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US 12,149,118 B2Granted
Control arrangement, backup system and method for controlling an inverter
AssigneeFronius International GmbH
InventorsHans-Peter Pimminger, Martin Heidl, Florian Guschlbauer
Life of this patent
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Abstract
A secure, reliable and simplified control mechanism for operating an inverter is provided. In particular, a mechanical switch is used for connecting a local grid with a public grid and for disconnecting the local grid from the public grid. The mechanical switch comprises an intermediate position. Each time when the switch is in this intermediate position, the inverter is immediately shut down in a fast shutdown operation.
Claims13
A control arrangement for an inverter, comprising:
- a switch with at least three switching positions comprising a first position, a second position and an intermediate position;
- and
- a control device for controlling an operation of the inverter,
- wherein the switch is set to the intermediate position during each change between the first position and the second position, and
- wherein the control device is configured to shut down the inverter as soon as the switch is set to the intermediate position, operate the inverter in an on-grid mode when the switch is set to the first position, and operate the inverter in an off-grid mode when the switch is set to the second position,
- wherein the switch comprises a first auxiliary switching element which is configured to interrupt a connection between the switch and the control device when the switch is in the intermediate position, and to close the connection between the switch and the control device when the switch is in the first position or the second position, and
- wherein the control device is configured to immediately shut down the inverter as soon as the connection is interrupted.
4 more elements
A method for controlling an inverter, comprising:
- detecting an intermediate position of a switch with three switching positions including a first position, a second position and an intermediate position;
- shutting down the inverter upon detecting that the switch is set to the intermediate position;
- operating the inverter in an on-grid mode when the switch is set to the first position;
- and
- operating the inverter in an off-grid mode when the switch is set to the second position,
- wherein the switch comprises a first auxiliary switching element which interrupts a connection between the switch and the control device when the switch is in the intermediate position, and closes the connection between the switch and the control device when the switch is in the first position or the second position, and wherein the control device immediately shuts down the inverter as soon as the connection is interrupted.
3 more elements
Dependencies are inferred from the claim text.