CONVERTER SUBMODULE WITH SHORT-CIRCUIT DEVICE AND POWER CONVERTER HAVING SAME
First Claim
1. A submodule for a power converter, comprising:
- a bridge circuit comprising at least one power semiconductor branch which extends between a first and a second DC voltage node and having a controllable power semiconductor switch arranged therein, with a freewheeling diode connected in anti-parallel thereto;
a capacitor connected in parallel to the bridge circuit between the first and second DC voltage nodes; and
a short circuit device comprising at least one selected of the freewheeling diodes anti-parallel to the power semiconductor switches of the bridge circuit, wherein the at least one selected freewheeling diode is manufactured in press pack design and rated such that, when a fault occurs in the submodule, the at least one selected freewheeling diode breaks down due to fault conditions and provides a low-impedance short-circuit path between a first and a second AC voltage connection of the submodule.
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Accused Products
Abstract
A short-circuit device and a protection method for a submodule for a power converter are disclosed. The submodule includes a bridge circuit having at least one power semiconductor branch extending between a first and a second DC voltage node and at least one controllable power semiconductor switch disposed therein to which a freewheeling diode is connected in anti-parallel, and a capacitor connected in parallel to the bridge circuit. The short-circuit device has at least one selected of the freewheeling diodes anti-parallel to the power semiconductor switches of the bridge circuit, wherein the at least one selected freewheeling diode is manufactured in press pack design and rated such that, when a fault occurs in the submodule, the at least one selected freewheeling diode breaks down due to the fault conditions and provides a durable, stable, low-impedance short circuit path between a first and a second AC voltage connection of the submodule.
18 Citations
18 Claims
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1. A submodule for a power converter, comprising:
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a bridge circuit comprising at least one power semiconductor branch which extends between a first and a second DC voltage node and having a controllable power semiconductor switch arranged therein, with a freewheeling diode connected in anti-parallel thereto; a capacitor connected in parallel to the bridge circuit between the first and second DC voltage nodes; and a short circuit device comprising at least one selected of the freewheeling diodes anti-parallel to the power semiconductor switches of the bridge circuit, wherein the at least one selected freewheeling diode is manufactured in press pack design and rated such that, when a fault occurs in the submodule, the at least one selected freewheeling diode breaks down due to fault conditions and provides a low-impedance short-circuit path between a first and a second AC voltage connection of the submodule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification