A control module of a power calibration circuit comprises a control unit, a main voltage feedback unit and an auxiliary voltage feedback unit, the control unit is connected to at least one power switch, the main voltage feedback unit is connected to an output terminal of the power calibration circuit and the control unit, the auxiliary voltage feedback unit is connected to the output terminal and the control unit, the auxiliary voltage feedback unit comprises a voltage dividing circuit connected to the output terminal and having at least one voltage dividing node, and a voltage limiting circuit connected to the voltage dividing node and the control unit, the voltage limiting circuit has a first state when a voltage of the voltage dividing node is not higher than a reference voltage, and a second state when a voltage of the voltage dividing node is higher than the reference voltage.