Fan, control circuit of neck-hanging type fan and motor driving circuit of portable fan

Abstract

A fan comprises a neck hanging shell (10), the neck hanging shell comprises a connecting section (11) and neck side sections (12) connected to the two sides of the connecting section respectively, and a neck hanging space (13) is defined by the connecting section and the two neck side sections jointly; electric blowing parts (20) are arranged on the connecting section and / or at least one neck side section, and all the electric blowing parts are used for blowing air in the direction of the neck hanging space.

Description

Control circuits for fans, neck-mounted fans, and motor drive circuits for portable fans Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a fan, a control circuit of a neck-hanging fan, and a motor drive circuit of a portable fan. Background Art

[0002] An electric fan, also known as a fan or blower, is a household appliance that uses an electric motor to rotate blades, accelerating air circulation. It is primarily used for cooling and ventilation. It is widely used in homes, classrooms, offices, shops, hospitals, and hotels. Electric fans on the market can be categorized by their intended use into two types: household fans and industrial exhaust fans. Household fans include ceiling fans, table fans, floor fans, wall fans, ceiling fans, ventilation fans, rotary fans, and air conditioning fans.

[0003] However, the small fans currently on the market need to be held by hand when in use, and the hand holding the fan cannot perform other operations while blowing air, resulting in a poor user experience.

[0004] Summary of the Invention

[0005] The main purpose of this application is to provide a fan, including: a neck hanging shell, the neck hanging shell includes a connecting section and neck side sections respectively connected to both sides of the connecting section, the connecting section and the two neck side sections are jointly arranged to form a neck hanging space; a hair dryer part is provided on the connecting section and / or at least one neck side section, and each hair dryer part is used to blow air in the direction of the neck hanging space. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] This application will illustrate the embodiments with reference to the accompanying drawings. The drawings in this application are only used to describe the embodiments for illustrative purposes. Without departing from the principles of this application, those skilled in the art can easily make other embodiments according to the steps described below by following the description.

[0007] FIG1-1 is a schematic structural diagram of a fan provided in an embodiment of the present application.

[0008] FIG1-2 is a schematic structural diagram of a fan from another perspective provided in an embodiment of the present application.

[0009] 1-3 are schematic structural diagrams of a fan with some parts removed provided in an embodiment of the present application.

[0010] 1-4 are schematic structural diagrams of a fan with some parts removed provided in an embodiment of the present application.

[0011] 1-5 are schematic structural diagrams of a fan with some parts removed provided in an embodiment of the present application.

[0012] 1-6 are schematic structural diagrams of a fan with some parts removed provided in an embodiment of the present application.

[0013] 1-7 are partial cross-sectional views of the fan provided in an embodiment of the present application.

[0014] Figure 1-8 is a partial enlarged view of area B in Figure 1-7.

[0015] 1-9 is a partial cross-sectional view of a fan provided in another embodiment of the present application.

[0016] Figure 1-10 is a partial enlarged view of area A in Figure 1-9.

[0017] Figure 2-1 is a three-dimensional diagram of the neck-hanging fan of the present invention.

[0018] Figure 2-2 is a cross-sectional view of the neck-hanging fan shown in Figure 2-1.

[0019] FIG2-3 is a schematic diagram of the charging and power supply circuit of the control circuit of the neck-hanging fan shown in FIG2-1.

[0020] FIG2-4 is a schematic diagram of the cooling control circuit of the control circuit of the neck-hanging fan shown in FIG2-1.

[0021] FIG2-5 is a schematic diagram of a fan drive circuit of the control circuit of the neck-hanging fan shown in FIG2-1.

[0022] FIG2-6 is a schematic diagram of the main control circuit of the control circuit of the neck-hanging fan shown in FIG2-1.

[0023] Figure 2-7 is a schematic diagram of the encoder circuit of the control circuit of the neck-hanging fan shown in Figure 2-1.

[0024] Figure 3-1 is the module diagram of the motor drive control circuit of a portable fan.

[0025] Figure 3-2 is the schematic diagram of the voltage stabilizing unit circuit.

[0026] Figure 3-3 is the schematic diagram of the motor drive control circuit.

[0027] Figure 3-4 is the schematic diagram of the rotor position detection circuit.

[0028] Figure 3-5 is the circuit diagram of the motor drive control unit.

[0029] Figure 3-6 is the circuit schematic diagram of the main control unit.

[0030] Figure 3-7 is the schematic diagram of the display unit circuit.

[0031] FIG4-1 is a circuit diagram of a main control chip of a main control circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0032] FIG4-2 is a schematic structural diagram of a three-phase drive circuit and a current detection circuit of a portable fan drive circuit provided in an embodiment of the present application.

[0033] FIG4-3 is a schematic structural diagram of a reverse electromotive force detection circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0034] Figure 4-4 is a structural diagram of the interface circuit and charging management circuit of the portable fan driving circuit provided in an embodiment of the present application.

[0035] 4-5 are schematic structural diagrams of an auxiliary chip of a main control circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0036] 4-6 are schematic diagrams of the circuit structure of the indicator light branch and buttons of the portable fan driving circuit provided in the embodiments of the present application.

[0037] 4-7 are schematic structural diagrams of a first speed control component of a portable fan driving circuit provided in an embodiment of the present application.

[0038] 4-8 are schematic structural diagrams of a second speed control device of a portable fan driving circuit provided in an embodiment of the present application.

[0039] 4-9 are schematic structural diagrams of the main control circuit of the portable fan driving circuit provided in an embodiment of the present application.

[0040] 4-10 are schematic structural diagrams of a three-phase drive circuit and a current detection circuit of a portable fan drive circuit provided in an embodiment of the present application.

[0041] 4-11 is a schematic structural diagram of a reverse electromotive force detection circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0042] 4-12 are schematic diagrams of a transistor temperature detection circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0043] 4-13 is a schematic diagram of a battery voltage detection circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0044] Figure 4-14 is a schematic diagram of the burning interface of the portable fan driving circuit provided in an embodiment of the present application.

[0045] 4-15 is a schematic structural diagram of a main control chip of a main control circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0046] 4-16 are schematic structural diagrams of a three-phase drive circuit and a battery voltage and current detection circuit of a portable fan drive circuit provided in an embodiment of the present application.

[0047] 4-17 is a schematic structural diagram of three three-phase control chips of the main control circuit of the portable fan drive circuit provided in an embodiment of the present application.

[0048] FIG4-18 is a schematic diagram of the structure of the signal amplifying circuit of the portable fan driving circuit provided in an embodiment of the present application.

[0049] FIG4-19 is a schematic structural diagram of a transistor temperature detection circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0050] FIG4-20 is a schematic diagram of the structure of the lighting control circuit of the portable fan driving circuit provided in an embodiment of the present application.

[0051] FIG4-21 is a schematic structural diagram of a Hall detection circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0052] FIG4-22 is a schematic structural diagram of a switch control circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0053] FIG4-23 is a schematic structural diagram of a DC conversion circuit of a portable fan driving circuit provided in an embodiment of the present application.

[0054] Figure 4-24 is a schematic diagram of the block structure of the portable fan provided in an embodiment of the present application.

[0055] Figure 5-1 is a diagram of the charging management circuit module of a portable fan.

[0056] Figure 5-2 is the circuit schematic diagram of the USB interface and fast charging management unit.

[0057] Figure 5-3 is the circuit schematic diagram of the charging management unit.

[0058] Figure 6-1 is a module diagram of the battery boost charging circuit for a portable fan.

[0059] Figure 6-2 shows the boost module circuit of the battery boost charging circuit of the portable fan.

[0060] Figure 6-3 shows the battery boost charging circuit charging voltage preset module, over-temperature protection module, and charging status indication module of the portable fan.

[0061] Figure 6-4 shows the USB interface circuit of the portable fan's battery boost charging circuit.

[0062] Figure 6-5 shows the signal transmission module of the battery boost charging circuit of the portable fan. DETAILED DESCRIPTION

[0063] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0064] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. The embodiments and features in the embodiments of this application may be combined with each other unless there is a conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0065] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0067] Solution 1 is shown in Figures 1-1 to 1-10.

[0068] Referring to Figures 1-1 to 1-10, according to one aspect of the present application, an embodiment of the present application provides a fan, comprising: a neck hanging housing 10, the neck hanging housing 10 comprising a connecting section 11 and neck side sections 12 respectively connected to both sides of the connecting section 11, the connecting section 11 and the two neck side sections 12 collectively enclosing a neck hanging space 13; and a blower unit 20 provided on the connecting section 11 and / or at least one neck side section 12, each blower unit 20 being configured to blow air in the direction of the neck hanging space 13. The fan provided in this embodiment, by providing two neck side sections on both sides of the connecting section 11, enables the connecting section 11 and the two neck side sections 12 to collectively enclose the neck hanging space 13, allowing a user to hang the fan provided in this embodiment on their body through the neck hanging space 13, thereby effectively freeing the user's hands. At the same time, by providing the blower unit 20 on the connecting section 11 and / or at least one neck side section 12, the fan provided in this embodiment can blow air into the neck hanging space 13, thereby providing the user with a good cooling experience.

[0069] Currently, portable fans on the market are driven by single-phase motors, which have low wind force and poor cooling effect, and cannot provide users with a better user experience.

[0070] Referring to Figures 1-3 to 1-10, in order to solve the above problems, the hair dryer unit 20 in this embodiment includes a positioning boss 21, a rotating fan blade 22, and a three-phase motor drive assembly 23 connected to the rotating fan blade 22. The three-phase motor drive assembly 23 includes a stator 231 and a rotor 232 sleeved outside the stator 231. The rotor 232 is fixedly mounted on the rotating fan blade 22 and is coaxially arranged with the rotating fan blade 22. The stator 231 is fixedly sleeved on the positioning boss 21. By using the three-phase motor drive assembly 23 to drive the rotating fan blade 22 provided in this embodiment, the hair dryer unit 20 provided in this application can output greater wind force into the neck hanging space 13, thereby effectively improving the user's cooling experience.

[0071] Referring to Figures 1-3 to 1-5, in a specific embodiment, a hair dryer 20 is provided on the connecting section 11 of this embodiment, a first air guide cavity 111 is provided in the connecting section 11, and a first air outlet 112 connected to the first air guide cavity 111 is provided on the connecting section 11. The first air outlet 112 is facing the direction of the neck hanging space 13, the positioning boss 21 is provided in the first air guide cavity 111, and the rotating fan blade 22 is rotatably installed in the first air guide cavity 111 for blowing air toward the first air outlet 112.

[0072] In a preferred embodiment, the rotating fan blade provided in this embodiment is a radial fan.

[0073] Referring to Figures 1-1 to 1-5, in a specific embodiment, in order to enable the fan provided in this embodiment to effectively blow air into the neck hanging space 13, a first air inlet 113 communicating with the first air guide cavity 111 is provided on the connecting section 11 in this embodiment. The first air inlet 113 faces the end of the rotating fan blade 22, and the first air outlet 112 faces the side of the rotating fan blade 22. By providing the first air inlet 113 facing the end of the rotating fan blade 22 and the first air outlet 112 facing the side of the rotating fan blade 22 on the connecting section 11 provided in this embodiment, the fan provided in this embodiment can effectively output external ambient air into the neck hanging space 13, thereby allowing the user to obtain a better cooling effect.

[0074] Referring to Figures 1-7 to 1-10, in a specific embodiment, a fixing hole 221 is provided on the rotating fan blade 22 in this embodiment, and the axis of the fixing hole 221 is collinear with the axis of the rotating fan blade 22. The hair dryer part 20 also includes a rotating shaft 24, and the first end of the rotating shaft 24 is fixedly inserted into the fixing hole 221; a positioning hole 211 is provided inside the positioning boss 21, and the axis of the positioning hole 211 is collinear with the axis of the rotating shaft 24. The second end of the rotating shaft 24 is rotatably inserted into the positioning hole 211.

[0075] Referring to Figures 1-3 to 1-5, in order to improve the cooling effect of the fan provided by this embodiment, a plurality of first air guide ribs 114 are provided in the connecting section 11 of this embodiment. The plurality of first air guide ribs 114 surround and form a first air guide cavity 111. There are a plurality of first air outlets 112, which are spaced apart along the extension direction of the connecting section 11, and the end of the first air guide cavity 111 is connected to the plurality of first air outlets 112. By providing a plurality of first air outlets 112 provided by this embodiment, and by spaced apart along the extension direction of the connecting section 11, and by connecting the end of the first air guide cavity 111 to the plurality of first air outlets 112, the air in the guide cavity can be evenly output from the plurality of first air outlets 112 to the neck hanging space 13 under the action of the hair dryer unit 20, thereby effectively improving the cooling effect of the fan provided by this embodiment.

[0076] 1-7 to 1-10 , since the rotating blades 22 provided in this embodiment are driven by a three-phase motor assembly with a relatively high rotation speed, in order to avoid rapid wear between the rotating shaft 24 and the positioning hole 211 due to high-speed rotation and to ensure the service life of the fan provided in this embodiment, at least one hair dryer unit 20 in this embodiment includes a bearing unit 25, the outer ring of the bearing unit 25 is fixed in the positioning hole 211, and the inner ring of the bearing unit 25 is sleeved on the second end of the rotating shaft 24; by fixing the outer ring of the bearing unit 25 provided in this embodiment in the positioning hole 211 and sleeved on the second end of the rotating shaft 24, the friction between the positioning hole 211 and the rotating shaft 24 can be converted from sliding friction to friction inside the bearing unit 25, which can effectively avoid wear between the positioning hole 211 and the rotating shaft 24, and effectively improve the service life of the hair dryer unit 20 provided in this embodiment.

[0077] 1-7 and 1-8, in a specific embodiment, the bearing portion 25 includes a rolling bearing 251, and the hair dryer portion 20 further includes a limiter 26, which is installed at the second end of the rotating shaft 24, and the bearing portion 25 is located between the limiter 26 and the first end of the rotating shaft 24; there are multiple bearing portions 25, and an inner flange 2111 is provided on the inner side wall of the positioning hole 211, and the inner flange 2111 is provided between two adjacent bearing portions 25 so that the two adjacent bearing portions 25 are spaced apart; by the limiter 26 provided on the second end of the rotating shaft 24 and the inner flange 2111 provided on the inner side wall of the positioning hole 211 provided in this embodiment, the inner and outer rings of the rolling bearing 251 provided in this embodiment can be effectively limited, so that the rolling bearing 251 provided in this embodiment can be effectively installed.

[0078] In a preferred embodiment, the hair dryer part 20 provided in this embodiment also includes an elastic member. The elastic member provided in this embodiment is arranged between the rolling bearing 251 close to the rotating fan blade 22 and the rotating fan blade 22, and is sleeved on the rotating shaft 24. The two ends of the elastic member provided in this embodiment are respectively in contact with the inner ring of the rolling bearing 251 and the rotating fan blade 22, and an elastic force is applied to the inner ring of the rolling bearing 251 away from the air outlet. Through the elastic member provided in this embodiment, the rolling bearing 251 can be pre-tightened, thereby effectively improving the service life of the rolling bearing 251.

[0079] In a preferred embodiment, the bearing portion 25 provided in this embodiment is a ball bearing, and lubricating oil is provided in the ball bearing provided in this embodiment.

[0080] In a preferred embodiment, the bearing portion 25 provided in this embodiment is a ceramic bearing, and lubricating oil is provided in the ceramic bearing provided in this embodiment.

[0081] In a preferred embodiment, the bearing portion 25 provided in this embodiment is a magnetic bearing.

[0082] 1-9 and 1-10 , in another embodiment, the bearing portion 25 includes a sliding bearing 252, and the hair dryer unit 20 further includes two sealing rings 27. Both sealing rings 27 are sleeved on the rotating shaft 24 and located on either side of the sliding bearing 252. By disposing the sliding bearing 252 provided in this embodiment between the rotating shaft 24 and the positioning hole 211, and by having the inner ring of the sliding bearing 252 fixedly connected to the second end of the rotating shaft 24 and the outer ring fixedly connected to the fixing hole 221, the friction between the rotating shaft 24 and the positioning hole 211 is converted into friction between the inner and outer rings of the sliding bearing 252, thereby preventing wear on the rotating shaft 24 and the positioning hole 211, thereby effectively extending the service life of the fan provided in this embodiment.

[0083] In a preferred embodiment, lubricating oil is provided in the sliding bearing 252 provided in this embodiment, and the sealing ring 27 provided in this embodiment, which is sleeved on the rotating shaft 24 and located on both sides of the sliding bearing 252, is used to seal the lubricating oil.

[0084] Referring to Figures 1-6 to 1-10, in a specific embodiment, a hair dryer 20 is provided on both neck side sections 12 in this embodiment, a second air guide cavity 121 is provided in the neck side section 12, and a second air outlet 122 connected to the second air guide cavity 121 is provided on the neck side section 12. The second air outlet 122 is facing the direction of the neck hanging space 13, the positioning boss 21 is provided in the second air guide cavity 121, and the rotating fan blade 22 is rotatably installed in the second air guide cavity 121 for blowing air to the second air outlet 122.

[0085] Referring to Figures 1-7 to 1-10, in a specific embodiment, a second air inlet 123 connected to the second air guide cavity 121 is provided on the neck side section 12 of this embodiment, the second air inlet 123 faces the end of the rotating fan blade 22, and the second air outlet 122 faces the side of the rotating fan blade 22.

[0086] In a preferred embodiment, there are multiple second air outlets 122 provided in this embodiment, and the multiple second air outlets are arranged at intervals along the extension direction of the neck side section 12.

[0087] In an optional embodiment, a hair dryer 20 is provided on one of the two neck side sections 12 provided in this embodiment, and a bearing portion 25 is provided on the hair dryer 20 provided in this embodiment.

[0088] In an optional embodiment, a hair dryer 20 is provided on the connecting section 11 and one of the two neck side sections 12 provided in this embodiment, and a bearing portion 25 is provided on the hair dryer 20 provided in this embodiment.

[0089] In an optional embodiment, the connecting section 11 and the two neck side sections 12 provided in this embodiment are both provided with a hair dryer 20 , and the hair dryer 20 provided in this embodiment is provided with a bearing portion 25 .

[0090] Referring to Figures 2 and 6, in order to enable the fan provided in this embodiment to operate without being connected to an external power source, the fan in this embodiment further includes a power supply unit 30, which is installed in the neck hanging shell 10. The power supply unit 30 is electrically connected to each hair dryer unit 20. A charging port 14 is provided on the neck hanging shell 10, and the charging port 14 is electrically connected to the power supply unit 30. By providing the power supply unit 30 in the neck hanging shell 10 provided in this embodiment and electrically connecting the power supply unit 30 to each hair dryer unit 20, the fan provided in this embodiment can blow air without being connected to an external power source, which effectively improves the versatility of the fan provided in this embodiment. At the same time, by providing the charging port 14 electrically connected to the power supply unit 30 on the neck hanging shell 10 provided in this embodiment, the power supply unit 30 provided in this embodiment can be connected to an external power source through the charging port 14, thereby realizing charging of the power supply unit 30.

[0091] In a preferred embodiment, the power supply unit 30 provided in this embodiment is a battery.

[0092] In a preferred embodiment, a filter is provided on at least one of the first air inlet 113 and the first air outlet 112 provided in this embodiment. By providing a filter on at least one of the first air inlet 113 and the first air outlet 112, it is possible to effectively prevent debris in the external environment from entering the fan provided in this embodiment.

[0093] In a preferred embodiment, a filter is provided on at least one of the second air inlet 123 and the second air outlet 122 provided in this embodiment. By providing a filter on at least one of the second air inlet 123 and the second air outlet 122, it is possible to effectively prevent debris in the external environment from entering the fan provided in this embodiment.

[0094] In a preferred embodiment, the fan provided in this embodiment further includes a gel containing portion. The first air guide cavity 111 and / or the second air guide cavity 121 provided in this embodiment are detachably provided with a gel containing portion. The gel containing box provided in this embodiment is used to contain a gel-type fragrance. By providing a gel-type fragrance in the gel containing portion provided in this embodiment, the air blown out by the fan provided in this embodiment can be scented, thereby providing customers with a better user experience.

[0095] In a specific embodiment, the gel holding portion provided in this embodiment includes a box body and a cover assembly provided on the box body. The box body provided in this embodiment is detachably installed in the first air guide cavity 111. The box body provided in this embodiment is provided with a holding cavity, which is used to hold the gel fragrance. The cover assembly provided in this embodiment includes a first cover and a second cover. The first cover provided in this embodiment is detachably installed on the box body. The second cover provided in this embodiment is pivotally connected to the first cover. The first cover provided in this embodiment is provided with a first opening. The second cover provided in this embodiment is provided with a second opening. The second cover provided in this embodiment has a shielding state that completely covers the first opening, and an open state in which the first opening and the second opening overlap. The second cover can be switched between the shielding state and the open state by rotating the second cover.

[0096] In summary, the fan provided by this embodiment has at least the following beneficial technical effects: the fan provided by this embodiment arranges two neck side sections on both sides of the connecting section 11, so that the connecting section 11 and the two neck side sections 12 can be jointly arranged to form a neck hanging space 13, so that the user can hang the fan provided by this embodiment on the body through the neck hanging space 13, thereby effectively freeing the user's hands. At the same time, by arranging a hair dryer part 20 on the connecting section 11 and / or at least one neck side section 12, the fan provided by this embodiment can blow air into the neck hanging space 13, so that the user can get a good cooling experience.

[0097] Option 2 is shown in Figures 2-1 to 2-7.

[0098] Referring to Figures 2-1 and 2-2, the present invention provides a neck-hanging fan 10, which includes a housing 11, a fan 12, a cooling element 13, a battery 14, and a control module 15. The housing 11 has an air inlet 111 and an air outlet 112. The fan 12, the battery 14, and the control module 15 are all located in the housing 11. The fan 12 is used to direct air from the air inlet 111 to the air outlet 112. The cooling element 13 is disposed on the housing 11. The neck-hanging fan 10 may also include a temperature conducting element 16, one side of which is intended to be close to the user's neck and the other side of which is intended to contact the cooling element 13.

[0099] The control module 15 includes a control circuit, which can be set on a circuit board. Specifically, please refer to Figures 2-3 to 2-7. The control circuit may include a charging and power supply circuit 20, a fan drive circuit 30, a cooling control circuit 40 and a main control circuit 50.

[0100] The charging and power supply circuit 20 is used to electrically connect an external power source and the battery 14 to receive an external voltage VCC to charge the battery 14 and output a power supply voltage V0. The fan driving circuit 30 is electrically connected to the charging and power supply circuit 20 and the fan 12 to drive the fan 12 to rotate.

[0101] The refrigeration control circuit 40 is electrically connected to the refrigeration element 13 and the charging and power supply circuit 20, and is used to drive the refrigeration element 13 to refrigerate. The refrigeration control circuit 40 includes a first control switch Q1, and the first conduction end of the first control switch Q1 is used to receive the output voltage of the battery 14 or the power supply voltage via the refrigeration element 13 (this embodiment is mainly explained by taking the reception of the output voltage of the battery 14 as an example), and the second conduction end of the first control switch Q1 is grounded.

[0102] The main control circuit 50 is electrically connected to the charging and power supply circuit 20, the fan drive circuit 30, and the control terminal of the first control switch Q1. The main control circuit 50 is configured to output a first pulse width control signal to control the on and off state of the first control switch Q1, thereby controlling the intermittent on and off state of the cooling element 13. Specifically, the first pulse width signal output terminal C_PWM of the main control circuit 50 can be electrically connected to the control terminal of the first control switch Q1 for outputting the first pulse width control signal.

[0103] Compared to the prior art, the control circuit of the neck-hanging fan provided in this embodiment of the utility model utilizes the cooling control circuit 40 having the first control switch Q1 to receive the first pulse width control signal output by the main control circuit 50, thereby controlling the intermittent on and off of the cooling element 13. This can alleviate user discomfort caused by excessively low temperatures when the cooling element is on for a long time, thereby improving the user experience. Furthermore, the cooling control circuit 40 is simple in structure, easy to implement, and highly reliable.

[0104] In this embodiment, as shown in FIG2-2 , the charging and power supply circuit 20 includes a charging port 21 and a charging management chip 22. A power supply terminal 211 of the charging port 21 receives the external voltage VCC and is electrically connected to a charging input pin VIN of the charging management chip 22. The power supply terminal 211 of the charging port 21 is also electrically connected to the negative terminal of a voltage regulator D1, the positive terminal of which is grounded. A switch pin SW of the charging management chip 22 is electrically connected to the positive terminal BAT+ of the battery 14 via a first inductor L1. A boost output pin VOUT of the charging management chip 22 is configured to output the supply voltage V0. The boost input pin of the charging management chip 22 is connected to the node between the battery 14 and the first inductor L1 via a first connection resistor 201 and to ground via a first grounding capacitor 202. The charging management chip 22, the voltage regulator D1, and the first inductor L1 effectively manage the charging and discharging of the charging port and the battery, and can output the supply voltage required by other circuits. This configuration is simple, easy to implement, and highly secure.

[0105] The key input terminal KEY of the charging management chip 22 is electrically connected to the main control circuit 50; the first LED driving pin LED1 of the charging management chip 22 is grounded via the first grounding resistor 203 and the second grounding resistor 204 in sequence, and the second LED driving pin LED2 of the charging management chip 22 is connected to the positive terminal of the battery 14 via the second connection resistor 205; the first indicator pin LED1 of the main control circuit 50 is grounded via the first indicator branch 51, and the second LED driving pin LED2 of the charging management chip 22 is also grounded via the second indicator branch 23. The first indicator branch 51 and the second indicator branch 23 both include a current limiting resistor R and an indicator LED connected in series. It can be understood that the key input terminal SW of the charging management chip 22 is electrically connected to the main control circuit 50, allowing the main control circuit 50 to control the charging management chip 22 and ensure the reliability of the control circuit; the charging and power supply status of the charging and power supply circuit 20 can be indicated via the first indicator branch 51 and the second indicator branch 23, improving the user experience. The main control circuit 50 can be an MCU.

[0106] As shown in Figures 2-4, in the cooling control circuit 40, the control end of the first control switch Q1 is electrically connected to the first pulse width signal output end C_PWM of the main control circuit 50 via a third connection resistor 207. The node between the control end of the first control switch Q1 and the third connection resistor 207 is also grounded via a fourth connection resistor 208. The first control switch Q1 is an NMOS (N-Metal-Oxide-Semiconductor), and the cooling element 13 also receives the output voltage of the battery 14 or the supply voltage via a fifth connection resistor 209. It can be understood that the third connection resistor 207 and the fourth connection resistor 208 can improve the stability and safety of the control circuit. The first control switch Q1 is an NMOS, which also has the technical advantages of low cost, simple structure and control. The cooling element 13 directly receives the output voltage MVCC of the battery 14, which can obtain a more direct and stable power supply, which is beneficial to improving the stability of the control circuit.

[0107] As shown in Figures 2-3 and 2-5, the control circuit further includes a second control switch Q2. A first conductive end of the second control switch Q2 is electrically connected to the positive terminal BAT+ of the battery 14 to receive the output voltage of the battery 14. A second conductive end of the second control switch Q2 is electrically connected to the positive terminal of the cooling element 13. A control end of the second control switch Q2 is configured to receive the external voltage VCC and is grounded, and is electrically connected to the second conductive end of the second control switch Q2 and the fan drive circuit 30. The second control switch Q2 is closed when receiving the external voltage VCC and is closed when not receiving the external voltage VCC. In this case, the fan drive circuit 30 is powered by the battery 14. Through the second control switch Q2, when the external voltage VCC is connected, the external voltage VCC can directly power the fan drive circuit 30, preventing the fan drive circuit 30 from using the output voltage of the battery 14. This not only allows the battery 14 to charge faster, but also prevents the battery 14 from being charged and discharged simultaneously, which can shorten its service life.

[0108] As shown in Figure 3, the control terminal of the second control switch Q2 can be grounded via a third grounding resistor 206 and electrically connected to the second conductive terminal of the second control switch Q2 and the fan drive circuit 30 via a first diode D2. The second control switch is a PMOS (P-Metal-Oxide-Semiconductor) field-effect transistor. It will be appreciated that the third grounding resistor 206 and the first diode D2 can improve the stability and safety of the control circuit. The second control switch Q2 is a PMOS field-effect transistor, which also has the technical advantages of low cost, simple structure and control.

[0109] As shown in Figures 2-5, the fan drive circuit 30 includes a second inductor L2, a third control switch Q3, a second diode D3 and a boost feedback branch 31. One end of the second inductor L2 is used to electrically connect to the charging and power supply circuit 20 to receive the external voltage VCC or the output voltage MVCC of the battery 14. The other end of the second inductor L2 is connected to the fan 12 via the second diode D3. The first conductive end of the third control switch Q3 is connected to the node between the second inductor L2 and the second diode D3. The second conductive end of the third control switch Q3 is grounded. The control end of the third control switch Q3 is electrically connected to the second of the main control circuit 50. The pulse width signal output terminal FPWM receives the second pulse width control signal output by the main control circuit 50. One end of the boost feedback branch 31 is connected to the node between the second diode D3 and the fan 12, and the other end of the boost feedback branch 31 is grounded. The boost feedback branch 31 includes a first voltage-dividing resistor 311 and a second voltage-dividing resistor 312 connected in series. The node between the first voltage-dividing resistor 311 and the second voltage-dividing resistor 312 is connected to the boost feedback terminal FAAD of the main control circuit 50 via a third voltage-dividing resistor 313. The node between the third voltage-dividing resistor 313 and the main control circuit 50 is also connected to ground via a second grounding capacitor 314. It can be understood that, with the above-described structure, the fan drive circuit 30 can charge and discharge the second inductor L2 by controlling the switching of the third control switch Q3, thereby increasing the voltage on the right side of the second inductor L2 and supplying power to the fan 12. The boost feedback branch 31 also samples the boosted voltage and feeds it back to the main control circuit 50, allowing the main control circuit 50 to adjust the second pulse width control signal provided to the third control switch Q3, thereby maintaining a substantially constant voltage for the fan 12. Furthermore, by adjusting the second pulse width control signal provided to the third control switch Q3, the voltage provided to the fan 12 can be increased or decreased, thereby controlling the fan 12 to achieve different speeds.

[0110] Furthermore, the fan drive circuit 30 may further include a fourth control switch Q4, a third diode D4, a first feedback resistor 315, and a second feedback resistor 316. The cathode of the third diode D4 is connected to the anode of the fan 12, the cathode of the fan 12 is connected to the anode of the third diode D4 and the first conducting end of the fourth control switch Q4, the control end of the fourth control switch Q4 is electrically connected to the fan enable end FAEN of the main control circuit 50, the second conducting end of the fourth control switch Q4 is grounded via the first feedback resistor 315, the node between the second conducting end of the fourth control switch Q4 and the first feedback resistor 315 is also electrically connected to the load feedback end LOAD AD of the main control circuit 50 via the second feedback resistor 316, and the node between the second feedback resistor 316 and the main control circuit 50 is also grounded via a third grounding capacitor 317. Through the fourth control switch Q4, the voltage boosted by the second inductor L2 and the third control switch Q3 can be connected to the ground via the fan 12 to form a loop, thereby driving the fan 12 to rotate. The signal at the node between the second conduction end of the fourth control switch Q4 and the first feedback resistor 315 is sampled through the first feedback resistor 315 and fed back to the main control circuit 50, so that the main control circuit 50 can detect whether the fan 12 is blocked or short-circuited.

[0111] As shown in Figures 2-7, the control circuit further includes an encoder 60, which is connected to the positive terminal BAT+ of the battery 14 and ground, respectively. The two output terminals 611 and 612 of the encoder 60 are also connected to the main control circuit 50, respectively. The encoder 60 has a stepless control knob for user operation. When the user operates the stepless control knob, the two output terminals 611 and 612 can output multiple different digital signals. The main control circuit 50 is used to control the first control switch Q1 based on the digital signals to control the cooling intensity of the cooling element 13, or to control the fan drive circuit 30 based on the digital signals to control the speed of the fan 12. It can be understood that through the encoder 60, the user can generate multiple different digital signals when operating the stepless control knob, and then the cooling intensity of the cooling element 13 or the speed of the fan 12 can be steplessly controlled based on the multiple different digital signals, which can improve the user experience.

[0112] Option 3 is shown in Figures 3-1 to 3-7.

[0113] As shown in Figure 3-1 of the specification:

[0114] 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.

[0115] Portable fans include: handheld fans, neck fans, wearable fans, waist-mounted fans, neck fans, head-mounted fans, desktop fans, car-mounted fans, etc.

[0116] As shown in Figure 3-2 of the specification:

[0117] 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.

[0118] 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.

[0119] As shown in Figure 3-3 of the specification:

[0120] 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 .

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] The current control principle of winding U2 is as follows:

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] As shown in Figures 3-4 of the specification:

[0132] 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.

[0133] 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.

[0134] 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 .

[0135] The driving control principle of the motor 500 is as follows:

[0136] 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.

[0137] As shown in Figures 3-5 of the specification:

[0138] 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.

[0139] As shown in Figures 3-6 and 3-7 of the specification:

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] Option 4 is shown in Figures 4-1 to 4-24.

[0146] Please refer to Figures 4-1 to 4-3. The first embodiment of the present invention provides a fan driving circuit, which can be used for various types of fans. Specifically, the fan driving circuit includes: a main control circuit 11, a three-phase driving circuit 12 and a reverse electromotive force detection circuit 14.

[0147] The three-phase drive circuit 12 includes at least three signal input terminals 121 and three drive signal output terminals 122. The at least three signal input terminals 121 are electrically connected to the main control circuit 11 to receive control signals respectively. The three drive signal output terminals 122 are used to electrically connect to the three signal terminals (U, V, W) of the DC brushless fan motor to output three-phase drive signals to drive the DC brushless fan motor to rotate. The reverse electromotive force detection circuit 14 includes three detection branches 141. Each detection branch 141 includes a detection terminal 1411 and a detection terminal electrically connected to the detection terminal. The three detection output ends 1411 of the three detection branches 141 are respectively electrically connected to the three drive signal output ends 122, and the three detection output ends 1412 of the three detection branches 141 are respectively electrically connected to the main control circuit 11, so as to output the first detection signal, the second detection signal and the third detection signal to the main control circuit respectively, so that the main control circuit 11 obtains the phase of the three-phase drive signal according to the first detection signal, the second detection signal and the third detection signal to adjust the control signal.

[0148] Please refer to Figure 3. The detection branch 141 includes a first detection resistor R1, a second detection resistor R2, and a third detection resistor R3. The first detection resistor R1 and the second detection resistor R2 are connected in series, and the end of the first detection resistor R1 away from the second detection resistor R2 is a detection end 1411. The end of the second detection resistor R2 away from the first detection resistor R1 is grounded. The node between the first detection resistor R1 and the second detection resistor R2 is the detection output end 1412.

[0149] Through the three-phase drive circuit 12, the energy-saving performance and control performance of the fan motor can be improved, and the service life of the fan drive circuit and the fan can be extended. Through the above-mentioned reverse electromotive force detection circuit 14, the main control circuit 11 can easily know the phase of the DC brushless fan motor, so that it can send a corresponding control signal to the three-phase drive circuit 12, effectively control the drive of the DC brushless fan motor, and improve the reliability and stability of the drive.

[0150] Please refer to FIG4-2 , the three-phase drive circuit 12 includes first to ninth transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, and Q9. The first conducting ends 1211 of the first to third transistors Q1, Q2, and Q3 are all connected to the power supply end 1212. The first conducting end 1211 of the fourth transistor Q4 is connected to the power supply end 1212. The first conducting end 1211 of the fifth transistor Q5 is connected to the power supply end 1212. The first conducting end 1211 of the sixth transistor Q6 is connected to the power supply end 1212. 1 is connected to the power supply terminal 1212, the control terminals of the fourth to sixth transistors Q4, Q5, and Q6 are respectively electrically connected to the main control circuit 11, and the control terminals of the seventh to ninth transistors Q7, Q8, and Q9 are respectively electrically connected to the control terminals of the fourth to sixth transistors Q4, Q5, and Q6 for receiving the control signal, the second conduction terminals 1213 of the fourth to sixth transistors Q4, Q5, and Q6 are all grounded, and the first conduction terminal 1211 of the seventh transistor Q7 is connected to the first conduction terminal 1212 of the first transistor Q1. The second conduction terminal 1213 of the seventh transistor Q7 is connected to the ground. The first conduction terminal 1211 of the eighth transistor Q8 is connected to the second conduction terminal 1213 of the second transistor Q2. The second conduction terminal 1213 of the eighth transistor Q8 is grounded. The first conduction terminal 1211 of the ninth transistor Q9 is connected to the second conduction terminal 1213 of the third transistor Q3. The second conduction terminal 1213 of the ninth transistor Q9 is grounded. A node between the first conduction terminal 1211 of the seventh transistor Q7 and the second conduction terminal 1213 of the first transistor Q1, a node between the first conduction terminal 1211 of the eighth transistor Q8 and the second conduction terminal 1213 of the second transistor Q2, and a node between the first conduction terminal 1211 of the ninth transistor Q9 and the second conduction terminal 1213 of the third transistor Q3 respectively serve as the three drive signal output terminals 122. The at least three signal input terminals 121 are three PWM signal input terminals, and the control signal includes three PWM signals.

[0151] As shown in FIG4-2 , the fan drive circuit further includes a current detection circuit 15. The second conducting ends 1213 of the seventh to ninth transistors Q7, Q8, and Q9 are all grounded via the current detection circuit 15. The current detection circuit 15 is also electrically connected to the main control circuit 11. The current detection circuit 15 includes a sensing resistor 151 and a sensing capacitor 152. The second conducting ends 1213 of the seventh to ninth transistors Q7, Q8, and Q9 are grounded via the sensing resistor 151 and the sensing capacitor 152, respectively. The node between the sensing resistor 151 and the sensing capacitor 152 is electrically connected to the main control circuit 11. Through the current detection circuit 15, when a current anomaly occurs, the main control circuit 11 can control the fan drive circuit to stop operating or operate at a lower power, thereby providing overcurrent protection for the fan drive circuit and improving the reliability and service life of the fan drive circuit.

[0152] Please refer to Figures 4-4 and 4-6. The fan drive circuit also includes an interface circuit 16 and a charging management circuit 17. The interface circuit 16 is used to electrically connect to an external power supply to receive an external voltage. The charging management circuit 17 is electrically connected between the interface circuit 16 and the battery VBAT, and is used to receive the external voltage and charge the battery VBAT or output a supply voltage. The fan drive circuit also includes a button 31, one end of the button 31 is connected to the main control circuit 11, and the other end is grounded. The fan drive circuit also includes an indicator light branch 19, and the indicator light branch 19 includes a light-emitting diode and a resistor connected in series. The positive electrode of the light-emitting diode is used to electrically connect to the main control circuit 11, and the negative electrode of the light-emitting diode is grounded.

[0153] Specifically, in this embodiment, the fan drive circuit can be used in a neck-hanging fan, but is not limited to neck-hanging fans. It can also be applied to other portable fans such as desktop fans, floor fans, handheld fans, clip fans, and folding fans. The two brushless DC fan motors are respectively provided on the left and right sides of the neck-hanging fan and are used to drive the left and right fan blades of the neck-hanging fan to rotate.

[0154] As shown in Figures 4-1, 4-2 and 4-5, the main control circuit 11 may include a main control chip 111 and an auxiliary chip 113. The main control circuit 11 includes the main control chip 111 and the auxiliary chip 113. The number of the three-phase drive circuit 12, the reverse electromotive force detection circuit 14 and the DC brushless fan motor are all two and one-to-one corresponding. The main control chip 111 is electrically connected to one of the three-phase drive circuits 12 to output the control signal to one of the three-phase drive circuits 12 to drive the corresponding one of the DC brushless fan motors. The reverse electromotive force detection circuit 14 is electrically connected to the corresponding three-phase drive circuit 12 and outputs the corresponding first detection signal, the second detection signal and the third detection signal to the main control chip 111, so that the main control chip 111 can know the three-phase of the three-phase drive circuit 12. The phase of the driving signal is used to adjust the control signal output to one of the three-phase driving circuits 12; the auxiliary chip 113 is electrically connected to another three-phase driving circuit 12 to output the control signal to the other three-phase driving circuit 12 to drive the corresponding other DC brushless fan motor, and the other reverse electromotive force detection circuit 14 is electrically connected to the corresponding three-phase driving circuit 12 and outputs the corresponding first detection signal, the second detection signal and the third detection signal to the auxiliary chip 113, so that the auxiliary chip 113 knows the phase of the three-phase driving signal of the other three-phase driving circuit 12 to adjust the control signal output to the other three-phase driving circuit 12.

[0155] In this embodiment, the main control chip 111, the corresponding three-phase drive circuit 12, and the corresponding reverse electromotive force detection circuit 14 are arranged on a module (such as a first circuit board), and can be arranged on the same side of the neck-hanging fan as the corresponding DC brushless fan motor. The auxiliary chip 113, the corresponding three-phase drive circuit 12, and the corresponding reverse electromotive force detection circuit 14 are arranged on another module (such as a second circuit board independent of the first circuit board), and can be arranged on the other side of the neck-hanging fan with the corresponding DC brushless fan motor. It can be understood that the above design has good rationality and compactness, and can also improve the reliability of connection and drive. However, the layout of the three-phase drive circuit 12, the reverse electromotive force detection circuit 14, the main control chip 111, and the auxiliary chip 113 can be varied. For example, the three-phase drive circuit 12, the reverse electromotive force detection circuit 14, the main control chip 111, and the auxiliary chip 113 are all arranged on the same circuit board, or the three-phase drive circuit 12 and the reverse electromotive force detection circuit 14 are arranged on one circuit board, and the main control chip 111 and the auxiliary chip 113 are arranged on another circuit board. The specific selection can be made according to actual needs and will not be repeated here.

[0156] Referring to Figures 4-7 and 4-8 , the fan drive circuit further includes a first connector 261 and a speed control interface circuit 26 having a second connector 262. The first and second pins of the first connector 261 are electrically connected to the main control chip 111, respectively. The third pin of the first connector 261 is grounded. The first pin of the second connector 262 is connected to the battery VBAT via a first connection resistor and to the auxiliary chip 113 via a second connection resistor. The second pin of the second connector 262 is connected to the auxiliary chip 113 via a third connection resistor. The third pin of the second connector 262 is grounded. Furthermore, the pins of the first connector 261 and the second connector 262 can be electrically connected one-to-one, allowing for synchronous speed adjustment of the two brushless DC fan motors.

[0157] Referring to Figures 4-9 to 4-14, a second embodiment of the present application provides a fan drive circuit. The portions of the fan drive circuit that are identical to those of the first embodiment are not described in detail. The following focuses on the differences between the fan drive circuit of the second embodiment and the fan drive circuit of the first embodiment. First, the main control circuit 11 of the second embodiment differs from the main control circuit 11 of the first embodiment, and the main control circuit 11 of the second embodiment may primarily include a main control chip 111.

[0158] As shown in Figures 4-10, in the second embodiment, the three-phase drive circuit 12 includes first to sixth transistors Q1, Q2, Q3, Q4, Q5, and Q6. The first conduction ends 1211 of the first to third transistors Q1, Q2, and Q3 are all connected to the power supply end 1212. The first conduction end 1211 of the fourth transistor Q4 is connected to the second conduction end 1213 of the first transistor Q1. The first conduction end 1211 of the fifth transistor Q5 is connected to the second conduction end 1213 of the second transistor Q2. The first conduction end 1211 of the sixth transistor Q6 is connected to the second conduction end 1213 of the third transistor Q3. The node between the first conduction end 1211 of the fourth transistor Q4 and the second conduction end 1213 of the first transistor Q1, the node between the first conduction end 1211 of the fifth transistor Q5 and the second conduction end 1213 of the second transistor Q2, and the node between the first conduction end 1211 of the sixth transistor Q6 and the second conduction end 1213 of the third transistor Q3 respectively serve as the three drive signal output ends 122, and the control ends of the first to sixth transistors Q1, Q2, Q3, Q4, Q5, and Q6 are respectively used to electrically connect to the main control circuit 11 to receive the control signals; the control signals include six PWM signals.

[0159] As shown in FIG4-10, basically the same as the first embodiment is that the second conduction end 1213 of the sixth transistor Q6 is grounded via the current detection circuit 15, and the current detection circuit 15 is also electrically connected to the main control circuit 11; the current detection circuit 15 includes a sensing resistor 151 and a sensing capacitor 152, the second conduction end 1213 of the sixth transistor Q6 is grounded via the sensing resistor 151, the sensing capacitor 152 is connected in parallel with the sensing resistor 151, and a node between the sensing resistor 151 and the second conduction end 1213 of the sixth transistor Q6 is electrically connected to the main control circuit 11; the current detection circuit 15 also includes a first series resistor 153, a second series resistor 154, and a parallel resistor 155, the parallel resistor 155 is connected in parallel with the sensing resistor 151, the first series resistor 153 is connected between one end of the sensing capacitor 152 and one end of the sensing resistor 151, and the second series resistor 154 is connected between the other end of the sensing capacitor 152 and the other end of the sensing resistor 151. Through the current detection circuit 15, when a current abnormality occurs, the main control circuit 11 can control the fan drive circuit to stop working or operate at a lower power, so as to perform overcurrent protection on the fan drive circuit and improve the reliability and service life of the fan drive circuit.

[0160] As shown in FIG. 4-11 , the reverse electromotive force detection circuit 14 of the second embodiment is substantially the same as the reverse electromotive force detection circuit 14 of the first embodiment, and will not be described in detail here.

[0161] As shown in Figure 4-12, the fan drive circuit also includes a transistor temperature detection circuit 24. The transistor temperature detection circuit 24 can be arranged adjacent to each transistor of the three-phase drive circuit 12, and includes a first voltage-dividing resistor 241 and a thermistor 242 connected in series. The thermistor 242 is used to sense the temperature of each transistor of the three-phase drive circuit 12. The node between the first voltage-dividing resistor 241 and the thermistor 242 is electrically connected to the main control circuit 11 and is used to output a temperature signal, so that the main control circuit 11 controls whether the fan drive circuit enters a temperature protection state according to the temperature signal; the thermistor 242 is connected between the first voltage-dividing resistor 241 and ground, and the transistor temperature detection circuit 24 also includes a voltage-stabilizing capacitor 243 connected in parallel with the thermistor 242. Through the transistor temperature detection circuit 24, the main control circuit 11 can know whether the temperature of each transistor of the three-phase drive circuit 12 is abnormal, and when an abnormality occurs, it can control the fan drive circuit to stop working or operate at a lower power, so as to protect the fan drive circuit from overtemperature and improve the reliability and service life of the fan drive circuit.

[0162] As shown in FIG4-13 , the fan drive circuit further includes a battery voltage detection circuit 25 electrically connected between the positive terminal of the battery VBAT and ground. The output of the battery voltage detection circuit 25 is electrically connected to the main control circuit 11. Through the battery voltage detection circuit 25, the main control circuit 11 can determine whether the battery voltage is normal. If the battery voltage is abnormal, the main control circuit 11 can control the fan drive circuit to stop operating or operate at a lower power, thereby improving the reliability and service life of the fan drive circuit.

[0163] Specifically, the battery voltage detection circuit 25 includes a second voltage-dividing resistor 251 and a third voltage-dividing resistor 252 connected in series, and the node between the second voltage-dividing resistor 251 and the third voltage-dividing resistor 252 is electrically connected to the main control circuit 11. It can be understood that the battery voltage detection circuit 25 has a simple structure, high reliability, and low cost.

[0164] As shown in FIG. 4-14 , the fan driving circuit of the second embodiment of the present invention further includes a programming interface 28 for programming the control program into the main control circuit 11 . The programming interface 28 may be a SWD programming interface, but is not limited thereto.

[0165] Please refer to Figures 4-15 to 4-16. The third embodiment of the present application provides a fan driving circuit. The parts of the fan driving circuit that are the same as those of the fan driving circuit of the second embodiment are not repeated. The following mainly focuses on the differences between the fan driving circuit of the third embodiment and the fan driving circuit of the second embodiment.

[0166] As shown in Figures 4-15 to 4-17, the three-phase drive circuit 12 of the third embodiment is basically the same as the three-phase drive circuit 12 of the second embodiment, and the main control circuit 11 of the third embodiment is different from the main control circuit 11 of the second embodiment. The main control circuit 11 includes a main control chip 111 and three three-phase control chips 112, and each of the three-phase control chips 112 is electrically connected to the main control chip 111 and the three-phase drive circuit 12.

[0167] As shown in Figures 4-16 and 4-18, the fan drive circuit further includes a filter capacitor 253 and a sampling resistor 254 connected in series. The sampling resistor 254 is connected between the filter capacitor 253 and ground, and the node between the filter capacitor 253 and the sampling resistor 254 is electrically connected to the main control circuit 11. Furthermore, the fan drive circuit further includes a signal amplification circuit 29, the input of which is connected to the node between the filter capacitor 253 and the sampling resistor 254. The signal amplification circuit 29 is configured to amplify the signal sampled by the sampling resistor 254 (i.e., the signal at the node between the filter capacitor 253 and the sampling resistor 254) and provide the amplified signal to the main control circuit 11. This allows the main control circuit 11 of the fan drive circuit to keenly detect abnormal voltage or current signals when an abnormality occurs in the entire fan drive circuit. The main control circuit 11 can then perform abnormality protection operations, such as stopping operation or reducing fan speed, thereby improving the safety of the fan drive circuit.

[0168] As shown in FIG. 4-19 , the transistor temperature detection circuit 24 in the third embodiment is substantially the same as that in the second embodiment, and will not be described in detail here.

[0169] Please refer to Figure 4-20, which is a schematic diagram of the structure of a light control circuit 30 of a fan drive circuit according to a third embodiment of the present invention. The light control circuit 30 includes a light-emitting element 301 and a control switch 302. The positive electrode of the light-emitting element 301 receives a driving voltage, and the negative electrode of the light-emitting element 301 is grounded via a resistor and the two conductive terminals of the control switch 302. The control terminal of the control switch 302 is electrically connected to the main control circuit 11, so that the main control circuit 11 outputs a light control signal to the control terminal of the control switch 302 to control the light emission of the light-emitting element 301.

[0170] As shown in Figure 4-21, the fan drive circuit also includes a Hall detection circuit 23, which is electrically connected to the main control circuit 11 and is used to detect the magnetic field generated by the DC brushless fan motor and output a Hall detection signal to the main control circuit 11, so that the main control circuit 11 can obtain the position of the rotor of the DC brushless fan motor based on the Hall detection signal, and then can provide a corresponding control signal to control the operation of the three-phase drive circuit 12. At this time, the startup time of the fan using the fan drive circuit is shorter, there will be no jitter during startup, and the user experience is higher.

[0171] As shown in Figure 4-21, the Hall detection circuit 23 also includes a motor temperature detection element 232, which is connected between the Hall element 231 of the Hall detection circuit 23 and the main control circuit 11. The motor temperature detection element 232 can be a sampling resistor. Through the motor temperature detection element 232, the main control circuit 11 can know whether the temperature of the DC brushless fan motor is abnormal, and when an abnormality occurs, it can control the fan drive circuit to stop working or operate at a lower power, so as to perform over-temperature protection on the fan drive circuit and improve the reliability and service life of the fan drive circuit.

[0172] As shown in Figures 4-17 and 4-22, the fan drive circuit also includes a voltage conversion circuit 20, which is used to receive a battery voltage (VB+) and convert the battery voltage into a drive voltage (such as 15V), and provide the drive voltage to the power supply ends of the three three-phase control chips 112. The main control chip 111 is used to output a main control signal to the three three-phase control chips 112, so that the three three-phase control chips 112 respectively output the control signal to the three-phase drive circuit 12.

[0173] The fan drive circuit also includes a switch control circuit 21, which is electrically connected to the battery VBAT, the voltage conversion circuit 20, and the main control circuit 11, and is used to control the operation of the voltage conversion circuit 20. The switch control circuit 21 includes a button 211, a first switch 212, a second switch 213, and a third switch 214. The two conductive ends of the first switch 212 are respectively connected to the positive electrode of the battery VBAT and the input end of the voltage conversion circuit 20. The control end of the first switch 212 is grounded via the two conductive ends of the third switch 214. The positive electrode of the battery VBAT is also connected to the control end of the third switch 214 via the two conductive ends of the first switch 212 and a unidirectional diode 215. The control end of the second switch 213 is grounded via the button 211. The control end of the third switch 214 is electrically connected to the main control circuit 11, and the node between the second switch 213 and the unidirectional diode 215 is also electrically connected to the switch signal end of the main control circuit 11.

[0174] When the button 211 is pressed and turned on, the second switch tube 213 is turned on, the third switch tube 214 is turned on, and the node between the second switch tube 213 and the one-way diode 215 outputs a first switching signal (ON) to the switch signal terminal of the main control circuit 11. The first switch tube 212 is turned on, so that the battery voltage of the battery VBAT is provided to the voltage conversion circuit 20. When the button 211 is no longer pressed, the second switch tube 213 is turned off, and the main control circuit 11 outputs a power-on signal to the control terminal of the third switch tube 214 based on the first switching signal to maintain the conduction of the third switch tube 214. The battery voltage of the battery VBAT is provided to the voltage conversion circuit 20.

[0175] Furthermore, when the battery voltage of the battery VBAT is provided to the voltage conversion circuit 20, when the button 211 is pressed and turned on again, the node between the second switch tube 213 and the one-way diode 215 outputs a second switch signal (OFF) to the switch signal end of the main control circuit 11. The main control circuit 11 outputs a power-off signal to the control end of the third switch tube 214 according to the second switch signal to control the third switch tube 214 to turn off, and then the first switch tube 212 is turned off. The battery voltage of the battery VBAT cannot be provided to the voltage conversion circuit 20 until the button 211 is pressed and turned on again.

[0176] The button 211 , the first switch tube 212 , the second switch tube 213 , and the third switch tube 214 cooperate with the main control circuit 11 to control whether the battery voltage of the battery VBAT is provided to the voltage conversion circuit 20 . This not only simplifies the control logic but also has the advantage of high reliability.

[0177] As shown in FIG. 4-23 , the fan driving circuit further includes a DC conversion circuit 22 , which is configured to receive the driving voltage (eg, a 15V DC voltage) and convert it into other DC operating voltages, such as 3.3V and 5V DC operating voltages.

[0178] Please refer to Figure 24. An embodiment of the present invention also provides a portable fan 2, which includes a fan driving circuit 3, a DC brushless fan motor 4, and fan blades 5 driven by the DC brushless fan motor. The fan driving circuit 3 adopts the fan driving circuit described in any of the above embodiments.

[0179] Compared with the prior art, the fan drive circuit and the portable fan 2 in the above-mentioned embodiment, by using the main control circuit 11, the three-phase drive circuit 12, the reverse electromotive force detection circuit 14 and the DC brushless fan motor, can not only improve the energy-saving performance and control performance of the fan motor and thus improve the reliability of the fan drive circuit and the fan 2, but also extend the service life of the fan drive circuit and the fan 2. In addition, the use of the DC brushless fan motor makes the fan 2 simpler in structure and smaller in size, which can improve the market competitiveness of the product.

[0180] Option 5 is shown in Figures 5-1 to 5-3.

[0181] As shown in Figures 5-1 to 5-3 of the specification:

[0182] A charging management circuit for a portable fan includes at least one of a fast-charge management unit 300 and a charging management unit 400. The fast-charge management unit 300 includes a fast-charge communication module, a fast-charge control signal output module, a fast-charge voltage setting module, and a fast-charge current setting module. The charging management unit 400 includes a charging communication module, a charging driver module, a charging current detection module, a termination voltage setting module, a charging status output module, and an over-temperature protection module. The charging management circuit of a portable fan equipped with both the fast-charge management unit and the charging management unit can switch between fast-charge mode and standard boost charging mode.

[0183] Portable fans include: handheld fans, neck fans, desktop fans, waist-mounted fans, neck-mounted fans, head-mounted fans, etc.

[0184] The charging management circuit also includes: a charging adapter 100, a USB input unit 210, a USB output unit 220, a control unit 500, a battery pack 600, and a charging display unit 700; the charging adapter 100 is connected to the USB input unit 210; the USB output unit 220 is connected to the fast charging management unit 300 and the charging management unit 400; the fast charging management unit 300 and the charging management unit 400 are connected to the control unit 500; the fast charging control signal output module of the fast charging management unit 300 is connected to the controlled end of the switching circuit; the charging management unit 400 is connected to the battery pack 600, and the fast charging management unit 300 and the control unit 500 are connected to the battery pack 600 through the charging management unit 400; the charging display unit 700 is connected to the control unit 500.

[0185] The portable fan is connected to the battery pack 600 through the charging adapter 100, USB input unit 210, USB output unit 220 and fast charging management unit 300, charging management unit 400, and control unit 500 to power the battery pack 600; the fast charging management unit 300 and charging management unit 400 communicate with the charging adapter 100 through the USB interface.

[0186] The USB output unit 220 includes a USB interface J1 , the fast charge management unit 300 includes a power supply protocol chip (USB PD Sink) U2 , and the charging management unit 400 includes a charging chip U1 .

[0187] Pins A1B12 and A12B1 of USB interface J1 are grounded. The fast charge management unit 300 and the charging management unit 400 are connected to the VBUS pins A4B9 and A9B4 of USB interface J1 to accept an external power source. The DP data pin A6B6 and the DM data pin A7B7 of USB interface J1 are connected to the fast charge management unit 300 and the charging management unit 400 to identify the external power source. DP (data plus) and DM (data minus) are USB data signal lines.

[0188] In one embodiment, the power-taking protocol chip U2 is connected to the USB interface J1 through the data signal line and configuration channel of the fast-charging communication module. The fast-charging communication module includes: the DP' data pin 2 of the power-taking protocol chip U2 is connected to the DP data pin A6B6 of the USB interface J1 through the current-limiting resistor R1; the DM' data pin 3 of the power-taking protocol chip U2 is connected to the DM data pin A7B7 of the USB interface J1 through the current-limiting resistor R2; the CC1 configuration channel first pin 4 and the CC2 configuration channel second pin 5 of the power-taking protocol chip U2 are respectively connected to the CC1 configuration channel first pin A5 and the CC2 configuration channel second pin B5 of the USB interface J1, and the CC1 configuration channel (Connection Configuration) first pin 4 and the CC2 configuration channel second pin 5 of the power-taking protocol chip U2 are respectively grounded through capacitors C1 and C2, and the capacitors C1 and C2 are used to filter current and stabilize voltage. The fast charging communication module of the power acquisition protocol chip U2 is connected to the charging adapter 100 via a USB cable to establish a data mode (DM, DP communication) and a fast charging communication mode (Powered Device: PD2.0 / 3.0, Quick Connect: QC2.0 / 3.0, Appledivider3, Battery Charge: BC1.2SDP, Digital Communication Protocol / Charging Downstream Port: DCP / CDP), which is used to apply for, identify, and monitor the voltage required for charging the portable fan battery pack 600.

[0189] In one embodiment, the fast charge control signal output module includes: the power protocol chip U2 establishes fast charge communication with the charging adapter 100 by configuring the channel pins (pins 4 and 5); and outputs the fast charge drive signal through the fast charge drive pin 10.

[0190] In one embodiment, the VIN chip power supply pin 1 of the power protocol chip U2 is connected to VBUS via a current limiting resistor R3 , and the VIN chip power supply pin 1 of the power protocol chip U2 is grounded via a voltage stabilizing capacitor C3 .

[0191] The fast charging voltage setting module includes: the VSET voltage setting pin 8 of the power supply protocol chip U2 is grounded through the resistor R4, and the power supply protocol chip U2 obtains the voltage signal of the resistor R4, thereby setting the charging voltage of the battery pack 600 in the fast charging mode; the fast charging voltage of the battery pack 600 can be changed by changing the resistance value of R4.

[0192] The fast charging current setting module includes: the ISET current setting pin 9 of the power supply protocol chip U2 is grounded through the resistor R5, and the power supply protocol chip U2 obtains the voltage signal of the resistor R5, thereby setting the charging current of the battery pack 600 in the fast charging mode; the fast charging current of the battery pack 600 can be changed by changing the resistance value of R5.

[0193] The working principle of fast charging mode is as follows:

[0194] The power acquisition protocol chip U2 establishes PD fast charging communication with the charging adapter 100 through the first pin 4 of the CC1 configuration channel and the second pin 5 of the CC2 configuration channel, sets the fast charging voltage by monitoring the VSET voltage setting pin 8 signal, sets the fast charging current by monitoring the ISET current setting pin 9 signal, outputs the fast charging drive signal through the GATE pin 10, and the charging head outputs a high voltage to fast charge the battery pack 600, and connects the I2C (serial bus) bus and the control unit 500 of the portable fan to communicate and transmit the fast charging status through the SDA (Serial Data line) pin 6 and the SCL (Serial Clock line) pin 7.

[0195] The VBUS charging input pin 1 of the charging chip U1 is connected to VBUS; one end of the voltage stabilizing capacitor C4 is connected to the VBUS charging input pin 1 of the charging chip U1, and the other end is grounded, which is used to filter current and stabilize power supply.

[0196] In one embodiment, the charging communication module includes: DPC data positive signal pin 5 of the charging chip U1 is connected to the USB data positive signal through a current-limiting resistor R6, and DMC data negative signal pin 6 is connected to the USB data negative signal through a current-limiting resistor R7. The charging communication module is used by the charging chip U1 to identify the status of the external power supply.

[0197] In one embodiment, the charging drive module includes: the first pin 12 of the SW1 inductor and the second pin 13 of the SW2 inductor of the charging chip U1 are respectively connected to the two ends of the transformer energy storage inductor L1; the first bootstrap capacitor pin 11 of the BT1 and the second bootstrap capacitor pin 14 of the BT2 of the charging chip U1 are respectively connected to the two ends of the transformer energy storage inductor L1 through capacitors C5 and C6, and the capacitors C5 and C6 are bootstrap capacitors that provide a boost bias voltage for the boost circuit; the two ends of the transformer energy storage inductor L1 are respectively grounded through current limiting resistors R8 and R9; two RC circuits are set on the NC of the charging chip U1, which are connected in parallel with R8 and R9 and then grounded, which can be used to filter out high-frequency signals.

[0198] The VBAT charging output pin 3 of the charging chip U1 is connected to the battery pack 600. Filter capacitors C7, C8, C9, C10, and C11 are connected in parallel, with one end connected to pin 3 of the charging chip U1 and the other end grounded. The anode of diode D2 is grounded, and the cathode is connected to the VBAT charging output pin 3 of the charging chip U1. The charging chip U1 charges the battery pack 600 through a boost charging method using the charging driver module.

[0199] The working principle of normal charging mode is as follows:

[0200] The charging adapter 100 is an ordinary charging adapter. The charging chip U1 communicates with the charging adapter 100 by handshaking through the DPC data positive signal pins 5 and 6 to request a charging voltage. The charging chip U1 controls the internal integrated MOS tube circuit to charge and store energy for the inductor L1. Then the charging chip U1 turns on the MOS tube circuit to release the energy of the inductor L1. At this time, the inductor L1 and VBUS are connected in series to superimpose a voltage boosting effect, and the battery pack 600 is charged through the boost circuit.

[0201] The charging chip U1 has a step-up and step-down function. When the input voltage is lower than the charging voltage, the charging chip U1 increases the voltage to the charging voltage to charge the battery pack 600. When the input voltage is higher than the charging voltage, the charging chip U1 decreases the voltage to the charging voltage to charge the battery pack 600.

[0202] In one embodiment, the charging current detection module includes a connection between the positive current sampling pin 20 of the CSP of the charging chip U1 and the negative current sampling pin 21 of the CSN, via a sampling resistor R10, for sensing the charging current. Capacitors C12, C13, C14, and C15 are connected in parallel, with one end connected to the positive current sampling pin 20 of the CSP of the charging chip U1 and the other end grounded, for current filtering and voltage stabilization. The CSO sensing current monitoring pin 19 of the charging chip U1 is grounded via a resistor R11. The voltage of the CSO sensing current monitoring pin 19 of the charging chip U1 is proportional to the sensing charging current. The charging current detection module detects the charging current of the battery pack 600 through the charging chip U1.

[0203] In one embodiment, the termination voltage setting module: the CSE battery termination voltage setting pin 7 of the charging chip U1 is grounded through a resistor R12, and the resistance value of the resistor R12 is used to set the battery termination voltage in the charging mode.

[0204] In one embodiment, in the over-temperature protection module, the NTC thermistor pin 18 of the charging chip U1 is connected to ground via a resistor R14 .

[0205] Charging status output module: The PG charging status pin 8 of the charging chip U1 is connected to the power supply voltage VCC through the pull-up resistor R13, and the charging chip U1 outputs the charging status signal through the PG charging status pin 8.

[0206] Loop compensation module: The COMP loop compensation pin 17 of the charging chip U1 is connected to the RC circuit composed of resistor R15 and capacitor C17 and grounded to enhance the stability and transient response of the circuit.

[0207] The VCC chip working voltage output pin 9 of the charging chip U1 outputs the working voltage and is grounded through the voltage stabilizing capacitor C16.

[0208] Option 6 is shown in Figures 6-1 to 6-5.

[0209] As shown in Figure 6-1 of the specification:

[0210] A battery boost charging circuit for a portable fan comprises a USB interface, a boost module, a boost charging management module, a charging voltage preset module, a charging state indication module, and an over-temperature protection module.

[0211] Portable fans include: handheld fans, neck fans, waist fans, neck fans, head fans, desktop fans, car fans, etc.

[0212] The USB interface includes an interface J1, and the boost charging management module includes a charging chip U1.

[0213] As shown in Figure 6-2 of the specification:

[0214] In one embodiment, the boost charging management module has the following features: the charging chip U1 integrates a power MOS tube and a Boost synchronous boost circuit.

[0215] The boost module circuit includes: inductor L1, one end connected to the USB voltage VBUS, and the other end connected to the LX external inductor pin 8 of charging chip U1; charging chip U1's BST bootstrap capacitor pin 7 connected to pin 8 via bootstrap capacitor C2, which increases the DC bias voltage in the amplifier circuit and enhances the amplitude of the output signal; charging chip U1's LX external inductor pin 8 is connected to ground via resistor R1 and capacitor C1. Resistor R1 and capacitor C1 are connected in series to form an RC circuit to filter high-frequency signals; current-limiting resistor R2 is connected to the USB voltage VBUS at one end and to the VIN power input pin 6 of charging chip U1 at the other end to introduce input voltage. The VIN power input pin 6 of charging chip U1 is connected to ground via capacitor C4 to filter current; and voltage-stabilizing capacitor C5 is connected to the USB voltage VBUS at one end and to ground at the other end. The boost charging circuit boosts and charges the BAT battery through the boost module.

[0216] The portable fan's battery boost charging circuit incorporates a voltage stabilization and filtering circuit: The boost output VOUT of the charging chip U1 is boosted to output pin 2, which uses the output charging voltage to charge the BAT battery. Filter capacitors C3 and C6 are connected in parallel and connected to the VBAT voltage, with the other end grounded. The boost module NC (normally closed) is equipped with a diode D1, with the positive terminal of diode D1 connected to ground and the negative terminal connected to VBAT.

[0217] Capacitors C7, C8, and C9 are connected in parallel, with one end connected to pin 1, the intermediate node of the VSYS boost output of the charger chip U1, and the other end connected to ground. The voltage stabilization filter circuit filters the current and stabilizes the voltage at the charger output.

[0218] Pin 0 of the charging chip U1 is grounded.

[0219] The working principle of the boost module is as follows:

[0220] After the MOS tube connected to the inductor L1 in the charging chip U1 is turned on, the inductor L1 is grounded. As the current in the inductor L1 increases, the inductor L1 begins to store energy; after the MOS tube connected to the inductor L1 in the charging chip U1 is turned off, the inductor L1 releases the stored energy. At this time, the inductor L1 and the USB voltage VBUS are connected in series to achieve a boost effect, and the BAT battery is charged through the Boost synchronous boost circuit; the MOS tube of the charging chip U1 is controlled by its internal logic. When the charging chip U1 is not working, the MOS tube turns off the chip output to prevent the risk of leakage.

[0221] As shown in Figure 6-3 of the specification:

[0222] In one embodiment, the charging voltage preset module has the following features: a resistor R3 is provided, one end of which is connected to the VSET voltage setting pin 4 of the charging chip U1 and the other end is grounded. The charging chip U1 determines the output charging voltage based on the electrical signal detected by R4. The battery boost charging circuit uses the charging voltage preset module to set the charging voltage.

[0223] In one embodiment, the overtemperature protection module has the following features: one end of thermistor R4 is connected to pin 3 of the NTC thermistor of the charging chip U1, and the other end is grounded. The charging chip U1 detects the voltage across thermistor R4 to determine the battery temperature, thereby implementing the overtemperature protection function of the charging module. The battery boost charging circuit implements the overtemperature protection function of the circuit through the overtemperature protection module.

[0224] In one embodiment, the charging status indicator module has the following features: a resistor R5 is provided, one end of which is connected to the LED charging indicator pin 5 of the charging chip U1 and the other end is grounded. The LED charging indicator pin 5 of the charging chip U1 outputs a charging status signal PG. The battery boost charging circuit outputs and displays the charging status through the charging status indicator module.

[0225] As shown in Figure 6-4 of the specification:

[0226] In one embodiment, the battery boost charging circuit is equipped with a charging communication module, including: Pin 2 of interface J1 is connected to Pin 5 to output the USB voltage VBUS of the boost charging circuit; Pin 3 of the CC1 configuration channel and Pin 4 of the CC2 configuration channel of interface J1 are connected to pull-down resistors R6 and R7, respectively, with the other ends of resistors R6 and R7 both grounded. By detecting the voltage values ​​of CC1 and CC2, functions such as cable connection and removal and socket / plug orientation can be identified; Pins 1, 6, 7, and 8 of interface J1 are all grounded. The battery boost charging circuit identifies the USB voltage through the charging communication module.

[0227] Capacitors C10 and C11 are connected to the USB voltage VBUS at one end and grounded at the other end to filter current, stabilize voltage, and avoid voltage spikes. The USB voltage VBUS is grounded through a discharge resistor R8 to avoid unnecessary power consumption.

[0228] As shown in Figure 6-5 of the specification:

[0229] In one embodiment, the battery boost charging circuit is further provided with circuit transfer interfaces BD, P1, and P2 for transferring circuit signals of the portable fan.

[0230] Interface BD is connected to the dip switch, receives the P_EN enable signal of the dip switch, and transmits it to the main control chip of the portable fan through interface P2 to control the locking or operation of the portable fan.

[0231] The interface P1 receives the gear adjustment signals KEY, KEY_X, and KEY_Y of the portable fan, and transmits them to the main control chip of the portable fan through the interface P2 to control the start and stop and gear adjustment of the portable fan.

[0232] Interface P2 also receives the VBAT battery voltage, USB voltage VBUS, and PG signal transmitted by the charging chip U1, and transmits them to the main control chip of the portable fan.

[0233] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A fan, wherein: include: The neck hanging shell includes a connecting section and neck side sections respectively connected to both sides of the connecting section, and the connecting section and the two neck side sections are jointly arranged to form a neck hanging space; a hair dryer is provided on the connecting section and / or at least one of the neck side sections, and each hair dryer is used to blow air in the direction of the neck hanging space.

2. The fan according to claim 1, wherein The hair dryer part includes a positioning boss, a rotating fan blade and a three-phase motor drive assembly connected to the rotating fan blade. The three-phase motor drive assembly includes a stator and a rotor sleeved outside the stator. The rotor is fixedly mounted on the rotating fan blade and is coaxially arranged with the rotating fan blade. The stator is fixedly sleeved on the positioning boss.

3. The fan according to claim 2, wherein The connecting section is provided with a hair dryer, a first air guide cavity is provided in the connecting section, a first air outlet connected to the first air guide cavity is provided on the connecting section, the first air outlet is oriented in the direction of the neck hanging space, the positioning boss is provided in the first air guide cavity, and the rotating fan blade is rotatably installed in the first air guide cavity for blowing air toward the first air outlet; The connecting section is provided with a first air inlet communicating with the first air guide cavity, the first air inlet faces the end of the rotating fan blade, and the first air outlet faces the side of the rotating fan blade; A plurality of first air guide ribs are arranged in the connecting section, and the plurality of first air guide ribs are arranged to form the first air guide cavity. There are a plurality of first air outlets, and the plurality of first air outlets are arranged at intervals along the extension direction of the connecting section. The end of the first air guide cavity is connected to the plurality of first air outlets.

4. The fan according to claim 2, wherein A fixing hole is provided on the rotating fan blade, and the axis of the fixing hole is collinear with the axis of the rotating fan blade. The hair dryer part also includes a rotating shaft, and the first end of the rotating shaft is fixedly inserted into the fixing hole; a positioning hole is provided inside the positioning boss, and the axis of the positioning hole is collinear with the axis of the rotating shaft, and the second end of the rotating shaft is rotatably inserted into the positioning hole.

5. The fan according to claim 4, wherein At least one of the hair dryer parts includes a bearing part, the outer ring of the bearing part is fixed in the positioning hole, and the inner ring of the bearing part is sleeved on the second end of the rotating shaft; the bearing part includes a rolling bearing, and the hair dryer part also includes a limit member, the limit member is installed on the second end of the rotating shaft, and the bearing part is located between the limit member and the first end of the rotating shaft; there are multiple bearing parts, and an inner flange is provided on the inner side wall of the positioning hole, and the inner flange is arranged between two adjacent bearing parts so that the two adjacent bearing parts are spaced apart; or, the bearing part includes a sliding bearing, and the hair dryer part also includes two sealing rings, both of which are sleeved on the rotating shaft and are respectively located on both sides of the sliding bearing. The fan according to claim 2 , wherein: The two neck side sections are each provided with a hair dryer, a second air guide cavity is provided in the neck side section, and a second air outlet communicating with the second air guide cavity is provided on the neck side section, the second air outlet faces the direction of the neck hanging space, the positioning boss is provided in the second air guide cavity, and the rotating fan blade is rotatably installed in the second air guide cavity for blowing air toward the second air outlet; The neck side section is provided with a second air inlet connected to the second air guide cavity, the second air inlet faces the end of the rotating fan blade, and the second air outlet faces the side of the rotating fan blade.

7. The fan according to claim 1, wherein It also includes a power supply unit, which is installed in the neck hanging shell and is electrically connected to each of the hair dryer units. A charging port is provided on the neck hanging shell, and the charging port is electrically connected to the power supply unit.

8. A control circuit for a neck-hanging fan, wherein: include: a charging and power supply circuit, used to electrically connect an external power source and a battery to receive an external voltage to charge the battery and output a supply voltage; a fan driving circuit, electrically connected to the charging and power supply circuit and the fan, and configured to drive the fan to rotate; as well as The main control circuit is electrically connected to the charging and power supply circuit and the fan driving circuit.

9. The control circuit of the neck-hanging fan according to claim 8, wherein: The charging and power supply circuit includes a charging port and a charging management chip, wherein a power supply terminal of the charging port receives the external voltage and is electrically connected to a charging input pin of the charging management chip, the power supply terminal of the charging port is also electrically connected to a negative electrode of a voltage regulator tube, the positive electrode of the voltage regulator tube is grounded, a switch pin of the charging management chip is used to electrically connect to the positive electrode of the battery via a first inductor, a boost output pin of the charging management chip is used to output the supply voltage, and the boost input pin of the charging management chip is connected to a node between the battery and the first inductor via a first connection resistor on the one hand, and to ground via a first grounding capacitor on the other hand; The key input terminal of the charging management chip is electrically connected to the main control circuit; The first LED driving pin of the charging management chip is grounded via the first grounding resistor and the second grounding resistor in sequence, and the second LED driving pin of the charging management chip is connected to the battery via the second connection resistor; the first indicator light pin of the main control circuit is grounded via the first indicator light branch, and the second LED driving pin of the charging management chip is connected to the battery via the second connection resistor; The active pin is also grounded via a second indicator light branch, and both the first indicator light branch and the second indicator light branch include a current limiting resistor and an indicator light connected in series.

10. The control circuit of the neck-hanging fan according to claim 8, wherein: The refrigeration control circuit is connected to the refrigeration element and the charging and supply circuit, and is used to drive the refrigeration element to refrigerate. The refrigeration control circuit includes a first control switch, a first conductive end of the first control switch is used to receive the output voltage of the battery or the supply voltage via the refrigeration element, and a second conductive end of the first control switch is grounded; The main control circuit is electrically connected to the refrigeration control circuit, and is used to output a first pulse width control signal to control the on and off of the first control switch, thereby controlling the intermittent on and off of the refrigeration element.

11. The control circuit of the neck-hanging fan according to claim 8, wherein: The control circuit also includes a second control switch, wherein a first conduction end of the second control switch is used to electrically connect to the battery to receive the output voltage of the battery, a control end of the second control switch is used to receive the external voltage and is grounded, and a second conduction end of the second control switch is electrically connected to the fan drive circuit, and the second control switch is closed when receiving the external voltage and is turned on when not receiving the external voltage.

12. The control circuit of the neck-hanging fan according to claim 11, wherein: The control end of the second control switch is grounded via a third grounding resistor and electrically connected to the second conducting end of the second control switch and the fan driving circuit via a first diode, wherein the second control switch is a PMOS field effect transistor; The control end of the first control switch is electrically connected to the first pulse width signal output end of the main control circuit via a third connection resistor, and the node between the control end of the first control switch and the third connection resistor is also grounded via a fourth connection resistor; the first control switch is an NMOS field-effect transistor, and the cooling element also receives the output voltage of the battery or the supply voltage via a fifth connection resistor.

13. The control circuit of the neck-hanging fan according to claim 8, wherein: The control circuit also includes an encoder, which is respectively connected to the positive pole and ground of the battery. The two output ends of the encoder are also respectively connected to the main control circuit. The encoder has a stepless control knob for user operation. The user operates the stepless control knob to make the two output ends of the encoder output multiple different digital signals. The main control circuit is used to control the first control switch according to the digital signal to control the cooling intensity of the refrigeration element or control the fan drive circuit according to the digital signal to control the speed of the fan.

14. The control circuit of the neck-hanging fan according to claim 8, wherein: The fan drive circuit includes a second inductor, a third control switch, a second diode and a boost feedback branch, one end of the second inductor is used to electrically connect to the charging and power supply circuit to receive the external voltage or the supply voltage, the other end of the second inductor is connected to the fan via the second diode, the first conductive end of the third control switch is connected to the node between the second inductor and the second diode, the second conductive end of the third control switch is grounded, the control end of the third control switch is electrically connected to the main control circuit to receive the second pulse width control signal output by the main control circuit, one end of the boost feedback branch is connected to the node between the second diode and the fan, the other end of the boost feedback branch is grounded, the boost feedback branch includes a first voltage divider resistor and a second voltage divider resistor connected in series, the node between the first voltage divider resistor and the second voltage divider resistor is connected to the main control circuit via the third voltage divider resistor, and the node between the third voltage divider resistor and the main control circuit is also grounded via a second grounding capacitor.

15. The control circuit of the neck-hanging fan according to claim 8, wherein: The fan drive circuit also includes a fourth control switch, a third diode, a first feedback resistor, and a second feedback resistor. The cathode of the third diode is connected to the anode of the fan, the cathode of the fan is connected to the anode of the third diode and the first conduction end of the fourth control switch, the control end of the fourth control switch is electrically connected to the fan enable end of the main control circuit, the second conduction end of the fourth control switch is grounded via the first feedback resistor, the node between the second conduction end of the fourth control switch and the first feedback resistor is also electrically connected to the load feedback end of the main control circuit via the second feedback resistor, and the node between the second feedback resistor and the main control circuit is also grounded via a third grounding capacitor.

16. A motor drive control circuit for a portable fan, wherein: include: 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, wherein the motor drive control circuit of the portable fan comprises at least one of a motor drive control unit, a motor drive circuit, and a rotor position detection circuit (600).

17. The motor drive control circuit according to claim 16, wherein: A permanent magnet is provided on the rotor of the motor, and a first winding, a second winding, and a third winding are provided on the stator of the motor in a Y-type connection; a MOS transistor switch circuit of the motor drive circuit is connected to the first winding, the second winding, and the third winding of the motor, and the motor drive control unit controls the current magnitude, flow direction, or phase relationship of each phase winding; The motor drive circuit includes: a first MOS transistor switch having one end connected to a power supply voltage and the other end connected to the first winding, wherein the conduction of the first MOS transistor switch is controlled by a second MOS transistor switch; a second MOS transistor switch having one end connected to the power supply voltage via a first resistor and the other end connected to ground; and the second MOS transistor switch receiving a pulse modulation control signal from the motor drive control unit.

18. The motor drive control circuit according to claim 17, wherein: include: The motor drive circuit further includes: a third MOS transistor switch having one end connected to the first winding and the other end connected to the ground via a current sampling resistor, and the third MOS transistor switch receives a pulse modulation control signal from the motor drive control unit.

19. The motor drive control circuit according to claim 18, wherein: include: A reverse diode is provided on the MOS tube switch; The first MOS transistor switch is a P-type MOS transistor, and the second and third MOS transistor switches are N-type MOS transistors; 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.

20. The motor drive control circuit according to claim 19, wherein: include: The motor drive circuit further includes: a MOS transistor switch circuit composed of fourth, fifth, and sixth MOS transistor switches and fourth, fifth, and sixth resistors, which controls the inflow and outflow of the second winding current; A MOS transistor switch circuit composed of the seventh, eighth, and ninth MOS transistor switches and the seventh, eighth, and ninth resistors controls the inflow and outflow of the third winding current; 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; 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.

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