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As the switching frequency increases, to reduce the gate drive loss combined with the Zero-Voltage-Switching (ZVS) technique is meaningful for the widely used Full-Bridge (FB) converters. A dual-channel isolated Resonant Gate Driver (RGD) is proposed in this paper. The proposed RGD is able to provide two isolated complementary drive signals for two power MOSFETs in one bridge leg. Furthermore, the proposed RGD reduces about 79% gate drive loss compared to the conventional Voltage Source Driver (VSD). In addition, the negative gate drive voltage provided by the proposed RGD prevents the false trigger problem. The optimum design of the proposed RGD is given in detail. A 200-VDC input, 48-V/20-A output and 500-kHz phase-shift ZVS FB converter with the proposed RGD was built to verify the advantage and efficiency improvement.
Date of Conference: 17-21 March 2013