A protection circuit and its control method and device

Abstract

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.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a protection circuit and a control method and device. Background technique [0002] In recent years, with the popularity of products such as mobile phones, notebook computers, camcorders, and electric vehicles, secondary batteries with charging functions have been widely used as an energy supply device. At present, the common secondary batteries on the market can be mainly divided into nickel-cadmium batteries, nickel-metal hydride batteries, and lithium-ion batteries. [0003] In practical applications, the batteries used in electronic equipment can also be called battery packs. The metal contacts on the battery pack are the positive pole of the battery pack (Pack+) and the negative pole of the battery pack (Pack-). The pack is generated by further packaging the battery cells, which are responsible for providing current. The positive pole of the battery pack (Pack+) is connected to t...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the battery pack has a certain voltage when it leaves the factory. Therefore, when the battery pack is inserted into the battery compartment of the electronic device, due to the elastic nature of the battery connector in the battery compartment, the battery voltage will be disturbed, thereby Affect the stability of devices in electronic equipment, which can easily lead to malfunction or even failure of some electronic components of electronic equipment, and then damage. easily damaged, resulting in user loss

At the same time, due to the voltage between the positive and negative electrodes of the battery pack, conduction is prone to occur, resulting in stricter requirements for battery transportation and carrying.

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