Patent ID: 9590489
Date: 2017-03-07
CPC Classifications: H02M

Claim:
1. A converter comprising a plurality of sub-modules connected in series to each other, wherein: each of the sub-modules comprises: a first half-bridge unit comprising a first energy storage unit, and a plurality of first power semiconductors connected in parallel to the first energy storage unit and connected in series to each other; a second half-bridge unit comprising a second energy storage unit, and a plurality of second power semiconductors connected in parallel to the second energy storage unit and connected in series to each other; and an auxiliary circuit unit connecting the first half-bridge unit and the second half-bridge unit; wherein the auxiliary circuit unit comprises a single third power semiconductor and a single diode, wherein a collector terminal of the single third power semiconductor is directly connected to a positive terminal of the first energy storage unit and an emitter terminal of the single third power semiconductor is directly connected to a negative terminal of the second energy storage unit, and wherein an anode terminal of the single diode is directly connected to a negative terminal of the first energy storage unit and a cathode terminal of the single diode is directly connected to a positive terminal of the second energy storage unit.