Negative voltage detection circuit and battery protection circuit

A negative pressure detection and circuit technology, applied in emergency protection circuit devices, only measuring voltage, measuring electrical variables, etc., can solve the problems of complex implementation of the charging overcurrent detection circuit 116, and achieve the effect of simple circuit implementation.
CN110108918AActive Publication Date: 2019-08-09NANJING ZGMICRO CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING ZGMICRO CO LTD
Publication Date
2019-08-09

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Abstract

The invention discloses a negative voltage detection circuit and a battery protection circuit. The negative voltage detection circuit comprises a first capacitor connected between a first node and a grounding end, a second capacitor connected between a second node and the grounding end, a detection voltage end for receiving detection voltage, a reference voltage end for receiving reference voltagewhich is positive voltage, a first switch connected between the detection voltage end and the first node, a second switch connected between the reference voltage end and the second node, a third switch connected between the first node and the third node, a fourth switch connected between the second node and the third node, and a comparator comprising a first input end connected with the third node, a second input end connected with the grounding end and an output end for outputting a comparison result. Compared with the prior art, the negative voltage detection circuit of the invention can realize negative voltage comparison, and the circuit is simple to realize.
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Description

[0001] 【Technical field】

[0002] The invention relates to the field of circuit design, in particular to a negative pressure detection circuit and a battery protection circuit.

[0003] 【Background technique】

[0004] The battery protection circuit is usually installed in the battery. For example, there is a small Printed Circuit Board (PCB for short) inside the cell phone battery, and the battery protection circuit is installed on the printed circuit board. The battery protection circuit is used to control the charging and discharging of the battery, and its basic functions include overvoltage charging protection, overvoltage discharging protection, discharging overcurrent protection, charging overcurrent protection and short circuit protection.

[0005] Please refer to figure 1 As shown, it is a schematic circuit diagram of a battery protection circuit in the prior art. The battery protection circuit includes a battery protection chip (or battery protection unit) 110, a swi...

Claims

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