基于自整定模糊PID算法的LD温度控制系统

为了使半导体激光器(LD)能够稳定工作, 设计并实现了一个高效的温度控制系统。该系统使用MSP430单片机作为处理器,负温度系数热敏电阻(NTC)作为温度传感器,半导体制冷器(TEC)作为执行元件。系统通过自整定模糊PID算法,采用闭环负反馈结构实现对LD温度的稳定控制。实验结果表明,该控制系统温度从21.9 ℃上升到目标温度25 ℃,建立稳态的时间为68 s,且温度可控制在250.05 ℃范围以内。工作94 s后,系统能够将温度控制在250.008 ℃范围以内。与常规PID控制系统相比,基于模糊PID算法的温度控制系统能够在没有人工干预的情况下自动调节系统的PID参数,使系统具有更好的动态性能。

LD temperature control system based on self-tuning fuzzy PID algorithm

In order to make a laser diode(LD) work stably, a highly efficient temperature control system was designed and implemented. The system was made up of the MSP430 microcontroller, negative temperature coefficient thermistor(NTC) and thermoelectric cooler(TEC), respectively, as control unit, temperature sensor and actuation element. Based on the self-tuning fuzzy PID algorithm, the negative feedback loop was adopted for controlling the temperature of a laser diode and enabling it to work stably. Experimental results show that the system stabilized the temperature within 250.05 ℃ in 68 seconds when it rose from 21.9 ℃ to 25 ℃. After 94 seconds, the temperature can stay within 250.008 ℃. Compared with a conventional PID control system, the temperature control system based on self-tuning fuzzy PID algorithm can adaptively adjust PID parameters in the system without manual operation. Therefore, the system has a better dynamic performance.