一种基于恒流源的温度补偿电路设计
Design of temperature compensation circuit based on constant current source
杨景灵 1焦新泉 1李辉景 1姜喜洋1
作者信息
- 1. 中北大学电子测试技术国家重点实验室,太原 030051
- 折叠
摘要
传感器通常采用金属或半导体作为其敏感元件,半导体材料在受到外界光热刺激时,其导电性能会发生显著变化,进而导致传感器的输出信号出现温度漂移现象.温度漂移严重影响着传感器的测量精度和应用范围,要想使其具有更高的温度稳定性,就必须对其进行温度补偿.压力传感器由于压阻系数受温度影响会产生温度漂移且温度灵敏度系数一般为负数,设计采用具有正温度系数的恒流源作为激励驱动传感器,通过经串并联电阻法补偿过的惠斯通电桥对传感器进行灵敏度温度补偿,使传感器在温差较大的环境下可以稳定输出.试验结果表明,压阻式压力传感器经过该二级补偿电路,在-50～75 ℃范围内,零点与满量程输出信号趋于稳定,误差小于0.35％FS.
Abstract
Sensors generally employ metals or semiconductors as their sensitive components.When semiconductor materials are subjected to external optical or thermal stimuli,their electrical conductivity undergoes significant changes,leading to temperature drift in the sen-sor's output signals.This temperature drift severely impacts the measurement accuracy and application scope of sensors.To enhance their temperature ability,temperature compensation is essential.Due to factors such as the piezoresistive coefficient being influenced by temperature,pressure sensors exhibit temperature drift,and the temperature sensitivity coefficient is typically negative.The design em-ploys a constant current source with a positive temperature coefficient as the excitation driver for the sensor.The wheatstone bridge,af-ter being compensated through series and parallel resistance methods,is then utilized to perform sensitivity temperature compensation on the sensor.Experimental results demonstrate that after undergoing compensation from this two-stage circuit,piezoresistive pressure sensors display stabilized output signals within a range of-50 ℃ to 75 ℃,with an error reduced to less than 0.35％FS.This approach effectively mitigates the impact of temperature drift,thereby enhancing the sensor's overall performance and reliability across a broader temperature spectrum.
关键词
恒流源/传感器/温度漂移/温度灵敏度系数/补偿电路Key words
constant current source/sensor/temperature drift/temperature sensitivity coefficient/the compensation circuit引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据