CN115562392A - A Composite Temperature Control System Based on TEC and Heating Film - Google Patents

Abstract

The invention relates to a composite temperature control system based on TEC and a heating film, which comprises: the temperature information acquisition and processing module and the temperature control processing module; the temperature information acquisition and processing module comprises: the device comprises a heating film, a TEC refrigerating and heating device and a platinum resistor; the temperature control processing module receives real-time environment temperature acquired through a platinum resistor; when the difference between the real-time environment temperature and the preset temperature exceeds a set threshold, the temperature control processing module controls the heating film to operate to enable the environment temperature to rise, and when the difference between the real-time environment temperature and the preset temperature does not exceed the set threshold, the temperature control processing module controls the TEC refrigeration heater to operate to enable the environment temperature to reach the preset temperature; the problems of inaccurate temperature acquisition, slow temperature response, inaccurate control and the like in the prior art are solved, and the temperature precision stability for a long time is realized.

Description

A Composite Temperature Control System Based on TEC and Heating Film

technical field

The invention relates to the field of gravimeter precision measuring equipment, in particular to a composite temperature control system based on TEC and heating film.

Background technique

The determination of the earth's gravity field is of great significance to geodesy, space science, geophysics, geodynamics, marine science, resource exploration and modern military and other disciplines. The specific force measurement system composed of high-precision quartz flexible accelerometers It is the core sensor of gravity measurement, and the quartz flexible accelerometer is very sensitive to temperature. In the gravimeter measurement system, the temperature requirement reaches 0.01°C.

In a general temperature control system, the heating film in the main circuit is connected to the power supply in series with a temperature-sensitive resistor. When the temperature is low, the resistance of the temperature-sensitive resistor is small. The power supply heats the heating film through this resistor. When the device or device is heated to a certain temperature Finally, the resistance value of the temperature-sensitive resistor becomes larger, the main circuit is disconnected, and the heating film stops heating, so as to achieve the purpose of heating the equipment or device to a certain temperature range. Or use TEC heating or cooling to achieve the purpose of temperature control. The overall scheme adopted by the latter can control the temperature in a closed loop to achieve high control accuracy. However, the gravimeter equipment is fast and stable at a certain point and requires high precision. Among the temperature requirements, this solution cannot meet the design requirements, the temperature stabilization time is too long, and the control accuracy fluctuates in a long period, etc., and cannot meet the temperature requirements of precision measuring equipment such as a gravity meter.

Contents of the invention

Aiming at the technical problems existing in the prior art, the present invention provides a composite temperature control system based on TEC and heating film, which solves the problems of inaccurate temperature collection, slow temperature response, and inaccurate control in previous technical solutions, and has long-term temperature accuracy stability.

According to the first aspect of the present invention, a composite temperature control system based on TEC and heating film is provided, including: a temperature information collection and processing module and a temperature control processing module;

The temperature information collection and processing module includes: heating film, TEC refrigeration heater and platinum resistance;

The temperature control processing module receives the real-time ambient temperature collected by the platinum resistance thermometer;

When the difference between the real-time ambient temperature and the preset temperature exceeds a set threshold, the temperature control processing module controls the operation of the heating film to increase the ambient temperature, and the difference between the real-time ambient temperature and the preset temperature does not exceed the set threshold. When the threshold is reached, the temperature control processing module makes the ambient temperature reach the preset temperature by controlling the operation of the TEC refrigeration heater.

On the basis of the above technical solution, the present invention can also make the following improvements.

Optionally, the temperature control processing module includes: a core processor, a drive circuit and a temperature measurement circuit;

The core processor controls the operation of the heating film and the TEC refrigeration heater through the drive circuit;

The core processor is connected to the platinum resistor through the temperature measurement circuit to obtain the real-time ambient temperature.

Optionally, the core processor includes: DSP;

The drive circuit includes: a MOS tube gate driver and a MOS bridge;

The temperature measurement circuit includes: an analog-to-digital converter;

Optionally, the temperature control processing module separately controls the heating film and the TEC refrigeration heater through a certain duty cycle signal.

Optionally, the method for the temperature control processing module to control the heating film includes: when the difference between the real-time ambient temperature and the preset temperature exceeds a set threshold, controlling the heating film to heat with maximum power.

Optionally, the method for controlling the TEC refrigeration heater by the temperature control processing module includes: when the difference between the real-time ambient temperature and the preset temperature does not exceed the set threshold, according to the real-time ambient temperature and the preset temperature A digital PID operation is performed on the temperature deviation, and a control signal is output, and the real-time temperature reaches the set temperature by controlling the duty cycle of the TEC refrigeration heater.

Optionally, outputting the control signal further includes: determining whether the control signal exceeds a duty ratio limit, and if so, limiting the limit, and outputting and updating the limited control signal.

Optionally, the composite temperature control system also includes an interface communication module and a host computer;

The temperature control processing module receives the control command sent by the upper computer through the interface communication module, and sends the data of temperature, system state quantity, control parameter and duty cycle through the interface communication module in a certain order to the host computer to complete data interaction.

Optionally, the composite temperature control system uses airgel and a magnetic shield to construct a thermal-magnetic isolation chamber.

The present invention provides a composite temperature control system based on TEC and heating film, using heating film and TEC all-digital precision temperature control system, platinum resistance as temperature sensor, actuator as heating film and TEC two-way cooler, platinum resistance precision The temperature measurement feedback enters the temperature control system to adjust the output control quantity to realize high-precision temperature closed-loop control. Among them, when the temperature deviation is large, the heating film is operated at the maximum power to achieve rapid temperature rise inside the component. When the temperature deviation falls into the set smaller During the interval, the fuzzy PID control rate drives the TEC refrigeration system to realize the fine adjustment of the internal temperature of the module, and finally makes the internal temperature of the module stable at the set temperature in the shortest time, and realizes the wide temperature range of -25°C to +40°C. , the temperature fluctuation of the accelerometer combination is less than 0.1°C, and the maximum instantaneous power consumption at the beginning of temperature control is less than 50W; it mainly solves the problems of rapid response to temperature and high-precision closed-loop control of gravimeter and other measuring equipment. .

Description of drawings

Fig. 1 is a structural block diagram of an embodiment of a composite temperature control system based on a TEC and a heating film provided by the present invention.

detailed description

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

A composite temperature control system based on TEC and heating film provided by the present invention can be used in the field of accelerometer measurement systems, specifically the temperature control subsystem of the system, to improve the temperature response and accuracy of the temperature control system.

Fig. 1 is a structural block diagram of an embodiment of a composite temperature control system based on TEC and heating film provided by the present invention. As shown in Fig. 1, the composite temperature control system includes: a temperature information collection and processing module and a temperature control processing module .

The temperature information collection and processing module includes: heating film, TEC refrigeration heater and platinum resistance.

The temperature control processing module receives the real-time ambient temperature collected by the platinum resistance thermometer.

When the difference between the real-time ambient temperature and the preset temperature exceeds the set threshold, the temperature control processing module controls the operation of the heating film to increase the ambient temperature. When the difference between the real-time ambient temperature and the preset temperature does not exceed the set threshold, the temperature control processing module controls the TEC The cooling and heater operation makes the ambient temperature reach the preset temperature.

Aiming at the shortcomings of the thermosensitive resistor as a temperature acquisition and main loop control on-off scheme and the single TEC control scheme, the present invention provides a composite temperature control system based on TEC and heating film, using heating film and TEC full digital precision temperature control system , the platinum resistance is the temperature sensor, the actuator is the heating film and the TEC two-way cooler, the platinum resistance precision temperature measurement feedback enters the temperature control system to adjust the output control amount to achieve high-precision temperature closed-loop control, when the temperature deviation is large, the maximum The power operation realizes the rapid temperature rise inside the module. When the temperature deviation falls into the set small range, the fine adjustment of the internal temperature of the module is realized by driving the TEC refrigeration heater, and finally, the internal temperature of the module is stabilized at the set value in the shortest time. Fixed temperature, mainly solves the problems of inaccurate temperature collection, slow temperature response, and inaccurate control in the prior art, and has long-term temperature accuracy stability, and realizes rapid response to temperature and high-precision closed-loop control of gravimeter and other measuring equipment question.

Example 1

Embodiment 1 provided by the present invention is an embodiment of a composite temperature control system based on TEC and a heating film provided by the present invention. It can be seen from FIG. 1 that the embodiment of the composite temperature control system includes:

A temperature information collection and processing module and a temperature control processing module.

The temperature information collection and processing module includes: heating film, TEC refrigeration heater and platinum resistance.

In a specific implementation, the heating film may be a polyimide film.

The temperature control processing module receives the real-time ambient temperature collected by the platinum resistance thermometer.

When the difference between the real-time ambient temperature and the preset temperature exceeds the set threshold, the temperature control processing module controls the operation of the heating film to increase the ambient temperature. When the difference between the real-time ambient temperature and the preset temperature does not exceed the set threshold, the temperature control processing module controls the TEC The cooling and heater operation makes the ambient temperature reach the preset temperature.

In a possible embodiment, the temperature control processing module includes: a core processor, a drive circuit and a temperature measurement circuit.

The core processor controls the operation of the heating film and the TEC refrigeration heater through the driving circuit; the DSP is used as the core processor and the MOS tube is used as the power drive.

The core processor is connected with the platinum resistor through the temperature measurement circuit to obtain the real-time ambient temperature.

In a possible embodiment manner, the core processor includes: DSP.

The driving circuit includes: MOS transistor gate driver and MOS electric bridge.

The temperature measurement circuit includes: an analog-to-digital converter.

In a specific implementation, the model of the core processor may be DSP2812, the model of the MOS transistor gate driver may be MOS transistor gate driver IR2136, and the model of the analog-to-digital converter may be an integrated 24-bit analog-to-digital converter LTC2983. Based on the above links, the whole system realizes precise temperature closed-loop control.

In a possible embodiment, the temperature control processing module separately controls the heating film and the TEC refrigeration heater through a certain duty cycle signal.

In a possible embodiment, the method for controlling the heating film by the temperature control processing module includes: when the difference between the real-time ambient temperature and the preset temperature exceeds a set threshold, controlling the heating film to heat with maximum power.

In a possible embodiment, the method for controlling the TEC refrigeration heater by the temperature control processing module includes: when the difference between the real-time ambient temperature and the preset temperature does not exceed a set threshold, perform Digital PID operation, output control signal, make the real-time temperature reach the set temperature by controlling the duty cycle of the TEC refrigeration heater.

In a possible embodiment, outputting the control signal further includes: determining whether the control signal exceeds a duty ratio limit, and if so, limiting the limit, and outputting and updating the limited control signal.

It can be understood that the temperature control processing module completes system state initialization, temperature channel setting, and temperature reading, acquisition and conversion functions. Use the temperature difference between the metering temperature collected and fed back by the system and the temperature set by the system as input, select the output heating film power and TEC working mode according to the temperature deviation, and control the heating film and TEC actuator respectively through a certain duty ratio signal, closed-loop control To meet the requirements of the system's rapid response to the set temperature and accuracy. The process and steps of compound control are as follows:

①Comprehensively determine what stage the temperature control system is in based on the surface temperature, external temperature, and transition plate temperature, and implement different temperature control strategies at different stages. When it belongs to the heating stage, the system will heat with the maximum power of the heating film; when the temperature exceeds the system setting temperature, the system will start the TEC cooling mode; when the temperature is within the system setting range, the system will start the digital PID calculation, output the control signal, and automatically control The TEC duty cycle reaches the system set temperature value with a certain error.

②The PID control calculation module mainly completes the incremental PID calculation, completes the integral desaturation process when the integral is saturated, and unifies the control amount into duty cycle information and outputs it to the power module.

③Calculate the deviation between the temperature set in the table and the collected temperature, and input this deviation to the PID calculator for its calculation.

④ The PID calculator converts the temperature deviation into the required control amount according to the set control parameters.

⑤ Determine whether the control amount exceeds the duty cycle limit, if it exceeds the limit, and output and update the result of the control amount.

In a possible embodiment, the composite temperature control system further includes an interface communication module and a host computer.

The temperature control processing module receives the control commands sent by the host computer through the interface communication module, and sends the data such as temperature, system state quantity, control parameters and duty cycle to the host computer through the interface communication module in a certain order, so as to achieve Complete data interaction.

In a possible embodiment, the composite temperature control system uses airgel and a magnetic shielding plate to construct a thermal-magnetic isolation chamber.

The embodiment of the present invention uses airgel and a magnetic shielding plate to construct a thermal-magnetic isolation cavity, and arranges a polyimide film electric heater and a TEC refrigeration heater on the inertial assembly.

A composite temperature control system based on TEC and heating film provided by the embodiment of the present invention adopts heating film and TEC all-digital precision temperature control system. The precision temperature measurement feedback of resistance enters the temperature control system to adjust the output control quantity to realize high-precision temperature closed-loop control. Among them, when the temperature deviation is large, the heating film is operated at the maximum power to realize the rapid temperature rise inside the component. When the temperature deviation falls into the set When the interval is small, the fuzzy PID control rate drives the TEC refrigeration system to realize the fine adjustment of the internal temperature of the module, and finally stabilize the internal temperature of the module at the set temperature in the shortest time, and realize the wide temperature range environment of -25℃～+40℃ Under certain conditions, the temperature fluctuation of the accelerometer combination is less than 0.1°C, and the maximum instantaneous power consumption at the beginning of temperature control is less than 50W; it mainly solves the problems of rapid response to temperature and high-precision closed-loop control of gravimeter and other measuring equipment.

It should be noted that, in the foregoing embodiments, descriptions of each embodiment have their own emphases, and for parts that are not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce a machine for A device for realizing the functions specified in one or more procedures of a flowchart and/or one or more blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow diagram procedure or procedures and/or block diagram procedures or blocks.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is understood. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (9)

1. A composite temperature control system based on TEC and heating film, the composite temperature control system comprising: the temperature information acquisition and processing module and the temperature control processing module;

the temperature information acquisition and processing module comprises: the device comprises a heating film, a TEC refrigerating and heating device and a platinum resistor;

the temperature control processing module receives the real-time environment temperature acquired through the platinum resistor;

when the difference between the real-time environment temperature and the preset temperature exceeds a set threshold value, the temperature control processing module controls the heating film to operate to increase the environment temperature, and when the difference between the real-time environment temperature and the preset temperature does not exceed the set threshold value, the temperature control processing module controls the TEC refrigeration and heating device to operate to enable the environment temperature to reach the preset temperature.

2. The composite temperature control system of claim 1, wherein the temperature control processing module comprises: the temperature measuring circuit comprises a core processor, a driving circuit and a temperature measuring circuit;

the core processor controls the operation of the heating film and the TEC refrigerating and heating device through the driving circuit;

and the core processor is connected with the platinum resistor through the temperature measuring circuit to obtain the real-time environment temperature.

3. The composite temperature control system of claim 2,

the core processor includes: a DSP;

the drive circuit includes: a MOS transistor grid driver and a MOS bridge;

the temperature measurement circuit includes: an analog-to-digital converter.

4. The composite temperature control system of claim 1, wherein the temperature control processing module controls the heating film and the TEC cooling and heating device respectively according to a duty cycle signal.

5. The composite temperature control system of claim 4, wherein the method of the temperature control processing module controlling the heating film comprises: and when the difference between the real-time environment temperature and the preset temperature exceeds a set threshold value, controlling the heating film to heat at the maximum power.

6. The composite temperature control system of claim 4, wherein the method for the temperature control processing module to control the TEC cooling and heating device comprises: and when the difference between the real-time environment temperature and the preset temperature is not more than the set threshold value, carrying out digital PID operation according to the deviation between the real-time environment temperature and the preset temperature, outputting a control signal, and controlling the duty ratio of the TEC refrigerating and heating device to enable the real-time temperature to reach the set temperature.

7. The composite temperature control system of claim 6, wherein outputting the control signal further comprises: and judging whether the control signal exceeds the duty ratio amplitude limit, if so, limiting, and outputting and updating the control signal after amplitude limit.

8. The composite temperature control system of claim 1, further comprising an interface communication module and an upper computer;

the temperature control processing module receives a control command sent by the upper computer through the interface communication module, and sends data of temperature, system state quantity, control parameters and duty ratio to the upper computer through the interface communication module according to a certain sequence to finish data interaction.

9. The composite temperature control system of claim 1, wherein the composite temperature control system employs an aerogel and a magnetic shield to construct a thermomagnetic isolation chamber.

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