Soft-transition commutation circuit of the three-phase voltage inverter switching units
A new soft-transition control scheme is proposed for high-power three-phase PWM inverter applications. Soft-switching inverters significantly reduce the amount of switching loss in power semiconductor transistors. In the each phase leg the inverter circuit achieves zero-voltage turn-on and zero-current turn-off for the main switches. By the use of commutation capacitors and inductor, we can achieve also soft-switching through the addition the auxiliary transistors.