Rotatable infrared sensor, application method thereof and air conditioning unit

Abstract

The invention discloses a rotatable infrared sensor, an application method of the rotatable infrared sensor and an air conditioning unit. The rotatable infrared sensor comprises an infrared sensor body and a stepping motor installed at the bottom of the infrared sensor body. The application method of the rotatable infrared sensor comprises the following steps: setting a preset rotation angle for the stepping motor according to the position of a to-be-detected device, and enabling the infrared sensor to detect one to-be-detected device at each preset rotation angle; controlling the stepping motor to move and pass through all preset rotation angles, enabling the stepping motor to stop for a first preset time when the stepping motor is at each preset angle, and enabling an infrared sensor to carry out the temperature detection of the to-be-detected device within the first preset time; and according to the detection result of the infrared sensor, adjusting or maintaining the working state of the to-be-detected device. Compared with the prior art, one infrared sensor can be used for detecting the temperature of the to-be-detected devices at different positions, and the number of used infrared sensors is reduced.

Description

Technical Field

[0001] The invention relates to the field of temperature control, in particular to a rotatable infrared sensor and an application method thereof, and an air conditioning unit. Background Art

[0002] There are many infrared sensors needed on the controller, including those for measuring ambient temperature, box temperature, component temperature, etc. For example, the controller generally has requirements for the surface temperature rise of components, but the current controller cannot detect the temperature rise of key components, so it cannot perform fault judgment and corresponding processing, which may cause component damage.

[0003] In addition, the detection of the temperature rise on the surface of components can also indirectly feedback the loss of the controller, but our control currently does not use this data. Another example is the ambient temperature detection, which is usually done by installing an NTC resistor on the controller or a sensor at a certain position, which may cause the problem of different temperature intervals.

[0004] To achieve the above functions, the existing technology needs to add multiple infrared sensors, which will increase the design cost. Therefore, how to realize the temperature detection of multiple components through one infrared sensor is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0005] In view of the problem in the prior art that multiple infrared sensors need to be added to detect the temperature of components, which increases the design cost, the present invention proposes a rotatable infrared sensor and an application method thereof, and an air conditioning unit.

[0006] The technical solution of the present invention is to propose an application method of a rotatable infrared sensor, wherein the rotatable infrared sensor comprises an infrared sensor and a stepping motor installed at the bottom of the infrared sensor, and is characterized in that the application method of the rotatable infrared sensor comprises:

[0007] Setting a preset rotation angle for the stepper motor according to the position of the device under test, and making the infrared sensor detect a device under test at each preset rotation angle;

[0008] Controlling the stepper motor to move and pass through all preset rotation angles, and stopping the stepper motor for a first preset time at each preset angle, and the infrared sensor performs temperature detection for the device under test within the first preset time;

[0009] According to the detection result of the infrared sensor, the working state of the device under test is adjusted or maintained.

[0010] Furthermore, the device under test includes: an IGBT module of an air-conditioning controller, and a switching power supply IC module;

[0011] The stepper motor is provided with a first rotation angle and a second rotation angle. At the first rotation angle, the infrared sensor performs temperature detection for the IGBT module, and at the second rotation angle, the infrared sensor performs temperature detection for the switching power supply IC module.

[0012] Further, when the stepper motor rotates to the first rotation angle, adjusting or maintaining the working state of the device under test according to the detection result of the infrared sensor includes:

[0013] Determining whether the temperature of the IGBT module exceeds a first preset temperature;

[0014] If yes, the compressor is controlled to stop for a second preset time, an IGBT module fault is reported, and after the second preset time, when the temperature of the IGBT module is lower than a fourth preset temperature, the fault is determined to be cleared and the compressor is restarted;

[0015] If not, determining whether the temperature of the IGBT module exceeds a second preset temperature;

[0016] When the determination is yes, performing frequency reduction processing for the compressor;

[0017] Wherein, the first preset temperature is higher than the second preset temperature.

[0018] Further, when the stepper motor rotates to the second rotation angle, adjusting or maintaining the working state of the device under test according to the detection result of the infrared sensor includes:

[0019] Determining whether the temperature of the switching power supply IC module exceeds a third preset temperature;

[0020] When the determination is yes, all loads are turned off for a third preset time, a fault of the switching power IC module is reported, and after the third preset time, when the temperature of the switching power IC module is lower than a fifth preset temperature, the fault is determined to be cleared and the load is restarted.

[0021] Furthermore, the application method of the rotatable infrared sensor also includes:

[0022] Setting a plurality of preset rotation angles for the stepper motor, and all the preset rotation angles are evenly distributed according to the circumference of the stepper motor;

[0023] Controlling the stepper motor to move and pass through all preset rotation angles, and stopping the stepper motor for a first preset time at each preset angle, wherein the infrared sensor detects the current ambient temperature at the current preset rotation angle within the first preset time;

[0024] The ambient temperature of the device under test is determined according to the current ambient temperature detected at all preset rotation angles.

[0025] Furthermore, the stepper motor is provided with a third rotation angle, a fourth rotation angle, and a fifth rotation angle, and at the third rotation angle, the current ambient temperature detected by the infrared sensor is the first ambient temperature, at the fourth rotation angle, the current ambient temperature detected by the infrared sensor is the second ambient temperature, and at the fifth rotation angle, the current ambient temperature detected by the infrared sensor is the third ambient temperature.

[0026] Further, determining the ambient temperature of the device under test according to the current ambient temperature detected at all preset rotation angles includes:

[0027] Calculate the difference between any two current ambient temperatures, and determine whether the difference is less than a preset threshold;

[0028] When it is determined that all the differences are less than the preset threshold, calculating an average value of all the current ambient temperatures, and taking the average value as the ambient temperature of the device under test;

[0029] When there is a difference greater than the preset threshold, the current ambient temperature at all preset rotation angles is re-detected, and after multiple detections, the infrared sensor is reported to be faulty.

[0030] Furthermore, the application method of the rotatable infrared sensor also includes:

[0031] Controlling the compressor to run a start-stop cycle at each gear position, and obtaining the sum of the temperatures of all the components to be tested during the start-stop cycle at each gear position, as well as the total operating power of the compressor;

[0032] Obtaining a first gear position corresponding to when the sum of the temperatures of all the devices to be tested is minimum, and a second gear position corresponding to when the total operating power of the compressor is minimum;

[0033] The compressor is controlled to operate in a first gear or a second gear.

[0034] Furthermore, the first preset time is 2 seconds, the second preset time and the third preset time are 10 minutes;

[0035] The first preset temperature is 95 degrees, the second preset temperature is 80 degrees, the third preset temperature is 87 degrees, and the fourth preset temperature and the fifth preset temperature are 80 degrees.

[0036] The present invention also proposes a rotatable infrared sensor using the above application method, which comprises an infrared sensor and a stepper motor installed at the bottom of the infrared sensor, wherein the stepper motor drives the infrared sensor to rotate and performs temperature detection on the device to be tested;

[0037] The present invention also provides an air conditioning unit, which comprises the rotatable infrared sensor.

[0038] Compared with the prior art, the present invention has at least the following beneficial effects:

[0039] 1. The present invention is provided with a stepping motor at the bottom of the infrared sensor, so that the infrared sensor can rotate to detect the temperature of the device under test at different positions. That is, the present invention can use one infrared sensor to detect the temperature of the devices under test at multiple different positions, thereby reducing the use cost of the infrared sensor;

[0040] 2. The present invention performs temperature detection on each device under test and performs different processing on different devices under test, so that the air-conditioning controller can be repaired according to the fault problems of different devices under test, thereby increasing the reliability of the air-conditioning controller;

[0041] 3. The present invention is provided with multiple preset rotation angles to detect the ambient temperature, thereby realizing multi-dimensional ambient temperature detection and ensuring the accuracy of ambient temperature detection;

[0042] 4. The present invention can determine the best gear by obtaining the total operating power of the compressor at each gear and the sum of the temperatures of the device to be tested, so that the compressor can select the most energy-saving operating gear to work in a stable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0044] Figure 1 This is a control flow chart of the present invention in which the temperature of each device to be tested is detected by a rotatable infrared sensor;

[0045] Figure 2 This is a control flow chart of the multi-dimensional detection of ambient temperature by a rotatable infrared sensor in the present invention;

[0046] Figure 3 A control flow chart for determining the optimal gear operation of the compressor according to the present invention. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0049] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0050] In the prior art, in order to realize temperature detection of multiple different devices, it is often necessary to set up multiple infrared sensors, which will increase the design cost.

[0051] In view of the above problems, the idea of ​​the present invention is to propose a rotatable infrared sensor, which is driven by a stepper motor to rotate, so as to realize the use of one infrared sensor to detect the temperature of devices at different positions, thereby saving the use of infrared sensors and reducing design costs.

[0052] Based on the above ideas, the present invention proposes an application method of a rotatable infrared sensor, wherein the rotatable infrared sensor includes an infrared sensor and a stepping motor installed at the bottom of the infrared sensor, and the stepping motor can drive the infrared sensor to move;

[0053] The application method of the above rotatable infrared sensor includes:

[0054] Setting a preset rotation angle for the stepper motor according to the position of the device under test, and making the infrared sensor detect a device under test at each preset rotation angle;

[0055] Controlling the stepper motor to move and pass through all preset rotation angles, and stopping the stepper motor for a first preset time at each preset angle, and the infrared sensor performs temperature detection for the device under test within the first preset time;

[0056] According to the detection result of the infrared sensor, the working state of the device under test is adjusted or maintained.

[0057] In practical applications, there are often multiple devices under test. To detect the temperature of the devices under test using an infrared sensor, the infrared sensor needs to be aimed at the devices under test. The present invention uses a stepper motor to drive the infrared sensor to rotate, thereby realizing this function, so as to achieve the purpose of using one infrared sensor to detect the temperature of multiple devices under test.

[0058] In the present invention, a stepper motor is first used to set a preset rotation angle, so that each preset rotation angle corresponds to a device under test. In this way, when executing control, it is only necessary to adjust the rotation angle of the stepper motor according to the device under test to be detected, which is more convenient to operate.

[0059] In the above control process, when the stepper motor moves and passes through all preset rotation angles, it is necessary to stop at the preset angle for the first preset time, which is used to give the infrared sensor time for temperature detection to avoid the stepper motor rotating too fast and the infrared sensor detecting misjudgment.

[0060] In a specific embodiment of the present invention, the first preset time is set to 2 seconds;

[0061] After obtaining the temperature of the device under test, the state of the device under test, whether it is faulty or working normally, etc., can be determined based on the temperature, and then the working state of the device under test can be adjusted or maintained based on the determined result.

[0062] It can be seen from the above process that compared with the prior art, the present invention is provided with a stepper motor at the bottom of the infrared sensor, so that the infrared sensor can rotate to realize temperature detection of the devices to be tested at different positions. That is, in the present invention, one infrared sensor can be used to realize temperature detection of devices to be tested at multiple different positions, thereby reducing the use cost of the infrared sensor.

[0063] Specifically, the device under test in the present invention includes: an IGBT module of an air conditioner controller, and a switching power supply IC module;

[0064] Correspondingly, the stepper motor in the present invention is provided with a first rotation angle and a second rotation angle. At the first rotation angle, the infrared sensor performs temperature detection for the IGBT module, and at the second rotation angle, the infrared sensor performs temperature detection for the switching power supply IC module.

[0065] The method for detecting the temperature of the IGBT module and executing the corresponding adjustment process is as follows:

[0066] When the stepper motor rotates to the first rotation angle, the infrared sensor detects the temperature of the IGBT module and then determines whether the temperature of the IGBT module exceeds the first preset temperature;

[0067] If yes, the compressor is controlled to stop for a second preset time, an IGBT module fault is reported, and after the second preset time, when the temperature of the IGBT module is lower than a fourth preset temperature, the fault is determined to be cleared and the compressor is restarted;

[0068] If not, continue to determine whether the temperature of the IGBT module exceeds the second preset temperature;

[0069] When the determination is yes, a frequency reduction process is performed for the compressor;

[0070] Here, the first preset temperature is higher than the second preset temperature.

[0071] The method for detecting the temperature of the switching power supply IC module and executing the corresponding adjustment process is as follows:

[0072] When the stepper motor rotates to the second rotation angle, the infrared sensor detects the temperature of the switching power IC module, and then determines whether the temperature of the switching power IC module exceeds a third preset temperature;

[0073] When the determination is yes, all loads are turned off for the third preset time, a switch power IC module fault is reported, and after the third preset time, when the temperature of the switch power IC module is lower than the fifth preset temperature, the fault is determined to be cleared and the load is restarted.

[0074] See also Figure 1 , which is the control flow chart for temperature detection of the IGBT module and the switching power supply IC module, wherein position A corresponds to the first rotation angle, position B corresponds to the second rotation angle, the preset temperature T1 is the first preset temperature, the preset temperature T2 is the second preset temperature, the preset temperature T3 is the third preset temperature, the preset temperature T4 is the fourth preset temperature, and the preset temperature T5 is the fifth preset temperature;

[0075] Time t1 is a first preset time, time t2 is a second preset time, and time t3 is a third preset time;

[0076] The first preset time is 2 seconds, the second preset time is 10 minutes, and the third preset time is 10 minutes.

[0077] The first preset temperature is 95 degrees, the second preset temperature is 80 degrees, the third preset temperature is 87 degrees, and the fourth preset temperature and the fifth preset temperature are 80 degrees.

[0078] According to the above flow chart, the control process of temperature detection of the IGBT module and the switching power supply IC module in the present invention includes:

[0079] Step 1: Power on the controller, and the stepper motor drives the infrared sensor to rotate to form a rotatable infrared sensor. The rotatable infrared sensor is reset first to find the 0 degree angle position. After the 0 degree position is determined, proceed to step 2;

[0080] Step 2: The infrared sensor can be rotated to position A, where the temperature of the IGBT module is detected. The sensor stays at position A for t1 = 2 seconds. During this 2-second period, step 3 is performed. If the 2-second period has expired, step 5 is performed.

[0081] Step 3: Determine whether the temperature at position A exceeds the preset temperature T1, where T1=95 degrees. If so, the compressor stops for t2 time, t2=10 minutes, and reports an IGBT module overtemperature fault. After t2 time, if the temperature drops to the preset temperature T4, where T4=80 degrees, clear the fault and restart the compressor, and re-test; if the temperature at position A does not exceed the preset temperature T1, then proceed to step 4;

[0082] Step 4: Determine whether the temperature at position A exceeds the preset temperature T2, where T2 = 80 degrees. If so, perform frequency reduction according to the established compressor frequency reduction rule. Here, if the current speed is higher than 3000rpm, it will be reduced to 3000rpm. If the current speed is greater than 2580rpm, it will be reduced to 2580rpm. Check every 3 minutes to see if frequency reduction is required. If not, return to step 2 for execution.

[0083] Step 5: The infrared sensor can be rotated to position B. Position B detects the temperature of the switch source IC module and stays at this position for t1=2 seconds. During this 2-second period, execute step 6. If it exceeds 2 seconds, return to step 2.

[0084] Step 6: Determine whether the temperature at position B exceeds the preset temperature T3, where T3 = 87 degrees. If yes, proceed to step 7. If no, return to step 5.

[0085] Step 7: Turn off all loads for t3 time, where t3 = 10 minutes, and report a high temperature fault of the switching power supply IC module. After t3 time, if the temperature returns to below T5 temperature, where T5 = 80 degrees, clear the fault, allow the load to be turned on again, and re-test.

[0086] It can be seen that the present invention performs temperature detection on each device under test through the above scheme, and performs different processing on different devices under test, which can adapt to the fault problems of different devices under test to repair the air-conditioning controller, thereby increasing the reliability of the air-conditioning controller.

[0087] Furthermore, the present invention can also use the above-mentioned rotatable infrared sensor to detect the ambient temperature. When used to detect the ambient temperature, the application method of the rotatable infrared sensor also includes:

[0088] A plurality of preset rotation angles are set for the stepper motor, and all the preset rotation angles are evenly distributed according to the circumference of the stepper motor;

[0089] Controlling the stepper motor to move and pass through all preset rotation angles, and stopping the stepper motor for a first preset time at each preset angle, and the infrared sensor detecting the current ambient temperature at the current preset rotation angle within the first preset time;

[0090] The ambient temperature of the device under test is determined according to the current ambient temperature detected at all preset rotation angles.

[0091] Specifically, the present invention is provided with a third rotation angle, a fourth rotation angle, and a fifth rotation angle, and the current ambient temperature detected by the infrared sensor at the third rotation angle is the first ambient temperature, the current ambient temperature detected by the infrared sensor at the fourth rotation angle is the second ambient temperature, and the current ambient temperature detected by the infrared sensor at the fifth rotation angle is the third ambient temperature;

[0092] The above-mentioned determining the ambient temperature of the device under test according to the current ambient temperature detected at all preset rotation angles includes:

[0093] Calculate the difference between any two current ambient temperatures and determine whether the difference is less than a preset threshold;

[0094] When it is determined that all the differences are less than the preset threshold, the average value of all current ambient temperatures is calculated, and the average value is used as the ambient temperature of the device under test;

[0095] When there is a difference greater than a preset threshold, the current ambient temperature at all preset rotation angles is re-detected, and an infrared sensor failure is reported after multiple detections.

[0096] See also Figure 2 , which is a control flow chart of multi-dimensional detection of ambient temperature by a rotatable infrared sensor in the present invention, wherein position 1 corresponds to the third rotation angle, position 2 corresponds to the fourth rotation angle, and position 3 corresponds to the fifth rotation angle;

[0097] t1 is the first preset time;

[0098] The preset threshold is set to 1 degree;

[0099] According to the above flow chart, the control process of using the rotatable infrared sensor to detect the ambient temperature in the present invention includes:

[0100] Step 1: Power on the controller, and the stepper motor drives the infrared sensor to rotate to form a rotatable infrared sensor. The rotatable infrared sensor is reset first to find the 0 degree angle position. After the 0 degree position is determined, proceed to step 2;

[0101] Step 2: The infrared sensor moves to position 1 and detects position 1, t1 = 2 seconds. After the 2-second detection time of position 1 is up, proceed to step 3;

[0102] Step 3: The infrared sensor moves to position 2 and detects position 2, t=2 seconds. After the 2-second detection time of position 2 is up, proceed to step 4;

[0103] Step 4: The infrared sensor moves to position 3 and detects position 3, t=2 seconds. After the 2-second detection time of position 3 is up, proceed to step 5;

[0104] Step 5: Determine whether the difference between the temperatures detected at position 1, position 2, and position 3 is less than a preset threshold. If so, the ambient temperature is the average of the sum of the temperatures at these three positions, and then return to step 1; if not, execute step 6;

[0105] Step 6: If the difference is large, discard the test and return to step 1.

[0106] It can be seen that the present invention detects the ambient temperature through the above scheme, realizes multi-dimensional ambient temperature detection, and ensures the accuracy of ambient temperature detection.

[0107] Furthermore, the present invention can also be used to obtain the optimal gear position of the compressor operation. In this case, the application method of the rotatable infrared sensor also includes:

[0108] Control the compressor to run a start-stop cycle at each gear position, and obtain the sum of the temperatures of all devices under test during the start-stop cycle at each gear position, as well as the total operating power of the compressor;

[0109] Obtaining the first gear position corresponding to when the sum of the temperatures of all the devices under test is minimum, and the second gear position corresponding to when the total operating power of the compressor is minimum;

[0110] Control the compressor to run in the first gear or the second gear.

[0111] Here, both the first gear and the second gear can be used as the best gear, and need to be selected according to time requirements.

[0112] See also Figure 3 , which is a control flow chart for determining the optimal gear position of the compressor in the present invention, and includes the steps of:

[0113] Step 1: First, run the compressor in accordance with the default requirements. After reaching two consecutive stable start-stop cycles, count the total operating power of the compressor and the total temperature of each key component in the current start-stop cycle, and then execute step 2;

[0114] The key components here can be voltage regulator modules, voltage regulator tubes, switching power supply IC modules, IPM modules, PFC modules, IGBT modules, rectifier bridge modules, etc.

[0115] Step 2: The compressor changes to a different gear and runs. When two consecutive stable start-stop cycles are reached, the total operating power of the compressor and the total temperature of each key component in the current cycle are counted, and then step 3 is executed;

[0116] Step 3, determine whether all compressor gears have been completed, if yes, then go to step 4, if not, return to step 2;

[0117] Step 4: Select the gear with the smallest total operating power of the compressor and the smallest total temperature of each key component as the optimal gear to achieve energy saving.

[0118] Here, the gear with the smallest total operating power of the compressor corresponds to the second gear in the previous text, and the gear with the smallest total temperature of each key component corresponds to the first gear in the previous text. The two gears are selected according to actual needs (it is also possible that the two gears are the same gear, in which case you can directly choose to run in that gear).

[0119] It can be seen that the present invention obtains the total operating power of the compressor at each gear and the sum of the temperatures of the device to be tested through the above scheme, and can determine the optimal gear, so that the compressor can select the most energy-saving operating gear to work in a stable state.

[0120] Furthermore, the present invention also proposes a rotatable infrared sensor using the above application method, which comprises an infrared sensor and a stepper motor installed at the bottom of the infrared sensor. The stepper motor drives the infrared sensor to rotate and performs temperature detection on the device to be tested.

[0121] Furthermore, the present invention also proposes an air conditioning unit having the above-mentioned rotatable infrared sensor.

[0122] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0123] 1. The present invention is provided with a stepping motor at the bottom of the infrared sensor, so that the infrared sensor can rotate to detect the temperature of the device under test at different positions. That is, the present invention can use one infrared sensor to detect the temperature of the devices under test at multiple different positions, thereby reducing the use cost of the infrared sensor;

[0124] 2. The present invention performs temperature detection on each device under test and performs different processing on different devices under test, so that the air-conditioning controller can be repaired according to the fault problems of different devices under test, thereby increasing the reliability of the air-conditioning controller;

[0125] 3. The present invention is provided with multiple preset rotation angles to detect the ambient temperature, thereby realizing multi-dimensional ambient temperature detection and ensuring the accuracy of ambient temperature detection;

[0126] 4. The present invention can determine the best gear by obtaining the total operating power of the compressor at each gear and the sum of the temperatures of the device to be tested, so that the compressor can select the most energy-saving operating gear to work in a stable state.

[0127] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An application method of a rotatable infrared sensor, the rotatable infrared sensor comprising an infrared sensor and a stepping motor installed at the bottom of the infrared sensor, characterized in that: The application method of the rotatable infrared sensor comprises: Setting a preset rotation angle for the stepper motor according to the position of the device under test, and making the infrared sensor detect a device under test at each preset rotation angle; Controlling the stepper motor to move and pass through all preset rotation angles, and stopping the stepper motor for a first preset time at each preset angle, and the infrared sensor performs temperature detection for the device under test within the first preset time; According to the detection result of the infrared sensor, adjusting or maintaining the working state of the device under test; The device under test includes: an IGBT module of an air-conditioning controller, and a switching power supply IC module; The stepper motor is provided with a first rotation angle and a second rotation angle. At the first rotation angle, the infrared sensor performs temperature detection for the IGBT module, and at the second rotation angle, the infrared sensor performs temperature detection for the switching power supply IC module; When the stepper motor rotates to the first rotation angle, adjusting or maintaining the working state of the device under test according to the detection result of the infrared sensor includes: Determining whether the temperature of the IGBT module exceeds a first preset temperature; If yes, the compressor is controlled to stop for a second preset time, an IGBT module fault is reported, and after the second preset time, when the temperature of the IGBT module is lower than a fourth preset temperature, the fault is determined to be cleared and the compressor is restarted; If not, determining whether the temperature of the IGBT module exceeds a second preset temperature; When the determination is yes, performing frequency reduction processing for the compressor; Wherein, the first preset temperature is higher than the second preset temperature.

2. The application method of the rotatable infrared sensor according to claim 1, characterized in that: When the stepper motor rotates to the second rotation angle, adjusting or maintaining the working state of the device under test according to the detection result of the infrared sensor includes: Determining whether the temperature of the switching power supply IC module exceeds a third preset temperature; When the determination is yes, all loads are turned off for a third preset time, a fault of the switching power IC module is reported, and after the third preset time, when the temperature of the switching power IC module is lower than a fifth preset temperature, the fault is determined to be cleared and the load is restarted.

3. The application method of the rotatable infrared sensor according to claim 1, characterized in that: The application method of the rotatable infrared sensor also includes: Setting a plurality of preset rotation angles for the stepper motor, and all the preset rotation angles are evenly distributed according to the circumference of the stepper motor; Controlling the stepper motor to move and pass through all preset rotation angles, and stopping the stepper motor for a first preset time at each preset angle, wherein the infrared sensor detects the current ambient temperature at the current preset rotation angle within the first preset time; The ambient temperature of the device under test is determined according to the current ambient temperature detected at all preset rotation angles.

4. The application method of the rotatable infrared sensor according to claim 3, characterized in that: The stepper motor is provided with a third rotation angle, a fourth rotation angle, and a fifth rotation angle, and at the third rotation angle, the current ambient temperature detected by the infrared sensor is the first ambient temperature, at the fourth rotation angle, the current ambient temperature detected by the infrared sensor is the second ambient temperature, and at the fifth rotation angle, the current ambient temperature detected by the infrared sensor is the third ambient temperature.

5. The application method of the rotatable infrared sensor according to claim 4, characterized in that: The step of determining the ambient temperature of the device under test according to the current ambient temperature detected at all preset rotation angles includes: Calculate the difference between any two current ambient temperatures, and determine whether the difference is less than a preset threshold; When it is determined that all the differences are less than the preset threshold, calculating an average value of all the current ambient temperatures, and taking the average value as the ambient temperature of the device under test; When there is a difference greater than the preset threshold, the current ambient temperature at all preset rotation angles is re-detected, and after multiple detections, the infrared sensor is reported to be faulty.

6. The application method of the rotatable infrared sensor according to claim 1, characterized in that: The application method of the rotatable infrared sensor also includes: Controlling the compressor to run a start-stop cycle at each gear position, and obtaining the sum of the temperatures of all the components to be tested during the start-stop cycle at each gear position, as well as the total operating power of the compressor; Obtaining a first gear position corresponding to when the sum of the temperatures of all the devices to be tested is minimum, and a second gear position corresponding to when the total operating power of the compressor is minimum; The compressor is controlled to operate in a first gear or a second gear.

7. The application method of the rotatable infrared sensor according to claim 3, characterized in that: The first preset time is 2 seconds, the second preset time is 10 minutes, and the third preset time is 10 minutes. The first preset temperature is 95 degrees, the second preset temperature is 80 degrees, the third preset temperature is 87 degrees, and the fourth preset temperature and the fifth preset temperature are 80 degrees.

8. A rotatable infrared sensor using the application method according to any one of claims 1 to 7, characterized in that: The invention comprises an infrared sensor and a stepping motor installed at the bottom of the infrared sensor. The stepping motor drives the infrared sensor to rotate and performs temperature detection on the device to be tested.

9. An air conditioning unit, characterized in that: The air conditioning unit has the rotatable infrared sensor as claimed in claim 8.

Images