Cascaded battery protection circuit and system

A battery and circuit technology, applied in the field of cascaded battery protection circuits and their systems, can solve the problems of rising battery protection circuit costs and low chip integration, and achieve the effects of saving power consumption, increasing integration, and reducing costs

Active Publication Date: 2016-04-06
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, a large resistor is connected in series with the peripheral circuit of the protection chip, which increases the cost of the battery protection circuit and the integration level of the chip is not high.

Method used

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  • Cascaded battery protection circuit and system
  • Cascaded battery protection circuit and system
  • Cascaded battery protection circuit and system

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0024] figure 2 It is a schematic diagram of a cascaded battery protection chip provided by an embodiment of the present invention. As shown in the figure, the battery protection chip circuit 001 includes a charge and discharge control output subcircuit 002 and an overcharge and discharge protection input subcircuit 003 .

[0025] The charge and discharge control output sub-circuit 002 receives the internal first control signal C_CTRL of the battery protection chip circuit 001 to determine whether to pull up the level of the charge control output ...

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PUM

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Abstract

The invention provides a cascaded battery protection circuit and system. According to the circuit, an overcharge protection signal input pin SOC is directly connected with a charge control output pin OV of a superior battery protection chip to form a charge control output access; an overdischarge protection signal input pin SDC is directly connected with a discharge control output pin DCHG of the superior battery protection chip to form a discharge control output access; and a battery protection chip circuit limits the magnitude of currents in accesses according to the charge control output access and the discharge control output access. According to the circuit, the current magnitude can be limited to reduce power consumption and protect the chip from being impacted by a high current without the need for connecting a high resistor in series to two signal accesses for cascaded transmission, thereby reducing the cost of the battery protection circuit; and the battery protection chip is used to limit the current, thereby improving the integration level of the chip.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design in the field of microelectronics, in particular to a cascaded battery protection circuit and its system. Background technique [0002] In the prior art, the protection circuit of a single lithium battery is very mature, but for a multi-series lithium battery, it is difficult to form a matching protection circuit. [0003] In the case of meeting the requirements of the battery protection system, when the number of battery protection chip units that need to be connected in series in the battery protection system increases, due to the increase in the total battery voltage, it is necessary to cascade multiple battery protection chip units as the battery of the battery protection system. protect the circuit. [0004] When chips are cascaded, the charge control output and discharge control output of the upper chip are usually still used to transmit protection information to the lower ...

Claims

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Application Information

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IPC IPC(8): H02H7/18H02J7/00
CPCH02H7/18H02J7/0026
Inventor 尹航田文博王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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