Protection control method and device for air conditioner compressor, air conditioner and medium

Abstract

The invention discloses a protection control method and device for an air conditioner compressor, an air conditioner and a medium. The invention relates to the technical field of air conditioners. The method comprises the steps that the low-level output duration time of an intelligent power module and the phase current peak value of a compressor are obtained; and performing protection control on the compressor according to the low-level duration time and the phase current peak value. The compressor is protected and controlled according to the low-level duration time and the phase current peak value, and real faults and instantaneous interference can be effectively distinguished, so that mistaken protection shutdown is reduced, and the stability and reliability of air conditioner operation are improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a protection and control method, device, air conditioner and medium for an air conditioning compressor. Background Technology

[0002] In variable frequency air conditioners, permanent magnet synchronous motors are widely used as the drive core of the compressor. However, the permanent magnets are prone to irreversible demagnetization under overcurrent, leading to a significant deterioration in compressor performance. To prevent this problem, existing technologies generally employ overcurrent protection methods based on intelligent power modules: a sampling resistor monitors the compressor's operating current and converts it into an operating voltage. A comparator compares this operating voltage with a fixed reference voltage; when the operating voltage exceeds the fixed reference voltage, the intelligent power module triggers overcurrent protection.

[0003] However, during actual use and operation, the presence of electromagnetic interference, working environment and other interference factors can easily cause the comparator to trigger a high level erroneously, causing the intelligent power module to erroneously execute overcurrent protection, resulting in frequent compressor shutdowns. This not only affects the user experience, but also reduces the stability and reliability of the air conditioner's operation. Summary of the Invention

[0004] This invention provides a protection and control method, device, air conditioner, and medium for an air conditioner compressor, aiming to solve the problem of low stability and reliability in the operation of existing air conditioners.

[0005] In a first aspect, embodiments of the present invention provide a protection control method for an air conditioner compressor, comprising: Obtain the duration of the low-level output of the intelligent power module and the peak value of the compressor's phase current; The compressor is protected based on the duration of the low level and the peak value of the phase current.

[0006] Secondly, embodiments of the present invention also provide a protection control device for an air conditioning compressor, comprising: The acquisition unit is used to acquire the duration of the low-level output of the intelligent power module and the peak value of the phase current of the compressor; A control unit is used to perform protective control on the compressor based on the duration of the low level and the peak value of the phase current.

[0007] Thirdly, embodiments of the present invention also provide an air conditioner including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the above-described method.

[0008] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the above-described method.

[0009] This invention provides a protection and control method, device, air conditioner, and medium for an air conditioner compressor. The method includes: acquiring the duration of a low-level output from an intelligent power module and the peak value of the compressor's phase current; and performing protection control on the compressor based on the low-level duration and the peak value of the phase current. The technical solution of this invention, by protecting and controlling the compressor based on the low-level duration and the peak value of the phase current, can effectively distinguish between real faults and transient interference, thereby reducing false protection shutdowns and improving the stability and reliability of air conditioner operation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic flowchart illustrating a protection control method for an air conditioner compressor according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a sub-process of a protection control method for an air conditioner compressor provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of another sub-process of a protection control method for an air conditioner compressor provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of another sub-process of a protection and control method for an air conditioner compressor provided in an embodiment of the present invention; Figure 5 A simplified flowchart of a protection control method for an air conditioner compressor provided in an embodiment of the present invention; Figure 6 A schematic block diagram of a protection control device for an air conditioner compressor provided in an embodiment of the present invention; Figure 7 This is a schematic block diagram of an air conditioner provided in an embodiment of the present invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0014] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0015] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0016] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0017] Please see Figure 1 , Figure 1 This is a schematic flowchart illustrating a protection and control method for an air conditioner compressor according to an embodiment of the present invention. The protection and control method for the air conditioner compressor will be described in detail below. Figure 1 As shown, the method includes the following steps S110-S120.

[0018] S110, Obtain the duration of the low-level output of the intelligent power module and the peak value of the phase current of the compressor; In this embodiment of the invention, a comprehensive diagnosis is performed by real-time monitoring of the low-level duration (Tfo) of the low-level signal (Fo) output by the intelligent power module (IPM module) and combining it with the compressor's phase current peak value (Imax) to distinguish between genuine faults and interference signals, thereby effectively preventing abnormal compressor shutdowns caused by false protection. Specifically, data initialization is first performed, setting two key thresholds: the minimum allowable low-level duration of Fo and the current threshold for compressor overcurrent protection. The minimum low-level duration is a preset low-level time TMin, which is used to initially determine the authenticity of Fo. The current threshold for compressor overcurrent protection is a preset current threshold It. Subsequently, the low-level duration Tfo of the Fo signal output and the compressor's phase current peak value Imax are continuously collected.

[0019] S120. Protective control is performed on the compressor based on the duration of the low level and the peak value of the phase current.

[0020] In this embodiment of the invention, after obtaining the low-level duration and the peak phase current of the compressor, the compressor is protected and controlled according to the low-level duration, the peak phase current, the preset low-level time, and the preset current threshold.

[0021] In this embodiment, such as Figure 2 As shown, step S120 specifically includes steps S121-S126: S121. If the duration of the low level is not less than the preset low level time, then the duration of the low level is compared with the first low level adjustment time, wherein the first low level adjustment time is calculated based on the preset low level time and is greater than the preset low level time. S122. If the duration of the low level is less than the first low level adjustment time, then update the detection count; S123. If the number of detections is greater than the preset number of detections, the peak value of the phase current is obtained, and it is determined whether the peak value of the phase current is greater than or equal to the preset current threshold. If the peak value of the phase current is greater than or equal to the preset current threshold, step S124 is executed; otherwise, step S125 is executed. S124. Update the overcurrent low-level time to the low-level duration and output an overcurrent protection signal to control the compressor to stop; S125. Obtain the power supply voltage of the module where the compressor is located, and compare the power supply voltage with a preset voltage threshold. S126. If the power supply voltage is greater than or equal to the preset voltage threshold, an undervoltage protection signal is output, and the step of controlling the compressor to stop is executed.

[0022] In this embodiment of the invention, the low-level duration Tfo is compared with the preset low-level time TMin: if Tfo < Tmin, it indicates that the low-level signal output by the intelligent power module is most likely caused by transient interference, and this signal will be ignored, normal monitoring will continue, and the process will return to the steps of obtaining the low-level duration of the intelligent power module output and the peak value of the compressor's phase current. If Tfo ≥ Tmin, it indicates that the low-level duration has reached a level requiring further judgment, and a more in-depth judgment will be made in conjunction with current information. Specifically, the low-level duration (Tfo) is compared with the first low-level adjustment time, where the first low-level adjustment time is a time calculated based on the preset low-level time Tmin and combined with the adjustment factor a, and the first low-level adjustment time = (1+a)Tmin. It can be understood that comparing the low-level duration with the first low-level adjustment time aims to quickly filter out those signals with abnormal durations that require further attention. If the comparison result is Tfo < the first low-level adjustment time, it will not be immediately determined as a fault, but the detection count K will be updated, at which point K = K+1. It should be noted that the comparison of detection counts fully considers the randomness and sporadic nature of interference in industrial environments. A single abnormal pulse may be caused by accidental strong interference, but if similar short-term abnormal signals repeatedly occur within a certain period (i.e., the number of detections K is greater than the preset number of detections), it indicates that there may be a continuous, risky abnormal state that has not yet reached typical overcurrent conditions. In this case, the phase current peak value judgment needs to be initiated. The phase current peak value judgment is the core of distinguishing between "true overcurrent" and "false interference." If the phase current peak value Imax ≥ the preset current threshold It, it is confirmed that the Fo signal is caused by a real overcurrent event, not interference. Once overcurrent is confirmed, an overcurrent protection signal will be output immediately, and the compressor will be shut down to prevent damage to the intelligent power module and compressor due to continuous overcurrent. Simultaneously, the low-level duration (Tfo) of the Fo signal that triggered the protection is updated to a new overcurrent low-level duration (Tc). Understandably, by continuously adjusting the protection threshold in real time, parameter self-adaptation is achieved, which can more accurately and promptly identify similar overcurrent risks, reduce false protection shutdowns, and improve the stability and reliability of air conditioning operation.

[0023] Furthermore, if the peak phase current Imax is detected to be less than the preset current threshold It, it indicates that no real overcurrent fault has occurred in the compressor circuit. At this time, the low level of the Fo signal is likely due to other abnormalities. In order to accurately diagnose the root cause of the fault, the power supply status of the intelligent power module will be checked. Specifically, hardware overcurrent is shielded, the compressor is running normally, the DC bus power supply voltage Vcc of the intelligent power module is read, and Vcc is compared with the preset voltage threshold Ut. If the power supply voltage Vcc ≥ the preset voltage threshold Ut, the current Fo signal is determined to be valid, and the fault is that the power supply voltage of the intelligent power module has abnormally increased above the undervoltage protection point, that is, "undervoltage protection" has occurred. The undervoltage protection signal is output, and the steps to control the compressor to stop are executed.

[0024] In one embodiment, such as this embodiment, as Figure 3 As shown, after step S125, the method further includes: S127, if the supply voltage is less than the preset voltage threshold, then update the recording count and compare the recording count with the preset recording count; S128, if the recording count is not greater than the preset recording count, then perform the step of comparing the supply voltage with the preset voltage threshold; S129, if the recording count is greater than the preset recording count, then update the preset low-level time to the second low-level adjustment time; S130, clear the recording count and the detection count to zero, and perform the step of obtaining the low-level duration of the intelligent power module output and the peak value of the compressor phase current. Specifically, if the supply voltage Vcc is detected to be less than the preset voltage threshold (Ut), it indicates that the current power supply level is within the normal range and will not immediately trigger undervoltage protection. At this time, the recording count is updated. The recording count is used to record the counter for this type of "low voltage but not reaching the undervoltage standard" event, that is, the recording count P is increased by one (P = P + 1). Next, the current number of records P is compared with the preset number of records (e.g., set to 2). If the current number of records P has not exceeded the preset number of records (i.e., P≤2), it is determined that this type of low voltage situation is an acceptable, occasional fluctuation (e.g., it may be caused by instantaneous disturbances in the power grid or slight changes in the load), which is not enough to constitute an undervoltage fault that requires immediate protective measures. Therefore, the supply voltage Vcc is re-acquired and compared with the preset voltage threshold Ut. Understandably, this design is equivalent to a software debouncing or filtering mechanism. By introducing the number of records to determine the number of records, it effectively avoids malfunctions caused by instantaneous voltage spikes or measurement interference, and improves the anti-interference capability and operational stability in complex power grid environments.

[0025] It should be noted that in this embodiment, when the number of records (P) is greater than the preset number of records (e.g., 2 times), it indicates that the Fo signal abnormality has been detected multiple times in a short period of time, but the corresponding compressor current and module power supply voltage are both in normal condition. This strongly suggests the existence of a continuous external interference, causing the Fo signal to be frequently falsely triggered. To adapt to this interference environment, the preset low-level time (Tmin) used as the judgment benchmark is updated to a longer second low-level adjustment time, where the second low-level adjustment time is usually (1+b)Tmin, b is an adjustment factor, and b is less than a, thereby increasing the immunity threshold to interference signals. In the future, only Fo low-level signals with longer durations will be included in subsequent diagnosis. Subsequently, the number of records P and the number of detections K are cleared to reset the judgment state, and the initial step of "acquiring the low-level duration of the intelligent power module output and the peak value of the compressor phase current" is restarted, thereby forming a complete closed-loop control with self-learning capabilities.

[0026] In one embodiment, such as this embodiment, as Figure 4As shown, after step S121, the method further includes: S131, if the low-level duration is not less than the first low-level adjustment time, then read the overcurrent low-level time and compare the overcurrent low-level time with the low-level duration; S132, if the low-level duration is less than or equal to the overcurrent low-level time, then execute the step of obtaining the phase current peak value and determining whether the phase current peak value is greater than or equal to a preset current threshold; S133, if the low-level duration is greater than the overcurrent low-level time, then read the overtemperature low-level time and compare the overtemperature low-level time with the low-level duration; S134, if the low-level duration is not greater than the overtemperature low-level time, then update the overtemperature low-level time to the low-level duration; S135, if the low-level duration is greater than the overtemperature low-level time, then output an overtemperature protection signal and execute the step of controlling the compressor to stop. Specifically, if Tfo ≥ (1+a)Tmin, then the overcurrent low-level time Tc is read, and Tfo is compared with Tc; if Tfo ≤ Tc, it indicates that the duration of the current Fo signal falls within the overcurrent fault time range, then the step of obtaining the phase current peak value and determining whether the phase current peak value is greater than or equal to the preset current threshold is executed. Understandably, if Tfo > Tc, it indicates that the duration of the current fault signal has exceeded the scope of the conventional overcurrent fault, and it is necessary to further investigate whether it is an overheating fault, the overtemperature low-level time Tt, and Tfo is compared with Tt. If Tfo ≤ Tt, it indicates that although the duration of the current fault signal is long, it has not yet reached the level that requires immediate triggering of overtemperature protection, then Tt is updated to the current Tfo value, that is, Tt = Tfo, so as to adjust the overtemperature low-level time to make it closer to the current (or potentially continuous) heating process. That is, by continuously adjusting the protection threshold in real time, parameter self-adaptation is achieved, and similar overheating trends can be identified earlier, thereby improving the timeliness of protection. After the update is completed, return to continue monitoring; understandably, if Tfo> Tt, it indicates that the low level duration of the Fo signal has exceeded the allowable upper limit of the over-temperature protection. Combined with the validity of the Fo signal itself, the intelligent power module is determined to be over-temperature fault. At this time, the over-temperature protection signal will be output immediately, and the steps to control the compressor to stop will be executed to prevent the intelligent power module from being damaged due to continuous high temperature.

[0027] Please see Figure 5 , Figure 5 This is a simplified flowchart illustrating a protection control method for an air conditioner compressor according to an embodiment of the present invention. Figure 5As shown, key parameters such as the minimum allowable low-level duration Tmin of the Fo signal, the compressor overcurrent threshold It, the overcurrent low-level time Tc, and the overtemperature low-level time Tt are set. The low-level duration Tfo of the Fo signal output by the intelligent power module and the peak phase current Imax of the compressor are monitored in real time. When Tfo is less than Tmin, it is determined to be an instantaneous interference and ignored. If Tfo exceeds Tmin but does not reach the first low-level adjustment time (1+a)Tmin (a is the adjustment factor), the detection count K is updated. Only when K accumulates to exceed the preset detection count (e.g., 2 times) in a short period of time is it considered to have a potential risk and proceed to the next step of current verification. The peak phase current Imax of the compressor at this time is read and compared with the preset current threshold It. If Imax is greater than or equal to It, a real overcurrent fault is confirmed and the compressor is immediately shut down. The compressor is shut down and overcurrent protection is triggered. Simultaneously, the overcurrent low-level time Tc is updated to the low-level duration Tfo. At this point, Tc = Tfo, achieving adaptive learning of the protection threshold. If Imax is less than It, the possibility of overcurrent is ruled out, and a "hardware overcurrent shielding" operation is performed to maintain normal compressor operation. The system then checks whether the power supply voltage Vcc of the intelligent power module is less than the preset voltage threshold Ut. If Vcc is not less than Ut, an undervoltage protection signal is output, controlling the compressor to stop. If Vcc is less than Ut, the number of records P is updated. When P exceeds the preset number of records (e.g., 2 times) within a short period, a persistent interference is identified, and an adaptive adjustment mechanism is activated, updating Tmin to a longer (1+b)Tmin (b is an adjustment factor) to improve immunity to persistent interference. Afterward, counters K and P are reset, and monitoring restarts. If Tfo > Tc, Tfo is further compared with the over-temperature protection time Tt. If Tfo is greater than Tt, over-temperature protection is triggered, controlling the compressor to stop; otherwise, Tt is updated to track changes in the module's thermal state. The protection and control method for the air conditioner compressor in this application can effectively distinguish between real faults and interference, significantly improving the stability and reliability of air conditioner operation. It should be noted that in this embodiment, a,b∈(0,1). It should also be noted that in this embodiment, by continuously adjusting the protection threshold in real time during air conditioner operation, parameter self-adaptation is achieved, effectively improving the timeliness of detecting false protection, thereby improving the stability and reliability of air conditioner operation and extending the service life of the air conditioner.

[0028] Figure 6 This is a schematic block diagram of a protection control device 200 for an air conditioner compressor provided in an embodiment of the present invention. Figure 6 As shown, corresponding to the above-described protection and control method for an air conditioner compressor, the present invention also provides a protection and control device 200 for an air conditioner compressor. This protection and control device 200 includes a unit for executing the above-described protection and control method for the air conditioner compressor, and the device can be configured in an air conditioner. Specifically, please refer to... Figure 6 The protection and control device 200 for the air conditioner compressor includes an acquisition unit 201 and a control unit 202. Detailed descriptions of each functional module are as follows: Acquisition unit 201 is used to acquire the duration of the low level output of the intelligent power module and the peak value of the phase current of the compressor; Control unit 202 is used to perform protective control on the compressor based on the duration of the low level and the peak value of the phase current.

[0029] In some embodiments, such as this one, the control unit 202 is specifically used for: If the duration of the low level is not less than the preset low level time, then the duration of the low level is compared with the first low level adjustment time, wherein the first low level adjustment time is calculated based on the preset low level time and is greater than the preset low level time; If the duration of the low level is less than the first low level adjustment time, then update the detection count; If the number of detections is greater than the preset number of detections, the peak value of the phase current is obtained, and it is determined whether the peak value of the phase current is greater than or equal to the preset current threshold. If the peak phase current is greater than or equal to the preset current threshold, the overcurrent low-level time is updated to the low-level duration, and an overcurrent protection signal is output to control the compressor to stop.

[0030] In some embodiments, such as this one, the control unit 202 is further configured to: If the peak phase current is less than the preset current threshold, the power supply voltage of the module where the compressor is located is obtained and compared with the preset voltage threshold. If the power supply voltage is greater than or equal to the preset voltage threshold, an undervoltage protection signal is output, and the step of controlling the compressor to stop is executed.

[0031] In some embodiments, such as this one, the control unit 202 is further configured to: If the power supply voltage is less than the preset voltage threshold, then update the number of records and compare the number of records with the preset number of records; If the number of records is not greater than the preset number of records, then the step of comparing the power supply voltage with the preset voltage threshold is performed.

[0032] In some embodiments, such as this one, the control unit 202 is further configured to: If the number of records is greater than the preset number of records, then the preset low-level time is updated to the second low-level adjustment time; The number of records and the number of detections are cleared to zero, and the steps of obtaining the duration of the low level output of the intelligent power module and the peak value of the compressor phase current are executed.

[0033] In some embodiments, such as this one, the control unit 202 is further configured to: If the duration of the low level is not less than the first low level adjustment time, then the overcurrent low level time is read and compared with the low level duration; If the duration of the low level is less than or equal to the overcurrent low level time, then the steps of obtaining the phase current peak value and determining whether the phase current peak value is greater than or equal to a preset current threshold are executed.

[0034] In some embodiments, such as this one, the control unit 202 is further configured to: If the low-level duration is greater than the overcurrent low-level duration, then the overtemperature low-level duration is read and compared with the low-level duration. If the duration of the low level is not greater than the over-temperature low level time, then the over-temperature low level time is updated to the duration of the low level. If the duration of the low level is longer than the over-temperature low level duration, an over-temperature protection signal is output, and the step of controlling the compressor to stop is executed.

[0035] The aforementioned protection and control device for the air conditioner compressor can be implemented as a computer program, which can, for example... Figure 7 The air conditioner shown is running.

[0036] Please see Figure 7 , Figure 7 This is a schematic block diagram of an air conditioner provided in an embodiment of the present invention. The air conditioner 300 is a device capable of compressor protection control.

[0037] See Figure 7 The air conditioner 300 includes a processor 302, a memory, and a network interface 305 connected via a system bus 301. The memory may include a non-volatile storage medium 303 and internal memory 304.

[0038] The non-volatile storage medium 303 can store an operating system 3031 and a computer program 3032. When the computer program 3032 is executed, it causes the processor 302 to execute a protection control method for an air conditioning compressor.

[0039] The processor 302 provides computing and control capabilities to support the operation of the entire air conditioner 300.

[0040] The internal memory 304 provides an environment for the operation of the computer program 3032 in the non-volatile storage medium 303. When the computer program 3032 is executed by the processor 302, the processor 302 can execute a protection control method for an air conditioning compressor.

[0041] This network interface 305 is used for network communication with other devices. Those skilled in the art will understand that... Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the air conditioner 300 to which the present invention is applied. The specific air conditioner 300 may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0042] The processor 302 is used to run a computer program 3032 stored in a memory to implement any embodiment of the above-described protection and control method for the air conditioner compressor.

[0043] It should be understood that, in this embodiment of the invention, the processor 302 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0044] It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by a processor in the computer system to implement the process steps of the embodiments of the above methods.

[0045] Therefore, the present invention also provides a storage medium. This storage medium can be a computer-readable storage medium. The storage medium stores a computer program. When executed by a processor, the computer program causes the processor to perform any embodiment of the protection control method for the air conditioner compressor described above.

[0046] The storage medium can be any computer-readable storage medium capable of storing program code, such as a USB flash drive, portable hard drive, read-only memory (ROM), magnetic disk, or optical disk.

[0047] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0048] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0049] The steps in the method of this invention can be adjusted, merged, or reduced in order according to actual needs. The units in the device of this invention can be merged, divided, or reduced according to actual needs. Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0050] 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 storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part 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 to cause an air conditioner to perform all or part of the steps of the methods described in the various embodiments of the present invention.

[0051] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0052] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims and their equivalents, this invention also intends to include these modifications and variations.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A protection and control method for an air conditioning compressor, characterized in that, include: Obtain the duration of the low-level output of the intelligent power module and the peak value of the compressor's phase current; The compressor is protected based on the duration of the low level and the peak value of the phase current.

2. The method according to claim 1, characterized in that, The step of protecting and controlling the compressor based on the low-level duration and the phase current peak value includes: If the duration of the low level is not less than the preset low level time, then the duration of the low level is compared with the first low level adjustment time, wherein the first low level adjustment time is calculated based on the preset low level time and is greater than the preset low level time; If the duration of the low level is less than the first low level adjustment time, then update the detection count; If the number of detections is greater than the preset number of detections, the peak value of the phase current is obtained, and it is determined whether the peak value of the phase current is greater than or equal to the preset current threshold. If the peak phase current is greater than or equal to the preset current threshold, the overcurrent low-level time is updated to the low-level duration, and an overcurrent protection signal is output to control the compressor to stop.

3. The method according to claim 2, characterized in that, After the step of determining whether the peak phase current is greater than or equal to a preset current threshold, the method further includes: If the peak phase current is less than the preset current threshold, the power supply voltage of the module where the compressor is located is obtained and compared with the preset voltage threshold. If the power supply voltage is greater than or equal to the preset voltage threshold, an undervoltage protection signal is output, and the step of controlling the compressor to stop is executed.

4. The method according to claim 3, characterized in that, After the step of comparing the supply voltage with a preset voltage threshold, the method further includes: If the power supply voltage is less than the preset voltage threshold, then update the number of records and compare the number of records with the preset number of records; If the number of records is not greater than the preset number of records, then the step of comparing the power supply voltage with the preset voltage threshold is performed.

5. The method according to claim 4, characterized in that, After the step of comparing the number of records with the preset number of records, the method further includes: If the number of records is greater than the preset number of records, then the preset low-level time is updated to the second low-level adjustment time; The number of records and the number of detections are cleared to zero, and the steps of obtaining the duration of the low level output of the intelligent power module and the peak value of the phase current of the compressor are executed.

6. The method according to claim 2, characterized in that, After the step of comparing the low-level duration with the first low-level adjustment time, the method further includes: If the duration of the low level is not less than the first low level adjustment time, then the overcurrent low level time is read and compared with the low level duration; If the duration of the low level is less than or equal to the overcurrent low level time, then the step of obtaining the peak value of the phase current and determining whether the peak value of the phase current is greater than or equal to a preset current threshold is executed.

7. The method according to claim 6, characterized in that, After the step of comparing the overcurrent low-level time with the low-level duration, the method further includes: If the low-level duration is greater than the overcurrent low-level duration, then the overtemperature low-level duration is read and compared with the low-level duration. If the duration of the low level is not greater than the over-temperature low level time, then the over-temperature low level time is updated to the duration of the low level. If the duration of the low level is longer than the over-temperature low level duration, an over-temperature protection signal is output, and the step of controlling the compressor to stop is executed.

8. A protection and control device for an air conditioner compressor, characterized in that, include: The acquisition unit is used to acquire the duration of the low-level output of the intelligent power module and the peak value of the phase current of the compressor; A control unit is used to perform protective control on the compressor based on the duration of the low level and the peak value of the phase current.

9. An air conditioner, characterized in that, The air conditioner includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, can implement the method as described in any one of claims 1-7.

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