Normally-on SiC-JFET Cascode under ZVS conditions

Very fast switching speeds of Silicon Carbide (SiC) power transistors enable significant increases in switching frequency and power density in resonant converter applications. Zero voltage (ZVS) and zero current switching (ZCS) allow inverters to operate in MHz frequency range with minimized switching losses. For hard switching conditions, the normally-on SiC-JFET in a cascode circuit is already well understood. This study presents the switching performance of a JFET cascode with external snubber capacitances and switching waveforms of a ZVS full-bridge inverter at 2 MHz switching frequency.