of the ZVS inverter and layout are discussed. The main results are verified on a 1.5kW ZVS inverter prototype with 500 kHz switching frequency.