Charge and discharge protective circuit for battery

A technology for protection circuits and overvoltage protection circuits, applied in battery circuit devices, emergency protection circuit devices, circuit devices, etc., can solve problems such as susceptibility to electromagnetic interference, shortened battery life, battery hazards, etc., to avoid excessive battery consumption , avoid overcharging, stable performance

Inactive Publication Date: 2016-02-03
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the use of the battery, overcharging the battery or excessive use of the battery by the load circuit causes the battery to undervoltage, which will cause harm to the battery and shorten the service life of the battery.
[0003] In the prior art, the charge and discharge protection chip or the simulated charge and discharge protection circuit is used...

Method used

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  • Charge and discharge protective circuit for battery
  • Charge and discharge protective circuit for battery

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Embodiment Construction

[0018] The specific implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 As shown, it is a circuit frame diagram of the battery charging and discharging protection circuit proposed in the embodiment of the present application, including a battery 11, a charging circuit 12, a load circuit 13, an overvoltage protection circuit and an undervoltage protection circuit.

[0020] Wherein, the overvoltage protection circuit includes an overvoltage reference voltage circuit 141, a first comparison circuit 142, a NAND gate U1 and a first switching transistor Q1; the voltage output terminal of the overvoltage reference voltage circuit 141 is connected to the second Input terminal, the first input terminal of the first comparison circuit 142 is connected to the positive pole of the battery 11; the output terminal of the first comparison circuit 142 is connected to the first inpu...

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PUM

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Abstract

The invention discloses a charge and discharge protective circuit for a battery. The charge and discharge protective circuit comprises a battery, a charge circuit, a load circuit, an overvoltage protective circuit and an under-voltage protective circuit. The overvoltage protective circuit comprises an overvoltage reference voltage circuit, a first comparison circuit, an NAND gate and a first switch tube. The under-voltage protective circuit comprises an under-voltage reference voltage circuit, a second comparison circuit, an AND gate and a second switch tube. If the battery is overcharged, the voltage of the positive electrode of the battery is higher than the rated voltage of the battery, so the first comparison circuit outputs high level and the NAND gate outputs low level to cut off the first switch tube, the charge circuit stops charging the battery, and then the battery is prevented from being overly charged. If the load circuit excessively consumes electric energy of the battery, the voltage of the positive electrode of the battery is lower than the lowest under-voltage, so the second comparison circuit outputs low level and the AND gate outputs low level to cut off the second switch tube, the load circuit stops consuming the battery, and then an overvoltage and under-voltage effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of circuit design, and in particular relates to a battery charging and discharging protection circuit. Background technique [0002] In the use of the battery, overcharging the battery or excessive use of the battery by the load circuit causes the battery to undervoltage, which will cause harm to the battery and shorten the service life of the battery. [0003] In the prior art, the charge and discharge protection chip or the simulated charge and discharge protection circuit is used to protect the charging and discharging process of the battery, but the price of the charge and discharge protection chip is relatively high, which will increase the manufacturing cost of the product; and the simulated charge and discharge protection circuit The response speed is slow, susceptible to electromagnetic interference, and has low protection performance for the battery. Contents of the invention [0004] The applica...

Claims

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Application Information

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IPC IPC(8): H02H7/18H02J7/00
Inventor 董坤
Owner QINGDAO GOERTEK
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