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.

Active Publication Date: 2019-08-09
NANJING ZGMICRO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the charging overcurrent protection threshold, the current charging overcurrent detection circuit 116 is relatively complicated to implement

Method used

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  • Negative voltage detection circuit and battery protection circuit
  • Negative voltage detection circuit and battery protection circuit

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Embodiment Construction

[0025] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] The term "one embodiment" or "embodiment" here refers to that specific features, structures or characteristics related to the embodiment can be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification do not necessarily all refer to the same embodiment, nor do they necessarily refer to a separate or selected embodiment that is mutually exclusive of other embodiments. "Multiple" and "several" in the present invention mean two or more. "And / or" in the present invention means "and" or "or".

[0027] The invention proposes a negative pressure detection circuit, which can realize negative pressure detection with a simple circuit.

[0028] ...

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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.

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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Application Information

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IPC IPC(8): G01R19/00H02H7/18
CPCG01R19/0084H02H7/18
Inventor 常星王钊
Owner NANJING ZGMICRO CO LTD
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