High Efficiency Resonant Power Converters and Resonant Gate Drivers

摘要

A device to drive a plurality of power switches in a power converter with an input voltage port having an input voltage comprises a drive resonant tank, a switch network, a control block configured to control the turn-on and turn-off of drive switches, and an output port. The drive resonant tank comprises a resonant inductor, and a resonant capacitor which comprises an input capacitance of a power switch. The switch network has a plurality of drive switches, which are controlled such that the drive resonant tank goes through a resonant state and a pseudo clamp state consecutively during a switching period. A gate drive voltage of a power switch fluctuates slightly during the pseudo clamp state. The output port has two terminals coupled to a gate and a source of a power switch respectively.