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Zero-voltage switching for the neutral-point-clamped (NPC) inverter

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2 Author(s)
Xiaoming Yuan ; GE Global Res.-Shanghai, Shanghai, China ; I. Barbi

This paper proposes a transformer-assisted pulsewidth-modulation zero-voltage-switching neutral-point-clamped (NPC) inverter. With the assistance of a transformer-assisted small-rating lossless auxiliary circuit, the main switches work with zero-voltage switching without suffering from any voltage/current spikes, under simple explicit control. The technique allows for higher operating frequency and better device utilization of the NPC inverter. Operation, analysis, design, as well as testing results from a 7-kW prototype are presented in detail.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:49 ,  Issue: 4 )