A high precision temperature control system based on temperature control element of thermoelectric cooler（ TEC） is designed according to the characteristics of fast rising and cooling speed and reversible cooling.The system takes highly integrated MCU E523. 05 as the core controller

Pt1000 as the temperature sensing element

and uses digital PID control algorithm for temperature closed-loop control. Through testing

the system has the characteristics of high temperature control precision

fast rate of rise and drop

small error and high reliability.In the temperature range of 0 ～ 80 ℃

the temperature acquisition precision can reach 0. 03 ℃

and the control precision can reach 0. 1 ℃ . This system has many application occasions

for example

temperature control of laser

dry well furnace

has certain application value.