A method and related equipment for preventing frequent fault alarms due to voltage fluctuations

Abstract

The present invention provides a method and related equipment for preventing frequent faults due to voltage fluctuations. When overcurrent protection of an air conditioner is detected, the initial current value, initial frequency, and target initial speed of a fan of the air conditioner before the air conditioner is shut down and restarted are detected. The target frequency and target corrected speed of the fan after the air conditioner is shut down and restarted are calculated based on the initial frequency and the target initial speed of the fan. The air conditioner after the shut down and restart is controlled based on the target frequency and the target corrected speed of the fan. The current value of the air conditioner after the shut down and restart is detected to determine whether the current value and the initial current value meet preset constraint conditions. When the preset conditions are not met, the air conditioner continues to be frequency-reduced, so that the air conditioner can provide stable services to users in a scenario where the power grid voltage fluctuates frequently.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power detection, and in particular to a method and related equipment for preventing frequent fault alarms due to voltage fluctuations. Background Art

[0002] When there is a sharp voltage fluctuation in the air conditioner operating environment, such as 170-253V, and even a low voltage of 120V in some areas, according to P=UI, when the voltage value drops sharply, the current value will instantly surge. At this time, overcurrent protection may occur at the least, causing abnormal shutdown. In severe cases, the more fragile components on the air conditioner's computer board may be broken down, such as IGBT, diodes, etc.

[0003] The existing protection scheme is to set the current protection value (this value must be lower than the maximum current value of the components to be protected). For example, the current protection value of models below 3500W is generally set to 10A-11A. If the overcurrent protection shutdown occurs three times within 10 minutes, an F1 fault will be reported. When an F1 fault occurs, the power must be turned off and then on again for the air conditioner to restart.

[0004] If the objective environment (frequent fluctuations in grid voltage) cannot be changed, the air conditioner may frequently experience F1 failures, causing users to believe that there are quality problems with the equipment itself, and thus complain to the dealer or equipment manufacturer. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a method and related equipment for preventing frequent fault alarms due to voltage fluctuations, so as to prevent the air conditioner from repeatedly performing overvoltage protection due to frequent fluctuations in grid voltage.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A method for preventing frequent fault alarms due to voltage fluctuations, applied to air conditioners, comprising:

[0008] Determine whether the air conditioner has overcurrent protection;

[0009] When overcurrent protection occurs, the initial current value, initial frequency, and target fan initial speed of the air conditioner before it is shut down and restarted are obtained;

[0010] Correcting the initial frequency based on a frequency correction coefficient to obtain a target frequency, wherein the target frequency is less than the initial frequency;

[0011] Correcting the target fan initial speed based on the speed correction value to obtain a target fan correction speed;

[0012] When it is detected that the air conditioner is shut down and restarted, the operating frequency of the air conditioner is controlled to be the target frequency, and the speed of the target fan is controlled to be the target fan correction speed;

[0013] Obtaining a current value after the air conditioner is shut down and restarted, and recording it as a first current value;

[0014] Determining whether a comparison result between the first current value and the initial current value satisfies a preset constraint condition;

[0015] When the preset constraint condition is not satisfied, the air conditioner is frequency-reduced based on a preset step length until the first current value and the initial current value satisfy the preset constraint condition.

[0016] Optionally, the above method for preventing frequent fault alarms due to voltage fluctuations further includes:

[0017] When the air conditioner is detected to have overcurrent protection, it is determined whether the number of overcurrent protections of the air conditioner within the preset time range is greater than the preset value. If it is greater than the preset value, the air conditioner indoor unit is controlled to report a preset fault.

[0018] Optionally, in the above method for preventing frequent faults due to voltage fluctuations, the target fan initial speed is corrected based on the speed correction value to obtain the target fan correction speed, including:

[0019] Get the working status of the air conditioner;

[0020] When the working state of the air conditioner is the cooling state, the sum of the target fan initial speed and the speed correction value is calculated to obtain the target fan correction speed, and the target fan is the air conditioner outdoor fan;

[0021] When the working state of the air conditioner is the heating state, the sum of the target fan initial speed and the speed correction value is calculated to obtain the target fan correction speed, and the target fan is the fan inside the air conditioner.

[0022] Optionally, in the above method for preventing frequent fault alarms due to voltage fluctuations, judging whether the first current value and the initial current value meet preset constraint conditions includes:

[0023] It is determined whether the first current value and the initial current value satisfy the formula: I2<I1*γ, wherein I1 is the initial current value, I2 is the first current value, and γ is a preset coefficient.

[0024] Optionally, in the above method for preventing frequent faults due to voltage fluctuations, the initial frequency is corrected based on a frequency correction coefficient to obtain a target frequency, wherein the target frequency is less than the initial frequency, including:

[0025] The target frequency is calculated based on the formula P2=P1*γ, and the target frequency is less than the initial frequency. P2 is the target frequency, and P1 is the initial frequency.

[0026] Optionally, the above method for preventing frequent fault alarms due to voltage fluctuations further includes:

[0027] Determine whether a reset signal input by the user is obtained;

[0028] When the reset signal is obtained, the frequency value and the external fan speed of the air conditioner are restored to the initial frequency and the target fan initial speed recorded before the air conditioner is shut down and restarted for the first time, respectively.

[0029] A device for preventing frequent fault alarms due to voltage fluctuations, applied to air conditioners, comprising:

[0030] An overcurrent status judgment unit is used to judge whether the air conditioner is in overcurrent protection;

[0031] A data acquisition unit, used to obtain the initial current value, initial frequency, and target fan initial speed before the air conditioner is shut down and restarted when overcurrent protection occurs;

[0032] A target value calculation unit is used to correct the initial frequency based on the frequency correction coefficient to obtain a target frequency, wherein the target frequency is less than the initial frequency; and to correct the target fan initial speed based on the speed correction value to obtain a target fan correction speed;

[0033] A state control power supply, used for controlling the operating frequency of the air conditioner to be the target frequency and the speed of the target fan to be the target fan correction speed when detecting that the air conditioner is stopped and restarted;

[0034] A constraint condition judgment unit, used to obtain a current value after the air conditioner is shut down and restarted, recorded as a first current value, and judge whether the first current value and the initial current value meet a preset constraint condition;

[0035] The frequency fine-tuning unit is used to perform frequency reduction control on the air conditioner based on a preset step size when the preset constraint condition is not met, until the comparison result between the first current value and the initial current value meets the preset constraint condition.

[0036] Optionally, the above device for preventing frequent fault alarms due to voltage fluctuations further includes:

[0037] The fault output unit is used to determine whether the number of overcurrent protection of the air conditioner is greater than a preset value within a preset time range when overcurrent protection of the air conditioner is detected. When it is greater than the preset value, the air conditioner indoor unit is controlled to report a preset fault.

[0038] A device for preventing frequent fault alarms due to voltage fluctuations, comprising:

[0039] Memory and processor;

[0040] The memory is used to store programs;

[0041] The processor is used to execute the program to implement each step of the method for preventing frequent fault alarms due to voltage fluctuations as described in any one of the above items.

[0042] An air conditioner, comprising: the device for preventing frequent fault alarms due to voltage fluctuations as described in any one of the above.

[0043] Based on the above technical scheme, the above scheme provided by the embodiment of the present invention, when it is detected that the air conditioner has overcurrent protection, detects the initial current value, initial frequency, and target fan initial speed of the air conditioner before shutdown and restart, calculates the target frequency and target fan correction speed after the air conditioner is shut down and restarted based on the initial frequency and target fan initial speed, controls the air conditioner after shutdown and restart based on the target frequency and target fan correction speed, and detects the current value after the air conditioner is shut down and restarted, and determines whether the current value and the initial current value meet the preset constraints. When the preset constraints are not met, the air conditioner continues to be frequency-reduced, so that the air conditioner can provide stable services to users in scenarios where the grid voltage fluctuates frequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0045] Figure 1 A flow chart of a method for preventing frequent fault reports due to voltage fluctuations disclosed in an embodiment of the present application;

[0046] Figure 2 A schematic diagram of a device for preventing frequent faults due to voltage fluctuations disclosed in an embodiment of the present application

[0047] Figure 3 This is a schematic diagram of the structure of a device for preventing frequent faults due to voltage fluctuations disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0049] In order to prevent the air-conditioning equipment from frequently over-current protection due to frequent fluctuations in grid voltage, which may cause users to believe that the equipment itself has quality problems, the present application discloses a method for preventing frequent fault reports due to voltage fluctuations. When the method detects that the air-conditioning has over-current protection, the air-conditioning is frequency-reduced and the external fan speed is adjusted to make the input current of the air-conditioning within the allowable range, thereby preventing the air-conditioning from frequently over-current protection.

[0050] The present application discloses a method for preventing frequent fault alarms due to voltage fluctuations, which is applied to air conditioners, see Figure 1 , the method includes: steps S101-S108.

[0051] Step S101: Determine whether the air conditioner is in overcurrent protection.

[0052] In this step, the air conditioner data message is detected to detect whether the air conditioner has overcurrent protection. When overcurrent protection occurs, step S102 is executed.

[0053] Step S102: When overcurrent protection occurs, the initial current value, initial frequency, and target fan initial speed before the air conditioner is shut down and restarted are obtained.

[0054] When overcurrent protection of the air conditioner is detected, the air conditioner will automatically shut down and restart after a period of time (3 minutes or other duration). In this step, the initial current value, initial frequency and target fan initial speed of the air conditioner are obtained before the air conditioner is shut down and restarted. The initial current value, initial frequency and target fan initial speed of the air conditioner can be directly collected from the air conditioner operation data. The current value of the air conditioner can refer to the input current of the air conditioner, the frequency of the air conditioner can refer to the operating frequency of the variable frequency air conditioner, and the external fan speed can refer to the fan speed of the outdoor unit.

[0055] In the present scheme, the target fan can be the indoor fan of the air conditioner or the outdoor fan of the air conditioner. The target fan refers to different objects according to the working mode of the air conditioner. For example, when the air conditioner is in cooling mode, the target fan refers to the outdoor fan of the air conditioner. At this time, the target fan initial speed refers to the corresponding speed of the outdoor fan of the air conditioner before the air conditioner is shut down and restarted. When the air conditioner is in heating mode, the target fan refers to the indoor fan of the air conditioner. At this time, the target fan initial speed refers to the corresponding speed of the indoor fan of the air conditioner before the air conditioner is shut down and restarted.

[0056] Step S103: Correcting the initial frequency based on the frequency correction coefficient to obtain a target frequency, wherein the target frequency is less than the initial frequency.

[0057] After obtaining the initial frequency, the initial frequency is corrected based on the frequency correction coefficient to obtain a target frequency, and the target frequency is less than the initial frequency. In this solution, the air conditioner needs to be frequency-reduced in order to reduce the input current of the air conditioner under the same grid voltage so that the input current of the air conditioner is within an allowable range to prevent the air conditioner from overcurrent protection. The target frequency is the operating frequency of the air conditioner after it is shut down and restarted.

[0058] Step S104: correcting the target fan initial speed based on the speed correction value to obtain a target fan correction speed.

[0059] In this step, after the air conditioner is frequency-reduced, the speed of the target fan is adjusted to provide the user with the temperature control effect that the air conditioner can achieve before the frequency reduction. Specifically, it is necessary to calculate the target fan correction speed based on the target fan initial speed before the air conditioner is shut down and restarted. The target fan correction speed is the speed corresponding to the target fan after the air conditioner is shut down and restarted.

[0060] For example, the target fan can be an inner fan or an outer fan of an air conditioner. When the air conditioner is in a cooling state, after the air conditioner frequency is reduced, the speed of the outer fan is increased to increase the air volume of the outer unit of the air conditioner, thereby accelerating the cooling speed of the air conditioner. When the air conditioner is in a heating state, after the air conditioner frequency is reduced, the speed of the inner fan is increased to accelerate the heating speed of the air conditioner.

[0061] Step S105: when it is detected that the air conditioner is shut down and restarted, the operating frequency of the air conditioner is controlled to be the target frequency, and the speed of the target fan is controlled to be the target fan correction speed.

[0062] In this solution, when it is detected that the air conditioner is shut down and restarted, the working state of the air conditioner is controlled based on the target frequency and the target corrected fan speed, so that the input current of the air conditioner can be reduced.

[0063] Step S106: obtaining a current value after the air conditioner is shut down and restarted, and recording it as a first current value.

[0064] In this step, when it is detected that the air conditioner is shut down and restarted, the operating frequency of the air conditioner is detected. When it is detected that the operating frequency of the air conditioner reaches the target frequency and the stable operation time of the air conditioner reaches a preset time (for example, it can be 5 minutes), the input current value of the air conditioner is obtained and recorded as the first current value.

[0065] Step S107: determining whether the comparison result between the first current value and the initial current value satisfies a preset constraint condition.

[0066] In this solution, a constraint condition is set in advance. After the first current value and the initial current value are obtained, the two are compared to determine whether the comparison result meets the preset constraint condition. If the preset constraint condition is met, it indicates that the probability of overcurrent protection of the air conditioner due to grid voltage fluctuations is reduced, so that the air conditioner can provide continuous service to users in scenarios where the grid voltage fluctuates frequently.

[0067] Step S108: When the preset constraint condition is not satisfied, the air conditioner is frequency-reduced based on a preset step length until the first current value and the initial current value satisfy the preset constraint condition.

[0068] In this step, when it is detected that the air conditioner is shut down and restarted, if the comparison result of the first current value and the initial current value does not meet the preset constraints, the air conditioner is frequency-reduced using a preset step size, and the first current is monitored in real time until the first current value and the initial current value meet the preset constraints, wherein the preset step size can be a frequency reduction of 1 Hz every 30 seconds, or other values, so that the air conditioner can provide stable services to users in scenarios where the grid voltage fluctuates frequently.

[0069] The method for preventing frequent faults due to voltage fluctuations disclosed in the above-mentioned embodiment of the present application, when overcurrent protection of the air conditioner is detected, detects the initial current value, initial frequency, and target initial speed of the fan of the air conditioner before shutdown and restart, calculates the target frequency and target corrected speed of the fan after the air conditioner is shut down and restarted based on the initial frequency and target initial speed of the fan, controls the air conditioner after shutdown and restart based on the target frequency and target corrected speed of the fan, detects the current value after the air conditioner is shut down and restarted, determines whether the current value and the initial current value meet preset constraints, and continues to reduce the frequency of the air conditioner when the preset constraints are not met, so that the air conditioner can provide stable services to users in a scenario where the grid voltage fluctuates frequently.

[0070] In the technical solution disclosed in another embodiment of the present application, considering that if the overcurrent protection is not caused by the fluctuation of the grid voltage, then even after the air conditioner is adjusted as mentioned above, the overcurrent protection will continue after the air conditioner is shut down and restarted. Therefore, for this situation, in the present solution, each time the air conditioner has an overcurrent protection, the count value of the control counter is increased by one. The counter is used to measure the number of times the air conditioner has overcurrent protection within a preset time range. When the air conditioner is detected to have overcurrent protection, it is determined whether the number of times the air conditioner has overcurrent protection within the preset time range is greater than the preset value. When it is greater than the preset value, the air conditioner indoor unit is controlled to report a preset fault. The preset time range may refer to half an hour, or 20 minutes. The preset value may be 3 times, 4 times or other times.

[0071] In the above scheme, the input current value of the air conditioner is reduced by reducing the operating frequency of the air conditioner, wherein the reduction amplitude of the operating frequency of the air conditioner can be determined by a preset coefficient γ, and the size of the preset coefficient γ can be set according to user needs. In this scheme, the value of γ can be 0.95, 0.9 or other values, that is, in the above scheme, the initial frequency is corrected based on the frequency correction coefficient to obtain a target frequency, and the target frequency is less than the initial frequency, including: the target frequency is calculated based on the formula P2=P1*γ, and the target frequency is less than the initial frequency, P2 is the target frequency, P1 is the initial frequency, and γ is the preset coefficient.

[0072] In the technical solution disclosed in another embodiment of the present application, due to different working modes of the air conditioner, the reference object of the target fan is different, and the adjustment method of the fan speed is also different. Therefore, in the above solution, the target fan initial speed is corrected based on the speed correction value to obtain the target fan correction speed, including:

[0073] The working state of the air conditioner is obtained. When the working state of the air conditioner is the cooling state, the target fan is the outdoor fan of the air conditioner. The target fan initial speed is the initial speed of the outdoor fan of the air conditioner. The sum of the initial speed of the outdoor fan and the speed correction value is calculated to obtain the target fan correction speed. The speed correction value is 50 revolutions, or other revolutions. That is, the initial speed of the outdoor fan is increased by 50 revolutions, or other revolutions to obtain the target fan correction speed.

[0074] When the working state of the air conditioner is the heating state, the target fan is the indoor fan of the air conditioner, and the target fan initial speed is the speed of the indoor fan of the air conditioner. The sum of the initial speed of the indoor fan of the air conditioner and the speed correction value is calculated to obtain the target fan correction speed. The target fan is the indoor fan of the air conditioner, that is, the initial speed of the indoor fan is increased by 50 revolutions, or other revolutions to obtain the target fan correction speed.

[0075] In the above scheme disclosed in the embodiment of the present application, the purpose of the above frequency modulation is to reduce the input current value of the air conditioner. If the current value after shutdown and restart does not meet the requirement, it is necessary to continue to reduce the frequency of the air conditioner. In this scheme, this requirement is recorded as a preset constraint condition. In this scheme, the preset constraint condition can be I2<I1*γ, wherein I1 is the initial current value, I2 is the first current value, γ is a preset coefficient, and the value of γ is less than 1, that is, judging whether the first current value and the initial current value meet the preset constraint conditions, including: judging whether the first current value and the initial current value satisfy the formula: I2<I1*γ. When the formula is satisfied, the first current value and the initial current value meet the preset constraint conditions. Otherwise, it indicates that the first current value and the initial current value do not meet the preset constraint conditions.

[0076] After the air conditioner is shut down and restarted, if the overcurrent protection is triggered again, step S101 and its subsequent processes are re-executed until the air conditioner no longer shuts down for protection.

[0077] In the technical solution disclosed in another embodiment of the present application, when the user believes that the grid voltage is stable, he can manually input a reset signal to the air conditioner. After the air conditioner obtains the reset signal input by the user, the frequency value and the external fan speed of the air conditioner are restored to the initial frequency and the target fan initial speed recorded before the air conditioner was shut down and restarted for the first time.

[0078] This embodiment discloses a device for preventing frequent fault alarms due to voltage fluctuations. For the specific working contents of each unit in the device, please refer to the contents of the above method embodiment.

[0079] The following is a description of a device for preventing frequent fault alarms due to voltage fluctuations provided in an embodiment of the present invention. The device for preventing frequent fault alarms due to voltage fluctuations described below and the method for preventing frequent fault alarms due to voltage fluctuations described above can be referenced to each other.

[0080] The device for preventing frequent fault alarms due to voltage fluctuations can be applied to air conditioners, see Figure 2 The device includes: an overcurrent state judgment unit A, a data acquisition unit B, a target value calculation unit C, a state control power supply D, a constraint condition judgment unit E, and a frequency fine-tuning unit F.

[0081] Overcurrent status judgment unit A, used to judge whether the air conditioner is in overcurrent protection;

[0082] The data acquisition unit B is used to obtain the initial current value, initial frequency, and target fan initial speed before the air conditioner is shut down and restarted when overcurrent protection occurs;

[0083] A target value calculation unit C is used to correct the initial frequency based on the frequency correction coefficient to obtain a target frequency, wherein the target frequency is less than the initial frequency; and to correct the target fan initial speed based on the speed correction value to obtain a target fan correction speed;

[0084] A state control power supply D, used to control the operating frequency of the air conditioner to the target frequency and the speed of the target fan to the target fan correction speed when the air conditioner is detected to be stopped and restarted;

[0085] A constraint condition judgment unit E is used to obtain a current value after the air conditioner is shut down and restarted, recorded as a first current value, and judge whether the first current value and the initial current value meet a preset constraint condition;

[0086] The frequency fine-tuning unit F is used to perform frequency reduction control on the air conditioner based on a preset step size when the preset constraint condition is not met, until the comparison result between the first current value and the initial current value meets the preset constraint condition.

[0087] Corresponding to the above method, the above device also includes: a fault output unit, which is used to determine whether the number of overcurrent protection of the air conditioner is greater than a preset value within a preset time range when overcurrent protection of the air conditioner is detected. When it is greater than the preset value, the air conditioner indoor unit is controlled to report a preset fault.

[0088] Corresponding to the above method, the above device may further include: a reset unit, which is used to restore the frequency value and external fan speed of the air conditioner to the initial frequency and target fan initial speed recorded before the air conditioner was shut down and restarted for the first time when the reset signal is obtained.

[0089] Figure 3 The hardware structure diagram of the device for preventing frequent faults due to voltage fluctuations provided by the embodiment of the present invention is shown in FIG. Figure 3 As shown, it may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0090] In the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 communicate with each other through the communication bus 400; obviously, Figure 3 The communication connections shown for the processor 100, the communication interface 200, the memory 300, and the communication bus 400 are merely optional;

[0091] Optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;

[0092] The processor 100 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0093] The memory 300 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0094] The processor 100 is specifically used to execute the various steps of the method for preventing frequent fault reports due to voltage fluctuations disclosed in any one of the above embodiments of the present application.

[0095] Corresponding to the above-mentioned device, the present application also discloses an air conditioner, which is applied with any of the above-mentioned devices for preventing frequent faults due to voltage fluctuations.

[0096] For the convenience of description, the above system is described by dividing it into various modules according to its functions. Of course, when implementing the present invention, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0097] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0098] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0099] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0100] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0101] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preventing frequent faults due to voltage fluctuations, characterized in that: Used in air conditioning, including: Determine whether the air conditioner has overcurrent protection; When overcurrent protection occurs, the initial current value, initial frequency, and target fan initial speed of the air conditioner before it is shut down and restarted are obtained; Correcting the initial frequency based on a frequency correction coefficient to obtain a target frequency, wherein the target frequency is less than the initial frequency; Correcting the target fan initial speed based on the speed correction value to obtain a target fan correction speed; When it is detected that the air conditioner is shut down and restarted, the operating frequency of the air conditioner is controlled to be the target frequency, and the speed of the target fan is controlled to be the target fan correction speed; Obtaining a current value after the air conditioner is shut down and restarted, and recording it as a first current value; Determining whether a comparison result between the first current value and the initial current value satisfies a preset constraint condition; When the preset constraint condition is not satisfied, the air conditioner is frequency-reduced based on a preset step length until the first current value and the initial current value satisfy the preset constraint condition.

2. The method for preventing frequent faults due to voltage fluctuations according to claim 1, characterized in that: Also includes: When the air conditioner is detected to have overcurrent protection, it is determined whether the number of overcurrent protections of the air conditioner within the preset time range is greater than the preset value. If it is greater than the preset value, the air conditioner indoor unit is controlled to report a preset fault.

3. The method for preventing frequent faults due to voltage fluctuations according to claim 1, characterized in that: The target fan initial speed is corrected based on the speed correction value to obtain the target fan correction speed, including: Get the working status of the air conditioner; When the working state of the air conditioner is the cooling state, the sum of the target fan initial speed and the speed correction value is calculated to obtain the target fan correction speed, and the target fan is the air conditioner outdoor fan; When the working state of the air conditioner is the heating state, the sum of the target fan initial speed and the speed correction value is calculated to obtain the target fan correction speed, and the target fan is the fan inside the air conditioner.

4. The method for preventing frequent faults due to voltage fluctuations according to claim 1, characterized in that: Determining whether the first current value and the initial current value satisfy a preset constraint condition includes: It is determined whether the first current value and the initial current value satisfy the formula: I2<I1*γ, wherein I1 is the initial current value, I2 is the first current value, and γ is a preset coefficient.

5. The method for preventing frequent faults due to voltage fluctuations according to claim 4, characterized in that: Correcting the initial frequency based on the frequency correction coefficient to obtain a target frequency, where the target frequency is less than the initial frequency, includes: The target frequency is calculated based on the formula P2=P1*γ, and the target frequency is less than the initial frequency. P2 is the target frequency, and P1 is the initial frequency.

6. The method for preventing frequent faults due to voltage fluctuations according to claim 1, characterized in that: Also includes: Determine whether a reset signal input by the user is obtained; When the reset signal is obtained, the frequency value and the external fan speed of the air conditioner are restored to the initial frequency and the target fan initial speed recorded before the air conditioner is shut down and restarted for the first time, respectively.

7. A device for preventing frequent faults due to voltage fluctuations, characterized in that: Used in air conditioning, including: An overcurrent status judgment unit is used to judge whether the air conditioner is in overcurrent protection; A data acquisition unit, used to obtain the initial current value, initial frequency, and target fan initial speed before the air conditioner is shut down and restarted when overcurrent protection occurs; A target value calculation unit is used to correct the initial frequency based on the frequency correction coefficient to obtain a target frequency, wherein the target frequency is less than the initial frequency; and to correct the target fan initial speed based on the speed correction value to obtain a target fan correction speed; A state control power supply, used for controlling the operating frequency of the air conditioner to be the target frequency and the speed of the target fan to be the target fan correction speed when detecting that the air conditioner is stopped and restarted; A constraint condition judgment unit, used to obtain a current value after the air conditioner is shut down and restarted, recorded as a first current value, and judge whether the first current value and the initial current value meet a preset constraint condition; The frequency fine-tuning unit is used to perform frequency reduction control on the air conditioner based on a preset step size when the preset constraint condition is not met, until the comparison result between the first current value and the initial current value meets the preset constraint condition.

8. The device for preventing frequent faults due to voltage fluctuations according to claim 7, characterized in that: Also includes: The fault output unit is used to determine whether the number of overcurrent protection of the air conditioner is greater than a preset value within a preset time range when overcurrent protection of the air conditioner is detected. When it is greater than the preset value, the air conditioner indoor unit is controlled to report a preset fault.

9. A device for preventing frequent faults due to voltage fluctuations, characterized in that: include: Memory and processor; The memory is used to store programs; The processor is used to execute the program to implement the various steps of the method for preventing frequent faults due to voltage fluctuations as described in any one of claims 1-6.

10. An air conditioner, characterized in that: include: The device for preventing frequent faults due to voltage fluctuations as described in any one of claims 7-8.

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