A drive circuit of a power semiconductor switch, comprising: a pulse modulation circuit, provided with a first terminal, a second terminal and a third terminal, the first terminal being configured to receive a fault signal; an isolation transformer, provided with a first primary terminal, a second primary terminal, a first secondary terminal, and a second secondary terminal; the first primary terminal being coupled to the second terminal of the pulse modulation circuit, and the second primary terminal being coupled to the third terminal of the pulse modulation circuit; and a pulse demodulation circuit, provided with a first input terminal, a second input terminal, a first output terminal, and a second output terminal; the first input terminal being coupled to the first secondary terminal, the second input terminal being coupled to the second secondary terminal, the first output terminal being connectable to a gate of the power semiconductor switch, and the second output terminal being connectable to an emitter of the power semiconductor switch; wherein when there is no fault signal being received at the first terminal of the pulse modulation circuit, the pulse modulation circuit outputs at least one first turn on pulse signal and at least one first turn off pulse signal to the isolation transformer based on a pulse width modulation signal, and transmits the at least one first turn on pulse signal and the at least one first turn off pulse signal to the pulse demodulation circuit via the isolation transformer, the at least one first turn on pulse signal and the at least one first turn off pulse signal are, via the demodulation circuit, used for charging-discharging of a gate capacitor of the power semiconductor switch, driving the power semiconductor switch to be turned on, and turned off at a first speed; and when the fault signal is received at the first terminal of the pulse modulation circuit, the pulse modulation circuit outputs at least one second turn off pulse signal to the isolation transformer based on the fault signal, and transmits the at least one second turn off pulse signal to the pulse demodulation circuit via the isolation transformer, the at least one second turn off pulse signal is, via the demodulation circuit, used for discharging of the gate capacitor of the power semiconductor switch, driving the power semiconductor switch to be turned off at a second speed; characterized in that, a voltage amplitude of a preset pulse width in the second turn off pulse signal is smaller than a voltage amplitude of the first turn off pulse signal, and a pulse width of the second turn off pulse signal is equal to a pulse width of the first turn off pulse signal, causing the second speed to be smaller than the first speed. a pulse modulation circuit, provided with a first terminal, a second terminal and a third terminal, the first terminal being configured to receive a fault signal; an isolation transformer, provided with a first primary terminal, a second primary terminal, a first secondary terminal, and a second secondary terminal; the first primary terminal being coupled to the second terminal of the pulse modulation circuit, and the second primary terminal being coupled to the third terminal of the pulse modulation circuit; and a pulse demodulation circuit, provided with a first input terminal, a second input terminal, a first output terminal, and a second output terminal; the first input terminal being coupled to the first secondary terminal, the second input terminal being coupled to the second secondary terminal, the first output terminal being connectable to a gate of the power semiconductor switch, and the second output terminal being connectable to an emitter of the power semiconductor switch; wherein when there is no fault signal being received at the first terminal of the pulse modulation circuit, the pulse modulation circuit outputs at least one first turn on pulse signal and at least one first turn off pulse signal to the isolation transformer based on a pulse width modulation signal, and transmits the at least one first turn on pulse signal and the at least one first turn off pulse signal to the pulse demodulation circuit via the isolation transformer, the at least one first turn on pulse signal and the at least one first turn off pulse signal are, via the demodulation circuit, used for charging-discharging of a gate capacitor of the power semiconductor switch, driving the power semiconductor switch to be turned on, and turned off at a first speed; and when the fault signal is received at the first terminal of the pulse modulation circuit, the pulse modulation circuit outputs at least one second turn off pulse signal to the isolation transformer based on the fault signal, and transmits the at least one second turn off pulse signal to the pulse demodulation circuit via the isolation transformer, the at least one second turn off pulse signal is, via the demodulation circuit, used for discharging of the gate capacitor of the power semiconductor switch, driving the power semiconductor switch to be turned off at a second speed; characterized in that, a voltage amplitude of a preset pulse width in the second turn off pulse signal is smaller than a voltage amplitude of the first turn off pulse signal, and a pulse width of the second turn off pulse signal is equal to a pulse width of the first turn off pulse signal, causing the second speed to be smaller than the first speed.