A new self-triggering gate drive for half- and full-bridge inverters driving LC resonant loads with enforced zero-voltage-switching (ZVS) is proposed in this paper (STZVS). It controls the switching frequency and automatically maximizes the load current amplitudes by detecting the reverse-conduction of power switches and the polarity of the load current. It has the advantages of not requiring the electrical isolation and level-shifter for the high side gate drive signals of the power inverter leg, and active and continuous computations of the driving frequency and duty ratio of the gate drive signals to maintain ZVS with load variations. The very small delay in the gate signal transmission enables the gate drive system to operate at frequency in the range from hundreds of kilo-Hertz (kHz) to several mega-Hertz (MHz). The mathematical model, simulation model and experiment verification are included. It is suitable for high-frequency, high power density applications such as wireless power transfer and plasma heating.
