Direct current driving and active temperature control system for high-frequency pulse tube refrigerator and design method

Abstract

The invention discloses a direct current driving and active temperature control system for a high-frequency pulse tube refrigerator and a design method for the same. The system mainly comprises a first DC-DC (Direct Current-Direct Current) conversion module, a second DC-DC conversion module, a temperature signal operational amplification module, an analogue-digital signal conversion module, a digital signal processor, a digital-analogue signal conversion module, an H bridge power amplification module and a thermocouple temperature measurement electric bridge module. The temperature of the cold end of the refrigerator is acquired by the thermocouple temperature measurement electric bridge module, a temperature signal is converted into a proper voltage signal by the temperature operational amplification module, the voltage signal is further subjected to a series of signal processing of analogue-digital signal conversion, PID (Proportion Integration Differentiation) control, SPWM (Sinusoidal Pulse Width Modulation) signal modulation and digital-analogue signal conversion, and an output control signal can be used for efficiently driving the pulse tube refrigerator under direct current power, and performing active feedback control on the temperature of the cold end of the refrigerator. The system and the method are positively significant for the application of the high-frequency pulse tube refrigerator to the special fields of aerospace and the like.

Description

technical field [0001] The invention relates to the field of refrigeration and cryogenic engineering and the field of physical electronics, in particular to a DC drive and active temperature control system and design method of a pulse tube refrigerator. Background technique [0002] The pulse tube refrigerator is a major innovation of regenerative cryogenic refrigerators. It cancels the cold-end ejector widely used in conventional regenerative cryogenic refrigerators (such as Stirling and G-M refrigerators), and realizes the Low vibration, low interference, and no wear; and after structural optimization and important improvements in phase adjustment methods, its actual efficiency has reached the highest value of regenerative cryogenic refrigerators in typical temperature ranges. These remarkable advantages make the pulse tube refrigerator a hot spot in the research of cryogenic refrigerators in the past 30 years, and have been widely used in aerospace, low temperature electr...

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Problems solved by technology

The performance of these components is usually very sensitive to the operating temperature, and the slight external disturbance will often cause the operating temperature to fluctuate to a certain extent, thus affecting the performance of the cooled device

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