Self-calibration temperature control device and method

A self-calibration temperature control device, mainly comprising:

• a temperature feedback and control unit connected with a controlled heating element to control the work state thereof, a precise temperature measurement unit connected with the controlled heating element to measure a stable temperature thereof, and a temperature calibration unit connected with the precise temperature measurement unit and the temperature feedback and control unit;
• wherein the temperature calibration unit is configured for obtaining temperature from the precise temperature measurement unit, dynamically calibrating temperature drift, and inputting the calibrated result into the temperature control and feedback unit;
• wherein the temperature feedback and control unit comprises:
• a negative temperature coefficient thermistor and an analog feedback control circuit that are connected with the controlled heating element to control the final stable temperature of the controlled heating element reaching the setting value through analog feedback control circuit;
• wherein the temperature calibration unit comprises:
• a CPU with a preset temperature range value and a preset resistance adjustment step value, being connected with the precise temperature measurement unit, a data latch circuit with an input end connected with the CPU through a bus, and a digital potentiometer connected with the temperature feedback and control unit, and an output end of the data latch circuit is connected with the digital potentiometer through the bus;
• Wherein the CPU comprises:
• a judging unit configured for judging whether the temperature value measured by the precise temperature measurement unit is within a preset range, a calibration parameter storage module configured for storing historical calibration parameter data, and a digital potentiometer connection step setting module, the digital potentiometer connection step setting module being configured to determine an updated calibration parameter value according to the historic calibration parameter data, and further to adjust a step value according to a preset resistance value.