An isolated DC power supply free compact GaN inverter module

A low-cost and small size inverter module is required for a low-power motor system. In this work, we developed a compact GaN inverter module that is composed of GaN-GIT power devices and DBM (Drive-by-Microwave) gate drivers. The fabricated compact 5kW GaN inverter module successfully reduced its foot print for the gate drivers by 55% because it doesn´t require an isolated DC power source. The fabricated inverter module successfully realized 5.0kW motor drive and achieved the higher power conversion efficiency over a 96% under a low-output power (<1.0kW) due to the no threshold offset voltage of the GaN-GIT power device.