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A DC-AC Coupling Temperature Compensation Control Method

A technology of temperature compensation and control method, which is applied in the direction of temperature control using electric mode, auxiliary controller with auxiliary heating device, etc., which can solve the problems of inherent temperature fluctuation of cold head, poor system temperature stability, and difficulty in achieving low temperature requirements, etc. , to achieve real-time optimal control, reliable performance, and easy implementation

Active Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the inherent temperature fluctuation of the cold head in the low temperature system in the prior art due to the structure and working principle of the refrigerator itself, resulting in poor temperature stability inside the system and difficult to achieve low temperature requirements, the present invention provides a DC- AC-coupled temperature compensation control method, simple in principle and easy to implement

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  • A DC-AC Coupling Temperature Compensation Control Method
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  • A DC-AC Coupling Temperature Compensation Control Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The cold head 1 transfers the cold energy to the sample chamber 3 through the thermal connection 2, so that the sample chamber 3 reaches a low temperature. At the same time, the inherent temperature fluctuation of the cold head 1 is also transmitted to the sample chamber 3 through the thermal connection 2, resulting in the internal temperature of the low temperature system. The stability is poor, the heating device 4 is coupled to the sample chamber 3, and the temperature change of the sample chamber is monitored in real time through a thermometer. figure 2 As shown, the specific temperature fluctuation satisfies the formula (1): The temperature fluctuation is a single sinusoidal fluctuation, t is time, A(t)=4.44mK, f=1.72Hz,

[0063] Adjust the AC heating power on the heating device 3. The specific AC heating power fluctuation forms are as shown in formulas (3) and (4): q A (t)=q 0 (t) sin(2πft+Φ) and In the formula, f=1.72Hz, Φ=180°, and A(t)=4.44mK.

[0064]...

Embodiment 2

[0067] The basic parameters are the same as in Example 1, the temperature fluctuation amplitude of the cold head 1 increases, the thermal resistance of the sample cavity 3 increases, and the specific fluctuation form of the temperature change of the sample cavity 3 satisfies the formula (1), the temperature fluctuation is a single sinusoidal fluctuation, t is the time, A(t)=27mK, f=1.72Hz,

[0068] The temperature fluctuation on the sample chamber 3 is compensated by the AC heating power of different phases, so as to suppress the temperature fluctuation. Figure 5 and as shown in the table below:

[0069] Phase (°) Peak temperature fluctuation (mK) Temperature fluctuation suppression ratio (%) 0 27 0 30 26 4.0％ 60 22 19.5％ 90 16 41.9％ 120 8 69.0％ 150 4 86.0％ 180 10 63.1％ 210 17 36.7％ 240 23 15.4％ 270 26 2.0％

[0070] from Figure 5 It can be seen from the above table that when the AC heating powe...

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Abstract

The invention discloses a DC-AC coupled temperature compensation control method. According to the dynamic characteristics of temperature fluctuations transmitted from a cold head to a sample cavity, and based on negative feedback adjustment, a DC-AC wave coupling heat flow fluctuation form is adopted. The power of the heating device on the sample chamber is controlled by temperature compensation, which can track the temperature change in real time, adjust the control strategy, achieve the expected temperature set value and achieve long-term stability, which can solve the inherent temperature fluctuation due to the cold head of the refrigerator in the low temperature experimental system , which leads to the problem that the internal temperature stability of the system is poor and it is difficult to achieve the requirements of low temperature experiments; the optimal control mode can be selected according to different temperature fluctuations to realize real-time optimal control of single wave and mixed wave, which is easy to implement and has reliable performance.

Description

technical field [0001] The invention relates to a temperature compensation control method, in particular to a DC-AC coupling temperature compensation control method. Background technique [0002] With the development of science and technology, low temperature has become an important research object. Low temperature technology has important applications in the fields of superconductivity, medical care, high-energy physics, energy, aerospace and aerospace technology, controlled thermonuclear fusion, and far-infrared detection. . In researches such as thermophysical properties, mechanical properties experiments, and optical physics studies, it is necessary to maintain a constant low temperature experimental environment. Typically cryogenic fluids or small cryogenic refrigerators are used to provide cooling capacity to meet their temperature requirements. In view of the fact that the cryogenic refrigerator does not consume cryogenic liquid during operation, it has the advantag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/32
CPCG05D23/32
Inventor 陈慧刘迎文刘柳
Owner XI AN JIAOTONG UNIV