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Highly integrated battery protection circuit

An integrated battery and protection circuit technology, which is applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, and protection for overcurrent responses, can solve problems such as total cost reduction, Achieve the effects of reduced program area, high integration, and cost reduction

Inactive Publication Date: 2009-07-15
SAIXIN MICROELECTRONICS SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the program area of ​​this scheme is reduced, the total cost is not necessarily reduced.

Method used

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Examples

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Embodiment Construction

[0061] Figure 4 is a simplified block diagram of an embodiment of the present invention.

[0062] In this embodiment, the main switch tube gate control circuit 101 implements detection of abnormal states such as overcharge, overdischarge, and overcurrent of the battery to issue the control of turning off or turning on the main switch tube 103 . Correct biasing of the substrate of the main switching transistor 103 is realized by the substrate control circuit 102 .

[0063] Figure 4 The battery in the battery is usually a secondary battery such as lithium ion. The positive electrode is connected to the positive voltage terminal, that is, the terminal T1 of the highly integrated battery protection circuit 100 , and the negative electrode is connected to the negative voltage terminal T4 through the main switch tube 103 . The fluctuation countermeasure circuit absorbs the fluctuation of battery voltage. In addition, the positive electrode of the load or charger is connected to...

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Abstract

The present invention relates to a battery protection circuit particularly relates to high integration density battery protection circuit with a switch protection tube that can automatically break the connection between a battery and a charger when over-charge, over-discharge, over-current. The invention comprises a master switch tube, a master switch tube grid control circuit, a master switch tube substrate control circuit, an alteration countermeasure circuit, a status initialization circuit and a section converting circuit and all are integrated on one same semi-conductor substrate. The battery protection scheme provided in the invention can not only decrease scheme area greatly, chip cost is reduced and packaging cost is lowered as well as printed circuit board cost without yield cost, and real low cost and high integration density is realized.

Description

technical field [0001] The invention relates to a battery protection circuit, in particular to a highly integrated battery protection circuit with a protection switch tube that automatically cuts off the connection between the battery and the charger during overcharging, overdischarging and overcurrent. Background technique [0002] Secondary batteries such as lithium batteries deteriorate rapidly due to abnormal conditions such as overcharge, overdischarge, and overcurrent, which affects battery life. The damage to the battery under these abnormal conditions is usually protected by a battery protection device. [0003] Current battery protection devices such as figure 1 As shown in the embodiment, it is mainly implemented by means of a traditional battery protection control chip 092 and externally connecting a discharge switch 093 and a charge switch 094 . This device requires 1 battery protection controller 092, 2 switch tubes 095 (in order to reduce internal resistance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18H02H3/08H02H9/00
Inventor 谭健刘继山
Owner SAIXIN MICROELECTRONICS SUZHOU
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