Over-discharge protection circuit for lithium battery

Abstract

The invention discloses an over-discharge protection circuit for a lithium battery. The over-discharge protection circuit comprises a switch, a first triode, a second triode and a light-emitting diode (LED), wherein an emitter of the first triode and one end of the switch are respectively connected with the input end of a lithium battery power supply, the collector electrode of the first triode serves as the output end of the lithium battery power supply, the positive electrode of the LED is connected with the other end of the switch, and the negative electrode of the LED is connected with the base electrode of the second triode through a first resistor. The over-discharge protection circuit provided by the invention has the beneficial effects that the over-discharge current value of the lithium battery connected into a circuit can be effectively lowered to improve the stability of the circuit, thus the life cycle of the lithium battery is effectively prolonged, the safety and reliability of charging devices, such as batteries, are guaranteed, and the circuit cost is lowered.

Description

technical field [0001] The invention relates to a discharge protection circuit, in particular to an over-discharge protection circuit for lithium batteries. Background technique [0002] Because light-emitting diodes have forward conduction, reverse cut-off, breakdown characteristics and luminous characteristics, they have been widely used in electronic instruments and electronic equipment. As we all know, lithium batteries cannot be overcharged or overdischarged, otherwise it will lead to the failure of lithium batteries, and sometimes lead to safety problems of lithium batteries, so it is particularly important to do a good job in overdischarge protection of lithium batteries. Since lithium batteries also have self-discharge during storage, the general self-discharge current is microampere level, so the design index of over-discharge protection is to control the discharge current at the over-discharge protection voltage below a certain standard. The traditional over-discha...

AI Technical Summary

Problems solved by technology

However, limited by factors such as Zener diode discharge current and system cost, it is difficult for the over-discharge circuit to meet the protection requirements for charging devices such as batteries.

At present, there is no over-discharge protection circuit for lithium batteries, which can effectively reduce the over-discharge current value of lithium batteries connected to the circuit, so as to improve the stability of the circuit, thereby effectively improving the life cycle of lithium batteries. protect the circuit

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