Half bridge power converter, and switching method for half bridge power converter and power switch

A switching method for a half bridge power converter comprising at least a pair of power switches in a leg of said converter providing an upper branch power switch and a lower branch power switch and comprising a first gate control circuit for said upper branch power switch and a second gate control circuit for said lower branch power switch, characterized in that said switching method comprises:

• sensing a current derivative in said upper branch and a current derivative in said lower proportional during switching of said pair of power switches to provide a first signal proportional to the current derivative of a power current in said upper power switch and a second signal proportional to the current derivative of a power current in said lower power switch,
• summing said first and second signals to provide a summed current derivative signal and;
• adding said summed current derivative signal to a power switch command signal of said first gate control circuit and a power switch command signal of said second gate control circuit causing the summed derivative signal to modulate gate commutation signals of said gate control circuits such that a current variation in both power switches is equalized by slowing down a commutation of a faster power switch of said pair of power switches while accelerating a commutation of a slower switch of said pair of power switches, in view to reduce dead time of commutation and control current overshoot in said switches.