DIODE NEUTRAL POINT CLAMPED THREE-LEVEL INVERTER CURRENT LIMITING CONTROL METHOD AND RELATED CIRCUIT THEREOF

摘要

This application discloses a current limiting control method for a diode neutral-point-clamped three-level inverter and a related circuit. Specifically, when a current in switching tubes is lowered to a value not greater than a first preset current value, the current limiting control method for a diode neutral-point-clamped three-level inverter and the related circuit drive a switching tube of the switching tubes inside the bridge arm to be turned on; after a first delay time, drive another switching tube of the inside switching tubes to be turned on; after a second delay time, control a switching tube of the inside switching tubes to be turned off and another switching tube to be normally turned on; and control all the switching tubes to be turned on or off according to a control time sequence of the diode neutral-point-clamped three-level inverter circuit. In this control manner, a turn-on/off order of the switching tubes in the diode neutral-point-clamped three-level inverter circuit is controlled, voltage stress of the switching tubes is reduced, and it is ensured that the voltage stress of the switching tubes does not exceed a limit when a current-limiting state is exited.