Electric fan mosquito repelling method and device based on dynamic high-frequency injection

Abstract

The invention discloses an electric fan mosquito repelling method and device based on dynamic high-frequency injection, and the method comprises the steps: driving a brushless direct current motor of an electric fan to drive fan blades to rotate, and adjusting a pulse width modulation carrier wave in a magnetic field orientation control algorithm of the brushless direct current motor to a preset frequency; injecting a high-frequency square wave voltage signal to a d axis of an estimated rotor synchronous rotating coordinate system of the brushless direct current motor based on a preset frequency by using a dynamic high-frequency injection technology; sampling q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal; determining an actual rotor angle of an actual rotor synchronous rotating coordinate system of the brushless direct current motor based on the current signal; based on the actual rotor angle, the brushless direct current motor is controlled to generate an ultrasonic mosquito repelling signal. The electric fan can generate variable-frequency ultrasonic mosquito repelling signals, so that the cost of consumables is effectively reduced, and the convenience is improved; and the rotating fan blades of the electric fan can accelerate sound wave diffusion, and the mosquito repelling rate is increased.

Description

Technical Field

[0001] The present application relates to the field of smart home technology, and in particular to a method and device for repelling mosquitoes with an electric fan based on dynamic high-frequency injection. Background Art

[0002] In the summer, mosquito bites are a serious problem, and users often resort to repelling mosquitoes with electric mosquito coils or swatters. However, these repellent measures require constant use of repellent liquid or manual repelling, which can be costly or inconvenient. Summary of the Invention

[0003] The present application provides an electric fan mosquito repellent method and device based on dynamic high-frequency injection to solve the technical problems that traditional mosquito repellent methods require consumables or manual operation.

[0004] In order to solve the above technical problems, in the first aspect, the present application provides an electric fan mosquito repellent method based on dynamic high-frequency injection, comprising:

[0005] The brushless DC motor driving the electric fan drives the fan blades to rotate, and the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor is adjusted to a preset frequency;

[0006] Using dynamic high-frequency injection technology, based on the preset frequency, a high-frequency square wave voltage signal is injected into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor;

[0007] Sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal;

[0008] determining an actual rotor angle of an actual rotor synchronous rotation coordinate system of the brushless DC motor based on the current signal;

[0009] Based on the actual rotor angle, the brushless DC motor is controlled to generate an ultrasonic mosquito repellent signal.

[0010] In some embodiments, adjusting the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor to a preset frequency includes:

[0011] Determining a target preset frequency corresponding to a current operating mode of the electric fan, the current operating mode including a day mode, a night mode, a high-power mode, and an energy-saving mode;

[0012] The main control chip of the electric fan is used to adjust the pulse width modulation carrier in the magnetic field oriented control algorithm of the brushless DC motor to the target preset frequency.

[0013] In some embodiments, before determining the target preset frequency corresponding to the current operating mode of the electric fan, the method further includes:

[0014] When the light intensity of the environment in which the electric fan is located is greater than a preset light intensity value, controlling the current working mode of the electric fan to be a daytime mode;

[0015] When the light intensity of the environment in which the electric fan is located is not greater than the preset light intensity value, controlling the current working mode of the electric fan to be a night mode;

[0016] When the humidity of the environment in which the electric fan is located is greater than a preset humidity, the current working mode of the electric fan is controlled to be a strong mode, wherein the strong mode is a mode in which the frequency of the working mode and the night mode are superimposed;

[0017] When the current time of the environment of the electric fan is the preset early morning period, the current working mode of the electric fan is controlled to be an energy-saving mode.

[0018] In some embodiments, the method of injecting a high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor based on the preset frequency using the dynamic high-frequency injection technology includes:

[0019] Determining the high-frequency square wave voltage signal based on the preset frequency using a preset high-frequency voltage determination function;

[0020] injecting the high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor;

[0021] The expression of the preset high-frequency voltage determination function is:

[0022] Vd * =Vd base +V hf ·sin(2πF hf t);

[0023] Vd * is a high-frequency square wave voltage signal, Vd base is the normal flux control voltage signal, V hf is the high frequency amplitude, F hf is the preset frequency.

[0024] In some embodiments, sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal includes:

[0025] Based on the six-bridge-arm three-phase drive circuit, sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a q-axis current sampling signal;

[0026] Amplitude modulation is performed on the q-axis current sampling signal to obtain the current signal, which includes a low-frequency component and a high-frequency component.

[0027] In some embodiments, determining the actual rotor angle of the brushless DC motor in an actual rotor synchronous rotation coordinate system based on the current signal includes:

[0028] Using a low-pass filter, low-pass filtering the current signal to obtain an error signal;

[0029] An estimated rotor angle of the estimated rotor synchronous coordinate system corresponding to when the error signal is transformed to 0 is determined, and the estimated rotor angle is used as the actual rotor angle.

[0030] In some embodiments, controlling the brushless DC motor to generate an ultrasonic mosquito repellent signal based on the actual rotor angle includes:

[0031] Based on the actual rotor angle, the angle and speed of the brushless DC motor are updated through a phase-locked loop to generate an ultrasonic mosquito repellent signal.

[0032] In a second aspect, the present application further provides an electric fan mosquito repellent device based on dynamic high-frequency injection, comprising:

[0033] a driving module, configured to drive the brushless DC motor of the electric fan to rotate the fan blades, and adjust the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor to a preset frequency;

[0034] an injection module, configured to inject a high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor based on the preset frequency using a dynamic high-frequency injection technology;

[0035] a sampling module, configured to sample the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal;

[0036] a determination module, configured to determine an actual rotor angle of an actual rotor synchronous rotation coordinate system of the brushless DC motor based on the current signal;

[0037] A control module is used to control the brushless DC motor to generate an ultrasonic mosquito repellent signal based on the actual rotor angle.

[0038] In a third aspect, the present application further provides an electric fan device, comprising a processor and a memory, wherein the memory is used to store a computer program, and when the computer program is executed by the processor, the electric fan mosquito repellent method based on dynamic high-frequency injection as described in the first aspect is implemented.

[0039] In a fourth aspect, the present application further provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the electric fan mosquito repellent method based on dynamic high-frequency injection as described in the first aspect.

[0040] Compared with the prior art, this application has at least the following beneficial effects:

[0041] Through dynamic high-frequency injection, the brushless DC motor of the electric fan generates a variable-frequency ultrasonic mosquito repellent signal, eliminating the need for consumables and manual mosquito repellent operations, effectively reducing consumable costs and improving convenience; and the rotating blades of the electric fan can accelerate the diffusion of sound waves and increase the mosquito repellent rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a flow chart of a method for repelling mosquitoes with an electric fan based on dynamic high-frequency injection according to an embodiment of the present application;

[0043] Figure 2 This is a structural block diagram of an electric fan mosquito repellent device based on dynamic high-frequency injection according to an embodiment of the present application;

[0044] Figure 3 This is a structural block diagram of an electric fan device shown in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] Please refer to Figure 1 , Figure 1 The flowchart of the electric fan mosquito repellent method based on dynamic high frequency injection provided in the embodiment of the present application is as follows. The electric fan mosquito repellent method based on dynamic high frequency injection in the embodiment of the present application can be applied to electric fan equipment. Figure 1 As shown, the electric fan mosquito repellent method based on dynamic high-frequency injection of this embodiment includes steps S101 to S105, which are described in detail as follows:

[0047] In step S101 , a brushless DC motor of the electric fan is driven to rotate fan blades, and a pulse width modulation carrier in a field oriented control algorithm of the brushless DC motor is adjusted to a preset frequency.

[0048] In this step, the preset frequency is the adjustable ultrasonic frequency of the ultrasonic mosquito repellent signal. The fan's brushless DC motor vibrates to generate variable-frequency ultrasound, enabling adjustable ultrasound intensity to meet the needs of various scenarios. The rotation of the fan blades also accelerates the spread of ultrasound, improving the mosquito repellent effect.

[0049] In some embodiments, adjusting the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor to a preset frequency includes:

[0050] Determining a target preset frequency corresponding to a current operating mode of the electric fan, the current operating mode including a day mode, a night mode, a high-power mode, and an energy-saving mode;

[0051] The main control chip of the electric fan is used to adjust the pulse width modulation carrier in the magnetic field oriented control algorithm of the brushless DC motor to the target preset frequency.

[0052] In this embodiment, the Field-Oriented Control (FOC) algorithm is a motor control strategy. It is a variable-frequency drive control method that controls a three-phase brushless DC motor by controlling the amplitude and frequency of the inverter's output voltage. The pulse-width modulation carrier (PWM carrier) in the FOC algorithm can be directly modified by the fan's main control chip.

[0053] Optionally, when the light intensity of the environment in which the electric fan is located is greater than a preset light intensity value, the current working mode of the electric fan is controlled to be a daytime mode;

[0054] When the light intensity of the environment in which the electric fan is located is not greater than the preset light intensity value, controlling the current working mode of the electric fan to be a night mode;

[0055] When the humidity of the environment in which the electric fan is located is greater than a preset humidity, the current working mode of the electric fan is controlled to be a strong mode, wherein the strong mode is a mode in which the frequency of the working mode and the night mode are superimposed;

[0056] When the current time of the environment of the electric fan is the preset early morning period, the current working mode of the electric fan is controlled to be an energy-saving mode.

[0057] In this optional embodiment, the electric fan is provided with an ambient light sensor, a temperature and humidity sensor, and an electronic clock. The ambient light sensor collects the light intensity of the environment in which the electric fan is located, and the current working mode is selected as day mode or night mode according to the light intensity; the temperature and humidity sensor collects the humidity of the environment in which the electric fan is located. When the humidity is greater than the preset humidity, it is determined that the activity of mosquitoes has increased, so the ultrasonic frequency needs to be increased. Then, a strong mode can be superimposed on the day mode and the night mode, for example, the preset frequency is increased to 20% of the day mode or the night mode; in the early morning hours, users usually fall asleep, and the energy-saving mode can be started, such as ultrasonic mosquito repellent for 5 minutes / sleep for 2 minutes, which can reduce power consumption by 60%.

[0058] Step S102 : using a dynamic high-frequency injection technique, based on the preset frequency, injecting a high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor.

[0059] In this step, a high-frequency square wave is injected into the brushless DC motor. This short-term strong excitation will induce transient electromagnetic shock. When the PWM carrier is increased to 28kHz, the high-frequency square wave injection generates ultrasonic waves of 20kHz to 24kHz. The dynamic high-frequency injection technology of this embodiment can be specifically a high-frequency pulse injection technology. A pulsating voltage vector is injected into the estimated rotor synchronous rotating coordinate system. By detecting the high-frequency current response caused by the rotor salient pole and decoupling the position error signal, low-speed / zero-speed rotor position / speed observation is achieved. By injecting a high-frequency signal into the d-axis of the estimated rotor synchronous rotating coordinate system, the current pulsation component in the q-axis is small and negligible, which can avoid torque pulsation and high-frequency loss caused by injection.

[0060] Optionally, step S102 includes: determining the high-frequency square wave voltage signal based on the preset frequency using a preset high-frequency voltage determination function; injecting the high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor;

[0061] The expression of the preset high-frequency voltage determination function is:

[0062] Vd * =Vd base +V hf ·sin(2πF hf t);

[0063] Vd * is a high-frequency square wave voltage signal, Vd base is the normal flux control voltage signal, V hf is the high frequency amplitude, F hf is the preset frequency, and t is the high frequency injection time.

[0064] In this embodiment, a high-frequency square wave voltage signal is determined by presetting a high-frequency voltage determination function, so as to facilitate high-frequency voltage injection into the brushless DC motor.

[0065] Step S103 : sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal.

[0066] In this step, it is estimated that the d-axis component and q-axis component of the high-frequency current in the rotor synchronous rotating coordinate system are both related to the error angle of the rotor position. When the error angle is 0, the q-axis high-frequency current is 0. Therefore, the q-axis high-frequency current can be sampled as the observation signal of the rotor position, and the actual rotor position can be obtained thereby.

[0067] In some embodiments, step S103 includes:

[0068] Based on the six-bridge-arm three-phase drive circuit, sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a q-axis current sampling signal;

[0069] Amplitude modulation is performed on the q-axis current sampling signal to obtain the current signal, which includes a low-frequency component and a high-frequency component.

[0070] In this embodiment, current sampling is performed on the lower arm of the three-phase bridge based on the six-bridge-arm three-phase drive circuit. The q-axis current sampling signal is a high-frequency component. After amplitude modulation (such as multiplying the q-axis current sampling signal by sinwt), a current signal containing high-frequency and low-frequency components is obtained. This current signal is used to observe and estimate the error angle of the rotor position.

[0071] Step S104: determining an actual rotor angle of an actual rotor synchronous rotation coordinate system of the brushless DC motor based on the current signal.

[0072] In this embodiment, the current signal is related to the error angle of the estimated rotor position and is therefore used to observe the actual rotor angle.

[0073] In some embodiments, step S104 includes:

[0074] Using a low-pass filter, low-pass filtering the current signal to obtain an error signal;

[0075] An estimated rotor angle of the estimated rotor synchronous coordinate system corresponding to when the error signal is transformed to 0 is determined, and the estimated rotor angle is used as the actual rotor angle.

[0076] In this embodiment, a low-pass filter removes the high-frequency components of the current signal to extract the error signal, thereby preventing interference with fundamental control. After linearizing the error signal, when it is transformed to zero, the rotor error angle is also zero, so the corresponding estimated rotor angle is the actual rotor angle.

[0077] Step S105 : Based on the actual rotor angle, controlling the brushless DC motor to generate an ultrasonic mosquito repellent signal.

[0078] In this embodiment, based on the actual rotor angle, the angle and speed of the brushless DC motor are updated through a phase-locked loop to generate an ultrasonic mosquito repellent signal.

[0079] In order to implement the electric fan mosquito repellent method based on dynamic high frequency injection corresponding to the above method embodiment, to achieve the corresponding functions and technical effects. Figure 2 , Figure 2 The following is a block diagram of a fan-driven mosquito repellent device based on dynamic high-frequency injection provided by an embodiment of the present application. For ease of explanation, only the parts related to this embodiment are shown. The fan-driven mosquito repellent device based on dynamic high-frequency injection provided by an embodiment of the present application includes:

[0080] A driving module 201 is configured to drive the brushless DC motor of the electric fan to rotate the fan blades and adjust the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor to a preset frequency;

[0081] An injection module 202 is configured to inject a high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor based on the preset frequency using a dynamic high-frequency injection technique;

[0082] a sampling module 203, configured to sample the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal;

[0083] A determination module 204 is configured to determine an actual rotor angle of an actual rotor synchronous rotation coordinate system of the brushless DC motor based on the current signal;

[0084] The control module 205 is configured to control the brushless DC motor to generate an ultrasonic mosquito repellent signal based on the actual rotor angle.

[0085] In some embodiments, the driving module 201 is specifically configured to:

[0086] Determining a target preset frequency corresponding to a current operating mode of the electric fan, the current operating mode including a day mode, a night mode, a high-power mode, and an energy-saving mode;

[0087] The main control chip of the electric fan is used to adjust the pulse width modulation carrier in the magnetic field oriented control algorithm of the brushless DC motor to the target preset frequency.

[0088] In some embodiments, the driving module 201 is further configured to:

[0089] When the light intensity of the environment in which the electric fan is located is greater than a preset light intensity value, controlling the current working mode of the electric fan to be a daytime mode;

[0090] When the light intensity of the environment in which the electric fan is located is not greater than the preset light intensity value, controlling the current working mode of the electric fan to be a night mode;

[0091] When the humidity of the environment in which the electric fan is located is greater than a preset humidity, the current working mode of the electric fan is controlled to be a strong mode, wherein the strong mode is a mode in which the frequency of the working mode and the night mode are superimposed;

[0092] When the current time of the environment of the electric fan is the preset early morning period, the current working mode of the electric fan is controlled to be an energy-saving mode.

[0093] In some embodiments, the injection module 202 is specifically configured to:

[0094] Determining the high-frequency square wave voltage signal based on the preset frequency using a preset high-frequency voltage determination function;

[0095] injecting the high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor;

[0096] The expression of the preset high-frequency voltage determination function is:

[0097] Vd * =Vd base +V hf ·sin(2πF hf t);

[0098] Vd * is a high-frequency square wave voltage signal, Vd base is the normal flux control voltage signal, V hf is the high frequency amplitude, F hf is the preset frequency.

[0099] In some embodiments, the sampling module 203 is specifically configured to:

[0100] Based on the six-bridge-arm three-phase drive circuit, sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a q-axis current sampling signal;

[0101] Amplitude modulation is performed on the q-axis current sampling signal to obtain the current signal, which includes a low-frequency component and a high-frequency component.

[0102] In some embodiments, the determining module 204 is specifically configured to:

[0103] Using a low-pass filter, low-pass filtering the current signal to obtain an error signal;

[0104] An estimated rotor angle of the estimated rotor synchronous coordinate system corresponding to when the error signal is transformed to 0 is determined, and the estimated rotor angle is used as the actual rotor angle.

[0105] In some embodiments, the control module 205 is specifically configured to:

[0106] Based on the actual rotor angle, the angle and speed of the brushless DC motor are updated through a phase-locked loop to generate an ultrasonic mosquito repellent signal.

[0107] The above-mentioned electric fan mosquito repellent device based on dynamic high-frequency injection can implement the electric fan mosquito repellent method based on dynamic high-frequency injection of the above-mentioned method embodiment. The optional options in the above-mentioned method embodiment also apply to this embodiment and will not be described in detail here. The remaining contents of the embodiments of this application can be referred to the contents of the above-mentioned method embodiment and will not be repeated in this embodiment.

[0108] Figure 3 This is a schematic diagram of the structure of an electric fan device provided in one embodiment of the present application. Figure 3 As shown, the electric fan device 3 of this embodiment includes: at least one processor 30 ( Figure 3 Only one is shown), a memory 31 and a computer program 32 stored in the memory 31 and executable on the at least one processor 30, wherein the processor 30 implements the steps of any of the above method embodiments when executing the computer program 32.

[0109] The electric fan device 3 can be a computing device such as a smart phone, a tablet computer, a desktop computer, a cloud server, etc. The electric fan device may include but is not limited to a processor 30 and a memory 31. It will be understood by those skilled in the art that Figure 3 This is merely an example of the electric fan device 3 and does not constitute a limitation on the electric fan device 3 . The electric fan device 3 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electric fan device 3 may also include input and output devices, network access devices, etc.

[0110] The processor 30 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor may be a microprocessor or any conventional processor.

[0111] In some embodiments, the memory 31 may be an internal storage unit of the electric fan device 3, such as a hard disk or memory of the electric fan device 3. In other embodiments, the memory 31 may also be an external storage device of the electric fan device 3, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electric fan device 3. Furthermore, the memory 31 may also include both an internal storage unit of the electric fan device 3 and an external storage device. The memory 31 is used to store an operating system, application programs, a boot loader, data, and other programs, such as the program code of the computer program. The memory 31 may also be used to temporarily store data that has been output or is about to be output.

[0112] In addition, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0113] An embodiment of the present application provides a computer program product. When the computer program product is run on an electric fan device, the electric fan device implements the steps in the above-mentioned method embodiments.

[0114] In several embodiments provided in the present application, it is understood that each box in the flow chart or block diagram can represent a part of a module, program segment or code, and the part of the module, program segment or code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which depends on the functions involved.

[0115] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0116] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application by those skilled in the art should be included within the scope of protection of this application.

Claims

1. A mosquito repellent method using an electric fan based on dynamic high-frequency injection, characterized in that: include: The brushless DC motor driving the electric fan drives the fan blades to rotate, and the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor is adjusted to a preset frequency; Using dynamic high-frequency injection technology, based on the preset frequency, a high-frequency square wave voltage signal is injected into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor; Sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal; determining an actual rotor angle of an actual rotor synchronous rotation coordinate system of the brushless DC motor based on the current signal; Based on the actual rotor angle, the brushless DC motor is controlled to generate an ultrasonic mosquito repellent signal.

2. The electric fan mosquito repellent method based on dynamic high frequency injection according to claim 1, characterized in that: The step of adjusting the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor to a preset frequency includes: Determining a target preset frequency corresponding to a current operating mode of the electric fan, the current operating mode including a day mode, a night mode, a high-power mode, and an energy-saving mode; The main control chip of the electric fan is used to adjust the pulse width modulation carrier in the magnetic field oriented control algorithm of the brushless DC motor to the target preset frequency.

3. The electric fan mosquito repellent method based on dynamic high frequency injection according to claim 2, characterized in that: Before determining the target preset frequency corresponding to the current operating mode of the electric fan based on the current operating mode, the method further includes: When the light intensity of the environment in which the electric fan is located is greater than a preset light intensity value, controlling the current working mode of the electric fan to be a daytime mode; When the light intensity of the environment in which the electric fan is located is not greater than the preset light intensity value, controlling the current working mode of the electric fan to be a night mode; When the humidity of the environment in which the electric fan is located is greater than a preset humidity, the current working mode of the electric fan is controlled to be a strong mode, wherein the strong mode is a mode in which the frequency of the working mode and the night mode are superimposed; When the current time of the environment of the electric fan is the preset early morning period, the current working mode of the electric fan is controlled to be the energy-saving mode.

4. The electric fan mosquito repellent method based on dynamic high frequency injection according to claim 1, characterized in that: The method of injecting a high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor based on the preset frequency by using the dynamic high-frequency injection technology includes: Determining the high-frequency square wave voltage signal based on the preset frequency using a preset high-frequency voltage determination function; injecting the high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor; The expression of the preset high-frequency voltage determination function is: Vd * =Vd base +V hf ·sin(2πF hf t); Vd * is a high-frequency square wave voltage signal, Vd base is the normal flux control voltage signal, V hf is the high frequency amplitude, F hf is the preset frequency.

5. The electric fan mosquito repellent method based on dynamic high frequency injection according to claim 1, characterized in that: The sampling of the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal includes: Based on the six-bridge-arm three-phase drive circuit, sampling the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a q-axis current sampling signal; Amplitude modulation is performed on the q-axis current sampling signal to obtain the current signal, which includes a low-frequency component and a high-frequency component.

6. The electric fan mosquito repellent method based on dynamic high frequency injection according to claim 1, characterized in that: Determining an actual rotor angle of an actual rotor synchronous rotation coordinate system of the brushless DC motor based on the current signal includes: Using a low-pass filter, low-pass filtering the current signal to obtain an error signal; An estimated rotor angle of the estimated rotor synchronous coordinate system corresponding to when the error signal is transformed to 0 is determined, and the estimated rotor angle is used as the actual rotor angle.

7. The electric fan mosquito repellent method based on dynamic high frequency injection according to claim 1, characterized in that: The step of controlling the brushless DC motor to generate an ultrasonic mosquito repellent signal based on the actual rotor angle includes: Based on the actual rotor angle, the angle and speed of the brushless DC motor are updated through a phase-locked loop to generate an ultrasonic mosquito repellent signal.

8. An electric fan mosquito repellent device based on dynamic high frequency injection, characterized in that: include: a driving module, configured to drive the brushless DC motor of the electric fan to rotate the fan blades, and adjust the pulse width modulation carrier in the field oriented control algorithm of the brushless DC motor to a preset frequency; an injection module, configured to inject a high-frequency square wave voltage signal into the d-axis of the estimated rotor synchronous rotating coordinate system of the brushless DC motor based on the preset frequency using a dynamic high-frequency injection technology; a sampling module, configured to sample the q-axis current of the estimated rotor synchronous rotating coordinate system to obtain a current signal; a determination module, configured to determine an actual rotor angle of an actual rotor synchronous rotation coordinate system of the brushless DC motor based on the current signal; A control module is used to control the brushless DC motor to generate an ultrasonic mosquito repellent signal based on the actual rotor angle.

9. An electric fan device, characterized in that: The method comprises a processor and a memory, wherein the memory is used to store a computer program, and when the computer program is executed by the processor, the electric fan mosquito repelling method based on dynamic high-frequency injection as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that It stores a computer program, which, when executed by a processor, implements the electric fan mosquito repelling method based on dynamic high-frequency injection as claimed in any one of claims 1 to 7.

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