Control method and system for refrigeration module of closed cavity

Abstract

The invention relates to the technical field of image equipment, and discloses a control method and system for a refrigeration module of a closed cavity, and the method comprises the steps: obtaining the temperature of the refrigeration module, the error of refrigeration module temperature detection equipment, the temperature of a heating end, the temperature of the cavity and the humidity of the cavity in real time; determining a target temperature interval according to the cavity temperature, the cavity humidity, the refrigeration module temperature detection equipment error, the heating end temperature and the cavity temperature; and the working state of the refrigeration module is adjusted according to the refrigeration module temperature and the target temperature interval. By adopting the method and system provided by the invention, the temperature of the refrigeration module can be effectively controlled, the internal temperature of the closed cavity is reduced, the heat emitted by the heating end of the device is released, the condensation phenomenon on the refrigeration module is prevented, and the service life of equipment is prolonged; meanwhile, the working state of the refrigeration module is adjusted by taking the target temperature interval instead of a single temperature point as a reference, and the situation that the service life of the refrigeration module is shortened due to frequent switching on and off of the refrigeration module is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging equipment, and in particular to a control method and system for a refrigeration module in a sealed cavity. Background Art

[0002] LCD (Liquid Crystal Display) projectors are a high-tech product resulting from advances in liquid crystal technology, lighting technology, and integrated circuits. They manipulate the arrangement of liquid crystal molecules to alter light transmittance and reflectivity, producing images with varying grayscale and color. As living standards improve, the application of LCD projectors has gradually expanded, and they are now widely used in both homes and offices.

[0003] To achieve a better viewing experience, LCD projectors use an airtight or non-airtight fully enclosed assembly structure, which can effectively prevent dust from entering the projector and ensure the cleanliness of internal components. However, when the LCD projector is working, its internal electronic components will generate a lot of heat. The airtight closed structure will limit the natural heat dissipation of internal and external gas exchange. After long-term use, the internal temperature of the LCD projector will rise, affecting the performance of the device and accelerating the aging of the device. Although the non-airtight closed structure does not prevent gas exchange, the heat dissipation efficiency is not enough to cope with the heat generated by the electronic components. To solve this problem, it is necessary to integrate a cooling module, such as a semiconductor cooling module, into the LCD projector to maintain a suitable operating temperature and protect the internal components from high temperature damage.

[0004] When the cooling module is working, its surface temperature will be lower than the temperature of the surrounding environment. If water vapor in the surrounding air contacts the surface of the cooling module whose temperature is lower than the dew point, the water vapor will condense into water droplets, forming condensed water. Condensed water will pose a potential threat to electronic components and reduce the service life of the equipment. Therefore, it is necessary to control the working state of the cooling module from the perspective of anti-condensation. However, since the existing anti-condensation control method of the cooling module is relatively simple, it only adopts a relatively basic strategy to manage the temperature. Frequent and rapid switching of the cooling module will shorten the service life of the cooling module. Summary of the Invention

[0005] The present invention provides a control method and system for a refrigeration module in a sealed cavity, which solves the technical problem that the service life of the refrigeration module is shortened due to frequent and rapid switching of the refrigeration module in the sealed cavity.

[0006] A first aspect of the present invention provides a method for controlling a refrigeration module in a sealed cavity, wherein the sealed cavity is provided with the refrigeration module, a device having a heating end, a refrigeration module temperature detection device, a heating end temperature detection device, and an ambient temperature and humidity detection device; the method comprises:

[0007] Real-time acquisition of cooling module temperature, cooling module temperature detection device error, heating end temperature, cavity temperature, and cavity humidity;

[0008] determining a target temperature range according to the cavity temperature, the cavity humidity, an error of a temperature detection device of the refrigeration module, the heating end temperature, and the cavity temperature;

[0009] The operating state of the refrigeration module is adjusted using the refrigeration module temperature and the target temperature range.

[0010] Optionally, determining the target temperature range according to the cavity temperature, the cavity humidity, an error of a temperature detection device of the refrigeration module, the heating end temperature, and the cavity temperature specifically includes:

[0011] Calculating the real-time dew point temperature according to the cavity temperature and the cavity humidity;

[0012] Calculating a current real-time temperature range based on the real-time dew point temperature, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature;

[0013] The current real-time temperature range is used as the new target temperature range.

[0014] Optionally, determining the target temperature range according to the cavity temperature, the cavity humidity, an error of a temperature detection device of the refrigeration module, the heating end temperature, and the cavity temperature specifically includes:

[0015] Get the current target temperature range and the corresponding historical dew point temperature;

[0016] Calculating the real-time dew point temperature according to the cavity temperature and the cavity humidity;

[0017] Calculating a current real-time temperature range based on the real-time dew point temperature, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature;

[0018] If the absolute value of the difference between the historical dew point temperature and the real-time dew point temperature is greater than the error of the refrigeration module temperature detection device, the current real-time temperature range is used as the new target temperature range;

[0019] If the absolute value of the difference between the historical dew point temperature and the real-time dew point temperature is less than or equal to the error of the refrigeration module temperature detection device, the current target temperature range is maintained unchanged.

[0020] Optionally, the real-time temperature range is (T0+T d ,T0+T d +T a), where T0 is the real-time dew point temperature, T d is the temperature detection device error, T a is the difference between the temperature of the heating end and the temperature of the cavity.

[0021] Optionally, the adjusting the working state of the refrigeration module by using the refrigeration module temperature and the target temperature range specifically includes:

[0022] If the temperature of the refrigeration module is not within the target temperature range, determining whether the temperature of the refrigeration module is greater than or equal to the upper limit of the target temperature range or less than or equal to the lower limit of the target temperature range;

[0023] If the temperature of the refrigeration module is greater than or equal to the upper limit of the target temperature range, turning on the refrigeration module;

[0024] If the temperature of the refrigeration module is less than or equal to the lower limit of the target temperature range, the refrigeration module is turned off.

[0025] Optionally, the adjusting the working state of the refrigeration module by using the refrigeration module temperature and the target temperature range further includes:

[0026] If the temperature of the refrigeration module is within the target temperature range, the refrigeration module is turned on and the operating temperature of the refrigeration module is controlled by a PWM control method.

[0027] Optionally, the adjusting the working state of the refrigeration module by using the refrigeration module temperature and the target temperature range specifically includes:

[0028] Using PID algorithm to control the operating temperature of the refrigeration module;

[0029] If the temperature of the refrigeration module is within the target temperature range and the operating time is greater than the preset temperature lock time, the PID parameters of the current PID algorithm are kept unchanged;

[0030] If the temperature of the refrigeration module is not within the target temperature range, the PID parameters of the PID algorithm are adjusted.

[0031] Optionally, the refrigeration module includes a semiconductor refrigerator and fins provided on the semiconductor refrigerator;

[0032] The refrigeration module temperature is the surface temperature of the fins.

[0033] Optionally, the control method further includes:

[0034] Get the operating temperature range of the heating end;

[0035] If the temperature of the heating end is not within the operating temperature range of the heating end, an alarm prompt message is generated.

[0036] A second aspect of the present invention provides a control system for a refrigeration module in a sealed cavity, wherein the refrigeration module, a device having a heating end, a refrigeration module temperature detection device, a heating end temperature detection device, and an ambient temperature and humidity detection device are installed in the sealed cavity; the system comprises:

[0037] The data acquisition module is used to obtain the refrigeration module temperature, the error of the refrigeration module temperature detection device, the heating end temperature, the cavity temperature and the cavity humidity in real time;

[0038] a data processing module, configured to determine a target temperature range based on the cavity temperature, the cavity humidity, an error of a temperature detection device of the refrigeration module, the heating end temperature, and the cavity temperature;

[0039] The state adjustment module is used to adjust the working state of the refrigeration module by using the refrigeration module temperature and the target temperature range.

[0040] It can be seen from the above technical solutions that the present invention has the following advantages:

[0041] The present invention provides a method and system for controlling a refrigeration module in a sealed cavity, wherein the method includes: obtaining the refrigeration module temperature, the error of the refrigeration module temperature detection device, the heating end temperature, the cavity temperature, and the cavity humidity in real time; determining a target temperature range based on the cavity temperature, cavity humidity, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature; and adjusting the operating state of the refrigeration module using the refrigeration module temperature and the target temperature range. The method and system provided by the present invention can effectively control the temperature of the refrigeration module, lower the temperature inside the sealed cavity, release heat dissipated by the heating end of the device, and prevent condensation on the refrigeration module, thereby increasing the operating life of the device. At the same time, adjusting the operating state of the refrigeration module based on the target temperature range rather than a single temperature point avoids the situation where the refrigeration module is frequently turned on and off and thus shortens its life. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A flowchart of a method for controlling a refrigeration module in a sealed cavity provided by an embodiment of the present invention;

[0044] Figure 2 A flow chart of a method for controlling a refrigeration module in a sealed cavity provided by an embodiment of the present invention;

[0045] Figure 3 A flow chart of a method for controlling a refrigeration module in a sealed cavity provided by an embodiment of the present invention;

[0046] Figure 4 A flow chart of a method for controlling a refrigeration module in a sealed cavity provided by an embodiment of the present invention;

[0047] Figure 5 A flow chart of a method for controlling a refrigeration module in a sealed cavity provided by an embodiment of the present invention;

[0048] Figure 6 A flow chart of a method for controlling a refrigeration module in a sealed cavity provided by an embodiment of the present invention;

[0049] Figure 7 This is a structural block diagram of a control system for a refrigeration module in a sealed cavity provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The embodiments of the present invention provide a control method and system for a refrigeration module in a sealed cavity, which are used to solve the technical problem that the service life of the refrigeration module is shortened due to frequent and rapid opening and closing of the refrigeration module in the sealed cavity.

[0051] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0052] See also Figure 1 , Embodiment 1 of the present invention provides a control method for a refrigeration module in a sealed cavity, wherein the sealed cavity is equipped with a refrigeration module, a device having a heating end, a refrigeration module temperature detection device, a heating end temperature detection device, and an ambient temperature and humidity detection device;

[0053] The method provided in this embodiment includes the following steps 11 to 13:

[0054] Step 11: Acquire the refrigeration module temperature, the refrigeration module temperature detection device error, the heating end temperature, the cavity temperature, and the cavity humidity in real time.

[0055] It should be noted that the temperature of the refrigeration module is collected by the refrigeration module temperature detection device. The error of the refrigeration module temperature detection device refers to the difference between the actual temperature and the temperature measured by the refrigeration module temperature detection device, which can be obtained through regular calibration of the refrigeration module temperature detection device by technicians; the refrigeration device in the refrigeration module can adopt compressor refrigeration equipment, semiconductor refrigerator, etc. The selection of the refrigeration module for dissipating heat for the LCD projector needs to consider its compact design, efficient heat dissipation requirements, and noise and reliability requirements. Therefore, a semiconductor refrigerator is preferably used; in a specific embodiment, the refrigeration module includes a semiconductor refrigerator and fins arranged on the semiconductor refrigerator, and the refrigeration module temperature detection device is installed on the surface of the fin, and the collected refrigeration module temperature is the surface temperature of the fin; in this specific embodiment, a cooling fan and an air duct passing through the refrigeration module and the heating end can also be installed in the enclosed space to achieve efficient heat dissipation. At this time, under the high heat dissipation efficiency provided by the fan and the fins, the cavity temperature and the temperature of the heating end (the power of the heating end is within 15W) will not differ by more than 5°C.

[0056] The heating end temperature is collected by the heating end temperature detection device, which is set at the heating point (i.e., the heating end) of the device in the enclosed space; the cavity temperature and cavity humidity, i.e., the ambient temperature and humidity in the enclosed cavity, are collected by the ambient temperature and humidity detection device.

[0057] Step 12: Determine the target temperature range based on the cavity temperature, cavity humidity, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature.

[0058] In a specific implementation of this embodiment, step 12 includes the following sub-steps 121 to 123:

[0059] Step 121: Calculate the real-time dew point temperature according to the cavity temperature and cavity humidity.

[0060] The real-time dew point temperature is the dew point temperature in the current closed cavity; the calculation formula of the real-time dew point temperature T0 is:

[0061]

[0062]

[0063] Where, the real-time dew point temperature T0 and the cavity temperature T are in degrees Celsius (°C); the cavity humidity RH is the relative humidity in percentage; a and b are constants.

[0064] Step 122: Calculate the current real-time temperature range based on the real-time dew point temperature, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature.

[0065] In the present invention, the real-time temperature range is (T0+Td ,T0+T d +T a ), where T0 is the real-time dew point temperature, T d is the temperature detection equipment error, T a is the difference between the heating end temperature and the cavity temperature T.

[0066] Step 123: Use the current real-time temperature range as the new target temperature range.

[0067] It is understandable that in this specific embodiment, the operating state of the refrigeration module is adjusted based on a temperature range rather than a single temperature point, which can avoid the situation where the life of the refrigeration module is shortened due to frequent switching of the refrigeration module.

[0068] See Figure 2 In another specific implementation of this embodiment, step 12 includes the following sub-steps 124 to 128:

[0069] Step 124: Obtain the current target temperature range and the corresponding historical dew point temperature T1.

[0070] In this step, the historical dew point temperature refers to the dew point temperature value used in the calculation of the current target temperature range.

[0071] Step 125 : Calculate the real-time dew point temperature T0 according to the cavity temperature and cavity humidity; the calculation formula for the real-time dew point temperature is the same as that in step 121 .

[0072] Step 126: Detect device error T according to real-time dew point temperature T0 and refrigeration module temperature. d , the heating end temperature and the cavity temperature are used to calculate the current real-time temperature range; the calculation method of the real-time temperature range is the same as step 122.

[0073] Step 127: If the absolute value of the difference between the historical dew point temperature T1 and the real-time dew point temperature T0 is greater than the error T of the refrigeration module temperature detection device, d , the current real-time temperature range is used as the new target temperature range.

[0074] Step 128: If the absolute value of the difference between the historical dew point temperature and the real-time dew point temperature is less than or equal to the error of the refrigeration module temperature detection device, the current target temperature range is maintained unchanged.

[0075] This specific embodiment can avoid frequent changes in the target temperature range, which results in the refrigeration module being frequently turned on and off when the temperature of the refrigeration module is near the upper limit or lower limit of the range.

[0076] Step 13: Using the refrigeration module temperature and the target temperature range, adjust the working state of the refrigeration module.

[0077] It should be noted that the above steps 11 to 13 can be executed in a loop after a preset time interval to adapt to the constantly changing temperature and humidity conditions in the closed cavity, improve the accuracy of control, and reduce the risk of condensation water; the preset time is preferably 1 minute to 2 hours, which can be selected according to the temperature changes of the surrounding environment in which the closed cavity is located; when the surrounding environment is good, after the refrigeration module runs stably, the temperature and humidity in the closed cavity will not change significantly, and the dew point temperature in the closed cavity will not fluctuate much; in an airtight closed cavity, the changes in temperature and humidity are regular, and the dew point temperature is also stable.

[0078] See also Figure 4 In a specific implementation of this embodiment, step 13 includes the following sub-steps 131 to 133:

[0079] Step 131: If the refrigeration module temperature is not within the target temperature range, determine whether the refrigeration module temperature is greater than or equal to the upper limit of the target temperature range or less than or equal to the lower limit of the target temperature range.

[0080] Step 132: If the temperature of the cooling module is greater than or equal to the upper limit of the target temperature range, the cooling module is turned on.

[0081] It should be noted that, in this step, turning on the refrigeration module means turning on the refrigeration module and allowing it to output full power, that is, the refrigeration module operates at the maximum power level allowed by its design.

[0082] Step 133: If the temperature of the refrigeration module is less than or equal to the lower limit of the target temperature range, turn off the refrigeration module.

[0083] Further, in one aspect, see Figure 4 In the flowchart, step 13 may further include:

[0084] Step 134: If the temperature of the refrigeration module is within the target temperature range, the current working state of the refrigeration module is maintained.

[0085] In this step, the working state of the cooling module refers to the power-off state or the power-on state of the full-open output.

[0086] On the other hand, see Figure 5 In the flowchart, step 13 may further include:

[0087] Step 135: If the temperature of the refrigeration module is within the target temperature range, the refrigeration module is turned on and the operating temperature of the refrigeration module is controlled using a PWM control method.

[0088] It can be understood that the PWM control method adjusts the output power of the cooling module by increasing or decreasing the duty cycle of the PWM signal; when the temperature of the cooling module is within the target temperature range, the duty cycle of the PWM signal can be reduced to enable the cooling module to operate at a lower power, reduce energy consumption and maintain a relatively stable temperature.

[0089] In another specific implementation of this embodiment, please refer to Figure 6 Flowchart, step 13 specifically includes the following sub-steps 135 to 137:

[0090] Step 135: Use a PID algorithm to control the operating temperature of the refrigeration module.

[0091] Specifically, the PID parameters may be adjusted according to the calculation results of the PID algorithm to change the magnitude and direction of the current or voltage applied to the refrigeration module.

[0092] Step 136: If the refrigeration module temperature is within the target temperature range and the operating time is T r If the temperature is greater than the preset temperature lock time, the PID parameters of the current PID algorithm will remain unchanged.

[0093] The operating time refers to the length of time the cooling module maintains operation within the target temperature range under the same PID parameters after being turned on. The preset temperature lock time, Times, is a constant determined by factors such as the environment, cooling module efficiency, and cooling module type, and can be determined through testing. Optimal PID parameters are obtained when the operating time during which the cooling module reaches and maintains the target temperature range is greater than the preset temperature lock time.

[0094] Step 137: If the temperature of the cooling module is not within the target temperature range, adjust the PID parameters of the PID algorithm.

[0095] See also Figure 3 、 4 , 5 or 6, in a preferred embodiment, the control method provided in this embodiment further includes:

[0096] Step 14: Obtain the operating temperature range of the heating end.

[0097] Step 15: If the temperature of the heating end is not within the operating temperature range of the heating end, the operating state of the refrigeration module is determined to be abnormal, a warning identifier is marked, and an alarm prompt message is generated; the alarm prompt message can be sent to the peripheral system of the closed cavity for recording, processing and display.

[0098] Step 16: If the temperature of the heating end is within the heating end operating temperature range, the operating state of the cooling module is determined to be normal, a normal operating identifier is marked, and subsequent operations are performed normally.

[0099] In another preferred embodiment, a signal conversion module is further installed in the sealed cavity, and the signal conversion module is provided with a signal conversion interface connected to the refrigeration module temperature detection device, the heating end temperature detection device and the ambient temperature and humidity detection device respectively; Figure 3 , the control method provided in this embodiment also includes:

[0100] Step 17: Get the working status of the signal conversion interface.

[0101] In this preferred embodiment, the signal conversion interface refers to any device or component used to convert between different types of signals (such as analog signals, digital signals, serial signals, parallel signals, etc.), including but not limited to ADCs, DACs (digital-to-analog converters), protocol converters, level converters, etc.; the working state of the signal conversion interface includes normal working state and abnormal working states such as fault state, initialization state, and diagnostic state. The signal conversion interface will have corresponding current reduction or other measurable changes in different working states; if the signal conversion interface is in an abnormal working state, the obtained temperature and humidity data may be inaccurate.

[0102] Step 18: If the working state of the signal conversion interface is abnormal, the working state of the refrigeration module is determined to be abnormal, a warning identifier is marked, and an alarm prompt message is generated.

[0103] Step 19: If the working state of the signal conversion interface is normal, the working state of the cooling module is determined to be normal, a normal working identifier is marked, and subsequent operations are performed normally.

[0104] A second aspect of the present invention provides a control system for a refrigeration module in a sealed cavity, wherein the sealed cavity is equipped with a refrigeration module, a device having a heating end, a refrigeration module temperature detection device, a heating end temperature detection device, and an ambient temperature and humidity detection device; the system comprises:

[0105] The data acquisition module 21 is used to obtain the refrigeration module temperature, the error of the refrigeration module temperature detection device, the heating end temperature, the cavity temperature and the cavity humidity in real time;

[0106] The data processing module 22 is used to determine the target temperature range based on the cavity temperature, cavity humidity, the error of the refrigeration module temperature detection device, the heating end temperature and the cavity temperature;

[0107] The state adjustment module 23 is used to adjust the working state of the refrigeration module by using the refrigeration module temperature and the target temperature range.

[0108] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0109] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0110] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0111] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0112] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0113] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling a refrigeration module in a closed cavity, characterized in that: The refrigeration module, a device with a heating end, a refrigeration module temperature detection device, a heating end temperature detection device, and an ambient temperature and humidity detection device are installed in the sealed cavity; the method includes: Real-time acquisition of cooling module temperature, cooling module temperature detection device error, heating end temperature, cavity temperature, and cavity humidity; determining a target temperature range according to the cavity temperature, the cavity humidity, an error of a temperature detection device of the refrigeration module, the heating end temperature, and the cavity temperature; The operating state of the refrigeration module is adjusted using the refrigeration module temperature and the target temperature range.

2. The control method according to claim 1, characterized in that: The determining of the target temperature range according to the cavity temperature, the cavity humidity, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature specifically includes: Calculating the real-time dew point temperature according to the cavity temperature and the cavity humidity; Calculating a current real-time temperature range based on the real-time dew point temperature, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature; The current real-time temperature range is used as the new target temperature range.

3. The control method according to claim 1, wherein: The determining of the target temperature range according to the cavity temperature, the cavity humidity, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature specifically includes: Get the current target temperature range and the corresponding historical dew point temperature; Calculating the real-time dew point temperature according to the cavity temperature and the cavity humidity; Calculating a current real-time temperature range based on the real-time dew point temperature, the error of the refrigeration module temperature detection device, the heating end temperature, and the cavity temperature; If the absolute value of the difference between the historical dew point temperature and the real-time dew point temperature is greater than the error of the refrigeration module temperature detection device, the current real-time temperature range is used as the new target temperature range; If the absolute value of the difference between the historical dew point temperature and the real-time dew point temperature is less than or equal to the error of the refrigeration module temperature detection device, the current target temperature range is maintained unchanged.

4. The control method according to claim 1, wherein: The real-time temperature range is (T0+T d ,T0+T d +T a ), where T0 is the real-time dew point temperature, T d is the temperature detection device error, T a is the difference between the temperature of the heating end and the temperature of the cavity.

5. The control method according to claim 1, characterized in that: The step of adjusting the operating state of the refrigeration module by using the refrigeration module temperature and the target temperature range specifically includes: If the temperature of the refrigeration module is not within the target temperature range, determining whether the temperature of the refrigeration module is greater than or equal to the upper limit of the target temperature range or less than or equal to the lower limit of the target temperature range; If the temperature of the refrigeration module is greater than or equal to the upper limit of the target temperature range, turning on the refrigeration module; If the temperature of the refrigeration module is less than or equal to the lower limit of the target temperature range, the refrigeration module is turned off.

6. The control method according to claim 5, characterized in that: The adjusting the working state of the refrigeration module by using the refrigeration module temperature and the target temperature range further includes: If the temperature of the refrigeration module is within the target temperature range, the refrigeration module is turned on and the operating temperature of the refrigeration module is controlled by a PWM control method.

7. The control method according to claim 1, characterized in that: The step of adjusting the operating state of the refrigeration module by using the refrigeration module temperature and the target temperature range specifically includes: Using PID algorithm to control the operating temperature of the refrigeration module; If the temperature of the refrigeration module is within the target temperature range and the operating time is greater than the preset temperature lock time, the PID parameters of the current PID algorithm are kept unchanged; If the temperature of the refrigeration module is not within the target temperature range, the PID parameters of the PID algorithm are adjusted.

8. The control method according to claim 1, characterized in that: The refrigeration module includes a semiconductor refrigerator and fins arranged on the semiconductor refrigerator; The refrigeration module temperature is the surface temperature of the fins.

9. The control method according to claim 1, characterized in that: Also includes: Get the operating temperature range of the heating end; If the temperature of the heating end is not within the operating temperature range of the heating end, an alarm prompt message is generated.

10. A control system for a refrigeration module in a closed cavity, characterized in that: The refrigeration module, a device with a heating end, a refrigeration module temperature detection device, a heating end temperature detection device, and an ambient temperature and humidity detection device are installed in the sealed cavity; the system includes: The data acquisition module is used to obtain the refrigeration module temperature, the error of the refrigeration module temperature detection device, the heating end temperature, the cavity temperature and the cavity humidity in real time; a data processing module, configured to determine a target temperature range based on the cavity temperature, the cavity humidity, an error of a temperature detection device of the refrigeration module, the heating end temperature, and the cavity temperature; The state adjustment module is used to adjust the working state of the refrigeration module by using the refrigeration module temperature and the target temperature range.

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