基于Δ-Σ模数转换器比例消源式测温方法研究  

The research on the method of temperature measurement based on Delta-Sigma analog-to-digital converter and proportional counteraction

作　　者：廖旭辉[1] 林定余 王尧君[1,3] 李鹏 景媛[3] 董凤华 LIAO Xuhui;LIN Dingyu;WANG Yaojun;LI Peng;JING Yuan;DONG Fenghua(National Institute of Measurement and Testing Technology,Chengdu 610021,China;Ningbo David Medical Device Co.,Ltd.,Ningbo 315000,China;Sichuan Radiation Technology Co.,Ltd.,Chengdu 610021,China)

机构地区：[1]中国测试技术研究院,四川成都610021 [2]宁波戴维医疗器械股份有限公司,浙江宁波315000 [3]四川中测辐射科技有限公司,四川成都610021

出　　处：《电子设计工程》2021年第2期1-5,共5页Electronic Design Engineering

基　　金：四川省科技服务业示范项目(2017GFW0172)。

摘　　要：为提高铂电阻传感器测温准确性,实现高精度测温目的,研究了比例式消源处理铂电阻输出电压信号的方法,利用Δ-Σ模数转换器高分辨率特性,结合比例式消源电路设计,消除因激励源不稳定造成铂电阻输出电压信号波动的情况,减小铂电阻信号放大处理电路温漂、噪声和放大器零点漂移等因素对测量结果造成的影响。详细分析比例式消源电路原理并给出相应理论计算过程、硬件电路设计及对应软件处理方法,提升了铂电阻测温系统对温度测量的准确性。实验结果表明,基于Δ-Σ模数转换器比例式消源处理铂电阻信号方法所搭建测温系统测量结果最大允许误差小于±0.03℃,年稳定性优于±0.05℃。In order to improve the temperature measurement accuracy of the platinum resistance sensor,the method of proportional anti-interference processing the output voltage signal of the platinum resistance is studied.The high-resolution characteristic of the Delta-Sigma analog-to-digital converter is used,combined with the proportional anti-interference circuit design,to eliminate the excitation source instability causes the fluctuation of the platinum resistance’s output voltage signal,and reduces the influence of factors such as temperature drift,noise and amplifier zero drift of the platinum resistance signal amplification processing circuit on the measurement results.The principle of proportional anti interference circuit is analyzed in detail,and the corresponding theoretical calculation process,hardware circuit designation and corresponding code are given.The experimental results show that the maximum allowable error of the temperature measurement system based on the proportional anti-interference circuit is less than±0.03℃,and the annual stability is better than±0.05℃.

关 键 词：温度 比例式消源电路 Δ-Σ模数转换器 铂电阻 

分 类 号：TN7[电子电信—电路与系统]