THREE-LEVEL ACTIVE NEUTRAL POINT CONVERTER
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Abstract
The invention relates to a active-neutral point clamped converter having at least one half-bridge circuit connected into a DC voltage circuit. Each half-bridge circuit has a high-potential-side input half-bridge and a low-potential-side input half-bridge in series. The half-bridge circuit further has an output half-bridge connected between center taps of the input half-bridges. The total inductance within the output half-bridges and between the three half-bridges is dimensioned such that if any of the power semiconductors of the half-bridge circuit fails, a short-circuit can be reliably disconnected via a shorted circuit formed between the three half-bridges of the half-bridge circuit by the intact power semiconductors in said shorted circuit.
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Citations
7 Claims
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1-6. -6. (canceled)
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7. A three-level converter, comprising:
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an input-side DC circuit having a high-potential rail and a low-potential rail; at least one half-bridge circuit, the half-bridge circuit having a high-potential side input half-bridge, a low-potential side input half-bridge and an output half-bridge, wherein the two input half-bridges are connected in series between the high-potential rail and the low-potential rail of the input-side DC circuit, and the output half-bridge is connected between a center tap of the high-potential side input half-bridge and a center tap of the low-potential side input half-bridge, and a phase terminal connected to a center tap of the output half-bridge, said phase terminal being adapted to be connected to a load circuit, wherein the total of the inductance within the output half-bridge connected between the high-potential side input half-bridge and the low-potential side input half-bridge, and the inductance between the high-potential side input half-bridge and the output half-bridge, and the inductance between the low-potential side input half-bridge and the output half-bridge is designed to have a value such that, in the event of a failure of any one power semiconductor in the half-bridge circuit, a short-circuit via a short-circuit path formed between the three half-bridges of the half-bridge circuit can be reliably cut off by the intact power semiconductors in that short-circuit path.
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Specification