旋转加热辊温度测量电路设计

针对工业用旋转加热辊温度测量系统存在精度低、可靠性差、系统复杂等问题，给出了一种针对旋转加热辊温度测量电路的设计方法。该方法首先对加热辊温度测量的原理进行了分析；然后设计了基于DSP和PWM技术的温度测量方案，测温电路被制作成圆环形PCB，直接安装在加热辊转轴上，随辊体一起旋转，实时采集温度信号，再利用温度信号和PWM信号占空比呈线性关系，通过PWM信号的占空比即可反知温度大小，整套电路均通过DSP控制；最后给出了关键的信号调理电路，并通过实验证明了该方案的正确性和可行性。研究结果表明，该设计方案能满足工业用旋转加热辊温度测量对高精度、高可靠性的需求，有利于提高测温性能，具有一定的实用参考价值。

Design of temperature measurement circuit for rotational heated roller

Aiming at increasing the accuracy and reliability of the measurement and simplifying the system, a design proposal of the corre- sponding measurement circuit for the industrial heated roller was introduced. After analyzing of measurement principles, the design proposals based on DSP, PWM technology and related signal processing circuit were introduced. The measurement circuit, designed as a circular PCB, is installed on the spindle of the heated roller and rotated with the roller while real-time temperature signal was collected. Temperature was calculated through the duty of the PWM signal according to the linear relationship between the two parameters. The circuit was controlled through DSP. The correctness and feasibleness of the proposal were demonstrated through the experiments. The results indicate that the de- sign proposal can meet the requirement of temperature measurement for industrial rotational heated roller on accuracy and reliability, improve performance and have certain reference value.