Invention Grant
- Patent Title: Method for current limitation in the event of transient voltage variations at an AC output of a multi-level inverter and a multi-level inverter
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Application No.: US17411374Application Date: 2021-08-25
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Publication No.: US11621650B2Publication Date: 2023-04-04
- Inventor: Uwe Stickelmann , Roland Zuelch
- Applicant: SMA Solar Technology AG
- Applicant Address: DE Niestetal
- Assignee: SMA Solar Technology AG
- Current Assignee: SMA Solar Technology AG
- Current Assignee Address: DE Niestetal
- Agency: Eschweiler & Potashnik, LLC
- Priority: DE102019105196.7 20190228
- Main IPC: H02M7/483
- IPC: H02M7/483 ; H02M1/32 ; H02M7/487 ; H02M7/5387

Abstract:
A method provides current limitation in the event of transient voltage variations at an AC output of a multilevel inverter that includes a bridge circuit with a first DC input, a second DC input, a neutral terminal and a bridge output, as well as a line filter with a choke connected between the bridge output and the AC output, and a capacitor connected between the AC output and the neutral terminal. In the method, depending on the voltage at the capacitor, when a first current threshold is exceeded by the choke current, a regular operating mode is interrupted and measures for current limitation are initiated. A multilevel inverter is further disclosed including a control circuit that is configured to carry out such a method.
Public/Granted literature
Information query
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