摘要
设计了一种高精度温度测控系统。在恒流源测温电路中接入基准电阻作为系统测温的零度基准,放大电路对基准电阻与铂电阻两端的电压差进行放大;采用同步补偿法,在测温电路中接入采样电阻以获取A/D转换所需的参考电压,消除了恒流源电流的波动对系统测温性能的影响;通过分段线性化的方法对铂电阻测温的非线性进行补偿。基于MAX1968构建了高集成度的TEC驱动电路,采用增量式PID控制算法实现高精度的温度控制。实验结果表明,系统测温标准差为0.024℃,控温精度为±0.119℃。
A high precision temperature measurement and control system is designed. Benchmark resistor is used as a zero benchmark in the constant current source temperature measuring circuit,and the voltage difference between benchmark resistor and sampling resistor is amplified by the amplifying circuit. By the synchronous compensation method, the sampling resistor is connected to the temperature measuring circuit to get the reference voltage of the A/D converter. The influence of current fluctuations of constant current source on temperature measuring performance of the system can be eliminated. The method of piecewise linearization is used to compensate the nonlinear of platinum resistor temperature measurement. A highly integrated TEC driver circuit is constructed based on MAX1968, and the incremental PID control algorithm is used to achieve the high-precision temperature control. Experiment results indicated that the temperature measurement standard deviation is 0. 024℃ and the temperature control precision is ±0. 119℃.
出处
《北京信息科技大学学报（自然科学版）》
2014年第1期85-89,共5页
Journal of Beijing Information Science and Technology University
基金
北京市工程研究中心开放基金(GD2011003)
关键词
温度测控
高精度
铂电阻
恒流源
同步补偿
增量式PID
temperature measurement and control
high precision
platinum resistance
constant current source
synchronous compensation
incremental PID
