The invention relates to a circuit. The circuit comprises a switch module, a control module and a driving module, wherein the driving module is electrically coupled between the switch module and the control module and comprises a normal driving unit and a fault protection unit, and the normal driving unit is used for driving the switch module to be turned on or turned off according to a first command signal provided by the control module. According to the circuit, when the control module receives a fault signal, the fault protection unit is used for reducing the value of the driving signal to a protection value from a driving value according to a second command signal provided by the control module in the fault protection time. According to the circuit, the switch module can be turned off safely when a fault occurs.