Voltage detecting circuit for multiple serial batteries

A technology of voltage detection circuit and series batteries, which is applied in the direction of measuring current/voltage, measuring electricity, measuring devices, etc., can solve the problems of limited number of series batteries, high cost, high power consumption, etc. The effect of low power consumption

Inactive Publication Date: 2010-07-07
中山市嘉科电子有限公司
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Problems solved by technology

[0002] In the existing battery management systems on the market, it is a technical problem to detect the voltage of each battery cell in a battery pack with multiple cells connected in series, especially in a battery pack with more than 4 cells connected in series. The lowest can only reach 20mV, the number of battery cells in series for detection is limited, the largest is only 13 cells, and the power consumption is also relatively large

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Embodiment Construction

[0012] see figure 1 , the present invention is a voltage detection circuit for multiple series batteries, including an operational amplifier N1, first and second resistors R1, R2, an insulated gate field effect transistor Q1 and a voltmeter V1, and the non-inverting input terminal of the operational amplifier N1 serves as The low potential detection input terminal, the inverting input terminal of the operational amplifier N1 is respectively connected to the source of the insulating gate field effect transistor Q1 and one end of the first resistor R1, and the other end of the first resistor R1 is used as the high potential detection input terminal, The output terminal of the operational amplifier N1 is connected to the gate of the IGSFET Q1, the drain of the IGSFET Q1 is grounded through the second resistor R2, and the input terminal of the voltmeter V1 is connected to the IGSFET Q1. The junction of the drain of the transistor Q1 and the second resistor R2.

[0013] The first ...

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Abstract

The invention discloses a voltage detecting circuit for multiple serial batteries, comprising an operational amplifier, a first resistor, a second resistor, an insulated gate field-effect transistor and a voltmeter. The same-phase input end of the operational amplifier is used as a low potential detecting input end, the invert-phase input end of the operational amplifier is respectively connected with the source electrode of the insulated gate field-effect transistor and one end of the first resistor, the other end of the first resistor is used as a high potential detecting input end, the output end of the operational amplifier is connected with the grid electrode of the insulated gate field-effect transistor, the drain electrode of the insulated gate field-effect transistor is grounded through the second resistor, and the input end of the voltmeter is connected to the drain electrode of the insulated gate field-effect transistor and the contact of the second resistor. The voltage detecting circuit can be used for detecting the voltage of each electric core in tens to hundreds of serial battery packs and has the advantages of high detecting precision, low cost, low power consumption and the like.

Description

[technical field] [0001] The invention relates to a voltage detection circuit of multiple series batteries. [Background technique] [0002] In the existing battery management systems on the market, it is a technical problem to detect the voltage of each battery cell in a battery pack with multiple cells connected in series, especially in a battery pack with more than 4 cells connected in series. The lower level can only reach 20mV, and the number of battery cells in series to be detected is limited, the largest is only 13 cells, and the power consumption is also relatively large. [Content of the invention] [0003] The present invention overcomes the disadvantages of the above technologies, and provides a voltage detection circuit capable of detecting the voltage of each battery cell in dozens to hundreds of series-connected battery packs, with high detection accuracy, low cost and low power consumption. [0004] In order to achieve the above object, the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/36
Inventor 俞峰赵胜娟
Owner 中山市嘉科电子有限公司
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