High-precision spaceborne temperature control system and method

Abstract

The application discloses a kind of high-precision satellite temperature control system and method, including first temperature measurement circuit and second temperature measurement circuit;The output end of first temperature measurement circuit is connected respectively the input end of first amplification circuit and the input end of acquisition module, the input end of acquisition module is connected to the output end of first amplification circuit;The output end of second temperature measurement circuit is connected respectively the input end of second amplification circuit and the input end of acquisition module, the input end of acquisition module is connected to the output end of second amplification circuit;The output end of acquisition module is connected the input end of control and processing module, the input end of first temperature control module and the input end of second temperature control module are connected respectively to the output end of control and processing module;The output end of first temperature control module is connected the input end of first heating wire module;The output end of second temperature control module is connected the output end of first heating wire module.Effectively improve the temperature control stability of satellite temperature control system, so that high-precision satellite temperature control system has more extensive adaptability and practicality.

Description

Technical Field

[0001] This invention belongs to the field of detection technology, specifically to a high-precision spaceborne temperature control system and method. Background Technology

[0002] With the continuous development and deepening of my country's deep space exploration, the demand for capturing and processing microscopic information in space is increasing, leading to the widespread use of high-performance and high-precision components. Because temperature variations in the space environment are far more complex and volatile than those on Earth, drastic temperature changes in the environment of precision components directly affect their performance and output accuracy. For example, in the polarization analyzer of a spaceborne optical payload, when the ambient temperature fluctuates by more than 0.1℃, the arrangement of its internal liquid crystals will change, affecting optical path polarization and tuning filtering effects, significantly reducing the observation accuracy of the optical payload, and potentially causing mission failure in severe cases.

[0003] Traditional spaceborne temperature control design methods primarily address the environment within the satellite platform cabin. These methods result in a large temperature control area, low temperature measurement resolution, and poor temperature stability. However, the electronic systems within the platform cabin generally operate at low speeds, primarily serving functions such as overall satellite resource scheduling, management, and data storage. They are not highly sensitive to environmental temperature fluctuations and their performance remains relatively stable over a wide temperature range. Currently, traditional spaceborne temperature control design methods achieve a temperature control stability of 0.5℃ / 30min, which fully meets the temperature control requirements of electronic equipment within the satellite platform cabin. However, this is far from sufficient for the constant temperature control requirements of extremely temperature-sensitive components. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a high-precision spaceborne temperature control system and method, which effectively improves the temperature control stability of the spaceborne temperature control system (reaching 0.05℃), making the high-precision spaceborne temperature control system more widely adaptable and practical.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-precision spaceborne temperature control system includes a first temperature measuring circuit and a second temperature measuring circuit;

[0007] The output terminal of the first temperature measuring circuit is connected to the input terminal of the first amplifier circuit and the input terminal of the acquisition module, respectively; the output terminal of the first amplifier circuit is connected to the input terminal of the acquisition module.

[0008] The output terminal of the second temperature measuring circuit is connected to the input terminal of the second amplifier circuit and the input terminal of the acquisition module, respectively; the output terminal of the second amplifier circuit is connected to the input terminal of the acquisition module.

[0009] The output terminal of the acquisition module is connected to the input terminal of the control and processing module. The output terminal of the control and processing module is connected to the input terminals of the first temperature control module and the second temperature control module, respectively. The output terminal of the first temperature control module is connected to the input terminal of the first heating wire module. The output terminal of the second temperature control module is connected to the output terminal of the first heating wire module.

[0010] Preferably, the interface between the first temperature measuring circuit and the second temperature measuring circuit uses a Wheatstone bridge.

[0011] Preferably, the first temperature measuring circuit and the second temperature measuring circuit have the same structure.

[0012] Preferably, the first temperature measuring circuit includes a first thermistor module, a bridge conversion module, and a signal conditioning module;

[0013] The output of the first thermistor module is connected to the input of the bridge converter module, the output of the bridge converter module is connected to the input of the signal conditioning module, and the output of the signal conditioning module is connected to the input of the first amplifier circuit and the input of the acquisition module, respectively.

[0014] A high-precision spaceborne temperature control method includes the following processes:

[0015] The first temperature measurement circuit performs preliminary data acquisition in the first stage, obtaining a rough value of the current temperature across the entire temperature range. It then activates the first-stage temperature control mechanism to adjust the temperature of the device under test to the target temperature range. The second stage then acquires the precise value of the current temperature through the first amplification circuit. It then activates the second-stage temperature control mechanism, which dynamically adjusts the heating duty cycle in real time using PID control to make the temperature of the device under test approach the target temperature value in a smooth, micro-amplitude oscillation manner, thus achieving dynamic equilibrium.

[0016] When the first temperature measuring circuit malfunctions, the control and processing module activates the second temperature measuring circuit to control the temperature.

[0017] Preferably, it includes the following steps:

[0018] Step 1: The first temperature measurement circuit performs a coarse temperature sampling and judges whether the temperature sampling value is greater than the lower limit of the temperature control range; if it is greater than the lower limit of the temperature control range, it is compared with the upper limit of the temperature control range, and Step 4 is executed; if it is less than the lower limit of the temperature control range, the sampling number is recorded, and Step 2 is executed.

[0019] Step 2: Determine if the number of data collections in Step 1 is less than the preset number. If it is less than the preset number, start full-power heating and return to Step 1. If it is greater than the preset number, read the first and last data collection values ​​for comparison and proceed to Step 3.

[0020] Step 3: Determine whether the first and last collected values ​​are within the deviation range. If yes, start full-power heating and return to step 1. If no, mark the first temperature measuring circuit as faulty, and the control and processing module starts the second temperature measuring circuit and executes step 9.

[0021] Step 4: When the coarse sampling temperature value is greater than the lower limit of the temperature control, compare it with the upper limit of the temperature control range: Is it less than the upper limit of the temperature control range? If yes, proceed to the fine sampling process and execute Step 7; if no, record the number of samplings and execute Step 5.

[0022] Step 5: Determine if the number of data collections is less than the preset number. If yes, stop heating and return to Step 1; otherwise, read the first and last data collection values ​​for comparison.

[0023] Step 6: Determine whether the first and last collected values ​​are within the deviation range. If yes, stop heating and return to step 1; if no, mark the first temperature measuring circuit as abnormal, and the control and processing module starts the second temperature measuring circuit and executes step 9.

[0024] Step 7: After entering the temperature fine sampling stage, determine whether the sampled value is below the deviation range of the temperature control precision range. If so, the PID will heat at full power and return to step 1; if not, further determine the upper limit of the precision range.

[0025] Step 8, Precise temperature control range upper limit judgment: Is it higher than the deviation range of the target value? If yes, stop heating and return to step 1; if no, substitute the collected value into the PID temperature control algorithm to calculate the heating duty cycle, use PWM to control the heating power and return to step 7;

[0026] Step 9: The second temperature measurement circuit performs a coarse temperature sampling and judges whether the temperature sampling value is greater than the lower limit of the temperature control range; if it is greater than the lower limit of the temperature control range, it is compared with the upper limit of the temperature control range, and step 12 is executed; if it is less than the lower limit of the temperature control range, the sampling number is recorded, and step 10 is executed.

[0027] Step 10: Determine if the number of data collections in Step 1 is less than the preset number. If it is less than the preset number, start full-power heating and return to Step 9. If it is greater than the preset number, read the first and last data collection values ​​for judgment and execute Step 11.

[0028] Step 11: Determine whether the first and last collected values ​​are within the deviation range. If yes, start full-power heating and return to step 9; if no, mark the second temperature measurement circuit as abnormal and end temperature control.

[0029] Step 12: When the coarse sampling temperature value is greater than the lower limit of the temperature control, compare it with the upper limit of the temperature control range: Is it less than the upper limit of the temperature control range? If yes, proceed to the fine sampling process and execute step 15; if no, record the number of samplings and execute step 13.

[0030] Step 13: Determine if the number of data collections is less than the preset number. If yes, stop heating and return to step 9; otherwise, read the first and last data collection values ​​for comparison.

[0031] Step 14: Determine whether the first and last collected values ​​are within the deviation range. If yes, stop heating and return to step 9; if no, mark the second temperature measuring circuit as abnormal and end temperature control.

[0032] Step 15: After entering the temperature fine sampling stage, determine whether the sampled value is below the deviation range of the temperature control precision range. If so, the PID will heat at full power and return to step 9; if not, further determine the upper limit of the precision range.

[0033] Step 16, Precise temperature control range upper limit judgment: Is it higher than the deviation range of the target value? If yes, stop heating and return to step 9; if no, substitute the collected value into the PID temperature control algorithm to calculate the heating duty cycle, use PWM to control the heating power and return to step 15.

[0034] Furthermore, in step 1, before coarse sampling, the control and processing module receives external instructions to update the target temperature value of the temperature control system. If no relevant instructions are received, the default value of 35°C is maintained.

[0035] Furthermore, in step 1, the preset number of data collections is 10.

[0036] Furthermore, in step 1, the deviation range between the first and last collected values ​​is 10%.

[0037] Compared with the prior art, the present invention has the following beneficial technical effects:

[0038] This invention provides a high-precision spaceborne temperature control system. By employing a first temperature measurement circuit and a second temperature measurement circuit to form a primary temperature control link and a backup temperature control link, the backup link automatically intervenes when either link malfunctions, without requiring third-party intervention. This ensures continuous and stable operation of the temperature control system, improves its reliability and safety, and makes the high-precision spaceborne temperature control system more widely adaptable and practical.

[0039] This invention provides a high-precision spaceborne temperature control method. Based on the traditional temperature control system design architecture, it employs a step-by-step iterative acquisition method and introduces an intelligent temperature control design method combining dynamic interactive acquisition and real-time PID control. This effectively improves the temperature stability of the spaceborne temperature control system (reaching 0.05℃), making the high-precision spaceborne temperature control system more widely adaptable and practical. This invention enables autonomous on-orbit precise temperature control of the polarization analyzer and returns the real-time temperature values ​​and control coefficients of the polarization analyzer as telemetry parameters to the payload platform's main control computer for storage. These parameters are then transmitted back to the ground control base via the satellite platform. Ground personnel can access the parameters to understand all temperature values ​​and operating statuses of the polarization analyzer throughout its on-orbit lifespan, serving as supplementary data for analyzing the payload platform's observations and assessing its remaining operational lifespan. Attached Figure Description

[0040] Figure 1 This is a block diagram illustrating the principle of the high-precision spaceborne temperature control system of the present invention.

[0041] Figure 2 This is a circuit diagram of a high-precision spaceborne temperature control system according to the present invention;

[0042] Figure 3 This invention provides a high-precision spaceborne temperature control method and its working process. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0044] like Figure 1 As shown, a high-precision spaceborne temperature control system of the present invention includes a first temperature measuring circuit and a second temperature measuring circuit.

[0045] The output of the first temperature measuring circuit is connected to the input of the first amplifier circuit and the input of the acquisition module, respectively. The output of the first amplifier circuit is connected to the input of the acquisition module.

[0046] The output of the second temperature measurement circuit is connected to the input of the second amplifier circuit and the input of the acquisition module, respectively. The output of the second amplifier circuit is connected to the input of the acquisition module.

[0047] The output of the acquisition module is connected to the input of the control and processing module. The output of the control and processing module is connected to the input of the first temperature control module and the input of the second temperature control module. The output of the first temperature control module is connected to the input of the first heating wire module. The output of the second temperature control module is connected to the output of the first heating wire module.

[0048] The first temperature measurement circuit, the first amplifier circuit, the first temperature control module, and the first temperature control module together form the primary temperature control link. The second temperature measurement circuit, the second amplifier circuit, the second temperature control module, and the second temperature control module together form the backup temperature control link. If any one of these links malfunctions, the backup temperature control link automatically intervenes without third-party intervention. This ensures the continuous and stable operation of the temperature control system, improves its reliability and safety, and makes the high-precision spaceborne temperature control system more widely adaptable and practical.

[0049] The first temperature measuring circuit and the second temperature measuring circuit have the same structure. The first temperature measuring circuit includes a first thermistor module, a bridge conversion module, and a signal conditioning module.

[0050] The output of the first thermistor module is connected to the input of the bridge converter module, the output of the bridge converter module is connected to the input of the signal conditioning module, and the output of the signal conditioning module is connected to the input of the first amplifier circuit and the input of the acquisition module, respectively.

[0051] The second temperature measurement circuit includes a second thermistor module, a bridge conversion module, and a signal conditioning module. The output terminal of the second thermistor module is connected to the input terminal of the bridge conversion module, the output terminal of the bridge conversion module is connected to the input terminal of the signal conditioning module, and the output terminal of the signal conditioning module is connected to the input terminal of the second amplifier circuit and the input terminal of the acquisition module, respectively.

[0052] Example

[0053] like Figure 2 As shown in the application circuit block diagram, the temperature measurement circuit uses a Wheatstone bridge to convert resistance into voltage. The load voltage of the Wheatstone bridge arm is provided by a reference source to ensure the accuracy of the temperature conversion. The back-end acquisition circuit is designed with a step-by-step iterative acquisition method: the first stage performs preliminary acquisition (coarse acquisition), obtaining a rough value of the current temperature over the entire temperature range, and activating the first-stage temperature control mechanism (full power or 0 power) to quickly adjust the temperature of the device under test to the target temperature range; then the second stage performs acquisition (fine acquisition), obtaining a precise value of the current temperature within a narrow range (±2.5℃) through a small-signal amplification circuit, and activating the second-stage temperature control mechanism (real-time PID dynamic adjustment of the heating duty cycle) to make the temperature of the device under test approach the target temperature value in a smooth, micro-amplitude oscillation manner, ultimately achieving dynamic equilibrium.

[0054] Table 1. List of pins and components for the application circuit

[0055]

[0056]

[0057] Furthermore, this design method employs a dual-backup design for both the temperature measurement and control interfaces, and adds a primary / backup switching mechanism to the closed-loop temperature control strategy. By default, a primary / secondary temperature measurement circuit and a primary / secondary temperature control circuit form a closed-loop temperature control link structure. When any one of these circuits malfunctions, the backup temperature control link automatically intervenes without third-party intervention. This design method ensures continuous and stable operation of the temperature control system, improves its reliability and safety, and makes the high-precision spaceborne temperature control system more widely adaptable and practical.

[0058] like Figure 3 As shown, the specific steps of a high-precision spaceborne temperature control method of the present invention are as follows:

[0059] Step 1: Receive external instructions and update the target temperature value of the temperature control system. If no relevant instructions are received, maintain the default value of 35℃.

[0060] Step 2: Initiate coarse temperature sampling of the primary temperature control link and determine whether the sampled value is greater than the lower limit of the temperature control range. If so, compare it with the upper limit of the temperature control range; if not, record the number of samplings.

[0061] Step 3: Determine if the number of data collections is less than 10. If yes, start full-power heating and return to Step 2; otherwise, read the first and last data collection values ​​for comparison.

[0062] Step 4, determine the first and last collected values: is the deviation 10%? If yes, start full-power heating and return to step 2; if no, mark the main temperature measurement link as abnormal, set the telemetry parameter and start the backup temperature control link;

[0063] Step 5: If the coarse sampling temperature value is greater than the lower limit of the temperature control range, compare it with the upper limit of the temperature control range: Is it less than the upper limit of the temperature control range? If yes, proceed to the fine sampling process; if no, record the number of samplings.

[0064] Step 6: Determine if the number of data collections is less than 10. If yes, stop heating and return to Step 2; otherwise, read the first and last data collection values ​​for comparison.

[0065] Step 7, Determine if the first and last collected values ​​deviate by 10%. If yes, stop heating and return to step 2; if no, mark the primary temperature measurement link as abnormal, set the telemetry parameter and start the backup temperature control link.

[0066] Step 8: After entering the temperature fine sampling stage, determine whether the sampled value is 0.05℃ lower than the target value within the precise temperature control range. If yes, the PID controller will operate at full power and return to step 2; otherwise, further determine the upper limit of the precise range.

[0067] Step 9, Precise temperature control range upper limit judgment: Is it higher than the target value by 0.03℃? If yes, stop heating and return to step 2; if no, substitute the collected value into the PID temperature control algorithm to calculate the heating duty cycle, use PWM to control the heating power and return to step 8.

[0068] Step 10: Initiate coarse temperature sampling from the backup temperature control link and determine whether the sampled value is greater than the lower limit of the temperature control range. If yes, compare it with the upper limit of the temperature control range; if no, record the number of samplings.

[0069] Step 11: Determine if the number of data collections is less than 10. If yes, start full-power heating and return to step 10; otherwise, read the first and last data collection values ​​for comparison.

[0070] Step 12: Determine if the first and last collected values ​​deviate by 10%. If yes, start full-power heating and return to step 10; if no, mark the backup temperature measurement link as faulty and end temperature control.

[0071] Step 13: When the coarse sampling temperature value is greater than the lower limit of the temperature control range, compare it with the upper limit of the temperature control range: Is it less than the upper limit of the temperature control range? If yes, proceed to the fine sampling process; if no, record the number of samplings.

[0072] Step 14: Determine if the number of data collections is less than 10. If yes, stop heating and return to step 10; otherwise, read the first and last data collection values ​​for comparison.

[0073] Step 15: Determine if the first and last collected values ​​deviate by 10%. If yes, stop heating and return to step 10; if no, mark the backup temperature measurement link as faulty and end temperature control.

[0074] Step 16: After entering the temperature fine sampling stage, determine whether the sampled value is 0.05℃ lower than the target value within the precise temperature control range. If yes, the PID controller will operate at full power and return to step 10; otherwise, further determine the upper limit of the precise range.

[0075] Step 17, Precise temperature control range upper limit judgment: Is it higher than the target value by 0.03℃? If yes, stop heating and return to step 10; if no, substitute the collected value into the PID temperature control algorithm to calculate the heating duty cycle, use PWM to control the heating power and return to step 16.

[0076] Step 18: The final temperature control algorithm will cycle between steps 16 and 17 to achieve dynamic equilibrium.

[0077] This invention's method is based on the traditional temperature control system design architecture, but expands the design structure of the temperature measurement and control application circuits. It employs a multi-stage approximation temperature measurement method, dividing temperature acquisition into coarse and fine sampling temperature segments. Precise temperature measurement is achieved through small-signal amplification, improving measurement resolution. The temperature control method is adjusted to a combination of strategies, including full-power rapid heating, zero-power rapid cooling, and PID smooth frequency conversion micro-oscillation heating, improving temperature control response speed and achieving heating power adjustment accuracy of one-thousandth of a percent. This effectively enhances the temperature control stability of the spaceborne temperature control system, making the high-precision spaceborne temperature control system more widely adaptable and practical. It not only meets the constant temperature control requirements of traditional satellite platform cabins but is also well-suited for the precise constant temperature control needs of temperature-sensitive devices (temperature changes at the level of one-hundredth of a percent).

[0078] Furthermore, the invention adopts a dual-backup redundancy design in both the application circuit and the strategy method, and adds multi-level judgment processing in the strategy, which greatly improves the intelligence, reliability and safety of the spaceborne temperature control system.

Claims

1. A high-precision spaceborne temperature control system, characterized in that, Includes a first temperature measuring circuit and a second temperature measuring circuit; The output terminal of the first temperature measuring circuit is connected to the input terminal of the first amplifier circuit and the input terminal of the acquisition module, respectively; the output terminal of the first amplifier circuit is connected to the input terminal of the acquisition module. The output terminal of the second temperature measuring circuit is connected to the input terminal of the second amplifier circuit and the input terminal of the acquisition module, respectively; the output terminal of the second amplifier circuit is connected to the input terminal of the acquisition module. The output terminal of the acquisition module is connected to the input terminal of the control and processing module. The output terminal of the control and processing module is connected to the input terminals of the first temperature control module and the second temperature control module, respectively. The output terminal of the first temperature control module is connected to the input terminal of the first heating wire module. The output terminal of the second temperature control module is connected to the output terminal of the first heating wire module. The first temperature sensing circuit performs initial data acquisition, obtaining a rough value of the current temperature across the entire temperature range. It then activates the first-stage temperature control mechanism to adjust the temperature of the device under test to the target temperature range. Next, the second stage acquires the precise temperature value through the first amplification circuit. This activates the second-stage temperature control mechanism, which dynamically adjusts the heating duty cycle in real-time using PID control to ensure the temperature of the device under test approximates the target temperature value through smooth, micro-amplitude oscillations, achieving dynamic equilibrium. If the first temperature sensing circuit malfunctions, the control and processing module activates the second temperature sensing circuit for temperature control. The high-precision spaceborne temperature control system is achieved through the following methods: The first temperature measurement circuit performs preliminary data acquisition in the first stage, obtaining a rough value of the current temperature across the entire temperature range, and activating the first-stage temperature control mechanism to adjust the temperature of the device under test to the target temperature range. Then, the second stage acquires data, obtaining a precise value of the current temperature through the first amplification circuit, and activating the second-stage temperature control mechanism. The heating duty cycle is dynamically adjusted in real time using PID control, so that the temperature of the device under test approaches the target temperature value in a smooth, micro-amplitude oscillation manner, achieving dynamic equilibrium. When the first temperature measuring circuit malfunctions, the control and processing module activates the second temperature measuring circuit to control the temperature. Specifically, it includes the following steps: Step 1: The first temperature measurement circuit performs a coarse temperature sampling and judges whether the temperature sampling value is greater than the lower limit of the temperature control range; if it is greater than the lower limit of the temperature control range, it is compared with the upper limit of the temperature control range, and Step 4 is executed; if it is less than the lower limit of the temperature control range, the sampling number is recorded, and Step 2 is executed. Step 2: Determine if the number of data collections in Step 1 is less than the preset number. If it is less than the preset number, start full-power heating and return to Step 1. If the number of attempts exceeds the preset limit, the first and last collected values ​​are read for judgment, and step 3 is executed. Step 3: Determine whether the first and last collected values ​​are within the deviation range. If yes, start full-power heating and return to step 1. If no, mark the first temperature measuring circuit as faulty, and the control and processing module starts the second temperature measuring circuit and executes step 9. Step 4: When the coarse sampling temperature value is greater than the lower limit of the temperature control, compare it with the upper limit of the temperature control range: Is it less than the upper limit of the temperature control range? If yes, proceed to the fine sampling process and execute Step 7; if no, record the number of samplings and execute Step 5. Step 5: Determine if the number of data collections is less than the preset number. If yes, stop heating and return to Step 1; otherwise, read the first and last data collection values ​​for comparison. Step 6: Determine whether the first and last collected values ​​are within the deviation range. If yes, stop heating and return to step 1; if no, mark the first temperature measuring circuit as abnormal, and the control and processing module starts the second temperature measuring circuit and executes step 9. Step 7: After entering the temperature fine sampling stage, determine whether the sampled value is below the deviation range of the temperature control precision range. If so, the PID will heat at full power and return to step 1; if not, further determine the upper limit of the precision range. Step 8, Precise temperature control range upper limit judgment: Is it higher than the deviation range of the target value? If yes, stop heating and return to step 1; if no, substitute the collected value into the PID temperature control algorithm to calculate the heating duty cycle, use PWM to control the heating power and return to step 7. Step 9: The second temperature measurement circuit performs a coarse temperature sampling and judges whether the temperature sampling value is greater than the lower limit of the temperature control range; if it is greater than the lower limit of the temperature control range, it is compared with the upper limit of the temperature control range, and step 12 is executed; if it is less than the lower limit of the temperature control range, the sampling number is recorded, and step 10 is executed. Step 10: Determine if the number of data collections in Step 1 is less than the preset number. If it is less than the preset number, start full-power heating and return to Step 9. If the number of attempts exceeds the preset limit, the first and last collected values ​​are read for judgment, and step 11 is executed. Step 11: Determine whether the first and last collected values ​​are within the deviation range. If yes, start full-power heating and return to step 9; if no, mark the second temperature measurement circuit as abnormal and end temperature control. Step 12: When the coarse sampling temperature value is greater than the lower limit of the temperature control, compare it with the upper limit of the temperature control range: Is it less than the upper limit of the temperature control range? If yes, proceed to the fine sampling process and execute step 15; if no, record the number of samplings and execute step 13. Step 13: Determine if the number of data collections is less than the preset number. If yes, stop heating and return to step 9; otherwise, read the first and last data collection values ​​for comparison. Step 14: Determine whether the first and last collected values ​​are within the deviation range. If yes, stop heating and return to step 9; if no, mark the second temperature measuring circuit as abnormal and end temperature control. Step 15: After entering the temperature fine sampling stage, determine whether the sampled value is below the deviation range of the temperature control precision range. If so, the PID will heat at full power and return to step 9; if not, further determine the upper limit of the precision range. Step 16, Precise temperature control range upper limit judgment: whether it is higher than the deviation range of the target value. If yes, stop heating and return to step 9; if no, substitute the collected value into the PID temperature control algorithm to calculate the heating duty cycle, use PWM to control the heating power and return to step 15.

2. The high-precision spaceborne temperature control system according to claim 1, characterized in that, The interface between the first temperature measuring circuit and the second temperature measuring circuit uses a Wheatstone bridge.

3. The high-precision spaceborne temperature control system according to claim 1, characterized in that, The first temperature measuring circuit and the second temperature measuring circuit have the same structure.

4. The high-precision spaceborne temperature control system according to claim 1, characterized in that, The first temperature measuring circuit includes a first thermistor module, a bridge conversion module, and a signal conditioning module; The output of the first thermistor module is connected to the input of the bridge converter module, the output of the bridge converter module is connected to the input of the signal conditioning module, and the output of the signal conditioning module is connected to the input of the first amplifier circuit and the input of the acquisition module, respectively.

5. A high-precision spaceborne temperature control system according to claim 1, characterized in that, In step 1, before coarse sampling, the control and processing module receives external instructions to update the target temperature value of the temperature control system. If no relevant instructions are received, the default value of 35℃ is maintained.

6. A high-precision spaceborne temperature control system according to claim 1, characterized in that, In step 1, the preset number of data collections is 10.

7. A high-precision spaceborne temperature control system according to claim 1, characterized in that, In step 1, the deviation range between the first and last collected values ​​is 10%.

Images