The invention discloses a protection circuit and a method and device for controlling the same, and aims to prevent
voltage disturbance from influencing functions of electronic devices when a battery is put into a battery compartment, and improve the safety performance of the battery. The
control circuit comprises a first switch, a second switch, a first
resistor and a time
delay circuit, wherein when a
battery pack enters a working state, the first switch is closed to ensure that a grid
electrode of the second switch obtains a
critical voltage of a
closed state and then enters the
closed state after the current output by a
cell passes through the time
delay circuit and after a preset
delay time; an
anode of the
cell is conducted with an
anode of the
battery pack, so that the
voltage disturbance is prevented from influencing the functions of the electronic devices when a battery is put into a battery compartment; and when the
battery pack is not in the working state, the first switch is turned off, the
voltage of the grid
electrode of the second switch is reduced to the
critical voltage when the second switch enters the
closed state, then the second switch enters a turned-off state, and the current output by the
anode of the
cell is turned off, so that the safety performance of the battery when the battery is not put into the battery compartment is improved.