PORTABLE FAN WITH HIGH-SPEED THREE-PHASE MOTOR, MOTOR DRIVE CONTROL CIRCUIT AND CONTROL PROCEDURE

Abstract

A portable fan is provided, configured with a high-speed three-phase motor and a control system. The portable fan includes a drive module and the high-speed three-phase motor. The high-speed three-phase motor has an operating voltage of 2V to 18V and an operating current of 0.1 to 10A, or a rated operating power of 0.5 to 100W. The control module is configured to regulate the high-speed three-phase motor's rated rotational speed based on the operating voltage, current, or rated operating power. This reduces noise generated by the motor's high rotational speed and controls the airflow within a preset range.In the technical solution of the present invention, the control module, drive module, and high-speed three-phase motor are combined to provide a portable fan with high operating efficiency, low noise generation, and adjustable air speed. Low-voltage drive technology and a control strategy are applied to enhance the fan's portability and ease of use, improving the user experience.

Description

A motor drive control circuit, a portable fan based on a high-speed three-phase motor and a control method thereof Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a portable fan based on a high-speed three-phase motor and a control method thereof. Background Art

[0002] Currently, high-speed three-phase motors are primarily used in industrial equipment, power tools, aerospace, and automotive applications. For example, high-speed motors are required for high-speed rotation in machine tools to improve production efficiency and machining precision, while automobiles require them for increased power output and fuel efficiency. Generally, high-speed three-phase motors operate at speeds ranging from tens of thousands to hundreds of thousands of revolutions per minute (RPM). Because these devices require powerful power, high-speed three-phase motors are typically powered by mains electricity, with voltages ranging from 110V to 240V, to ensure stable, high-speed output. High-speed motors are relatively expensive to manufacture, typically ranging from tens to hundreds of yuan. This is because high-speed three-phase motors require higher material strength and more sophisticated manufacturing processes to ensure stability and durability at high speeds. Therefore, conventional wisdom suggests that high-speed three-phase motors are not typically used in small portable fans, which cost only a few dozen yuan. Due to cost constraints, small portable fans typically use low-cost DC motors (such as brushless DC motors or brushed DC motors), which have lower operating speeds and manufacturing costs, making them more suitable for the lower-priced market. Take industry giant Dyson, for example. Its high-end vacuum cleaners and hair dryers utilize high-speed single-phase motors, rather than three-phase motors. Dyson's design takes into account factors such as product market positioning, cost control, and user needs. Compared to three-phase motors, single-phase motors offer a simpler structure, easier control, and lower cost, meeting the demands of home appliances.

[0003] In summary, there is currently no precedent in the industry for applying high-speed three-phase motors to small portable fans. This is because the high cost and high power consumption of high-speed motors do not meet the low cost and low power consumption requirements of small portable fans.

[0004] Portable fans, thanks to their compact size, light weight, and portability, have gradually become essential gadgets for everyday use and everyday life. They not only provide a convenient way to cool down, but also offer a great deal of comfort during the hot summer months, making them an ideal choice for both travel and home use. However, existing portable fans often suffer from relatively slow motor speeds, limited airflow and volume, and high vibration and noise levels, hindering optimal comfort in varying environments and settings.

[0005] Existing motor drive circuits have slow response, complex control logic, and a small current adjustment range for the motor stator winding, which affects the performance of portable fans in various high-temperature scenarios.

[0006] Summary of the Invention

[0007] The embodiments of the present invention provide a portable fan based on a high-speed three-phase motor and a control method thereof to solve the above technical problems.

[0008] A first aspect of an embodiment of the present invention provides a portable fan based on a high-speed three-phase motor, comprising: a control module, a drive module, and a high-speed three-phase motor, wherein the operating voltage of the high-speed three-phase motor is 2 to 18 volts, the operating current of the high-speed three-phase motor is 0.1 to 10 amperes, and / or the rated operating power of the high-speed three-phase motor is 0.5 to 100 watts;

[0009] The control module controls the rated operating speed of the high-speed three-phase motor through the drive module according to the operating voltage, the operating current and / or the rated operating power, so as to reduce the high-speed noise of the high-speed three-phase motor and control the wind speed within a preset wind speed range.

[0010] A second aspect of an embodiment of the present invention provides a control method for the portable fan according to the first aspect, the control method comprising:

[0011] Controlling the operating voltage of the high-speed three-phase motor to 2 to 18 volts, controlling the operating current of the high-speed three-phase motor to 0.1 to 10 amps, and / or controlling the rated operating power of the high-speed three-phase motor to 0.5 to 100 watts;

[0012] The rated operating speed of the high-speed three-phase motor is controlled by the driving module according to the operating voltage, the operating current and / or the rated operating power, so as to reduce the high-speed noise of the high-speed three-phase motor and control the wind speed within a preset wind speed range.

[0013] The technical effect of the embodiment of the present invention is: This technical solution provides a high-efficiency, low-noise, adjustable wind speed portable fan solution by combining a control module, a drive module and a high-speed three-phase motor. Through low-voltage drive technology and control strategy, the portability and comfort of the fan are improved, thereby enhancing the user experience.

[0014] The purpose of the utility model is to provide a motor drive control circuit for a portable fan to solve the technical problems existing in the prior art.

[0015] A motor drive control circuit for a portable fan includes: a battery power supply, a voltage stabilizing unit, a main control unit, a motor, a USB access circuit, an analog-to-digital converter power supply circuit, and a display unit; the motor drive control circuit for the portable fan includes at least one of a motor drive control unit, a motor drive circuit, and a rotor position detection circuit.

[0016] Optionally, the permanent magnet is arranged on the rotor of the motor, and the first winding, the second winding, and the third winding are arranged on the stator of the motor in a Y-type connection; the MOS tube switch circuit of the motor drive circuit connects the first winding, the second winding, and the third winding of the motor, and the motor drive control unit controls the current size, flow direction or phase relationship of each phase winding.

[0017] Optionally, one end of the first MOS transistor switch is connected to the power supply voltage and the other end is connected to the first winding, and the conduction of the first MOS transistor switch is controlled by the second MOS transistor switch; one end of the second MOS transistor switch is connected to the power supply voltage VBAT through the first resistor, and the other end is grounded; the second MOS transistor switch receives the pulse modulation control signal PWM_AH of the motor drive control unit.

[0018] Optionally, one end of the third MOS transistor switch is connected to the first winding, and the other end is grounded via a current sampling resistor. The third MOS transistor switch receives a pulse modulation control signal PWM_AL from the motor drive control unit.

[0019] Optionally, a reverse diode is provided on the MOS tube switch.

[0020] Optionally, the first MOS transistor switch is a P-type MOS transistor, and the second and third MOS transistor switches are N-type MOS transistors.

[0021] Optionally, the second resistor is connected to the drain and source of the second MOS transistor switch, and the third resistor is connected to the drain and source of the third MOS transistor switch.

[0022] Optionally, the MOS tube switch circuit composed of the fourth, fifth, and sixth MOS tube switches and the fourth, fifth, and sixth resistors controls the inflow and outflow of the second winding current; the MOS tube switch circuit composed of the seventh, eighth, and ninth MOS tube switches and the seventh, eighth, and ninth resistors controls the inflow and outflow of the third winding current.

[0023] Optionally, the motor drive control unit includes a motor drive chip, which outputs a motor drive signal to the gate of the MOS tube of the motor drive circuit.

[0024] Optionally, the main control unit includes a control chip, which is connected to a USB access circuit, a battery voltage detection analog-to-digital conversion circuit, and a display unit.

[0025] The charging management circuit of the handheld turbo fan of the present application has a fast response speed, simple control logic, a large current adjustment range of the stator winding, and integrates functions such as MOS tube electrostatic protection, circuit overvoltage and overcurrent protection, and temperature and power display. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] FIG1 is a schematic structural diagram of a portable fan based on a high-speed three-phase motor provided in a first embodiment of the present invention;

[0028] FIG2 is another structural diagram of a portable fan based on a high-speed three-phase motor provided in the first embodiment of the present invention;

[0029] FIG3 is another structural diagram of a portable fan based on a high-speed three-phase motor provided in the first embodiment of the present invention;

[0030] FIG4 is a circuit diagram of a touch-slide adjustment chip in a portable fan based on a high-speed three-phase motor provided by Embodiment 1 of the present invention;

[0031] FIG5 is a circuit diagram of a touch screen connector in a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0032] 6 is a schematic diagram of a display interface of a control device in a portable fan based on a high-speed three-phase motor provided in the first embodiment of the present invention;

[0033] 7 is a circuit diagram of a single-touch touch screen chip in a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0034] FIG8 is another structural diagram of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0035] FIG9 is a schematic structural diagram of a voice module in a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0036] 10 is a circuit diagram of a voice acquisition module in a voice module of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0037] 11 is a circuit diagram of a voice recognition module in a voice module of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0038] 12 is a schematic structural diagram of a voice output module in a voice module of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0039] 13 is a circuit diagram of a voice output module in a voice module of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0040] FIG14 is another structural diagram of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0041] FIG15 is another structural diagram of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0042] 16 is a schematic structural diagram of a driving module in a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0043] 17 is a schematic structural diagram of a motor in a portable fan based on a high-speed three-phase motor according to a first embodiment of the present invention;

[0044] FIG18 is a circuit diagram of a driving module in a portable fan based on a high-speed three-phase motor according to a first embodiment of the present invention;

[0045] FIG19 is another circuit diagram of a driving module in a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0046] FIG20 is another structural diagram of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0047] FIG21 is an exploded view of the structure of an embodiment of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0048] FIG22 is an exploded view of another embodiment of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0049] FIG23 is an exploded view of the first part of another embodiment of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0050] FIG24 is an exploded view of the second part of the structure of another embodiment of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0051] FIG25 is an exploded view of the third portion of another embodiment of a portable fan based on a high-speed three-phase motor provided in Example 1 of the present invention;

[0052] FIG26 is a flow chart of a method for controlling a portable fan provided by Embodiment 2 of the present invention;

[0053] FIG27 is a schematic structural diagram of another embodiment of a portable fan based on a high-speed three-phase motor according to the first embodiment of the present invention;

[0054] FIG28 is a block diagram of a motor drive control circuit for a portable fan;

[0055] FIG29 is a schematic diagram of a voltage stabilizing unit circuit;

[0056] Figure 30 is a schematic diagram of the motor drive control circuit;

[0057] Figure 31 is a schematic diagram of a rotor position detection circuit;

[0058] FIG32 is a circuit diagram of a motor drive control unit;

[0059] Figure 33 is a schematic diagram of the main control unit circuit;

[0060] Figure 34 is a schematic diagram of the display unit circuit. DETAILED DESCRIPTION

[0061] In order to fully understand the present invention, detailed structures and steps will be provided in the following description to illustrate the technical solutions proposed by the present invention. Preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementations.

[0062] Example 1

[0063] A first embodiment of the present invention provides a portable fan, which solves the problem in the prior art of using a mechanical switch, where the user cannot adjust the wind speed to any level as needed, resulting in a poor user experience.

[0064] Embodiment 1 of the present invention provides a portable fan based on a high-speed three-phase motor, as shown in Figure 1, comprising: a control module 102, a drive module 103 and a high-speed three-phase motor 104, wherein the operating voltage of the high-speed three-phase motor 104 is 2 to 18 volts, the operating current of the high-speed three-phase motor 104 is 0.1 to 10 amps, and / or the rated operating power of the high-speed three-phase motor 104 is 0.5 to 100 watts; the control module 102 controls the rated operating speed of the high-speed three-phase 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 high-speed three-phase motor 104 and control the wind speed to be within a preset wind speed range.

[0065] This technical solution, through the coordinated operation of control module 102 and drive module 103, achieves low-voltage drive of a high-speed three-phase motor to meet the specific needs of a portable fan. This requires adjusting the number of slots and pole pairs to accommodate low-voltage operation, selecting high-performance core materials to reduce magnetic losses and improve operating efficiency under low voltage conditions, and providing an efficient inverter to convert low-voltage direct current into three-phase alternating current, ensuring power supply stability and preventing voltage fluctuations from affecting motor performance.

[0066] Among them, the operating voltage range is 2 to 18 volts, the operating current range is 0.1 to 10 amps, and the rated operating power range is 0.5 to 100 watts. The design of the high-speed three-phase motor 104 can provide a more efficient speed and power output at low voltage compared to existing portable fan motors, which is suitable for the needs of portable devices. The control module 102 accurately controls the high-speed three-phase motor 104 based on the real-time monitoring of the operating voltage, operating current and rated operating power. By adjusting the power supply parameters of the high-speed three-phase motor 104, the control module 102 can effectively reduce the noise generated when the motor runs at high speed. The control module 102 can also adjust the wind speed of the fan so that it is within the preset wind speed range, ensuring user comfort and equipment stability compared to single-phase low-speed motors. The drive module 103 connects the control module 102 and the high-speed three-phase motor 104, converting the instructions of the control module 102 into actual motor drive signals. The drive module 103 uses efficient inverter technology to convert low-voltage direct current into alternating current suitable for the high-speed three-phase 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 of the control module 102.

[0067] The technical effect of this embodiment is that: this technical solution provides a high-efficiency, low-noise, and adjustable wind speed portable fan solution by combining a control module, a drive module, and a high-speed three-phase motor. Through low-voltage drive technology and precise control strategy, it not only improves the portability and comfort of the fan, but also effectively improves the overall performance and energy efficiency of the device. This design solution is suitable for portable fan application scenarios that require high performance and low noise, filling the gap in the application of high-speed three-phase motors in small portable devices on the market.

[0068] Specific applications of this embodiment 1 include but are not limited to the following implementations:

[0069] As an embodiment, the operating voltage of the high-speed three-phase motor 104 is 6 to 8.4 volts, the operating current of the high-speed three-phase motor 104 is 0.12 to 1 amp, and / or the rated operating power of the high-speed three-phase motor 104 is 0.8 to 9 watt-hours. The control module 102 controls the rated operating speed of the high-speed three-phase motor 104 to 6000-15000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0070] Among them, the high-speed three-phase motor 104 is driven by a voltage range of 6-8.4V, suitable for power supply by two batteries in series, with an operating current range of 0.12-1A, ensuring stable operation at different speeds, and a power range of 0.8W-9W, meeting the power requirements of a portable fan. The control module 102 monitors the operating voltage, current, and power of the motor in real time and adjusts according to these parameters. The control module 102 can accurately control the speed of the motor with an adjustment range of 6000-15000RPM. The drive module 103 converts the 6-8.4V DC power into three-phase AC power and drives the high-speed three-phase motor 104 through inverter technology. The battery uses two batteries in series to provide a stable voltage. The fan has 4 pole pairs, 12 slots, 5 blades, and 6 guide vanes / impellers.

[0071] As an embodiment, when the operating voltage of the high-speed three-phase motor 104 is 5.9 to 8.4 volts, the operating current of the high-speed three-phase motor 104 is 0.5 to 6 amps, and / or the rated operating power of the high-speed three-phase motor 104 is 5 to 50 watts, the control module 102 controls the rated operating speed of the high-speed three-phase motor 104 to 20,000-80,000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0072] The high-speed three-phase motor 104 is driven by a voltage range of 5.9-8.4V, which can be 5.9V, 6.0V, 6.5V, 7.2V, ..., and 8.4V, suitable for powering two batteries connected in series. The operating current range is 0.5-6A, ensuring stable operation at various speeds. The power range is 5W-50W, meeting the power requirements of a portable fan. The control module 102 monitors the motor's operating voltage, current, and power in real time and adjusts them accordingly. The control module 102 can precisely control the motor's speed within a range of 20,000-80,000 RPM. The drive module 103 converts the 5.9-8.4V DC power into three-phase AC power, driving the high-speed three-phase motor 104 using inverter technology. Two batteries are connected in series to provide a stable voltage. The fan has one pole pair, six slots, 13 blades, and six guide vanes / impellers.

[0073] As an embodiment, the operating voltage of the high-speed three-phase motor 104 is 2 to 5.8 volts, the operating current of the high-speed three-phase motor 104 is 0.25 to 2 amps, and / or the rated operating power of the high-speed three-phase motor 104 is 1 to 8 watt-hours. The control module 102 controls the rated operating speed of the high-speed three-phase motor 104 to 15000-41000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0074] The high-speed three-phase motor 104 is driven by a voltage range of 2-5.8V, which can be 2V, 2.1V, 2.5V, 3.7V, ..., 4.3V, or 5.8V. It is suitable for powering two batteries connected in series. The operating current range is 0.25-1.8A, ensuring stable operation at various speeds. The power range is 1W-8W, meeting the power requirements of a portable fan. The control module 102 monitors the motor's operating voltage, current, and power in real time and adjusts accordingly. The control module 102 can precisely control the motor's speed within a range of 15,000-41,000 RPM. The drive module 103 converts the 2-5.8V DC power into three-phase AC power, driving the high-speed three-phase motor 104 using inverter technology. Two batteries are connected in series to provide a stable voltage. The fan has four pole pairs, nine slots, nine blades, and seven guide vanes / impellers.

[0075] In one embodiment, when the operating voltage of the high-speed three-phase motor 104 is 8.5 to 12.6 volts, the operating current of the high-speed three-phase motor 104 is 0.5 to 5 amperes, and / or the rated operating power of the high-speed three-phase motor 104 is 6 to 60 watts, the control module 102 controls the rated operating speed of the high-speed three-phase motor 104 to 25,000 to 85,000 RPM / min via the drive module 103 based on the operating voltage, operating current, and / or rated operating power.

[0076] The high-speed three-phase motor 104 operates with a voltage range of 8.5-12.6V, which can be 8.5V, 9.0V, 10.5V, 12.0V, ..., and 12.6V. It is suitable for powering three batteries connected in series. The operating current range is 0.5-5A, ensuring stable operation at various speeds. The power range is 6W-60W, meeting the power requirements of a portable fan. The control module 102 monitors the motor's operating voltage, current, and power in real time and adjusts them accordingly. The control module 102 can precisely control the motor's speed within a range of 25,000-85,000 RPM. The drive module 103 converts the 8.5-12.6V DC power into three-phase AC power, driving the high-speed three-phase motor 104 using inverter technology. Three batteries are connected in series to provide a stable voltage. The fan has one pole pair, six slots, 13 blades, and six guide vanes / impellers.

[0077] As an embodiment, when the operating voltage of the high-speed three-phase motor 104 is 12 to 18 volts, the operating current of the high-speed three-phase motor 104 is 0.1 to 1 amp, and / or the rated operating power of the high-speed three-phase motor 104 is 2 to 16 watts, the control module 102 controls the rated operating speed of the high-speed three-phase motor 104 to 2000-6000 RPM / MIN through the drive module 103 according to the operating voltage, operating current and / or rated operating power.

[0078] The high-speed three-phase motor 104 is driven by a voltage range of 12-18V, which can be 12V, 12.5V, 14V, 16.8V, ..., or 18V. It is suitable for powering four batteries connected in series. The operating current range is 0.1-1A, ensuring stable operation at various speeds. The power range is 2W-16W, meeting the power requirements of a portable fan. The control module 102 monitors the motor's operating voltage, current, and power in real time and adjusts them accordingly. The control module 102 can precisely control the motor's speed within a range of 2000-6000 RPM. The drive module 103 converts the 12-16.8V DC power into three-phase AC power, driving the high-speed three-phase motor 104 using inverter technology. Four batteries are connected in series to provide a stable voltage. The fan has four pole pairs, six slots, nine blades, and ten guide vanes / impellers.

[0079] As an embodiment, the operating voltage of the high-speed three-phase motor is 3.7 volts or 4.3 volts, the operating current of the high-speed three-phase motor is 0.25 to 2 amps, and / or the rated operating power of the high-speed three-phase motor is 1 to 8 watts. The control module controls the rated operating speed of the high-speed three-phase motor to be 15000-41000 RPM / MIN through the drive module according to the operating voltage, the operating current and / or the rated operating power.

[0080] As an embodiment, this embodiment provides a portable fan, as shown in Figure 2, including: an input module 101, a control module 102, a drive module 103 and a high-speed three-phase motor 104 connected in sequence, the drive module 103 includes a first bridge arm, a second bridge arm and a third bridge arm, and the midpoint of each bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube on both sides, and the midpoint of each bridge arm is connected to a phase coil of the high-speed three-phase motor 104; the input module 101 outputs a wind speed adjustment control signal according to user instructions, the control module 102 generates a PWM control signal according to the wind speed adjustment control signal, and controls the switch tube of each bridge arm through the PWM control signal to adjust the speed of the high-speed three-phase motor 104.

[0081] 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 high-speed three-phase motor 104 to start or stop running.

[0082] When the user's instruction is to turn on the fan, the input module 101 outputs a switch signal based on 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 based on the user's instruction. The user can input control instructions in various ways depending on the type of input module 101. For example, the input module 101 can input instructions through touch, voice, or other input methods. If the input module 101 is a touch module 111, the input module 101 generates a switch signal when it detects a touch action. If the input module 101 detects a sliding action, it generates a wind speed adjustment signal. If 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. If the input module 101 is a networking module 106, it receives remote control signals or wind speed adjustment parameters set by the user. The input module 101 can also be a multi-functional input module, enabling various functions such as timing control, lighting control, head movement control, spray control, and cooling control. 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. Lighting control refers to the user adjusting the light switch status, brightness and color through the touch module 111, or remotely controlling the light through the voice module 112 and the networking module 106. The shaking head function refers to the user setting the shaking head angle and speed of the fan through the touch module 111, or remotely controlling the shaking head function through the voice module 112 and the networking module 106. The spray function refers to the user turning on or adjusting the spray volume through the touch module 111, or remotely controlling the spray function through the voice module 112 and the networking module 106. The cooling function refers to the user adjusting the cooling intensity of the fan through the touch module 111, or remotely controlling the cooling function through the voice module 112 and the networking module 106. Multiple function controls are achieved through the input module, allowing users to use and adjust the fan more flexibly to meet the needs of different usage scenarios.

[0083] The input module 101 and the control module 102 are connected via a wired or wireless manner, and the input module is disposed on a housing of a portable fan or other electronic device.

[0084] Among them, the input module 101 and the control module 102 are connected in a wired manner, for example, through an I2C cable, an SPI cable, a UART cable, a GPIO interface, a USB interface, a CAN bus, an I2S interface, and an ADC interface. The I2C cable (Inter-Integrated Circuit) is a serial communication protocol that is commonly used to connect low-speed peripheral devices (such as touch modules) to the mainboard, using two wires (SDA and SCL) for data transmission and clock synchronization. The SPI cable (Serial Peripheral Interface) is a high-speed synchronous serial communication protocol that uses four wires (MISO, MOSI, SCK, and SS) for data transmission. The UART cable (Universal Asynchronous Receiver-Transmitter) is an asynchronous serial communication protocol that uses two wires (Tx and Rx) for data transmission. The GPIO interface (General-Purpose Input / Output) is a universal digital signal input / output interface that can be configured as input or output mode. The USB interface (Universal Serial Bus) is a universal high-speed serial communication interface that supports plug-and-play and hot-swap. 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 into digital signals. Signal transmission between the input module 101 and the control module 102 is achieved through wireless communication technologies such as Wi-Fi, Bluetooth, Zigbee, etc. The input module 101 is directly integrated into the casing of the portable fan and is suitable for occasions where the user wants to operate the fan directly, such as adjusting the wind speed through a touch screen or turning the fan on and off with a button. The input module 101 can also be separated from the portable fan and installed on other electronic devices (such as smart phones, tablets, smart watches, etc.), and connected to the fan's control module wirelessly, making the control of the portable fan more flexible and convenient, and the user can remotely control it through existing electronic devices. Among them, the wireless module can be a Bluetooth module, a Wi-Fi module, an infrared module, a 433MHz wireless module, and can also be the following wireless modules: Zigbee module, Z-Wave module, LoRa (Long Range) module, NFC (Near Field Communication), 2.4GHz dedicated wireless module, 5G, etc.The control module 102 receives signals from the input module 101 and processes them. Based on the switching signals, it generates a switch control signal for controlling the start and stop of the high-speed three-phase motor 104. It also calculates and adjusts the control signal for the portable fan based on the wind speed adjustment signal. This control signal includes, but is not limited to, PWM (pulse width modulation), PPM (pulse position modulation), a data protocol, or other custom protocols. PWM signals are a commonly used control method that adjusts the motor speed by changing the signal's duty cycle (i.e., the ratio of the high-level time to the period). PPM signals transmit information by changing the position of the pulse within a period. The data protocol can be a standard communication protocol (such as I2C, SPI, or UART) or a custom communication protocol for transmitting more complex control instructions. Custom protocols are designed to specify the control signal format and transmission method based on 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 based on the switching 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 based on the remote control signal. The drive module 103 consists of three bridge arms, each of which includes an upper bridge arm switching tube and a lower bridge arm switching tube, connected to the phase coils of the high-speed three-phase motor 104. The control module 102 controls the switching tube of each bridge arm through a switch control signal to start or stop the high-speed three-phase motor 104. The switching tube of each bridge arm is controlled by a PWM control signal to adjust the speed of the high-speed three-phase motor 104. The six-step commutation method can be used to control the start, stop, and speed of the motor. At each moment, only two MOS tubes are turned on, forming 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 achieved to drive the motor. Each commutation state corresponds to a pair of conductive MOS tubes, and the remaining MOS tubes remain off. The high-speed three-phase motor 104 receives the signal from the drive module 103, starts to operate, and provides the corresponding wind speed.

[0085] The technical effect of the first embodiment of the present invention is that: through the switch signal and wind speed adjustment control signal output by the input module, the control module can generate a switch control signal and a PWM control signal, and the user can adjust the operating status and wind speed of the fan as needed to achieve flexible wind speed adjustment; compared with the traditional mechanical switch method, this technical solution allows the user to select the appropriate wind speed according to specific needs, enhances the convenience and comfort of use, and improves the user experience.

[0086] As an embodiment, as shown in Figure 3, 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 based on the switch signal; when the touch module 111 detects a sliding action, it outputs a wind speed adjustment signal, and the control module 102 calculates the PWM signal duty cycle based on the wind speed adjustment signal, and generates a PWM control signal based on the PWM signal duty cycle.

[0087] The touch module 111 detects user touch and sliding motions. When a user touches the touch module 111, the touch module 111 detects the touch motion 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, generating a switch control signal for controlling the start and stop of the high-speed three-phase motor 104. The control module 102 receives and processes the wind speed adjustment signal and calculates the required PWM signal duty cycle based on the wind speed adjustment signal.

[0088] Among them, the control module 102 calculates the PWM signal duty cycle using different calculation methods according to different sliding parameters, and the sliding parameters may include the following: sliding distance: the distance the user slides the finger on the touch area; sliding speed: the speed at which the user slides the finger; sliding direction: the direction in which the user slides the finger (such as up and down, left and right); sliding position: the starting and ending positions of the user's sliding finger on the touch area.

[0089] The specific steps for calculating the duty cycle, taking the sliding distance as the main parameter, are as follows:

[0090] When the user starts sliding on the touch area, the starting position is recorded. When the user finishes sliding on the touch area, the ending position is recorded. The distance between the starting position and the ending position is used as the sliding distance. For example, let the starting position be P1 and the ending position be P2. The sliding distance D can be expressed as: D = P2-P1. Define the maximum distance Dmax that the user may slide on the touch area. Compare the actual sliding distance D with the maximum sliding distance Dmax, calculate the sliding distance ratio R, and ensure that R is between 0 and 1. Set the minimum and maximum values ​​of the PWM signal duty cycle. For example, the minimum value is 0% and the maximum value is 100%. According to the sliding distance ratio, the corresponding PWM signal duty cycle is calculated according to the corresponding relationship, and the PWM control signal is output according to the PWM signal duty cycle. The generated PWM control signal is sent to the drive module 103 to adjust the speed of the high-speed three-phase motor 104 to achieve a change in wind speed.

[0091] Among them, taking the sliding time as the main parameter, the specific steps for calculating the duty cycle are as follows:

[0092] When a user swipes on the touch panel, the touch module 111 detects the swipe and records the start and end times of the swipe. The touch module 111 transmits the swipe time to the control module 102, which calculates the normalized swipe time and generates the corresponding PWM duty cycle. The control module 102 sends the PWM signal to the driver module 103, which controls the speed of the high-speed three-phase motor 104 by adjusting the switching frequency and duty cycle of the switch.

[0093] The specific steps for calculating the duty cycle, taking the click position as the main parameter, are as follows:

[0094] When a user clicks a location on the touch module 111, the touch module 111 detects the coordinates of the clicked location (e.g., X and Y coordinates). The touch module 111 uses the clicked location coordinates as click parameters to generate a wind speed adjustment signal. Based on the clicked location, the control module 102 calculates the required PWM signal duty cycle. For example, the touch area is divided into multiple zones, each corresponding to a different wind speed level. Assume that the touch area of ​​the touch module 111 is divided into five equal zones, and clicking each zone corresponds to a wind speed level: Zone 1 (leftmost) is for low wind speed, Zone 2 (middle) is for medium wind speed, and Zone 5 (rightmost) is for high wind speed. When the user clicks the rightmost side of the touch area (Zone 5), the touch module 111 detects the clicked location coordinates and generates a corresponding wind speed adjustment signal. The control module 102 receives the wind speed adjustment signal and, based on the clicked location (Zone 5), calculates the PWM signal duty cycle required for the high wind speed level. The control module 102 generates a PWM control signal and sends it to the driver module 103. The driving module 103 adjusts the rotation speed of the high-speed three-phase motor 104 to a high wind speed gear by controlling the conduction time of the upper bridge arm switch tube and the lower bridge arm switch tube.

[0095] As an embodiment, the touch module 111 can adopt a touch sliding adjustment chip, which includes multiple contacts. When the user operates the fan through the touch screen, the touch sliding adjustment chip detects the touch action through these contacts. If the pressure caused by the touch action is detected, the touch module 111 generates a switch signal. The touch sliding adjustment chip transmits the switch signal to the control module 102. After receiving the switch signal, the control module 102 generates a switch control signal to control the switch tube in the drive module 103, thereby realizing the start or stop of the high-speed three-phase motor 104, that is, turning the fan on or off. In addition to detecting touch actions, the touch sliding adjustment chip can also detect the user's sliding parameters on the touch screen, including sliding gestures, sliding distance, sliding speed, number of slides and sliding time. These parameters are transmitted to the control module 102 through the touch module 111. The control module 102 generates a corresponding PWM control signal according to the preset logic to adjust the wind speed of the portable fan. The control module 102 generates a corresponding PWM control signal according to the sliding parameters. The PWM control signal is used to control the switch tube in the driving module 103 to adjust the speed of the high-speed three-phase motor 104, thereby achieving wind speed regulation.

[0096] Among them, there are multiple contact points on the touch sliding adjustment chip. When the user performs a touch sliding operation on the contact points, the chip will detect the touch action and sliding parameters (such as sliding distance, sliding speed, etc.). The sliding parameters detected by the chip include the distance and speed of the user sliding on the touch screen. These parameters reflect the degree to which the user wants to adjust the wind speed. Based on the detected sliding parameters, the touch sliding adjustment chip generates a wind speed adjustment control signal. After receiving the wind speed adjustment control signal, the control module calculates the corresponding PWM signal duty cycle based on the signal size. The higher the duty cycle, the higher the motor speed; the lower the duty cycle, the lower the motor speed. The control module sends the generated PWM signal to the drive module, and the drive module controls the motor speed. By adjusting the duty cycle of the PWM signal, precise control of the motor speed is achieved, thereby adjusting the fan's wind speed.

[0097] As an example, as shown in Figure 4, U5 is a touch chip. Pins PA0 to PA4 of the touch chip U5 can be connected to the control module 102 through the above-mentioned connection method. The touch chip U5 includes at least contacts K2, K3, K4, K5, K6 and K7. Each contact can detect touch actions. Different contacts can be used to detect sliding parameters such as sliding gestures, sliding distance, sliding speed, number of slides and sliding time.

[0098] The technical benefit of this embodiment is that, compared to traditional portable fans, which rely solely on a mechanical switch to control the fan's gear position, the touch module enables more diverse control methods. Users can not only turn the fan on and off with a simple touch, but also flexibly adjust the wind speed by sliding. The use of a touch-slide adjustment chip makes fan operation more convenient and intuitive. Instead of repeatedly pressing a mechanical switch, users can easily control the fan's on / off and wind speed simply by touching and sliding, improving operational efficiency and user experience. The control module generates precise PWM control signals based on the detected sliding parameters, enabling precise control of the fan's wind speed. Users can flexibly adjust the wind speed as needed, resulting in a more comfortable user experience.

[0099] As a second embodiment of the touch module 111, the touch module 111 can be a touch screen chip, including single-way touch, multi-way touch, touch screen, etc. The touch sliding screen chip includes a switch area and a sliding area. The touch sliding screen chip generates a switch touch signal through the switch area, and generates a corresponding wind speed adjustment control signal when a sliding parameter is detected through the sliding area.

[0100] Among them, the touch module 111 of the portable fan uses a touch screen chip, which includes a switch area and a sliding area. When the user touches the switch area, the touch screen chip will detect the touch action and generate a switch signal. When the user slides in the sliding area, the touch screen chip will detect the sliding parameter and generate a corresponding wind speed adjustment control signal. The touch module 111 sends the generated switch signal and wind speed adjustment control signal to the control module 102. After receiving the switch signal, the control module 102 generates a switch control signal, which controls the switch tube of each bridge arm through this signal to start or stop the motor. After receiving the wind speed adjustment control signal, the control module 102 generates a PWM control signal, which controls at least one switch tube of each bridge arm through this signal to adjust the speed of the high-speed three-phase motor 104 to achieve wind speed regulation.

[0101] As an example, as shown in FIG5 , pins 5 to 9 of the touch screen connector P2 are connected to the touch screen, and pins 12 to 15 of the touch screen connector P2 can be connected to the control module 102 using the above connection method. As shown in FIG6 , a control interface is displayed on the mobile terminal screen. The control interface includes a power button, a speed adjustment button, a timer off button, an air purification button, an ambient light button, and a fan abnormality reminder. Different functions are achieved by clicking the buttons. This is only an example and does not limit the present application.

[0102] The technical effect of this embodiment is that through the touch screen chip, the user can easily realize the switch control and wind speed adjustment of the fan. The operation is simple and intuitive, meeting the user's various needs. The touch screen chip can realize flexible switching and wind speed adjustment through the detection of the switch area and the sliding area. The user can accurately control the wind speed of the fan according to needs, providing a more comfortable use experience. The use of the touch screen enhances the technological and modern sense of the portable fan, improves the user experience, and makes the product more competitive in the market.

[0103] As a third embodiment of the touch module 111, the touch module 111 includes multiple single-contact touch chips connected in parallel. The touch module 111 generates a switch touch signal when it detects a touch action through any one contact, and generates a corresponding wind speed adjustment control signal when it detects sliding parameters through multiple contacts.

[0104] The touch control module 111 of the portable fan includes multiple single-touch touch chips or a multi-touch integrated chip. When a user touches any single-touch touch chip, the chip generates a switch signal. When a user slides on the touch screen, the multiple single-touch touch chips detect the sliding parameters and generate corresponding wind speed adjustment control signals. The touch control module 111 sends the generated switch touch signal and wind speed adjustment control signal to the control module 102. After receiving the switch touch signal, the control module 102 generates a conduction level signal, which controls the switch tube of each bridge arm to start or stop the motor. After receiving the wind speed adjustment control signal, the control module 102 generates a PWM control signal, which controls at least one switch tube of each bridge arm to adjust the speed of the high-speed three-phase motor 104 and achieve wind speed regulation.

[0105] As an example, as shown in Figure 7, U3 is a single-contact touch chip. The single-contact touch chip U3 is connected to the control module 102 through pin 1 via resistor R10. Pin 3 of the single-contact touch chip U3 is connected to a contact K1 through resistor R11. The above function can be achieved by connecting multiple single-contact touch chips in parallel.

[0106] The technical benefit of this embodiment is that, through multiple parallel single-touch touch chips, users can easily control the fan's on / off function and adjust its wind speed. This simple and intuitive operation meets multiple user needs. The touch-slide adjustment chip, through detection of multiple single contacts, enables flexible wind speed adjustment, allowing users to precisely control the fan's wind speed as needed, providing a more comfortable user experience. The use of a touch screen enhances the portable fan's technological and modern feel, improving the user experience and making the product more competitive in the market.

[0107] As an embodiment, as shown in Figure 8, when the input module 101 is a voice module 112, the voice module 112 captures the user's voice signal and converts the voice signal into a switch signal and a wind speed adjustment control signal, and the control module 102 generates a switch control signal and a PWM control signal according to the switch signal and the wind speed adjustment control signal respectively.

[0108] The user issues a voice command through voice module 112, such as "turn on the fan," "turn off the fan," or "increase the fan speed." The microphone in voice module 112 captures the user's voice signal. Voice module 112 transmits the captured voice signal to the voice recognition unit, which converts the voice signal into a corresponding switch signal and wind speed adjustment control signal. Voice module 112 then sends the switch signal and wind speed adjustment control signal to control module 102. Control module 102 generates corresponding control signals based on the switch signal and wind speed adjustment control signal. If the command is "turn on the fan" or "turn off the fan," the command corresponds to the switch signal, and control module 102 generates the switch control signal. If the command involves wind speed adjustment ("increase the fan speed"), the command corresponds to the wind speed adjustment control signal, and control module 102 generates a PWM control signal. Control module 102 uses the switch control signal to control the switch in driver module 103, driving the high-speed three-phase motor 104 to start or stop. Control module 102 adjusts the duty cycle of the PWM signal based on the wind speed adjustment control signal to generate the corresponding PWM control signal. The control module 102 sends a PWM control signal to the driving module 103 , and controls the speed of the high-speed three-phase motor 104 by adjusting the switching frequency and duty cycle of the upper bridge arm or lower bridge arm switch tube.

[0109] The technical effect of this embodiment is that the user does not need to manually operate the mechanical switch or touch panel, and can conveniently control the portable fan through voice commands, which is more convenient to operate. The motor speed is controlled by PWM signal, ensuring the smoothness and accuracy of wind speed adjustment, so that users can get a better user experience.

[0110] As for the voice module 112, as an implementation mode, as shown in FIG9 , the voice module 112 includes a voice acquisition module 121, a voice recognition module 122 and a voice output module 123. The voice recognition module 122 is respectively connected to the voice acquisition module 121, the voice output module 123 and the control module 102. The voice acquisition module 121 captures the user's voice signal, the voice recognition module 122 converts the voice signal into a switch signal and a wind speed adjustment control signal and sends it to the control module 102. The voice recognition module 122 also controls the voice output module 123 to output or not output the execution result according to the feedback result of the control module 102.

[0111] Among them, the voice acquisition module 121 is responsible for capturing the user's voice signal and is usually composed of a microphone, which is used to convert the user's voice input into an electrical signal form. The voice recognition module 122 converts the captured voice signal into a switch signal and a wind speed adjustment control signal. Using voice recognition algorithms and techniques, the voice signal is processed into recognizable signal instructions. These instructions can be parsed and executed by the subsequent control module 102. Specifically, the voice recognition module 122 preprocesses the captured voice signal, including signal amplification, filtering, and denoising, to ensure the accuracy and stability of subsequent processing. The preprocessed voice signal is converted into a digital feature vector. This step can use technologies such as MFCC (Mel Frequency Cepstral Coefficients) to extract features from the voice signal. Based on a large amount of labeled voice data, the voice recognition model is trained. Commonly used technologies include hidden Markov models (HMMs), deep learning models (such as recurrent neural networks (RNNs) and long short-term memory networks (LSTMs), etc. The feature vectors are input into the voice recognition model for recognition and decoding. The model maps the feature vector sequence into an instruction sequence. The decoded instructions are output. The voice type can be to indicate whether the fan is turned on or off, for example: turning on the fan corresponds to 0x01, and turning off the fan corresponds to 0x02. The voice type can be to indicate the speed adjustment of the fan, for example: increasing the wind speed corresponds to 0x03, and reducing the wind speed corresponds to 0x04. The voice type 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, and high speed corresponds to 0x12. In addition, other text can 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 instruction 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 it to the second level wind speed).

[0112] For example, if a user says "turn on the fan," the voice module 112 recognizes the command and generates a signal 0x01, which is then sent to the control module 102. If a user says "increase the fan speed," the voice module 112 recognizes the command and generates a signal 0x03, which is then sent to the control module 102. If a user says "adjust the fan speed to medium," the voice module 112 recognizes the command and generates a signal 0x11, which is then sent to the control module 102.

[0113] As an example, as shown in Figures 10 and 11, the voice collection module 121 includes a microphone MIC, a resistor R23, a resistor R24, a capacitor C27, and a capacitor C28. The first end of the microphone MIC is respectively connected to the second end of the resistor R24 ​​and the second end of the capacitor R27, and the second end of the microphone MIC is respectively connected to the second end of the resistor R23 and the second end of the capacitor R28. The voice recognition module 122 includes a voice recognition chip U1, pin 1 of the voice recognition chip U1 is connected to one end of the capacitor C21, pin 2 of the voice recognition chip U1 is respectively connected to one end of the capacitor C20 and one end of the resistor R20, the other end of the capacitor C20 and the anode of the voltage regulator D1 are connected to the ground, the other end of the resistor R20 and the cathode of the voltage regulator D1 are connected to a high level, pin 3 of the voice recognition chip U1 is connected to one end of the capacitor C24, and pin 4 of the voice recognition chip U1 is connected to one end of the capacitor C25. Pin 5 of the voice recognition chip U1 and the other end of capacitor C24 and the other end of capacitor C25 are connected to the ground. Pin 24 of the voice recognition chip U1 and one end of capacitor C22, one end of capacitor C23, and the other end of capacitor C21 are connected to the same potential. Pin 23 of the voice recognition chip U1 is connected to the other end of capacitor C22. Pin 22 of the voice recognition chip U1 is connected to the other end of capacitor C23. Pins 22, 21, and 20 of the voice recognition chip U1 are connected to A1, A2, and A3 of the voice acquisition module 121, respectively.

[0114] The working process of this circuit is as follows: microphone MIC collects the user's voice input, capacitors C27 and C28 convert the user's voice input into an electrical signal and output it to the voice recognition chip U1, and the voice recognition chip U1 converts the captured voice signal into a switch signal and a wind speed adjustment control signal.

[0115] The technical effect of this embodiment is that through voice input and output, the user interactivity and friendliness of the device are improved, allowing users to easily control the start and stop and speed adjustment of the fan through voice commands without directly contacting the device. Voice control enables the fan to have more functions, such as intelligent operation and customized voice settings according to user voice commands, enhancing the intelligence of the device and user experience.

[0116] As for the voice output module 123 , as an implementation, as shown in FIG12 , the voice output module 123 includes a power amplifier module 1131 and a speaker 1132 , and the power amplifier module 1131 is connected to the voice recognition module 122 and the speaker 1132 , respectively.

[0117] Among them, the power amplifier module 1131 is mainly responsible for amplifying the voice signal, and amplifies the low-level voice signal output from the voice recognition module 122 to a high-level signal sufficient to drive the speaker 1132. The speaker 1132 receives the voice signal amplified by the power amplifier module 1131 and converts it into sound output.

[0118] As an example, as shown in Figure 13, the voice output module 123 includes an amplifier chip U2 and a speaker S1. The B1 and B2 ends of the amplifier chip U2 are respectively connected to pins 16 and 17 of the voice recognition chip U1. The amplifier chip U2 is responsible for amplifying the voice signal and outputting the voice from the speaker S1.

[0119] The technical effect of this embodiment is that: through the power amplifier module, it can be ensured that the voice signal will not be lost or deformed during the transmission process, and the speaker can be driven with sufficient volume so that the user can clearly hear the voice output result.

[0120] As an embodiment, as shown in Figure 14, the portable fan also includes a networking module 106, which is respectively connected to the voice module 112 and the control module 102; the voice module 112 uploads the voice signal to the cloud server 107 through the networking module 106, and the cloud server 107 converts the voice signal into a switch signal and a wind speed adjustment control signal and outputs it to the networking module 106, and the networking module 106 sends the switch signal and the wind speed adjustment control signal to the control module 102.

[0121] The system's recognition accuracy and flexibility can be further enhanced by utilizing the voice recognition service and remote control capabilities of the cloud server 107 through networking. The specific steps are as follows: a microphone is used to capture the user's voice signal, which is then transmitted to the networking module 106 through analog-to-digital conversion. The networking module 106 then uploads the captured voice signal to the cloud server 107 for voice recognition. The cloud server 107 converts the voice signal into a switch signal and a wind speed adjustment control signal, which are then returned to the networking module 106. The networking module 106 transmits the switch signal and wind speed adjustment control signal returned from the cloud to the control module 102, which generates the corresponding control signal. The control module 102 responds to voice commands, such as "turn on the fan" or "turn off the fan," or can customize other switch commands to increase user convenience and enjoyment. For example, possible customized switch commands include "turn on the fan," "turn off the fan," "start blowing," "I'm hot, turn on the fan," and so on. These commands can be further expanded based on user habits and preferences to enhance the interactive experience. The control module 102 generates a switch control signal based on the voice command, such as "increase fan speed" or "decrease fan speed," and calculates the corresponding PWM signal duty cycle based on the voice command, and generates a PWM control signal. The driver module 103 drives the motor based on the received switch control signal and PWM control signal, controlling the fan's on / off and fan speed.

[0122] The technical effects of this embodiment are: since voice recognition is performed on the cloud server, the cloud server has stronger computing power and more efficient voice recognition algorithm, which can more accurately recognize the user's voice commands and improve the recognition accuracy; the voice recognition task is completed in the cloud, which reduces the computing burden of the portable fan device, allowing the device to adopt a lower-cost hardware configuration while extending battery life; the addition of the networking module enables the portable fan to be linked with other smart devices to achieve remote control and data analysis, further improving the user experience and the intelligence of the device.

[0123] As an embodiment, as shown in Figure 15, the portable fan also includes a speed measurement module 105, which is respectively connected to the high-speed three-phase motor 104 and the control module 102; the speed measurement module 105 is used to measure the actual speed of the high-speed three-phase motor 104 and send it to the control module 102, and the control module 102 obtains the speed change according to the actual speed and the target speed, and adjusts the PWM signal duty cycle according to the speed change, and outputs the adjusted PWM control signal to the drive module 103.

[0124] In this embodiment, an incremental PID control algorithm is specifically used to generate a PWM signal to improve the smoothness of the PWM signal and the accuracy of motor speed regulation. This can be achieved through the following steps: The incremental PID control algorithm calculates the current and previous errors and adjusts the control variable to achieve precise control of the system. It includes three parts: proportional (P), integral (I), and differential (D): proportional control (P): proportional adjustment of the current error; integral control (I): cumulative adjustment of past errors; and differential control (D): rate of change adjustment of the current error. The PWM module and timer are initialized, and the parameters required by the PID control algorithm (proportional coefficient Kp, integral coefficient Ki, differential coefficient Kd) are set. Sensor data is acquired. The speed measurement module 105, which can be a magnetic encoder or Hall sensor, measures the motor speed in real time and feeds it back to the control module 102. The control module 102 calculates the current error based on the set target speed and the actual measured speed, calculates the incremental control variable based on the current error, adjusts the PWM duty cycle, and outputs a PWM signal to control the speed of the high-speed three-phase motor 104.

[0125] The technical effect of this embodiment is that the PID control algorithm adjusts the control quantity according to the error, can accurately track the set value, and quickly stabilize the motor speed near the target value. The PID control algorithm responds quickly to error changes and can adjust the PWM signal in time when the load changes, ensuring the flexibility and accuracy of wind speed regulation. The PID control algorithm can also accurately adjust the PWM control signal to ensure a smooth transition of the wind speed.

[0126] As an implementation manner, when the control module 102 detects that the operating voltage changes, it keeps the operating voltage within a constant voltage range by boosting or reducing the voltage.

[0127] When the control module 102 detects that the operating voltage has changed, in order to maintain the stability of the motor operation, the control module can adjust the operating voltage to a preset constant voltage range through a boost or buck circuit. The control module 102 continuously monitors the input voltage, and when it detects that the voltage deviates from the preset range (such as 6-8.4V), it triggers the voltage regulation mechanism. The control module 102 controls a boost or buck converter. For example, when the input voltage is lower than the set range, the control module 102 enables the boost circuit to increase the voltage to within the set range. Conversely, when the input voltage is higher than the set range, the control module 102 enables the buck circuit to reduce the voltage to within the set range. Through the feedback loop, the control module 102 can adjust the degree of boost or buck in real time to ensure that the output voltage is constant within the preset range.

[0128] As an implementation manner, when the control module 102 detects that the operating current changes, it keeps the operating current within a constant current range by adjusting the PWM control signal.

[0129] When the control module 102 detects a change in the operating current, it adjusts the PWM (pulse width modulation) control signal to keep the current within a constant range. The control module 102 continuously monitors the operating current of the motor. When it is detected that the current deviates from the preset range (such as 0.12-1A), the current regulation mechanism is triggered. The control module 102 changes the input power of the motor by adjusting the duty cycle of the PWM signal. For example, when it is detected that the current is lower than the preset range, the PWM duty cycle is increased, the input power is increased, and the current is increased. Conversely, when the current is higher than the preset range, the PWM duty cycle is reduced, the input power is reduced, and the current is reduced. Through feedback from the current sensor, the control module 102 adjusts the duty cycle of the PWM signal in real time to ensure that the operating current remains within a constant range.

[0130] As an implementation manner, when the control module 102 detects that the operating power has changed, it keeps the operating power stable by adjusting the operating voltage or the operating current.

[0131] The control module 102 continuously monitors the operating power of the motor (P=V×I) and triggers the power regulation mechanism when it detects that the power deviates from the set value. By controlling the step-up or step-down 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 control signal feedback, the control module 102 adjusts the voltage or current in real time to ensure that the operating power remains within a constant range.

[0132] In the above embodiment, the control module monitors the operating 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, thereby improving the efficiency and performance of the motor and ensuring the reliability and stability of the portable fan in different environments.

[0133] For the driving module 103, as an embodiment, as shown in Figures 16 and 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, and 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.

[0134] The first bridge arm includes a first upper-arm switching transistor 301 and a second lower-arm switching transistor 302, with their midpoint connected to a first coil 311. The second bridge arm includes a third upper-arm switching transistor 303 and a fourth lower-arm switching transistor 304, with their midpoint connected to a second coil 312. The third bridge arm includes a fifth upper-arm switching transistor 305 and a sixth lower-arm switching transistor 306, with their midpoint connected to a third coil 313. Six loops are formed in total, each consisting of a switching transistor and a coil. The control module 102 uses a switching control signal to control each loop to turn on one by one, thereby driving the motor to begin operation. The control module 102 generates a switching control signal based on the received switching signal. The switching control signal is used to control the switches in each loop individually. Specifically, the switches in each bridge arm are turned on one by one in response to the switching control signal, thereby driving each motor phase coil with current. As the switches in each bridge arm are gradually turned on, current flows through their respective phase coils, causing the motor to begin rotation. The gradual turning on of the six loops sequentially activates each motor phase in the fan, thereby starting the entire fan system. Specifically, the switch tube of each of the six circuits is turned on in sequence to make each circuit conductive. The first circuit to the sixth circuit are conductive in sequence, and the fan rotates forward. The sixth circuit to the first circuit are conductive in sequence, and the fan rotates reversely.

[0135] After receiving the wind speed adjustment control signal, the control module 102 generates a PWM control signal. For each loop, the PWM control signal is used to adjust its corresponding switch tube, thereby adjusting the speed of the motor.

[0136] As an implementation method, the control module further controls the on-time of the switch tube in each loop through a PWM control signal to adjust the speed of the motor.

[0137] The control module receives wind speed adjustment control signals from the touch control module or voice module. These signals contain user instructions for adjusting the fan speed. Based on the wind speed adjustment control signals, the control module 102 generates corresponding pulse width modulation (PWM) control signals. The duty cycle of the PWM signal (i.e., the ratio of the high-level duration to the total cycle) directly corresponds to the desired fan speed. The control module 102 applies the generated PWM control signals to the two switches in each loop. The specific operation is as follows: the switches in each loop switch on and off according to the duty cycle of the PWM signal. When the PWM signal is high, the switches are turned on; when the PWM signal is low, the switches are turned off. By adjusting the duty cycle of the PWM signal, the on-time of the switches in each loop is controlled, thereby adjusting the current flowing through the motor coils. The motor speed is proportional to the current intensity in the motor coils. By adjusting the on-time of the switches in each loop, the control module 102 can accurately control the current of the high-speed three-phase motor 104, thereby adjusting the speed of the high-speed three-phase motor 104. By gradually increasing or decreasing the duty cycle of the PWM signal, the fan speed can be accelerated or decelerated, thereby achieving the adjustment of the fan speed.

[0138] The technical effect of this embodiment is that the control module generates a corresponding PWM control signal based on the received wind speed adjustment control signal. The duty cycle of the PWM signal directly determines the conduction time of the switch tube in each circuit, thereby controlling the current of the motor coil. Therefore, the motor speed can be accurately adjusted by adjusting the duty cycle of the PWM signal.

[0139] As an embodiment, the portable fan also includes an energy feedback circuit, which is 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 operating. The back electromotive force generated by the motor deceleration is converted into electrical energy through the rectifier circuit and stored in the energy storage unit. The energy recovery circuit includes a rectifier circuit, an energy storage unit, and a control switch. After receiving the energy feedback signal, the control switch is turned on, converting the kinetic energy of the motor into electrical energy through the rectifier circuit and storing it in a supercapacitor or battery.

[0140] For example, a portable fan is running at high speed. The user uses the input module to reduce the wind speed or stop the fan. The control module detects the wind speed adjustment signal or switch signal, reduces the PWM signal duty cycle, and decelerates the motor. The control module generates an energy feedback signal to activate the energy recovery circuit. The back electromotive force generated when the motor decelerates is converted into electrical energy through the rectifier circuit, and the converted electrical energy is stored in a supercapacitor or battery. When the fan is restarted, 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.

[0141] The technical effects of this embodiment are: through energy recovery, kinetic energy can be converted into electrical energy storage when the fan slows down or stops, reducing energy waste; reducing dependence on external power supplies, extending battery life, and improving the endurance of portable fans; users can enjoy more stable and lasting wind speed adjustment during use, improving the overall user experience.

[0142] 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 respectively output switching signals and wind speed adjustment control signals according to user instructions, and the control module 102 generates switching control signals and PWM control signals according to the switching signals and wind speed adjustment control signals.

[0143] The technical effect of this embodiment is that the combination of the voice module and the touch module allows users to choose the most suitable operation method according to their own preferences, thereby increasing the intelligence of the product.

[0144] As an embodiment, the input module 101 includes a voice module 112 and a touch module 111. The voice module 112 and the touch module 111 are both connected to the control module 102. The voice module 112 turns on and off the touch module according to user instructions, and outputs a switch signal. The touch module 111 outputs a wind speed adjustment control signal. 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.

[0145] The user sends a command to turn the touch module on or off to the voice module 112 via voice commands, and the voice module 112 transmits these commands to the control module 102. The user sends a command to turn the fan on or off to the voice module 112 via voice commands, and the voice module 112 generates a switch signal based on the user's command 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). The touch module 111 generates a wind speed adjustment control signal based on the user's operation and transmits it to the control module 102. The control module 102 enables or disables the touch module 111 based on the command from the voice module 112. When the touch module 111 is disabled, all touch operations will not generate a wind speed adjustment control signal, thereby avoiding misoperation. After receiving the switch signal, the control module 102 generates a switch control signal for turning the fan on or off. 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 motor speed.

[0146] The technical effects of this embodiment are: the touch module is enabled or disabled through voice commands. The user can disable the touch module through voice when holding the fan, avoiding incorrect wind speed adjustment operations caused by accidental touch, thereby improving the user's operating experience and product safety; the switch signal generated by the voice module is processed by the control module to ensure that the fan's switch operation is accurate; when the touch module is enabled, it generates a wind speed adjustment control signal through the user's touch operation, and the control module generates a high-precision PWM control signal based on the signal to achieve precise adjustment of the fan speed to meet the user's personalized needs.

[0147] As an example, as shown in FIG18 , which is a circuit diagram of the driving module 103 , the driving module 103 includes a first driving sub-module, a second driving sub-module, and a third driving sub-module.

[0148] The first driver submodule includes a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q7, a capacitor C16, a capacitor C21, a capacitor C27, a resistor R20, a resistor R24, a resistor R25, and a resistor R26. The first end of the capacitor C16, the first end of the resistor R24, the source of the MOS transistor Q2, the first end of the capacitor C21, and the first end of the capacitor C27 are connected to a power supply. The second end of the capacitor C16 is connected to the second end of the resistor R24, the drain of the MOS transistor Q1, and the gate of the MOS transistor Q2. The gate of the MOS transistor Q1 is connected to the first end of the resistor R20 and the first control signal terminal U_H, respectively. The source of the MOS transistor Q1 and the second end of the resistor R20 are commonly grounded. The drain of the MOS transistor Q2 is connected to the drain of the MOS transistor Q7 and the first end of the first coil, respectively. The gate of the MOS transistor Q7 is connected to the first end of the resistor R25 and the second control signal terminal U_L, respectively. The source of the MOS transistor Q7 is connected to the second end of the resistor R25 and the first end of the resistor R26, respectively. The second end of the capacitor C21 and the second end of the capacitor C27 are commonly grounded.

[0149] The second driver submodule includes a MOS transistor Q3, a MOS transistor Q4, a MOS transistor Q8, a capacitor C26, a capacitor C25, a resistor R32, a resistor R34, a resistor R35, and a resistor R38. A first end of capacitor C26, a first end of resistor R34, a source of MOS transistor Q4, and a first end of capacitor C25 are commonly connected to a power supply. A second end of capacitor C26 is respectively connected to the second end of resistor R34, the drain of MOS transistor Q3, and the gate of MOS transistor Q4. The gate of MOS transistor Q3 is connected to the first end of resistor R32 and the third control signal terminal V_H. The source of MOS transistor Q3 and the second end of resistor R32 are commonly grounded. The drain of MOS transistor Q4 is respectively connected to the drain of MOS transistor Q8 and the first end of the second coil. The gate of MOS transistor Q8 is respectively connected to the first end of resistor R35 and the fourth control signal terminal V_L. The source of MOS transistor Q8 is respectively connected to the second end of resistor R35 and the first end of resistor R38. The second end of capacitor C25 is connected to ground.

[0150] The third driving submodule includes a MOS transistor Q5, a MOS transistor Q6, a MOS transistor Q9, a capacitor C32, a capacitor C35, a resistor R42, a resistor R46, a resistor R49 and a resistor R51. The first end of the capacitor C32, the first end of the resistor R46, the source of the MOS transistor Q6 and the first end of the capacitor C35 are connected to a power supply. The second end of the capacitor C32 is connected to the second end of the resistor R46, the drain of the MOS transistor Q5 and the gate of the MOS transistor Q6 respectively. The gate of the MOS transistor Q5 is connected to the first end of the resistor R42 and the drain of the MOS transistor Q6. The fifth control signal terminal W_H, the source of the MOS transistor Q5, and the second end of the resistor R42 are commonly connected to ground. The drain of the MOS transistor Q6 is respectively connected to the drain of the MOS transistor Q9 and the first end of the third coil. The gate of the MOS transistor Q9 is respectively connected to the first end of the resistor R49 and the sixth control signal terminal W_L. The source of the MOS transistor Q9 is respectively connected to the second end of the resistor R49 and the first end of the resistor R51. The second end of the capacitor C25 is connected to ground. The second end of the resistor R26, the second end of the resistor R38, and the second end of the resistor R51 are commonly connected to ground.

[0151] Among them, the power supply, MOS transistor Q2, the first coil, the second coil, MOS transistor Q8 and resistor R38 form a first loop; the power supply, MOS transistor Q2, the first coil, the third coil, MOS transistor Q9 and resistor R51 form a second loop; the power supply, MOS transistor Q4, the second coil, the third coil, MOS transistor Q9 and resistor R51 form a third loop; the power supply, MOS transistor Q4, the second coil, the first coil, MOS transistor Q7 and resistor R26 form a fourth loop; the power supply, MOS transistor Q6, the third coil, the first coil, MOS transistor Q7 and resistor R26 form a fifth loop; the fifth upper arm switch transistor, the third coil, the second coil, MOS transistor Q8 and resistor R38 form a sixth loop.

[0152] Among them, the MOS transistors Q2, MOS transistors Q4, and MOS transistors Q6 can be NMOS transistors or PMOS transistors. The half-bridge driving mode of the MOS transistors Q2, MOS transistors Q4, and MOS transistors Q6 can adopt the driving mode in the circuit diagram as well as other driving modes, such as capacitor energy storage driving, transformer coupling driving, optical coupling driving, etc.

[0153] The control module 102 inputs switch control signals to the two switching transistors in each circuit via the first through sixth control signal terminals. The control module 102 uses the switch control signals to control the first through sixth circuits to conduct one after another in a preset sequence, thereby driving the motor to begin operation. The control module 102 inputs PWM control signals to the two switching transistors in each circuit via the first through sixth control signal terminals. The duty cycle of the PWM control signals controls the conduction current of each circuit to adjust the motor speed.

[0154] As an implementation method, as shown in Figure 19, in this implementation method, the two switching 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, and MOS tube Q6 and MOS tube Q9 are integrated into chip S3. The integrated switching tubes can significantly reduce the occupied space on the circuit board, making the driving circuit more compact. The use of integrated switching tube modules simplifies circuit design and layout, and reduces wiring complexity.

[0155] As an embodiment, as shown in 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, which are respectively connected to the control module 102, and the portable fan also includes a misting module 203, a cooling module 204, a heating module 205, a lighting module 206 and a shaking head module 207, which are respectively connected to the control module 102.

[0156] The manual switch module 201 may be a key switch or an encoder, the touch module 111 may be a touch key, a sliding resistor, a touch sliding module or a touch screen module, and the wireless module 202 may be a mobile control module, a Bluetooth control module or a wireless control module;

[0157] Among them, the push-button switch allows manual fan control, turning the fan on and off, or adjusting its speed, by pressing a button. The encoder is used to adjust the fan speed; rotating the encoder changes the fan speed setting. The touch button uses touch sensing to control the fan's on and off and wind speed. The sliding resistor allows the fan to be adjusted by sliding the resistor value, providing continuous wind speed adjustment. The touch-slide module adjusts the wind speed through sliding gestures, detecting sliding parameters such as speed, direction, and position to control the wind speed. The touch screen module provides a graphical interface, allowing the control of various functions such as turning the fan on and off, adjusting the wind speed, and setting the timer through the touch screen. The voice control module allows the fan to be turned on and off, and the wind speed to be adjusted, through voice commands, enhancing the intelligent control experience. The networked voice control module connects to the internet and uploads voice commands to a cloud server for processing, enabling remote voice control. The networked module enables remote control via the internet, allowing various fan functions to be remotely controlled via a mobile phone or other device. The mobile control module allows the control of various fan functions, including turning the fan on and off, adjusting the wind speed, and setting the timer, via a mobile device (such as a mobile phone or tablet). The Bluetooth control module can connect to a mobile device via Bluetooth to achieve short-range wireless control of the fan. The wireless control module can realize remote control and management of the fan through wireless signals (such as Wi-Fi). The atomization module 203 can provide a humidification function, and make the wind blown out by the fan cooler and more moist by atomizing water. The refrigeration module 204 can provide a refrigeration function, and reduce the outlet air temperature through the internal refrigeration element to improve the cooling effect. The heating module 205 can provide a heating function, and make the wind blown out by the fan warm through the internal heating element, which is suitable for cold seasons. The lighting module 206 can provide a lighting function, integrate LED lights or other light sources, and provide night lighting or decorative lighting effects. The shaking head module 207 can provide an automatic shaking head function, so that the fan can swing left and right, increase the wind coverage, and improve comfort.

[0158] The technical effect of this embodiment is that the portable fan not only provides diversified control methods and intelligent functions, but also significantly improves the user's comfort experience and operational convenience, meeting various needs in different usage scenarios.

[0159] It should be noted that all input, output and control functions of a portable fan can be integrated into a single chip or integrated circuit. This integration can simplify the design and manufacturing process of the system, reduce the number of components and space occupation, and may also reduce costs and power consumption.

[0160] The portable fan based on a high-speed three-phase motor provided in the first embodiment includes at least a handheld fan for handheld use, a desktop fan for portability and tabletop use, or a neck-hanging fan for neck use. The structure of the portable fan includes but is not limited to the following embodiments:

[0161] As an embodiment, this embodiment provides a portable fan based on a high-speed three-phase motor, which can be used as a handheld fan. As shown in FIG21 , which is an exploded view of the portable fan, the portable fan includes:

[0162] Handle left shell 81, handle right shell 82, air outlet front shell 83, middle shell 84, air outlet 85, button 86, wave switch button 87, hanging wire groove 88, shock-absorbing silicone 89, shock-absorbing silicone 90, air inlet net 91, light-shielding foam 92, battery foam 93, silicone gasket 94, motor assembly 95, screw 96, screw 97, battery 98 and PCB 99.

[0163] As an embodiment, this embodiment provides a portable fan based on a high-speed three-phase motor, which can be used as a neck-hanging fan. As shown in FIG22 , which is an exploded view of the portable fan, the portable fan includes:

[0164] Front shell decoration 401, flat connecting plate assembly 402, ball bearing 403, front shell 404, air duct 405, middle shell 406, fan motor 407, spring 408, fan blade 409, screw 410, rear shell 411, rear shell decoration 412, screw cover 413, screw 414, roller assembly 415, button decoration 416, safety supervision office fixing bracket 417, roller switch small plate 418, screw 419, wave switch small plate 420, mainboard fixing bracket 421, wave switch 422, handle bracket 423, battery pack 424, handle 425, handle decoration 426, lanyard bracket 427, screw 428 and snap ring 429.

[0165] As an embodiment, this embodiment provides a portable fan based on a high-speed three-phase motor, which can be used as a portable desktop fan that can be placed on a desktop. As shown in Figures 23 to 25, which are exploded views of the portable fan, the portable fan includes:

[0166] Screen casing 1, screen front casing 2, character light-transmitting patch 3, screen light-transmitting bracket 4, digital screen PCB 5, self-tapping screws 6, screen back casing 7, screws 8, shock-absorbing silicone ring 9, shock-absorbing EVA 10, fan motor bracket 11, motor 12, snap ring 13, gasket 14, fan bearing 15, motherboard, digital screen PCB connecting line 16, fan spring 17, magnetic ring assembly 18, fan blade 19, fan blade housing 20, light guide ring 21, light strip 22, fan head bracket 23, lower screw hole cover 24, upper screw hole cover 25, air duct part 26, housing 27, filter element with foam at both ends 28, air filter element 29, filter element bracket 30, back cover 31, copper nut 32, countersunk machine screw 33, housing wire snap ring 34, wire pressure cover 35, base Wire clamp 36, shaft 37, air duct wire cover 38, left shaft plug 39, right shaft plug 40, wire shielding cover 41, aluminum alloy bracket 42, machine screw 43, base upper shell 44, self-tapping screw 45, stepper motor 46, stepper motor bracket 47, steel ball 48, steel ball bracket 49, steel ball lower bracket 50, large gear 51, small gear 52, clutch gear 53, stepper motor bearing 54, battery EVA 55, spring 56, buckle 57, round button 58, round button silicone 59, light button silicone 60, light button 61, knob 62, button plate 63, self-tapping screw 64, charging board 65, charging board bracket 66, base lower shell 67, battery pack 68, battery EVA 69, base bottom shell 70, label 71 and foot pad 72.

[0167] As an embodiment, this embodiment provides a portable fan based on a high-speed three-phase motor, which can be used as a neck hanging fan. As shown in FIG27 , which is an exploded view of the portable fan, the portable fan includes:

[0168] Neck support 5 , air inlet 11 , air outlet 14 and clamping arm 15 .

[0169] Example 2

[0170] This embodiment provides a control method for a portable fan provided in the embodiment, as shown in FIG26 , the control method includes:

[0171] Step S101 . Control the operating voltage of the high-speed three-phase motor to 2 to 18 volts, control the operating current of the high-speed three-phase motor to 0.1 to 10 amps, and / or control the rated operating power of the high-speed three-phase motor to 0.5 to 100 watts.

[0172] Step S102: Control the rated operating speed of the high-speed three-phase motor through the driving module according to the operating voltage, operating current and / or rated operating power to reduce the high-speed noise of the high-speed three-phase motor and control the wind speed to be within a preset wind speed range.

[0173] The control method also includes:

[0174] Step S111. Obtaining a wind speed adjustment control signal;

[0175] Step S112: converting the wind speed adjustment control signal into a PWM control signal;

[0176] Step S113: Control the switch tube of each bridge arm through the PWM control signal to adjust the speed of the motor.

[0177] The control method also includes:

[0178] Step S201: Obtain a switch signal.

[0179] Step S202: Convert the switch signal into a switch control signal.

[0180] Step S203: Control the switch tube of each bridge arm through the switch control signal to drive the motor to start or stop running.

[0181] Among them, the switch signal and wind speed adjustment control signal are control signals generated according to user instructions. The touch signal and adjustment signal generated by the user through touch or other means can be directly converted into switch control and PWM control signals. The switch signal can be the user's switch operation, such as a command to turn on or off the fan; the wind speed adjustment control signal is used to adjust the fan speed, which is usually generated by the user's manual operation or other control methods.

[0182] The switching signal is processed and converted into a switch control signal that controls the bridge arm switches, which is used to start or stop the motor. The wind speed control signal is processed to calculate the duty cycle of the corresponding PWM (pulse width modulation) control signal. The PWM control signal is used to adjust the motor speed by adjusting the on-time of each bridge arm switch.

[0183] Based on the switch control signal, the driver module turns the switch in each bridge arm on or off, starting or stopping the motor. Simultaneously, based on the calculated PWM control signal, the driver module adjusts the duty cycle and duty cycle of each bridge arm switch to control the motor's speed and power output.

[0184] As an implementation mode, when the input module is a touch control module, converting the wind speed adjustment control signal into a PWM control signal includes:

[0185] The duty cycle of the PWM signal is calculated according to the wind speed adjustment control signal, and a PWM control signal is generated according to the duty cycle of the PWM signal.

[0186] As an implementation manner, when the input module is a voice module, the voice module captures the user's voice signal and converts the voice signal into a switch signal and a wind speed adjustment control signal.

[0187] The above two implementation modes can be specifically described in Example 1 and will not be described in detail here.

[0188] Example 3

[0189] As shown in Figure 29 of the specification:

[0190] A motor drive control circuit for a portable fan includes: a battery power supply, a voltage stabilizing unit 100, a main control unit 200, a motor drive control unit 300, a motor drive circuit 400, a motor 500, a rotor position detection circuit 600, a USB access circuit 700, an ADC (Analog-to-Digital Converter) power supply circuit 800, and a display unit 900.

[0191] Portable fans include: handheld fans, neck fans, wearable fans, waist-mounted fans, neck fans, head-mounted fans, desktop fans, car-mounted fans, etc.

[0192] As shown in Figure 30 of the specification:

[0193] The voltage stabilizing unit 100 includes a voltage stabilizing chip U1, and the power supply voltage VBAT is connected to the IN input pin of the voltage stabilizing chip U1 through a current limiting resistor R1; one end of the filter capacitor C1 is connected to the IN input pin 1 of the voltage stabilizing chip U1, and the other end is grounded; the OUT output pin of the voltage stabilizing chip U1 outputs the VDD working voltage to power the main control chip U2 and the motor drive chip U3; the OUT output pin of the voltage stabilizing chip U1 is grounded through a capacitor C2 to filter the current; the GND pin of the voltage stabilizing chip U1 is grounded.

[0194] The voltage stabilization unit 100 is used to stabilize the power supply voltage and ensure a constant output voltage under different load conditions. It automatically adjusts the current according to changes in the power supply voltage to maintain a constant output voltage. The voltage stabilization unit 100 is used to stabilize a voltage source with large fluctuations to prevent external environmental factors (such as temperature and humidity) from affecting the circuit.

[0195] As shown in Figure 31 of the specification:

[0196] In one embodiment, the motor drive control unit 300 , the motor drive circuit 400 , and the rotor position detection circuit 600 work together to drive the motor 500 .

[0197] The permanent magnets are arranged on the rotor of the motor 500 , and the three windings U2 , V2 , and W2 are arranged on the stator of the motor 500 in a Y-type connection.

[0198] The motor drive control unit 300 outputs a control signal, and the motor drive circuit 400 controls the magnitude, direction, and phase relationship of the current flowing through the U2 , V2 , and W2 phase windings of the motor 500 according to the control signal.

[0199] The motor driving circuit 400 includes capacitors C3, C4, and C5 connected in parallel, one end of which is connected to the power supply voltage VBAT and the other end is grounded to filter current and stabilize voltage.

[0200] In one embodiment, the motor drive circuit 400 further includes: a MOS switch Q1 connected to the power supply voltage VBAT at one end and to the winding U2 at the other end. The conduction of the MOS switch Q1 is controlled by the MOS switch Q4. The MOS switch Q4 has one end connected to the power supply voltage VBAT via a voltage-divider current-limiting resistor R5 and the other end connected to ground. The motor drive control unit 300 outputs a PWM_AH signal to the drain of the MOS switch Q4 to control the conduction of the MOS switch Q4. A MOS switch Q7 has one end connected to the winding U2 and the other end connected to ground via a resistor R11. The motor drive control unit 300 outputs a PWM_AL signal to the drain of the MOS switch Q7 to control the conduction of the MOS switch Q7. Reverse diodes are provided on the MOS switches Q1, Q4, and Q7. The diodes are reversely broken down before overvoltage damages the MOS transistors, preventing them from burning out.

[0201] Optionally, MOS switch Q1 is a P-type MOS transistor, and MOS switches Q4 and Q7 are N-type MOS transistors. Resistor R2 is connected to the drain and source of MOS switch Q4, and resistor R8 is connected to the drain and source of MOS switch Q7 to provide bias voltage for the field-effect transistors and discharge static electricity between the gate and source of the MOS transistors, thereby protecting the MOS transistors.

[0202] The current control principle of winding U2 is as follows:

[0203] Current flows into winding U2: the motor drive control unit 300 outputs a PWM_AL low-level signal to the drain of the MOS transistor switch Q7, and the MOS transistor switch Q7 is in the off state; the motor drive control unit 300 outputs a PWM_AH signal to the drain of the MOS transistor switch Q4. The MOS transistor switch Q4 is turned on, and the power supply voltage VBAT is grounded through the voltage-dividing current-limiting resistor R5. The drain of the MOS transistor switch Q1 is grounded and inputs a low level. The MOS transistor switch Q1 is turned on, and the current flows into winding U2.

[0204] Current flows out of winding U2: the motor drive control unit 300 outputs a PWM_AH low-level signal to the drain of the MOS switch Q4, and the MOS switch Q4 is in the off state. The drain of the MOS switch Q1 is connected to a high level, and the MOS switch Q1 is turned off; the motor drive control unit 300 outputs a PWM_AL signal to the drain of the MOS switch Q7, and the MOS switch Q7 is turned on, and current flows out of winding U2.

[0205] In one embodiment, a MOS switch circuit composed of MOS switches Q2, Q5, Q8 and resistors R6, R3, and R9 controls the inflow and outflow of current from winding V2. Its circuit structure and control principle are similar to those of the current control circuit of winding U2. A MOS switch circuit composed of MOS switches Q3, Q6, Q9 and resistors R7, R4, and R10 controls the inflow and outflow of current from winding W2. Its circuit structure and control principle are similar to those of the current control circuit of winding U2.

[0206] In one embodiment, the motor overcurrent protection circuit includes: a current sampling resistor R11 for monitoring the current flowing out of the motor 500; the voltage of the resistor R11 is output to the ISENSE_IN overcurrent protection detection pin of the motor drive control unit 300 through the current limiting resistor R12, and the motor drive control unit 300 converts the input voltage signal into a corresponding digital signal to obtain a quantized current value of the motor 500; one end of the capacitor C6 is connected to the ISENSE_IN overcurrent protection detection pin of the motor drive control unit 300, and the other end is grounded to filter the current and stabilize the voltage; when the current value of the motor 500 exceeds the maximum operating current, the motor drive control unit 300 adjusts the control signal output to the motor drive circuit 400 to reduce the current flowing through the windings U2, V2, and W2 of the motor 500.

[0207] As shown in Figure 32 of the specification:

[0208] In one embodiment, in the rotor position detection circuit 600, one end of the resistor R13 is connected to the BEMF_COM pin of the motor drive control unit 300, and the other end is grounded through the resistor R19; the winding U2 is connected to the BEMF_U pin of the motor drive control unit 300 through the resistor R14, and the other end of the resistor R14 is grounded through the resistor R19.

[0209] The BEMF back-electromotive force output circuit composed of resistors R15, R16, and R20 outputs the BEMF back-electromotive force voltage signal of winding V2. Its circuit structure and control principle are similar to those of the BEMF back-electromotive force output circuit of winding U2; the BEMF back-electromotive force output circuit composed of resistors R17, R18, and R21 outputs the BEMF back-electromotive force voltage signal of winding W2. Its circuit structure and control principle are similar to those of the BEMF back-electromotive force output circuit of winding U2.

[0210] The motor drive control unit 300 monitors the line voltages of the windings U2 , V2 , and W2 via the signals input from the BEMF_U, BEMF_V, and BEMF_W pins, and calculates the back electromotive force of the rotor of the motor 500 , thereby calculating the position of the rotor of the motor 500 .

[0211] The driving control principle of the motor 500 is as follows:

[0212] The main control unit 200 outputs a motor start signal to the input end of the motor drive control unit 300, and the motor drive control unit 300 outputs a motor drive signal to the gate of the MOS tube of the motor drive circuit 400; the motor drive control unit 300 obtains the current position of the motor 500 rotor through the back electromotive force, controls the phase relationship of each phase output, and energizes the corresponding two-phase winding each time. The energization time of each phase winding is 120 electrical degrees, so that the stator flux and the reverse direction are at a certain angle to the rotor flux, so as to drive the rotor of the motor 500 to rotate.

[0213] As shown in Figure 33 of the specification:

[0214] In one embodiment, the motor drive control unit 300 includes a motor drive chip U3, the VDD power supply pin 12 of the motor drive chip U3 is connected to the VDD operating voltage, and the capacitor C7 is connected to the VDD power supply pin 12 of the motor drive chip U3 to filter the current and stabilize the voltage; the GND pin 5 of the motor drive chip U3 is grounded; the PWM pin 11 of the motor drive chip U3 receives the motor operation pulse modulation signal PWM, and the pins 1-3 and 14-16 of the motor drive chip U3 output the motor drive signal to the gate of the MOS tube of the motor drive circuit 400; the pins 6-8 of the motor drive chip U3 receive the back electromotive force signals BEMF_U, BEMF_V, and BEMF_W; the FG pin 13 of the motor drive chip U3 outputs the motor speed information; the ISENSE_IN pin 9 of the motor drive chip U3 receives the overcurrent protection signal.

[0215] As shown in Figure 34 of the specification:

[0216] In one embodiment, the USB access circuit 700 includes: USB voltage VBUS outputs a USBDET signal through a current limiting resistor R22; the anode of the diode D2 is grounded, and the cathode is connected to the USB voltage VBUS through the resistor R22 to implement overvoltage protection of the main control unit.

[0217] In one embodiment, the battery voltage detection analog-to-digital conversion circuit 800 includes: a battery voltage VBAT is grounded through resistors R23 and R24, a capacitor C8 is connected in parallel with the resistor R24; and one end of the resistor R24 ​​outputs an analog-to-digital conversion voltage signal V_ADC.

[0218] In one embodiment, the motor drive control circuit of the portable fan is provided with an adapter interface P2, which transmits the P_EN enable signal and the gear adjustment signals KEY, KEY_X, and KEY_Y of the dip switch to the main control unit 200 of the portable fan, and the VDD power supply is supplied to the mode switching roller through the current limiting resistors R25 and R26.

[0219] In one embodiment, the display unit 900 includes: an SMG switch interface, a digital display screen, and the SMG switch adapter interface pins 1-5 are connected to the main control unit 200 through current limiting resistors R25-R29. The display control signal is received and transmitted to the digital display screen. The digital display screen displays the portable fan blowing temperature and fan power percentage according to the display control signal.

[0220] In one embodiment, the main control unit 200 includes a control chip U4, the VDD power supply pin 1 of the control chip U4 is connected to the VDD operating voltage, and the VDD power supply pin 1 of the control chip U4 is grounded through the voltage-stabilizing capacitor C9; the VSS pin 16 of the control chip U4 is grounded; pins 4, 6, and 7 of the control chip U4 receive the gear adjustment signals KEY, KEY_X, and KEY_Y and send the fan's operating status instructions; pin 5 of the control chip U4 outputs the motor operation pulse modulation signal PWM to the motor driver chip U3; pin 8 of the control chip U4 receives the USBDET signal to determine the power supply status; pin 9 of the control chip U4 receives the analog-to-digital conversion voltage signal V_ADC; pins 2, 12-15 of the control chip U4 are connected to the display unit 900 to output the display control signal.

[0221] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A portable fan based on a high-speed three-phase motor, characterized in that: include: A control module, a drive module and a high-speed three-phase motor, wherein the operating voltage of the high-speed three-phase motor is 2 to 18 volts, the operating current of the high-speed three-phase motor is 0.1 to 10 amps, and / or the rated operating power of the high-speed three-phase motor is 0.5 to 100 watts; The control module controls the rated operating speed of the high-speed three-phase motor through the driving module according to the operating voltage, the operating current and / or the rated operating power, so as to reduce the high-speed noise of the high-speed three-phase motor and control the wind speed within a preset wind speed range.

2. The portable fan according to claim 1, characterized in that When the working voltage of the high-speed three-phase motor is 6 to 8.4 volts, the working current of the high-speed three-phase motor is 0.12 to 1 ampere, and / or the rated working power of the high-speed three-phase motor is 0.8 to 9 watts, the control module controls the rated working speed of the high-speed three-phase motor to be 6000-15000 RPM / MIN through the driving module according to the working voltage, the working current and / or the rated working power; Alternatively, when the operating voltage of the high-speed three-phase motor is 5.9 to 8.4 volts, the operating current of the high-speed three-phase motor is 0.5 to 6 amperes, and / or the rated operating power of the high-speed three-phase motor is 5 to 50 watts, the control module controls the rated operating speed of the high-speed three-phase motor to be 20000-80000 RPM / MIN through the drive module according to the operating voltage, the operating current and / or the rated operating power; Alternatively, the operating voltage of the high-speed three-phase motor is 2 to 5.8 volts, the operating current of the high-speed three-phase motor is 0.25 to 2 amps, and / or the rated operating power of the high-speed three-phase motor is 1 to 8 watts, and the control module controls the rated operating speed of the high-speed three-phase motor to be 15000-41000 RPM / MIN through the drive module according to the operating voltage, the operating current and / or the rated operating power; Alternatively, when the operating voltage of the high-speed three-phase motor is 8.5 to 12.6 volts, the operating current of the high-speed three-phase motor is 0.5 to 5 amperes, and / or the rated operating power of the high-speed three-phase motor is 6 to 60 watts, the control module controls the rated operating speed of the high-speed three-phase motor to be 25000-85000 RPM / MIN through the drive module according to the operating voltage, the operating current and / or the rated operating power; Alternatively, when the operating voltage of the high-speed three-phase motor is 12 to 18 volts, the operating current of the high-speed three-phase motor is 0.1 to 1 ampere, and / or the rated operating power of the high-speed three-phase motor is 2 to 16 watts, the control module controls the rated operating speed of the high-speed three-phase motor to be 2000-6000 RPM / MIN through the drive module according to the operating voltage, the operating current and / or the rated operating power; Alternatively, the operating voltage of the high-speed three-phase motor is 3.7 volts or 4.3 volts, the operating current of the high-speed three-phase motor is 0.25 to 2 amps, and / or the rated operating power of the high-speed three-phase motor is 1 to 8 watts. The control module controls the rated operating speed of the high-speed three-phase motor to 15000-41000 RPM / MIN through the drive module according to the operating voltage, the operating current and / or the rated operating power.

3. The portable fan according to claim 1, characterized in that The portable fan further comprises an input module, the input module is connected to the control module, the driving module comprises a first bridge arm, a second bridge arm and a third bridge arm, the midpoint of each bridge arm comprises an upper bridge arm switch tube and a lower bridge arm switch tube on both sides, and the midpoint of each bridge arm is connected to a phase coil of the motor; The input module outputs a wind speed adjustment control signal according to a user instruction, the control module generates a PWM control signal according to the wind speed adjustment control signal, and controls the switch tube of each bridge arm through the PWM control signal to adjust the speed of the high-speed three-phase motor; And / or, the input module also outputs a switch signal according to a user instruction, the control module 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 high-speed three-phase motor to start or stop running.

4. The portable fan according to claim 3, characterized in that When the input module is a touch control module, the touch control module outputs a switch signal when detecting a touch action, and the control module generates a switch control signal according to the switch signal; The touch control module outputs a wind speed adjustment signal when the sliding parameter is detected, the control module calculates the PWM signal duty cycle according to the wind speed adjustment signal, and generates a PWM control signal according to the PWM signal duty cycle; Alternatively, when the input module is a voice module, the voice module captures the user's voice signal and converts the voice signal into a switch signal and a wind speed adjustment control signal.

5. The portable fan according to claim 4, characterized in that The touch control module is a touch sliding adjustment chip, which includes a plurality of contact points. The touch sliding adjustment chip generates a switch signal when a touch action is detected through the plurality of contact points, and generates a corresponding wind speed adjustment control signal when a sliding parameter is detected through the plurality of contact points. Alternatively, the touch control module is a touch screen chip, the touch screen chip includes a switch area and a sliding area, the touch screen chip generates a switch signal when detecting a touch action through the switch area, and generates a corresponding wind speed adjustment control signal when detecting a sliding parameter through the sliding area; Alternatively, the touch control module includes a plurality of single-contact touch chips, and the touch control module generates a switch signal when a touch action is detected through any one of the contacts, and generates a corresponding wind speed adjustment control signal when a sliding parameter is detected through a plurality of contacts; Alternatively, the voice module includes a voice collection module, a voice recognition module and a voice output module, and the voice recognition module is connected to the voice collection module, the voice output module and the control module respectively; The voice module captures the user's voice signal, the voice recognition module converts the voice signal into a switch signal and a wind speed adjustment control signal and sends it to the control module, and the voice recognition module also controls the voice output module to output or not output the execution result according to the feedback result of the control module. Alternatively, the portable fan further comprises a networking module, and the networking module is respectively connected to the voice module and the control module; The voice module uploads the voice signal to the cloud server through the networking module, the cloud server converts the voice signal into a switch signal and a wind speed adjustment control signal and outputs them to the networking module, and the networking module sends the switch signal and the wind speed adjustment control signal to the control module.

6. The portable fan according to claim 1, characterized in that The portable fan at least includes a handheld fan for handheld use, a desktop fan for portability and tabletop use, or a neck-hanging fan for neck hanging use.

7. The portable fan according to claim 1, characterized in that When the control module detects that the operating voltage changes, the operating voltage is kept within a constant voltage range by boosting or reducing the voltage; Alternatively, when the control module detects that the operating current changes, the control module keeps the operating current within a constant current range by adjusting the PWM control signal; Alternatively, when the control module detects that the operating power changes, the control module keeps the operating power stable by adjusting the operating voltage or the operating current; Alternatively, the portable fan further comprises a rotation speed measurement module, and the rotation speed measurement module is respectively connected to the motor and the control module; The speed measurement module is used to measure the actual speed of the motor and send it to the control module. The control module obtains the speed change according to the actual speed and the target speed, adjusts the PWM signal duty cycle according to the speed change, and outputs the adjusted PWM control signal to the drive module.

8. The portable fan according to claim 3, characterized in that The input module and the control module are connected by wire or wirelessly, and the input module is arranged on the housing of the portable fan or other electronic equipment; Alternatively, the input module includes a manual switch module, a touch module, a voice module, a networking module and a wireless module respectively connected to the control module, and the portable fan also includes an atomization module, a cooling module, a heating module, a lighting module and a shaking head module respectively connected to the control module.

9. The portable fan according to claim 3, characterized in that: The first bridge arm includes a first upper bridge arm switch tube and a second lower bridge arm switch tube, the second bridge arm includes a third upper bridge arm switch tube and a fourth lower bridge arm switch tube, the third bridge arm includes a fifth upper bridge arm switch tube and a sixth lower bridge arm switch tube, the midpoint of the first bridge arm is connected to the first coil, the midpoint of the second bridge arm is connected to the second coil, and the midpoint of the third bridge arm is connected to the third coil; The first upper bridge arm switch tube, the first coil, the second coil and the fourth lower bridge arm switch tube form a first loop; the first upper bridge arm switch tube, the first coil, the third coil and the sixth lower bridge arm switch tube form a second loop; the third upper bridge arm switch tube, the second coil, the third coil and the sixth lower bridge arm switch tube form a third loop; the third upper bridge arm switch tube, the second coil, the first coil and the second lower bridge arm switch tube form a fourth loop; the fifth upper bridge arm switch tube, the third coil, the first coil and the second lower bridge arm switch tube form a fifth loop; the fifth upper bridge arm switch tube, the third coil, the second coil and the fourth lower bridge arm switch tube form a sixth loop; The control module controls each circuit to be turned on one by one in a preset order through the switch control signal to drive the motor to start running. The control module also controls the on-time of the switch tube in each circuit through the PWM control signal to adjust the speed of the motor.

10. A control method for a portable fan according to claim 1, characterized in that: The control method comprises: The operating voltage of the high-speed three-phase motor is controlled to be 2 to 18 volts, the operating current of the high-speed three-phase motor is controlled to be 0.1 to 10 amps, and / or the rated operating power of the high-speed three-phase motor is controlled to be 0.5 to 100 watts; The rated operating speed of the high-speed three-phase motor is controlled through the driving module according to the operating voltage, the operating current and / or the rated operating power, so as to reduce the high-speed noise of the high-speed three-phase motor and control the wind speed within a preset wind speed range.

11. A motor drive control circuit for a portable fan, comprising a battery power supply, a voltage stabilizing unit, a main control unit, a motor, a USB access circuit, an analog-to-digital converter power supply circuit, and a display unit, characterized in that: The motor drive control circuit of the portable fan includes at least one of a motor drive control unit, a motor drive circuit, and a rotor position detection circuit.

12. The motor drive control circuit according to claim 1, characterized in that: The permanent magnet is arranged on the rotor of the motor, and the first winding, the second winding, and the third winding are arranged on the stator of the motor in the form of a Y-type connection; the MOS tube switch circuit of the motor drive circuit connects the first winding, the second winding, and the third winding of the motor, and the motor drive control unit controls the current size, flow direction or phase relationship of each phase winding.

13. The motor drive control circuit according to claim 2, characterized in that: The motor drive circuit includes: one end of a first MOS tube switch is connected to a power supply voltage, and the other end is connected to the first winding, and the conduction of the first MOS tube switch is controlled by a second MOS tube switch; one end of the second MOS tube switch is connected to the power supply voltage through a first resistor, and the other end is grounded; the second MOS tube switch receives a pulse modulation control signal of the motor drive control unit.

14. The motor drive control circuit according to claim 3, characterized in that: The motor drive circuit also includes: one end of a third MOS tube switch is connected to the first winding, and the other end is grounded through a current sampling resistor, and the third MOS tube switch receives a pulse modulation control signal from the motor drive control unit.

15. The motor drive control circuit according to claim 4, characterized in that: A reverse diode is arranged on the MOS tube switch.

16. The motor drive control circuit according to claim 5, characterized in that: The first MOS transistor switch is a P-type MOS transistor, and the second and third MOS transistor switches are N-type MOS transistors.

17. The motor drive control circuit according to claim 6, characterized in that: The second resistor is connected to the drain and source of the second MOS tube switch, and the third resistor is connected to the drain and source of the third MOS tube switch.

18. The motor drive control circuit according to claim 7, characterized in that: The motor drive circuit also includes: a MOS tube switch circuit composed of a fourth, fifth, and sixth MOS tube switches and a fourth, fifth, and sixth resistor, which controls the inflow and outflow of the second winding current; a MOS tube switch circuit composed of a seventh, eighth, and ninth MOS tube switches and a seventh, eighth, and ninth resistor, which controls the inflow and outflow of the third winding current.

19. The motor drive control circuit according to claim 8, characterized in that: The motor drive control unit includes a motor drive chip, and the motor drive chip outputs a motor drive signal to the gate of the MOS tube of the motor drive circuit.

20. The motor drive control circuit according to claim 9, characterized in that: The control chip of the main control unit is connected to the USB access circuit, the battery voltage detection analog-to-digital conversion circuit, and the display unit.