INVERTER CIRCUIT FOR AN ELECTRICAL AC MOTOR, ELECTRICAL DRIVE AND METHOD FOR CONTROLLING AN ELECTRICAL DRIVE

The present disclosure relates to an inverter circuit (10) for an electrical AC motor (32) comprising a primary energy storage device (10), a plurality of switching stages (14), a drive control circuit (16) and an emergency control circuit (18). The emergency control circuit (18) is configured to switch on all of first or second semiconductor switches (24, 26) connected between a first or second terminal of the primary energy storage device (10), respectively and one phase line (28) of the electrical AC motor (32) in case of an abnormal condition of the drive control circuit (16). The emergency control circuit (18) is configured to provide a short-term control voltage VGSelevated to control gates (48) of the first semiconductor switches (24) or the second semiconductor switches (26) that exceeds a regular switch-on voltage VGSon provided to the control gates (48) by the drive control circuit (16) during normal operation of the inverter circuit (10). [0002] The disclosure further relates to an electrical drive (30) comprising an inverter circuit (10) as well as a method for controlling an electrical drive (30).