Battery low-voltage protection circuit and battery management circuit

Abstract

The invention is applicable to the field of power supplies and provides a battery low-voltage protection circuit and a battery management circuit; the battery low-voltage protection circuit comprises a switch circuit, a sampling circuit and a locking circuit, wherein a first input end of the locking circuit is connected to an output end of the sampling circuit, a second input end of the locking circuit is connected with a reference voltage signal, a sampled voltage signal is compared with the reference voltage signal, when the battery voltage is lower than a set threshold voltage, the lockingcircuit outputs a control signal for entering into the locking state. The battery low-voltage protection circuit samples the battery voltage signal through the sampling circuit and then further compares the sampled voltage signal outputted by the sampling circuit with the reference voltage signal by adopting the locking circuit, when the battery voltage is lower than the set threshold voltage, the control signal is outputted, thereby entering into the locking state and carrying out the battery low-voltage protection; and the circuit has the advantages of simple structure, high precision, longservice life of elements and strong anti-surge impact capacity.

Description

technical field [0001] The invention belongs to the field of power supplies, in particular to a battery low-voltage protection circuit and a battery management circuit. Background technique [0002] Prior art 1 uses a micro-control chip to realize battery low-voltage protection. The disadvantage is that after the load is cut off, the recovery of the battery voltage will enable the micro-control chip to be turned on again, so that the battery is in a cycle of protection discharge. It will lead to excessive leakage current of the battery and short storage time; in practical applications, it will have an adverse effect on the life of the battery and the load. [0003] Prior art 2 is to use the comparison and self-locking functions of the comparator to realize the low-voltage protection and lock-up of the battery through an analog circuit; the disadvantage is that a coupling capacitor is needed to help the comparator to output a high voltage when it starts, but the coupling The...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a battery low-voltage protection circuit, which aims to solve the problem of using a micro-control chip to realize battery low-voltage protection in the prior art 1, resulting in excessive battery leakage current and short storage time and the use of a comparator in the prior art 2 To realize the problem of poor anti-surge current ability due to low-voltage protection of the battery

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