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

Abstract

The utility model 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 technical field of electronic circuits, in particular to a three-phase micro motor fan module for a portable fan, a portable fan based on a three-phase micro motor, and a drive bridge circuit for the three-phase micro motor fan module or the portable fan. BACKGROUND

[0002] Users who have used portable fans will know that the motor speed of portable fans is relatively slow, the wind speed and wind volume are limited, and the vibration and noise are relatively large, which results in that users cannot obtain the best comfortable experience in different environments and needs.

[0003] Because the existing general single-phase motor is used, in contrast, the working speed of the three-phase motor can be tens of thousands to hundreds of thousands of revolutions per minute (RPM). However, due to the need for powerful power support, the three-phase motor is usually powered by mains electricity 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 field of three-phase motors mainly involves industrial equipment, power tools, aerospace and automobiles, etc. For example, in industrial equipment, high-speed rotation of high-speed motors is needed in machine tools to improve production efficiency and machining precision, and high-speed rotation of high-speed motors is needed in automobiles to improve power output and fuel efficiency.

[0004] Before 2022, there was no precedent in the entire industry to apply three-phase motors to small portable fans. This is because the high cost and high power consumption characteristics of high-speed motors are not consistent with the low cost and low power consumption requirements of small portable fans. Until 2023, the present applicant first promoted the landing of three-phase motors to portable fans and received high recognition from consumers at home and abroad, which also drove the rapid development of the entire industry. However, since 2023, whether it is the present applicant's product or the same product of the same industry, the three-phase motor is driven by a square wave, and the square wave driving has obvious technical defects, such as loud noise, obvious jitter, and sharp sound of the motor and its shaft. Therefore, the inventors of the present application have been trying to solve the mixed noise problem of square wave driving.

[0005] In two years, the applicant and his inventors investigated the entire motor industry, such as Dyson, Leifeng, Dongguan air-cooled, Zhongqi motor, Hengchi motor, DJI and Dechang motor, and found that the research and development of three-phase motor miniaturization was very lacking, and there was no in-depth study on motor noise. Micro-motor and its control technology stagnate, especially the handheld portable dust blower and handheld fan on the market, the noise is annoying, and the endurance can only maintain less than 20 minutes, especially the fan equipment using three-phase motor, the howling sound accompanied by the start can be transmitted to a range of about 100 meters. Even the DJI company's drone, when flying in the sky, the noise of the airflow and the motor roar is believed to be deeply experienced by everyone who has come into contact with it. Obviously, the technology of three-phase motor in micro motor needs to be developed, especially how to control the drive of three-phase motor in micro motor, new application technology is urgently needed. Content of the utility model

[0006] The embodiment of the application provides a three-phase micro motor fan module for a portable fan, a portable fan based on a three-phase micro motor and a drive bridge circuit for the three-phase micro motor fan module or the portable fan, to solve the above technical problems.

[0007] The first aspect of the embodiment of the application provides a three-phase micro motor fan module for a portable fan, the three-phase micro motor fan module comprising a drive bridge circuit, a three-phase micro motor and a fan blade, the fan blade being connected with the three-phase micro motor, three output ends of the drive bridge circuit being connected with three electrodes of the three-phase micro motor, wherein the drive bridge circuit is used for generating a three-phase alternating current of a sine wave to drive the three-phase micro motor to start, stop or change speed.

[0008] In some embodiments, the drive bridge circuit comprises three drive bridge arms, each of the drive bridge arms comprising an upper bridge arm and a lower bridge arm connected in series between a positive power bus and a negative power bus, three series nodes of the three drive bridge arms constituting 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 being respectively connected to six control pins of the portable fan controller.

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

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

[0011] In some embodiments, the output voltage of the portable fan is 3-4.2 volts or 6-8.4 volts, the rechargeable battery of the portable fan is one, two or more sections, and the three-phase micro motor comprises an outer rotor three-phase micro motor to improve the use efficiency of the rechargeable battery and thus the endurance time during portable use.

[0012] The second aspect of the embodiments of the present application provides a portable fan based on a three-phase micro motor, which comprises a housing, and a power supply circuit, a controller, a drive bridge circuit, a three-phase micro motor and a fan blade installed in the housing. The fan blade is connected to the three-phase micro motor. The power supply circuit comprises a rechargeable battery. The power supply circuit is connected to a power supply end of the controller and a power supply bus of the drive bridge circuit. A control pin of the controller is used to connect to a controlled end of the drive bridge circuit. Three output ends of the drive bridge circuit are connected to three electrodes of the three-phase micro motor. The controller is used to output a control signal to control the drive bridge circuit to generate a three-phase alternating current of a sine wave or a square wave to drive the three-phase micro motor to start, stop or change speed.

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

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

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

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

[0017] In some embodiments, further comprising:

[0018] an input module connected to the controller, the input module configured to generate an input signal to the controller in response to a user operation;

[0019] a detection circuit connected to the controller, the drive bridge circuit and the three-phase micromotor, the detection circuit configured to detect and output operating electrical parameters of the three-phase micromotor and the drive bridge circuit;

[0020] the controller further configured to modulate the control signal according to the input signal and the operating electrical parameters to adjust the three-phase alternating current, thereby achieving speed adjustment, start-up or shutdown of the three-phase micromotor.

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

[0022] a voltage detection circuit connected to the positive pole of the power supply bus, the voltage detection circuit configured to detect the supply voltage of the power supply circuit and output a voltage detection signal;

[0023] a current detection circuit connected to the negative pole of the power supply bus, the current detection circuit configured to detect the operating current of the three-phase micromotor and output a current detection signal;

[0024] a back electromotive force detection circuit connected to the three output terminals of the drive bridge circuit, the back electromotive force detection circuit configured to detect the back electromotive force of the three-phase micromotor and output a back electromotive force detection signal.

[0025] In some embodiments, the detection circuit further comprises an overcurrent protection circuit connected to the negative pole of the power supply bus, the overcurrent protection circuit configured to output an overcurrent trigger signal when the operating current of the three-phase micromotor reaches an overcurrent threshold.

[0026] the controller further configured to control the drive bridge circuit to shut off the output of the three-phase current according to the overcurrent trigger signal.

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

[0028] a first sampling resistor connected in series to the negative pole of the power supply bus between the power supply circuit and the drive bridge circuit; and

[0029] a first differential amplification circuit, the positive input terminal and the negative output terminal of the first differential amplification circuit connected to the two ends of the first sampling resistor respectively, and the output terminal of the first differential amplification circuit connected to the controller.

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

[0031] two second sampling resistors, each connected in series at one end of a negative power bus connected to any two drive bridge arms of the drive bridge circuit; and

[0032] two second differential amplification circuits, each connected to a corresponding second sampling resistor, and the output ends of the two second differential amplification circuits being connected to the controller.

[0033] The positive input end and the negative output end of each second differential amplification circuit are connected to the two ends of a corresponding second sampling resistor.

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

[0035] three second sampling resistors, each connected in series at one end of a negative power bus connected to any three drive bridge arms of the drive bridge circuit; and

[0036] three second differential amplification circuits, each connected to a corresponding second sampling resistor, and the output ends of the three second differential amplification circuits being connected to the controller.

[0037] The positive input end and the negative output end of each second differential amplification circuit are connected to the two ends of a corresponding second sampling resistor.

[0038] In some embodiments, the back electromotive force detection circuit comprises three back electromotive force detection sub-circuits, each back electromotive force detection sub-circuit comprising a first voltage divider, a second voltage divider, and a filter, the first voltage divider and the second voltage divider being connected in series between a corresponding electrode of the three-phase micromotor and a ground end, the second voltage divider being connected in parallel with the filter, and the series connection node of the first voltage divider and the second voltage divider being further connected to a back electromotive force reference pin and a back electromotive force detection pin of the controller.

[0039] In some embodiments, the input module comprises 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 one, two, or more sections, the power supply circuit further comprises a power supply circuit, the positive electrode of the rechargeable battery is used to be connected to the positive power 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 be connected to the negative power 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 configured to drive the drive bridge circuit to output a three-phase alternating current of a sine wave based on an output voltage of the rechargeable battery to the three-phase micromotor to control the three-phase micromotor to rotate in a magnetic field vector control manner.

[0042] The third aspect of the embodiments of the present application provides a three-phase micromotor fan module for any of the above embodiments, or a drive bridge circuit of a portable fan for any of the above embodiments, the drive bridge circuit comprising a circuit substrate and three output terminals formed on the circuit substrate, the three output terminals being connected to three electrodes of a three-phase micromotor of the portable fan respectively, wherein the drive bridge circuit is configured to generate a three-phase alternating current of a sine wave to drive the three-phase micromotor to start, stop or change speed.

[0043] The technical effects of the embodiments of the present application are as follows: the technical scheme of the embodiments of the present application uses a controller to directly control a drive bridge circuit to generate a three-phase alternating current to drive a three-phase micromotor, so as to realize the start, stop or speed change of the three-phase micromotor. On the one hand, the drive chip of the drive bridge circuit is omitted, and the cost is saved, and at the same time, the low-voltage driving and strategy control of the three-phase micromotor are realized. On the other hand, based on the use of a three-phase current of a sine wave to drive the three-phase micromotor, compared with the square wave three-phase current driving, the driving current is smoother, the noise and power consumption of the three-phase micromotor are greatly reduced, the endurance is improved, a high-efficiency, low-noise, adjustable wind speed, long-endurance portable fan solution is provided, and the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

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

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

[0048] Figure 4 is a circuit diagram of a touch and slide adjustment chip in a portable fan based on a three-phase micromotor provided by the first aspect of the embodiments of the present application;

[0049] Figure 5 is a circuit diagram of a touch screen connecting seat in a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

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

[0051] Figure 7 is a circuit diagram of a single-touch touch screen chip in a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0052] Figure 8 is another structural schematic diagram of a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0053] Figure 9 is a structural schematic diagram of a voice module in a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0054] Figure 10 is a circuit diagram of a voice acquisition module in a voice module in a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0055] Figure 11 is a circuit diagram of a voice recognition module in a voice module in a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0056] Figure 12 is a structural schematic diagram of a voice output module in a voice module in a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0057] Figure 13 is a circuit diagram of a voice output module in a voice module in a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0058] Figure 14 is another structural schematic diagram of a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

[0059] Figure 15 is another structural schematic diagram of a portable fan based on a three-phase micro motor provided by the embodiment one of the present application;

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

[0061] Figure 17Figure 1 is a structural schematic diagram of a motor in a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0062] Figure 18 Figure 2 is a circuit diagram of a driving module in the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0063] Figure 19 Figure 3 is another circuit diagram of the driving module in the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0064] Figure 20 Figure 4 is another structural schematic diagram of the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0065] Figure 21 Figure 5 is a structural exploded view of an embodiment of the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0066] Figure 22 Figure 6 is a structural exploded view of another embodiment of the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0067] Figure 23 Figure 7 is a first partial structural exploded view of the another embodiment of the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0068] Figure 24 Figure 8 is a second partial structural exploded view of the another embodiment of the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0069] Figure 25 Figure 9 is a third partial structural exploded view of the another embodiment of the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0070] Figure 26 Figure 10 is a structural schematic diagram of the another embodiment of the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0071] Figure 27 Figure 11 is a flow chart of a control method of a portable fan according to an embodiment of the present application;

[0072] Figure 28 Figure 12 is a structural schematic diagram of a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0073] Figure 29 Figure 13 is a structural schematic diagram of a driving bridge circuit in the portable fan based on the three-phase micro motor according to the embodiment of the present application;

[0074] Figure 30 is a circuit schematic diagram of a drive bridge circuit in a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0075] Figure 31 is a circuit schematic diagram of a drive bridge circuit in a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0076] Figure 32 is a structural schematic diagram of a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0077] Figure 33 is a structural schematic diagram of a detection circuit in a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0078] Figure 34 is a circuit schematic diagram of a current detection circuit in a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0079] Figure 35 is a circuit schematic diagram of a current detection circuit in a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0080] Figure 36 is a circuit schematic diagram of a back electromotive force detection circuit in a portable fan based on a three-phase micro motor according to an embodiment of the present application;

[0081] Part of the figure mark is as follows:

[0082] 102, control module; 103, drive module; 105, rotation 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, loudspeaker; 201, manual switch module; 202, wireless module; 203, atomization module; 204, refrigeration module; 205, heating module; 206, lighting module; 207, shaking 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 amplification circuit; 0622, first second differential amplification circuit; 0623, second second differential amplification circuit;

[0084] Embodiment one, two: 101, input module; 104, three-phase micro motor;

[0085] Embodiment three: 05, input module;

[0086] Embodiment three, four, five, six: 04, three-phase micro motor. DETAILED DESCRIPTION

[0087] In order to thoroughly understand the present application, detailed structures and steps will be proposed in the following description in order to explain the technical solutions proposed by the present application. The preferred embodiments of the present application are described in detail as follows, however, in addition to these detailed descriptions, the present application can also have other implementation manners.

[0088] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, therefore, only serve as examples, and cannot limit the protection scope of the present application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0090] 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 "a plurality of" is two or more, unless otherwise explicitly specified.

[0091] Reference to an "example" in this text means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same example, or are necessarily mutually exclusive or alternative examples. It is expressly understood that the examples described herein can be combined with each other in their various permutations and combinations.

[0092] In the description of the embodiments of the application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0093] In the description of the embodiments of the application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0094] In the description of the embodiments of the application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0095] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0096] Example One

[0097] The first embodiment of the application provides a portable fan, which solves the problem that the user experience is poor because the user cannot adjust the wind speed of any gear as needed in the prior art by using a mechanical switch.

[0098] Embodiment 1 of this application provides a portable fan based on a three-phase micro motor, such as... Figure 1 As shown, the system includes: a control module 102, a drive module 103, and a three-phase micro motor 104. The three-phase micro motor 104 has an operating voltage of 2 to 18 volts, an operating current of 0.1 to 10 amps, and / or a rated operating power of 0.5 to 100 watts. The control module 102 controls the rated operating speed of the three-phase micro motor 104 through the drive module 103 according to the operating voltage, operating current, and / or rated operating power, so as to reduce the high-speed noise of the three-phase micro motor 104 and control the wind speed within a preset wind speed range.

[0099] This technical solution utilizes the coordinated operation of the control module 102 and the drive module 103 to achieve low-voltage drive of a three-phase micro motor, meeting the specific needs of a portable fan. This requires adjusting the number of slots and pole pairs to adapt to low-voltage operation, selecting high-performance core materials to reduce magnetic losses and improve efficiency under low voltage, and installing a high-efficiency inverter to convert low-voltage DC power into three-phase AC power, ensuring power supply stability and preventing voltage fluctuations from affecting motor performance.

[0100] The three-phase micro motor 104 features an operating voltage range of 2 to 18 volts, an operating current range of 0.1 to 10 amps, and a rated power range of 0.5 to 100 watts. Its design enables it to provide more efficient speed and power output than existing portable fan motors at low voltages, making it suitable for portable devices. The control module 102 precisely controls the three-phase micro motor 104 based on real-time monitoring of the operating voltage, operating current, and rated power. By adjusting the power supply parameters of the three-phase micro motor 104, the control module 102 effectively reduces noise generated during high-speed motor operation. The control module 102 can also adjust the fan speed to a preset range, ensuring user comfort and device stability compared to single-phase low-speed motors. The drive module 103 connects the control module 102 and the three-phase micro motor 104, converting the instructions from the control module 102 into actual motor drive signals. The drive module 103 uses high-efficiency inverter technology to convert low-voltage DC power into AC power suitable for the three-phase micro motor 104, ensuring efficient operation of the motor. Under different working conditions, the drive module 103 adjusts the motor speed and output power according to the instructions from the control module 102.

[0101] The technical effect of the embodiment is that the technical solution combines the control module, the driving module and the three-phase micromotor to provide a portable fan solution with high efficiency, low noise and adjustable wind speed. Through low-voltage driving technology and accurate control strategy, the portability and use comfort of the fan are improved, and the overall performance and energy efficiency of the equipment are effectively improved. The design solution is suitable for portable fan application scenarios that require high performance and low noise, and fills the gap in the application of three-phase micromotors in small portable devices.

[0102] The specific application of the first embodiment includes but is not limited to the following implementation ways:

[0103] As an implementation way, the working voltage of the three-phase micromotor 104 is 6 to 8.4 volts, the working current of the three-phase micromotor 104 is 0.12 to 1 ampere, and / or the rated working power of the three-phase micromotor 104 is 0.8 to 9 watts, and the control module 102 controls the rated working speed of the three-phase micromotor 104 through the driving module 103 according to the working voltage, the working current and / or the rated working power. 6000-15000RPM / MIN.

[0104] Among them, the three-phase micromotor 104 is driven by 6-8.4V voltage range, suitable for two batteries in series power supply, the working current range is 0.12-1A, which ensures stable operation at different speeds, and the power range is 0.8W-9W, which meets the power demand of portable fans. 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 6000-15000RPM. The driving module 103 converts 6-8.4V DC into three-phase AC to drive the three-phase micromotor 104 through inverter technology. Two batteries are used in series to provide stable voltage. The fan has 4 pairs of pole pairs, 12 slots, 5 blades, and 6 guide vanes / impellers.

[0105] As an implementation way, the working voltage of the three-phase micromotor 104 is 5.9 to 8.4 volts, the working current of the three-phase micromotor 104 is 0.5 to 6 amperes, and / or the rated working power of the three-phase micromotor 104 is 5 to 50 watts, and the control module 102 controls the rated working speed of the three-phase micromotor 104 through the driving module 103 according to the working voltage, the working current and / or the rated working power. 20000-80000RPM / MIN.

[0106] The three-phase micro motor 104 is driven in a voltage range of 5.9-8.4V, which can be 5.9V, 6.0V, 6.5V, 7.2V, …, 8.4V, and is suitable for two-battery series power supply. The working current range is 0.5-6A, which ensures stable operation at different speeds. The power range is 5W-50W, which meets the power demand of portable fans. 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 to drive the three-phase micro motor 104 through inverter technology. Two batteries are used in series to provide stable voltage. The fan has 1 pair of pole pairs, 6 slots, 13 blades, and 6 guide vanes / impellers.

[0107] As an embodiment, the working voltage of the three-phase micro motor 104 is 2 to 5.8 volts, the working current of the three-phase micro motor 104 is 0.25 to 2 amps, and / or the rated working power of the three-phase micro motor 104 is 1 to 8 watts, and the control module 102 controls the rated working speed of the three-phase micro motor 104 through the drive module 103 according to the working voltage, the working current and / or the rated working power. 15000-41000RPM / MIN.

[0108] The three-phase micro motor 104 is driven in a voltage range of 2-5.8V, which can be 2V, 2.1V, 2.5V, 3.7, …, 4.3V, 5.8V, and is suitable for two-battery series power supply. The working current range is 0.25-1.8A, which ensures stable operation at different speeds. The power range is 1W-8W, which meets the power demand of portable fans. 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 to drive the three-phase micro motor 104 through inverter technology. Two batteries are used in series to provide stable voltage. The fan has 4 pairs of pole pairs, 9 slots, 9 blades, and 7 guide vanes / impellers.

[0109] As an embodiment, the working voltage of the three-phase micro motor 104 is 8.5 to 12.6 volts, the working current of the three-phase micro motor 104 is 0.5 to 5 amps, and / or the rated working power of the three-phase micro motor 104 is 6 to 60 watts, and the control module 102 controls the rated working speed of the three-phase micro motor 104 through the drive module 103 according to the working voltage, the working current and / or the rated working power. 25000-85000RPM / MIN.

[0110] wherein the three-phase micromotor 104 is driven with 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 in series for power supply, the working current range is 0.5-5A, ensuring stable operation at different speeds, the power range is 6W-60W, meeting the power demand of portable fans. 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 three batteries in series to provide stable voltage. The pole pair number of the fan is 1 pair, the slot number is 6 slots, the blade number is 13 pieces, and the guide vane / impeller number is 6 pieces.

[0111] As an embodiment, the working voltage of the three-phase micromotor 104 is 12 to 18 volts, the working current of the three-phase micromotor 104 is 0.1 to 1 ampere, and / or the rated working power of the three-phase micromotor 104 is 2 to 16 watts, and 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, the working current and / or the rated working power. 2000-6000RPM / MIN.

[0112] wherein the three-phase micromotor 104 is driven with a voltage range of 12-18V, which can be 12V, 12.5V, 14V, 16.8V, …, 18V, suitable for four batteries in series for power supply, the working current range is 0.1-1A, ensuring stable operation at different speeds, the power range is 2W-16W, meeting the power demand of portable fans. 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 four batteries in series to provide stable voltage. The pole pair number of the fan is 4 pairs, the slot number is 6 slots, the blade number is 9 pieces, and the guide vane / impeller number is 10 pieces.

[0113] As an embodiment, the present embodiment provides a portable fan, such as Figure 2As shown, it comprises: an input module 101, a control module 102, a driving module 103 and a three-phase micro motor 104 connected in sequence, the driving module 103 comprises a first bridge arm, a second bridge arm and a third bridge arm, and each bridge arm comprises an upper bridge arm switch tube and a lower bridge arm switch tube on both sides of the midpoint of the bridge arm, 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 rotating speed of the three-phase micro motor 104.

[0114] Among them, the input module 101 also outputs a switch signal according to the 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 operation.

[0115] 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 multiple 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, the input module 101 generates a switch signal when a touch action is detected, and generates a wind speed adjustment signal when a sliding action is detected. 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 user-set wind speed adjustment parameter. The input module 101 can also be a multifunction input module, which can realize functions such as timing control, light control, head shaking control, spray control, refrigeration control, etc. 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. The 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 head shaking function refers to the user setting the head shaking angle and speed of the fan through the touch module 111, or remotely controlling the head shaking function through the voice module 112 and the networking module 106. The spray function refers to the user turning on or adjusting the spray amount through the touch module 111, or remotely controlling the spray function through the voice module 112 and the networking module 106. The refrigeration function refers to the user adjusting the refrigeration intensity of the fan through the touch module 111, or remotely controlling the refrigeration function through the voice module 112 and the networking module 106. Through the input module, multiple function controls are realized, which enables the user to use and adjust the fan more flexibly, and meets the needs of different use scenarios.

[0116] The input module 101 and the control module 102 are connected through wired or wireless means, and the input module is arranged on the portable fan shell or other electronic devices.

[0117] The input module 101 and the control module 102 are connected by wired means, such as I2C connection line, SPI connection line, UART connection line, GPIO interface, USB interface, CAN bus, I2S interface, and ADC interface. The I2C connection line (Inter-Integrated Circuit) is a serial communication protocol commonly used to connect low-speed peripheral devices (such as touch modules) to the motherboard, using two lines (SDA and SCL) for data transmission and clock synchronization. The SPI connection line (Serial Peripheral Interface) is a high-speed synchronous serial communication protocol that uses four lines (MISO, MOSI, SCK, and SS) for data transmission. The UART connection line (Universal Asynchronous Receiver-Transmitter) is an asynchronous serial communication protocol that uses two lines (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 swapping. The CAN bus (Controller Area Network) is a serial communication protocol for industrial automation with high reliability and real-time performance. The I2S interface (Integrated Interchip Sound) is a serial bus standard for audio data transmission. The ADC interface (Analog-to-Digital Converter) is an interface that converts analog signals to digital signals. Through wireless communication technologies such as Wi-Fi, Bluetooth, Zigbee, etc., signal transmission between the input module 101 and the control module 102 is achieved. The input module 101 is directly integrated on the shell of the portable fan, suitable for situations where users want to operate directly on the fan, such as adjusting the fan speed through the touch screen or turning on / off the fan through the key switch. The input module 101 can also be separated from the portable fan and installed on other electronic devices (such as smartphones, tablets, smartwatches, etc.), connected to the control module of the fan through wireless means, making the control of the portable fan more flexible and convenient, and users can control remotely through existing electronic devices. The wireless module can be a Bluetooth module, a Wi-Fi module, an infrared module, a 433MHz wireless module, and 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 signals of the input module 101 and processes the signals, generates a switch control signal according to the switch signal, which is used to control the start or stop of the three-phase micromotor 104, and calculates the control signal for adjusting 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 protocol. Among them, the 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 high level time to period). The PPM signal transmits information by changing the position of the pulse in a period. The data protocol can be a standard communication protocol (such as I2C, SPI, UART) or a custom communication protocol, which is used to transmit more complex control instructions. The custom protocol designs specific control signal formats and transmission methods according to specific application requirements. If the input module 101 is the voice module 112, the control module 102 generates the switch control signal and the PWM control signal according to the switch signal and the wind speed adjustment control signal. If the input module 101 is the networking module 106, the control module 102 generates the corresponding control signal according to the remote control signal. The drive module 103 is composed of three bridge arms, each bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube, which connects the phase coil of the three-phase micromotor 104. The control module 102 controls the switch tube of each bridge arm through the switch control signal, so that the three-phase micromotor 104 starts or stops. The switch tube of each bridge arm is controlled by the PWM control signal to adjust the speed of the three-phase micromotor 104. The start, stop and speed of the motor can be controlled by using the six-step commutation method, and 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, and each commutation state corresponds to a pair of turned-on MOS tubes, and the remaining MOS tubes remain closed. The three-phase micromotor 104 receives the signal of the drive module 103 and starts to operate and provides the corresponding wind speed.

[0118] The technical effect of the first embodiment is that through the switch signal and the wind speed adjustment control signal output by the input module, the control module can generate the switch control signal and the PWM control signal, and the user can adjust the running state and the wind speed of the fan according to the needs, realizing flexible wind speed adjustment. Compared with the traditional mechanical switch method, this technical solution enables the user to select the appropriate wind speed according to the specific needs, enhances the convenience and comfort of use, and improves the user experience.

[0119] As an implementation manner, as 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; the touch module 111 outputs a wind speed adjustment signal when detecting a sliding action, and the control module 102 calculates the duty cycle of the PWM signal according to the wind speed adjustment signal, and generates a PWM control signal according to the duty cycle of the PWM signal.

[0120] Among them, the touch module 111 detects the touch and sliding action of the user, 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 to generate a switch control signal for controlling the start or stop of the three-phase micro motor 104. The control module 102 receives and processes the wind speed adjustment signal to calculate the required duty cycle of the PWM signal according to the wind speed adjustment signal.

[0121] Among them, the control module 102 calculates the duty cycle of the PWM signal according to different calculation methods of the sliding parameter, which can include the following: sliding distance: the distance of the user's sliding finger on the touch area; sliding speed: the speed of the user's sliding finger; sliding direction: the direction of the user's sliding finger (such as up and down, left and right); sliding position: the start and end position of the user's sliding finger on the touch area.

[0122] Among them, the sliding distance is the main parameter, and the specific steps for calculating the duty cycle are as follows:

[0123] When the user starts to slide on the touch area, record the starting position, when the user ends to slide on the touch area, record the ending position, use the distance between the starting position and the ending position as the sliding distance. For example, set the starting position as P1 and the ending position as P2, the sliding distance D can be represented as: D=P2-P1, define the maximum distance Dmax that the user can 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, calculate the corresponding PWM signal duty cycle according to the corresponding relationship, output the PWM control signal according to the PWM signal duty cycle, send the generated PWM control signal to the driving module 103, adjust the rotating speed of the three-phase micro motor 104, and realize the change of the wind speed.

[0124] Among them, the sliding time is the main parameter, and the specific steps for calculating the duty cycle are as follows:

[0125] 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 adjusts the switching frequency and duty cycle of the switch tube to control the speed of the three-phase micro motor 104.

[0126] Among them, the specific steps of calculating the duty cycle with the click position as the main parameter are as follows:

[0127] When the user clicks on a certain position on the touch module 111, the touch module 111 detects the coordinates (such as X, Y coordinates) of the click position, and the touch module 111 generates a wind speed adjustment signal with the click position coordinates as the click parameter. According to the different click positions, the control module 102 calculates the required PWM signal duty cycle. For example, divide the touch area into multiple areas, each area corresponds to a different wind speed gear. Assuming that the touch area of the touch module 111 is divided into five equal areas, clicking each area corresponds to a wind speed gear: area 1 (leftmost) is low wind speed gear, area 2 (middle) is medium wind speed gear, and area 5 (rightmost) is high wind speed gear. The user clicks the rightmost side (area 5) of the touch area, and the touch module 111 detects the click position coordinates and generates the corresponding wind speed adjustment signal. The control module 102 receives the wind speed adjustment signal and calculates the required PWM signal duty cycle according to the click position (area 5) corresponding to the high wind speed gear. The control module 102 generates a PWM control signal and sends it to the drive module 103. The drive module 103 adjusts the speed of the three-phase micro motor 104 to the high wind speed gear by controlling the conduction time of the upper and lower bridge arm switch tubes.

[0128] As an embodiment, the touch module 111 can adopt a touch slide adjustment chip, which contains multiple contacts. When the user operates the fan through the touch screen, the touch slide adjustment chip detects the touch action through the contacts. If the pressure caused by the touch action is detected, the touch module 111 generates a switch signal. The touch slide 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 for controlling the switch tube in the drive module 103, so as to realize the start or stop of the three-phase micromotor 104, that is, the opening or closing of the fan. In addition to detecting the touch action, the touch slide adjustment chip can also detect the sliding parameters of the user on the touch screen, including the sliding gesture, sliding distance, sliding speed, sliding times and sliding time, etc. These parameters are transmitted to the control module 102 through the touch module 111, and the control module 102 generates a corresponding PWM control signal according to the preset logic, so as to adjust the wind speed of the portable fan. The control module 102 generates a corresponding PWM control signal according to the sliding parameters, and the PWM control signal is used to control the switch tube in the drive module 103, so as to adjust the rotating speed of the three-phase micromotor 104, thereby realizing the adjustment of the wind speed.

[0129] Among them, the touch slide adjustment chip has multiple contacts. When the user performs a touch slide operation on the contacts, the chip detects the touch action and the 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, which reflect the degree of the user's wish to adjust the wind speed. According to the detected sliding parameters, the touch slide adjustment chip generates a wind speed adjustment control signal. After receiving the wind speed adjustment control signal, the control module calculates the duty cycle of the corresponding PWM signal 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 rotating speed of the motor. By adjusting the duty cycle of the PWM signal, the rotating speed of the motor is accurately controlled, so as to adjust the wind speed of the fan.

[0130] As an example, as shown in Figure 4 The pins PA0 to PA4 of the touch chip U5 can be connected to the control module 102 through the above connection mode. The touch chip U5 includes at least the contacts K2, K3, K4, K5, K6 and K7. Each contact can detect a touch action. Different contacts can detect sliding parameters such as sliding gesture, sliding distance, sliding speed, sliding times and sliding time.

[0131] The technical effect of the embodiment is that, compared with the single mode of a mechanical switch controlling the gear of a conventional portable fan, a more diversified control mode is realized through the touch module. The user can not only turn on or off the fan by simple touch, but also flexibly adjust the wind speed by sliding operation. The application of the touch and 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 only needs to control the on-off and wind speed of the fan by touch and sliding, thereby improving the operation efficiency and use experience of the user. The control module generates a precise PWM control signal according to the detected sliding parameter, so as to realize accurate control of the fan wind speed. The user can flexibly adjust the wind speed according to the need, and obtain a more comfortable use experience.

[0132] As a second embodiment of the touch module 111, the touch module 111 can be a touch screen chip, including single-channel touch, multi-channel touch, touch screen, etc. The touch and sliding screen chip includes a switching area and a sliding area. The touch and sliding screen chip generates a switching touch signal through the switching area, and generates a corresponding wind speed adjustment control signal when detecting a sliding parameter through the sliding area.

[0133] Among them, the touch module 111 of the portable fan adopts a touch screen chip, which contains a switching area and a sliding area. When the user touches the switching area, the touch screen chip detects the touch action and generates a switching signal. When the user performs a sliding operation in the sliding area, the touch screen chip detects the sliding parameter and generates a corresponding wind speed adjustment control signal. The touch module 111 sends the generated switching signal and wind speed adjustment control signal to the control module 102. After receiving the switching signal, the control module 102 generates a switching control signal to control the switching tube of each bridge arm, so that the motor starts or stops running. After receiving the wind speed adjustment control signal, the control module 102 generates a PWM control signal to control at least one switching tube of each bridge arm to adjust the speed of the three-phase micro motor 104, thereby realizing wind speed adjustment.

[0134] As an example, as shown in Figure 5 The pins 5 to 9 of the touch screen connecting seat P2 are connected to the touch screen, and the pins 12 to 15 of the touch screen connecting seat P2 can be connected to the control module 102 through the above connection mode. As shown in Figure 6 The control interface is displayed on the screen of the mobile terminal, and the control interface includes a power-on button, a speed adjustment button, a timing-off button, an air purification button, an atmosphere lamp button, and a fan abnormality prompt. Different functions are realized by clicking the buttons. This is only an example and is not a limitation of the present application.

[0135] The technical effect of the embodiment is that the user can easily realize the on-off control and wind speed adjustment of the fan through the touch screen chip, the operation is simple and intuitive, the user's multiple needs are met, the touch screen chip can realize flexible on-off and wind speed adjustment through the detection of the on-off area and the sliding area, the user can accurately control the wind speed of the fan according to needs, and a more comfortable use experience is provided, the use of the touch screen improves the sense of technology and modernity of the portable fan, improves the user experience, and makes the product more competitive in the market.

[0136] As a third embodiment of the touch module 111, the touch module 111 includes a plurality of single-touch touch chips connected in parallel, generates an on-off touch signal when any one touch is detected, and generates a corresponding wind speed adjustment control signal when a plurality of touches are detected.

[0137] The touch module 111 of the portable fan includes a plurality of single-touch touch chips or a plurality of touch points integrated into one chip, when the user touches any one single-touch touch chip, the chip generates an on-off signal; when the user slides on the touch screen, a plurality of single-touch touch chips detect the sliding parameter and generate a corresponding wind speed adjustment control signal. The touch module 111 sends the generated on-off touch signal and wind speed adjustment control signal to the control module 102, and the control module 102 generates a conduction level signal after receiving the on-off touch signal, and controls the switch tube of each bridge arm through the signal, so that the motor starts or stops running. 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 speed of the three-phase micro motor 104, so as to realize wind speed adjustment.

[0138] As an example, as shown in Figure 7 The single-touch touch chip U3 is connected to the control module 102 through the pin 1 and the resistor R10, the pin 3 of the single-touch touch chip U3 is connected to a touch point K1 through the resistor R11, and the above functions can be realized by connecting a plurality of single-touch touch chips in parallel.

[0139] The technical effect of the embodiment is that the user can easily realize the on-off control and wind speed adjustment of the fan through the touch screen chip, the operation is simple and intuitive, the user's multiple needs are met, the touch sliding adjustment chip can realize flexible wind speed adjustment through the detection of a plurality of single-touch points, the user can accurately control the wind speed of the fan according to needs, and a more comfortable use experience is provided. The use of the touch screen improves the sense of technology and modernity of the portable fan, improves the user experience, and makes the product more competitive in the market.

[0140] As an embodiment, as shown in Figure 8As shown, when the input module 101 is the voice module 112, the voice module 112 captures the voice signal of the user 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, respectively.

[0141] As shown, the voice module 112 includes a voice acquisition module 121, a voice recognition module 122, and a voice output module 123, and the voice recognition module 122 is connected to the voice acquisition module 121, the voice output module 123, and the control module 102, respectively; the voice acquisition module 121 captures the voice signal of the user, the voice recognition module 122 converts the voice signal into a switch signal and a wind speed adjustment control signal and sends them to the control module 102, and the voice recognition module 122 also controls the voice output module 123 to output or not to output the execution result according to the feedback result of the control module 102.

[0142] As shown, the voice module 112 includes a voice acquisition module 121, a voice recognition module 122, and a voice output module 123, and the voice recognition module 122 is connected to the voice acquisition module 121, the voice output module 123, and the control module 102, respectively; the voice acquisition module 121 captures the voice signal of the user, the voice recognition module 122 converts the voice signal into a switch signal and a wind speed adjustment control signal and sends them to the control module 102, and the voice recognition module 122 also controls the voice output module 123 to output or not to output the execution result according to the feedback result of the control module 102.

[0143] As shown, the voice module 112 includes a voice acquisition module 121, a voice recognition module 122, and a voice output module 123, and the voice recognition module 122 is connected to the voice acquisition module 121, the voice output module 123, and the control module 102, respectively; the voice acquisition module 121 captures the voice signal of the user, the voice recognition module 122 converts the voice signal into a switch signal and a wind speed adjustment control signal and sends them to the control module 102, and the voice recognition module 122 also controls the voice output module 123 to output or not to output the execution result according to the feedback result of the control module 102. Figure 9

[0144] ​Among them, the voice acquisition module 121 is responsible for capturing the user's voice signal, usually composed of a microphone, for converting the user's voice input into an electrical signal form. The voice recognition module 122 converts the captured voice signal into a switching signal and a wind speed adjustment control signal, using voice recognition algorithms and technologies, and processes the voice signal into recognizable signal instructions, which can be parsed and executed by the subsequent control module 102. Specifically, the voice recognition module 122 pre-processes the captured voice signal, including signal amplification, filtering, and noise reduction, to ensure the accuracy and stability of subsequent processing. The pre-processed voice signal is converted into a digital feature vector, which can use techniques such as MFCC (Mel Frequency Cepstral Coefficients) to extract features from the voice signal. Based on a large amount of labeled voice data, a voice recognition model is trained. Common techniques include Hidden Markov Model (HMM), deep learning models such as Recurrent Neural Network RNN, Long Short-Term Memory Network LSTM, etc. The feature vector is input into the voice recognition model for recognition and decoding, and the model maps the feature vector sequence to the instruction sequence. The decoded instructions are output. The voice type can be to indicate the opening or closing of the fan, for example: turning on the fan corresponds to 0x01, turning off the fan corresponds to 0x02. The voice type can be to indicate the speed adjustment of the fan, for example: increasing the wind speed corresponds to 0x03, reducing the wind speed corresponds to 0x04. The voice type can be a specific wind speed level, directly setting the wind speed level. For example: low speed corresponds to 0x10, medium speed corresponds to 0x11, high speed corresponds to 0x12. In addition, other words can also 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 can be a single-byte or multi-byte data packet, depending on the complexity of the instructions and the design of the system. For example: a single-byte signal can be 0x01 (indicating turning on the fan), and a multi-byte signal can be 0x01 0x02 (indicating turning on the fan and setting to the second level of wind speed).

[0145] As an example, the user says "turn on the fan", the voice module 112 recognizes the instruction and generates signal 0x01, and the voice module 112 sends signal 0x01 to the control module 102. The user says "increase the wind speed", the voice module 112 recognizes the instruction and generates signal 0x03, and the voice module 112 sends signal 0x03 to the control module 102. The user says "set the wind speed to medium speed", the voice module 112 recognizes the instruction and generates signal 0x11, and the voice module 112 sends signal 0x11 to the control module 102.

[0146] As an example, as Figure 10 and Figure 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 connected to the second end of the resistor R24 and the second end of the capacitor R27, respectively. The second end of the microphone MIC is connected to the second end of the resistor R23 and the second end of the capacitor R28, respectively. The voice recognition module 122 includes a voice recognition chip U1. The pin 1 of the voice recognition chip U1 is connected to one end of the capacitor C21. The pin 2 of the voice recognition chip U1 is connected to one end of the capacitor C20 and one end of the resistor R20, respectively. The other end of the capacitor C20 is connected to the anode of the voltage stabilizing tube D1 and grounded. The other end of the resistor R20 is connected to the cathode of the voltage stabilizing tube D1 and connected to a high level. The pin 3 of the voice recognition chip U1 is connected to one end of the capacitor C24. The pin 4 of the voice recognition chip U1 is connected to one end of the capacitor C25. The pin 5 of the voice recognition chip U1 is connected to the other end of the capacitor C24 and the other end of the capacitor C25 and grounded. The pin 24 of the voice recognition chip U1 is connected to the same level as one end of the capacitor C22, one end of the capacitor C23, and the other end of the capacitor C21. The pin 23 of the voice recognition chip U1 is connected to the other end of the capacitor C22. The pin 22 of the voice recognition chip U1 is connected to the other end of the capacitor C23. The 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.

[0147] The working process of the circuit is as follows: the microphone MIC collects the voice input of the user. The capacitor C27 and the capacitor C28 convert the voice input of the user into an electrical signal and output it to the voice recognition chip U1. The voice recognition chip U1 converts the captured voice signal into a switching signal and a wind speed adjustment control signal.

[0148] The technical effect of the embodiment is that the user interaction and friendliness of the device are improved through voice input and output, so that the user can easily control the start, stop, and speed adjustment of the fan through voice instructions without directly contacting the device. Voice control enables the fan to have more functions, such as intelligent operation and customized voice settings according to user voice instructions, thereby enhancing the intelligent degree and user experience of the device.

[0149] As an embodiment, the voice output module 123 includes a power amplifier module 1131 and a loudspeaker 1132. Figure 12 As shown, the voice output module 123 includes a power amplifier module 1131 and a loudspeaker 1132. The power amplifier module 1131 is connected to the voice recognition module 122 and the loudspeaker 1132, respectively.

[0150] The power amplifier module 1131 is mainly responsible for amplifying the voice signal. The low-level voice signal output from the voice recognition module 122 is amplified to a high-level signal sufficient to drive the loudspeaker 1132. The loudspeaker 1132 receives the amplified voice signal from the power amplifier module 1131 and converts it into sound output.

[0151] As an example, as shown in Figure 13 The voice output module 123 includes a power amplifier chip U2 and a speaker 1132, the B1 and B2 ends of the power amplifier chip U2 are connected to the pins 16 and 17 of the voice recognition chip U1 respectively, and the power amplifier chip U2 is responsible for amplifying the voice signal and outputting the voice from the speaker 1132.

[0152] The technical effect of the embodiment is that through the power amplifier module 1131, the voice signal can be ensured not to be lost or distorted during transmission, and the speaker 1132 can be driven with sufficient volume, so that the user can clearly hear the voice output result.

[0153] As an example, as shown in Figure 14 The portable fan further includes a networking module 106 connected to the voice module 112 and the control module 102 respectively; the voice module 112 uploads the voice signal to the cloud server 107 through the networking module 106, the cloud server 107 converts the voice signal into a switch signal and a wind speed adjustment control signal and outputs them 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.

[0154] Among them, through the networking mode, the voice recognition service and remote control function of the cloud server 107 can be used to further improve the recognition accuracy and flexibility of the system. The specific steps are as follows: the microphone is used 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, the cloud server 107 converts the voice signal into a switch signal and a wind speed adjustment control signal, and returns them to the networking module 106. The networking module 106 sends the switch signal and the wind speed adjustment control signal returned by the cloud to the control module 102, and the control module 102 generates corresponding control signals. The control module 102 generates switch control signals according to voice instructions such as "turn on the fan" or "turn off the fan", or can also customize other switch instructions to increase the convenience and interest of use, for example, possible custom switch instructions: "open wind", "close wind", "start blowing", "I am hot, turn on the fan", etc. These instructions can be continuously expanded according to the user's use habits and preferences to improve the interactive experience. According to the voice instruction, the control module 102 calculates the corresponding PWM signal duty cycle and generates a PWM control signal according to the voice instruction such as "adjust high wind speed" or "adjust low wind speed". 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.

[0155] The technical effect of the embodiment is that, since the voice recognition is performed on the cloud server, the cloud server has stronger computing power and more efficient voice recognition algorithm, can more accurately recognize the voice instruction of the user, and improves the recognition accuracy; the voice recognition task is completed in the cloud, reducing the computing burden of the portable fan device, enabling the device to adopt a lower-cost hardware configuration, while prolonging the battery life; the addition of the networking module enables the portable fan to be linked with other smart devices, enabling remote control and data analysis, and further improving the user experience and the intelligent level of the device.

[0156] As an embodiment, as shown in Figure 15 The portable fan further includes a rotation speed measurement module 105 connected to the three-phase micromotor 104 and the control module 102. The rotation speed measurement module 105 is configured to measure the actual rotation speed of the three-phase micromotor 104 and send it to the control module 102. The control module 102 obtains the rotation speed variation based on the actual rotation speed and the target rotation speed, adjusts the duty cycle of the PWM signal based on the rotation speed variation, and outputs the adjusted PWM control signal to the driving module 103.

[0157] In the embodiment, an incremental PID control algorithm is used to generate the PWM signal to improve the smoothness of the PWM signal and the accuracy of the motor speed adjustment. The following steps can be used to achieve this: the incremental PID control algorithm adjusts the control amount by calculating the current and previous errors, thereby achieving accurate control of the system, including proportional (P), integral (I), and derivative (D) three parts: example control (P): proportional adjustment of the current error; integral control (I): cumulative adjustment of the past error; derivative control (D): rate adjustment of the current error. Initialize the PWM module and the timer, set the parameters required by the PID control algorithm (proportional coefficient Kp, integral coefficient Ki, and derivative coefficient Kd), obtain sensor data, the rotation speed measurement module 105 can be a magnetic encoder or a Hall sensor, and the rotation speed of the motor is measured in real time and fed back to the control module 102. The control module 102 calculates the current error based on the set target rotation speed and the actual measured rotation speed, calculates the incremental control amount based on the current error, adjusts the PWM duty cycle, outputs the PWM signal, and controls the rotation speed of the three-phase micromotor 104.

[0158] The technical effect of the embodiment is that the PID control algorithm adjusts the control amount based on the error, can accurately track the set value, and makes the motor speed quickly and stably around the target value. The PID control algorithm quickly responds to error changes, can adjust the PWM signal in time when the load changes, ensures the flexibility and accuracy of the wind speed adjustment, and accurately adjusts the PWM control signal through the PID control algorithm, so that the wind speed can be smoothly transitioned.

[0159] As an embodiment, the control module 102 detects the change in the operating voltage and maintains the operating voltage within a constant voltage range by boosting or bucking.

[0160] When the control module 102 detects the change in the operating voltage, the control module can adjust the operating voltage to a preset constant voltage range by a boost or buck circuit to maintain the stability of the motor operation. The control module 102 continuously monitors the input voltage and triggers the voltage adjustment mechanism when the voltage deviates from the preset range (e.g., 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 boost the voltage to 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 the set range. Through a feedback loop, the control module 102 can adjust the boost or buck degree in real time to ensure that the output voltage is constant within the preset range.

[0161] As an embodiment, the control module 102 detects the change in the operating current and maintains the operating current within a constant current range by adjusting the PWM control signal.

[0162] When the control module 102 detects the change in the operating current, the control module maintains the current within a constant range by adjusting the PWM (Pulse Width Modulation) control signal. The control module 102 continuously monitors the operating current of the motor. When the current deviates from the preset range (e.g., 0.12-1A), the current adjustment 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 the current is detected to be lower than the preset range, the PWM duty cycle is increased to increase the input power and increase the current. Conversely, when the current is higher than the preset range, the PWM duty cycle is reduced to reduce the input power and reduce the current. Through current sensor feedback, the control module 102 adjusts the PWM signal duty cycle in real time to ensure that the operating current remains within a constant range.

[0163] As an embodiment, the control module 102 detects the change in the operating power and maintains the operating power stable by adjusting the operating voltage or the operating current.

[0164] The control module 102 continuously monitors the working power (P = V x I) of the motor, and triggers the power adjustment mechanism when the detected 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 to increase the current and increase the power; when the power is higher than the set value, the PWM duty cycle is reduced to reduce the current and reduce the power. Through the control of the 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.

[0165] In the above embodiments, the control module monitors the working voltage, current and power of the motor in real time, and through the corresponding adjustment mechanism, ensures that the motor can operate stably under various working conditions, improves the efficiency and performance of the motor, and guarantees the reliability and stability of the portable fan in different environments.

[0166] For the driving module 103, as an embodiment, as shown in Figure 16 and Figure 17 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 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.

[0167] The first bridge arm comprises a first upper bridge arm switch tube 301 and a second lower bridge arm switch tube 302, and a first coil 311 is connected at the midpoint of the first bridge arm. The second bridge arm comprises a third upper bridge arm switch tube 303 and a fourth lower bridge arm switch tube 304, and a second coil 312 is connected at the midpoint of the second bridge arm. The third bridge arm comprises a fifth upper bridge arm switch tube 305 and a sixth lower bridge arm switch tube 306, and a third coil 313 is connected at the midpoint of the third bridge arm. Six loops are formed, each of which is composed of a switch tube and a coil. The control module 102 controls each loop to be turned on one by one by a switching control signal to drive the motor to start running. The control module 102 generates a switching control signal according to the received switching signal, which is used to control the switch tubes in each loop one by one. Specifically, the switch tubes in each bridge arm are opened one by one according to the control of the switching control signal, so as to drive the phase coil of each motor by current. With the step-by-step conduction of the switch tubes in each bridge arm, current flows through the respective phase coils, and the motor starts to rotate. Step-by-step conduction of the six loops means that each motor phase in the fan is started in sequence, thereby starting the entire fan system. Specifically, the switch tubes in each loop of the six loops are opened in turn to make each loop conductive, and the first loop to the sixth loop is sequentially conductive, so that the fan rotates forward. The sixth loop to the first loop is sequentially conductive, so that the fan rotates reversely.

[0168] After the control module 102 receives the wind speed adjustment control signal, a PWM control signal is generated. For each loop, the PWM control signal is used to adjust the corresponding switch tube, thereby adjusting the rotating speed of the motor.

[0169] As an embodiment, the control module also controls the conduction time of the switch tube in each loop by the PWM control signal to adjust the rotating speed of the motor.

[0170] The control module receives the wind speed adjustment control signals from the touch module or the voice module, which contain the user's adjustment instructions for the fan speed. The control module 102 generates corresponding pulse width modulation (PWM) control signals according to the wind speed adjustment control signals. 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 switching tubes in each loop. Specifically, the switching tubes in each loop are switched according to the duty cycle of the PWM signal. When the high level is on, the switching tube is turned on; when the low level is on, the switching tube is turned off. By adjusting the duty cycle of the PWM signal, the on time of the switching tube in each loop is controlled, thereby adjusting the current flowing through the motor coil. The speed of the motor is directly proportional to the current intensity in the motor coil. By adjusting the on time of the switching tube in each loop, the control module 102 can accurately control the current of the three-phase micro motor 104, thereby adjusting the speed of the three-phase micro motor 104. By gradually increasing or decreasing the duty cycle of the PWM signal, the speed of the fan can be accelerated or decelerated, achieving the adjustment of the fan speed.

[0171] The technical effect of the embodiment is that the control module generates corresponding PWM control signals according to the received wind speed adjustment control signals. The duty cycle of the PWM signal directly determines the on time of the switching tube in each loop, thereby controlling the current of the motor coil. Therefore, by adjusting the duty cycle of the PWM signal, the speed of the motor can be accurately adjusted.

[0172] As an embodiment, the portable fan further includes an energy feedback circuit connected to the control module, the motor, and the energy storage unit. When the control module detects a decrease in the PWM duty cycle, it controls the energy feedback circuit to start working. The back electromotive force generated when the motor decelerates is converted into electrical energy by 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, the kinetic energy of the motor is converted into electrical energy by the rectifier circuit, and stored in the super capacitor or battery.

[0173] As an example, the portable fan is running at high speed. At this time, the user reduces the fan speed or stops the fan through the input module. The control module detects the wind speed adjustment signal or the switch signal, reduces the duty cycle of the PWM signal, and makes the motor decelerate. 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 by the rectifier circuit, and the converted electrical energy is stored in the super capacitor or battery. When the fan is started 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 supply.

[0174] The technical effect of the embodiment is that through energy recovery, kinetic energy can be converted into electrical energy storage when the fan is decelerated or stopped, reducing energy waste; reducing dependence on external power supply, prolonging the use time of the battery, and improving the endurance of the portable fan; users can enjoy more stable and persistent wind speed adjustment during use, improving the overall user experience.

[0175] As an embodiment, 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 and the touch module 111 output switch signals and wind speed adjustment control signals according to user instructions, respectively. The control module 102 generates switch control signals and PWM control signals according to the switch signals and the wind speed adjustment control signals, respectively.

[0176] The technical effect of the embodiment 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, increasing the intelligence of the product.

[0177] As an embodiment, 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 switch signals. The touch module 111 outputs wind speed adjustment control signals. The control module 102 generates switch control signals and PWM control signals according to the switch signals and the wind speed adjustment control signals, respectively.

[0178] Among them, the user issues a command to turn on or off the touch module to the voice module 112 through a voice instruction, and the voice module 112 transmits these instructions to the control module 102. The user issues a command to the voice module 112 through a voice instruction, and the voice module 112 generates a switch signal according to the user's instruction and transmits it to the control module 102. When the touch module 111 is enabled, the user inputs a wind speed adjustment command 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 transmits it to the control module 102. The control module 102 enables or disables the touch module 111 according to the instructions of the voice module 112. When the touch module 111 is disabled, all touch operations will not generate wind speed adjustment control signals, 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.

[0179] The technical advantages of this implementation are as follows: The touch module can be enabled or disabled via voice commands. When holding the fan, users can disable the touch module by voice, avoiding accidental adjustments to the fan speed due to unintentional touches, thus improving the user experience and product safety. The switch signal generated by the voice module is processed by the control module, ensuring accurate fan on / off operation. When the touch module is enabled, it generates a fan speed adjustment control signal based on the user's touch operation. The control module then generates a high-precision PWM control signal based on this signal, achieving precise adjustment of the fan speed and meeting the user's personalized needs.

[0180] As an example, such as Figure 18 The diagram shown is a circuit diagram of the drive module 103, which includes a first drive submodule, a second drive submodule, and a third drive submodule.

[0181] The first driving submodule includes MOSFETs Q1, Q2, and Q7, capacitors C16, C21, and C27, and resistors R20, R24, R25, and R26. The first terminals of capacitors C16, R24, Q7, Q2, C21, and C27 are all connected to the power supply. The second terminal of capacitor C16 is connected to the second terminal of resistor R24, the drain of MOSFET Q1, and the gate of MOSFET Q2. The gate of transistor Q1 is connected to the first terminal of resistor R20 and the first control signal terminal U_H, respectively. The source of transistor Q1 is connected to the second terminal of resistor R20. The drain of transistor Q2 is connected to the drain of transistor Q7 and the first terminal of the first coil, respectively. The gate of transistor Q7 is connected to the first terminal of resistor R25 and the second control signal terminal U_L, respectively. The source of transistor Q7 is connected to the second terminal of resistor R25 and the first terminal of resistor R26, respectively. The second terminals of capacitors C21 and C27 are connected to ground.

[0182] The second driving submodule comprises MOS tube Q3, MOS tube Q4, MOS tube Q8, capacitor C26, capacitor C25, resistor R32, resistor R34, resistor R35 and resistor R38, the first end of capacitor C26, the first end of resistor R34, the source of MOS tube Q4 and the first end of capacitor C25 are connected in common and connected to the power supply, the second end of capacitor C26 is connected to the second end of resistor R34, the drain of MOS tube Q3 and the gate of MOS tube Q4 respectively, the gate of MOS tube Q3 is connected to the first end of resistor R32 and the third control signal end V_H, the source of MOS tube Q3 is connected to the second end of resistor R32 in common, the drain of MOS tube Q4 is connected to the drain of MOS tube Q8 and the first end of the second coil respectively, the gate of MOS tube Q8 is connected to the first end of resistor R35 and the fourth control signal end V_L respectively, the source of MOS tube Q8 is connected to the second end of resistor R35 and the first end of resistor R38 respectively, and the second end of capacitor C25 is connected to the ground.

[0183] The third driving submodule comprises MOS tube Q5, MOS tube Q6, MOS tube Q9, capacitor C32, capacitor C35, resistor R42, resistor R46, resistor R49 and resistor R51, the first end of capacitor C32, the first end of resistor R46, the source of MOS tube Q6 and the first end of capacitor C35 are connected in common and connected to the power supply, the second end of capacitor C32 is connected to the second end of resistor R46, the drain of MOS tube Q5 and the gate of MOS tube Q6 respectively, the gate of MOS tube Q5 is connected to the first end of resistor R42 and the fifth control signal end W_H, the source of MOS tube Q5 is connected to the second end of resistor R42 in common, the drain of MOS tube Q6 is connected to the drain of MOS tube Q9 and the first end of the third coil respectively, the gate of MOS tube Q9 is connected to the first end of resistor R49 and the sixth control signal end W_L respectively, the source of MOS tube Q9 is connected to the second end of resistor R49 and the first end of resistor R51 respectively, the second end of capacitor C25 is connected to the ground, the second end of resistor R26, the second end of resistor R38 and the second end of resistor R51 are connected to the ground in common.

[0184] Among them, the power supply, MOS tube Q2, the first coil, the second coil, MOS tube Q8 and resistor R38 form the first loop; the power supply, MOS tube Q2, the first coil, the third coil, MOS tube Q9 and resistor R51 form the second loop; the power supply, MOS tube Q4, the second coil, the third coil, MOS tube Q9 and resistor R51 form the third loop; the power supply, MOS tube Q4, the second coil, the first coil, MOS tube Q7 and resistor R26 form the fourth loop; the power supply, MOS tube Q6, the third coil, the first coil, MOS tube Q7 and resistor R26 form the fifth loop; the fifth upper bridge arm switch tube, the third coil, the second coil, MOS tube Q8 and resistor R38 form the sixth loop.

[0185] Wherein, MOS tube Q2, MOS tube Q4, MOS tube Q6 can adopt NMOS tube or PMOS tube, the half-bridge driving mode of MOS tube Q2, MOS tube Q4, MOS tube Q6 can adopt the driving mode of the circuit diagram of China, in addition, other driving modes can also be adopted, for example, capacitor energy storage driving, transformer coupling driving, optical coupling driving, etc.

[0186] The control module 102 inputs switch control signals to the two switch tubes in each loop through the first control signal end to the sixth control signal end, and controls the first loop to the sixth loop to be turned on one by one in a preset order to drive the motor to start running through the switch control signals. The control module 102 inputs PWM control signals to the two switch tubes in each loop through the first control signal end to the sixth control signal end, and controls the conduction current of each loop to adjust the speed of the motor through the duty ratio of the PWM control signal.

[0187] As an embodiment, as shown in the figure, Figure 19 In the 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 tube can significantly reduce the occupied space on the circuit board, so that the driving circuit is more compact, and the use of integrated switch tube module simplifies the circuit design and layout, reduces the wiring complexity.

[0188] As an embodiment, as shown in the figure, Figure 20 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 connected with the control module 102 respectively, and the portable fan further includes an atomization module 203, a refrigeration module 204, a heating module 205, an illumination module 206 and a shaking head module 207 connected with the control module 102 respectively.

[0189] Wherein, the manual switch module 201 can be a key switch or an encoder, the touch module 111 can be a touch key, a sliding resistor, a touch sliding module or a touch screen module, and the wireless module 202 can be a mobile control module, a Bluetooth control module and a wireless control module;

[0190] The key switch can realize manual control of the fan. By pressing the button, the fan can be turned on or off, i.e., the speed is adjusted. The encoder is used to adjust the wind speed. By rotating the encoder, the fan speed setting can be changed. The touch key controls the fan switch and wind speed adjustment through touch sensing. The sliding resistor can adjust the wind speed by sliding to adjust the resistance value, providing continuous wind speed adjustment. The touch slide module adjusts the wind speed through a sliding gesture, detecting sliding parameters such as speed, direction, and position to control the wind speed. The touch screen module provides a graphical interface, allowing control of various functions such as switching, wind speed adjustment, and timing settings through the touch screen. The voice control module can control the fan's on / off and wind speed adjustment through voice commands, improving the intelligent control experience. The networked voice control module can implement remote voice control by uploading voice commands to a cloud server for processing through an internet connection. The networking module can implement remote control functions through the internet, allowing remote control of the fan's functions through a mobile phone or other device. The mobile control module can control the fan's functions, including switching, wind speed adjustment, and timing, through a mobile device such as a mobile phone or tablet. The Bluetooth control module can connect to a mobile device through Bluetooth, enabling close-range wireless control of the fan. The wireless control module can enable remote control and management of the fan through wireless signals such as Wi-Fi. The atomization module 203 can provide humidification by atomizing water to make the fan's wind cooler and more humid. The cooling module 204 can provide cooling by reducing the temperature of the outgoing air through internal cooling elements, improving cooling efficiency. The heating module 205 can provide heating by warming the fan's wind through internal heating elements, suitable for cold seasons. The lighting module 206 can provide lighting by integrating LED lights or other light sources, providing night lighting or decorative lighting effects. The head-shaking module 207 can provide automatic head-shaking, allowing the fan to swing left and right, increasing the coverage of the wind and improving comfort.

[0191] The technical effect of the embodiment is that the portable fan not only provides diversified control methods and intelligent functions, but also significantly improves user comfort and operational convenience, meeting various needs in different use scenarios.

[0192] It should be noted that all input, output, and control functions in the portable fan can be integrated into a single chip or integrated circuit, which can simplify system design and manufacturing processes, reduce component count and space occupation, and possibly reduce cost and power consumption.

[0193] The portable fan based on three-phase micro motor provided by the embodiment one includes at least a handheld fan for handheld use, a desktop fan for portable and desktop use, or a neck-hanging fan for neck-hanging use. The structure of the portable fan includes but is not limited to the following embodiments.

[0194] As an embodiment, the embodiment provides a portable fan based on three-phase micro motor, which can be used as a handheld fan for handheld use, as shown in Figure 21 The portable fan includes:

[0195] The left handle shell 81, the right handle shell 82, the air outlet front shell 83, the middle shell 84, the air outlet 85, the key 86, the wavy switch key 87, the hanging line slot 88, the shock absorbing silica gel 89, the shock absorbing silica gel 90, the air inlet net 91, the light shielding bubble cotton 92, the battery bubble cotton 93, the silica gel gasket 94, the motor assembly 95, the screw 96, the screw 97, the battery 98, and the PCB 99.

[0196] As an embodiment, the embodiment provides a portable fan based on three-phase micro motor, which can be used as another handheld fan for handheld use, as shown in Figure 22 The portable fan includes:

[0197] The front shell decoration 401, the flat connecting plate assembly 402, the ball bearing 403, the front shell 404, the air duct 405, the middle shell 406, the fan motor 407, the spring 408, the fan blade 409, the screw 410, the rear shell 411, the rear shell decoration 412, the screw cover 413, the screw 414, the roller assembly 415, the key decoration 416, the safety supervision office fixing support 417, the roller switch small plate 418, the screw 419, the wavy switch small plate 420, the mainboard fixing support 421, the wavy switch 422, the handle support 423, the battery pack 424, the handle 425, the handle decoration 426, the hanging rope support 427, the screw 428, and the snap ring 429.

[0198] As an embodiment, the embodiment provides a portable fan based on three-phase micro motor, which can be used as a desktop fan for portable and desktop use, as shown in Figures 23 to 25 The portable fan includes:

[0199] Screen shell 1, screen front shell 2, character light-transmitting patch 3, screen light-transmitting support 4, digital screen PCB 5, self-tapping screw 6, screen back shell 7, screw 8, shock-absorbing silica gel ring 9, shock-absorbing EVA 10, fan motor support 11, motor 12, snap ring 13, gasket 14, fan bearing 15, mainboard, digital screen PCB connecting wire 16, fan spring 17, magnetic ring assembly 18, fan blade 19, fan blade shell 20, light guide ring 21, lamp strip 22, fan head support 23, lower screw hole cover 24, upper screw hole cover 25, air duct piece 26, shell 27, filter core two-end compressed foam 28, air filter core 29, filter core support 30, back cover 31, copper nut 32, countersunk screw 33, shell wire snap ring 34, wire pressing cover 35, base wire snap ring 36, rotating shaft 37, air duct wire cover 38, left rotating shaft plug 39, right rotating shaft plug 40, wire shielding cover 41, aluminum alloy support 42, screw 43, base upper shell 44, self-tapping screw 45, stepper motor 46, stepper motor support 47, steel ball 48, steel ball support 49, lower steel ball support 50, large gear 51, small gear 52, clutch gear 53, stepper motor bearing 54, battery EVA 55, spring 56, buckle 57, round key 58, round key silica gel 59, light key silica gel 60, light key 61, knob 62, key plate 63, self-tapping screw 64, charging plate 65, charging plate support 66, base lower shell 67, battery pack 68, battery EVA 69, base bottom shell 70, label 71, and foot pad 72.

[0200] As an implementation, the embodiment provides a portable fan based on a three-phase micro motor, which can be used as a neck fan, as shown in Figure 26 The portable fan includes:

[0201] Neck support 501, air inlet 502, air outlet 503, and clamping arm 504.

[0202] Example Two

[0203] The embodiment provides a control method based on the portable fan provided by the embodiment, as shown in Figure 27 The control method includes:

[0204] Step S101. Control the working voltage of the three-phase micro motor to be 2 to 18 volts, control the working current of the three-phase micro motor to be 0.1 to 10 amperes, and / or control the rated working power of the three-phase micro motor to be 0.5 to 100 watts.

[0205] Step S102. According to the working voltage, the working current, and / or the rated working power, control the rated working rotating speed of the three-phase micro motor through the driving module to reduce the high rotating speed noise of the three-phase micro motor and control the wind speed to be within a preset wind speed interval.

[0206] The control method further comprises:

[0207] Step S111. Obtain a wind speed adjustment control signal.

[0208] Step S112. Convert the wind speed adjustment control signal into a PWM control signal.

[0209] Step S113. Control the switch tube of each bridge arm through the PWM control signal to adjust the rotating speed of the motor.

[0210] The control method further comprises:

[0211] Step S201. Obtain a switch signal.

[0212] Step S202. Convert the switch signal into a switch control signal.

[0213] Step S203. Control the switch tube of each bridge arm through the switch control signal to drive the motor to start or stop running.

[0214] Wherein, the switch signal and the wind speed adjustment control signal are control signals generated according to user instructions, and the touch signal and the adjustment signal generated by the user through touch or other ways can be directly converted into switch control and PWM control signals. The switch signal can be the switch operation of the user, such as the command to turn on or off the fan; the wind speed adjustment control signal is used to adjust the rotating speed of the fan, which is usually generated by manual operation or other control methods of the user.

[0215] Wherein, the switch signal is processed and converted into a switch control signal that can control the switch tube of the bridge arm, which is used to start or stop the operation of the motor. The wind speed adjustment control signal is processed and the duty cycle of the corresponding PWM (pulse width modulation) control signal is calculated, and the PWM control signal is used to adjust the rotating speed of the motor by adjusting the conduction time of the switch tube of each bridge arm.

[0216] Wherein, according to the switch control signal, the driving module will turn on or off the switch tube of each bridge arm accordingly, so as to start or stop the operation of the motor. At the same time, according to the calculated PWM control signal, the driving module adjusts the working period and duty cycle of the switch tube of each bridge arm to control the rotating speed and power output of the motor.

[0217] As an embodiment, when the input module is a touch module, converting the wind speed adjustment control signal into a PWM control signal comprises:

[0218] According to the wind speed adjustment control signal, the duty cycle of the PWM signal is calculated, and the PWM control signal is generated according to the duty cycle of the PWM signal.

[0219] As an implementation, when the input module is a voice module, the voice module captures the voice signal of the user and converts the voice signal into a switch signal and a wind speed adjustment control signal.

[0220] The above two implementations can be specifically seen from Example One, which will not be described here again.

[0221] Example Three

[0222] Please refer to Figure 28 An embodiment of the present application provides a portable fan based on a three-phase micro motor, which comprises a shell 1 (see Figures 23 to 25 and a power supply circuit 01, a controller 02, a drive bridge circuit 03, a three-phase micro motor 04 and fan blades 19 (see Figures 23 to 25 connected with the fan blades 19.

[0223] The power supply circuit 01 comprises a rechargeable battery, and is connected with a power supply end of the controller 02 and a power supply bus V+ / V- of the drive bridge circuit 03. A control pin of the controller 02 is used to be connected with a controlled end of the drive bridge circuit 03. Three output ends of the drive bridge circuit 03 are connected with three electrodes U / V / W of the three-phase micro motor 04. The controller 02 is used to output a control signal to control the drive bridge circuit 03 to generate a three-phase alternating current of a sine wave to drive the three-phase micro motor 04 to start, stop or change speed.

[0224] The rechargeable battery is 1, 2 to 6 sections, and provides a power supply voltage output of 2 to 18 volts. Typically, the rechargeable battery is a 1-section, 2-section or 3-section battery in series output, parallel output or series-parallel output, wherein the output voltage of the 1-section rechargeable battery is 3 volts to 4.2 volts. The control signal is generally a PWM signal. The controller 02 is, for example, a single-chip microcomputer.

[0225] In the embodiment, the portable fan is powered by a low-voltage rechargeable battery, and the conventional drive chip of the drive bridge circuit 03 is omitted, thereby saving the cost and directly using the controller 02 to control / drive the drive bridge circuit 03 to generate a three-phase alternating current to drive the three-phase micro motor 04 to achieve the aforementioned high-speed and wide-range speed regulation. On the other hand, the three-phase micro motor 04 is driven by a three-phase current of a sine wave, and compared with a three-phase current of a square wave, the driving current is smoother, the noise and power consumption of the three-phase micro motor 04 are greatly reduced, the endurance is improved, a high-efficiency, low-noise, adjustable wind speed, long-endurance portable fan solution is provided, and the user experience is improved.

[0226] For example, compared with a portable fan of the same size on the market, the portable fan provided by the embodiment can improve the endurance by about 30% and reduce the noise by about 30% under similar power supply.

[0227] 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 power bus V+ and the negative power bus V-, three series nodes of the three drive bridge arms constitute three outputs of the drive bridge circuit 03, and the three electrodes U / V / W of the three-phase micro motor 04 are connected respectively, the control ends of the three upper bridge arms and the control ends of the three lower bridge arms are used for connecting to six control pins of the controller 02.

[0228] Referring to Figure 29 , the three upper bridge arms include a first upper bridge arm 031, a second upper bridge arm 033, and a third upper bridge arm 035, and the three lower bridge arms include a first lower bridge arm 032, a second lower bridge arm 034, and a third lower bridge arm 036. The series node A of the first upper bridge arm 031 and the first lower bridge arm 032, the series node B of the second upper bridge arm 033 and the second lower bridge arm 034, and the series node C of the third upper bridge arm 035 and the third lower bridge arm 036 are connected to the three electrodes U / V / W of the three-phase micro motor 04 in turn.

[0229] 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 power bus V+ and the negative power bus V-, one series node of the first switch tube and the second switch tube constitutes one output of the drive bridge circuit 03, the control end of one first switch tube is used for connecting to one control pin of the controller 02, and the control end of one second switch tube is used for connecting to one control pin of the controller 02.

[0230] Referring to Figure 30 , the first lower bridge arm 032 includes a switch tube Q11, the first lower bridge arm 032 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 tube Q11, the switch tube Q12, the switch tube Q13, the switch tube Q14, the switch tube Q15, and the switch tube 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.

[0231] For example, the drive bridge circuit 03 of the embodiment is suitable for low input voltage, for example, the power supply circuit 01 uses one, two or more rechargeable batteries in parallel, and the output voltage is 3 volts to 4.2 volts.

[0232] In some embodiments, each upper bridge arm further comprises 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.

[0233] Referring to Figure 31 , the first lower bridge arm 032 further comprises a switch tube Q17, the second upper bridge arm 033 further comprises a switch tube Q18, and the third upper bridge arm 035 further comprises a switch tube Q19. The switch tube Q17, the switch tube Q18, and the switch tube Q19 are connected to the control pins U_H, V_H, and V_H of the controller 02, respectively.

[0234] In some embodiments, the switch tube is, for example, an NMOS tube or a PMOS tube, or an IGBT tube.

[0235] For example, the drive bridge circuit 03 of the present embodiment is adapted to access a working voltage of 6 volts or above. Figure 30 The output voltage of the power supply circuit 01 is 6 volts or above, which is higher than the output voltage of the conventional drive bridge circuit. The power supply circuit 01 uses two or more groups of rechargeable batteries in series to output, and the output voltage is 6 volts or above. Each group of rechargeable batteries comprises one or more parallel rechargeable batteries. For example, two groups of rechargeable batteries are used in series to output, and the output voltage is 6 volts to 8.4 volts.

[0236] In some embodiments, the portable fan further comprises a three-phase micro motor fan module, which comprises the drive bridge circuit 03, the three-phase micro motor 04, and the fan blades 19. The drive bridge circuit 03, the three-phase micro motor 04, and the fan blades 19 can constitute part or all of the three-phase micro motor fan module, so as to modularize the three-phase micro motor fan module, which can be used as an independent whole component / product.

[0237] Referring to Figure 32 , in some embodiments, the portable fan further comprises an input module 05 and a detection circuit 06.

[0238] 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 the operation of a user. The detection circuit 06 is connected to the controller 02, the drive bridge circuit 03, and the three-phase micro motor 04, and is used to detect the working electrical parameters of the drive bridge circuit 03 and the three-phase micro motor 04. The controller 02 is further used to modulate the control signal according to the input signal and the working electrical parameters to adjust the three-phase alternating current, so as to realize the speed adjustment, start, or stop of the three-phase micro motor 04.

[0239] The input module 05 can generate start signal, shutdown signal, speed regulation signal and other input signals according to user operation. The controller 02 controls the high-speed three-phase electrode 04 to start at a preset rotating speed according to the start signal, controls the high-speed three-phase electrode 04 to stop according to the shutdown signal, and adjusts the rotating speed of the three-phase micro motor 04 according to the speed regulation signal and the working electrical parameter 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 micro motor 04, and the counter electromotive force voltage of the three-phase micro motor 04.

[0240] Referring to Figure 33 In some embodiments, the detection circuit 06 includes a voltage detection circuit 061, a current detection circuit 062, and a counter electromotive force detection circuit 063.

[0241] The voltage detection circuit 061 is connected with the positive pole V+ of the power supply bus, used for detecting the power supply voltage (such as the output voltage of the rechargeable battery) of the power supply circuit 01 and outputting a voltage detection signal; the current detection circuit 062 is connected with the negative pole V- of the power supply bus, used for detecting the working current of the three-phase micro motor 04 and outputting a current detection signal; and the counter electromotive force detection circuit 063 is connected with the three output terminals of the drive bridge circuit 03, used for detecting the counter electromotive force of the three-phase micro motor 04 and outputting.

[0242] In some embodiments, the detection circuit 06 further includes an overcurrent protection circuit 064 connected with the negative pole V- of the power supply bus, used for outputting an overcurrent trigger signal in the case that the working current of the three-phase micro motor 04 reaches an overcurrent threshold value; and the controller 02 is further used for controlling the drive bridge circuit 03 to turn off the output of three-phase electricity according to the overcurrent trigger signal.

[0243] Referring to Figure 30 In some embodiments, the current detection circuit 062 includes a first sampling resistor Rs, a capacitor C0 and a resistor R0. The total working current of the three-phase micro motor 04, that is, the total driving current IR_SUM of the drive bridge circuit 03, is directly output to the controller 02 after being filtered by the filter circuit composed of the capacitor C0 and the resistor R0.

[0244] The current sampling mode of the current detection circuit 062 of the embodiment is suitable for driving the three-phase micro motor 04 by the three-phase alternating current of the output square wave, that is, controlling the three-phase micro motor 04 in the six-step commutation mode.

[0245] Referring to Figure 31 , Figure 33 and Figure 34 In some embodiments, the current detection circuit 062 includes a first sampling resistor Rs and a first differential amplification circuit 0621.

[0246] The first sampling resistor Rs is connected in series between the power supply circuit 01 and the power bus negative pole V- of the drive bridge circuit 03. The first differential amplification circuit 0621 is connected between the two ends of the first sampling resistor. The positive input end and the negative output end of the first differential amplification circuit 0621 are connected to the output end of the controller 02.

[0247] In this embodiment, the current detection circuit 062 detects the total working current of the three-phase micromotor 04, i.e., the total driving current IR_SUM of the drive bridge circuit 03. After being processed by the first differential amplification circuit 0621, the output current detection signal I_SUM_AVG is output to the controller 02.

[0248] The current sampling mode of the current detection circuit 062 in this embodiment is suitable for driving the three-phase micromotor 04 by the three-phase alternating current with a sine wave or a square wave. Specifically, the three-phase micromotor 04 is controlled in the mode of magnetic field vector control (FOC). Specifically, the current detection signal I_SUM_AVG needs to be converted into the three-phase current of the three-phase micromotor 04 before FOC control.

[0249] Please refer to Figure 31 , Figure 33 and Figure 35 In some embodiments, the current detection circuit 062 includes two second sampling resistors R26 / R38 and two second differential amplification circuits 0622 / 0623, which include a first second differential amplification circuit 0622 and a second second differential amplification circuit 0623.

[0250] The two second sampling resistors R26 / R38 are connected in series at one end of the power bus negative pole V- connected to any two drive bridge arms of the drive bridge circuit 03. The two second differential amplification circuits 0622 / 0623 are connected to the two second sampling resistors R26 / R38. The output ends of the two second differential amplification circuits 0622 / 0623 are connected to the controller 02. The positive input end and the negative output end of each second differential amplification circuit 0622 / 0623 are connected to the two ends of the corresponding second sampling resistor R26 / R38. The positive input end and the negative output end of the first second differential amplification circuit 0622 are connected to the two ends of the first second sampling resistor R26. The positive input end and the negative output end of the second second differential amplification circuit 0623 are connected to the two ends of the first second sampling resistor R26.

[0251] It should be noted that Figure 35The current detection circuit 062 is connected to the drive bridge arms of the U phase and the V phase of the drive bridge circuit 03, and in other examples, the current detection circuit 062 is connected to the drive bridge arms of the U phase and the W phase of the drive bridge circuit 03, or the drive bridge arms of the V phase and the W phase.

[0252] In this embodiment, the current detection circuit 062 directly detects the drive current of two phases of the drive bridge circuit 03, that is, the operating current of two phases of the three-phase micromotor 04, and the output current detection signals OP10 / OP20 of the two second differential amplification circuits 0622 / 0623 are output to the controller 02.

[0253] The current sampling mode of the current detection circuit 062 of this embodiment calculates the current detection signal of the third phase according to the current detection signals OP10 / OP20, and combines the three-phase current to perform FOC control on the three-phase micromotor 04.

[0254] Please refer to Figure 31 , Figure 33 and Figure 35 In some embodiments, three second sampling resistors R26 / R38 / R51 and three second differential amplification circuits are provided. Among them, the three second differential amplification circuits are the same structure, taking the differential amplification circuit 0622 as an example.

[0255] The three second sampling resistors R26 / R38 / R51 are respectively connected in series at one end of the negative power bus V- connected to the three drive bridge arms of the drive bridge circuit 03; the three second differential amplification circuits 0622 are respectively connected with the three second sampling resistors R26 / R38 / R51, and the output ends of the three second differential amplification circuits 0622 are connected to the controller 02;

[0256] Among them, the positive input end and the negative output end of each second differential amplification circuit 0622 are respectively connected to the two ends of the corresponding second sampling resistor R26 / R38 / R51.

[0257] The current sampling mode of the current detection circuit 062 of this embodiment performs FOC control on the three-phase micromotor 04 according to the three current detection signals output by the three second differential amplification circuits 0622.

[0258] In some embodiments, the back electromotive force detection circuit 063 comprises three back electromotive force detection sub-circuits, each of which comprises 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 a corresponding electrode U / VW of the three-phase micromotor 04 and a ground end (i.e. the positive bus V-), the second voltage divider R21 is connected in parallel with the filter C02, and the series node of the first voltage divider R20 and the second voltage divider R21 of each back electromotive force detection sub-circuit is further 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 pin BEMF_U / BEMF_V / BEMF_W respectively represents 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 sub-circuits.

[0259] For example, the first voltage divider R20 and the second voltage divider R21 each comprise a resistor, and the filter C12 comprises a capacitor.

[0260] In some embodiments, the input module 05 comprises at least one of a button input unit, a touch input unit and a voice input unit. For example, the button input unit is the manual switch module 201 described above, the touch input unit is the touch module 111 described above, and the voice input unit is the voice module 112 described above.

[0261] In some embodiments, the power supply circuit 01 further comprises a power supply circuit, the positive electrode of the rechargeable battery is connected to the positive bus V+ of the drive bridge circuit 03 and the positive electrode of the power supply circuit, the negative electrode of the rechargeable battery is connected to the negative bus V- of the drive bridge circuit 03 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.

[0262] For example, the power supply circuit is a circuit based on an LDO (low dropout regulator), which outputs a power supply voltage VDD (reference Figure 34 、 Figure 35 ).

[0263] In some embodiments, the portable fan adopts Figure 30 、 34 the current detection circuit 062 shown, the controller 02 can control the three-phase micromotor to work in a six-step commutation (i.e. square wave) control mode based on the total drive current IR_SUM sampled and the back electromotive force.

[0264] In some embodiments, the portable fan adopts Figure 34 、 35In the case of the current detection circuit 062 shown, the controller 02 controls the three-phase micromotor 04 to operate in FOC control based on the three-phase detection currents of the three-phase micromotor 04 obtained by sampling or after sampling calculation.

[0265] The controller 02 is further configured to control the drive bridge circuit 03 to output a sinusoidal three-phase alternating current to the three-phase micromotor 04 based on the output voltage of the rechargeable battery, so as to control the three-phase micromotor 04 to rotate in FOC control. Specifically:

[0266] ①Sample the three-phase currents of the three-phase micromotor 04 to obtain three-phase currents: ia, ib, and ic;

[0267] ②Convert the three-phase currents ia, ib, and ic to two-phase stationary coordinate system currents iα and iβ through Clarke transformation;

[0268] ③Convert the iα and iβ to two-phase rotating coordinate system currents iq and id through Park transformation;

[0269] ④Calculate the errors of iq and id and corresponding given values iq_Ref and id_Ref;

[0270] ⑤Input the above errors into two PI (proportional-integral) controllers to obtain output control voltages Vq and Vd;

[0271] ⑥Convert the control voltages Vq and Vd to two-phase stationary coordinate system voltages Vα and Vβ through inverse Park transformation;

[0272] ⑦Input the Vα and Vβ into an SVPWM (Space Vector Pulse Width Modulation) module for modulation, synthesize a voltage space vector, and output the switching states of the three drive bridge arms at this moment to control the motor to rotate

[0273] Repeat the above steps to implement FOC control of the three-phase micromotor 04 based on sinusoidal three-phase alternating current output. Since the sinusoidal three-phase alternating current has the characteristic of smooth change, the current has small sudden changes (compared with square wave alternating current) during driving the three-phase micromotor 04, the control is accurate, and the power consumption and noise of the motor are relatively low, so that the portable fan can achieve low power consumption, low noise, and long battery life.

[0274] Example Four

[0275] Please refer to Figure 23 and Figure 28 As an embodiment, the application further provides a three-phase micromotor for a portable fan.

[0276] The portable fan includes the three-phase micro motor-based portable fan as described above, the three-phase micro motor includes a stator coil and a rotor assembly, the rotor assembly includes a rotating shaft 18A connected with the fan blade 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. The drive bridge circuit 03 in the portable fan is connected with three electrodes of the stator coil.

[0277] Specifically, Figure 23 In the embodiment, the fan bearing 15 is the bearing of the three-phase micro motor, Figure 23 In the embodiment, the motor 12 marked by the reference sign 12 is actually the stator coil of the three-phase micro motor.

[0278] In some embodiments, the three-phase micro motor is an external rotor motor, the magnetic ring assembly 18 is arranged between the stator coil and the hub of the fan blade (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 micro motor further includes a snap ring 13 and a gasket 14, and the rotating shaft 18A is limited in the shaft cylinder 15A through the snap ring 13 and the gasket 14, so as to prevent the rotating shaft 18A from being separated from the shaft cylinder 15A. The stator coil generates a magnetic field after being electrified to drive the magnetic ring assembly 18 to drive the fan blade 19 to rotate.

[0279] In the embodiment, the external rotor three-phase micro motor is driven by three-phase alternating current, the torque is improved, energy saving is further realized, and the endurance time is improved by about 30%.

[0280] In some embodiments, the three-phase micro motor is an internal rotor motor, the magnetic ring assembly 18 of the internal 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 on the inner wall of the portable fan, the rotating shaft 18A is inserted and fixed on the inner wall of the portable fan through the bearing, and the fan blade 19 is fixed on one end of the rotating shaft 18A.

[0281] Example Five

[0282] As an implementation form, the application further provides a three-phase micro motor fan module for a portable fan. Please refer to Figure 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 Figures 23 to 25 The fan blade 19 is connected with the three-phase micro motor 04, three output ends of the drive bridge circuit 03 are connected with three electrodes of the three-phase micro motor 04, and the drive bridge circuit 03 is used to generate a three-phase alternating current of a sine wave to drive the three-phase micro motor 04 to start, stop or change speed.

[0283] It can be understood that the three-phase micromotor fan module of the embodiment can be sold or used independently as a modularized independent component / product, and can also be assembled with other components of the fan or a fan body to form a portable fan. The other components of the fan or the fan body include, for example, the housing 1, the power supply circuit 01, and the controller 02.

[0284] In some embodiments, the output voltage of the portable fan is 3 volts to 4.2 volts or 6 volts to 8.4 volts, the rechargeable battery of the portable fan is one, two or more sections, and the three-phase micromotor 04 includes an outer rotor three-phase micromotor to improve the use efficiency of the rechargeable battery through the outer rotor three-phase micromotor with large torque, thereby improving the endurance time during portable use.

[0285] It can be understood that the output voltage of the portable fan refers to the output voltage of the other components of the fan or the fan body on which the three-phase micromotor fan module is installed. The output voltage can be provided by the rechargeable battery or by the rechargeable battery through a conversion circuit. The terminal outputting the output voltage will be connected to the power supply bus of the drive bridge circuit 03, and the output voltage is connected to the drive bridge circuit 03.

[0286] It can be understood that the controller 02 in the other components of the fan or the fan body will be used to provide a control signal to control the drive bridge circuit 03 to generate a three-phase alternating current of a sine wave.

[0287] Example Six

[0288] Please refer to Figures 28 to 31 As an embodiment, the application also provides a drive bridge circuit 03 which can be used in the three-phase micromotor fan module of any of the above embodiments or the portable fan of any of the above embodiments.

[0289] The drive bridge circuit 03 includes a circuit substrate (not shown in the figure) and three output terminals A / B / C formed on the circuit substrate, which are respectively connected to three electrodes U / V / W of the three-phase micromotor 04 of the portable fan. The drive bridge circuit U / V / W is used to generate a three-phase alternating current of a sine wave to drive the three-phase micromotor 04 to start, stop or change speed.

[0290] It can be understood that the drive bridge circuit 03 can be made or sold independently as a modularized component, which can be used in the three-phase micromotor fan module or the portable fan, and can also be used in other application fields.

[0291] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A three-phase micro-motor fan module for portable fans, characterized in that, The three-phase micro-motor fan module includes a drive bridge circuit, a three-phase micro-motor, and fan blades. The fan blades are connected to the three-phase micro-motor. The three output terminals of the drive bridge circuit are connected to the three electrodes of the three-phase micro-motor. The drive bridge circuit is used to generate a sinusoidal three-phase AC power to drive the three-phase micro-motor to start, stop, or change speed.

2. The three-phase micro-motor fan module as described in claim 1, characterized in that, The drive bridge circuit 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 and negative terminals of the power supply bus. The three series nodes of the three drive bridge arms constitute the three output terminals of the drive bridge circuit. The controlled terminals of the three upper bridge arms and the controlled terminals 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 as described in claim 2, characterized in that, Each upper bridge arm includes a first switching transistor, and each lower bridge arm includes a second switching transistor. The first switching transistor and the second switching transistor are connected in series between the positive terminal and the negative terminal of the power supply bus. A series node of the first switching transistor and the second switching transistor constitutes an output terminal of the drive bridge circuit.

4. The three-phase micro-motor fan module as described in claim 3, characterized in that, Each of the upper bridge arms also includes a third switch, the control terminal of the first switch is connected to the first terminal of the third switch, the second terminal of the third switch is grounded, and the control terminal of the third switch constitutes the controlled terminal of the upper bridge arm.

5. The three-phase micro-motor fan module as described in any one of claims 1 to 4, characterized in that, The portable fan has an output voltage of 3V to 4.2V or 6V to 8.4V. The portable fan has one, two, or more rechargeable batteries. The three-phase micro motor includes an external rotor three-phase micro motor, which improves the efficiency of the rechargeable battery through the high torque of the external rotor three-phase micro motor, thereby increasing the battery life during portable use.

6. A portable fan based on a three-phase micro motor, characterized in that, The portable fan includes a housing, and a power supply circuit, a controller, a drive bridge circuit, a three-phase micro motor, and fan blades installed within the housing. The fan blades are connected to the three-phase micro motor. The power supply circuit includes a rechargeable battery and is connected to the power supply terminal of the controller and the power supply bus of the drive bridge circuit. The control pins of the controller are used to connect to the controlled terminal of the drive bridge circuit. The three output terminals of the drive bridge circuit are connected to the three electrodes of the three-phase micro motor. The controller is used to output control signals to control the drive bridge circuit to generate a sinusoidal three-phase AC power to drive the three-phase micro motor to start, stop, or change speed.

7. The portable fan as described in claim 6, characterized in that, The drive bridge circuit 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 and negative terminals of the power supply bus. The three series nodes of the three drive bridge arms constitute the three output terminals of the drive bridge circuit. The controlled terminals of the three upper bridge arms and the controlled terminals of the three lower bridge arms are respectively used to connect to the six control pins of the controller.

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

9. The portable fan as described in claim 8, characterized in that, Each of the upper bridge arms also includes a third switch, the control terminal of the first switch is connected to the first terminal of the third switch, the second terminal of the third switch is grounded, and the control terminal of the third switch constitutes the controlled terminal of the upper bridge arm.

10. The portable fan as claimed in any one of claims 6 to 9, characterized in that, The portable fan also includes a three-phase micro motor fan module, which includes the drive bridge circuit, the three-phase micro motor, and the fan blades.

11. The portable fan as claimed in any one of claims 6 to 9, characterized in that, Also includes: An input module, connected to the controller, is used to generate input signals to the controller in response to user operation; A detection circuit is connected to the controller, the drive bridge circuit, and the three-phase micro motor, and is used to detect and output the operating electrical parameters of the three-phase micro motor and the drive bridge circuit; The controller is also used to modulate the control signal according to the input signal and the operating electrical parameters to adjust the three-phase AC power, thereby realizing the speed adjustment, start-up or shutdown of the three-phase micro motor.

12. The portable fan as claimed in claim 11, characterized in that, The detection circuit includes: A voltage detection circuit, connected to the positive terminal of the power supply bus, is used to detect the power supply voltage of the power supply circuit and output a voltage detection signal; The current detection circuit is connected to the negative terminal of the power supply bus to detect the operating current of the three-phase micro motor and output a current detection signal. The back EMF detection circuit is connected to the three output terminals of the drive bridge circuit and is used to detect and output the back EMF of the three-phase micro motor.

13. The portable fan as claimed in claim 11, characterized in that, The detection circuit also includes an overcurrent protection circuit, which is connected to the negative terminal of the power supply bus and is used to output an overcurrent trigger signal when the operating current of the three-phase micro motor reaches the overcurrent threshold. The controller is also used to control the drive bridge circuit to shut off the output of the three-phase AC power according to the overcurrent trigger signal.

14. The portable fan as claimed in claim 12, characterized in that: The current detection circuit includes: The first sampling resistor is connected in series with the negative terminal of the power supply bus between the power supply circuit and the drive bridge circuit; and A first differential amplifier circuit, wherein the positive input terminal and the negative output terminal of the first differential amplifier circuit are respectively connected to the two ends of the first sampling resistor, and the output terminal of the first differential amplifier circuit is connected to the controller; or The current detection circuit includes: Two second sampling resistors are connected in series at one end of the negative terminal of the power supply bus to which any two drive bridge arms of the drive bridge circuit are connected; and Two second differential amplifier circuits are connected to two second sampling resistors respectively, and the output terminals of the two second differential amplifier circuits are connected to the controller. In this configuration, the positive input terminal and negative output terminal of each of the second differential amplifier circuits are respectively connected to the two ends of the corresponding second sampling resistor; or The current detection circuit includes: Three second sampling resistors are respectively connected in series at one end of the negative terminal of the power supply bus to which the three drive bridge arms of the drive bridge circuit are connected; and Three second differential amplifier circuits are connected to three second sampling resistors respectively, and the output terminals of the three second differential amplifier circuits are connected to the controller. In this circuit, the positive input terminal and the negative output terminal of each of the second differential amplifier circuits are respectively connected to the two ends of the corresponding second sampling resistor.

15. The portable fan as claimed in claim 12, characterized in that, The back EMF detection circuit includes three back EMF detection sub-circuits. Each back EMF detection sub-circuit includes a first voltage divider, a second voltage divider, and a filter. The first and second voltage dividers 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. The series connection node of the first and second voltage dividers is also connected to the back EMF reference pin and the back EMF detection pin of the controller.

16. The portable fan as claimed in 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 as claimed in any one of claims 6 to 9, characterized in that, The rechargeable battery has an output voltage of 3V to 4.2V or 6V to 8.4V. The rechargeable battery can be one, two, or more cells. The power supply circuit also includes a power supply circuit. The positive terminal of the rechargeable battery is used to connect to the positive terminal of the power supply bus of the drive bridge circuit and the positive terminal of the power supply circuit. The negative terminal of the rechargeable battery is used to connect to the negative terminal of the power supply bus of the drive bridge circuit and the negative terminal of the power supply circuit. The output of the power supply circuit is connected to the power supply terminal of the controller.

18. The portable fan as claimed in claim 17, characterized in that, The controller is also used to drive the drive bridge circuit to output a sinusoidal three-phase AC power based on the output voltage of the rechargeable battery to the three-phase micro motor, and control the rotation of the three-phase micro motor in a magnetic field vector control manner.

19. A drive bridge circuit for a three-phase micro-motor fan module as described in any one of claims 1-5, or for a portable fan as described in any one of claims 6-18, characterized in that, The drive bridge circuit includes a circuit board and three output terminals formed on the circuit board. The three output terminals are respectively connected to the three electrodes of the three-phase micro motor of the portable fan. The drive bridge circuit is used to generate a sinusoidal three-phase AC power to drive the three-phase micro motor to start, stop or change speed.

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