CN115185317A - A load-adaptive wide-load intelligent high-precision temperature control device - Google Patents

Abstract

The invention discloses a wide-load intelligent high-precision temperature control device with adaptive load, comprising a main controller module, an analog-to-digital conversion module, a temperature sensor probe module, a load module, a DAC module, three adjustable power output modules, a host machine module. The selected analog-to-digital conversion module has two current sources, one is for the temperature sensor probe, which is used to calculate the current temperature value; the other is for the load, which is used to calculate the current load value. The three adjustable power output modules cover the power output range of 0-100W, and are controlled by the DAC module; the main controller selects one of the adjustable power output modules according to the current load value, and according to the configuration information of the host computer module and the current Temperature information, calculate the output power through the internal PID algorithm, and adjust the temperature of the controlled target. By adopting the invention, the temperature control system can automatically identify the load and select the most suitable heating/cooling power, thereby realizing high-precision temperature control in a wide load range.

Description

A load-adaptive wide-load intelligent high-precision temperature control device

technical field

The invention relates to the technical field of precision measurement technology and high-precision temperature control, in particular to a wide-load intelligent high-precision temperature control device with adaptive load, which can be applied to other related fields of temperature measurement and temperature control.

Background technique

With the rapid development of atomic spin manipulation, precision spectroscopy, materials science and other technologies, quantum precision measurement technology based on atomic spin effect has attracted more and more researchers' attention due to its ultra-high detection sensitivity. In the field of quantum precision measurement, most systems will encounter the problem of precise control of the temperature of the target object, such as laser temperature control, atomic reaction gas chamber temperature control, these systems require different temperature indicators, such as Different atomic gas chambers have different target temperatures to be heated due to different volumes, and their required temperature control powers are also different. However, most of the temperature control systems in these fields have a feature that they have very high requirements for temperature control accuracy. , often above ±0.01°C.

Most of the traditional temperature control systems are developed for specific temperature control requirements, and their temperature control loads are mostly fixed or vary within a small range. In addition, the power output of the general system is essentially a power module. The parameters of the inductance and capacitance of the power module have their best matching parameters for different output loads. If the load changes greatly, the output power of the system will fluctuate. This kind of fluctuation itself will lead to the decrease of temperature control accuracy. Therefore, how to make the temperature control system have the same high-precision performance for different temperature control loads, so that the developed temperature control device can adapt to more different application scenarios, which has a very positive significance for the temperature control system.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides a wide-load intelligent high-precision temperature control device with adaptive load. The device uses a current source to output current to the current load of the system, and then uses an ADC module to collect the voltage across the load, so that the The current load size information can be detected, and then the appropriate power output module can be selected according to different loads, so that the fluctuation of the output power of the system can be as small as possible, thereby improving the temperature control accuracy on the circuit hardware and meeting the requirements of different loads. Requirements for high-precision temperature control systems.

In order to solve the above-mentioned technical problems, the technical scheme used in the present invention is: a wide-load intelligent high-precision temperature control device with adaptive load, which mainly consists of a main controller, an analog-to-digital conversion module, a temperature sensor probe, a load, and a controlled target. , DAC module, adjustable power output module and host computer module; the analog-to-digital conversion module is connected with the main controller, the temperature sensor probe and the load, the analog-to-digital conversion module is controlled by the main controller, and outputs current to the temperature sensor probe and the load. load; the analog-to-digital conversion module simultaneously collects the voltage across the temperature sensor probe; the temperature sensor probe is respectively connected with the analog-to-digital conversion module and the controlled target, the temperature sensor probe converts the temperature signal of the controlled target into a voltage signal, and the analog-digital The conversion module is collected; the load is connected to the controlled target, the analog-to-digital conversion module, the adjustable power output module and the main controller, and the voltage of the load is collected by the ADC module inside the main controller, which is used to calculate the current temperature control system load. Under the control of the main controller, the adjustable power output module outputs power to the load, and the load is wrapped on the surface of the controlled target to adjust the temperature of the controlled target; the controlled target is connected with the load and the temperature sensor probe, and the load The output power is loaded on the controlled target to change the temperature of the controlled target, and the temperature sensor probe senses the temperature of the controlled target; the DAC module is connected with the main controller and the adjustable power output module, and the main controller outputs the control information to the DAC module, so that it outputs different analog signals to control the output power of the adjustable power output module; the adjustable power output module is connected with the DAC module, the load and the main controller, and the adjustable power output module is controlled by the main controller The GPIO interface controls its switch state, and the output power is controlled by the DAC module; the host computer module is connected with the main controller, the host computer module sends instructions to the main controller, and receives the current temperature value information sent by the main controller.

Preferably, the adjustable power output module includes an adjustable low power output module, an adjustable medium power output module, and an adjustable high power output module, the power output of the adjustable low power output module is 0W-30W, and the The power output of the adjustable medium power output module is 30W-60W, and the power output of the adjustable high power output module is 60W-100W.

Preferably, the main controller is an industrial microprocessor with on-chip ADC module, SPI interface, I2C interface, GPIO interface and UART interface, including ARM processor, DSP processor or FPGA processor. The main controller mainly uses It is used to configure the analog-to-digital conversion module and DAC module, to control the switch state of the adjustable power output module, and to interact with the host computer module for data and instructions.

Preferably, the analog-to-digital conversion module is an output multi-channel independent current source, the current source can be configured from 10uA to 10mA, and the module has a 24-bit temperature acquisition module ADC, which can collect external signals with high precision.

Preferably, the temperature sensor probe is a PT1000 platinum resistance sensor. PT1000 is a temperature sensor commonly used in the industry. Its resistance value is closely related to temperature, and can be used to detect the temperature value within -200℃-800℃. Precision temperature sensing field.

Preferably, the load is a heating film or a cooling sheet, which needs to be determined according to the current ambient temperature and the target temperature value. If the current ambient temperature is less than the target temperature value, the heating film should be used to heat the controlled target; if the current temperature value is greater than If the target temperature value is set, the cooling chip should be used to cool the controlled target. The load resistance of the heating film and the cooling sheet is determined according to the power required for heating or cooling.

Preferably, the DAC module is used to convert the control signal generated by the main controller into an analog signal, so as to precisely control the output power of the adjustable power output module. The interface of the DAC module is an I2C interface, and its conversion accuracy depends on the actual temperature control accuracy requirements. Under the control accuracy requirement of ±0.01°C, a 12-bit or 14-bit DAC chip is generally selected.

Preferably, the adjustable power output module is a power module with a voltage follower pin, and its output voltage is controlled by the analog voltage signal output by the DAC module, and the external output power can be accurately adjusted. Considering the adjustable power output module The ripple factor of the output voltage and current, generally in the design of the inductor and capacitor parameter selection calculation, the adjustable low power output module selects the output power 20W as the parameter calculation benchmark, and the adjustable medium power output module selects the output power 50W as the parameter calculation benchmark , the adjustable high power output module selects the output power of 85W as the parameter calculation benchmark, which can ensure that the ripple of the output voltage and current is as small as possible within the output range of 0-100W, thereby ensuring the temperature control accuracy performance of the system in hardware. The selection of this module can refer to the LM5146 chip for design.

Preferably, the host computer module communicates with the main controller through the RS232 interface, the host computer module completes the human-computer interaction function, and has functions such as modifying the parameters of the temperature control system and displaying and storing temperature data in real time.

The advantages and positive effects of the invention are as follows: compared with the temperature control system commonly used in the market, the load-adaptive wide-load intelligent high-precision temperature control device has all its functions, and on the basis of its functions, it uses the module The current source of the digital conversion module and the ADC module of the main controller increase the load sensing function of the system, and add a number of adjustable power output modules, so the device can autonomously sense the load currently connected to the system, and at 0- 30W, 30W-60W, 60W-100W three adjustable power output modules, select an optimal module as the power output module of the whole system, so that it can achieve high precision in a wide load range such as 0-100W. Temperature control effectively makes up for the defect that the traditional temperature system can only have high-precision temperature control accuracy within a small load range, greatly broadens the use range of the temperature control system, and makes it suitable for more temperature control occasions.

Description of drawings

1 is an overall functional block diagram of a load-adaptive wide-load intelligent high-precision temperature control device of the present invention;

FIG. 2 is a flow chart of the steps of a load-adaptive wide-load intelligent high-precision temperature control device of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

As shown in Figure 1, a load-adaptive wide-load intelligent high-precision temperature control device includes a main controller 1, an analog-to-digital conversion module 2, a temperature sensor probe 3, a load 4, a controlled target 5, a DAC module 6, An adjustable power output module and a host computer module 10, wherein the adjustable power output module includes an adjustable low power output module 7, an adjustable medium power output module 8, and an adjustable high power output module 9, and the analog-to-digital conversion module 2 can use ADS1248 The analog-to-digital converter is connected as follows: the analog-to-digital conversion module 2 is connected to the main controller 1, the temperature sensor probe 3 and the load 4, the analog-to-digital conversion module 2 is controlled by the main controller 1, and the output current is sent to the temperature sensor probe 3 and the load 4. Load 4; the analog-to-digital conversion module 2 simultaneously collects the voltage at both ends of the temperature sensor probe 3; the temperature sensor probe 3 is respectively connected with the analog-to-digital conversion module 2 and the controlled target 5, and the temperature sensor probe 3 converts the temperature signal of the controlled target 5 into The voltage signal is collected by the analog-to-digital conversion module 2; the load 4 is connected to the controlled target 5, the analog-to-digital conversion module 2, the adjustable power output module and the main controller 1, and the voltage of the load 4 is collected by the ADC module of the main controller 1. , and calculate the size of the currently connected load; the adjustable power output module, under the control of the main controller 1, outputs power to the load 4, and the load 4 is wrapped on the surface of the controlled target 5 to adjust the temperature of the controlled target 5; The control target 5 is connected with the load 4 and the temperature sensor probe 3, the power output by the load 4 is loaded on the controlled target 5, and the temperature of the controlled target is changed, and the temperature sensor probe 3 senses the temperature of the controlled target 5; the DAC module 6 Connected with the main controller 1 and the adjustable power output module, the main controller 1 outputs control information to the DAC module 6, so that it outputs different analog signals to precisely control the output power of the adjustable power output module; the adjustable low power The output module 7 is connected to the DAC module 6 , the load 4 and the main controller 1 , and its switch state is controlled by the GPIO interface of the main controller 1 , and the output power is controlled by the DAC module 6 , and can output 0W-30W of power to the load. The adjustable medium power output module 8 is connected with the DAC module 6, the load 4 and the main controller 1, and its power output range is 30W-60W, its switching state is controlled by the GPIO interface of the main controller 1, and the output power is controlled by the DAC module 6 The adjustable high power output module 9 is connected with the DAC module 6, the load 4 and the main controller 1, its power output range is 60W-100W, its switching state is controlled by the GPIO interface of the main controller 1, and the output power is controlled by the DAC module 6 Control; the host computer module 10 is connected with the main controller 1, sends an instruction to the main controller 1, and receives the current temperature information sent by the main controller 1.

As shown in Figure 2, when the device is working, it first needs to detect the load size of the current system. The specific method is as follows. The main controller 1 configures the analog-to-digital conversion module 2 to output a current of 100uA to the load 4, and the main controller 1 automatically The ADC module of the belt collects the voltage value across the current load, so that the current load size can be calculated. According to the size of the current load, we can obtain the current optimal heating/cooling power through calculation, and then adjust the output power of three output powers: adjustable low power output module 7, adjustable medium power output module 8, and adjustable high power output module 9 Select the most suitable one among the modules, and turn off the other two modules. The switch of the module is controlled by the GPIO interface of the main controller 1. After selecting the appropriate power output module, it means that the hardware module for system temperature control has been selected. Next, the main controller 1 needs to receive the configuration information of the host computer module 10. The configuration information here mainly includes the temperature control target temperature value configuration, the PID algorithm parameter configuration, etc. After the configuration is completed, the main controller 1 needs to configure the analog-to-digital conversion module 2. Output 1mA current to the temperature sensor probe to generate voltage at both ends, and after being collected by the analog-to-digital conversion module 2, the main controller 1 reads the collected temperature value result, and obtains the current temperature information of the controlled target 5. The main controller 1 performs PID operation in combination with the current temperature value and the target temperature value information, and outputs the result calculated by the PID algorithm. The DAC module 6 converts the result into an analog signal, and precisely controls the adjustable power output module to output heating/cooling power to the outside. Load 4, adjust the temperature of the controlled object 5. At the same time, the adjusted temperature is collected by the system again, and the next cycle of automatic control process is carried out until the temperature control system is turned off.

Those of ordinary skill in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still understand the Modifications are made to the technical solutions described in the foregoing examples, or equivalent replacements are made to some of the technical features. All modifications and equivalent replacements made within the spirit and principle of the invention shall be included within the protection scope of the invention.

Claims (9)

1. A load-adaptive, wide-load, intelligent, high-precision temperature control device, comprising a main controller (1), an analog-to-digital conversion module (2), a temperature sensor probe (3), a load (4), and a controlled target (5) ), a DAC module (6), an adjustable power output module and a host computer module (10), characterized in that: the analog-to-digital conversion module (2), the main controller (1), the temperature sensor probe (3), the load (4) connected, the analog-to-digital conversion module (2) is controlled by the main controller (1), and outputs current to the temperature sensor probe (3) and the load (4); the analog-to-digital conversion module (2) simultaneously collects the temperature sensor probe (3) ); the temperature sensor probe (3) is respectively connected with the analog-to-digital conversion module (2) and the controlled target (5), and the temperature sensor probe (3) converts the temperature signal of the controlled target (5) into a voltage The signal is collected by the analog-to-digital conversion module (2); the load (4) is connected to the controlled target (5), the analog-to-digital conversion module (2), the adjustable power output module and the main controller (1), and the load ( 4) The voltage is collected by the ADC module inside the main controller (1) to calculate the current load of the temperature control system; the adjustable power output module, under the control of the main controller (1), outputs power to the load (4). ), the load (4) is wrapped on the surface of the controlled object (5), and the temperature of the controlled object (5) is adjusted; the controlled object (5) is connected with the load (4) and the temperature sensor probe (3), and the load (4) The output power is loaded on the controlled object (5) to change the temperature of the controlled object (5), and at the same time the temperature sensor probe (3) senses the temperature of the controlled object (5); the DAC module (6) Connected with the main controller (1) and the adjustable power output module, the main controller (1) outputs control information to the DAC module (6), so that it outputs different analog signals to control the output power of the adjustable power output module; The adjustable power output module is connected with the DAC module (6), the load (4) and the main controller (1). (6) Controlling the output power; the host computer module (10) is connected to the main controller (1), the host computer module (10) sends instructions to the main controller (1), and receives the main controller (1) The current temperature value information sent. 2. A load-adaptive wide-load intelligent high-precision temperature control device according to claim 1, wherein the adjustable power output module comprises an adjustable low power output module (7), an adjustable medium power An output module (8), an adjustable high power output module (9), the power output of the adjustable low power output module (7) is 0W-30W, and the power output of the adjustable medium power output module (8) is 30W-60W, the power output of the adjustable high power output module (9) is 60W-100W. 3. A load-adaptive wide-load intelligent high-precision temperature control device according to claim 1, characterized in that: the main controller (1) is an industrial microprocessor, which is provided with an on-chip ADC module, SPI Interface, I2C interface, GPIO interface and UART interface, including ARM processor, DSP processor or FPGA processor. 4 . The load-adaptive wide-load intelligent high-precision temperature control device according to claim 1 , wherein the analog-to-digital conversion module ( 2 ) is an output multi-channel independent current source, which is provided with 24 bits. 5 . The high-precision temperature acquisition module ADC is used for high-precision acquisition of external signals. 5 . The load-adaptive wide-load intelligent high-precision temperature control device according to claim 1 , wherein the temperature sensor probe ( 3 ) is a PT1000 platinum resistance sensor. 6 . 6 . The load-adaptive wide-load intelligent high-precision temperature control device according to claim 1 , wherein the load ( 4 ) is a heating film or a cooling sheet. 7 . 7 . The load-adaptive wide-load intelligent high-precision temperature control device according to claim 1 , wherein the DAC module ( 6 ) is connected to the I2C interface of the main controller ( 1 ), and is used to connect the The control signal generated by the main controller (1) is converted into an analog signal to precisely control the output power value of the adjustable power output module. 8. The wide-load intelligent high-precision temperature control device with adaptive load according to claim 1, wherein the adjustable power output module is a power module with a voltage follower pin, and its output voltage is controlled by a DAC The analog voltage signal output by the module is controlled. 9 . The load-adaptive wide-load intelligent high-precision temperature control device according to claim 1 , wherein the host computer module ( 10 ) communicates with the main controller ( 1 ) through an RS232 interface, and the The upper computer module (10) is used for human-computer interaction, modifying parameters of the temperature acquisition module ADC, and displaying and storing temperature data in real time.

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