Multi-channel Precision Temperature Control System Based on TEC

In order to meet the demand of precise temperature control of optical crystal in laser, a multi-channel precise temperature control system based on Tec is designed. The fuzzy algorithm is used to control and adjust the PID parameters automatically, so as to adapt to the variable parameter temperature control characteristics of different temperature ranges. The STM32 microprocessor is used as the main processing chip, and the platinum resistance PT1000 is used as the temperature sensor to control the heating or cooling of Tec module driven by H-bridge circuit, so as to realize the precise temperature control of the controlled object. A set of 4-way temperature precise control system is designed and completed. The experiment shows that the stability of the system is better than plus or minus 0.002 degrees in the temperature control range of -20-120 degrees Celsius, which meets the demand of multi-channel precise temperature control.