A lithium battery protection circuit
A technology for protecting circuits and lithium batteries, applied to emergency protection circuit devices, electrical components, etc., can solve the problems of many peripheral components and high cost, and achieve the effect of improving integration and reducing costs
Active Publication Date: 2018-03-30
SHENZHEN FM ELECTRONICS GRP CO LTD
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Problems solved by technology
[0004] The embodiment of the present invention provides a lithium battery protection circuit, which aims to solve the problem of many peripheral components and high cost in the existing lithium battery protection circuit
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[0015] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0016] A structural schematic diagram of a lithium battery protection circuit of the present invention, see figure 2 , including a battery 02 and a lithium battery protection chip 01, the battery 02 is connected to the lithium battery protection chip 01, the lithium battery protection chip 01 includes a bias and reference circuit 011 and a control sub-module 012, the bias and reference circuit 011 generates a bias voltage and Reference voltage, the control sub-module 012 generates an overcharge control signal and an overdischarge control signal according to the battery voltage, bias voltage and reference voltage; the lithium battery protection chip also includes a substrate switching circuit 013, a grid control circuit 014 and a field ...
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The invention discloses a lithium battery protective circuit. The lithium battery protective circuit comprises a battery and a lithium battery protective chip, wherein the battery is connected with the lithium battery protective chip; the lithium battery protective chip comprises a bias and reference circuit, a control sub-module, a substrate commutation circuit, a grid control circuit and a field-effect tube, wherein a bias voltage and a reference voltage are generated by the bias and reference circuit, an overcharge control signal and an overdischarge control signal are generated by the control sub-module according to the voltage of the battery, the bias voltage and the reference voltage, a substrate commutation signal is generated by the substrate commutation circuit according to the overcharge control signal or the overdischarge control signal, a grid control signal is generated by the grid control circuit according to the overcharge control signal and the overdischarge control signal, and the opening or the closing of a charge and discharge loop of the lithium battery is controlled by the field-effect tube according to the substrate commutation signal and the grid control signal. Through the use of the lithium battery protective circuit disclosed by the invention, the integration degree of the lithium battery protective chip is improved, and the cost of the lithium battery protective circuit is reduced.
Description
technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a lithium battery protection circuit. Background technique [0002] Existing lithium battery protection circuits such as figure 1 As shown, the lithium battery protection chip contains two parts: the control module and the detection module. The detection module compares the lithium battery voltage VDD with the overcharge detection voltage and overdischarge detection voltage, and compares the VM terminal voltage with the overcurrent detection voltage and short circuit detection. The voltage is compared with the charging detection voltage to obtain a comparison signal. The control module processes the comparison signal, judges the working state of the lithium battery, and cuts off the charging or discharging switch according to the actual situation to protect the lithium battery. [0003] The existing lithium battery protection chip has too many peripher...
Claims
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IPC IPC(8): H02H7/18
Inventor 林剑辉
Owner SHENZHEN FM ELECTRONICS GRP CO LTD