基于双PID控制的温度控制系统的设计与实现

摘要

为了使半导体激光器能够快速地达到稳定工作状态，提出并实验验证了一种串联双PID控制的高精度热电制冷器（TEC）温度控制系统，该控制系统的控制芯片采用飞思卡尔MC9S12XS128MAL单片机，通过负温度系数热敏电阻进行温度信息的采集，驱动电路采用BTN7971芯片驱动TEC工作，在软件编程上，通过采用串联PID算法，利用闭环负反馈结构实现温度的稳定控制。在实验中，当温度从26.6℃上升到目标温度40℃时，建立稳态的时间为40 s，超调量为0.1%，当温度从26℃下降到10℃时，建立稳态的时间为50 s，与常规PID控制系统相比，该系统具有更好的动态性能。%In order to enable the semiconductor laser to achieve a stable working state quickly,a high precision Thermoelectric Cooler(TEC)temperature-controlled circuit is proposed and experimentally demonstrated by using series double PID,a microcontroller of Freescale Semiconductor MC9S12XS128MAL is used in the controlled cir⁃cuit,and a negative temperature coefficient thermistor is used to collect temperature information ,the TEC chip is derived by the driving circuit with two BTN7971 chip to drive the TEC work,in the software programming,the sta⁃bility control of the temperature is realized by using the PID algorithm and the closed loop negative feedback struc⁃ture. In the experiment,when the temperature rises from 26.6℃to 40℃,the stabilized time is within 40 s,and the overshoot is about 0.1%,and when the temperature drops from 26℃to 10℃,the stabilized time is about 50 s. Com⁃pared with the conventional PID control system,the system has better dynamic performance.