Battery charging circuit with protection function and seat-type charger

A technology for battery charging and protection functions, applied in battery circuit devices, emergency protection circuit devices, current collectors, etc., can solve problems such as battery life decline and uncontrollable environment, and achieve the effect of reducing hardware costs and avoiding sharp declines.

Active Publication Date: 2013-04-10
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, due to the uncontrollable environment of the charger, when the ambient temperature is high, such as over 50 degrees Celsius, if the battery is charged, the battery life will drop sharply

Method used

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  • Battery charging circuit with protection function and seat-type charger
  • Battery charging circuit with protection function and seat-type charger

Examples

Experimental program
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Embodiment 1

[0026] Embodiment 1, the battery charging circuit of this embodiment is based on the traditional main control chip that only has charging management functions, that is, the periphery of the battery charging management chip IC001, and an analog overvoltage protection circuit and an analog overheating protection circuit are respectively designed to Realize the overvoltage and overheat protection function for lithium-ion batteries, see figure 1 shown.

[0027] The overheating protection circuit is connected to the enable pin EN of the battery charge management chip IC001, and controls the battery charge management chip IC001 to turn on or turn off the pair of The charging process of the battery realizes the overheating protection of the battery.

[0028] In this embodiment, the overheating protection circuit can be implemented by connecting a PNP transistor Q42 with an NPN transistor Q3, such as figure 1 shown. Connect the base of the PNP transistor Q42 to the battery temperat...

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PUM

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Abstract

The invention discloses a battery charging circuit with a protection function and a seat-type charger. The battery charging circuit comprises an input power source, a battery charging management chip and a battery connector, wherein an overheat protection circuit is connected to an enabled base pin of the battery charging management chip; the overheat protection circuit comprises a PNP-type triode and an NPN-type triode; a base electrode of the PNP-type triode is connected with a battery temperature detection pin of the battery connector, and is also connected with the input power source through a first divider resistor; an emitter of the PNP-type triode is connected with the input power source, and a collector of the PNP-type triode is connected with the base electrode of the NPN-type triode and is grounded through a first current-limiting resistor; and the emitter of the NPN-type triode is grounded, and the collector of the NPN-type triode is connected with the enabled base pin of the battery charging management chip and is connected with the input power source through a second current-limiting resistor. The battery charging circuit and the seat-type charger can reduce the hardware cost of a product, and are particularly suitable for common civil seat charger circuits.

Description

technical field [0001] The invention belongs to the technical field of battery charging, and in particular relates to a battery charging circuit with overvoltage and overheating protection functions and a seat charger designed using the charging circuit. Background technique [0002] Stand charger, also known as stand charger or smart charger, mainly charges lithium-ion batteries used in mobile phones, digital cameras, etc. [0003] For the current chargers, some have their own 220V mains interface, which can be directly connected to the mains, and use their built-in power adapter to convert the AC mains into a low-voltage DC power supply for the internal battery charging management chip and peripheral circuits. . And some chargers do not have a 220V mains power interface, and their power input comes from an external power adapter, such as the power adapter with a Mini USB interface commonly used on mobile phones. This kind of power adapter generally outputs a DC voltage o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02H7/18
Inventor 王海盈张芒
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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