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Self-calibration circuit and self-calibration method

A self-calibration and circuit technology, which is applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve the problems of high cost and low precision, and achieve self-calibration cost reduction, high precision, reduction of analog-to-digital converters and digital compensation algorithms Effect

Active Publication Date: 2016-07-06
CRM ICBG (WUXI) CO LTD
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Problems solved by technology

[0009] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a self-calibration circuit and a self-calibration method for solving the problems of low precision and high cost of the battery pack cell voltage sampling system in the prior art

Method used

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  • Self-calibration circuit and self-calibration method

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Embodiment

[0059] like image 3 As shown, the self-calibration circuit 400 of this embodiment includes a programmable gain amplifier 410 and a programmable calibration code register 420 . The programmable calibration code register 420 is used to store a plurality of calibration codes, and the calibration code is corresponding to each sampling unit 110 of the battery pack cell voltage sampling system 100 , and its input terminal is connected to the battery pack cell voltage sampling system 100 . The output end of the decoder 140 is connected. According to the channel gating signal output by the decoder 140 , the calibration code of the corresponding channel is selected, and the calibration code is decoded to obtain the calibration code gating signal and output to the programmable gain amplifier 410 . The input end of the programmable gain amplifier 410 is connected to the output end of the multi-channel signal selector 120 of the battery pack cell voltage sampling system, the gating signa...

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Abstract

The present invention provides a self-calibration circuit and a self-calibration method suitable for a battery pack cell voltage sampling system. The self-calibration circuit is installed between a multi-channel signal selector and an output buffer of the battery pack cell voltage sampling system, including: Programmable Gain Amplifier and Programmable Calibration Code Register. The programmable calibration code register pre-stores multiple pre-calibrated calibration codes, which select the calibration code gate signal of the corresponding channel according to the channel gate signal output by the decoder of the battery pack cell voltage sampling system and output it to the programmable gain amplifier ; The programmable gain amplifier calibrates the battery pack voltage sampling system according to the calibration code strobe signal output by the programmable calibration code register. The invention not only calibrates the battery cell voltage sampling system, but also calibrates the self-calibration circuit itself, which greatly improves the accuracy of the sampling system; and it can be used for a long time with only one calibration, which reduces the calibration cost.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a self-calibration circuit and a self-calibration method suitable for a battery pack cell voltage sampling system. Background technique [0002] The battery pack cell voltage sampling system needs to sample the voltage of each cell in the battery pack, but due to the offset voltage and error of each device in the sampling system, and the signal will be lost during the transmission process, the actual sampling results There is a big difference in core voltage. [0003] like figure 1 As shown, the conventional battery pack cell voltage sampling system 100 includes a plurality of sampling units 110 , a multi-channel signal selector 120 , an output buffer 130 and a decoder 140 . Among them, one sampling unit 110 is correspondingly connected to the positive and negative ends of one cell 210 of the battery pack 200; the output ends of the plurality of sampling units 110 are connect...

Claims

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Application Information

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IPC IPC(8): G01R35/00
Inventor 罗丙寅尤勇李国成李进许林海张磊王玉洁李建民任会远
Owner CRM ICBG (WUXI) CO LTD
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