高精度桥式传感器信号调理电路设计与实现

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英文篇名：Design and Implementation of Signal Conditioning Circuit for High Precision Bridge Sensor 作者：曲皎 ; 王红亮 ; 童一飞 英文作者：QU Jiao;WANG Hong-liang;TONG Yi-fei;North University of China,National Key Laboratory for Electronic Measurement Technology; 关键词：信号调理 ; 桥式传感器 ; FPGA ; 程控放大 ; 程控滤波 英文关键词：signal conditioning;;bridge sensor;;FPGA;;programmable amplification;;program-controlled filtering 中文刊名：YBJS 英文刊名：Instrument Technique and Sensor 机构：中北大学电子测试技术国家重点实验室; 出版日期：2019-04-15 出版单位：仪表技术与传感器 年：2019 期：No.435 语种：中文; 页：YBJS201904005 页数：5 CN：04 ISSN：21-1154/TH 分类号：24-27+32

摘要

针对桥式传感器数据采集系统中桥式传感器输出的信号微弱、噪声大,不能直接进行A/D采集的问题,为了提高数据采集系统的精度,设计了桥式传感器信号的调理电路。设计采用FPGA作为主控芯片,实现了整个调理电路的程控,并给出了电路的硬件设计;具体介绍了程控桥式传感器接口模块、程控放大模块和程控滤波模块的设计,放大增益范围为0～60 dB可调,滤波截止频率范围为0～50 kHz可调,操作方便,灵活性高,成本低,有着非常好的交流和直流性能。经仿真和实验验证,直流精度优于0.1%,能广泛应用于相关工程领域。
        Aiming at the problem that the signal output of the bridge sensor in the data acquisition system is weak and the noise is large so that can not be directly collected by A/D,to improve the bridge sensor signal accuracy,a signal conditioning circuit for bridge sensor was designed.The design adopted FPGA as the main control chip,the program control of the whole conditioning circuit was realized.The hardware design of the circuit was given.The design of program-controlled sensor interface module,program-controlled amplifier module and program-controlled filter module were introduced.The amplification gain range was adjustable from 0 to 60 dB,and the filter cutoff frequency range was adjustable from 0 to 50 kHz.The operation was convenient,the flexibility was high,the cost was low and had excellent AC and DC performance.The simulation and experimental results show that the accuracy is better than 0.1%,and it can be widely used in related fields.

引文

[1] 金申.高精度桥式传感器单片机仪表电路的设计[J].辽宁石油化工大学学报,1997(4):47-51.
    [2] 王德胜,倪焕明.微小信号反馈式程控放大电路[J].大地测量与地球动力学,2001,21(2):83-86.
    [3] WANG J,ZHU Z,LIU S,et al.A low-noise programmable gain amplifier with fully balanced differential difference amplifier and class-AB output stage[J].Microelectronics Journal,2017,64(C):86-91.
    [4] 胡忠林.高精度数据采集方法及其模块的研究与开发[D].南京:东南大学,2016.
    [5] 管敏杰,于爽,孟廷豪.程控增益放大电路研究[J].科技信息,2011(20):102-102.
    [6] 管敏杰,于爽,孟廷豪.程控增益放大电路研究[J].科技信息,2011(20):102.