Design Of High Precision Temperature Control System Based On Fuzzy PID

With the development of science and technology,the requirements of industrial production and scientific experiments on temperature control are constantly improving.The development of high-precision temperature control system is an inevitable requirement of the development of related technologies.Especially in the field of optics,the development of solid-state laser,terahertz wave,area source blackbody and so on has been paid more and more attention.In the above fields,temperature is one of the key factors affecting the output performance of the system.The subtle change of temperature will lead to a variety of thermal effects inside the optical crystal,which will affect the output performance of the system and the service life of the system.Therefore,it is of practical significance to design a temperature control system which can meet the requirements of high-precision temperature control.In this paper,aiming at the situation of high-precision temperature control in the optical field,the functional requirements and performance indexes are analyzed.Combined with the semiconductor refrigeration technology,the temperature control algorithm is mainly studied.A high-precision large-scale temperature control system based on Fuzzy PID algorithm is designed.The system is divided into upper computer and lower computer.The hardware part of the lower computer includes: microprocessor module,temperature acquisition module,driver module,communication module and power module.In view of the variable working condition characteristics of semiconductor cooler and the shortcomings of traditional PID control algorithm,this paper designs a high-precision temperature control algorithm based on Fuzzy PID to improve the temperature control accuracy and setting speed of the system.The upper computer part adopts the embedded wince touch screen,and the communication interface of the upper and lower computers adopts the RS232 communication bus.The experimental results show that in the temperature control range of-30 ? ? 120 ?,the temperature control stability of the system is better than ± 0.002 ?,it can be stable at the set temperature within 220 s,and the temperature control performance is stable within two hours.The system has good adaptability to complex industrial environment,good robustness,small size,easy to carry,and meets the expected goal.