Three-phase micromotor fan module, portable fan and drive axle circuit

Abstract

The invention discloses a three-phase micromotor fan module, a portable fan and a drive axle circuit, the portable fan comprises a shell, a power supply circuit, a controller, the drive axle circuit, a three-phase micromotor and fan blades, the power supply circuit, the controller, the drive axle circuit, the three-phase micromotor and the fan blades are installed in the shell, the fan blades are connected with the three-phase micromotor, and the power supply circuit comprises a rechargeable battery. The power supply circuit is connected with a power supply end of the controller and a power supply bus of the drive axle circuit, a control pin of the controller is connected with a controlled end of the drive axle circuit, and the drive axle circuit is connected with the three-phase micromotor. And the controller is used for outputting a control signal to control the drive axle circuit to generate sine wave three-phase alternating current to drive the three-phase micromotor to start, stop or change speed. The drive axle circuit is directly controlled by the controller, so that a drive chip of the drive axle circuit is omitted, and the cost is saved; and on the other hand, based on three-phase current driving of smoother sine waves, compared with square wave driving, the noise and power consumption of the three-phase micromotor are reduced, and the cruising ability is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a three-phase micromotor blower module for a portable fan, a portable fan based on a three-phase micromotor, and a drive bridge circuit for the three-phase micromotor blower module or the portable fan. Background Art

[0002] Anyone who has used a portable fan will know that the motor speed of a portable fan is relatively slow, the wind speed and air volume are limited, and the vibration and noise are also large, which results in users being unable to obtain the best comfort experience under different environments and needs.

[0003] Because the existing ones generally use single-phase motors, in contrast, the operating speed of three-phase motors can range from tens of thousands to hundreds of thousands of revolutions per minute (RPM). However, since these devices require strong power support, three-phase motors are usually powered by AC power, with a voltage range of 110V to 240V to ensure that the motor can provide stable high-speed output. In addition, the manufacturing cost of high-speed motors is relatively high, generally ranging from tens of yuan to hundreds of yuan. Therefore, the application areas of three-phase motors mainly involve industrial equipment, power tools, aerospace, and automobiles. For example, high-speed motors are required in machine tools in industrial equipment to improve production efficiency and processing accuracy, and automobiles need high-speed motors to rotate at high speed to improve power output and fuel efficiency.

[0004] Before 2022, there was no precedent in the entire industry for applying three-phase motors to small portable fans. This is due to the high cost and high power consumption characteristics of high-speed motors, which are inconsistent with the low cost and low power consumption requirements of small portable fans. It was not until 2023 that the applicant promoted the application of three-phase motors to portable fans for the first time, and was highly recognized by consumers at home and abroad, while driving the rapid development of the entire industry. However, from 2023 to the present, whether it is the applicant's products or imitations of peers, square waves are used to drive when using three-phase motors. Square wave drive has obvious technical defects, loud noise, obvious jitter, and the sharp sound of the motor and its shaft is particularly obvious. Therefore, the inventor of this application has been trying to solve the mixed noise problem of square wave drive.

[0005] In two years, the applicant and its inventor investigated the entire motor industry, such as Dyson, Lefen, and other leading motor fan companies, as well as Dongguan Air Cooling, Zhongqu Motor, Hengchi Motor, DJI Innovations, and Dechang Motor. The research found that there was a great lack of research and development in the miniaturization of three-phase motors, and there was no in-depth research on motor noise. Micromotors and their control technology stagnated, especially the handheld portable dust blowers and handheld fans on the market, which made noises disturbing, and the battery life could only last for less than 20 minutes. Especially for fan equipment using three-phase motors, the whistling sound after starting can be transmitted to a range of about 100 meters. Even for drones as powerful as DJI, when flying in the sky, the noise of the airflow and the roar of the motor are believed to be deeply experienced by everyone who has come into contact with them. Obviously, the technology of three-phase motors in micromotors needs to be developed urgently, especially how to control the drive of three-phase motors in micromotors, and new application technologies are urgently needed. Summary of the invention

[0006] The embodiments of the present application provide a three-phase micromotor blower module for a portable fan, a portable fan based on a three-phase micromotor, and a drive bridge circuit for the three-phase micromotor blower module or the portable fan to solve the above-mentioned technical problems.

[0007] A first aspect of an embodiment of the present application provides a three-phase micromotor blower module for a portable fan, wherein the three-phase micromotor blower module comprises a drive bridge circuit, a three-phase micromotor and fan blades, wherein the fan blades are connected to the three-phase micromotor, and the three output ends of the drive bridge circuit are connected to the three electrodes of the three-phase micromotor, wherein the drive bridge circuit is used to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor to start, stop or change speed.

[0008] In some embodiments, the driving bridge circuit includes three driving bridge arms, each of the driving bridge arms includes an upper bridge arm and a lower bridge arm connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus, and the three series nodes of the three driving bridge arms constitute the three output ends of the driving bridge circuit, and the controlled ends of the three upper bridge arms and the controlled ends of the three lower bridge arms are respectively used to connect to the six control pins of the portable fan controller.

[0009] In some embodiments, each of the upper bridge arms includes a first switch tube, and each of the lower bridge arms includes a second switch tube. The first switch tube and the second switch tube are connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus. A series node between the first switch tube and the second switch tube constitutes an output end of the drive bridge circuit.

[0010] In some embodiments, each of the upper bridge arms also includes a third switch tube, the control end of the first switch tube is connected to the first end of the third switch tube, the second end of the third switch tube is grounded, and the control end of the third switch tube constitutes the controlled end of the upper bridge arm.

[0011] In some embodiments, the output voltage of the portable fan is 3V to 4.2V or 6V to 8.4V, the portable fan has one, two or more rechargeable batteries, and the three-phase micromotor includes an outer rotor three-phase micromotor, so as to improve the efficiency of the use of the rechargeable battery through the large-torque outer rotor three-phase micromotor and thus increase the battery life during portable use.

[0012] A second aspect of an embodiment of the present application provides a portable fan based on a three-phase micromotor, the portable fan comprising a shell, and a power supply circuit, a controller, a drive bridge circuit, a three-phase micromotor and fan blades installed in the shell, the fan blades being connected to the three-phase micromotor, the power supply circuit comprising a rechargeable battery, the power supply circuit being connected to the power supply end of the controller and the power supply bus of the drive bridge circuit, the control pin of the controller being used to be connected to the controlled end of the drive bridge circuit, the three output ends of the drive bridge circuit being connected to the three electrodes of the three-phase micromotor, the controller being used to output a control signal to control the drive bridge circuit to generate a sinusoidal or square wave three-phase alternating current to drive the three-phase micromotor to start, stop or change speed.

[0013] In some embodiments, the drive bridge circuit includes three drive bridge arms, each of the drive bridge arms includes an upper bridge arm and a lower bridge arm connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus, and the three series nodes of the three drive bridge arms constitute the three output ends of the drive bridge circuit, and the controlled ends of the three upper bridge arms and the controlled ends of the three lower bridge arms are used to be respectively connected to the six control pins of the controller.

[0014] In some embodiments, each of the upper bridge arms includes a first switch tube, and each of the lower bridge arms includes a second switch tube. The first switch tube and the second switch tube are connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus. A series node between the first switch tube and the second switch tube constitutes an output end of the drive bridge circuit. A control end of the first switch tube is used to connect to a control pin of the controller, and a control end of the second switch tube is used to connect to a control pin of the controller.

[0015] In some embodiments, each of the upper bridge arms also includes a third switch tube, the control end of the first switch tube is connected to the first end of the third switch tube, the second end of the third switch tube is grounded, and the control end of the third switch tube constitutes the controlled end of the upper bridge arm.

[0016] In some embodiments, the portable fan includes a three-phase micromotor fan module, and the three-phase micromotor fan module includes the drive bridge circuit, the three-phase micromotor and the fan blades.

[0017] In some embodiments, it also includes:

[0018] An input module, the input module is connected to the controller, and the input module is used to generate an input signal to the controller under the operation of a user;

[0019] A detection circuit, which is connected to the controller, the drive bridge circuit and the three-phase micromotor and is used to detect and output working electrical parameters of the three-phase micromotor and the drive bridge circuit;

[0020] The controller is also used to modulate the control signal according to the input signal and the working electrical parameter to adjust the three-phase alternating current, thereby achieving speed regulation, starting or stopping of the three-phase micromotor.

[0021] In some embodiments, the detection circuit comprises:

[0022] A voltage detection circuit is connected to the positive electrode of the power supply bus, and is used to detect the power supply voltage of the power supply circuit and output a voltage detection signal;

[0023] A current detection circuit is connected to the negative pole of the power supply bus, and is used to detect the working current of the three-phase micro motor and output a current detection signal;

[0024] The back electromotive force detection circuit is connected to the three output terminals of the driving bridge circuit and is used for detecting and outputting the back electromotive force of the three-phase micro motor.

[0025] In some embodiments, the detection circuit further includes an overcurrent protection circuit, which is connected to the negative pole of the power supply bus and is used to output an overcurrent trigger signal when the working current of the three-phase micromotor reaches an overcurrent threshold;

[0026] The controller is also used to control the drive bridge circuit to shut down the output of the three-phase electricity according to the overcurrent trigger signal.

[0027] In some embodiments, the current detection circuit includes:

[0028] A first sampling resistor is connected in series to the negative electrode of the power supply bus between the power supply circuit and the driving bridge circuit; and

[0029] A first differential amplifier circuit, wherein a positive input terminal and a negative output terminal of the first differential amplifier circuit are respectively connected to two ends of the first sampling resistor, and an output terminal of the first differential amplifier circuit is connected to the controller.

[0030] In some embodiments, the current detection circuit includes:

[0031] Two second sampling resistors are respectively connected in series to one end of the negative electrode of the power supply bus to which any two driving bridge arms of the driving bridge circuit are connected; and

[0032] Two second differential amplifier circuits, the two second differential amplifier circuits are respectively connected to the two second sampling resistors, and the output ends of the two second differential amplifier circuits are connected to the controller;

[0033] Wherein, the positive input terminal and the negative output terminal of each second differential amplifier circuit are respectively connected to the two ends of the corresponding second sampling resistor.

[0034] In some embodiments, the current detection circuit includes:

[0035] Three second sampling resistors are respectively connected in series to one end of the negative electrode of the power supply bus to which the three driving bridge arms of the driving bridge circuit are connected; and

[0036] three second differential amplifier circuits, the three second differential amplifier circuits are respectively connected to the three second sampling resistors, and the output ends of the three second differential amplifier circuits are connected to the controller;

[0037] Wherein, the positive input terminal and the negative output terminal of each second differential amplifier circuit are respectively connected to the two ends of the corresponding second sampling resistor.

[0038] In some embodiments, the back-electromotive force detection circuit includes three back-electromotive force detection sub-circuits, each back-electromotive force detection sub-circuit includes a first voltage divider, a second voltage divider and a filter, the first voltage divider and the second voltage divider are connected in series between the corresponding electrodes of the three-phase micromotor and the ground terminal, the second voltage divider is connected in parallel with the filter, and the series node of the first voltage divider and the second voltage divider is also connected to the back-electromotive force reference pin of the controller and the back-electromotive force detection pin.

[0039] In some embodiments, the input module includes at least one of a button input unit, a touch input unit, and a voice input unit.

[0040] In some embodiments, the output voltage of the rechargeable battery is 3 volts to 4.2 volts or 6 volts to 8.4 volts, the rechargeable battery is 1, 2 or more cells, the power supply circuit also includes a power supply circuit, the positive electrode of the rechargeable battery is used to connect to the positive electrode of the power supply bus of the drive bridge circuit and the positive electrode of the power supply circuit, the negative electrode of the rechargeable battery is used to connect to the negative electrode of the power supply bus of the drive bridge circuit and the negative electrode of the power supply circuit, and the output of the power supply circuit is connected to the power supply end of the controller.

[0041] In some embodiments, the controller is further used to drive the driving bridge circuit to output a sinusoidal three-phase alternating current to the three-phase micromotor based on the output voltage of the rechargeable battery, and control the rotation of the three-phase micromotor in a magnetic field vector control manner.

[0042] A third aspect of an embodiment of the present application provides a three-phase micromotor fan module for any of the above embodiments, or a drive bridge circuit for a portable fan for any of the above embodiments, wherein the drive bridge circuit includes a circuit substrate and three output terminals formed on the circuit substrate, and the three output terminals are respectively connected to three electrodes of the three-phase micromotor of the portable fan, wherein the drive bridge circuit is used to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor to start, stop or change speed.

[0043] The technical effect of the embodiment of the present application is as follows: the technical solution of the embodiment of the present application uses a controller to directly control the drive bridge circuit to generate three-phase alternating current to drive the three-phase micromotor, thereby realizing the start, shutdown or speed change of the three-phase micromotor. On the one hand, the drive chip of the drive bridge circuit is omitted, saving costs, and at the same time realizing low-voltage drive and strategic control of the three-phase micromotor; on the other hand, based on the three-phase micromotor using sinusoidal three-phase current drive, compared with square wave three-phase current drive, the driving current is smoother, which greatly reduces the noise and power consumption of the three-phase micromotor and improves the endurance, providing a high-efficiency, low-noise, adjustable wind speed, long-endurance portable fan solution, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 It is a structural schematic diagram of a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0046] Figure 2 is another structural schematic diagram of a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0047] Figure 3 is another structural schematic diagram of a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0048] Figure 4 This is a circuit diagram of a touch sliding adjustment chip in a portable fan based on a three-phase micro motor provided in the first embodiment of the present application;

[0049] Figure 5 This is a circuit diagram of a touch screen connector in a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0050] Figure 6 This is a schematic diagram of a display interface of a control device in a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0051] Figure 7 This is a circuit diagram of a single-touch touch screen chip in a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0052] Figure 8 is another structural schematic diagram of a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0053] Fig. 9 It is a structural schematic diagram of a voice module in a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0054] Fig.10 It is a circuit diagram of a voice acquisition module in a voice module in a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0055] Fig.11 It is a circuit diagram of a voice recognition module in a voice module in a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0056] Fig.12 It is a structural schematic diagram of a voice output module in a voice module in a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0057] Fig.13 It is a circuit diagram of a voice output module in a voice module in a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0058] Fig.14 is another structural schematic diagram of a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0059] Fig.15 is another structural schematic diagram of a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0060] Fig.16 It is a structural schematic diagram of a driving module in a portable fan based on a three-phase micro motor provided in the first embodiment of the present application;

[0061] Fig.17It is a structural schematic diagram of a motor in a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0062] Fig.18 is a circuit diagram of a driving module in a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0063] Fig.19 is another circuit diagram of a driving module in a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0064] Fig. 20 is another structural schematic diagram of a portable fan based on a three-phase micromotor provided in the first embodiment of the present application;

[0065] Fig.21 This is a structural exploded diagram of an implementation of a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0066] Fig. 22 This is a structural explosion diagram of another implementation of a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0067] Fig.23 It is an exploded view of the first part of the structure of another implementation of a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0068] Fig.24 It is an exploded view of the second part of the structure of another implementation of a portable fan based on a three-phase micro motor provided in Example 1 of the present application;

[0069] Fig.25 It is a third part structural exploded diagram of another implementation manner of a portable fan based on a three-phase micro motor provided in Example 1 of the present application;

[0070] Fig.26 It is a structural schematic diagram of another implementation of a portable fan based on a three-phase micromotor provided in Example 1 of the present application;

[0071] Fig. 27 is a flow chart of a control method for a portable fan provided in Embodiment 2 of the present application;

[0072] Fig.28 This is a schematic diagram of the structure of a portable fan based on a three-phase micromotor provided in one embodiment of the present application;

[0073] Fig.29 This is a schematic diagram of the structure of a driving bridge circuit in a portable fan based on a three-phase micromotor provided in an embodiment of the present application;

[0074] Fig.30 This is a circuit diagram of a driving bridge circuit in a portable fan based on a three-phase micromotor provided in an embodiment of the present application;

[0075] Fig.31 This is a circuit diagram of a driving bridge circuit in a portable fan based on a three-phase micromotor provided in an embodiment of the present application;

[0076] Fig.32 This is a schematic diagram of the structure of a portable fan based on a three-phase micromotor provided in one embodiment of the present application;

[0077] Fig.33 It is a structural schematic diagram of a detection circuit in a portable fan based on a three-phase micromotor provided in an embodiment of the present application;

[0078] Fig.34 This is a circuit diagram of a current detection circuit in a portable fan based on a three-phase micromotor provided in an embodiment of the present application;

[0079] Fig.35 This is a circuit diagram of a current detection circuit in a portable fan based on a three-phase micromotor provided in an embodiment of the present application;

[0080] Fig.36 It is a circuit diagram of a back electromotive force detection circuit in a portable fan based on a three-phase micromotor provided in an embodiment of the present application;

[0081] Some of the reference numerals are as follows:

[0082] 05 / 101, input module; 102, control module; 103, drive module; 04 / 104, three-phase micro motor; 105, speed measurement module; 106, networking module; 107, cloud server; 111, touch module; 112, voice module; 121, voice acquisition module; 122, voice recognition module; 123, voice output module; 1131, power amplifier module; 1132, speaker; 201, manual switch module; 20 2. Wireless module; 203. Atomization module; 204. Refrigeration module; 205. Heating module; 206. Lighting module; 206. Shaking head module; 301. First upper bridge arm switch tube; 302. Second lower bridge arm switch tube; 303. Third upper bridge arm switch tube; 304. Fourth lower bridge arm switch tube; 305. Fifth upper bridge arm switch tube; 306. Sixth lower bridge arm switch tube; 311. First coil; 312. Second coil; 313. Third coil;

[0083] 01. Power supply circuit; 02. Controller; 03. Drive bridge circuit; 06. Detection circuit; 031. First upper bridge arm; 032. First lower bridge arm; 033. Second upper bridge arm; 034. Second lower bridge arm; 035. Third upper bridge arm; 036. Third lower bridge arm; 061. Voltage detection circuit; 062. Current detection circuit; 063. Back electromotive force detection circuit; 0621. First differential amplifier circuit; 0622 / 0623. Second differential amplifier circuit. DETAILED DESCRIPTION

[0084] In order to thoroughly understand the present application, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0085] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0087] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0088] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0089] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0090] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0091] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0092] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0093] Embodiment 1

[0094] Embodiment 1 of the present application provides a portable fan, which solves the problem in the prior art that a mechanical switch is used and the user cannot adjust the wind speed to any level as needed, resulting in a poor user experience.

[0095] Embodiment 1 of the present application provides a portable fan based on a three-phase micro motor, such as Figure 1As shown, it includes: a control module 102, a drive module 103 and a three-phase micromotor 104, wherein the working voltage of the three-phase micromotor 104 is 2 to 18 volts, the working current of the three-phase micromotor 104 is 0.1 to 10 amps, and / or the rated working power of the three-phase micromotor 104 is 0.5 to 100 watts; the control module 102 controls the rated working speed of the three-phase micromotor 104 through the drive module 103 according to the working voltage, working current and / or rated working power, so as to reduce the high speed noise of the three-phase micromotor 104 and control the wind speed to be within a preset wind speed range.

[0096] Among them, this technical solution realizes the low-voltage drive of the three-phase micro motor through the coordinated work of the control module 102 and the drive module 103 to meet the specific needs of the portable fan. Among them, it is necessary to adjust the number of slots and the number of pole pairs to adapt to low-voltage operation, select high-performance core materials to reduce magnetic loss and improve working efficiency under low voltage, set an efficient inverter to convert low-voltage direct current into three-phase alternating current, ensure the stability of the power supply, and avoid voltage fluctuations affecting motor performance.

[0097] Among them, the operating voltage ranges from 2 to 18 volts, the operating current ranges from 0.1 to 10 amperes, and the rated operating power ranges from 0.5 to 100 watts. The design of the three-phase micromotor 104 can provide a more efficient speed and power output at low voltage compared to existing portable fan motors, which is suitable for the needs of portable devices. The control module 102 accurately controls the three-phase micromotor 104 according to the real-time monitored operating voltage, operating current and rated operating power. By adjusting the power supply parameters of the three-phase micromotor 104, the control module 102 can effectively reduce the noise generated when the motor runs at high speed. The control module 102 can also adjust the wind speed of the fan so that it is within a preset wind speed range, which ensures the comfort of use and the stability of the equipment compared to the single-phase low-speed motor. The drive module 103 connects the control module 102 and the three-phase micromotor 104, and converts the instructions of the control module 102 into actual motor drive signals. The drive module 103 adopts efficient inverter technology to convert low-voltage direct current into alternating current suitable for the three-phase micromotor 104, ensuring efficient operation of the motor. Under different working conditions, the drive module 103 adjusts the speed and output power of the motor according to the instructions of the control module 102.

[0098] The technical effect of this embodiment is that this technical solution provides a high-efficiency, low-noise, and adjustable wind speed portable fan solution by combining a control module, a drive module, and a three-phase micromotor. Through low-voltage drive technology and precise control strategy, it not only improves the portability and comfort of the fan, but also effectively improves the overall performance and energy efficiency of the device. This design is suitable for portable fan application scenarios that require high performance and low noise, filling the gap in the application of three-phase micromotors in small portable devices on the market.

[0099] The specific application of this embodiment 1 includes but is not limited to the following implementation methods:

[0100] As an embodiment, when the operating voltage of the three-phase micromotor 104 is 6 to 8.4 volts, the operating current of the three-phase micromotor 104 is 0.12 to 1 amp, and / or the rated operating power of the three-phase micromotor 104 is 0.8 to 9 watts, the control module 102 controls the rated operating speed of the three-phase micromotor 104 to 6000-15000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0101] Among them, the three-phase micromotor 104 is driven by a voltage range of 6-8.4V, which is suitable for power supply by two batteries in series. The working current range is 0.12-1A, ensuring stable operation at different speeds. The power range is 0.8W-9W, which meets the power requirements of the portable fan. The control module 102 monitors the working voltage, current and power of the motor in real time, and adjusts according to these parameters. The control module 102 can accurately control the speed of the motor with an adjustment range of 6000-15000RPM. The drive module 103 converts 6-8.4V DC into three-phase AC and drives the three-phase micromotor 104 through inverter technology. The battery uses 2 batteries in series to provide a stable voltage. The fan has 4 pairs of poles, 12 slots, 5 blades, and 6 guide vanes / impellers.

[0102] As an embodiment, when the operating voltage of the three-phase micromotor 104 is 5.9 to 8.4 volts, the operating current of the three-phase micromotor 104 is 0.5 to 6 amps, and / or the rated operating power of the three-phase micromotor 104 is 5 to 50 watts, the control module 102 controls the rated operating speed of the three-phase micromotor 104 to 20000-80000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0103] Among them, the three-phase micromotor 104 is driven by a voltage range of 5.9-8.4V, which can be 5.9V, 6.0V, 6.5V, 7.2V, ..., 8.4V, suitable for two batteries connected in series to supply power, with an operating current range of 0.5-6A, ensuring stable operation at different speeds, and a power range of 5W-50W, which meets the power requirements of the portable fan. The control module 102 monitors the working voltage, current and power of the motor in real time, and adjusts according to these parameters. The control module 102 can accurately control the speed of the motor, and the adjustment range is 20000-80000RPM. The drive module 103 converts 5.9-8.4V DC into three-phase AC, and drives the three-phase micromotor 104 through inverter technology. The battery uses 2 batteries in series to provide a stable voltage. The number of pole pairs of the fan is 1 pair, the number of slots is 6 slots, the number of blades is 13, and the number of guide vanes / impellers is 6.

[0104] As an embodiment, the operating voltage of the three-phase micromotor 104 is 2 to 5.8 volts, the operating current of the three-phase micromotor 104 is 0.25 to 2 amps, and / or the rated operating power of the three-phase micromotor 104 is 1 to 8 watts. The control module 102 controls the rated operating speed of the three-phase micromotor 104 to 15000-41000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0105] Among them, the three-phase micromotor 104 is driven by a voltage range of 2-5.8V, which can be 2V, 2.1V, 2.5V, 3.7, ..., 4.3V, 5.8V, suitable for two batteries connected in series to supply power, with an operating current range of 0.25-1.8A, ensuring stable operation at different speeds, and a power range of 1W-8W, which meets the power requirements of the portable fan. The control module 102 monitors the working voltage, current and power of the motor in real time, and adjusts according to these parameters. The control module 102 can accurately control the speed of the motor, and the adjustment range is 15000-41000RPM. The drive module 103 converts 2-5.8V DC into three-phase AC and drives the three-phase micromotor 104 through inverter technology. The battery uses 2 batteries in series to provide a stable voltage. The fan has 4 pairs of poles, 9 slots, 9 blades, and 7 guide vanes / impellers.

[0106] As an embodiment, when the working voltage of the three-phase micromotor 104 is 8.5 to 12.6 volts, the working current of the three-phase micromotor 104 is 0.5 to 5 amperes, and / or the rated working power of the three-phase micromotor 104 is 6 to 60 watts, the control module 102 controls the rated working speed of the three-phase micromotor 104 to 25000-85000 RPM / MIN through the driving module 103 according to the working voltage, working current and / or rated working power.

[0107] Among them, the three-phase micromotor 104 is driven by a voltage range of 8.5-12.6V, which can be 8.5V, 9.0V, 10.5V, 12.0V, ..., 12.6V, suitable for three batteries connected in series to supply power, and the operating current range is 0.5-5A, ensuring stable operation at different speeds, and the power range is 6W-60W, which meets the power requirements of the portable fan. The control module 102 monitors the working voltage, current and power of the motor in real time, and adjusts according to these parameters. The control module 102 can accurately control the speed of the motor, and the adjustment range is 25000-85000RPM. The drive module 103 converts 8.5-12.6V DC into three-phase AC, and drives the three-phase micromotor 104 through inverter technology. The battery uses 3 batteries in series to provide a stable voltage. The number of pole pairs of the fan is 1 pair, the number of slots is 6 slots, the number of blades is 13, and the number of guide vanes / impellers is 6.

[0108] As an embodiment, when the operating voltage of the three-phase micromotor 104 is 12 to 18 volts, the operating current of the three-phase micromotor 104 is 0.1 to 1 amp, and / or the rated operating power of the three-phase micromotor 104 is 2 to 16 watts, the control module 102 controls the rated operating speed of the three-phase micromotor 104 to 2000-6000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0109] Among them, the three-phase micromotor 104 is driven by a voltage range of 12-18V, which can be 12V, 12.5V, 14V, 16.8V, ..., 18V, suitable for four batteries connected in series, with an operating current range of 0.1-1A, ensuring stable operation at different speeds, and a power range of 2W-16W, which meets the power requirements of the portable fan. The control module 102 monitors the working voltage, current and power of the motor in real time, and adjusts according to these parameters. The control module 102 can accurately control the speed of the motor, and the adjustment range is 2000-6000RPM. The drive module 103 converts 12-16.8V DC into three-phase AC, and drives the three-phase micromotor 104 through inverter technology. The battery uses 4 batteries in series to provide a stable voltage. The number of pole pairs of the fan is 4 pairs, the number of slots is 6 slots, the number of blades is 9, and the number of guide vanes / impellers is 10.

[0110] As an embodiment, this embodiment provides a portable fan, such as Figure 2As shown, it includes: an input module 101, a control module 102, a drive module 103 and a three-phase micro motor 104 connected in sequence, the drive module 103 includes a first bridge arm, a second bridge arm and a third bridge arm, and the midpoint of each bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube on both sides, and the midpoint of each bridge arm is connected to a phase coil of the three-phase micro motor 104; the input module 101 outputs a wind speed adjustment control signal according to a user instruction, the control module 102 generates a PWM control signal according to the wind speed adjustment control signal, and controls the switch tube of each bridge arm through the PWM control signal to adjust the speed of the three-phase micro motor 104.

[0111] The input module 101 also outputs a switch signal according to a user instruction, the control module 102 generates a switch control signal according to the switch signal, and controls the switch tube of each bridge arm through the switch control signal to drive the three-phase micro motor 104 to start or stop running.

[0112] Among them, when the user's instruction is to turn on the fan, the input module 101 outputs a switch signal according to the user's instruction. When the user's instruction is to adjust the fan speed, the input module 101 outputs a wind speed adjustment control signal according to the user's instruction. The user can input the control instruction in a variety of ways according to the type of the input module 101. For example, the input module 101 can input the instruction through touch, voice or other input methods. When the input module 101 is a touch module 111, when the input module 101 detects a touch action, a switch signal is generated. When the input module 101 detects a sliding action, a wind speed adjustment signal is generated. When the input module 101 is a voice module 112, the input module 101 captures the user's voice signal and converts it into a switch signal and a wind speed adjustment control signal. When the input module 101 is a networking module 106, it receives a remote control signal or a wind speed adjustment parameter set by the user. The input module 101 can also be a multifunctional input module, and various functions such as timing control, lighting control, head shaking control, spray control, and refrigeration control are realized through the input module 101. The timing function refers to the user setting the timing switch time through the touch module 111, or remotely setting the timing function through the voice module 112 and the networking module 106. Light control refers to the user adjusting the light switch state, brightness and color through the touch module 111, or remotely controlling the light through the voice module 112 and the networking module 106. The shaking head function refers to the user setting the shaking head angle and speed of the fan through the touch module 111, or remotely controlling the shaking head function through the voice module 112 and the networking module 106. The spray function refers to the user turning on or adjusting the spray volume through the touch module 111, or remotely controlling the spray function through the voice module 112 and the networking module 106. The cooling function refers to the user adjusting the cooling intensity of the fan through the touch module 111, or remotely controlling the cooling function through the voice module 112 and the networking module 106. The input module realizes multiple function controls, allowing users to use and adjust the fan more flexibly to meet the needs of different usage scenarios.

[0113] The input module 101 and the control module 102 are connected via wired or wireless means, and the input module is disposed on a housing of a portable fan or other electronic device.

[0114] Among them, the input module 101 and the control module 102 are connected by wire, for example, by an I2C cable, an SPI cable, a UART cable, a GPIO interface, a USB interface, a CAN bus, an I2S interface, and an ADC interface. The I2C cable (Inter-Integrated Circuit) is a serial communication protocol, which is commonly used to connect low-speed peripheral devices (such as touch modules) to the mainboard, and uses two wires (SDA and SCL) for data transmission and clock synchronization. The SPI cable (Serial Peripheral Interface) is a high-speed synchronous serial communication protocol, which uses four wires (MISO, MOSI, SCK and SS) for data transmission. The UART cable (Universal Asynchronous Receiver-Transmitter) is an asynchronous serial communication protocol, which uses two wires (Tx and Rx) for data transmission. The GPIO interface (General-Purpose Input / Output) is a general-purpose digital signal input / output interface that can be configured as an input or output mode. The USB interface (Universal Serial Bus) is a general-purpose high-speed serial communication interface that supports plug-and-play and hot-swap. CAN bus (Controller Area Network) is a serial communication protocol for industrial automation with high reliability and real-time performance. I2S interface (Integrated Interchip Sound) is a serial bus standard for audio data transmission. ADC interface (Analog-to-Digital Converter) is an interface for converting analog signals into digital signals. Signal transmission between input module 101 and control module 102 is achieved through wireless communication technologies such as Wi-Fi, Bluetooth, Zigbee, etc. The input module 101 is directly integrated on the housing of the portable fan and is suitable for occasions where the user wants to operate directly on the fan, such as adjusting the wind speed through a touch screen or turning the fan on and off with a button. The input module 101 can also be separated from the portable fan and installed on other electronic devices (such as smart phones, tablet computers, smart watches, etc.), and connected to the control module of the fan by wireless means, making the control of the portable fan more flexible and convenient, and the user can remotely control it through existing electronic devices. Among them, the wireless module can be a Bluetooth module, a Wi-Fi module, an infrared module, a 433MHz wireless module, and can also be the following wireless modules: Zigbee module, Z-Wave module, LoRa (Long Range) module, NFC (Near Field Communication), 2.4GHz dedicated wireless module, 5G, etc.The control module 102 receives the signal of the input module 101, and performs signal processing, generates a switch control signal according to the switch signal, which is used to control the start or stop of the three-phase micro motor 104, and calculates and adjusts the control signal of the portable fan according to the wind speed adjustment signal. The control signal includes but is not limited to PWM (pulse width modulation), PPM (pulse position modulation), data protocol or other custom protocols. Among them, PWM signal is a commonly used control method, which adjusts the speed of the motor by changing the duty cycle of the signal (i.e., the ratio of the high level time to the period). The PPM signal transmits information by changing the position of the pulse within a period. The data protocol can be a standard communication protocol (such as I2C, SPI, UART) or a custom communication protocol for transmitting more complex control instructions. The custom protocol designs a specific control signal format and transmission method according to specific application requirements. If the input module 101 is a voice module 112, the control module 102 generates a switch control signal and a PWM control signal according to the switch signal and the wind speed adjustment control signal. If the input module 101 is a networking module 106, the control module 102 generates a corresponding control signal according to the remote control signal. The driving module 103 is composed of three bridge arms, each of which includes an upper bridge arm switch tube and a lower bridge arm switch tube, which are connected to the phase coils of the three-phase micro motor 104. The control module 102 controls the switch tube of each bridge arm through a switch control signal to start or stop the three-phase micro motor 104. The switch tube of each bridge arm is controlled by a PWM control signal to adjust the speed of the three-phase micro motor 104. The start, stop and speed of the motor can be controlled by a six-step commutation method. Only two MOS tubes are turned on at each moment to form an effective current path to drive the motor. By controlling the three bridge arms (each bridge arm has two MOS tubes), six commutation states are realized to drive the motor. Each commutation state corresponds to a pair of turned-on MOS tubes, and the remaining MOS tubes remain closed. The three-phase micro motor 104 receives the signal of the driving module 103, starts to operate, and provides the corresponding wind speed.

[0115] The technical effect of the first embodiment of the present invention is that: through the switch signal and wind speed adjustment control signal output by the input module, the control module can generate a switch control signal and a PWM control signal, and the user can adjust the operating status and wind speed of the fan according to needs to achieve flexible wind speed adjustment; compared with the traditional mechanical switch method, this technical solution allows the user to select the appropriate wind speed according to specific needs, enhances the convenience and comfort of use, and improves the user experience.

[0116] As an implementation method, Figure 3As shown, when the input module 101 is a touch module 111, the touch module 111 outputs a switch signal when detecting a touch action, and the control module 102 generates a switch control signal according to the switch signal; when the touch module 111 detects a sliding action, it outputs a wind speed adjustment signal, and the control module 102 calculates the PWM signal duty cycle according to the wind speed adjustment signal, and generates a PWM control signal according to the PWM signal duty cycle.

[0117] Among them, the touch module 111 detects the user's touch and sliding action. When the user touches the touch module 111, the touch module 111 detects the touch action and generates a switch signal. When the user slides on the touch module 111, the touch module 111 detects the sliding parameter and generates a wind speed adjustment signal. The control module 102 receives and processes the switch signal, generates a switch control signal, and is used to control the start or stop of the three-phase micro motor 104. The control module 102 receives and processes the wind speed adjustment signal, and calculates the required PWM signal duty cycle according to the wind speed adjustment signal.

[0118] Among them, the control module 102 calculates the PWM signal duty cycle using different calculation methods according to different sliding parameters, and the sliding parameters may include the following: sliding distance: the distance that the user slides the finger on the touch area; sliding speed: the speed at which the user slides the finger; sliding direction: the direction in which the user slides the finger (such as up and down, left and right); sliding position: the starting and ending positions of the user's sliding finger on the touch area.

[0119] Among them, taking the sliding distance as the main parameter, the specific steps for calculating the duty cycle are as follows:

[0120] When the user starts sliding on the touch area, the starting position is recorded. When the user finishes sliding on the touch area, the ending position is recorded, and the distance between the starting position and the ending position is used as the sliding distance. For example, let the starting position be P1 and the ending position be P2. The sliding distance D can be expressed as: D=P2-P1. Define the maximum distance Dmax that the user may slide on the touch area, compare the actual sliding distance D with the maximum sliding distance Dmax, calculate the sliding distance ratio R, and ensure that R is between 0 and 1. Set the minimum and maximum values ​​of the PWM signal duty cycle. For example, the minimum value is 0% and the maximum value is 100%. According to the sliding distance ratio, the corresponding PWM signal duty cycle is calculated according to the corresponding relationship, and the PWM control signal is output according to the PWM signal duty cycle. The generated PWM control signal is sent to the drive module 103 to adjust the rotation speed of the three-phase micromotor 104 to achieve a change in wind speed.

[0121] Among them, taking the sliding time as the main parameter, the specific steps for calculating the duty cycle are as follows:

[0122] When the user slides on the touch panel, the touch module 111 detects the sliding action and records the start and end time of the sliding. The touch module 111 transmits the sliding time to the control module 102, and the control module 102 calculates the normalized sliding time according to the sliding time and generates the corresponding PWM duty cycle. The control module 102 sends the PWM signal to the drive module 103, and the drive module 103 controls the speed of the three-phase micro motor 104 by adjusting the switching frequency and duty cycle of the switch tube.

[0123] Among them, taking the click position as the main parameter, the specific steps for calculating the duty cycle are as follows:

[0124] When the user clicks a certain position on the touch module 111, the touch module 111 detects the coordinates of the click position (such as X, Y coordinates), and the touch module 111 uses the click position coordinates as click parameters to generate a wind speed adjustment signal. According to the different click positions, the control module 102 calculates the required PWM signal duty cycle. For example, the touch area is divided into multiple areas, and each area corresponds to a different wind speed gear. Assume that the touch area of ​​the touch module 111 is divided into five equal areas, and clicking each area corresponds to a wind speed gear: area 1 (leftmost) is a low wind speed gear, area 2 (middle) is a medium wind speed gear, and area 5 (rightmost) is a high wind speed gear. The user clicks the rightmost side of the touch area (area 5), ​​and the touch module 111 detects the click position coordinates and generates a corresponding wind speed adjustment signal. The control module 102 receives the wind speed adjustment signal and calculates the PWM signal duty cycle required for the corresponding high wind speed gear according to the click position (area 5). The control module 102 generates a PWM control signal and sends it to the drive module 103. The driving module 103 adjusts the rotation speed of the three-phase micro motor 104 to a high wind speed gear by controlling the conduction time of the upper bridge arm switch tube and the lower bridge arm switch tube.

[0125] As an implementation method, the touch module 111 can use a touch sliding adjustment chip, which includes multiple contacts. When the user operates the fan through the touch screen, the touch sliding adjustment chip detects the touch action through these contacts. If the pressure caused by the touch action is detected, the touch module 111 generates a switch signal. The touch sliding adjustment chip transmits the switch signal to the control module 102. After receiving the switch signal, the control module 102 generates a switch control signal to control the switch tube in the drive module 103, thereby realizing the start or stop of the three-phase micromotor 104, that is, turning on or off the fan. In addition to detecting the touch action, the touch sliding adjustment chip can also detect the sliding parameters of the user on the touch screen, including sliding gestures, sliding distance, sliding speed, number of sliding times and sliding time. These parameters are transmitted to the control module 102 through the touch module 111. The control module 102 generates a corresponding PWM control signal according to a preset logic to adjust the wind speed of the portable fan. The control module 102 generates a corresponding PWM control signal according to the sliding parameter. The PWM control signal is used to control the switch tube in the driving module 103 to adjust the rotation speed of the three-phase micro motor 104, thereby realizing the adjustment of the wind speed.

[0126] Among them, there are multiple contacts on the touch sliding adjustment chip. When the user performs a touch sliding operation on the contact point, the chip will detect the touch action and sliding parameters (such as sliding distance, sliding speed, etc.). The sliding parameters detected by the chip include the distance and speed of the user sliding on the touch screen. These parameters reflect the degree to which the user wants to adjust the wind speed. According to the detected sliding parameters, the touch sliding adjustment chip generates a wind speed adjustment control signal. After the control module receives the wind speed adjustment control signal, it calculates the corresponding PWM signal duty cycle according to the size of the signal. The higher the duty cycle, the higher the motor speed; the lower the duty cycle, the lower the motor speed. The control module sends the generated PWM signal to the drive module, and the drive module controls the motor speed. By adjusting the duty cycle of the PWM signal, the motor speed is accurately controlled, thereby adjusting the fan's wind speed.

[0127] As an example, Figure 4 As shown, U5 is a touch chip, and pins PA0 to PA4 of the touch chip U5 can be connected to the control module 102 through the above-mentioned connection method. The touch chip U5 includes at least contacts K2, K3, K4, K5, K6 and K7. Each contact can detect touch actions, and different contacts can cooperate to detect sliding parameters such as sliding gestures, sliding distance, sliding speed, number of sliding times and sliding time.

[0128] The technical effect of this embodiment is that compared with the traditional portable fan which has only one mechanical switch to control the gear position, a more diversified control method is realized through the touch module. The user can not only turn on and off the fan by simply touching it, but also flexibly adjust the wind speed by sliding. The application of the touch sliding adjustment chip makes the operation of the fan more convenient and intuitive. The user does not need to repeatedly press the mechanical switch, but can easily control the switch and wind speed of the fan by touching and sliding, which improves the user's operating efficiency and use experience. The control module generates an accurate PWM control signal according to the detected sliding parameters, which can realize the precise control of the fan wind speed. The user can flexibly adjust the wind speed according to the needs to obtain a more comfortable use experience.

[0129] As a second implementation of the touch module 111, the touch module 111 can be a touch screen chip, including single-way touch, multi-way touch, touch screen, etc. The touch sliding screen chip includes a switch area and a sliding area. The touch sliding screen chip generates a switch touch signal through the switch area, and generates a corresponding wind speed adjustment control signal when a sliding parameter is detected through the sliding area.

[0130] Among them, the touch module 111 of the portable fan adopts a touch screen chip, which includes a switch area and a sliding area. When the user touches the switch area, the touch screen chip will detect the touch action and generate a switch signal. When the user performs a sliding operation in the sliding area, the touch screen chip will detect the sliding parameter and generate a corresponding wind speed adjustment control signal. The touch module 111 sends the generated switch signal and wind speed adjustment control signal to the control module 102. After receiving the switch signal, the control module 102 generates a switch control signal, and controls the switch tube of each bridge arm through the signal to start or stop the motor. After receiving the wind speed adjustment control signal, the control module 102 generates a PWM control signal, and controls at least one switch tube of each bridge arm through the signal to adjust the rotation speed of the three-phase micro motor 104 to achieve wind speed adjustment.

[0131] As an example, Figure 5 As shown, pins 5 to 9 of the touch screen connector P2 are connected to the touch screen, and pins 12 to 15 of the touch screen connector P2 can be connected to the control module 102 in the above-mentioned connection manner. Figure 6 As shown, a control interface is displayed on the mobile terminal screen. The control interface includes a power on / off button, a speed adjustment button, a timed off button, an air purification button, an ambient light button, and a fan abnormality reminder. Different functions are achieved by clicking the buttons. This is only an example and is not a limitation of the present application.

[0132] The technical effect of this implementation is that through the touch screen chip, the user can easily realize the switch control and wind speed adjustment of the fan. The operation is simple and intuitive, which meets the various needs of users. The touch screen chip can realize flexible switch and wind speed adjustment through the detection of the switch area and the sliding area. The user can accurately control the wind speed of the fan according to the needs, providing a more comfortable use experience. The use of the touch screen enhances the technological and modern sense of the portable fan, improves the user experience, and makes the product more competitive in the market.

[0133] As a third embodiment of the touch module 111, the touch module 111 includes multiple single-contact touch chips connected in parallel. The touch module 111 generates a switch touch signal when a touch action is detected through any one contact, and generates a corresponding wind speed adjustment control signal when sliding parameters are detected through multiple contacts.

[0134] Among them, the touch module 111 of the portable fan includes multiple single-contact touch chips or multiple-contact touch integrated into one chip. When the user touches any single-contact touch chip, the chip will generate a switch signal; when the user slides on the touch screen, the multiple single-contact touch chips will detect the sliding parameters and generate corresponding wind speed adjustment control signals. The touch module 111 sends the generated switch touch signal and wind speed adjustment control signal to the control module 102. After receiving the switch touch signal, the control module 102 generates a conduction level signal, and controls the switch tube of each bridge arm through the signal to start or stop the motor. After receiving the wind speed adjustment control signal, the control module 102 generates a PWM control signal, and controls at least one switch tube of each bridge arm through the signal to adjust the rotation speed of the three-phase micro motor 104 to achieve wind speed adjustment.

[0135] As an example, Figure 7 As shown, U3 is a single-contact touch chip, which is connected to the control module 102 via pin 1 through resistor R10, and pin 3 of the single-contact touch chip U3 is connected to a contact K1 via resistor R11. The above functions can be achieved by connecting multiple single-contact touch chips in parallel.

[0136] The technical effect of this embodiment is that through multiple parallel single-contact touch chips, users can easily realize the switch control and wind speed adjustment of the fan, which is simple and intuitive to operate and meets the various needs of users. The touch sliding adjustment chip can realize flexible wind speed adjustment through the detection of multiple single contacts. Users can accurately control the wind speed of the fan as needed, providing a more comfortable use experience. The use of touch screen enhances the sense of technology and modernity of portable fans, improves user experience, and makes the product more competitive in the market.

[0137] As an implementation method, Figure 8As shown, when the input module 101 is the voice module 112, the voice module 112 captures the user's voice signal and converts the voice signal into a switch signal and a wind speed adjustment control signal, and the control module 102 generates a switch control signal and a PWM control signal according to the switch signal and the wind speed adjustment control signal.

[0138] Among them, the user issues a voice command through the voice module 112, such as "turn on the fan", "turn off the fan" or "increase the wind speed". The microphone of the voice module 112 captures the user's voice signal. The voice module 112 transmits the captured voice signal to the voice recognition unit, and the voice recognition unit converts the voice signal into a corresponding switch signal and a wind speed adjustment control signal. The voice module 112 sends the switch signal and the wind speed adjustment control signal to the control module 102. The control module 102 generates a corresponding control signal according to the switch signal and the wind speed adjustment control signal: if the instruction is "turn on the fan" or "turn off the fan", the instruction corresponds to the switch signal, and the control module 102 generates a switch control signal; if the instruction involves wind speed adjustment "increase the wind speed", the instruction corresponds to the wind speed adjustment control signal, and the control module 102 generates a PWM control signal. The control module 102 controls the switch tube in the driving module 103 through the switch control signal to drive the three-phase micro motor 104 to start or stop. The control module 102 adjusts the duty cycle of the PWM signal according to the wind speed adjustment control signal to generate a corresponding PWM control signal. The control module 102 sends a PWM control signal to the driving module 103, and controls the rotation speed of the three-phase micro motor 104 by adjusting the switching frequency and duty cycle of the upper bridge arm or the lower bridge arm switch tube.

[0139] The technical effect of this implementation is that the user does not need to manually operate the mechanical switch or touch panel, and can conveniently control the portable fan through voice commands, which makes the operation more convenient. The speed of the motor is controlled by PWM signals, ensuring the smoothness and accuracy of the wind speed adjustment, so that users can get a better user experience.

[0140] For the voice module 112, as an implementation method, Fig. 9 As shown, the voice module 112 includes a voice acquisition module 121, a voice recognition module 122 and a voice output module 123. The voice recognition module 122 is respectively connected to the voice acquisition module 121, the voice output module 123 and the control module 102; the voice acquisition module 121 captures the user's voice signal, the voice recognition module 122 converts the voice signal into a switch signal and a wind speed adjustment control signal and sends it to the control module 102, and the voice recognition module 122 also controls the voice output module 123 to output or not output the execution result according to the feedback result of the control module 102.

[0141] Among them, the voice acquisition module 121 is responsible for capturing the user's voice signal, which is usually composed of a microphone and is used to convert the user's voice input into an electrical signal form. The voice recognition module 122 converts the captured voice signal into a switch signal and a wind speed adjustment control signal, and uses voice recognition algorithms and technologies to process the voice signal into a recognizable signal instruction, which can be parsed and executed by the subsequent control module 102. Specifically, the voice recognition module 122 preprocesses the captured voice signal, including signal amplification, filtering, and denoising, to ensure the accuracy and stability of subsequent processing. The preprocessed voice signal is converted into a digital feature vector. This step can use technologies such as MFCC (Mel Frequency Cepstral Coefficients) to extract features from the voice signal. Based on a large amount of labeled voice data, the voice recognition model is trained. Commonly used technologies include hidden Markov models (HMM), deep learning models (such as recurrent neural networks RNN, long short-term memory networks LSTM), etc., and the feature vector is input into the voice recognition model for recognition and decoding. The model maps the feature vector sequence to an instruction sequence. The decoded instruction is output. The voice type may be to indicate whether the fan is turned on or off, for example: turning on the fan corresponds to 0x01, and turning off the fan corresponds to 0x02. The voice type may be to indicate the speed adjustment of the fan, for example: increasing the wind speed corresponds to 0x03, and reducing the wind speed corresponds to 0x04. The voice type may be a specific wind speed level, and the wind speed level is directly set. For example: low speed corresponds to 0x10, medium speed corresponds to 0x11, and high speed corresponds to 0x12. In addition, other texts may be used to replace the above-mentioned turning on the fan, turning off the fan, increasing the wind speed, and reducing the wind speed. The signal output by the voice module 112 may be a single-byte or multi-byte data packet, depending on the complexity of the instruction and the design of the system. For example: a single-byte signal may be 0x01 (indicating turning on the fan), and a multi-byte signal may be 0x01 0x02 (indicating turning on the fan and setting it to the second-level wind speed).

[0142] As an example, the user says "turn on the fan", the voice module 112 recognizes the instruction and generates a signal 0x01, and the voice module 112 sends the signal 0x01 to the control module 102. The user says "increase the fan speed", the voice module 112 recognizes the instruction and generates a signal 0x03, and the voice module 112 sends the signal 0x03 to the control module 102. The user says "adjust the fan speed to medium speed", the voice module 112 recognizes the instruction and generates a signal 0x11, and the voice module 112 sends the signal 0x11 to the control module 102.

[0143] As an example, Fig.10 and Fig.11As shown, the voice collection module 121 includes a microphone MIC, a resistor R23, a resistor R24, a capacitor C27 and a capacitor C28. The first end of the microphone MIC is respectively connected to the second end of the resistor R24 ​​and the second end of the capacitor R27, and the second end of the microphone MIC is respectively connected to the second end of the resistor R23 and the second end of the capacitor R28. The voice recognition module 122 includes a voice recognition chip U1, a pin 1 of the voice recognition chip U1 is connected to one end of the capacitor C21, a pin 2 of the voice recognition chip U1 is respectively connected to one end of the capacitor C20 and one end of the resistor R20, the other end of the capacitor C20 and the anode of the voltage regulator tube D1 are connected to the ground, the other end of the resistor R20 and the cathode of the voltage regulator tube D1 are connected to a high level, a pin 3 of the voice recognition chip U1 is connected to one end of the capacitor C24, a pin 4 of the voice recognition chip U1 is connected to one end of the capacitor C25, and the voice recognition module 122 includes a voice recognition chip U1, a pin 1 of the voice recognition chip U1 is connected to one end of the capacitor C21, a pin 2 of the voice recognition chip U1 is respectively connected to one end of the capacitor C20 and one end of the resistor R20, the other end of the capacitor C20 and the anode of the voltage regulator tube D1 are connected to the ground, the other end of the resistor R20 and the cathode of the voltage regulator tube D1 are connected to a high level, a pin 3 of the voice recognition chip U1 is connected to one end of the capacitor C24, and a pin 4 of the voice recognition chip U1 is connected to one end of the capacitor C25. Pin 5 of the voice recognition chip U1 and the other end of capacitor C24 and the other end of capacitor C25 are connected to the ground. Pin 24 of the voice recognition chip U1 and one end of capacitor C22, one end of capacitor C23 and the other end of capacitor C21 are connected to the same potential. Pin 23 of the voice recognition chip U1 is connected to the other end of capacitor C22. Pin 22 of the voice recognition chip U1 is connected to the other end of capacitor C23. Pins 22, 21 and 20 of the voice recognition chip U1 are connected to A1, A2 and A3 of the voice collection module 121 respectively.

[0144] The working process of this circuit is as follows: microphone MIC collects the user's voice input, capacitor C27 and capacitor C28 convert the user's voice input into an electrical signal and output it to the voice recognition chip U1, and the voice recognition chip U1 converts the captured voice signal into a switch signal and a wind speed adjustment control signal.

[0145] The technical effect of this embodiment is that through voice input and output, the user interactivity and friendliness of the device are improved, allowing users to easily control the start, stop and speed adjustment of the fan through voice commands without directly contacting the device. Voice control enables the fan to have more functions, such as intelligent operation and customized voice settings based on user voice commands, enhancing the intelligence of the device and user experience.

[0146] For the voice output module 123, as an implementation method, Fig.12 As shown, the voice output module 123 includes a power amplifier module 1131 and a speaker 1132, and the power amplifier module 1131 is connected to the voice recognition module 122 and the speaker 1132 respectively.

[0147] Among them, the power amplifier module 1131 is mainly responsible for amplifying the voice signal, and amplifies the low-level voice signal output from the voice recognition module 122 to a high-level signal sufficient to drive the speaker 1132. The speaker 1132 receives the voice signal amplified by the power amplifier module 1131 and converts it into sound output.

[0148] As an example, Fig.13 As shown, the voice output module 123 includes a power amplifier chip U2 and a speaker S1. The B1 and B2 terminals of the power amplifier chip U2 are respectively connected to the pins 16 and 17 of the voice recognition chip U1. The power amplifier chip U2 is responsible for amplifying the voice signal and then outputting the voice from the speaker S1.

[0149] The technical effect of this embodiment is that: through the power amplifier module, it can be ensured that the voice signal will not be lost or deformed during the transmission process, and the speaker can be driven with sufficient volume so that the user can clearly hear the voice output result.

[0150] As an implementation method, Fig.14 As shown, the portable fan also includes a networking module 106, which is respectively connected to the voice module 112 and the control module 102; the voice module 112 uploads the voice signal to the cloud server 107 through the networking module 106, and the cloud server 107 converts the voice signal into a switch signal and a wind speed adjustment control signal and outputs it to the networking module 106, and the networking module 106 sends the switch signal and the wind speed adjustment control signal to the control module 102.

[0151] Among them, the voice recognition service and remote control function of the cloud server 107 can be used through networking to further improve the recognition accuracy and flexibility of the system. The specific steps are: using a microphone to capture the user's voice signal, the voice signal is transmitted to the networking module 106 through analog-to-digital conversion, the networking module 106 uploads the captured voice signal to the cloud server 107 for voice recognition service, and the cloud server 107 converts the voice signal into a switch signal and a wind speed adjustment control signal, and returns it to the networking module 106. The networking module 106 sends the switch signal and wind speed adjustment control signal returned by the cloud to the control module 102, and the control module 102 generates a corresponding control signal. The control module 102 is based on voice instructions, such as "turn on the fan" or "turn off the fan", or other switch instructions can be customized to increase the convenience and fun of use. For example, possible customized switch instructions: "turn on the wind", "turn off the wind", "start blowing", "I'm hot, turn on the fan", etc., these instructions can be further expanded according to the user's usage habits and preferences to improve the interactive experience. The switch control signal is generated according to the voice command. The control module 102 calculates the corresponding PWM signal duty cycle according to the voice command, such as "increase the wind speed" or "reduce the wind speed", and generates a PWM control signal. The driving module 103 drives the motor according to the received switch control signal and PWM control signal to control the opening / closing and wind speed adjustment of the fan.

[0152] The technical effects of this implementation are as follows: since voice recognition is performed on a cloud server, the cloud server has stronger computing power and more efficient voice recognition algorithms, and can more accurately recognize the user's voice commands, thereby improving recognition accuracy; the voice recognition task is completed in the cloud, reducing the computing burden of the portable fan device, allowing the device to adopt a lower-cost hardware configuration while extending battery life; the addition of a networking module enables the portable fan to be linked with other smart devices to achieve remote control and data analysis, further enhancing the user experience and the intelligence of the device.

[0153] As an implementation method, Fig.15 As shown, the portable fan also includes a speed measurement module 105, which is respectively connected to the three-phase micromotor 104 and the control module 102; the speed measurement module 105 is used to measure the actual speed of the three-phase micromotor 104 and send it to the control module 102, the control module 102 obtains the speed change according to the actual speed and the target speed, and adjusts the PWM signal duty cycle according to the speed change, and outputs the adjusted PWM control signal to the drive module 103.

[0154] Among them, in this embodiment, an incremental PID control algorithm is specifically used to generate a PWM signal to improve the stability of the PWM signal and the accuracy of the motor speed regulation, which can be achieved by the following steps: The incremental PID control algorithm adjusts the control amount by calculating the current and previous errors, thereby achieving precise control of the system, including three parts: proportional (P), integral (I) and differential (D): proportional control (P): proportional adjustment of the current error; integral control (I): cumulative adjustment of past errors; differential control (D): adjustment of the rate of change of the current error. Initialize the PWM module and timer, set the parameters required by the PID control algorithm (proportional coefficient Kp, integral coefficient Ki, differential coefficient Kd), obtain sensor data, and the speed measurement module 105 can be a magnetic encoder or a Hall sensor, which measures the speed of the motor in real time and feeds it back to the control module 102. The control module 102 calculates the current error according to the set target speed and the actual measured speed, calculates the incremental control amount according to the current error, adjusts the PWM duty cycle, outputs the PWM signal, and controls the speed of the three-phase micromotor 104.

[0155] The technical effect of this implementation is that the PID control algorithm adjusts the control amount according to the error, can accurately track the set value, and quickly stabilize the motor speed near the target value. The PID control algorithm responds quickly to error changes and can adjust the PWM signal in time when the load changes, ensuring the flexibility and accuracy of wind speed regulation. The PID control algorithm can also accurately adjust the PWM control signal to ensure a smooth transition of the wind speed.

[0156] As an implementation manner, when the control module 102 detects that the operating voltage changes, the operating voltage is kept within a constant voltage range by boosting or reducing the voltage.

[0157] When the control module 102 detects that the operating voltage has changed, in order to maintain the stability of the motor operation, the control module can adjust the operating voltage to a preset constant voltage range through a boost or buck circuit. The control module 102 continuously monitors the input voltage, and triggers the voltage regulation mechanism when it detects that the voltage deviates from the preset range (such as 6-8.4V). The control module 102 controls a boost or buck converter. For example, when the input voltage is lower than the set range, the control module 102 enables the boost circuit to increase the voltage to within the set range. Conversely, when the input voltage is higher than the set range, the control module 102 enables the buck circuit to reduce the voltage to within the set range. Through the feedback loop, the control module 102 can adjust the degree of boost or buck in real time to ensure that the output voltage is constant within the preset range.

[0158] As an implementation manner, when the control module 102 detects that the operating current changes, the control module 102 keeps the operating current within a constant current range by adjusting the PWM control signal.

[0159] When the control module 102 detects that the working current has changed, the current is kept within a constant range by adjusting the PWM (pulse width modulation) control signal. The control module 102 continuously monitors the working current of the motor. When it is detected that the current deviates from the preset range (such as 0.12-1A), the current regulation mechanism is triggered. The control module 102 changes the input power of the motor by adjusting the duty cycle of the PWM signal. For example, when it is detected that the current is lower than the preset range, the PWM duty cycle is increased, the input power is increased, and the current is increased. Conversely, when the current is higher than the preset range, the PWM duty cycle is reduced, the input power is reduced, and the current is reduced. Through the feedback of the current sensor, the control module 102 adjusts the duty cycle of the PWM signal in real time to ensure that the working current remains within a constant range.

[0160] As an implementation manner, when the control module 102 detects that the operating power changes, it keeps the operating power stable by adjusting the operating voltage or the operating current.

[0161] The control module 102 continuously monitors the working power of the motor (P=V×I), and triggers the power regulation mechanism when it detects that the power deviates from the set value. By controlling the boost or buck converter, the input voltage is adjusted to restore the power to the set value. For example, when the power is lower than the set value, the input voltage is increased to increase the power; when the power is higher than the set value, the input voltage is reduced to reduce the power. By adjusting the PWM signal, the current is changed to restore the power to the set value. For example, when the power is lower than the set value, the PWM duty cycle is increased, the current is increased, and the power is increased; when the power is higher than the set value, the PWM duty cycle is reduced, the current is reduced, and the power is reduced. Through the control signal feedback, the control module 102 adjusts the voltage or current in real time to ensure that the working power remains within a constant range.

[0162] In the above implementation, the control module monitors the working voltage, current and power of the motor in real time and ensures that the motor can operate stably under various working conditions through a corresponding adjustment mechanism, thereby improving the efficiency and performance of the motor and ensuring the reliability and stability of the portable fan in different environments.

[0163] For the driving module 103, as an implementation method, Fig.16 and Fig.17 As shown, the first bridge arm includes a first upper bridge arm switch tube 301 and a second lower bridge arm switch tube 302, the second bridge arm includes a third upper bridge arm switch tube 303 and a fourth lower bridge arm switch tube 304, the third bridge arm includes a fifth upper bridge arm switch tube 305 and a sixth lower bridge arm switch tube 306, the midpoint of the first bridge arm is connected to the first coil 311, the midpoint of the second bridge arm is connected to the second coil 312, and the midpoint of the third bridge arm is connected to the third coil 313; the first upper bridge arm switch tube 301, the first coil 311, the second coil 312 and the fourth lower bridge arm switch tube 304 form a first loop; the first upper bridge arm switch tube 301, the first coil 311, the third The coil 313 and the sixth lower bridge arm switch tube 306 form a second loop; the third upper bridge arm switch tube 303, the second coil 312, the third coil 313 and the sixth lower bridge arm switch tube 306 form a third loop; the third upper bridge arm switch tube 303, the second coil 312, the first coil 311 and the second lower bridge arm switch tube 302 form a fourth loop; the fifth upper bridge arm switch tube 305, the third coil 313, the first coil 311 and the second lower bridge arm switch tube 302 form a fifth loop; the fifth upper bridge arm switch tube 305, the third coil 313, the second coil 312 and the fourth lower bridge arm switch tube 304 form a sixth loop.

[0164] Among them, the first bridge arm includes a first upper bridge arm switch tube 301 and a second lower bridge arm switch tube 302, and the midpoint is connected to the first coil 311. The second bridge arm includes a third upper bridge arm switch tube 303 and a fourth lower bridge arm switch tube 304, and the midpoint is connected to the second coil 312. The third bridge arm includes a fifth upper bridge arm switch tube 305 and a sixth lower bridge arm switch tube 306, and the midpoint is connected to the third coil 313, forming a total of six loops, each loop is composed of a switch tube and a coil, and the control module 102 controls each loop to be turned on one by one through a switch control signal to drive the motor to start running. The control module 102 generates a switch control signal according to the received switch signal, and the switch control signal is used to control the switch tubes in each loop one by one. Specifically, the switch tubes in each bridge arm are turned on one by one according to the control of the switch control signal, so as to drive the phase coil of each motor through current. As the switch tubes in each bridge arm are gradually turned on, current flows through the respective phase coils, and the motor starts to rotate. The gradual turning on of the six loops means starting each motor phase in the fan in sequence, thereby starting the entire fan system. Specifically, the switch tube of each of the six circuits is turned on in sequence to make each circuit conductive. The first circuit to the sixth circuit are conductive in sequence, and the fan rotates forward. The sixth circuit to the first circuit are conductive in sequence, and the fan rotates reversely.

[0165] After receiving the wind speed adjustment control signal, the control module 102 generates a PWM control signal. For each loop, the PWM control signal is used to adjust its corresponding switch tube, thereby adjusting the speed of the motor.

[0166] As an implementation mode, the control module also controls the on-time of the switch tube in each loop through a PWM control signal to adjust the speed of the motor.

[0167] Among them, the control module receives the wind speed adjustment control signal from the touch module or the voice module, and these signals contain the user's adjustment instructions for the fan speed. The control module 102 generates a corresponding pulse width modulation (PWM) control signal according to the wind speed adjustment control signal, and the duty cycle of the PWM signal (i.e., the proportion of the high level duration to the entire cycle) directly corresponds to the required fan speed. The control module 102 applies the generated PWM control signal to the two switch tubes in each loop, and the specific operation is as follows: the switch tube in each loop performs a switching operation according to the duty cycle of the PWM signal. At a high level, the switch tube is turned on; at a low level, the switch tube is turned off. By adjusting the duty cycle of the PWM signal, the on-time of the switch tube in each loop is controlled, thereby adjusting the current flowing through the motor coil. The speed of the motor is proportional to the current intensity in the motor coil. By adjusting the on-time of the switch tube in each loop, the control module 102 can accurately control the current of the three-phase micromotor 104, thereby adjusting the speed of the three-phase micromotor 104. By gradually increasing or decreasing the duty cycle of the PWM signal, the speed of the fan can be accelerated or decelerated, thereby achieving the adjustment of the fan speed.

[0168] The technical effect of this embodiment is that the control module generates a corresponding PWM control signal based on the received wind speed adjustment control signal. The duty cycle of the PWM signal directly determines the conduction time of the switch tube in each circuit, thereby controlling the current of the motor coil. Therefore, the motor speed can be accurately adjusted by adjusting the duty cycle of the PWM signal.

[0169] As an implementation method, the portable fan further includes an energy feedback circuit, which is connected to the control module, the motor and the energy storage unit. When the control module detects that the PWM duty cycle is reduced, the energy feedback circuit is controlled to start working, and the back electromotive force generated when the motor decelerates is converted into electrical energy through the rectifier circuit and stored in the energy storage unit. The energy recovery circuit includes a rectifier circuit, an energy storage unit and a control switch. After receiving the energy feedback signal, the control switch is turned on, and the kinetic energy of the motor is converted into electrical energy through the rectifier circuit and stored in a supercapacitor or a battery.

[0170] As an example, a portable fan is running at high speed. At this time, the user reduces the wind speed or stops the fan through the input module. The control module detects the wind speed adjustment signal or switch signal, reduces the PWM signal duty cycle, and slows down the motor. The control module generates an energy feedback signal to control the energy recovery circuit to start. The back electromotive force generated when the motor decelerates is converted into electrical energy through the rectifier circuit, and the converted electrical energy is stored in a supercapacitor or battery. When the fan starts again, the control module detects the start signal and controls the energy storage unit to release electrical energy to power the motor, reducing the consumption of external power.

[0171] The technical effect of this embodiment is: through energy recovery, kinetic energy can be converted into electrical energy storage when the fan slows down or stops, reducing energy waste; reducing dependence on external power sources, extending battery life, and improving the endurance of portable fans; users can enjoy more stable and lasting wind speed adjustment during use, improving the overall user experience.

[0172] As an implementation mode, the input module 101 includes a voice module 112 and a touch module 111, both of which are connected to the control module 102, and the voice module 112 and the touch module 111 respectively output a switch signal and a wind speed adjustment control signal according to user instructions, and the control module 102 generates a switch control signal and a PWM control signal according to the switch signal and the wind speed adjustment control signal.

[0173] The technical effect of this implementation is that the combination of the voice module and the touch module allows users to choose the most suitable operation mode according to their own preferences, thereby increasing the intelligence of the product.

[0174] As an implementation mode, the input module 101 includes a voice module 112 and a touch module 111, both of which are connected to the control module 102, the voice module 112 turns on and off the touch module according to user instructions, and outputs a switch signal, the touch module 111 outputs a wind speed adjustment control signal, and the control module 102 generates a switch control signal and a PWM control signal according to the switch signal and the wind speed adjustment control signal, respectively.

[0175] Among them, the user sends a command to turn on or off the touch module to the voice module 112 through a voice command, and the voice module 112 passes these commands to the control module 102. The user sends a command to turn on or off the fan to the voice module 112 through a voice command, and the voice module 112 generates a switch signal according to the user's command and passes it to the control module 102. When the touch module 111 is enabled, the user inputs a command for wind speed adjustment to the touch module 111 through a touch operation (such as sliding or clicking), and the touch module 111 generates a wind speed adjustment control signal according to the user's operation and passes it to the control module 102. The control module 102 enables or disables the touch module 111 according to the instruction of the voice module 112. When the touch module 111 is disabled, all touch operations will not generate a wind speed adjustment control signal, thereby avoiding misoperation. After receiving the switch signal, the control module 102 generates a switch control signal for controlling the opening or closing of the fan. After receiving the wind speed adjustment control signal, the control module 102 calculates the corresponding PWM signal duty cycle and generates a PWM control signal for controlling the speed of the motor.

[0176] The technical effect of this implementation is: the touch module is enabled or disabled through voice commands. The user can disable the touch module through voice when holding the fan, thereby avoiding incorrect operation of wind speed adjustment due to accidental touch, thereby improving the user's operating experience and product safety; the switch signal generated by the voice module is processed by the control module to ensure that the fan's switch operation is accurate; when the touch module is enabled, it generates a wind speed adjustment control signal through the user's touch operation, and the control module generates a high-precision PWM control signal based on the signal to achieve precise adjustment of the fan speed to meet the user's personalized needs.

[0177] As an example, Fig.18 , which is a circuit diagram of the driving module 103 , the driving module 103 includes a first driving submodule, a second driving submodule and a third driving submodule.

[0178] The first driving submodule includes a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q7, a capacitor C16, a capacitor C21, a capacitor C27, a resistor R20, a resistor R24, a resistor R25 and a resistor R26. The first end of the capacitor C16, the first end of the resistor R24, the source of the MOS transistor Q2, the first end of the capacitor C21 and the first end of the capacitor C27 are connected to a power supply. The second end of the capacitor C16 is connected to the second end of the resistor R24, the drain of the MOS transistor Q1 and the gate of the MOS transistor Q2. The gate of the MOS tube Q1 is connected to the first end of the resistor R20 and the first control signal terminal U_H respectively, the source of the MOS tube Q1 and the second end of the resistor R20 are connected to the ground, the drain of the MOS tube Q2 is connected to the drain of the MOS tube Q7 and the first end of the first coil respectively, the gate of the MOS tube Q7 is connected to the first end of the resistor R25 and the second control signal terminal U_L respectively, the source of the MOS tube Q7 is connected to the second end of the resistor R25 and the first end of the resistor R26 respectively, and the second end of the capacitor C21 and the second end of the capacitor C27 are connected to the ground.

[0179] The second driving submodule includes a MOS transistor Q3, a MOS transistor Q4, a MOS transistor Q8, a capacitor C26, a capacitor C25, a resistor R32, a resistor R34, a resistor R35 and a resistor R38. A first end of the capacitor C26, a first end of the resistor R34, a source of the MOS transistor Q4 and a first end of the capacitor C25 are connected to a power supply in common. A second end of the capacitor C26 is respectively connected to a second end of the resistor R34, a drain of the MOS transistor Q3 and a gate of the MOS transistor Q4. The gate of the MOS transistor Q3 is connected to a first end of the resistor R32 and a third control signal terminal V_H. A source of the MOS transistor Q3 is commonly connected to a second end of the resistor R32. A drain of the MOS transistor Q4 is respectively connected to a drain of the MOS transistor Q8 and a first end of the second coil. A gate of the MOS transistor Q8 is respectively connected to a first end of the resistor R35 and a fourth control signal terminal V_L. A source of the MOS transistor Q8 is respectively connected to a second end of the resistor R35 and a first end of the resistor R38. A second end of the capacitor C25 is connected to ground.

[0180] The third driving submodule includes a MOS transistor Q5, a MOS transistor Q6, a MOS transistor Q9, a capacitor C32, a capacitor C35, a resistor R42, a resistor R46, a resistor R49 and a resistor R51. The first end of the capacitor C32, the first end of the resistor R46, the source of the MOS transistor Q6 and the first end of the capacitor C35 are connected to a power supply. The second end of the capacitor C32 is respectively connected to the second end of the resistor R46, the drain of the MOS transistor Q5 and the gate of the MOS transistor Q6. The gate of the MOS transistor Q5 is connected to the first end of the resistor R42 and the drain of the MOS transistor Q5. The fifth control signal terminal W_H, the source of the MOS transistor Q5 and the second end of the resistor R42 are connected to the ground, the drain of the MOS transistor Q6 is respectively connected to the drain of the MOS transistor Q9 and the first end of the third coil, the gate of the MOS transistor Q9 is respectively connected to the first end of the resistor R49 and the sixth control signal terminal W_L, the source of the MOS transistor Q9 is respectively connected to the second end of the resistor R49 and the first end of the resistor R51, the second end of the capacitor C25 is connected to the ground, and the second end of the resistor R26, the second end of the resistor R38 and the second end of the resistor R51 are commonly connected to the ground.

[0181] Among them, the power supply, MOS tube Q2, the first coil, the second coil, MOS tube Q8 and the resistor R38 form a first loop; the power supply, MOS tube Q2, the first coil, the third coil, MOS tube Q9 and the resistor R51 form a second loop; the power supply, MOS tube Q4, the second coil, the third coil, MOS tube Q9 and the resistor R51 form a third loop; the power supply, MOS tube Q4, the second coil, the first coil, MOS tube Q7 and the resistor R26 form a fourth loop; the power supply, MOS tube Q6, the third coil, the first coil, MOS tube Q7 and the resistor R26 form a fifth loop; the fifth upper bridge arm switch tube, the third coil, the second coil, MOS tube Q8 and the resistor R38 form a sixth loop.

[0182] Among them, MOS tube Q2, MOS tube Q4, and MOS tube Q6 can adopt NMOS tubes or PMOS tubes. The half-bridge driving mode of MOS tube Q2, MOS tube Q4, and MOS tube Q6 can adopt the driving mode in the circuit diagram as well as other driving modes, such as capacitor energy storage driving, transformer coupling driving, optical coupling driving, etc.

[0183] The control module 102 inputs a switch control signal to the two switch tubes in each loop through the first control signal terminal to the sixth control signal terminal, and the control module 102 controls the first loop to the sixth loop to be turned on one by one in a preset sequence through the switch control signal to drive the motor to start running. The control module 102 inputs a PWM control signal to the two switch tubes in each loop through the first control signal terminal to the sixth control signal terminal, and controls the conduction current of each loop through the duty cycle of the PWM control signal to adjust the speed of the motor.

[0184] As an implementation method, Fig.19 As shown, in this embodiment, the two switch tubes of each bridge arm are integrated together, MOS tube Q2 and MOS tube Q7 are integrated into chip S1, MOS tube Q4 and MOS tube Q8 are integrated into chip S2, MOS tube Q6 and MOS tube Q9 are integrated into chip S3. The integrated switch tubes can significantly reduce the occupied space on the circuit board, making the drive circuit more compact. The use of integrated switch tube modules simplifies circuit design and layout, and reduces wiring complexity.

[0185] As an implementation method, Fig. 20 As shown, the input module includes a manual switch module 201, a touch module 111, a voice module 112, a networking module 106 and a wireless module 202, which are respectively connected to the control module 102, and the portable fan also includes a mist module 203, a cooling module 204, a heating module 205, a lighting module 206 and a shaking head module 207, which are respectively connected to the control module 102.

[0186] The manual switch module 201 may be a key switch or an encoder, the touch module 111 may be a touch key, a sliding resistor, a touch sliding module or a touch screen module, and the wireless module 202 may be a mobile control module, a Bluetooth control module or a wireless control module;

[0187] Among them, the button switch can realize manual control of the fan, and the fan can be turned on and off or speed adjusted by pressing the button. The encoder is used to adjust the wind speed, and the fan speed setting is changed by rotating the encoder. The touch button controls the switch and wind speed adjustment of the fan through touch sensing. The sliding resistor can adjust the wind speed by sliding the resistance value, providing continuous wind speed adjustment. The touch sliding module adjusts the wind speed by sliding gestures, and detects sliding parameters such as speed, direction and position to control the wind speed. The touch screen module provides a graphical interface, and controls multiple functions through the touch screen, such as switch, wind speed adjustment, timing setting, etc. The voice control module can realize the control of the fan's opening, closing and wind speed adjustment through voice commands, and enhance the intelligent control experience. The networked voice control module can realize remote voice control by connecting to the Internet and uploading voice commands to the cloud server for processing. The networked module can realize remote control functions through the Internet, and can remotely control various functions of the fan through mobile phones or other devices. The mobile control module can realize various functions of the fan through mobile devices (such as mobile phones or tablets), including switch, wind speed adjustment, timing, etc. The Bluetooth control module can realize the connection of mobile devices via Bluetooth to realize short-range wireless control of the fan. The wireless control module can realize remote control and management of the fan through wireless signals (such as Wi-Fi). The atomization module 203 can provide a humidification function, and the wind blown out by the fan is cooler and moister by atomizing moisture. The refrigeration module 204 can provide a refrigeration function, and reduce the air outlet temperature through the internal refrigeration element to improve the cooling effect. The heating module 205 can provide a heating function, and make the wind blown out by the fan warm through the internal heating element, which is suitable for cold seasons. The lighting module 206 can provide a lighting function, integrate LED lights or other light sources, and provide night lighting or decorative lighting effects. The shaking head module 207 can provide an automatic shaking head function, so that the fan can swing left and right, increase the coverage of the wind, and improve comfort.

[0188] The technical effect of this embodiment is that the portable fan not only provides a variety of control methods and intelligent functions, but also significantly improves the user's comfort experience and operational convenience, and meets various needs in different usage scenarios.

[0189] It should be noted that all input, output and control functions in a portable fan can be integrated into a single chip or integrated circuit. This integration can simplify the design and manufacturing process of the system, reduce the number of components and space occupancy, and may also reduce costs and power consumption.

[0190] The portable fan based on a three-phase micromotor provided in the first embodiment includes at least a handheld fan for handheld use, a desktop fan for portable use and can be placed on a desktop, or a neck-hanging fan for neck use. The structure of the portable fan includes but is not limited to the following embodiments:

[0191] As an embodiment, this embodiment provides a portable fan based on a three-phase micro motor, which can be used as a handheld fan, such as Fig.21 As shown, it is an exploded view of a portable fan, and the portable fan includes:

[0192] Handle left shell 81, handle right shell 82, air outlet front shell 83, middle shell 84, air outlet 85, button 86, wave switch button 87, hanging wire groove 88, shock-absorbing silicone 89, shock-absorbing silicone 90, air inlet net 91, shading foam 92, battery foam 93, silicone gasket 94, motor assembly 95, screws 96, screws 97, battery 98 and PCB99.

[0193] As an embodiment, this embodiment provides a portable fan based on a three-phase micro motor, which can be used as another handheld fan, such as Fig. 22 As shown, it is an exploded view of a portable fan, and the portable fan includes:

[0194] Front shell decoration 401, flat connecting plate assembly 402, ball bearing 403, front shell 404, air duct 405, middle shell 406, fan motor 407, spring 408, fan blade 409, screw 410, rear shell 411, rear shell decoration 412, screw cover 413, screw 414, roller assembly 415, button decoration 416, safety supervision office fixing bracket 417, roller switch small plate 418, screw 419, wave switch small plate 420, mainboard fixing bracket 421, wave switch 422, handle bracket 423, battery pack 424, handle 425, handle decoration 426, lanyard bracket 427, screw 428 and snap ring 429.

[0195] As an implementation mode, this implementation mode provides a portable fan based on a three-phase micro motor, which can be used as a portable desktop fan that can be placed on a desktop. Figure 23 to Figure 25 As shown, it is an exploded view of a portable fan, and the portable fan includes:

[0196] Screen shell 1, screen front shell 2, character light-transmitting patch 3, screen light-transmitting bracket 4, digital screen PCB 5, self-tapping screws 6, screen back shell 7, screws 8, shock-absorbing silicone ring 9, shock-absorbing EVA 10, fan motor bracket 11, motor 12, snap ring 13, gasket 14, fan bearing 15, motherboard, digital screen PCB connecting line 16, fan spring 17, magnetic ring assembly 18, fan blade 19, fan blade shell 20, light guide ring 21, light strip 22, fan head bracket 23, lower screw hole cover 24, upper screw hole cover 25, air duct part 26, shell 27, filter element both ends pressing foam 28, air filter element 29, filter element bracket 30, back cover 31, copper nut 32, countersunk machine screw 33, shell wire snap ring 34, wire pressing cover 35, base Wire clamp 36, shaft 37, air duct wire cover 38, left shaft plug 39, right shaft plug 40, wire shielding cover 41, aluminum alloy bracket 42, machine screw 43, base upper shell 44, self-tapping screw 45, stepper motor 46, stepper motor bracket 47, steel ball 48, steel ball bracket 49, steel ball lower bracket 50, large gear 51, small gear 52, clutch gear 53, stepper motor bearing 54, battery EVA 55, spring 56, buckle 57, round button 58, round button silicone 59, light button silicone 60, light button 61, knob 62, button plate 63, self-tapping screw 64, charging board 65, charging board bracket 66, base lower shell 67, battery pack 68, battery EVA 69, base bottom shell 70, label 71 and foot pad 72.

[0197] As an implementation mode, this implementation mode provides a portable fan based on a three-phase micro motor, which can be used as a neck hanging fan, such as Fig.26 As shown, it is an exploded view of a portable fan, and the portable fan includes:

[0198] Neck support 501 , air inlet 502 , air outlet 503 and clamping arm 504 .

[0199] Embodiment 2

[0200] This embodiment provides a control method for a portable fan based on the embodiment. Fig. 27 As shown, the control method includes:

[0201] Step S101. Control the working voltage of the three-phase micromotor to 2 to 18 volts, control the working current of the three-phase micromotor to 0.1 to 10 amps, and / or control the rated working power of the three-phase micromotor to 0.5 to 100 watts.

[0202] Step S102: Control the rated operating speed of the three-phase micromotor through the driving module according to the operating voltage, operating current and / or rated operating power to reduce the high-speed noise of the three-phase micromotor and control the wind speed to be within a preset wind speed range.

[0203] The control method also includes:

[0204] Step S111. Obtaining a wind speed adjustment control signal;

[0205] Step S112. Convert the wind speed regulation control signal into a PWM control signal;

[0206] Step S113: Control the switch tube of each bridge arm through the PWM control signal to adjust the speed of the motor.

[0207] The control method also includes:

[0208] Step S201: Obtain a switch signal.

[0209] Step S202: Convert the switch signal into a switch control signal.

[0210] Step S203: Control the switch tube of each bridge arm through the switch control signal to drive the motor to start or stop running.

[0211] Among them, the switch signal and wind speed adjustment control signal are control signals generated according to user instructions. The touch signal and adjustment signal generated by the user through touch or other means can be directly converted into switch control and PWM control signals. The switch signal can be the user's switch operation, such as a command to turn on or off the fan; the wind speed adjustment control signal is used to adjust the speed of the fan, and is usually generated by the user's manual operation or other control methods.

[0212] Among them, the switch signal is processed and converted into a switch control signal that can control the bridge arm switch tube, which is used to start or stop the operation of the motor. The wind speed adjustment control signal is processed to calculate the duty cycle of the corresponding PWM (pulse width modulation) control signal. The PWM control signal is used to adjust the speed of the motor by adjusting the conduction time of the switch tube of each bridge arm to control the speed of the motor.

[0213] Among them, according to the switch control signal, the driver module will open or close the switch tube of each bridge arm accordingly, thereby starting or stopping the operation of the motor. At the same time, according to the calculated PWM control signal, the driver module adjusts the working cycle and duty cycle of each bridge arm switch tube to control the speed and power output of the motor.

[0214] As an implementation mode, when the input module is a touch control module, converting the wind speed adjustment control signal into a PWM control signal includes:

[0215] The duty cycle of the PWM signal is calculated according to the wind speed adjustment control signal, and a PWM control signal is generated according to the duty cycle of the PWM signal.

[0216] As an implementation manner, when the input module is a voice module, the voice module captures the user's voice signal and converts the voice signal into a switch signal and a wind speed adjustment control signal.

[0217] For the above two implementations, please refer to Example 1 for details, which will not be described in detail here.

[0218] See also Fig.28 An embodiment of the present application provides a portable fan based on a three-phase micromotor, comprising a housing 1 (see Figure 23 to Figure 25 As shown) and the power supply circuit 01, the controller 02, the drive bridge circuit 03, the three-phase micro motor 04 and the fan blades 19 installed in the housing 1 (see Figure 23 to Figure 25 The three-phase micro motor 04 is connected to the fan blades 19 .

[0219] The power supply circuit 01 includes a rechargeable battery. The power supply circuit 01 is connected to the power supply end of the controller 02 and the power supply bus V+ / V- of the driving bridge circuit 03. The control pin of the controller 02 is used to connect to the controlled end of the driving bridge circuit 03. The three output ends of the driving bridge circuit 03 are connected to the three electrodes U / V / W of the three-phase micromotor 04. The controller 02 is used to output a control signal to control the driving bridge circuit 03 to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor 04 to start, stop or change speed.

[0220] The rechargeable battery is 1, 2 to 6 cells, providing a power supply voltage output of 2 to 18 volts. Typically, the rechargeable battery is 1, 2 or 3 cells connected in series, in parallel, or in series and parallel, wherein the output voltage of one rechargeable battery is between 3 volts and 4.2 volts. The control signal is generally a PWM signal. The controller 02 is, for example, a single chip microcomputer.

[0221] In this embodiment, the portable fan is powered by a low-voltage rechargeable battery, omitting the conventional driver chip of the driver bridge circuit 03, saving costs, and directly using the controller 02 to control / drive the driver bridge circuit 03 to generate three-phase AC power to drive the three-phase micro motor 04 to achieve the aforementioned high-speed, wide-range speed regulation. On the other hand, the three-phase micro motor 04 is driven by a sinusoidal three-phase current, which is smoother than the square wave three-phase current drive, greatly reducing the noise and power consumption of the three-phase micro motor 04, improving the endurance, and providing a high-efficiency, low-noise, adjustable wind speed, and long-endurance portable fan solution, which improves the user experience.

[0222] For example, compared with portable fans of the same size on the market, under similar power supply, the portable fan provided by the embodiment of the present application can increase the battery life by about 30% and reduce the noise by about 30%.

[0223] In some embodiments, the drive bridge circuit 03 includes three drive bridge arms, each drive bridge arm includes an upper bridge arm and a lower bridge arm connected in series between the positive pole V+ of the power supply bus and the negative pole V- of the power supply bus, and the three series nodes of the three drive bridge arms constitute the three output ends of the drive bridge circuit 03, which are respectively connected to the three electrodes U / V / W of the three-phase micromotor 04, and the controlled ends of the three upper bridge arms and the controlled ends of the three lower bridge arms are respectively used to connect to the six control pins of the controller 02.

[0224] See also Fig.29 The three upper bridge arms include the first upper bridge arm 031, the second upper bridge arm 033 and the third upper bridge arm 035, and the three lower bridge arms include the first lower bridge arm 032, the second lower bridge arm 034 and the third lower bridge arm 036. The series node A between the first upper bridge arm 031 and the first lower bridge arm 032, the series node B between the second upper bridge arm 033 and the second lower bridge arm 034, and the series node C between the third upper bridge arm 035 and the third lower bridge arm 036 are sequentially connected to the three electrodes U / V / W of the three-phase micro motor 04.

[0225] In some embodiments, each upper bridge arm includes a first switch tube, and each lower bridge arm includes a second switch tube. The first switch tube and the second switch tube are connected in series between the positive pole V+ of the power supply bus and the negative pole V- of the power supply bus. A series node between the first switch tube and the second switch tube constitutes an output end of the drive bridge circuit 03. A control end of the first switch tube is used to connect to a control pin of the controller 02, and a control end of the second switch tube is used to connect to a control pin of the controller 02.

[0226] See also Fig.30 , the first lower bridge arm 032 includes a switch tube Q11, the first lower bridge arm 033 includes a switch tube Q12, the second upper bridge arm 033 includes a switch tube Q13, the second lower bridge arm 034 includes a switch tube Q14, the third upper bridge arm 035 includes a switch tube Q15, and the third lower bridge arm 036 includes a switch tube Q16. The switch tubes Q11, Q12, Q13, Q14, Q15, and Q16 are connected to the control pins U_H, U_L, V_H, V_L, V_H, and V_L of the controller 02, respectively.

[0227] Exemplarily, the driving bridge circuit 03 of this embodiment is adapted to a lower working voltage. For example, the power supply circuit 01 uses one, two or more rechargeable batteries connected in parallel, and the output voltage is 3V to 4.2V.

[0228] In some embodiments, each upper bridge arm further includes a third switch tube, the control end of the first switch tube is connected to the first end of the third switch tube, the second end of the third switch tube is grounded, and the control end of the third switch tube constitutes the controlled end of the upper bridge arm.

[0229] See also Fig.31 The first lower bridge arm 032 further includes a switch tube Q17, the second upper bridge arm 033 further includes a switch tube Q18, and the third upper bridge arm 035 further includes a switch tube Q19. The switch tubes Q17, Q18, and Q19 are connected to the control pins U_H, V_H, and V_H of the controller 02, respectively.

[0230] The switch tube is, for example, an NMOS tube or a PMOS tube, or may be an IGBT tube.

[0231] For example, the driving bridge circuit 03 of this embodiment is adapted to the working voltage connected to the Fig.30 The power supply circuit 01 uses two or more sets of rechargeable batteries connected in series to output, and the output voltage is above 6 volts, wherein each set of rechargeable batteries includes one or more parallel rechargeable batteries. Exemplarily, two sets of rechargeable batteries are used in series to output, and the output voltage is 6 volts to 8.4 volts.

[0232] In some embodiments, the portable fan also includes a three-phase micromotor fan module, which includes a drive bridge circuit 03, a three-phase micromotor 04 and fan blades 19. The drive bridge circuit 03, the three-phase micromotor 04 and the fan blades 19 can be constituted as part or all of the three-phase micromotor fan module, thereby modularizing the three-phase micromotor fan module so that it can be used as an independent integral component / product.

[0233] See also Fig.32 In some embodiments, the portable fan further includes: an input module 05 and a detection circuit 06 .

[0234] The input module 05 is connected to the controller 02, and the input module 05 is used to generate an input signal to the controller 02 under user operation; the detection circuit 06 is connected to the controller 02, the drive bridge circuit 03 and the three-phase micromotor 04, and is used to detect the working electrical parameters of the drive bridge circuit 03 and the three-phase micromotor 04; the controller 02 is also used to modulate the control signal according to the input signal and the working electrical parameters to adjust the three-phase alternating current, thereby realizing the speed adjustment, start or shutdown of the three-phase micromotor 04.

[0235] The input module 05 can generate input signals such as start-up signal, shutdown signal, speed regulation signal, etc. according to user operation. The controller 02 controls the high-speed three-phase electrode 04 to start at a preset speed according to the start-up signal, controls the high-speed three-phase electrode 04 to stop according to the shutdown signal, and adjusts the speed of the three-phase micromotor 04 according to the speed regulation signal and the working electrical parameters of the drive bridge circuit 03, such as the power supply voltage of the power supply circuit 01, the working current of the three-phase micromotor 04, and the back electromotive force voltage of the three-phase micromotor 04.

[0236] See also Fig.33In some embodiments, the detection circuit 06 includes a voltage detection circuit 061 , a current detection circuit 062 , and a back electromotive force detection circuit 063 .

[0237] The voltage detection circuit 061 is connected to the positive pole V+ of the power supply bus, and is used to detect the power supply voltage of the power supply circuit 01 (for example, the output voltage of a rechargeable battery) and output a voltage detection signal; the current detection circuit 062 is connected to the negative pole V- of the power supply bus, and is used to detect the working current of the three-phase micromotor 04 and output a current detection signal; the back electromotive force detection circuit 063 is connected to the three output ends of the drive bridge circuit 03, and is used to detect the back electromotive force of the three-phase micromotor 04 and output it.

[0238] In some embodiments, the detection circuit 06 also includes an overcurrent protection circuit 064, which is connected to the negative pole V- of the power supply bus and is used to output an overcurrent trigger signal when the operating current of the three-phase micromotor 04 reaches the overcurrent threshold; the controller 02 is also used to control the drive bridge circuit 03 to shut down the output of the three-phase electricity according to the overcurrent trigger signal.

[0239] See also Fig.30 In some embodiments, the current detection circuit 062 includes a first sampling resistor Rs, a capacitor C0 and a resistor R0. The total operating current of the three-phase micro motor 04, that is, the total driving current IR_SUIM of the driving bridge circuit 03 is detected, and the total operating current IR_SUIM is directly output to the controller 02 after being filtered by the filter circuit composed of the capacitor C0 and the resistor R0.

[0240] The current sampling method of the current detection circuit 062 of the present embodiment is suitable for outputting a square wave three-phase alternating current to drive the three-phase micromotor 04 , that is, controlling the three-phase micromotor 04 in a six-step commutation manner.

[0241] See also Fig.31 , Fig.33 and Fig.34 In some embodiments, the current detection circuit 062 includes a first sampling resistor Rs and a first differential amplifier circuit 0621 .

[0242] The first sampling resistor Rs is connected in series to the negative pole V- of the power supply bus between the power supply circuit 01 and the driving bridge circuit 03; the first differential amplifier circuit 0621, the positive input terminal and the negative output terminal of the first differential amplifier circuit 0621 are respectively connected to the two ends of the first sampling resistor, and the output terminal of the first differential amplifier circuit 0621 is connected to the controller 02.

[0243] In this embodiment, the current detection circuit 062 detects the total operating current of the three-phase micro motor 04 , that is, the total driving current IR_SUIM of the driving bridge circuit 03 is processed by the first differential amplifier circuit 0621 and then outputs the output current detection signal I_SUIM_AVG to the controller 02 .

[0244] The current sampling method of the current detection circuit 062 of this embodiment is suitable for outputting a three-phase alternating current of a sine wave or a square wave to drive a three-phase micromotor 04. Among them, outputting a three-phase alternating current of a sine wave to drive a three-phase micromotor 04 is to control the three-phase micromotor 04 in a field vector control (Field Oriented Control, FOC) manner. Specifically, it is necessary to first convert the current detection signal I_SUIM_AVG into a three-phase current of the three-phase micromotor 04 and then perform FOC control.

[0245] See also Fig.31 , Fig.33 and Fig.35 In some embodiments, the current detection circuit 062 includes two second sampling resistors R26 / R38 and two second differential amplifier circuits 0622 / 0623 .

[0246] The two second sampling resistors R26 / R38 are respectively connected in series to one end of the negative pole V- of the power supply bus to which any two driving bridge arms of the driving bridge circuit 03 are connected; the two second differential amplifier circuits 0622 / 0623 are respectively connected to the two second sampling resistors R26 / R38, and the output ends of the two second differential amplifier circuits 0622 / 0623 are connected to the controller 02; wherein the positive input end and the negative output end of each second differential amplifier circuit 0622 / 0623 are respectively connected to the two ends of the corresponding second sampling resistor R26 / R38.

[0247] It should be noted that Fig.35 It is shown that the current detection circuit 062 is connected to the driving bridge arms of the U phase and the V phase of the driving bridge circuit 03. In other examples, the current detection circuit 062 is connected to the driving bridge arms of the U phase and the W phase, or the driving bridge arms of the V phase and the W phase of the driving bridge circuit 03.

[0248] In this embodiment, the current detection circuit 062 directly detects two-phase driving current of the driving bridge circuit 03, that is, two-phase working current of the three-phase micro motor 04, and the two second differential amplifier circuits 0622 / 0623 respectively output current detection signals OP1O / OP2O to the controller 02.

[0249] The current sampling method of the current detection circuit 062 of this embodiment calculates the current detection signal of the third phase according to the current detection signal OP1O / OP2O, and performs FOC control on the three-phase micro motor 04 in combination with the three-phase current.

[0250] See also Fig.31 , Fig.33 and Fig.35In some embodiments, three second sampling resistors R26 / R38 / R51 and three second differential amplifier circuits are provided. The three second differential amplifier circuits have the same structure, and the differential amplifier circuit 0622 is taken as an example.

[0251] The three second sampling resistors R26 / R38 / R51 are respectively connected in series to one end of the negative electrode V- of the power supply bus connected to the three driving bridge arms of the driving bridge circuit 03; the three second differential amplifier circuits 0622 are respectively connected to the three second sampling resistors R26 / R38 / R51, and the output ends of the three second differential amplifier circuits 0622 are connected to the controller 02;

[0252] The positive input terminal and the negative output terminal of each second differential amplifier circuit 0622 are respectively connected to the two ends of the corresponding second sampling resistor R26 / R38 / R51.

[0253] The current sampling method of the current detection circuit 062 of this embodiment performs FOC control on the three-phase micro motor 04 according to the three current detection signals output by the three second differential amplifier circuits 0622 .

[0254] In some embodiments, the back electromotive force detection circuit 063 includes three back electromotive force detection subcircuits, each of which includes a first voltage divider R20, a second voltage divider R21 and a filter C02. The first voltage divider R20 and the second voltage divider R21 are connected in series between the corresponding electrodes U / VW of the three-phase micromotor 04 and the ground terminal (i.e., the negative electrode V- of the power supply bus), and the second voltage divider R21 is connected in parallel with the filter C02. The series node of the first voltage divider R20 and the second voltage divider R21 of each back electromotive force detection subcircuit is also connected to the back electromotive force reference pin BEMF_COM and the back electromotive force detection pin BEMF_U / BEMF_V / BEMF_W of the controller 02. It should be noted that the back electromotive force detection pins BEMF_U / BEMF_V / BEMF_W respectively represent the back electromotive force detection pin BEMF_U, the back electromotive force detection pin BEMF_V, and the back electromotive force detection pin BEMF_W connected to the three back electromotive force detection subcircuits.

[0255] Exemplarily, the first voltage divider R20 and the second voltage divider R21 both include resistors, and the filter C12 includes capacitors.

[0256] In some embodiments, the input module 05 includes at least one of a button input unit, a touch input unit, and a voice input unit. The button input unit is for example the manual switch module 201, the touch input unit is for example the touch module 111, and the voice input unit is for example the voice module 112.

[0257] In some embodiments, the power supply circuit 01 also includes a power supply circuit, the positive pole of the rechargeable battery is connected to the positive pole V+ of the power supply bus of the drive bridge circuit 03 and the positive pole of the power supply circuit, the negative pole of the rechargeable battery is connected to the negative pole V- of the power supply bus of the drive bridge circuit 03 and the negative pole of the power supply circuit, and the output of the power supply circuit is connected to the power supply end of the controller.

[0258] The power supply circuit is, for example, a circuit based on an LDO (low dropout regulator) and outputs a power supply voltage VDD (reference Fig.34 , Fig.35 ).

[0259] In some embodiments, the portable fan is used Fig.30 , 34 In the case of the current detection circuit 062 shown, the controller 02 can control the operation of the three-phase micro motor by using a six-step commutation (ie, square wave) control method based on the sampled total drive current IR_SUIM and back electromotive force.

[0260] In some embodiments, the portable fan is used Fig.34 , 35 In the case of the current detection circuit 062 shown, the controller 02 can control the three-phase micromotor 04 to operate by FOC control based on the three-phase detection current of the three-phase micromotor 04 obtained by sampling or calculation after sampling.

[0261] The controller 02 is also used to control the driving bridge circuit 03 to output a sinusoidal three-phase alternating current to the three-phase micro motor 04 based on the output voltage of the rechargeable battery, and control the rotation of the three-phase micro motor 04 in a FOC control manner. Specifically:

[0262] ① Sample the three-phase currents of the three-phase micromotor 04 respectively to obtain the three-phase currents: ia, ib, ic;

[0263] ② The three-phase currents ia, ib, ic are transformed by Clarke to obtain the currents in the two-phase stationary coordinate system: iα, iβ;

[0264] ③Use Park transformation to transform iα and iβ to obtain the current in the two-phase rotating coordinate system: iq and id;

[0265] ④ Calculate the error between iq, id and the corresponding given values ​​iq_Ref, id_Ref;

[0266] ⑤ Input the above error into two PI (proportional-integral) controllers to obtain the output control voltages Vq and Vd;

[0267] ⑥ Perform inverse park transformation on the control voltages Vq and Vd to obtain the voltages Vα and Vβ in the two-phase stationary coordinate system;

[0268] ⑦ Input Vα and Vβ into the SVPWM (Space Vector Pulse Width Modulation) module for modulation, synthesize the voltage space vector, output the switch state of the three drive bridge arms at that moment, and then control the motor rotation.

[0269] The above steps are repeated to implement FOC control based on the sinusoidal three-phase AC output for the three-phase micromotor 04. Since the sinusoidal three-phase AC has the characteristic of smooth changes, the current mutation is small (relative to square wave AC) during driving the three-phase micromotor 04, and the control is precise, which can make the power consumption and noise of the motor relatively low, so that the portable fan can achieve low power consumption, low noise and long battery life.

[0270] See also Fig.23 and Fig.28 As an implementation mode, the present application also provides a three-phase micro motor for a portable fan.

[0271] The portable fan includes a portable fan based on a three-phase micromotor as described above, the three-phase micromotor includes a stator coil and a rotor assembly, the rotor assembly includes a rotating shaft 18A connected to the fan blades 19 of the portable fan, a bearing sleeved on the rotating shaft 18A and a magnetic ring assembly 18 driven to rotate by the stator coil, and the drive bridge circuit 03 in the portable fan is connected to the three electrodes of the stator coil.

[0272] Specifically, Fig.23 In the figure, the fan bearing 15 is the bearing of the three-phase micro motor. Fig.23 The motor 12 marked by the reference numeral 12 is actually also a stator coil of a three-phase micro motor.

[0273] In some embodiments, the three-phase micromotor is an outer rotor motor, the magnetic ring assembly 18 is arranged between the stator coil and the fan blade hub of the portable fan (i.e., the hub of the fan blade 19), the bearing 15 is sleeved outside the rotating shaft 18A, and the rotating shaft 18A is inserted and fixed in the shaft cylinder 15A through the bearing 15, and the stator coil is fixed outside the shaft cylinder 15A. Optionally, the three-phase micromotor also includes a snap ring 13 and a gasket 14, and the snap ring 13 and the gasket 14 are used together to limit the rotating shaft 18A to the shaft cylinder 15A to prevent the rotating shaft 18A from detaching from the shaft cylinder 15A. After the stator coil is energized, a magnetic field is generated to drive the magnetic ring assembly 18 to drive the fan blade 19 to rotate.

[0274] In this embodiment, the three-phase micromotor of the outer rotor is driven by three-phase alternating current, which increases the torque, further achieves energy saving, and increases the battery life by about 30%.

[0275] In some embodiments, the three-phase micromotor is an inner rotor motor, the magnetic ring assembly 18 of the inner rotor motor is arranged inside the stator coil, the rotating shaft 18A is fixed inside the magnetic ring assembly 18, the stator coil is fixed to the inner wall of the portable fan, the rotating shaft 18A is fixed to the inner wall of the portable fan by a bearing sleeve, and the fan blade 19 is fixed to one end of the rotating shaft 18A.

[0276] As an implementation method, the present application also provides a three-phase micro motor blower module for a portable fan. Fig.28 The three-phase micro motor fan module includes a drive bridge circuit 03, a three-phase micro motor 04 and a fan blade 19 (see Figure 23 to Figure 25 As shown), the fan blades 19 are connected to the three-phase micromotor 04, and the three output ends of the driving bridge circuit 03 are connected to the three electrodes of the three-phase micromotor 04, wherein the driving bridge circuit 03 is used to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor 04 to start, stop or change speed.

[0277] It is understandable that the three-phase micro-motor fan module of this embodiment is a modular independent component / product that can be sold or used independently, or assembled with other fan components or a fan body to form a portable fan. Among them, the other fan components or the fan body include, for example, a housing 1, a power supply circuit 01, and a controller 02.

[0278] In some embodiments, the output voltage of the portable fan is 3V to 4.2V or 6V to 8.4V, the portable fan has one, two or more rechargeable batteries, and the three-phase micromotor 04 includes an outer rotor three-phase micromotor, so as to improve the efficiency of the use of the rechargeable battery through the large torque outer rotor three-phase micromotor and thus increase the battery life during portable use.

[0279] It is understood that the output voltage of the portable fan refers to the output voltage of other fan components or the fan body that can be used to install the three-phase micro-motor fan module. The output voltage can be provided by a rechargeable battery, or the rechargeable battery is provided through a conversion circuit. The terminal outputting the output voltage will be connected to the power supply bus of the driving bridge circuit 03, and the output voltage is connected to the driving bridge circuit 03.

[0280] It can be understood that the controller 02 in other fan components or the fan body will be used to provide a control signal to control the drive bridge circuit 03 to generate a sinusoidal three-phase alternating current.

[0281] See also Figure 28 to Figure 31 As an implementation mode, the present application also provides a driving bridge circuit 03, which can be used for the three-phase micro motor fan module of any of the above embodiments or the portable fan of any of the above embodiments.

[0282] The driving bridge circuit 03 includes a circuit substrate (not shown) and three output terminals A / B / C formed on the circuit substrate, wherein the three output terminals A / B / C are respectively connected to three electrodes U / V / W of the three-phase micromotor 04 of the portable fan, wherein the driving bridge circuit U / V / W is used to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor 04 to start, stop or change speed.

[0283] It is understandable that the drive bridge circuit 03 can be used as a modular component, can be independently manufactured or sold, and can be used in a three-phase micro motor fan module or a portable fan, and can also be used in other application fields.

[0284] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A three-phase micromotor fan module for a portable fan, characterized in that: The three-phase micromotor fan module includes a drive bridge circuit, a three-phase micromotor and fan blades, the fan blades are connected to the three-phase micromotor, and the three output ends of the drive bridge circuit are connected to the three electrodes of the three-phase micromotor, wherein the drive bridge circuit is used to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor to start, stop or change speed.

2. The three-phase micro motor fan module according to claim 1, characterized in that: The driving bridge circuit includes three driving bridge arms, each of which includes an upper bridge arm and a lower bridge arm connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus, and the three series nodes of the three driving bridge arms constitute the three output ends of the driving bridge circuit, and the controlled ends of the three upper bridge arms and the controlled ends of the three lower bridge arms are respectively used to connect to the six control pins of the controller of the portable fan.

3. The three-phase micro motor fan module according to claim 2, characterized in that: Each of the upper bridge arms includes a first switch tube, and each of the lower bridge arms includes a second switch tube. The first switch tube and the second switch tube are connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus. A series node between the first switch tube and the second switch tube constitutes an output end of the drive bridge circuit.

4. The three-phase micro motor fan module according to claim 3, characterized in that: Each upper bridge arm further includes a third switch tube, the control end of the first switch tube is connected to the first end of the third switch tube, the second end of the third switch tube is grounded, and the control end of the third switch tube constitutes the controlled end of the upper bridge arm.

5. The three-phase micro motor fan module according to any one of claims 1 to 4, characterized in that: The output voltage of the portable fan is 3V to 4.2V or 6V to 8.4V. The portable fan has one, two or more rechargeable batteries. The three-phase micromotor includes an outer rotor three-phase micromotor, which improves the efficiency of using the rechargeable battery through the large-torque outer rotor three-phase micromotor and thus increases the battery life during portable use.

6. A portable fan based on a three-phase micromotor, characterized in that: The portable fan comprises a shell, and a power supply circuit, a controller, a drive bridge circuit, a three-phase micromotor and fan blades installed in the shell, the fan blades are connected to the three-phase micromotor, the power supply circuit comprises a rechargeable battery, the power supply circuit is connected to the power supply end of the controller and the power supply bus of the drive bridge circuit, the control pin of the controller is used to be connected to the controlled end of the drive bridge circuit, the three output ends of the drive bridge circuit are connected to the three electrodes of the three-phase micromotor, and the controller is used to output a control signal to control the drive bridge circuit to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor to start, stop or change speed.

7. The portable fan according to claim 6, characterized in that The driving bridge circuit includes three driving bridge arms, each of which includes an upper bridge arm and a lower bridge arm connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus, and the three series nodes of the three driving bridge arms constitute the three output ends of the driving bridge circuit, and the controlled ends of the three upper bridge arms and the controlled ends of the three lower bridge arms are respectively used to connect to the six control pins of the controller.

8. The portable fan according to claim 7, characterized in that Each of the upper bridge arms includes a first switch tube, and each of the lower bridge arms includes a second switch tube. The first switch tube and the second switch tube are connected in series between the positive pole of the power supply bus and the negative pole of the power supply bus. A series node between the first switch tube and the second switch tube constitutes an output end of the drive bridge circuit. A control end of the first switch tube is used to connect to a control pin of the controller, and a control end of the second switch tube is used to connect to a control pin of the controller.

9. The portable fan according to claim 8, characterized in that Each upper bridge arm further includes a third switch tube, the control end of the first switch tube is connected to the first end of the third switch tube, the second end of the third switch tube is grounded, and the control end of the third switch tube constitutes the controlled end of the upper bridge arm.

10. The portable fan according to any one of claims 6 to 9, characterized in that: The portable fan further comprises a three-phase micromotor fan module, and the three-phase micromotor fan module comprises the drive bridge circuit, the three-phase micromotor and the fan blades.

11. The portable fan according to any one of claims 6 to 9, characterized in that: Also includes: An input module, the input module is connected to the controller, and the input module is used to generate an input signal to the controller under the operation of a user; A detection circuit, which is connected to the controller, the drive bridge circuit and the three-phase micromotor and is used to detect and output working electrical parameters of the three-phase micromotor and the drive bridge circuit; The controller is also used to modulate the control signal according to the input signal and the working electrical parameter to adjust the three-phase alternating current, thereby achieving speed regulation, starting or stopping of the three-phase micromotor.

12. The portable fan according to claim 11, characterized in that The detection circuit comprises: A voltage detection circuit is connected to the positive electrode of the power supply bus, and is used to detect the power supply voltage of the power supply circuit and output a voltage detection signal; A current detection circuit is connected to the negative pole of the power supply bus, and is used to detect the working current of the three-phase micro motor and output a current detection signal; The back electromotive force detection circuit is connected to the three output terminals of the driving bridge circuit and is used for detecting and outputting the back electromotive force of the three-phase micro motor.

13. The portable fan according to claim 11, characterized in that The detection circuit also includes an overcurrent protection circuit, which is connected to the negative pole of the power supply bus and is used to output an overcurrent trigger signal when the working current of the three-phase micromotor reaches an overcurrent threshold; The controller is also used to control the drive bridge circuit to shut off the output of the three-phase alternating current according to the overcurrent trigger signal.

14. The portable fan according to claim 12, wherein: The current detection circuit comprises: A first sampling resistor is connected in series to the negative electrode of the power supply bus between the power supply circuit and the driving bridge circuit; and a first differential amplifier circuit, wherein a positive input terminal and a negative output terminal of the first differential amplifier circuit are respectively connected to two ends of the first sampling resistor, and an output terminal of the first differential amplifier circuit is connected to the controller; or The current detection circuit comprises: Two second sampling resistors are respectively connected in series to one end of the negative electrode of the power supply bus to which any two driving bridge arms of the driving bridge circuit are connected; and Two second differential amplifier circuits, the two second differential amplifier circuits are respectively connected to the two second sampling resistors, and the output ends of the two second differential amplifier circuits are connected to the controller; Wherein, the positive input terminal and the negative output terminal of each second differential amplifier circuit are respectively connected to the two ends of the corresponding second sampling resistor; or The current detection circuit comprises: Three second sampling resistors are respectively connected in series to one end of the negative electrode of the power supply bus to which the three driving bridge arms of the driving bridge circuit are connected; and three second differential amplifier circuits, the three second differential amplifier circuits are respectively connected to the three second sampling resistors, and the output ends of the three second differential amplifier circuits are connected to the controller; Wherein, the positive input terminal and the negative output terminal of each second differential amplifier circuit are respectively connected to the two ends of the corresponding second sampling resistor.

15. The portable fan according to claim 12, characterized in that The back-electromotive force detection circuit includes three back-electromotive force detection sub-circuits, each of which includes a first voltage divider, a second voltage divider and a filter, the first voltage divider and the second voltage divider are connected in series between the corresponding electrodes of the three-phase micromotor and the ground terminal, the second voltage divider is connected in parallel with the filter, and the series node of the first voltage divider and the second voltage divider is also connected to the back-electromotive force reference pin and the back-electromotive force detection pin of the controller.

16. The portable fan according to claim 11, characterized in that The input module includes at least one of a button input unit, a touch input unit, and a voice input unit.

17. The portable fan according to any one of claims 6 to 9, characterized in that: The output voltage of the rechargeable battery is 3V to 4.2V or 6V to 8.4V. The rechargeable battery is 1, 2 or more. The power supply circuit also includes a power supply circuit. The positive electrode of the rechargeable battery is used to connect to the positive electrode of the power supply bus of the drive bridge circuit and the positive electrode of the power supply circuit. The negative electrode of the rechargeable battery is used to connect to the negative electrode of the power supply bus of the drive bridge circuit and the negative electrode of the power supply circuit. The output of the power supply circuit is connected to the power supply end of the controller.

18. The portable fan according to claim 17, wherein: The controller is also used to drive the driving bridge circuit to output a sinusoidal three-phase alternating current to the three-phase micromotor based on the output voltage of the rechargeable battery, and control the rotation of the three-phase micromotor in a magnetic field vector control manner.

19. A driving bridge circuit for a three-phase micro-motor fan module as claimed in any one of claims 1 to 5, or for a portable fan as claimed in any one of claims 6 to 18, characterized in that: The driving bridge circuit includes a circuit substrate and three output ends formed on the circuit substrate, wherein the three output ends are respectively connected to three electrodes of the three-phase micromotor of the portable fan, wherein the driving bridge circuit is used to generate a sinusoidal three-phase alternating current to drive the three-phase micromotor to start, stop or change speed.

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