Temperature Control Method Based on Thermoelectric Effect

Abstract

The invention relates to a temperature control method based on a thermoelectric effect. A semiconductor temperature-difference module serves as a self-powered variable thermal resistor and also servesas a refrigeration / heating actuator, through the PWM technology and variable thermal resistor combined temperature control method, when a generated PWM control signal is in the high level, refrigeration / heating is conducted, and temperature control is conducted; and when the generated PWM control signal is in the low level, the controller drives and changes the thermal resistance of the semiconductor temperature-difference module according to a certain thermal resistance control algorithm to achieve temperature control. The temperature control method makes full use of the low-level time sequence of a PWM technology to conduct variable thermal resistance fine temperature-control, and the control efficiency and precision are improved. The system cost is low, control is easy, the temperaturecontrol precision is effectively improved, and the temperature control method can be widely applied to high-precision temperature control in different temperature regions.

Description

technical field [0001] The invention relates to a temperature control method based on thermoelectric effect, in particular to a temperature control method based on thermoelectric effect and combining PWM technology and variable thermal resistance. Background technique [0002] The thermoelectric effect is a reversible physical effect (Peltier effect, Thomson effect, and Seebeck effect), and its related technologies can realize thermoelectric power generation or electric drive for cooling and heating. The thermoelectric effect of semiconductors is quite significant. At present, semiconductor temperature control, which is widely used, has the advantages of small size, no mechanical moving parts, and simple and convenient control. [0003] Temperature is the most important controlled parameter, and high-precision temperature control has extremely wide application requirements and prospects. The temperature control system contains a pure hysteresis link, the heating / cooling act...

AI Technical Summary

Problems solved by technology

There are at least the following technical defects: adjusting the thermal resistance is not used for real-time temperature control, but only uses the thermal resistance to achieve the initial temperature state of the refrigerator at the set temperature, and applies thermal resistance adjustment to different temperature states of the refrigerator, while real-time temperature control It depends on the fine-tuning of the heater; in the specific temperature control route, only the absolute temperature state of the temperature fluctuation of the refrigerator itself is considered, and the thermal inertia, inertia, and inevitable factors of temperature change rate and change trend that affect the temperature control accuracy are not considered; the intermediate thermal Resistors adopt two methods of mechanical and thermal fluid, the controllability and response ability are extremely poor, and it cannot meet the technical requirements of real-time temperature control, and it is not and impossible to be designed for real-time temperature control; it requires a certain amount of power supply and consumes energy , generating an additional source of interference; applied and limited to the low temperature field

It sets variable thermal resistance between the heating actuator and cooling actuator of the temperature control device and the temperature control object. The variable thermal resistance has a basic thermal resistance, and the existence of the basic thermal resistance will reduce the execution efficiency of the heating actuator and cooling actuator. And increase power consumption; environmental fluctuations and disturbances delay feedback indirectly through the temperature change of the temperature control object, causing the temperature control signal to fail to respond to the impact of environmental fluctuations and disturbances in a timely manner; the proposed control method does not consider the thermal resistance between the temperature control object and the environment fluctuations and disturbances

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