Driver design for 3kW 13.56 MHz multiphase resonant inverter

In half-bridge inverter topology, it is well known that the driver circuit design at high switching frequency is always the challenge due to the ground floating of the high-side driver circuit. At very high switching frequency such as 13.56 MHz, the common mode noise becomes a critical issue because it strongly effects to the stability and the efficiency of the inverter especially in case of the high power condition. Furthermore, in the case of multiphase resonant inverter topology, the synchronous of the driver pulse among phases to obtain the same class DE operation mode in every phase is also another challenge. In this paper, the driver circuit design for 3kW 13.56 MHz multiphase resonant inverter with the efficiency of 96.1% is presented in detail.