Inverter circuit with the regenerative passive snubber

This paper presents an inverter circuit using a snubber circuit to achieve soft switching. This snubber circuit has a transformer-based energy regenerative circuit. This circuit has no additional switching device, and the cost is low. In this paper, this circuit was examined and evaluated by single shot test and PWM drive test. By single shot test, turn-on and turn-off waveforms were measured and we verified that the loss of the switching devices was decreased. Moreover by PWM drive test, the temperature under switching devices with snubber was lower than that of snubberless main circuit. Calculating the loss from the temperature, we verified that the total loss of the switching devices decreased to 72%. This decrease of the switching loss will make it possible to raise switching frequency. Therefore, we can reduce the weight of the filter reactor