Control unit (17) for controlling an inverter (3) with a DC link capacitor (6), with a plurality of output phases (20) and with a plurality of switching elements (13, 14) being arranged in half bridges (10) and being connected to the DC link capacitor (6) and the output phases (20), wherein in a failure mode the control unit is configured to control the switching elements (13, 14) to adopt an active short circuit state, in which the output phases (20) are short-circuited, wherein the control unit is configured to control the switching elements (13, 14) to be transferred from the active short circuit state into a freewheeling state, in which the switching elements (13, 14) of one half bridge are turned off, if a first condition, according to which a voltage measuring signal (26) representing a voltage dropping over the DC link capacitor (6) is indicative that the voltage between a positive potential (11) of the DC link capacitor and a negative potential (12) of the DC link capacitor (6) is below a predefined positive voltage threshold, and a second condition, according to which a current measuring signal (28) representing a current (29) flowing between an input (8) of the inverter (3) and the switching elements (13, 14) is indicative that the current (29) in a direction from the positive potential (11) to the negative potential (12) is above or equal to a predefined current threshold being below zero, are fulfilled, and to maintain and/or adopt the active short circuit state, if the first condition is fulfilled and the second condition is not fulfilled.
CONTROL UNIT, INVERTER, ASSEMBLY, VEHICLE AND METHOD FOR CONTROLLING AN INVERTER
STEUERUNGSEINHEIT, WECHSELRICHTER, ANORDNUNG, FAHRZEUG UND VERFAHREN ZUR STEUERUNG EINES WECHSELRICHTERS
UNITÉ DE COMMANDE, ONDULEUR, ENSEMBLE, VÉHICULE ET PROCÉDÉ DE COMMANDE D'UN ONDULEUR
2021-11-10
Patent
Electronic Resource
English
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern |
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