Discharge Device For DC Bus Capacitor

Various embodiments of the teachings herein include a discharge device for a DC bus capacitor. An example device includes: a resistor connected in series with a DC bus capacitor of a converter; a braking IGBT connected between a positive electrode and a negative electrode of the DC bus capacitor; a switch connected to the braking IGBT and the resistor; and a control unit to turn on the braking IGBT in response to a power supply system of the converter being powered off, and control a state of the switch to discharge the DC bus capacitor, using the resistor and the braking IGBT.