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A self-calibration circuit and self-calibration method

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

Active Publication Date: 2019-10-18
CRM ICBG (WUXI) CO LTD
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  • Description
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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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  • A self-calibration circuit and self-calibration method
  • A self-calibration circuit and self-calibration method
  • A self-calibration circuit and self-calibration method

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Embodiment

[0059] Such as 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 . Among them, 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 terminal of the decoder 140 is connected to select the calibration code corresponding to the channel according to the channel gating signal output by the decoder 140 , and decode the calibration code to obtain the calibration code gating signal and output it to the programmable gain amplifier 410 . The input end of the programmable gain amplifier 410 is connected with the output end of the multi-channel signal selector 120 of the battery pack cell voltage sampling system, a...

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Abstract

The present invention provides a self-calibration circuit and a self-calibration method suitable for a battery package electrical core voltage sampling system. The self-calibration circuit is installed between the multi-channel signal selector of the battery package electrical core voltage sampling system and an output buffer. The self-calibration circuit includes a programmable gain amplifier and a programmable calibration code register. The programmable calibration code register is configured to store a plurality of calibration codes in advance after beforehand calibration and select calibration code gating signals of a corresponding channel according to access gating signals outputted by the decoder of the battery package electrical core voltage sampling system to output the calibration code gating signals of the corresponding channel to the programmable gain amplifier, and the programmable gain amplifier is configured to calibrate the battery package electrical core voltage sampling system according to the calibration codes outputted by the programmable calibration code register. The self-calibration circuit and the self-calibration method are able to calibrate a battery package electrical core voltage sampling system and the self-calibration circuit itself so as to greatly improve the precision of the sampling system, and are able to use for a long time only requiring one-time calibration so as to reduce 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 transmission, the actual sampling result is different from the real voltage. There is a big difference in core voltage. [0003] Such as figure 1 As shown, the traditional battery 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 . Wherein, one sampling unit 110 is correspondingly connected with the positive and negative terminals of a cell 210 of the battery pack 200; the output terminals of a plurality of sampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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