宽温区热敏电阻温度传感器调理电路  

Conditioning circuit for thermistor temperature sensor with wide temperature range

作　　者：井云鹏 智文虎 关恩明 张厚庆 JING Yunpeng;ZHI Wenhu;GUAN Enming;ZHANG Houqing(The 49th Research Institute of China Electronics Technology Group Corporation,Harbin 150028,China)

机构地区：[1]中国电子科技集团公司第四十九研究所,黑龙江哈尔滨150028

出　　处：《传感器与微系统》2024年第1期120-123,共4页Transducer and Microsystem Technologies

摘　　要：目前热敏电阻温度传感器电路一般采用电阻分压电路,非线性补偿温度范围一般在正温区10~100℃,非线性误差为0.5%;一些特殊应用场合要求热敏电阻测量范围在-45~+125℃。针对热敏电阻温度传感器使用温度范围越宽线性误差越大的问题,提出了一种宽温区热敏电阻温度传感器调理电路,采用精密恒流源激励,减小了热敏电阻温度传感器的自热问题,采用集成对数放大器与集成模拟乘法器进行线性化处理,调理电路具有非线性调节、零位调整、满量程调整3个功能,能够给出精确的标准电压0.1~4.9V信号,对每只热敏电阻温度传感器进行温度标定,根据标定数据进行最小二乘拟合,取得了良好的非线性和精度指标。实验结果表明:测温范围为-45~+125℃,非线性达到0.3%以下,测量误差达到±0.3℃。At present,thermistor temperature sensor circuits generally use resistive voltage divider circuits.The nonlinear compensation temperature range is generally in the positive temperature range of 10~100℃,with a nonlinear error of 0.5%,some special applications require a thermistor measurement range of -45~+125℃.Aiming at the problem that the wider the temperature range of the thermistor temperature sensor is used,the greater the linearization error is,a conditioning circuit of thermistor temperature sensor in wide temperature range is proposed.Using precision constant current source excitation reduces self heating issues in thermistor temperature sensors.The integrated logarithmic amplifier and integrated analog multiplier are used for linearization processing.The conditioning circuit has three functions of nonlinear adjustment,zero adjustment,and full range adjustment,which can provide accurate standard voltage signals range of 0.1~4.9 V.Temperature calibration on each thermistor temperature sensor is carried out,least squares fitting according to calibration data is performed,good nonlinearity and precision indicators are achieved.The experimental results indicate that the temperature measurement range of -45~+125℃,the nonlinearity reaches below 0.3%,and the measurement error reaches±0.3℃.

关 键 词：热敏电阻器 温度传感器 非线性误差 宽温区 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH89[自动化与计算机技术—控制科学与工程]