Air conditioner direct-current fan control method and device, air conditioner equipment and storage medium

Abstract

The application provides a kind of air conditioner DC fan control method, device, air conditioning equipment and storage medium, applied to air conditioning system, air conditioning system includes: with the inverter of power connection, and with the DC fan of inverter connection, method includes: according to the DC bus voltage and output line voltage of inverter, the voltage utilization rate of DC fan is calculated;If voltage utilization rate is greater than the first utilization rate threshold value corresponding to air conditioner work mode, then control DC fan to slow down, until voltage utilization rate is less than second utilization rate threshold value;First utilization rate threshold value is greater than second utilization rate threshold value, and first utilization rate threshold value is the critical value of DC fan step-out, and second utilization rate threshold value is the safety threshold of DC fan operation.When detecting that voltage utilization rate is greater than the critical value of DC fan step-out corresponding to air conditioner work mode, it indicates that DC fan will occur step-out risk, then control DC fan to reduce, and then avoid fan step-out.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically to an air conditioning DC fan control method, device, air conditioning equipment, and storage medium. Background Technology

[0002] With the development of air conditioning technology, people are pursuing energy-saving and environmentally friendly performance from air conditioners while ensuring their temperature regulation capabilities. One common method is to convert the air conditioner fan to an AC / DC inverter fan to achieve energy savings. As the name suggests, DC fans use DC inverter technology to control the air conditioner, maximizing efficiency and reducing power consumption. They are typically equipped with inverters to power the fan. However, insufficient power supply can cause the fan to lose synchronization during high-speed operation. Summary of the Invention

[0003] This application provides a method, device, air conditioning equipment, and storage medium for controlling a DC fan in an air conditioner, in order to solve the problem of the fan losing synchronization at high speed due to insufficient power supply and reduce the risk of the air conditioner fan losing synchronization.

[0004] In a first aspect, this application provides a method for controlling a DC fan in an air conditioner, applied to an air conditioning system, the air conditioning system comprising: an inverter connected to a power source, and a DC fan connected to the inverter, the method comprising:

[0005] Calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter;

[0006] If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then the DC fan is controlled to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold.

[0007] The first utilization threshold is greater than the second utilization threshold. The first utilization threshold is the critical value for the DC fan to lose synchronization, and the second utilization threshold is the safe operating threshold for the DC fan.

[0008] In one possible implementation of this application, the step of controlling the DC fan to reduce speed if the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioner's operating mode, until the voltage utilization rate is less than a second utilization rate threshold, includes:

[0009] If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then the operating parameters of the DC fan are adjusted.

[0010] After the DC fan operates at reduced speed, the new voltage utilization rate of the DC fan is calculated based on the new DC bus voltage and the new output line voltage of the inverter.

[0011] If the new voltage utilization rate is less than the second utilization rate threshold, then the adjustment of the DC fan is stopped.

[0012] In one possible implementation of this application, after calculating the new voltage utilization rate of the DC fan based on the new DC bus voltage and the new output line voltage of the inverter after the DC fan has slowed down, the method further includes:

[0013] If the voltage utilization rate is greater than or equal to the second utilization rate threshold, then the dead time corresponding to the inverter power module is adjusted according to the preset adjustment frequency and preset adjustment duration corresponding to the inverter power module.

[0014] Based on the new DC bus voltage and new output line voltage of the inverter after dead time adjustment, calculate the new voltage utilization rate of the DC fan.

[0015] If the new voltage utilization rate is less than the second utilization rate threshold, the dead time adjustment is stopped.

[0016] In one possible implementation of this application, after controlling the DC fan to slow down if the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, the method further includes:

[0017] If the air conditioner is in heating mode, the DC fan speed is controlled to decrease based on the airflow between the fins of the outdoor heat exchanger in the air conditioner and the voltage utilization rate.

[0018] If the air conditioner is in cooling mode, the voltage utilization rate is detected until it is less than the second utilization rate threshold.

[0019] In one possible implementation of this application, if the air conditioner's operating mode is heating mode, then controlling the DC fan speed reduction based on the airflow between the fins of the outdoor heat exchanger in the air conditioner and the voltage utilization rate further includes:

[0020] If the air conditioner's operating mode is heating mode, then obtain the airflow between the fins of the outdoor heat exchanger in the air conditioner.

[0021] If the airflow is less than the preset flow threshold, the DC fan is controlled to reduce its speed to the fan speed limit value corresponding to the air conditioning heating mode;

[0022] If the airflow rate is greater than or equal to a preset flow rate threshold, the voltage utilization rate is detected until the voltage utilization rate is less than a second utilization rate threshold.

[0023] In one possible implementation of this application, after calculating the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter, the method further includes:

[0024] If the voltage utilization rate is greater than a preset first utilization rate threshold, the inverter's modulation mode is switched to SVPWM modulation.

[0025] In one possible implementation of this application, the step of controlling the DC fan to slow down if the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioner's operating mode, until the voltage utilization rate is less than a second utilization rate threshold, further includes:

[0026] If the voltage utilization rate is less than the second utilization rate threshold, then the rate of decrease of the voltage utilization rate over a preset time period is calculated.

[0027] If the descent rate is greater than a preset descent rate threshold, then the frequency of the DC fan is increased.

[0028] Secondly, this application provides an air conditioning DC fan control device for use in an air conditioning system, the air conditioning system comprising: an inverter connected to a power source, and a DC fan connected to the inverter, the device comprising:

[0029] Calculation module: used to calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter;

[0030] Control module: If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, control the DC fan to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold.

[0031] Wherein, the first utilization threshold is greater than the second utilization threshold, the first utilization threshold is the critical value for the DC fan to lose synchronization, and the second utilization threshold is the safety threshold for the operation of the DC fan.

[0032] Thirdly, this application provides an air conditioning device, the air conditioning device comprising:

[0033] An inverter connected to a power source, and a DC fan connected to the inverter.

[0034] One or more processors;

[0035] Memory; and

[0036] One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement any one of the air conditioning DC fan control methods.

[0037] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to perform the steps in any of the air conditioning DC fan control methods described above.

[0038] This application provides a method, apparatus, air conditioning equipment, and storage medium for controlling a DC fan in an air conditioner. First, the voltage utilization rate of the DC fan is calculated based on the DC bus voltage and output line voltage of the inverter. If the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioning operating mode, the DC fan is controlled to reduce its speed until the voltage utilization rate is less than a second utilization rate threshold. The first utilization rate threshold is greater than the second utilization rate threshold, the first utilization rate threshold is the critical value for the DC fan to lose synchronization, and the second utilization rate threshold is the safety threshold for the DC fan's operation. That is, by controlling the DC bus voltage and output line voltage of the inverter connected to the power supply... The voltage utilization rate of the DC fan is detected and calculated. When the power supply output voltage drops from a high voltage to a low voltage instantaneously, the DC bus voltage drops instantaneously. However, the output line voltage corresponds to the DC fan still being in a high-output demand turntable, which causes the voltage utilization rate to increase instantaneously. When the voltage utilization rate is detected to be greater than the critical value of DC fan step loss corresponding to the air conditioner working mode, it indicates that the DC fan is at risk of step loss. Therefore, the DC fan is controlled to reduce its speed to avoid step loss. Furthermore, by setting different voltage utilization rates for different air conditioner working modes, adaptive adjustments are made to ensure that the DC fan reduction adjustment matches the working environment corresponding to the air conditioner working mode. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of a scenario for the air conditioning DC fan control method provided in an embodiment of this application;

[0041] Figure 2 This is a schematic flowchart of an embodiment of the air conditioner DC fan control method provided in this application.

[0042] Figure 3 A schematic flowchart of one embodiment of the DC fan speed reduction adjustment in the air conditioning DC fan control method provided in this application;

[0043] Figure 4This is a schematic flowchart illustrating another implementation scheme for adjusting the DC fan speed in the air conditioning DC fan control method provided in this application embodiment;

[0044] Figure 5 A schematic flowchart illustrating another embodiment of the air conditioner DC fan control method provided in this application.

[0045] Figure 6 A schematic flowchart illustrating another embodiment of the air conditioning DC fan control method provided in this application.

[0046] Figure 7 This is a schematic diagram of an embodiment of the air conditioner DC fan control device provided in this application.

[0047] Figure 8 This is a schematic diagram of an embodiment of the air conditioning equipment provided in this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0051] This application provides an air conditioner DC fan control method, device, air conditioning equipment, and computer-readable storage medium, which will be described in detail below.

[0052] The air conditioning DC fan control method in this embodiment of the invention is applied to an air conditioning DC fan control device. The air conditioning DC fan control device is installed in an air conditioning unit. The air conditioning unit is provided with one or more processors, a memory, and one or more application programs. The one or more application programs are stored in the memory and configured to be executed by the processor to implement the air conditioning DC fan control method. The air conditioning unit can be an indoor air conditioning unit, an outdoor air conditioning unit, or an air conditioning system including an indoor air conditioning unit and an outdoor air conditioning unit.

[0053] like Figure 1 As shown, Figure 1 This is a schematic diagram of a scenario for an air conditioner DC fan control method according to an embodiment of this application. The air conditioner DC fan control scenario in this embodiment includes an air conditioning device 100 (the air conditioning device 100 integrates an air conditioning DC fan control device). The air conditioning device 100 runs a computer-readable storage medium corresponding to the air conditioning DC fan control to execute the steps of the air conditioning DC fan control.

[0054] Understandable Figure 1 The air conditioning equipment in the scenario of the air conditioning DC fan control method shown, or the devices included in the air conditioning equipment, do not constitute a limitation on the embodiments of the present invention. That is, the number or type of equipment included in the scenario of the air conditioning DC fan control method, or the number or type of devices included in each equipment, do not affect the overall implementation of the technical solution in the embodiments of the present invention, and can all be considered as equivalent substitutions or derivatives of the technical solutions claimed in the embodiments of the present invention.

[0055] In this embodiment of the invention, the air conditioning device 100 is mainly used to: calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter; if the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioning working mode, control the DC fan to reduce speed until the voltage utilization rate is less than the second utilization rate threshold; the first utilization rate threshold is greater than the second utilization rate threshold, the first utilization rate threshold is the critical value for the DC fan to lose synchronization, and the second utilization rate threshold is the safety threshold for the operation of the DC fan.

[0056] Those skilled in the art will understand that Figure 1 The application environment shown is merely one application scenario of the solution in this application and does not constitute a limitation on the application scenario of the solution in this application. Other application environments may include those that are more specific to this application. Figure 1 The number of more or fewer air conditioning units shown, or the network connection relationship of the air conditioning units, for example Figure 1 Only one air conditioning device is shown in the diagram. It is understood that the scenario of the air conditioning DC fan control method may also include one or more other air conditioning devices, which are not specifically limited here. The air conditioning device 100 may also include a memory for storing data, such as storage utilization threshold information.

[0057] Furthermore, in the scenario of the air conditioner DC fan control method of this application, the air conditioning device 100 can be equipped with a display device, or the air conditioning device 100 can be connected to an external display device 200 without a display device. The display device 200 is used to output the result of the execution of the air conditioning DC fan control method in the air conditioning device. The air conditioning device 100 can access the background database 300 (the background database can be in the local storage of the air conditioning device, or it can be set in the cloud). The background database 300 stores information related to the control of the air conditioning DC fan, such as the initial image in the background database 300, or pre-set filtering parameters.

[0058] It should be noted that, Figure 1 The schematic diagram of the air conditioner DC fan control method shown is merely an example. The scenarios of the air conditioner DC fan control method described in the embodiments of the present invention are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided in the embodiments of the present invention.

[0059] Based on the scenario of the above-mentioned air conditioner DC fan control method, an embodiment of the air conditioner DC fan control method is proposed.

[0060] like Figure 2The diagram shown is a flowchart of an embodiment of the air conditioner DC fan control method in this application. This air conditioner DC fan control method is applied to an air conditioning system, which includes: an inverter connected to a power supply, and a DC fan connected to the inverter. The method includes steps S201-S202:

[0061] S201. Calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter.

[0062] The inverter is a power conversion device used to provide frequency conversion current to the DC fan. The DC bus of the inverter is connected to the power supply, and the output line of the inverter is connected to the input of the DC fan. That is, the DC target voltage is the power supply output voltage, and the output line voltage is the effective voltage of the DC fan, that is, the DC fan consumption voltage, which is the voltage corresponding to the fundamental amplitude of the output phase voltage. It can be understood that in the inverter SPWM modulation, when the modulation index is at most 1, the fundamental amplitude of the output phase voltage is Ud / 2, and the fundamental amplitude of the output line voltage is 3 / 2Ud.

[0063] The DC fan is a DC inverter fan, which is used in an inverter air conditioner. In this embodiment, the DC fan is installed inside the outdoor unit of the air conditioner.

[0064] The voltage utilization rate of the DC fan is the ratio of the inverter output line voltage to the DC bus voltage.

[0065] Specifically, in this embodiment, the air conditioner DC fan control method is applied to an air conditioning device. The air conditioning device acquires the DC bus voltage and output line voltage of the inverter through voltage detection devices installed on the output line and DC bus of the inverter, and calculates the voltage utilization rate of the DC fan by calculating the ratio of the output line voltage to the DC bus voltage. It is understood that the voltage detection device, such as a voltage sensor or voltage detector, can acquire the DC bus voltage and output line voltage of the inverter according to a preset voltage acquisition frequency to calculate the voltage utilization rate of the DC fan. The voltage acquisition frequency can be designed based on the actual adjustment accuracy.

[0066] S202. If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then control the DC fan to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold.

[0067] The air conditioner's operating modes include cooling mode and heating mode. The first utilization threshold is greater than the second utilization threshold. The first utilization threshold is the critical value for the DC fan to lose synchronization, and the second utilization threshold is the safety threshold for the DC fan's operation. That is, if the voltage utilization is greater than the first utilization threshold, the DC fan may be at risk of losing synchronization. It is understood that the first utilization threshold can be set differently for different air conditioner operating modes. For example, when the air conditioner's operating mode is heating mode, a relatively high first utilization threshold can be set to reduce the threshold for the DC fan to reduce frequency, thus preventing the DC fan from reducing frequency too early and causing frost on the outdoor unit, while also reducing the risk of the fan losing synchronization. When the air conditioner's operating mode is cooling mode, a relatively low first utilization threshold can be set to greatly avoid the DC fan losing synchronization.

[0068] Specifically, after calculating the voltage utilization rate based on the DC bus voltage and output line voltage of the inverter, the air conditioning equipment obtains the first voltage utilization rate corresponding to the air conditioning operating mode. Then, it compares the voltage utilization rate with the first voltage utilization rate. If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioning operating mode, it indicates that the DC fan is at risk of losing synchronization. The DC fan is then controlled to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold. If the voltage utilization rate is less than or equal to the first utilization rate threshold corresponding to the air conditioning operating mode, the DC fan continues to operate at high speed without speed reduction.

[0069] Specifically, the method for controlling the speed reduction of the DC fan can be designed according to actual needs, and this application does not impose specific limitations. For example:

[0070] One feasible implementation scheme involves controlling the DC fan to slow down to a preset fan speed within a preset time period, and detecting the new voltage utilization rate of the DC fan during the slowdown process. If the new voltage utilization rate is less than a second utilization rate threshold, the slowdown is stopped.

[0071] The second feasible implementation scheme involves controlling the DC fan to downshift at a preset downshift frequency, for example, downshifting by one level every 20 seconds, and detecting the new voltage utilization rate of the DC fan after downshifting. If the new voltage utilization rate is less than a second utilization rate threshold, downshifting is stopped.

[0072] Furthermore, based on the above implementation plan, see [link to relevant documentation]. Figure 3 , Figure 3 This is a flowchart illustrating one implementation scheme of the DC fan speed reduction adjustment in the air conditioning DC fan control method provided in this application, including steps S301-S303:

[0073] S301. If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then adjust the operating parameters of the DC fan.

[0074] Specifically, after the air conditioning equipment detects that the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioning operating mode, it obtains the preset speed reduction parameter corresponding to the DC fan, and controls the DC fan to reduce its speed according to the preset speed reduction parameter. For example:

[0075] However, in the first implementation scheme, the air conditioning equipment obtains the preset speed reduction parameters of the DC fan corresponding to the air conditioning working mode; if the air conditioning working mode is the cooling mode, the preset speed reduction parameters include the downshift frequency and the downshift value, and according to the downshift value, the DC fan is controlled to downshift at the preset downshift frequency.

[0076] However, in the second implementation scheme, the air conditioning equipment obtains the preset speed reduction parameter of the DC fan corresponding to the air conditioning working mode; if the air conditioning working mode is heating mode, the preset speed reduction parameter includes a target speed reduction value, and the DC fan is controlled to speed down according to the target speed reduction value.

[0077] However, in the third implementation scheme, the air conditioning equipment obtains the preset speed reduction parameter of the DC fan; according to the preset speed reduction parameter, the DC fan is controlled to reduce speed. In this implementation scheme, the preset speed reduction parameter can be any one of the two implementation schemes mentioned above.

[0078] S302. After the DC fan is running at reduced speed, calculate the new voltage utilization rate of the DC fan based on the new DC bus voltage and the new output line voltage of the inverter.

[0079] Furthermore, after adjusting the DC fan to run at reduced speed, the air conditioning equipment re-acquires the new DC bus voltage and the new output line voltage of the inverter, and recalculates the voltage utilization rate of the DC fan. Then, it compares the recalculated new voltage utilization rate with the first utilization rate threshold.

[0080] S303. If the new voltage utilization rate is less than the second utilization rate threshold, then stop adjusting the DC fan.

[0081] Furthermore, after the air conditioning equipment compares the newly calculated voltage utilization rate with the first utilization rate threshold, if the new voltage utilization rate is less than the second utilization rate threshold, the speed reduction adjustment of the DC fan will be stopped.

[0082] Furthermore, based on the above implementation plan, see [link to relevant documentation]. Figure 4 , Figure 4This is a flowchart illustrating another implementation scheme for adjusting the DC fan speed in the air conditioning DC fan control method provided in this application, including steps S401-S403:

[0083] S401. If the voltage utilization rate is greater than or equal to the second utilization rate threshold, then adjust the dead time corresponding to the inverter power module according to the preset adjustment frequency and preset adjustment duration corresponding to the inverter power module.

[0084] The dead time of the inverter's power module (IPM module) is the dead time specified in the IPM module manufacturer's specifications. For example, if the manufacturer's specifications specify a dead time of 2µs, the actual design typically allows for a dead time of 3µs. Therefore, the adjustment margin for the dead time is 1µs. Adjusting the dead time is crucial to improving the inverter's voltage conversion efficiency, i.e., increasing voltage utilization. It's understood that there's a process of DC fan deceleration, during which power needs to be supplied for the high-speed operation of the DC fan. By increasing voltage utilization, the output voltage of the DC bus can be maintained to meet the DC fan's operating requirements for a short period, preventing the DC fan from losing synchronization. When the fan speed decreases, the required power decreases, resulting in a decrease in the inverter's output line voltage, and consequently, a decrease in voltage utilization.

[0085] It is understood that the preset adjustment frequency is the frequency at which the dead time is adjusted, and the preset adjustment duration is the duration for each adjustment of the dead time. For example, if the normal dead time is 3µs and the adjustment margin of the dead time is 1µs, the dead time is adjusted by decreasing at a rate of (3-2) / 100µs (preset adjustment duration) every 10 seconds (preset adjustment frequency).

[0086] Specifically, after the air conditioning equipment detects that the DC fan has slowed down, it re-acquires the new DC bus voltage and the new output line voltage of the inverter, calculates the voltage utilization rate of the DC fan, and if the voltage utilization rate is still greater than or equal to the second utilization rate threshold, the dead time corresponding to the inverter power module is adjusted.

[0087] S402. Based on the new DC bus voltage and new output line voltage of the inverter after dead time adjustment, calculate the new voltage utilization rate of the DC fan.

[0088] Furthermore, after adjusting the dead time, the air conditioning unit reacquires a new DC bus voltage and a new output line voltage, and calculates a new voltage utilization rate for the DC fan. The calculated voltage utilization rate is then compared again with the second utilization rate threshold.

[0089] S403. If the new voltage utilization rate is less than the second utilization rate threshold, stop the dead time adjustment.

[0090] Furthermore, after the air conditioning equipment re-compares the calculated voltage utilization rate with the second utilization rate threshold, if the new voltage utilization rate is less than the second utilization rate threshold, the dead time adjustment is stopped, and the adjustment of the DC fan is also stopped. If the voltage utilization rate is not less than the second utilization rate threshold, the dead time is adjusted until the adjustment margin of the dead time is 0, and the speed of the DC fan is reduced until the DC fan drops to the preset minimum speed.

[0091] It is understood that, in the embodiments of this application, the dead time adjustment is interspersed during the process of reducing the speed of the DC fan. Specifically, the dead time adjustment can be added after the DC fan has been adjusted to a preset number of times according to a preset adjustment frequency, and the voltage utilization rate is greater than or equal to the second utilization rate threshold. For example, after the DC fan has been adjusted to a preset number of times according to a preset adjustment frequency, if the voltage utilization rate is still greater than or equal to the second utilization rate threshold, then the dead time is adjusted.

[0092] It is understood that in some other embodiments of this application, the dead time adjustment may also be performed after the DC fan has slowed down to a preset minimum wind speed, if the voltage utilization rate is greater than or equal to a second utilization rate threshold. This application does not make specific limitations on this.

[0093] It is understandable that when the DC bus voltage returns to high voltage for a preset time, the dead time of the inverter's power module will be reset.

[0094] Furthermore, based on the above implementation plan, see [link to relevant documentation]. Figure 5 , Figure 5 A flowchart illustrating another embodiment of the air conditioner DC fan control method provided in this application includes steps S501-S503:

[0095] S501. Calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter.

[0096] The implementation method of step S501 is as described in any of the above implementation schemes.

[0097] S502. If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then control the DC fan to reduce its speed.

[0098] The implementation method of step S502 is as described in any of the above implementation schemes.

[0099] S503. If the air conditioner's operating mode is heating mode, then the DC fan speed is controlled to decrease based on the airflow between the fins of the outdoor heat exchanger in the air conditioner and the voltage utilization rate.

[0100] The airflow between the outdoor heat exchangers can be detected and obtained by a flow detector installed between the outdoor heat exchangers and communicating with the air conditioning equipment. It is understood that when the air conditioner is heating, the outdoor heat exchangers may frost over, affecting the airflow between the fins of the outdoor heat exchangers and thus affecting the heat exchange effect of the outdoor heat exchangers. Therefore, when the air conditioner is in heating mode, the airflow between the fins of the outdoor heat exchangers in the air conditioner is obtained while controlling the fan speed to monitor the frost situation of the outdoor heat exchangers.

[0101] When the air conditioning equipment detects that the airflow between the fins of the outdoor heat exchanger is less than the preset flow threshold, it indicates that the outdoor unit is frosted. At this time, it is necessary to keep the DC fan running at the speed corresponding to the defrosting mode for defrosting. Then, the DC fan is controlled to reduce its speed to the lower limit value of the fan speed corresponding to the air conditioning heating mode to ensure the defrosting function of the DC fan and terminate the adjustment of the DC fan.

[0102] Specifically, in the implementation scheme of this application, if the air conditioner's operating mode is heating mode, the DC fan speed is controlled to decrease based on the airflow between the fins of the outdoor heat exchanger in the air conditioner and the voltage utilization rate, specifically including:

[0103] (1) If the working mode of the air conditioner is heating mode, then obtain the air flow between the fins of the outdoor heat exchanger in the air conditioner.

[0104] (2) If the air flow rate is less than the preset flow rate threshold, the DC fan is controlled to reduce its speed to the fan speed limit value corresponding to the air conditioning heating mode;

[0105] (3) If the air flow rate is greater than or equal to the preset flow rate threshold, the voltage utilization rate is detected until the voltage utilization rate is less than the second utilization rate threshold.

[0106] Among them, the lower limit value of the fan speed corresponding to the air conditioning heating mode is the speed of the DC fan when defrosting in the corresponding air conditioning heating mode. For example, the minimum fan speed of the DC fan in the defrosting mode can be set as the lower limit value of the fan speed corresponding to the air conditioning heating mode. This application does not make specific limitations, and it can be designed according to actual needs.

[0107] Specifically, when the air conditioning equipment controls the DC fan to reduce its speed, if it detects that the airflow between the fins of the outdoor heat exchanger is less than the preset flow threshold, it indicates that the outdoor unit is frosted. At this time, it is necessary to keep the DC fan running at the speed corresponding to the defrosting mode for defrosting. Therefore, the DC fan is controlled to reduce its speed to the lower limit value of the fan speed corresponding to the air conditioning heating mode to ensure the defrosting function of the DC fan.

[0108] Furthermore, in some other embodiments of this application, if the air flow rate is not less than a preset flow rate threshold, it indicates that the outdoor heat exchanger is not frosted, and the DC fan is controlled to reduce its speed until the voltage utilization rate is less than a second utilization rate threshold.

[0109] Furthermore, in some other embodiments of this application, if the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioner's operating mode, and the air conditioner's operating mode is a cooling mode, then the step of controlling the DC fan to reduce its speed is executed until the voltage utilization rate is less than a second utilization rate threshold. For specific implementation details, please refer to any of the above embodiments.

[0110] Furthermore, based on the above implementation plan, see [link to relevant documentation]. Figure 6 , Figure 6 A flowchart illustrating another embodiment of the air conditioning DC fan control method provided in this application includes steps S601-S602:

[0111] S601. Calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter.

[0112] Specifically, the implementation method of step S601 is described in any of the above implementation schemes.

[0113] S602. If the voltage utilization rate is greater than the preset first utilization rate threshold, the inverter's modulation mode is switched to SVPWM modulation, and the DC fan is controlled to slow down until the voltage utilization rate is less than the second utilization rate threshold.

[0114] The SVPWM modulation is the adjustment mode of the inverter. The inverter adjustment modes include SVPWM modulation and SPWM modulation. SPWM modulation has a lower voltage conversion rate, that is, the output line voltage is lower. SVPWM modulation has a relatively higher voltage conversion rate. By switching the inverter adjustment mode to SVPWM modulation, the output line voltage can be greatly improved, avoiding the DC fan from losing synchronization due to insufficient voltage to maintain high speed during the deceleration process.

[0115] Specifically, after the air conditioning equipment detects that the voltage utilization rate is greater than the preset first utilization rate threshold, if the modulation mode of the inverter is SPWM modulation, it controls the modulation mode of the inverter to switch to SVPWM modulation and controls the DC fan to reduce speed until the voltage utilization rate is less than the second utilization rate threshold.

[0116] It is understandable that when the DC bus voltage returns to high voltage for a preset time, the modulation mode of the inverter will be switched to SPWM modulation.

[0117] Furthermore, based on any of the above implementation schemes, if the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, then the DC fan is controlled to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold, including:

[0118] (1) If the voltage utilization rate is less than the second utilization rate threshold, the rate of decrease of the voltage utilization rate over a preset time period is calculated.

[0119] (2) If the rate of decrease is greater than the preset rate of decrease threshold, the frequency of the DC fan is controlled to increase.

[0120] Specifically, when the air conditioning equipment detects that the DC fan speed has decreased and the voltage utilization rate is less than the second utilization rate threshold, it will make the DC fan run at the current fan speed and determine the current voltage utilization rate of the DC fan.

[0121] Furthermore, after a preset duration, the DC bus voltage and output line voltage are re-acquired, and a new voltage utilization rate is calculated. It can be understood that since the DC fan operates at a reduced speed, the output line voltage will not fluctuate much at this time, that is, it can be understood as unchanged. When the DC bus voltage (power supply) becomes the normal high-voltage input, the voltage utilization rate will be greatly reduced. The difference between the new voltage utilization rate after the preset duration and the current voltage utilization rate is calculated, and the voltage utilization rate decrease rate is obtained based on the difference. When the voltage utilization rate decrease rate is greater than the preset decrease rate threshold, it means that the DC bus voltage can support the high-speed rotation of the DC motor. At this time, the DC fan is controlled to increase the frequency to the speed before the speed reduction.

[0122] Specifically, in some other implementations, the air conditioning equipment can also determine the current voltage utilization rate when the voltage utilization rate is less than the second utilization rate threshold after the DC fan speed is reduced, and calculate the difference between the new voltage utilization rate after a preset time and the current voltage utilization rate; if the difference is greater than the preset difference threshold, then control the DC fan to increase the frequency.

[0123] This application provides a method for controlling a DC fan in an air conditioner. First, the voltage utilization rate of the DC fan is calculated based on the DC bus voltage and output line voltage of the inverter. If the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioner's operating mode, the DC fan is controlled to slow down until the voltage utilization rate is less than a second utilization rate threshold. The first utilization rate threshold is greater than the second utilization rate threshold, the first utilization rate threshold is the critical value for the DC fan to lose synchronization, and the second utilization rate threshold is the safety threshold for the DC fan's operation. That is, the method calculates the voltage utilization rate by detecting the DC bus voltage and output line voltage of the inverter connected to the power supply. The voltage utilization rate of the DC fan is calculated. When the power supply output voltage drops instantaneously from high to low, the DC bus voltage drops instantaneously. However, the output line voltage corresponds to the DC fan still being in a high-output demand turntable, which causes the voltage utilization rate to increase instantaneously. When the voltage utilization rate is detected to be greater than the critical value of DC fan step loss corresponding to the air conditioner's working mode, it indicates that the DC fan is at risk of step loss. Therefore, the DC fan is controlled to reduce its speed to avoid step loss. Furthermore, by setting different voltage utilization rates for different air conditioner working modes, adaptive adjustments are made to ensure that the DC fan reduction adjustment matches the working environment corresponding to the air conditioner's working mode.

[0124] To better implement the DC fan control method in this application embodiment, based on the DC fan control method, this application embodiment also provides a DC fan control device applied to an air conditioning system. The air conditioning system includes: an inverter connected to a power supply, and a DC fan connected to the inverter, such as... Figure 7 As shown, the DC fan control device includes modules 701-702:

[0125] Calculation module 701: used to calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter;

[0126] Control module 702: If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner working mode, control the DC fan to reduce the speed until the voltage utilization rate is less than the second utilization rate threshold.

[0127] Wherein, the first utilization threshold is greater than the second utilization threshold, the first utilization threshold is the critical value for the DC fan to lose synchronization, and the second utilization threshold is the safe operating threshold for the DC fan.

[0128] In one embodiment of this application, the control module 702 is configured to control the DC fan to reduce its speed until the voltage utilization rate is less than a second utilization threshold if the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioner's operating mode. Specifically, this includes:

[0129] If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then the operating parameters of the DC fan are adjusted.

[0130] After the DC fan operates at reduced speed, the new voltage utilization rate of the DC fan is calculated based on the new DC bus voltage and the new output line voltage of the inverter.

[0131] If the new voltage utilization rate is less than the second utilization rate threshold, then the adjustment of the DC fan is stopped.

[0132] In one embodiment of this application, the control module 702 is configured to, after the DC fan has slowed down, calculate the new voltage utilization rate of the DC fan based on the new DC bus voltage and the new output line voltage of the inverter, and further includes:

[0133] If the voltage utilization rate is greater than or equal to the second utilization rate threshold, then the dead time corresponding to the inverter power module is adjusted according to the preset adjustment frequency and preset adjustment duration corresponding to the inverter power module.

[0134] Based on the new DC bus voltage and new output line voltage of the inverter after dead time adjustment, calculate the new voltage utilization rate of the DC fan.

[0135] If the new voltage utilization rate is less than the second utilization rate threshold, the dead time adjustment is stopped.

[0136] In one embodiment of this application, the control module 702: after controlling the DC fan to reduce its speed if the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, further includes:

[0137] If the air conditioner is in heating mode, the DC fan speed is controlled to decrease based on the airflow between the fins of the outdoor heat exchanger in the air conditioner and the voltage utilization rate.

[0138] If the air conditioner is in cooling mode, the voltage utilization rate is detected until it is less than the second utilization rate threshold.

[0139] In one embodiment of this application, the control module 702 is configured to: control the DC fan speed reduction based on the airflow between the fins of the outdoor heat exchanger in the air conditioner and the voltage utilization rate if the air conditioner's operating mode is heating mode; specifically, it further includes:

[0140] If the air conditioner's operating mode is heating mode, then obtain the airflow between the fins of the outdoor heat exchanger in the air conditioner.

[0141] If the airflow is less than the preset flow threshold, the DC fan is controlled to reduce its speed to the fan speed limit value corresponding to the air conditioning heating mode;

[0142] If the airflow rate is greater than or equal to a preset flow rate threshold, the voltage utilization rate is detected until the voltage utilization rate is less than a second utilization rate threshold.

[0143] In one embodiment of this application, the calculation module 701, after calculating the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter, further includes:

[0144] If the voltage utilization rate is greater than a preset first utilization rate threshold, the inverter's modulation mode is switched to SVPWM modulation.

[0145] In one embodiment of this application, the control module 702 is configured to control the DC fan to reduce its speed if the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioner's operating mode, until the voltage utilization rate is less than a second utilization rate threshold. Specifically, it further includes the following functions:

[0146] When the DC fan speed is reduced and the voltage utilization rate is less than the second utilization rate threshold, the current voltage utilization rate is determined, and the difference between the new voltage utilization rate after a preset time and the current voltage utilization rate is calculated.

[0147] If the difference is greater than a preset difference threshold, the frequency of the DC fan is increased.

[0148] This application provides an air conditioner DC fan control device. First, based on the DC bus voltage and output line voltage of the inverter, the voltage utilization rate of the DC fan is calculated. If the voltage utilization rate is greater than a first utilization rate threshold corresponding to the air conditioner's operating mode, the DC fan is controlled to slow down until the voltage utilization rate is less than a second utilization rate threshold. The first utilization rate threshold is greater than the second utilization rate threshold; the first utilization rate threshold is the critical value for the DC fan to lose synchronization, and the second utilization rate threshold is the safety threshold for the DC fan's operation. That is, by detecting the DC bus voltage and output line voltage of the inverter connected to the power supply, the voltage utilization rate is calculated. The voltage utilization rate of the DC fan is calculated. When the power supply output voltage drops instantaneously from high to low, the DC bus voltage drops instantaneously. However, the output line voltage corresponds to the DC fan still being in a high-output demand turntable, which causes the voltage utilization rate to increase instantaneously. When the voltage utilization rate is detected to be greater than the critical value of DC fan step loss corresponding to the air conditioner's working mode, it indicates that the DC fan is at risk of step loss. Therefore, the DC fan is controlled to reduce its speed to avoid step loss. Furthermore, by setting different voltage utilization rates for different air conditioner working modes, adaptive adjustments are made to ensure that the DC fan reduction adjustment matches the working environment corresponding to the air conditioner's working mode.

[0149] This invention also provides an air conditioning device, such as... Figure 8 As shown, Figure 8 This is a schematic diagram of an embodiment of the air conditioning equipment provided in this application.

[0150] The air conditioning unit integrates any of the compressor frequency adjustment devices provided in the embodiments of the present invention, and the air conditioning unit includes:

[0151] An inverter connected to a power source, and a DC fan connected to the inverter;

[0152] One or more processors;

[0153] Memory; and

[0154] One or more applications, wherein the one or more applications are stored in the memory and configured by the processor to perform the steps of the compressor frequency adjustment method described in any of the embodiments of the compressor frequency adjustment method described above.

[0155] Specifically, an air conditioning device may include components such as a processor 801 with one or more processing cores, a memory 802 with one or more computer-readable storage media, a power supply 803, and an input unit 804. Those skilled in the art will understand that... Figure 8The air conditioning equipment structure shown does not constitute a limitation on the air conditioning equipment and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein:

[0156] The processor 801 is the control center of the air conditioning unit. It connects to various parts of the unit via various interfaces and lines. By running or executing software programs and / or modules stored in the memory 802, and by calling data stored in the memory 802, it performs various functions and processes data, thereby providing overall monitoring of the air conditioning unit. Optionally, the processor 801 may include one or more processing cores; preferably, the processor 801 may integrate an application processor and a modem processor. The application processor primarily handles the operating system, user interface, and applications, while the modem processor primarily handles wireless communication. It is understood that the modem processor may not be integrated into the processor 801.

[0157] The memory 802 can be used to store software programs and modules. The processor 801 executes various functional applications and data processing by running the software programs and modules stored in the memory 802. The memory 802 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created based on the use of the air conditioning equipment, etc. In addition, the memory 802 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 802 may also include a memory controller to provide the processor 801 with access to the memory 802.

[0158] In some embodiments of this application, the air conditioning control device can be implemented as a computer program, and the computer program can be implemented in, for example... Figure 8 The air conditioning unit shown is running. The air conditioning unit's memory can store the various program modules that make up the air conditioning control device, for example, Figure 7 The calculation module 701 and control module 702 are shown. The computer program, composed of these various program modules, causes the processor to execute the steps in the air conditioning control methods of the various embodiments of this application described in this specification.

[0159] For example, Figure 8 The air conditioning equipment shown can be used as follows Figure 7The computing module 701 in the air conditioning control device shown executes step S201. The air conditioning device can execute step S202 via the control module 702. The air conditioning device includes a processor, memory, and network interface connected via a system bus. The processor of the air conditioning device provides computing and control capabilities. The memory of the air conditioning device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface of the air conditioning device is used to communicate with external air conditioning devices via a network connection. When the computer program is executed by the processor, it implements an air conditioning control method.

[0160] The air conditioning equipment also includes a power supply 803 that supplies power to various components. Preferably, the power supply 803 can be logically connected to the processor 801 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 803 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0161] The air conditioning unit may also include an input unit 804, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0162] Although not shown, the air conditioning device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 801 in the air conditioning device loads the executable files corresponding to the processes of one or more application programs into the memory 802 according to the following instructions, and the processor 801 runs the application programs stored in the memory 802 to realize various functions, as follows:

[0163] Calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter;

[0164] If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, then the DC fan is controlled to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold.

[0165] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0166] Therefore, embodiments of the present invention provide a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc. A computer program is stored thereon, which is loaded by a processor to execute the steps in any of the compressor frequency adjustment methods provided in the embodiments of the present invention. For example, the computer program loaded by the processor can execute the following steps:

[0167] Calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter;

[0168] If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, then the DC fan is controlled to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold.

[0169] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0170] In practice, each of the above units or structures can be implemented as an independent entity or can be arbitrarily combined to be implemented as the same or several entities. For the specific implementation of each of the above units or structures, please refer to the previous method embodiments, which will not be repeated here.

[0171] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0172] The above provides a detailed description of an air conditioning DC fan control method, device, air conditioning equipment, and storage medium provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for controlling a DC fan in an air conditioner, characterized in that, Applied to an air conditioning system, the air conditioning system comprising: an inverter connected to a power source, and a DC fan connected to the inverter, the method comprising: Calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter; If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, then the DC fan is controlled to slow down until the voltage utilization rate is less than the second utilization rate threshold; the first utilization rate threshold is greater than the second utilization rate threshold, the first utilization rate threshold is the critical value for the DC fan to lose synchronism, and the second utilization rate threshold is the safety threshold for the DC fan to operate; Wherein, the step of controlling the DC fan to reduce speed if the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, until the voltage utilization rate is less than the second utilization rate threshold, includes: If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then the operating parameters of the DC fan are adjusted. After the DC fan operates at reduced speed, the new voltage utilization rate of the DC fan is calculated based on the new DC bus voltage and the new output line voltage of the inverter. If the new voltage utilization rate is less than the second utilization rate threshold, then the adjustment of the DC fan is stopped.

2. The air conditioning DC fan control method according to claim 1, characterized in that, After the DC wind turbine slows down and is operated at reduced speed, the method of calculating the new voltage utilization rate of the DC wind turbine based on the new DC bus voltage and the new output line voltage of the inverter further includes: If the voltage utilization rate is greater than or equal to the second utilization rate threshold, then the dead time corresponding to the inverter power module is adjusted according to the preset adjustment frequency and preset adjustment duration corresponding to the inverter power module. Based on the new DC bus voltage and new output line voltage of the inverter after dead time adjustment, calculate the new voltage utilization rate of the DC fan. If the new voltage utilization rate is less than the second utilization rate threshold, the dead time adjustment is stopped.

3. The air conditioning DC fan control method according to claim 1, characterized in that, If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, then after controlling the DC fan to reduce its speed, the method further includes: If the air conditioner is in heating mode, the DC fan speed is controlled to decrease based on the airflow between the fins of the outdoor heat exchanger in the air conditioner and the voltage utilization rate. If the air conditioner is in cooling mode, the voltage utilization rate is detected until it is less than the second utilization rate threshold.

4. The air conditioning DC fan control method according to claim 3, characterized in that, If the air conditioner's operating mode is heating mode, then controlling the DC fan speed reduction based on the airflow between the outdoor heat exchanger fins and the voltage utilization rate further includes: If the air conditioner's operating mode is heating mode, then obtain the airflow between the fins of the outdoor heat exchanger in the air conditioner. If the airflow is less than the preset flow threshold, the DC fan is controlled to reduce its speed to the fan speed limit value corresponding to the air conditioning heating mode; If the airflow rate is greater than or equal to a preset flow rate threshold, the voltage utilization rate is detected until the voltage utilization rate is less than a second utilization rate threshold.

5. The air conditioning DC fan control method according to claim 1, characterized in that, After calculating the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter, the method further includes: If the voltage utilization rate is greater than a preset first utilization rate threshold, the inverter's modulation mode is switched to SVPWM modulation.

6. The air conditioning DC fan control method according to any one of claims 1-5, characterized in that, If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's operating mode, then the DC fan is controlled to slow down until the voltage utilization rate is less than the second utilization threshold. The method further includes: If the voltage utilization rate is less than the second utilization rate threshold, then the rate of decrease of the voltage utilization rate over a preset time period is calculated. If the descent rate is greater than a preset descent rate threshold, then the frequency of the DC fan is increased.

7. An air conditioner DC fan control device, characterized in that, An air conditioning system is used in an air conditioning system, the air conditioning system comprising: an inverter connected to a power source, and a DC fan connected to the inverter, the device comprising: Calculation module: used to calculate the voltage utilization rate of the DC fan based on the DC bus voltage and output line voltage of the inverter; Control module: If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, control the DC fan to reduce its speed until the voltage utilization rate is less than the second utilization rate threshold; wherein, the first utilization rate threshold is greater than the second utilization rate threshold, the first utilization rate threshold is the critical value for the DC fan to lose synchronism, and the second utilization rate threshold is the safety threshold for the DC fan to operate. Specifically, the control module is used for: If the voltage utilization rate is greater than the first utilization rate threshold corresponding to the air conditioner's working mode, then the operating parameters of the DC fan are adjusted. After the DC fan operates at reduced speed, the new voltage utilization rate of the DC fan is calculated based on the new DC bus voltage and the new output line voltage of the inverter. If the new voltage utilization rate is less than the second utilization rate threshold, then the adjustment of the DC fan is stopped.

8. An air conditioning device, characterized in that, The air conditioning equipment includes: An inverter connected to a power source, and a DC fan connected to the inverter. One or more processors; Memory; and One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the air conditioning DC fan control method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the steps of the air conditioning DC fan control method according to any one of claims 1 to 6.

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