A push-pull voltage source inverter with lossless snubber circuits

Abstract

This paper proposes a push-pull voltage source inverter with lossless snubbers. The output voltage waveform of the inverter can be modulated as either square wave or SPWM. The energy stored in the leakage inductor of the transformer can be fed back to the DC supply through the snubber circuits when main switching devices change their states. Some higher harmonics might be added to the output voltage if the snubbers are not designed properly. The operational principles and experimental results on a prototype are presented.