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Battery charging protection circuit

A battery charging and protection circuit technology, applied in battery circuit devices, emergency protection circuit devices, circuit devices, etc., can solve the problem of inaccurate battery temperature detection and achieve the effect of effective safety protection

Inactive Publication Date: 2013-09-18
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because battery charging control chips are generally integrated chips with many functions, the detection of battery temperature is not accurate enough

Method used

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Embodiment Construction

[0010] The battery charging protection circuit in the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0011] Please refer to figure 1 and figure 2 , the battery charging protection circuit 100 in the preferred embodiment of the present invention is used to stop charging the battery 200 when the temperature of the battery 200 exceeds the battery chargeable temperature range during the charging process of the battery 200, wherein, in this embodiment In the manner, the chargeable temperature range of the battery 200 is 0°C-45°C. The battery charging protection circuit 100 includes a resistor module 10 , a voltage comparison module 20 and a battery charging control module 30 , wherein the battery charging control module 30 is connected to the battery 200 . The resistance module 10 includes a thermistor R2, the resistance of the thermistor R2 can change following the change of the battery temperature, thus causing the ...

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Abstract

The invention provides a battery charging protection circuit which is used for stopping battery charging when temperature of a battery exceeds a chargeable temperature range. The battery charging protection circuit comprises a resistance module, a voltage comparison module and a battery charging control module, wherein the resistant module comprises a thermistor; the voltage comparison module is connected with the resistance module, an upper-limit voltage value corresponding to maximum battery charging temperature and a lower-limit voltage value corresponding to minimum battery charging temperature are set in the voltage comparison module, and the voltage comparison module is used for determining whether the temperature of the battery exceeds the chargeable temperature range by comparing the voltage value of the thermistor with the upper-limit voltage value and the lower-limit voltage value and sending a control signal when the temperature of the battery exceeds the chargeable temperature range; the battery charging control module is used for stopping battery charging after the control signal is received.

Description

technical field [0001] The invention relates to a battery charging protection circuit. Background technique [0002] In order to avoid battery damage, the battery cannot be charged when the temperature is too low or too high. Generally, the chargeable temperature range of the battery is 0-45°C. In the prior art, the temperature of the battery is generally detected by a thermistor installed together with the battery. The battery charging control chip judges whether the battery temperature exceeds the chargeable temperature range by detecting the voltage value on the thermistor. , then stop charging the battery. However, because battery charging control chips are generally integrated chips with many functions, the detection of battery temperature is not accurate enough. Contents of the invention [0003] In order to solve the above problems, the present invention provides a battery charging protection circuit, which is used to stop charging the battery when the temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18
CPCH02J7/007194H02J7/04H02J7/007192
Inventor 程海龙汪涛邓雪冰
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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