CN107367093B - Intelligent controller for cryogenic refrigerator - Google Patents

Abstract

The invention discloses an intelligent controller of an ultra-low temperature refrigerator, which is applied to the high-speed accurate control of the ultra-low temperature refrigerator of a superconducting electronic system and comprises a main control module, and a temperature acquisition module, a current detection module, a voltage detection module, an inverter circuit module, a key/display module and a fan driving module which are connected with the main control module. The main control module adopts an ARM architecture processor, an SPWM technology and a PID closed-loop control algorithm, the control precision is less than or equal to 0.1K, the refrigeration climbing time is short, and the power consumption is low. The intelligent controller of the cryogenic refrigerator has the following beneficial effects: the refrigerating speed is fast, the efficiency is high, the volume is small, the control precision is high, the output voltage and the frequency are adjustable, and the refrigerating device is suitable for the ultralow temperature refrigerating machine with 0.3W-15W cold quantity, and the EMC and EMI protection is effective.

Description

Intelligent controller for cryogenic refrigerator

Technical Field

The invention relates to the field of control of a cryogenic refrigerator, in particular to high-speed accurate control and a method based on a Stirling cryogenic refrigerator system.

Background

The application and development of cryogenic refrigerators has remained a steady growth rate over the past several decades. With the development of high-temperature superconductivity and aerospace technologies, higher requirements are put forward on the refrigerating capacity, efficiency and reliability of the micro low-temperature refrigerator. The applications of early cryocoolers were mainly limited to cryopumps and infrared detection, GM coolers were mainly used in cryopumps and nuclear magnetic resonance instruments, and stirling coolers were more used in the field of infrared detectors and high temperature superconducting electronics. The Stirling refrigerator has the advantages of high efficiency, quick refrigeration, small size, light weight, low power consumption, low vibration, high reliability, long service life and the like, so that the miniature Stirling refrigerator is widely applied to the fields of infrared detectors and high-temperature superconducting electronics. Cryocoolers and control technology are subject to international blockages.

The traditional ultra-low temperature refrigerator controller directly adopts square wave drive, and refrigerating efficiency is not high, the vibration noise is great, and temperature control precision is not high, and the error is about 0.5K, causes superconducting filter central frequency drift, can't use in the occasion that requires that refrigerating efficiency is high, refrigeration speed is fast and temperature control precision is high.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide an intelligent controller for an ultra-low temperature refrigerator, which adopts an ARM architecture processor, an SPWM (Sinusoidal Pulse Width Modulation) technology and a PID (proportional Integral Derivative) closed-loop control algorithm to solve the disadvantages of the conventional controller, and has the characteristics of high refrigeration speed, high efficiency, high control precision, and adjustable output voltage and frequency.

The technical scheme adopted by the invention for solving the technical problems is as follows: the intelligent controller of the cryogenic refrigerator is constructed, is applied to the high-speed accurate control of the cryogenic refrigerator of a superconducting electronic system, and comprises a main control module, and a temperature acquisition module, a current detection module, a voltage detection module, an inverter circuit module, a key/display module and a fan driving module which are connected with the main control module; the main control module adopts an ARM architecture processor, an SPWM technology and a PID closed-loop control algorithm, and the control precision is less than or equal to 0.1K.

In the cryogenic refrigerator intelligent controller of the present invention:

the temperature acquisition module is used for sampling and amplifying the refrigeration temperature in real time and inputting the refrigeration temperature to the main control module for quantization and processing;

the current detection module is used for sampling the current of the cryogenic refrigerator in real time;

the voltage detection module is used for detecting the input voltage;

the inverter circuit module is used for enabling the main control module to control the on-off time of a switch according to the power required for driving the cryogenic refrigerator, so that direct current is converted into sine waves with unchanged amplitude variation frequency, and the cryogenic refrigerator is driven to work;

the button/display module is used for controlling the starting and the closing of the cryogenic refrigerator, setting parameters and displaying state information;

and the fan driving module is used for driving the speed-regulating fan to dissipate heat in the compressor, the expander and the superconducting electronic system equipment case of the cryogenic refrigerator.

In the intelligent controller of the cryogenic refrigerator, the all-metal shielding shell and the connector are adopted, so that the interference of the intelligent controller of the cryogenic refrigerator on a system is reduced, the heat dissipation is facilitated, and the reliability and the stability of the system are improved.

The intelligent controller of the cryogenic refrigerator has the advantages of high refrigeration speed, high efficiency, small volume, high control precision and adjustable output voltage, frequency and amplitude, is suitable for the cryogenic refrigerator with 0.3W-15W cold quantity, and can adjust effective EMC and EMI protection; wherein the control precision is less than or equal to 0.1K, the frequency adjustable range is 10 Hz-200 Hz, and the voltage adjustable range is 0-33V.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a block diagram of an intelligent cryogenic refrigerator controller in a superconducting electrical subsystem;

fig. 2 is a schematic diagram of the overall structure of an intelligent controller of a cryogenic refrigerator.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a novel controller of an ultra-low temperature refrigerator, which is applied to the high-speed accurate control of the ultra-low temperature refrigerator of a superconducting electronic system, adopts an ARM architecture processor, an SPWM technology and a PID closed-loop control algorithm, solves the defects of the traditional controller, and has the characteristics of high refrigeration speed, high efficiency, high control accuracy, adjustable output voltage frequency and amplitude and the like. Wherein the control precision is less than or equal to 0.1K, the frequency adjustable range is 10 Hz-200 Hz, and the voltage adjustable range is 0-33V. The product adopts the all-metal shielding shell and the connector, can effectively reduce EMI, is favorable for heat dissipation, and improves the reliability and stability of the system. The invention provides a control technology and a product for a refrigerator which is produced in China completely and nationally.

Fig. 1 is a block diagram of an intelligent controller of a cryogenic refrigerator in a superconducting electrical subsystem.

The cryogenic refrigerator controller 1 is directly connected with the cryogenic refrigerator 2 and used for monitoring the work of the cryogenic refrigerator 2, detecting the refrigeration temperature in the vacuum system 4, adjusting the power output of the cryogenic refrigerator 2 to enable the working environment of electronic devices in the vacuum system 4 to reach the set temperature, and realizing refrigeration maintenance within the temperature fluctuation range of less than or equal to 0.1K.

The intelligent controller 1 of the cryogenic refrigerator is directly connected with the superconducting electronic intelligent monitoring system 3, and the superconducting electronic intelligent monitoring system 3 can control the intelligent controller 1 of the cryogenic refrigerator and read the current state information of the cryogenic refrigerator, and the current state information is transmitted to the data monitoring center and displayed on the LCD.

Fig. 2 is a schematic diagram of the overall structure of the intelligent controller of the cryogenic refrigerator, which includes a main control module 5, and a temperature acquisition module 9, a current detection module 6, a voltage detection module 10, an inverter circuit module 8, a key/display module 11, and a fan driving module 7 connected to the main control module 5.

Master control module 5

An ARM architecture processor, an SPWM technology and a PID closed-loop control algorithm are adopted, and the control precision is less than or equal to 0.1K.

Current detection module 6

The current of the cryogenic refrigerator 2 is sampled in real time, and when the current exceeds a normal range, the power output is closed, so that the cryogenic refrigerator 2 is effectively protected.

Fan drive module 7

And 3 independent speed regulating fans are driven to dissipate heat in the compressor, the expander and the superconducting electronic system equipment case of the cryogenic refrigerator 2.

Inverter circuit module 8

The main control module 5 controls the on-off time of the switch according to the power required for driving the cryogenic refrigerator 2, converts the direct current into pulses with different widths, forms a sine wave with unchanged amplitude variation frequency through LC filtering and shaping, and drives the cryogenic refrigerator 2 to work.

Temperature acquisition module 9

The refrigeration temperature is sampled and amplified in real time and then input into the main control module 5 for quantization and processing.

Voltage detection module 10

And detecting the input voltage, and when the voltage exceeds a normal range, closing the power output and protecting the cryogenic refrigerator 2.

Key/display module 11

Controls the cryogenic refrigerator 2 on and off, parameter settings, and displays status information.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (2)

1. The intelligent controller of the cryogenic refrigerator is characterized by being applied to the high-speed accurate control of the cryogenic refrigerator of a superconducting electronic system and comprising a main control module, and a temperature acquisition module, a current detection module, a voltage detection module, an inverter circuit module, a key/display module and a fan driving module which are connected with the main control module; the main control module adopts an ARM architecture processor, an SPWM technology and a PID closed-loop control algorithm, and the control precision is less than or equal to 0.1K;

the adjustable range of the frequency is 10 Hz-200 Hz, and the adjustable range of the voltage is 0-33V;

the controller of the cryogenic refrigerator is directly connected with the cryogenic refrigerator and used for monitoring the work of the cryogenic refrigerator, detecting the refrigeration temperature in the vacuum system, and adjusting the power output of the cryogenic refrigerator to enable the working environment of electronic devices in the vacuum system to reach the set temperature and the temperature fluctuation to be less than or equal to 0.1K so as to realize refrigeration maintenance;

the intelligent controller of the cryogenic refrigerator is directly connected with the superconducting electronic intelligent monitoring system, and the superconducting electronic intelligent monitoring system can control the intelligent controller of the cryogenic refrigerator, read the current state information of the intelligent controller of the cryogenic refrigerator, transmit the current state information to the data monitoring center and display the current state information on the LCD;

adopt full metal shield shell and connector, reduce cryogenic refrigerator intelligent control ware is to the interference of system to be favorable to the heat dissipation, improve the reliability and the stability of system.

2. The intelligent controller for a cryogenic refrigerator according to claim 1,

the temperature acquisition module is used for sampling and amplifying the refrigeration temperature in real time and inputting the refrigeration temperature to the main control module for quantization and processing;

the current detection module is used for sampling the current of the cryogenic refrigerator in real time;

the voltage detection module is used for detecting the input voltage;

the inverter circuit module is used for enabling the main control module to control the on-off time of a switch according to the power required for driving the cryogenic refrigerator, so that direct current is converted into sine waves with unchanged amplitude variation frequency, and the cryogenic refrigerator is driven to work;

the button/display module is used for controlling the starting and the closing of the cryogenic refrigerator, setting parameters and displaying state information;

and the fan driving module is used for driving the speed-regulating fan to dissipate heat in the compressor, the expander and the superconducting electronic system equipment case of the cryogenic refrigerator.

Images