摘要
为了实现基于Pt100的温度测量和控制,该系统采用两路改进型Howland恒流源,分别将标准电阻和Pt100型铂热电阻的阻值转换为电压,通过仪用放大器差分放大后再送到MSP430单片机,运用最小二乘法拟合技术得到温度值;同时用PID算法控制PWM加热功率电阻,从而将温度控制到设定值。该系统具有控制精度高,超调量小,工作稳定,可靠的特点。
In order to achieve Temperature Measuring and Controlling System based on Pt100 Platinum Thermistor, the design used two modified Howland constant current source. These two current source converted the value of standard resistance and heat-resistance Pt100 to voltage respectively. Through the instrument amplifier, MSP430 got the amplified signal. Then the temperature value was obtained with the least squares fitting technology. At the same time, MSP430 u- tilized the PID algorithm to adjust PWM and control the temperature to reach the preset value. The system has the char- acteristics of high control precision, small overshoot, stable and reliable
出处
《仪表技术》
2013年第2期28-31,34,共5页
Instrumentation Technology
关键词
PT100
PID算法
串口通信
最小二乘法
滑窗均值滤波
Pt100
PID algorithm
serial communication
least square method
sliding window average filtering
