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Current compensation circuit of lithium protection chip

A technology of current compensation circuit and protection chip, which is applied in the direction of emergency protection circuit device, charge equalization circuit, battery circuit device, etc., which can solve the problems of battery unit power loss, achieve the effect of perfecting functions and solving battery power loss

Active Publication Date: 2019-12-24
成都芯港微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a current compensation circuit for a lithium battery protection chip, which can solve the problem of power loss caused by the battery unit in the prior art when the chip is sampled and detected

Method used

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  • Current compensation circuit of lithium protection chip
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Embodiment 1

[0027] The present invention designs a current compensation circuit for a lithium battery protection chip, which can solve the problem of power loss caused by the battery unit in the prior art when the chip is sampled and detected, such as figure 1 , figure 2As shown, the following configuration structure is adopted in particular: applied to the battery pack, connected to the battery unit VCC of the battery pack, including the first sampling circuit, the second sampling circuit and the current mirror module IC3, the first sampling circuit and the battery unit VCC The first sampling circuit is connected with the second sampling circuit, the second sampling circuit is connected with the current mirror module IC3, and the current mirror module IC3 is connected with the first sampling circuit; the first sampling circuit sends the sampled voltage to the second In the second sampling circuit, the second sampling circuit uses the current mirror module IC3 to output current to the fi...

Embodiment 2

[0029] This embodiment is further optimized on the basis of the foregoing embodiments, and the same parts as the foregoing technical solutions will not be repeated here, such as figure 1 , figure 2 As shown, further in order to better realize the present invention, the following setting method is particularly adopted: the first sampling circuit is provided with a first resistor R1, a MOS transistor Q1, an operational amplifier circuit IC1 and a second resistor R2, and the operational amplifier circuit IC1 The non-inverting input terminal is connected to the negative pole of the battery unit VCC, the inverting input terminal of the operational amplifier circuit IC1 is connected to the positive pole of the battery unit VCC through the resistor R1, and the port 1 of the operational amplifier circuit IC1 is connected to the current mirror module IC3. The output end of the circuit IC1 is connected to the gate of the MOS transistor Q1, the source end of the MOS transistor Q1 is con...

Embodiment 3

[0032] This embodiment is further optimized on the basis of any of the above-mentioned embodiments, and the same parts as the aforementioned technical solutions will not be repeated here, such as figure 1 , figure 2 As shown, further in order to better realize the present invention, the following setting method is adopted in particular: the second sampling circuit includes an operational amplifier circuit IC2, a resistor R3, a MOS transistor Q2 and a resistor R4, and the non-inverting input terminal of the operational amplifier circuit IC2 The drain terminal of MOS transistor Q1 is connected through resistor R2, the resistor R3 is connected to the non-inverting input terminal of operational amplifier circuit IC2, the output terminal of operational amplifier circuit IC2 is connected to the gate of MOS transistor Q2, and the drain terminal of MOS transistor Q2 is connected to the current The mirror module IC3 is connected, and the remote end of the MOS transistor Q2 is respecti...

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PUM

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Abstract

The invention discloses a current compensation circuit of a lithium protection chip. The circuit is applied to a battery pack and connected with the battery unit VCC of the battery pack. The circuit comprises a first sampling circuit, a second sampling circuit a current mirror module IC3. The first sampling circuit is connected with the battery unit VCC. The first sampling circuit is connected with the second sampling circuit. The second sampling circuit is connected with the current mirror module IC3. The current mirror module IC3 is connected with the first sampling circuit. The problem of power loss of the battery unit, which is generated during chip sampling detection, in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a current compensation circuit for a lithium battery protection chip. Background technique [0002] Nowadays, with the rise of the application of lithium batteries, the safety of lithium batteries in the process of use has been paid more and more attention. Lithium batteries will cause danger when the charging voltage is too high and the discharging voltage is too low, so lithium battery protection chips for this aspect have emerged as the times require. However, when voltage sampling is performed inside the protection chip, the sampling resistor inevitably consumes power, which makes the power of each battery cell unbalanced. Contents of the invention [0003] The purpose of the present invention is to provide a current compensation circuit for a lithium battery protection chip, which can solve the problem of power consumption of battery cells in the prior art when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18H02H1/00H02H1/06H02J7/00
CPCH02H7/18H02H1/0007H02H1/06H02J7/0014
Inventor 李世彬顾鹏展刘志军杨亚杰赵文川
Owner 成都芯港微电子有限公司