A novel dual-channel isolated resonant gate driver to achieve gate drive loss reduction for ZVS full-bridge converters

A dual-channel resonant gate driver (RGD) is proposed in this paper. The proposed drive circuit is able to provide two isolated complemental drive signals for two power MOSFETs in a bridge leg. The inductor and the input capacitance of the MOSFET form a series resonant circuit, which enables to charge or discharge the input capacitance of the MOSFET without any electric power consumption in theoretically. The proposed RGD can be used to drive any bridge-leg structure in different isolated topologies such as full-bridge (FB) converters, three-phase inverters and multilevel converters etc. Analysis demonstrates the power loss reduction achieved by the proposed RGD. A 270 VDC input, 48 V/ 20 A output and 500 kHz phase-shift ZVS FB converter with the proposed RGD was built to verify the advantages.