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US 10,320,308 B2Granted
Commutating circuit
AssigneeSiemens Aktiengesellschaft
InventorsJoerg Dorn, Dominik Ergin, Peter Menke, Bernd Utz, Michael Weinhold
Life of this patent
Estimating the term…
Abstract
A commutating circuit for an electronic power converter has a first switching device, by which the electronic power converter can be electrically bridged, and a circuit part for limiting the size of the time-related voltage change of a voltage present on the first switching device. The circuit part limits the time-related voltage variation.
Claims14
A commutating circuit for a power converter, the commutating circuit comprising:
- a first switching device having a first terminal and a second terminal;
- a second switching device;
- and
- a circuit part for limiting a size of a time-related variation of a voltage which occurs across said first switching device, said circuit part having an energy store connected in parallel with said first switching device, said energy store having a first terminal connected directly to said first terminal of said first switching device and a second terminal connected directly to said second terminal of said first switching device;
- said first switching device and said circuit part together forming a parallel electric circuit;
- said second switching device being electrically connected in series with said parallel electric circuit to form an electrical series circuit disposed to bridge the power converter.
3 more elements
A power converter, comprising:
- a commutating circuit containing a switching device and a circuit part for limiting a size of a time-related variation of a voltage which occurs across said switching device, said circuit part having an energy store connected in parallel with said switching device, said energy store having a first terminal connected directly to a first terminal of said switching device and a second terminal connected directly to a second terminal of said switching device;
- said first switching device and said circuit part forming a parallel electric circuit;
- and
- a second switching device electrically connected in series with said parallel electric circuit to form an electrical series circuit disposed to bridge the power converter.
1 more element
An arrangement, comprising:
- a plurality of power converters electrically connected in series, each of said power converters containing a commutating circuit having a switching device by which a respective one of said power converters is electrically bridged and a circuit part for limiting a size of a time-related variation of a voltage which occurs across said switching device, each said circuit part having an energy store connected in parallel with said switching device, said energy store having a first terminal connected directly to a first terminal of said switching device and a second terminal connected directly to a second terminal of said switching device
- said first switching device and said circuit part forming a parallel electric circuit;
- and
- a second switching device electrically connected in series with said parallel electric circuit to form an electrical series circuit disposed to bridge the power converter.
1 more element
A method for commutation of an electric current by a first switching device of a commutating circuit in a power converter, the power converter being bridgeable by means of the first switching device and a second switching device connected in series with the first switching device, which comprises the steps of:
- flowing the electric current initially through a closed first switching device and a closed second switching device connected in series with the first switching device;
- opening the first switching device;
- and
- providing a circuit part with an energy store connected in parallel with said first switching device, the circuit part being a part of the commutating circuit and the energy store having a first terminal connected directly to a first terminal of the first switching device and a second terminal connected directly to a second terminal of the first switching device;
- commutating the electric current by the first switching device to the circuit part of the commutating circuit, using the circuit part to limit a size of a time-related variation of a voltage which occurs across the first switching device upon the opening of the first switching device, and as a result of a limitation of the time-related variation of the voltage, achieving a current zero-crossing in the first switching device;
- and
- charging the energy store with the current commutated to the circuit part and, as a result of a time-related increase in the voltage on the energy store, commutating the electric current from the circuit part to the power converter;
- and
- after commutation of the electric current to the power converter, opening the second switching device.
6 more elements
Dependencies are inferred from the claim text.