Control unit for controlling an inverter, inverter and method for operating an inverter

Control unit (4) for controlling an inverter (1) with a plurality of half bridges (11a-c) each having a first switching element (12a-c) connected to a potential (13) of a DC link (3) and a second switching element (14a-c) connected to another potential (15) of the DC link (3), wherein the control unit (4) is configured to provide first signals (41) to the first switching elements (12a-c) such that they are turned off upon receiving a request signal (38), to provide second signals (45a-c) to the second switching elements (14a-c) such that they are turned on upon receiving the request signal (38) and to perform a comparison of a measured electric parameter of the inverter (1) with a predefined threshold value, characterized in that the control unit (4) is configured to provide a second signal (45a) such that the second switching element (14a) controlled by the second signal (45a) is turned off and a second signal (45b, c) to another second switching element (14b, c) such that the second switching element (14b, c) is turned on, if a switching criterion comprising a condition that the comparison results in that the measured electric parameter reaches or crosses the threshold value is fulfilled.

Method for operating an inverter (1) with a plurality of half bridges (11a-c) each having a first switching element (12a-c) connected to a potential (13) of a DC link (3) and a second switching element (14a-c) connected to another potential (15) of the DC link (3), wherein first signals (41) are provided to the first switching elements (12a-c) such that they are turned off upon receiving a request signal (38), second signals (45a-c) are provided to the second switching elements (14a-c) such that they are turned on upon receiving the request signal (38) and a comparison of a measured electric parameter of the inverter (1) with a predefined threshold value is performed, wherein a second signal (45a) is provided such that the second switching element (14a) controlled by the second signal (45a) is turned off for a predefined time span, if a switching criterion comprising a condition that the comparison results in that the measured electric parameter reaches or crosses the threshold value is fulfilled.

Method for operating an inverter (1) with a plurality of half bridges (11a-c) each having a first switching element (12a-c) connected to a potential (13) of a DC link (3) and a second switching element (14a-c) connected to another potential (15) of the DC link (3), wherein first signals (41) are provided to the first switching elements (12a-c) such that they are turned off upon receiving a request signal (38), second signals (45a-c) are provided to the second switching elements (14a-c) such that they are turned on upon receiving the request signal (38) and a comparison of a measured electric parameter of the inverter (1) with a predefined threshold value is performed, wherein a second signal (45a) is provided such that the second switching element (14a) controlled by the second signal (45a) is turned off and a second signal (45b, c) to another second switching element (14b, c) is provided such that the second switching element (14b, c) is turned on, if a switching criterion comprising a condition that the comparison results in that the measured electric parameter reaches or crosses the threshold value is fulfilled.