A circuit for actively performing short-circuit , comprising: an undervoltage detecting circuit , wherein the undervoltage detecting circuit is connectable to an external driving power supply, and is configured to detect a driving power supply signal outputted from the external driving power supply and output, in a case that an amplitude of the driving power supply signal is lower than a first threshold, an emergency active short-circuit enable signal; and an emergency power supply connected to the undervoltage detecting circuit , wherein, the circuit for actively performing short-circuit further comprises an gate level selecting switch and a reverse-flow preventing circuit , wherein the reverse-flow preventing circuit is arranged between the external driving power supply and the emergency power supply , and is configured to insulate the driving power supply signal from the emergency power supply signal in a case that the emergency power supply is enabled, and the gate level selecting switch is connected to the undervoltage detecting circuit , wherein in response to the emergency active short-circuit enable signal, the emergency power supply is enabled and the gate level selecting switch is controlled to switch from a first conduction path to a second conduction path, to transmit an emergency power supply signal outputted from the emergency power supply to a bridge arm via the second conduction path, and wherein the first conduction path is a path between the bridge arm and an external bridge arm driving circuit, and the second conduction path is a path between the bridge arm and the emergency power supply . an undervoltage detecting circuit , wherein the undervoltage detecting circuit is connectable to an external driving power supply, and is configured to detect a driving power supply signal outputted from the external driving power supply and output, in a case that an amplitude of the driving power supply signal is lower than a first threshold, an emergency active short-circuit enable signal; and an emergency power supply connected to the undervoltage detecting circuit , wherein, the circuit for actively performing short-circuit further comprises an gate level selecting switch and a reverse-flow preventing circuit , wherein the reverse-flow preventing circuit is arranged between the external driving power supply and the emergency power supply , and is configured to insulate the driving power supply signal from the emergency power supply signal in a case that the emergency power supply is enabled, and the gate level selecting switch is connected to the undervoltage detecting circuit , wherein in response to the emergency active short-circuit enable signal, the emergency power supply is enabled and the gate level selecting switch is controlled to switch from a first conduction path to a second conduction path, to transmit an emergency power supply signal outputted from the emergency power supply to a bridge arm via the second conduction path, and wherein the first conduction path is a path between the bridge arm and an external bridge arm driving circuit, and the second conduction path is a path between the bridge arm and the emergency power supply . <EOS>