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Direct current-alternating current coupled temperature compensation control method

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

Active Publication Date: 2021-09-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Direct current-alternating current coupled temperature compensation control method
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  • Direct current-alternating current coupled temperature compensation control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The cold head 1 transfers cold energy to the sample chamber 3 through the thermal connection 2, so that the sample chamber 3 reaches a low temperature. 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 by a thermometer, and the temperature fluctuation is as follows: 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 form is as formula (3) and (4): q A (t)=q 0 (t)sin(2πft+Φ) and Where f=1.72Hz, Φ=180°, A(t)=4.44mK.

[0064] like Figure 3a As shown, different AC heating powers are used to compensate the temperature fluctuations on the sample chamber 3 to suppress temperature fluctuations. The temperature fluctuation control diag...

Embodiment 2

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

[0068] The AC heating power of different phases is used to compensate the temperature fluctuation on the sample chamber 3, 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 power phas...

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Abstract

The invention discloses a direct current-alternating current coupled temperature compensation control method, which comprises the following steps of: performing temperature compensation control by adjusting the power of heating equipment on a sample cavity according to dynamic characteristics of temperature fluctuation transmitted from a cold head to the sample cavity, on the basis of negative feedback regulation and by adopting a direct current-alternating current wave phase coupled heat flow fluctuation form; the temperature change can be tracked in real time, the control strategy can be adjusted, the expected temperature set value is reached, long-term stability is achieved, and the problem that the low-temperature experiment requirement is difficult to achieve due to the fact that inherent temperature fluctuation exists in a refrigerating machine cold head in a low-temperature experiment system, and the system internal temperature stability is poor can be solved. Optimized regulation and control modes can be selected according to different temperature fluctuations, real-time optimal control over single waves and mixed waves is achieved, implementation is easy, and performance is reliable.

Description

technical field [0001] The invention relates to a temperature compensation control method, in particular to a DC-AC coupled 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 and health, high energy physics, energy, aerospace and aerospace technology, controlled thermonuclear fusion and far-infrared detection. . In such as thermophysical property measurement, mechanical property experiment, and optical physics research, it is necessary to maintain a constant low temperature experimental environment. Cryogenic fluids or small cryogenic refrigerators are usually used to provide cooling capacity to meet their temperature requirements. In view of the fact that cryogenic refrigerators do not consume cryogenic liquid during operation, and have the advantages o...

Claims

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Application Information

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