New switching sequence-based PWM pattern of three phase inverter with active auxiliary edge resonant commutation snubber

摘要

This paper proposes a new topology of the voltage source bridge inverter circuit, which has the novel active edge resonant snubber circuit using the auxiliary switches. This inverter is acceptable for an uninterruptible power supply, PFC power converter, utility-interactive bi-directional power converter and so on. In this paper, the soft switching operation principle and design procedure of the active auxiliary edge resonant snubber circuit for high power applications are described and discussed. Both the main active switches and the auxiliary switches achieve ZVS or ZCS in this sinewave PWM inverter. This soft switching PWM inverter can minimize the switching surge related electromagnetic noise and the switching power loss of power semiconductor devices used here. This inverter does not need the sensor interfaced circuit to detect the voltage or the current and does not also required for the electrolytic chemical capacitors to make the neutral point of the DC power supply voltage. Because of the power semiconductor switches have the relation of the trade-off evaluation in the switching fall time characteristic and the conductive saturation voltage characteristic, this soft switching inverter can improve efficiency under conditions of the low saturation voltage.