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.


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    Title :

    CONTROL UNIT, INVERTER, ASSEMBLY, VEHICLE AND METHOD FOR CONTROLLING AN INVERTER


    Additional title:

    STEUERUNGSEINHEIT, WECHSELRICHTER, ANORDNUNG, FAHRZEUG UND VERFAHREN ZUR STEUERUNG EINES WECHSELRICHTERS
    UNITÉ DE COMMANDE, ONDULEUR, ENSEMBLE, VÉHICULE ET PROCÉDÉ DE COMMANDE D'UN ONDULEUR


    Contributors:

    Publication date :

    2019-06-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    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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