论域可变的模糊PID控制在半导体激光器温度控制系统中的应用

Application of Variable Domain Fuzzy PID Control in Semiconductor Laser Temperature Control System

半导体激光器输出的精准性和稳定性受温度的影响较大,温度的变化会导致半导体激光器阈值电流、电光转换效率和波长大小变化,进而影响输出功率。为了实现半导体激光器在设定温度条件下正常工作,设计了单片机为核心控制元件,热电制冷器(TEC)和PTC加热器为执行元件,AD590温度传感器和铂电阻PT1000为温度检测元件的温度控制系统,通过论域可变的模糊比例-积分-微分(PID)控制算法输出不同占空比的脉冲宽度调制波对温度进行控制。通过仿真分析,此控制算法不仅可以减小系统超调量,也具有很强的鲁棒性。最后实验结果表明,在-12~120℃的控温范围内,可以达到系统所要求±0.1℃的控温精度,并在250 s内达到预设温度。

The accuracy and stability of semiconductor laser’s output are greatly affected by temperature,temperature change will lead to the change of threshold current,electro-optic conversion efficiency and wavelength,and then affect the output power of semiconductor laser.As such,we designed a temperature control system for the normal operation of the semiconductor lasers at set temperature.This system uses a single chip microcomputer as the core control element,a thermoelectric cooler and a PTC heater as the executive elements,an AD590 temperature sensor and a PT1000 platinum resistor as the temperature detection elements.It controls the temperature by outputting pulse width modulation waves with different duty cycles through the variable-domain fuzzy proportional-integral-derivative(PID)control algorithm.Through simulation analysis,this control algorithm can not only reduce the system overshoot,but also possesses strong robustness.Experimental results indicate that the system can achieve the required temperature control precision of±0.1℃in the range of-12℃to 120℃and reach the target temperature within 250 s.