Abstract
This paper analyses the utilization of an energy regeneration circuit in a three-level NPC (Neutral-Point Clamped) voltage-fed inverter using a modified Undeland snubber. The regeneration circuit uses a QSC (Quasi-Square wave Converter) ZVS (Zero Voltage Switching) dc-dc auxiliary converter to restore the energy from the snubber capacitor to the dc bus. The regenerative circuit uses a single active switch and operates independently of the inverter. Operation stages, theoretical waveforms and a design methodology are presented. Experimental results of a 1.5 kVA prototype are included to validate the proposed topology.
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