Fan, control circuit of a neck-hanging fan, and motor drive circuit of a portable fan Portable fan

Abstract

A fan including a housing, the housing including a connection part and neck side parts connected to both sides of the connection part, the connection part and the two neck side parts together enclosing to form a neck hanging space, an electric exhaust part being installed on the connection part and / or at least one of the neck side parts, and each electric exhaust part being used to blow air into the neck hanging space.

Description

Technical Field

[0001] This application relates to the field of fan technology, and more particularly to fans, control circuits for neck-mounted fans, and motor drive circuits for portable fans.

Background Art

[0002] An electric fan, also called a fan or a ventilator, is a household appliance that uses an electric motor to rotate a fan blade and mainly promotes air circulation. It is mainly used to cool and circulate air and is widely used in homes, classrooms, offices, stores, hospitals, hotels, etc. Currently, commercially available electric fans are divided into two types: household electric fans and industrial ventilation fans according to their applications. Household electric fans include ceiling fans, table fans, floor fans, wall-mounted fans, ceiling fans, ventilation fans, rotary fans, air-conditioning fans, etc.

[0003] However, currently commercially available small fans need to be held by hand when in use, and other operations cannot be performed with the hand holding the fan during air blowing, which is inconvenient to use.

Summary of the Invention

[0004] The main object of this application is to provide a fan, which includes a neck-mounted housing. The neck-mounted housing includes a connecting portion and neck-side portions respectively connected to both sides of the connecting portion. The connecting portion and the two neck-side portions together enclose to form a neck-mounted space. An electric exhaust portion is provided on the connecting portion and / or at least one neck-side portion. Each electric exhaust portion is used to blow air towards the neck-mounted space.

Brief Description of the Drawings

[0005] In this application, embodiments will be described with reference to the accompanying drawings. The drawings of this application are only used to explain the embodiments and are for illustrative purposes only. Without departing from the principles of this application, those skilled in the art can easily create other embodiments according to the steps described in the following description.

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Embodiments for Carrying Out the Invention

[0006] In order to more clearly illustrate the technical problems, technical solutions, and beneficial effects solved by the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are used only for explaining the present application and are not used for limiting the present application.

[0007] Note that when an element is described as "fixed to" or "arranged on" another element, it can be either directly connected to the other element or indirectly connected to the other element. When an element is described as "connected to" another element, it may be directly connected to the other element or indirectly connected. The embodiments and features of the embodiments of the present application can be combined with each other without contradiction. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments.

[0008] The orientation and positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "upper", "bottom", "inner", "outer", etc. are based on the orientation and positional relationship shown in the drawings, and are for the convenience of the description and simplification of the description of the present application, and are not intended to imply or suggest that the device or element mentioned must have a specific orientation and must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

[0009] The terms "first" and "second" in the present application are used only for the purpose of description, and should not be construed as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "a plurality" means two or more unless otherwise clearly and specifically defined.

[0010] Example 1 is shown in FIGS. 1-1 to 1-10.

[0011] Referring to FIGS. 1-1 to 1-10, according to one aspect of the present application, in the embodiments of the present application, a fan is provided. The fan includes a housing 10. The housing 10 includes a connecting portion 11 and neck-side portions 12 connected to both sides of the connecting portion 11. The connecting portion 11 and the two neck-side portions 12 enclose to form a neck-hanging space 13. An electric exhaust portion 20 is provided on the connecting portion 11 and / or the neck-side portions 12. Each electric exhaust portion 20 is used to blow air in the direction of the neck-hanging space 13. The fan provided in this embodiment forms the neck-hanging space 13 by jointly enclosing the connecting portion 11 and the two neck-side portions 12 by installing two neck measurement portions on both sides of the connecting portion 11, and the user can hang the fan provided in this embodiment on the body through the neck-hanging space 13, thereby effectively liberating the user's hands. At the same time, by providing the electric exhaust portion 20 on the connecting portion 11 and / or at least one neck-side portion 12, the fan provided in this embodiment can blow air into the neck-hanging space 13, so that the user can obtain a good cooling experience.

[0012] Since the currently commercially available portable fans are driven by single-phase motors, the wind power is small and the cooling effect is low, and they cannot provide users with an excellent usage experience.

[0013] Referring to FIGS. 1-3 to 1-10, in order to solve the above problems, the electric exhaust portion 20 of this embodiment includes a positioning stud 21, a rotating blade 22, and a three-phase motor drive assembly 23 drivingly connected to the rotating 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 installed on the rotating blade 22 and is arranged coaxially with the rotating blade 22. The stator 231 is fixedly sleeved on the positioning stud 21. By using the three-phase motor drive assembly 23 to drive the rotating blade 22 provided in this embodiment, the electric exhaust portion 20 provided by the present application can output a larger wind power to the neck-hanging space 13, effectively improving the cooling experience of the user.

[0014] Referring to FIGS. 1-3 to FIGS. 1-5, in a specific embodiment, an electric exhaust part 20 is provided in the connection part 11 of this embodiment, and a first air guiding cavity 111 is provided in the connection part 11. A first air outlet 112 communicated with the first air guiding cavity 111 is installed in the connection part 11. The first air outlet 112 faces the direction of the neck hanging space 13. A positioning stud 21 is provided in the first air guiding cavity 111. The rotating blade 22 is rotatably installed in the first air guiding cavity 111 and is used to blow air out of the first air outlet 112.

[0015] In a preferred embodiment, the rotating blade provided in this embodiment is a radial fan.

[0016] Referring to FIGS. 1-1 to FIGS. 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 communicated with the first air guiding cavity 111 is provided in the connection part 11 of this embodiment. The first air inlet 113 faces the end of the rotating blade 22, and the first air outlet 112 faces the side surface of the rotating blade 22. By installing the first air inlet 113 facing the end of the rotating blade 22 and the first air outlet 112 facing the side part of the rotating blade 22 in the connection part 11 provided by this embodiment, the fan provided by this embodiment can effectively send the external air to the neck hanging space 13, so that the user can obtain a better cooling effect.

[0017] Referring to FIGS. 1-7 to FIGS. 1-10, in a specific embodiment, a fixing hole 221 is provided in the rotating blade 22 of this embodiment. The axis of the fixing hole 221 is on the same straight line as the axis of the rotating blade 22. The electric exhaust part 20 includes a rotating shaft 24. The first end of the rotating shaft 24 is inserted into the fixing hole 221 and fixed. A positioning hole 211 is provided inside the positioning stud 21, and the axis of the positioning hole 211 is on the same straight line as the axis of the rotating shaft 24. The second end of the rotating shaft 24 is rotatably inserted into the positioning hole 211.

[0018] Referring to FIGS. 1-3 to 1-5, in order to improve the cooling effect of the fan provided in this embodiment, in this embodiment, a plurality of first air guiding ribs 114 are provided on the connecting portion 11, and the plurality of first air guiding ribs 114 surround the first air guiding cavity 111. There are a plurality of first air outlets 112. The plurality of first air outlets 112 are installed at intervals along the extending direction of the connecting portion 11. The end of the first air guiding cavity 111 communicates with the plurality of first air outlets 112. By arranging a plurality of the first air outlets 112 provided in this embodiment and arranging the plurality of first air outlets 112 at intervals along the extending direction of the connecting portion 11, the end of the first air guiding cavity 111 is simultaneously communicated with the plurality of first air outlets 112. Due to the action of the electric exhaust portion 20, the air in the guide cavity is evenly sent out from the plurality of first air outlets 112 to the neck-hanging space 13, and the cooling effect of the fan provided in this embodiment is effectively improved.

[0019] Referring to FIGS. 1-7 to 1-10, the rotating blade 22 provided in this embodiment is driven by a relatively high-speed three-phase motor assembly. In order to avoid rapid wear between the rotating shaft 24 and the positioning hole 211 due to high-speed rotation and ensure the service life of the fan provided in this embodiment, in this embodiment, at least one electric exhaust portion 20 includes a bearing portion 25. The outer ring of the bearing portion 25 is fixed to the positioning hole 211, and the inner ring of the bearing portion 25 is sleeved on the second end of the rotating shaft 24. By fixing the outer ring of the bearing portion 25 provided in this embodiment to the positioning hole 211, the inner ring is sleeved on the second end portion of the rotating shaft 24, whereby the friction between the positioning hole 211 and the rotating shaft 24 can be converted from sliding friction to the friction inside the bearing portion 25, and the wear of the positioning hole 211 and the rotating shaft 24 can be effectively prevented, and the service life of the electric exhaust portion 20 provided in this embodiment can be effectively improved.

[0020] Referring to FIGS. 1-7 and 1-8, in a specific embodiment, the bearing portion 25 includes a rolling bearing 251, and the electric exhaust portion 20 also includes a limiting member 26. The limiting member 26 is installed at the second end of the rotating shaft 24. The bearing portion 25 is located between the limiting member 26 and the first end of the rotating shaft 24. The number of the bearing portions 25 is plural, and an inner flange 2111 is provided on the inner wall of the positioning hole 211. The inner flange 2111 is installed between two adjacent bearing portions 25, whereby the two adjacent bearing portions 25 are installed at intervals. Through the limiting member 26 installed at the second end of the rotating shaft 24 provided in this embodiment and the inner flange 2111 provided on the inner wall of the positioning hole 211, the inner ring and the outer ring of the rolling bearing 251 provided in this embodiment can be effectively positioned, so that the rolling bearing 251 provided in this embodiment can be effectively installed.

[0021] In a preferred embodiment, the electric exhaust portion 20 provided in this embodiment further includes an elastic member. The elastic member provided in the embodiment is disposed between the rolling bearing 251 close to the rotating blade 22 and the rotating blade 22, and is sleeved on the rotating shaft 24. Both ends of the elastic member provided in this embodiment are respectively abutted against the inner ring of the rolling bearing 251 and the rotating blade 22, and an elastic force is applied to the inner ring of the rolling bearing 251 in a direction away from the air outlet. By the elastic member provided in this embodiment, the rolling bearing 251 can be pre-tightened, thereby effectively extending the service life of the rolling bearing 251.

[0022] 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.

[0023] In a preferred embodiment, the bearing portion 25 provided in this embodiment is a ceramic bearing, and lubricating oil is installed in the ceramic bearing provided in this embodiment.

[0024] In a preferred embodiment, the bearing portion 25 provided in this embodiment is a magnetic levitation bearing.

[0025] Referring to FIGS. 1-9 and 1-10, in another embodiment, the bearing portion 25 includes a sliding bearing 252, and the electric exhaust portion 20 includes two seal rings 27. The two seal rings 27 are sleeved on the rotating shaft 24 and are respectively arranged on both sides of the sliding bearing 252. The sliding bearing 252 provided in this embodiment is arranged between the rotating shaft 24 and the positioning hole 211. By fixing the inner ring of the sliding bearing 252 to the second end of the rotating shaft 24 and fixing the outer ring to the positioning hole 211, the friction between the rotating shaft 24 and the positioning hole 211 can be converted into the friction between the inner ring and the outer ring of the sliding bearing 252, effectively avoiding the wear of the rotating shaft 24 and the positioning hole 211, thereby improving the service life of the fan provided by this embodiment.

[0026] In a preferred embodiment, lubricating oil is installed in the sliding bearing 252 provided in this embodiment. The seal ring 27 provided in this embodiment is sleeved on the rotating shaft 24 and is arranged on both sides of the sliding bearing 252, and is used to seal the lubricating oil.

[0027] Referring to FIGS. 1-6 to 1-10, in a specific embodiment, electric exhaust portions 20 are installed on both of the two neck side portions 12 of this embodiment, and a second air guiding cavity 121 is provided in the neck side portion 12. The neck side portion 12 is provided with a second air outlet 122 communicating with the second air guiding cavity 121. The second air outlet 122 faces the direction of the neck hanging space 13, a positioning boss 21 is provided in the second air guiding cavity 121, and the rotating blade 22 is rotatably installed in the second air guiding cavity 121 and is used to blow air out of the second air outlet 122.

[0028] Referring to FIGS. 1-7 to 1-10, in a specific embodiment, a second air inlet 123 communicating with the second air guiding cavity 121 is provided in the neck side portion 12 of this embodiment. The second air inlet 123 faces the end of the rotating blade 22. The second air outlet 122 faces the side portion of the rotating blade 22.

[0029] In a preferred embodiment, there are a plurality of second air outlets 122 provided in this embodiment. The plurality of second air outlets are installed at intervals along the extending direction of the neck side portion 12.

[0030] In an optional embodiment, an electric exhaust part 20 is provided on one of the two neck side portions 12 provided in this embodiment, and a bearing part 25 is provided on the electric exhaust part 20 provided in this embodiment.

[0031] In an optional embodiment, an electric exhaust part 20 is provided on one of the connecting part 11 and the two neck side portions 12 provided in this embodiment, and a bearing part 25 is provided on the electric exhaust part 20 provided in this embodiment.

[0032] In an optional embodiment, electric exhaust parts 20 are provided on both the connecting part 11 and the two neck side portions 12 provided in this embodiment, and a bearing part 25 is provided on the electric exhaust part 20 provided in this embodiment.

[0033] Referring to FIGS. 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 of this embodiment also includes a power supply part 30, and the power supply part 30 is installed in the housing 10. The power supply part 30 is electrically connected to each electric exhaust part 20. A charging port 14 is provided on the housing 10, and the charging port 14 is electrically connected to the power supply part 30. By arranging the power supply part 30 in the housing 10 provided in this embodiment and electrically connecting the power supply part 30 to each electric exhaust part 20, the fan provided in this embodiment can blow air without being connected to an external power source, improving the versatility of the fan according to this embodiment. Moreover, by providing a charging port 14 electrically connected to the power supply part 30 on the housing 10 provided in this embodiment, the power supply part 30 provided in this embodiment can be connected to an external power source via the charging port 14, realizing the charging of the power supply part 30.

[0034] In a preferred embodiment, the power supply part 30 provided in this embodiment is a battery.

[0035] In a preferred embodiment, a filter is provided at at least one of the first air inlet 113 and the first air outlet 112 provided in this embodiment. By installing a filter at at least one of the first air inlet 113 and the first air outlet 112, it is possible to effectively prevent foreign matters in the external environment from entering the fan according to this embodiment.

[0036] In a preferred embodiment, a filter is provided at at least one of the second air inlet 123 and the second air outlet 122 provided in this embodiment. By installing a filter at at least one of the second air inlet 123 and the second air outlet 122, it is possible to effectively prevent foreign matters in the external environment from entering the fan according to this embodiment.

[0037] In a preferred embodiment, the fan provided in this embodiment further includes a gel accommodating portion, and the gel accommodating portion is detachably provided in the first air guiding cavity 111 and / or the second air guiding cavity 121 provided in this embodiment. The gel accommodating portion provided in this embodiment is used to accommodate a gel fragrance agent. By arranging the gel fragrance agent in the gel accommodating portion provided in this embodiment, the air blown out by the fan provided in this embodiment is scented, providing a better experience for customers.

[0038] In a preferred embodiment, the gel accommodating part provided in this embodiment includes a box body and a cover assembly attached to the box body. The box body provided in this embodiment is removably attached to the first air guiding cavity 111. A accommodating cavity is provided in the box body provided in this embodiment, and this accommodating cavity is used to accommodate the gel air freshener. The cover assembly provided in this embodiment includes a first cover plate and a second cover plate. The first cover plate provided in this embodiment is removably attached to the box body, and the second cover plate provided in this embodiment is pivotally connected to the first cover plate. The first cover plate provided in this embodiment has a first opening, and the second cover plate provided in this embodiment has a second opening. The second cover plate provided in this embodiment has a shielding state in which the first opening is completely blocked and an open state in which the first opening and the second opening overlap. By rotating the second cover plate, the second cover plate can be switched between the shielding state and the open state.

[0039] In summary, the fan provided by this embodiment has at least the following advantageous technical effects. By installing two neck measurement parts on both sides of the connection part 11 respectively, the connection part 11 and the two neck side parts 12 can together surround to form a neck hanging space 13, and the user can hang the fan provided in this embodiment on the body through the neck hanging space 13, effectively liberating the user's hands. At the same time, by arranging the electric exhaust part 20 on the connection part 11 and / or at least one neck side part 12, the fan provided in this embodiment can blow air into the neck hanging space 13, and the user can obtain a good cooling experience.

[0040] Embodiment 2 is shown in FIGS. 2-1 to 2-7.

[0041] Referring to FIGS. 2-1 and 2-2, the present application provides a neck-mounted fan 10. The neck-mounted fan 10 includes a housing 11, a fan 12, a refrigeration 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 disposed within the housing 11. The fan 12 is used to direct air from the air inlet 111 to the air outlet 112. The refrigeration element 13 is disposed in the housing 11. The neck-mounted fan 10 may also include a temperature conduction element 16. One side of the temperature conduction element 16 is used to approach the user's neck, and the other side of the temperature conduction element 16 is used to contact the refrigeration element 13.

[0042] Referring to FIGS. 2-3 to 2-7, the control module 15 includes a control circuit. The control circuit is disposed on a circuit board. The control circuit can include a charging power supply circuit 20, a fan driving circuit 30, a refrigeration control circuit 40, and a main control circuit 50.

[0043] The charging power supply circuit 20 is used to electrically connect an external power source to the battery 14, thereby receiving an external voltage VCC, charging the battery 14, and outputting a power supply voltage V0. The fan driving circuit 30 is electrically connected to the charging power supply circuit 20 and the fan 12, and is used to rotationally drive the fan 12.

[0044] The refrigeration control circuit 40 is electrically connected to the refrigeration element 13 and the charging power supply circuit 20, and is used to cool and drive the refrigeration element 13. The refrigeration control circuit 40 includes a first control switch Q1. The first conduction terminal of the first control switch Q1 is used to receive the output voltage of the battery 14 or the power supply voltage through the refrigeration element 13 (in this embodiment, an example of mainly receiving the output voltage of the battery 14 will be described). The second conduction terminal of the first control switch Q1 is grounded.

[0045] 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 used to output a first pulse width control signal for controlling the on / off of the first control switch Q1, and further controls the intermittent on and off of the refrigeration element 13. Specifically, the first pulse width signal output terminal C_PWM of the main control circuit 50 is electrically connected to the control terminal of the first control switch Q1 and is used to output the first pulse width control signal.

[0046] Compared with the prior art, in the control circuit of the hanging fan provided by the embodiment of the present application, the refrigeration control circuit 40 having the first control switch Q1 receives the first pulse width control signal output by the main control circuit 50, thereby controlling the intermittent opening and closing of the refrigeration element 13, improving the discomfort of the user caused by the too low temperature due to long-term operation, and improving the user experience. In addition, the above-mentioned refrigeration control circuit 40 has a simple structure, is easy to implement, and has high reliability.

[0047] In this embodiment, as shown in FIG. 2-2, the charging and power supply circuit 20 includes a charging port 21 and a charging management chip 22. The power terminal 211 of the charging port 21 receives an external voltage VCC and is electrically connected to the charging input pin VIN of the charging management chip 22. The power terminal 211 of the charging port 21 is also electrically connected to the negative electrode of the voltage stabilizing tube D1, and the positive electrode of the voltage stabilizing tube D1 is grounded. The switch pin SW of the charging management chip 22 is used to electrically connect the positive electrode BAT+ of the battery 14 through the first inductor L1. The boost output pin VOUT of the charging management chip 22 is used to output the power 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 through the first connection resistor 201 on the one hand and is grounded through the first ground capacitor 202 on the other hand. Through the charging management chip 22, the voltage stabilizing tube D1 and the first inductor L1, the charging and discharging of the charging port and the battery can be effectively managed, and the power supply voltage required by other circuits can be output. The structure is simple, the implementation is easy, and the safety is high.

[0048] The key input terminal KEY of the power management chip 22 is electrically connected to the main control circuit 50, and the first LED driving pin LED1 of the charging management chip 22 is grounded through the first ground resistance 203 and the second ground resistance 204. The second LED driving pin LED2 of the charging management chip 22 is connected to the positive electrode of the battery 14 through the second connection resistance 205. The first indicator light pin LED1 of the main control circuit 50 is grounded through the first indicator light branch 51, and the second LED driving pin LED2 of the charging management chip 22 is grounded through the second indicator light branch 23. Both the first indicator light branch 51 and the second indicator light branch 23 include a current limiting resistor R and an indicator light LED connected in series. The key input terminal SW of the charging management chip 22 is electrically connected to the main control circuit 50, and it can be seen that the main control circuit 50 can control the charging management chip 22 to ensure the reliability of the control circuit. The first indicator light branch 51 and the second indicator light branch 23 can display the charging state of the charging power supply circuit 20 and improve the user experience. The main control circuit 50 may be an MCU.

[0049] As shown in FIGS. 2 to 4, in the refrigeration control circuit 40, the control terminal of the first control switch Q1 is electrically connected to the first pulse width signal output terminal C_PWM of the main control circuit 50 through the third connection resistance 207. The node between the control terminal of the first control switch Q1 and the third connection resistance 207 is also grounded through the fourth connection resistance 208. The first control switch Q1 is an NMOS (N-Metal-Oxide-Semiconductor), and the refrigeration element 13 receives the output voltage of the battery 14 or the power supply voltage through the fifth connection resistance 209. It can be understood that the stability and safety of the control circuit can be improved by the third connection resistance 207 and the fourth connection resistance 208. The first control switch Q1 is an NMOS, which also has the technical effects of low cost, simple structure and control technology. The refrigeration element 13 directly receives the output voltage MVCC of the battery 14, can obtain a relatively direct and stable power supply, and is advantageous for improving the stability of the control circuit.

[0050] As shown in FIGS. 2-3 and 2-5, the control circuit further includes a second control switch Q2. The first conduction terminal of the second control switch Q2 is used to electrically connect the positive electrode BAT+ of the battery 14, thereby receiving the output voltage of the battery 14. The second conduction terminal of the second control switch Q2 is used to electrically connect the positive electrode of the refrigeration element 13. The control terminal of the second control switch Q2 is used to receive the external voltage VCC and is grounded, and is electrically connected to the second conduction terminal of the second control switch Q2 and the fan drive circuit 30. The second control switch Q2 is turned off when the external voltage VCC is received, and is turned on when the external voltage VCC is not received. At this time, the fan drive circuit 30 is powered by the battery 14. When the external voltage VCC is connected via the second control switch Q2, the external voltage VCC can directly supply power to the fan drive circuit 30, preventing the fan drive circuit 30 from using the output power of the battery 14. Thereby, not only can the battery 14 be charged faster, but also the problem of affecting the service life of the battery 14 caused by charging and discharging can be avoided.

[0051] As shown in FIG. 3, the control terminal of the second control switch Q2 can be grounded via a third grounding resistor 206, and can be connected to the second conductive terminal of the second control switch Q2 and the fan drive circuit 30 via a first diode D2. It is understood that the stability and safety of the control circuit can be improved by the third grounding resistor 206 and the first diode D2. The second control switch Q2 is a PMOS (P-Metal-Oxide-Semiconductor) field effect transistor. The second control switch Q2 is a PMOS field effect transistor, which also has the technical effects of low cost, simple structure and control.

[0052] As shown in FIG. 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 the charging power supply circuit 20 to receive the external voltage VCC or the output voltage MVCC of the battery 14, and the other end of the second inductor L2 is connected to the fan 12 via the second diode D3. The first conduction terminal of the third control switch Q3 is connected to the node between the second inductor L2 and the second diode D3, and the second conduction terminal of the third control switch Q3 is grounded. The control terminal of the third control switch Q3 is electrically connected to the second pulse width signal output terminal FPWM of the main control circuit 50 so as to receive 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 connected. 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, and the node between the third voltage dividing resistor 313 and the main control circuit 50 is grounded via a second grounding capacitor 314. According to the fan drive circuit 30 having such a configuration, the second inductor L2 can be charged and discharged by the switching control of the third control switch Q3, the voltage on the right side of the second inductor L2 can be increased, and power can be supplied to the fan 12. The boost feedback branch 31 also samples the boosted voltage and feeds it back to the main control circuit 50, whereby the main control circuit 50 can adjust the second pulse width control signal supplied to the third control switch Q3, and the voltage obtained by the fan 12 is basically constant. Furthermore, by adjusting the second pulse width control signal supplied to the third control switch Q3, the voltage supplied to the fan 12 can also be increased or decreased, whereby the fan 12 can be controlled to reach different rotational speeds.

[0053] Furthermore, the fan driving circuit 30 may also include a fourth control switch Q4, a third diode D4, a first feedback resistor 315, and a second feedback resistor 316. The negative electrode of the third diode D4 is connected to the positive electrode of the fan 12. The negative electrode of the fan 12 is connected to the positive electrode of the third diode D4 and the first conduction terminal of the fourth control switch Q4, and the control terminal of the fourth control switch Q4 is electrically connected to the fan enable terminal FAEN of the main control circuit 50. The second conduction terminal of the fourth control switch Q4 is grounded through the first feedback resistor 315, and the node between the second conduction terminal of the fourth control switch Q4 and the first feedback resistor 315 is also electrically connected to the load feedback terminal LOAD AD of the main control circuit 50 through the second feedback resistor 316. The node between the second feedback resistor 316 and the main control circuit 50 is grounded through a third ground capacitor 317. The voltage boosted by the second inductor L2 and the third control switch Q3 is grounded through the fan 12 via the fourth control switch Q4 to form a loop, thereby rotationally driving the fan 12. The signal at the node between the second conduction terminal 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. Therefore, the main control circuit 50 can detect whether the fan 12 is blocked or the fan assembly 12 is short-circuited.

[0054] As shown in FIGS. 2 to 7, the control circuit also includes an encoder 60. The encoder 60 is connected to the positive electrode BAT+ of the battery 14 and is grounded. Two output terminals 611 and 612 of the encoder 60 are respectively connected to the main control circuit 50. The encoder 60 has a stepless control knob for user operation, and by operating the stepless control knob by the user, the two output terminals 611 and 612 can output a plurality of different digital signals. The main control circuit 50 is used to control the first control switch Q1 according to the digital signal to control the cooling intensity of the refrigeration element 13, or to control the fan drive circuit 30 according to the digital signal to control the rotation speed of the fan 12. As can be understood, through the encoder 60, a user can generate a plurality of different digital signals by operating the stepless control knob, and then can steplessly control the cooling intensity of the refrigeration element 13 or the rotation speed of the fan 12 based on the plurality of different digital signals, thereby improving the user experience.

[0055] Embodiment 3 is shown in FIGS. 3-1 to 3-7.

[0056] As shown in FIG. 3-1, the motor drive control circuit of the 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 Coverter) analog-to-digital converter power supply circuit 800, and a display unit 900.

[0057] The portable fan includes a hand-held fan, a neck-hanging fan, a wearable fan, a waist-hanging fan, a neck-hanging fan, a head-hanging fan, a desktop fan, a car fan, etc.

[0058] As shown in FIG. 3-2, the voltage stabilization unit 100 has a voltage stabilization chip U1. The power supply voltage VBAT is connected to the IN input pin of the voltage stabilization chip U1 via a current limiting resistor R1. One end of a filter capacitor C1 is connected to the IN input pin of the voltage stabilization chip U1, and the other end of the filter capacitor C1 is grounded. The OUT output pin of the voltage stabilization chip U1 outputs a VDD operating voltage to supply power to the main control chip U2 and the motor drive chip U3. The OUT output pin of the voltage stabilization chip U1 is grounded via a capacitor C2 to filter the current. The GND pin of the voltage stabilization chip U1 is grounded.

[0059] The voltage stabilization unit 100 is used to stabilize the power supply voltage and ensure a constant voltage output under different load conditions. It can automatically adjust the current according to the change of the power supply voltage, thereby ensuring that the output voltage does not change. The voltage stabilization unit 100 is used to stabilize a greatly fluctuating voltage source to prevent external environmental factors (such as temperature, humidity, etc.) from affecting the circuit.

[0060] As shown in FIG. 3-3, in one embodiment, the motor drive control unit 300, the motor drive circuit 400, and the rotor position detection circuit 600 cooperate to drive the operation of the motor 500.

[0061] The permanent magnet is arranged on the rotor of the motor 500, and the three windings U2, V2, W2 are arranged in a Y-shaped connection on the stator of the motor 500.

[0062] 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 each phase winding U2, V2, W2 of the motor 500 according to the control signal.

[0063] The motor drive circuit 400 includes capacitors C3, C4, C5. After the capacitors C3, C4, C5 are connected in parallel, one end is connected to the power supply voltage VBAT, and the other end is grounded, thereby filtering the current and stabilizing the voltage.

[0064] In one embodiment, the motor drive circuit 400 includes the following. One end of the MOS transistor switch Q1 is connected to the power supply voltage VBAT, the other end is connected to the winding U2, and the conduction of the MOS transistor switch Q1 is controlled by the MOS transistor switch Q4. One end of the MOS transistor switch Q4 is connected to the power supply voltage VBAT through the current limiting resistor R5, and the other end is grounded. The motor drive control unit 300 outputs the PWM_AH signal to the drain of the MOS transistor switch Q4 so as to control the conduction of the MOS transistor switch Q4. One end of the MOS transistor switch Q7 is connected to the winding U2, and the other end is grounded through the resistor R11. The motor drive control unit 300 outputs the PWM_AL signal to the drain of the MOS transistor switch Q7 so as to control the conduction of the MOS switch Q7. The MOS transistor switches Q1, Q4, and Q7 are provided with reverse diodes, which reverse-breakdown the diodes before the MOS transistors are damaged by overvoltage, preventing the MOS transistors from burning out.

[0065] Optionally, the MOS transistor switch Q1 is a P-type MOS transistor, and the MOS transistor switches Q4 and Q7 are N-type MOS transistors. The resistor R2 is connected to the drain and source of the MOS transistor switch Q4, and the resistor R8 is connected to the drain and source of the MOS transistor switch Q7, supplying a bias voltage to the field effect transistor, dissipating the static electricity between the gate and source of the MOS transistor, and protecting the MOS transistor.

[0066] The current control principle of the winding U2 is as follows.

[0067] A current flows through the winding U2. The motor drive control unit 300 outputs a low-level signal of PWM_AL to the drain of the MOS transistor switch Q7, and the MOS transistor switch Q7 is turned off. The motor drive control unit 300 outputs the PWM_AH signal to the drain of the MOS transistor switch Q4, the MOS transistor switch Q4 is turned on, 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, a low level is input, the MOS transistor switch Q1 is turned on, and a current flows through the winding U2.

[0068] Current flows out from winding U2. The motor drive control unit 300 outputs a low-level signal of PWM_AH to the drain of MOS transistor switch Q4, the MOS transistor switch Q4 turns off, the drain of MOS transistor switch Q1 is connected to a high level, the MOS transistor switch Q1 turns off, the motor drive control unit 300 outputs a PWM_AL signal to the drain of MOS switch Q7, the MOS switch Q7 turns on, and current flows out from winding U2.

[0069] In one embodiment, the MOS transistor switch circuit composed of MOS transistor switches Q2, Q5, Q8 and resistors R6, R3, R9 controls the inflow and outflow of current in winding V2, and its circuit structure and control principle are the same as those of the current control circuit of winding U2. The MOS transistor switch circuit composed of MOS transistor switches Q3, Q6, Q9 and resistors R7, R4, R10 controls the inflow and outflow of current in winding W2, and its circuit structure and control principle are the same as those of the current control circuit of winding U2.

[0070] In one embodiment, the motor overcurrent protection circuit includes the following. The current sampling resistor R11 is used to monitor the current flowing out from the motor 500, and 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. The motor drive control unit 300 converts the input voltage signal into a corresponding digital signal, thereby obtaining the 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, thereby filtering the current and stabilizing the voltage. After 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.

[0071] As shown in FIGS. 3-4 of the specification, 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 via the resistor R19. The winding U2 is connected to the BEMF_U pin of the motor drive control unit 300 via the resistor R14, and the other end of the resistor R14 is grounded via the resistor R19.

[0072] The BEMF back electromotive force output circuit composed of the resistors R15, R16, and R20 outputs the BEMF back electromotive force voltage signal of the winding V2, and its circuit configuration and control principle are the same as those of the BEMF back electromotive force output circuit of the winding U2. The BEMF back electromotive force output circuit composed of the resistors R15, R16, and R20 outputs the BEMF back electromotive force voltage signal of the winding W2, and its circuit configuration and control principle are the same as those of the BEMF back electromotive force output circuit of the winding U2.

[0073] The motor drive control unit 300 monitors the line voltage of the windings U2, V2, and W2 through the signals input from the BEMF_U, BEMF_V, and BEMF_W pins, calculates the back electromotive force of the rotor of the motor 500, and further calculates the position of the rotor of the motor 500.

[0074] The drive control principle of the motor 500 is as follows. The main control unit 200 outputs a motor start signal to the input terminal of the motor drive control unit 300. The motor drive control unit 300 outputs a motor drive signal to the gate of the MOS transistor of the motor drive circuit 400. The drive control unit 300 obtains the current position of the rotor of the motor 500 from the back electromotive force, controls the phase relationship of each phase output, energizes the corresponding two-phase windings each time, and the energization time of each phase winding is 120 electrical degrees. Thereby, a certain angle is formed between the direction of the stator magnetic flux and the direction of the rotor flux linkage, and the rotor of the motor 500 is rotationally driven.

[0075] As shown in FIGS. 3-5 of the specification, in one embodiment, the motor drive control unit 300 includes a motor drive chip U3. The VDD power 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 pin 12 of the motor drive chip U3, thereby filtering the current and stabilizing 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 gates of the MOS transistors 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 rotation speed information of the motor, and the ISENSE_IN pin 9 of the motor drive chip U3 receives the overcurrent protection signal.

[0076] As shown in FIGS. 3-6 and 3-7 of the specification, in one embodiment, the USB access circuit 700 includes the following. The USB voltage VBUS outputs a USBDET signal through the current limiting resistor R22. The positive electrode of the diode D2 is grounded, and the negative electrode is connected to the USB voltage VBUS through the resistor 22, thereby realizing overvoltage protection of the main control unit.

[0077] In one embodiment, the battery voltage detection analog-to-digital conversion circuit 800 includes the following. The battery voltage VBAT is grounded through the resistors R23 and R24, the 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.

[0078] In one embodiment, a switching interface P2 is provided in the motor drive control circuit of the portable fan. The switching interface P2 transmits the P_EN enable signal of the DIP switch and the gear adjustment signals KEY, KEY_X, and KEY_Y to the main control unit 200, and the VDD power supply supplies power to the mode switching roller through the current limiting resistors R25 and R26.

[0079] In one embodiment, the display unit 900 includes an SMG switch interface and a digital display screen. The SMG switch interface pins 1-5 are connected to the main control unit 200 via current limiting resistors R25 to R29, thereby receiving a display control signal and transmitting it to the digital display screen. On the digital display screen, the blowing temperature of the portable fan and the ratio of the fan power consumption are displayed according to the display control signal.

[0080] In one embodiment, the main control unit 200 includes a control chip U4, and the VDD power pin 1 of the control chip U4 is connected to the VDD operating voltage. The VDD power pin 1 of the control chip U4 is grounded via a voltage stabilizing capacitor C9, and 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, KEY_Y and transmit an indication of the operating status of the fan. Pin 5 of the control chip U4 outputs a motor operation pulse modulation signal PWN to the motor drive chip U3. Pin 8 of the control chip U4 receives the USBDET signal to determine the power status, pin 9 of the control chip U4 receives the analog-to-digital conversion voltage signal V_ADC, and pins 2 and 12-15 of the control chip U4 are connected to the display unit 900 to output a display control signal.

[0081] Example 4 is shown in FIGS. 4-1 to 4-24.

[0082] Referring to FIGS. 4-1 to 4-3, the first embodiment of the present application provides a fan drive circuit. The fan drive circuit can be used for multiple types of fans. Specifically, the fan drive circuit includes a main control circuit 11, a three-phase drive circuit 12, and a back electromotive force detection circuit 14.

[0083] The three-phase drive circuit 12 includes at least three signal input terminals 121 and three drive signal output terminals 122. At least three of the signal input terminals 121 are electrically connected to the main control circuit 11 respectively and receive control signals respectively. The three drive signal output terminals 122 are electrically connected to three signal terminals (U, V, W) of a DC brushless fan motor and output three-phase drive signals for driving the DC brushless fan motor to rotate respectively. The back electromotive force detection circuit 14 includes three detection branches 141. Each detection branch 141 includes a detection terminal 1411 and a detection output terminal 1412 electrically connected to the detection terminal. The three detection terminals 1411 of the three detection branches 141 are electrically connected to the three drive signal output terminals 122 respectively. The three detection output terminals 1412 of the three detection branches 141 are electrically connected to the main control circuit 11 respectively and are used to output a first detection signal, a second detection signal and a third detection signal to the main control circuit respectively. Thereby, the main control circuit 11 obtains the phase of the three-phase drive signal based on the first detection signal, the second detection signal and the third detection signal and adjusts the control signal.

[0084] Referring to FIG. 3, the detection branch 141 includes a first detection resistor R1, a second detection resistor R2 and a third detection resistor R3, and the first detection resistor R1 and the second detection resistor R1 are connected in series. One end of the first detection resistor R1 away from the second detection resistor R1 is the detection terminal 1411, one end of the second detection resistor R2 away from the first detection resistor R1 is grounded, and the node between the first detection resistor R1 and the second detection resistor R2 is the detection output terminal 1412.

[0085] The three-phase drive circuit 12 can improve the energy-saving performance and control performance of the fan motor, and can extend the service life of the fan drive circuit and the fan. Further, by means of the back electromotive force detection circuit 14 described above, the main control circuit 11 can easily obtain the phase of the DC brushless fan motor, transmit a corresponding control signal to the three-phase drive circuit 12, and effectively control the drive of the DC brushless fan motor, thereby improving the reliability and stability of the drive.

[0086] Referring to FIG. 4-2, the three-phase drive circuit 12 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6, a seventh transistor Q7, an eighth transistor Q8, and a ninth transistor Q9. The first conduction terminals 1211 of the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all connected to the power supply terminal 1212. The first conduction terminal 1211 of the fourth transistor Q4 is connected to the power supply terminal 1212, the first conduction terminal 1211 of the fifth transistor Q5 is connected to the power supply terminal 1212, the first conduction terminal 1211 of the sixth transistor Q6 is connected to the power supply terminal 1212, and the control terminals of the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 are electrically connected to the main control circuit 11 respectively. The control terminals of the seventh transistor Q7, the eighth transistor Q8, and the seventh transistor Q9 are electrically connected to the control terminals of the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 respectively and are used to receive control signals. The second conduction terminals 1213 of the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 are all grounded. The first conduction terminal 1211 of the seventh transistor Q7 is connected to the second conduction terminal 1213 of the first transistor Q1, the second conduction terminal 1213 of the seventh transistor Q7 is grounded. 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 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, and the second conduction terminal 1213 of the ninth transistor Q9 is grounded.The nodes between the first conduction terminal 1211 of the seventh transistor Q7 and the second conduction terminal 1213 of the first transistor Q1, the node between the first conduction terminal 1211 of the eighth transistor Q8 and the second conduction terminal 1213 of the second transistor Q2, and the node between the first conduction terminal 1211 of the ninth transistor Q9 and the second conduction terminal 1213 of the third transistor Q3 each function as the three drive signal output terminals 122. At least three of the signal input terminals 121 are three PWM signal input terminals, and the control signal includes three PWM signals.

[0087] As shown in FIG. 4-2, the fan drive circuit also includes a current detection circuit 15. The second conduction terminals 1213 of the seventh transistor Q7, the eighth transistor Q8, and the ninth transistor Q9 are all grounded through 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 sense resistor 151 and a sense capacitor 152. The second conduction terminals 1213 of the seventh transistor Q7, the eighth transistor Q8, and the ninth transistor Q9 are grounded through the sense resistor 151 and the sense capacitor 152 in sequence, and the node between the sense resistor 151 and the sense capacitor 152 is electrically connected to the main control circuit 11. When the abnormal current occurs in the current detection circuit 15, the main control circuit 11 controls to stop the operation of the fan drive circuit 10 or operate at a lower power, provides overcurrent protection for the fan drive circuit 10, and can improve the reliability and service life of the fan drive circuit.

[0088] Referring to FIGS. 4-4 and 4-6, the fan drive circuit includes an interface circuit 16 and a charging management circuit 17. The interface circuit 16 is used to electrically connect to an external power source and 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 to charge the battery VBAT or output a supply voltage. The fan drive circuit 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. 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 be electrically connected to the main control circuit 11. The negative electrode of the light-emitting diode is grounded.

[0089] Specifically, in this embodiment, the fan drive circuit can be applied to a neck-mounted fan, but is not limited to a neck-mounted fan, and can also be applied to portable fans such as a desktop fan, a stand fan, a hand-held fan, a clip fan, a folding fan, etc. The two DC brushless fan motors are respectively arranged on the left and right sides of the neck-mounted fan and are used to rotationally drive the fan blades on the left and right sides of the neck-mounted fan.

[0090] As shown in FIGS. 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. There are two of each of the three-phase drive circuit 12, the back electromotive force detection circuit 14, and the DC brushless fan motor, and they are installed in a one-to-one correspondence. The main control chip 111 is electrically connected to one of the three-phase drive circuits 12, and thereby outputs a control signal to one of the three-phase drive circuits 12 to drive a corresponding one of the DC brushless fan motors. The back electromotive force detection circuit 14 is electrically connected to the corresponding three-phase drive circuit 12 and outputs the corresponding first detection signal, second detection signal, and third detection signal to the main control chip 111, so that the main control chip 111 obtains the phase of the three-phase drive signal of one of the three-phase drive circuits 12 and adjusts the control signal output to one of the three-phase drive circuits 12. The auxiliary chip 113 is electrically connected to the other three-phase drive circuit 12, and thereby outputs a control signal to the other three-phase drive circuit 12 to drive a corresponding other DC brushless fan motor. The other back electromotive force detection circuit 14 is electrically connected to the corresponding three-phase drive circuit 12 and outputs the corresponding first detection signal, second detection signal, and third detection signal to the auxiliary chip 113, so that the auxiliary chip 113 obtains the phase of the three-phase drive signal of the other three-phase drive circuit 12 and adjusts the control signal output to the other three-phase drive circuit 12.

[0091] In this embodiment, the main control chip 111, the corresponding three-phase drive circuit 12, and the corresponding back electromotive force detection circuit 14 are arranged on one module (for example, the first circuit board), and can be arranged on the same side of the neck-mounted fan as the corresponding DC brushless fan motor. The auxiliary chip 113, the corresponding three-phase drive circuit 12, and the corresponding back electromotive force detection circuit 14 are arranged on another module (for example, another second circuit board independent from the first circuit board), and can be arranged on the other side of the neck-mounted fan from the corresponding DC brushless fan motor. It can be seen that the above design improves rationality and compactness, and can also improve the reliability of connection and drive. However, the layouts of the three-phase drive circuit 12, the back electromotive force detection circuit 14, the main control chip 111, and the auxiliary chip 113 are various. For example, the three-phase drive circuit 12, the back electromotive force detection circuit 14, the main control chip 111, and the auxiliary chip 113 described above are all arranged on the same circuit board, or the three-phase drive circuit 12 and the back 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, which can be specifically selected according to actual needs and will not be described again here.

[0092] Referring to FIGS. 4-7 and 4-8, the fan drive circuit includes the first connector 261 and a speed adjustment interface circuit 26 having the second connector 262. The first pin and the second pin of the first connector 261 are electrically connected to the main control chip 111 respectively, and the third pin of the first connector 261 is grounded. The first pin of the second connector 262 is connected to the battery VBAT through a first connection resistor on one hand and connected to the auxiliary chip 113 through a second connection resistor on the other hand. The second pin of the second connector 262 is connected to the auxiliary chip 113 through a third connection resistor, and the third pin of the second connector 262 is grounded. Also, each pin of the first connector 261 and the second connector 262 can be electrically connected one by one, whereby the rotational speeds of the two DC brushless fan motors can be adjusted synchronously.

[0093] Referring to FIGS. 4-9 to 4-14, the second embodiment of the present application provides a fan drive circuit. Descriptions of the same parts of the fan drive circuit and the fan drive circuit of the first embodiment are omitted. Hereinafter, the description will focus 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 is different from the main control circuit 11 of the first embodiment, and the main control circuit 11 of the second embodiment may mainly include a main control chip 111.

[0094] As shown in FIG. 4-10, in the second embodiment, the three-phase drive circuit 12 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6. The first conduction terminals 1211 of the first transistor Q1, the second transistor Q2, and the third transistor Q3 are connected to the power supply terminal 1212. The first conduction terminal 1211 of the fourth transistor Q4 is connected to the second conduction terminal 1213 of the first transistor Q1. The first conduction terminal 1211 of the fifth transistor Q5 is connected to the second conduction terminal 1213 of the second transistor Q2. The first conduction terminal 1211 of the sixth transistor Q6 is connected to the second conduction terminal 1213 of the third transistor Q3. The nodes between the first conduction terminal 1211 of the fourth transistor Q4 and the second conduction terminal 1213 of the first transistor Q1, between the first conduction terminal 1211 of the fifth transistor Q5 and the second conduction terminal 1213 of the second transistor Q2, and between the first conduction terminal 1211 of the sixth transistor Q6 and the second conduction terminal 1213 of the third transistor Q3 are respectively used as the three drive signal output terminals 122. The control terminals of the first transistor Q1, the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 are respectively electrically connected to the main control circuit 11 for receiving the control signal, and the control signal includes six PWM signals.

[0095] As shown in FIG. 4-10, the following is basically the same as the first embodiment. The second conduction terminal 1213 of the sixth transistor Q6 is grounded through 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 sense resistor 151 and a sense capacitor 152. The second conduction end 1213 of the sixth transistor Q6 is grounded through the sense resistor 151. The sense capacitor 152 is connected in parallel with the sense resistor 151, and the node between the sense 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 sense resistor 151. The first series resistor 153 is connected between one end of the sense capacitor 152 and one end of the sense resistor 151, and the second series resistor 154 is connected between the other end of the sense capacitor 152 and the other end of the sense resistor 151. When an abnormal current occurs through the current detection circuit 15, the main control circuit 11 controls to stop the operation of the fan drive circuit or operate at a lower power, provides overcurrent protection for the fan drive circuit, and improves the reliability and service life of the fan drive circuit.

[0096] As shown in FIG. 4-11, since the back electromotive force detection circuit 14 of the second embodiment is basically the same as the back electromotive force detection circuit 14 of the first embodiment, the description here is omitted.

[0097] As shown in FIG. 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, whereby 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 the ground. The transistor temperature detection circuit 24 includes a voltage stabilizing capacitor 243 connected in parallel with the thermistor 242. The main control circuit 11 can know whether the temperature of each transistor of the three-phase drive circuit 12 is abnormal through the transistor temperature detection circuit 24. When an abnormality occurs, the main control circuit 11 controls the fan drive circuit to stop operating or operate at a lower power, provides overcurrent protection for the fan drive circuit, and improves the reliability and service life of the fan drive circuit.

[0098] As shown in FIG. 4-13, the fan drive circuit includes a battery voltage detection circuit 25 electrically connected between the positive electrode of the battery VBAT and the ground. The output terminal 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 know whether the battery voltage is normal. When the battery voltage is abnormal, the main control circuit 11 controls the fan drive circuit to stop operating or operate at a lower power, provides overcurrent protection for the fan drive circuit, and improves the reliability and service life of the fan drive circuit.

[0099] 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 seen that the above-described battery voltage detection circuit 25 has a simple structure, high reliability, and low cost.

[0100] As shown in FIGS. 4-14, the fan drive circuit of the second embodiment of the present application also has a burn-in interface 28, which is used to burn a control program into the main control circuit 11. The burn-in interface 28 may be an SWD burn-in interface, but is not limited thereto.

[0101] Referring to FIGS. 4-15 to 4-16, the third embodiment of the present application provides a fan drive circuit. The same parts of the fan drive circuit of the third embodiment as those of the fan drive circuit of the second embodiment will not be described again. Hereinafter, the differences between the fan drive circuit of the third embodiment and the fan drive circuit of the second embodiment will be described.

[0102] As shown in FIGS. 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. Different from the main control circuit 11 of the second embodiment, the main control circuit 11 of the third embodiment includes a main control chip 111 and three three-phase control chips 112. Each of the three-phase control chips 112 is electrically connected to the main control chip 111 and the three-phase drive circuit 12.

[0103] As shown in FIGS. 4-16 and 4-18, the fan drive circuit also 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. The node between the filter capacitor 253 and the sampling resistor 254 is electrically connected to the main control circuit 11. Further, the fan drive circuit also includes a signal amplification circuit 29. The input terminal of the signal amplification circuit 29 is connected to the node between the filter capacitor 253 and the sampling resistor 254. The signal amplification circuit 29 amplifies 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 is used to provide the amplified signal to the main control circuit 11. Thereby, when an abnormality occurs in the entire fan drive circuit, the main control circuit 11 of the fan drive circuit can sensitively detect abnormal signals of voltage and current. Further, the main control circuit 11 can perform abnormal protection operations such as operation stop and reduction of the fan rotation speed, and can improve the use safety of the fan drive circuit.

[0104] As shown in FIG. 4-19, since the transistor temperature detection circuit 24 of the third embodiment is basically the same as that of the second embodiment, the description here is omitted.

[0105] Referring to FIG. 4-20, FIG. 4-20 is a schematic configuration diagram of a lighting control circuit 30 of a fan drive circuit provided in the third embodiment of the present application. The lighting 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 drive voltage, and the negative electrode of the light emitting element 301 is grounded through two conduction terminals of a resistor and the control switch 302. The control terminal of the control switch 302 is electrically connected to the main control circuit 11, whereby the main control circuit 11 outputs a lighting control signal to the control terminal of the control switch 302 to control the lighting of the light emitting element 301.

[0106] As shown in FIG. 4-21, the fan drive circuit also includes the Hall detection circuit 23. The Hall detection circuit 23 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. Thereby, 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 provide a corresponding control signal to control the operation of the three-phase drive circuit 12. In this case, the fan using the fan drive circuit has a short startup time, no jitter during startup, and can realize a higher user experience.

[0107] As shown in FIG. 4-21, the Hall detection circuit 23 also includes a motor temperature detection element 232 connected between the Hall element 231 of the Hall detection circuit 23 and the main control circuit 11. The motor temperature detection element 232 may be a sampling resistor. The main control circuit 11 knows whether the temperature of the DC brushless fan motor is abnormal through the motor temperature detection element 232, and when an abnormality occurs, stops the operation of the fan drive circuit or controls it to operate at a lower power, provides overcurrent protection for the fan drive circuit, and improves the reliability and service life of the fan drive circuit.

[0108] As shown in FIGS. 4-17 and 4-22, the fan drive circuit also includes a voltage conversion circuit 20. The voltage conversion circuit 20 receives the battery voltage (VB+) and converts the battery voltage into a drive voltage (such as 15V) and is used to supply the drive voltage to the power terminals 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. Thereby, the three three-phase control chips 112 each output a control signal to the three-phase drive circuit 12.

[0109] The fan drive circuit also includes a switch control circuit 21. The switch control circuit 21 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 tube 212, a second switch tube 213, and a third switch tube 214. Two conductive terminals of the first switch tube 212 are respectively connected to the positive electrode of the battery VBAT and the input terminal of the voltage conversion circuit 20. The control terminal of the first switch tube 212 is grounded through two conductive terminals of the third switch tube 214, and the positive electrode of the battery VBAT is connected to the control terminal of the third switch tube 214 through two conductive terminals of the first switch tube 212 and a unidirectional diode 215. The control terminal of the second switch tube 213 is grounded through the button 211. The control terminal of the third switch tube 214 is electrically connected to the main control circuit 11. A node between the second switch tube 213 and the unidirectional diode 215 is electrically connected to the switch signal terminal of the main control circuit 11.

[0110] 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 a node between the second switch tube 213 and the unidirectional diode 215 outputs a first switch signal (ON) to the switch signal terminal of the main control circuit 11. The first switch tube 212 is turned on, whereby the battery voltage of the battery VBAT is supplied to the voltage conversion circuit 20. When the pressing of the button 211 is released, the second switch 213 is turned off, and the main control circuit 11 outputs a power-off signal to the control terminal of the third switch tube 214 according to the first switch signal to maintain the conduction of the third switch tube 214, and the battery voltage of the battery VBAT is supplied to the voltage conversion circuit 20.

[0111] Furthermore, when the battery voltage of the battery VBAT is supplied to the voltage conversion circuit 20, if the button 211 is pressed again and turned on, the node between the second switch tube 213 and the unidirectional diode 215 outputs a second switch signal (OFF) to the switch signal terminal of the main control circuit 11. The main control circuit 11 outputs a power supply cut-off signal corresponding to the second switch signal to the control terminal of the third switch tube 214, controls the third switch tube 214 to turn off, and then the first switch tube 212 turns off. Until the button 211 is pressed again and turned on, the battery voltage of the battery VBAT cannot be supplied to the voltage conversion circuit 20.

[0112] By the cooperation of the button 211, the first switch 212, the second switch 213 and the third switch 214 with the main control circuit 11, it is possible to control whether to supply the battery voltage of the battery VBAT to the voltage conversion circuit 20, which has the advantages of not only simple control logic but also high reliability.

[0113] As shown in FIG. 4-23, the fan drive circuit also includes a DC conversion circuit 22. The DC conversion circuit 22 receives the drive voltage (such as a 15V DC voltage) and is used to convert it into other DC operating voltages such as 3.3V and 5V DC operating voltages.

[0114] Referring to FIG. 24, an embodiment of the present application provides a portable fan 2. The portable fan 2 includes a fan drive circuit 3, a DC brushless fan motor 4, and a fan blade 5 driven by the DC brushless fan motor. The fan drive circuit 3 employs the fan drive circuit described in each of the above embodiments.

[0115] Compared with the prior art, in the fan drive circuit and the portable fan 2 of the above embodiment, by using the main control circuit 11, the three-phase drive circuit 12, the back electromotive force detection circuit 14, and the DC brushless fan motor, the energy-saving performance and control performance of the fan motor are improved, not only the reliability of the fan drive circuit and the portable fan 2 is improved, but also the service life of the fan drive circuit and the portable fan 2 is extended. Moreover, by using the DC brushless fan motor, the structure of the portable fan 2 can be simplified and miniaturized, and the market competitiveness of the product can be improved.

[0116] Embodiment 5 is shown in FIGS. 5-1 to 5-3.

[0117] As shown in FIGS. 5-1 to 5-3, the charging management circuit of the portable fan includes at least one of a fast charging management unit 300 and a charging management unit 400. The fast charging management unit 300 includes a fast charging communication module, a fast charging control signal output module, a fast charging voltage setting module, and a fast charging current setting module. The charging management unit 400 includes a charging communication module, a charging drive module, a charging current detection module, an end voltage setting module, a charging state output module, and an overheat protection module. The charging management circuit of the portable fan equipped with the fast charging management unit and the charging management unit can switch between the fast charging mode and the normal boost charging mode.

[0118] The portable fan includes a hand-held fan, a neck-mounted fan, a desktop fan, a waist-mounted fan, a neck-hung fan, a head-mounted fan, etc.

[0119] 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, and the USB output unit 220 is connected to a fast charging management unit 300 and a 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 control terminal of the switch circuit, and the charging management unit 400 is connected to the battery pack 600. The fast charging management unit 300 and the control unit 500 are connected to the battery pack 600 via the charging management unit 400, and the charging display unit 700 is connected to the control unit 500.

[0120] The portable fan is connected to the fast charging management unit 300, the charging management unit 400, and the control unit 500 via the charging adapter 100, the USB input unit 210, and the USB output unit 220, and supplies power to the battery pack 600. The fast charging management unit 300 and the charging management unit 400 communicate with the charging adapter 100 via a USB interface.

[0121] The USB output unit 220 includes a USB interface J1, the fast charging management unit 300 includes a power protocol chip (USB PD Sink) U2, and the charging management unit 400 includes a charging chip U1.

[0122] The pins A1B12 and A12B1 of the USB interface J1 are grounded, and the fast charging management unit 300 and the charging management unit 400 are connected to the VBUS pins A4B9 and A9B4 of the USB interface J1 to introduce external power. The DP data pin A6B6 and the DM data pin A7B7 of the USB interface J1 are connected to the fast charging management unit 300 and the charging management unit 400 and are used for the fast charging management unit 300 and the charging management unit 400 to identify an external power source. The data positive signal (data plus, DP) and the data negative signal (data minus, DM) are USB data signal lines.

[0123] In one embodiment, the power protocol chip U2 is communicably connected to the USB interface J1 via the data signal lines and configuration channels of the fast charging communication module. The fast charging communication module includes the following. The DP' data pin 2 of the power protocol chip U2 is connected to the DP' data pin A6B6 of the USB interface J1 via the current limiting resistor R1, and the DM' data pin 3 of the power protocol chip U2 is connected to the DM data pin A7B7 of the USB interface J1 via the current limiting resistor R2. The first pin 4 of the CC1 configuration channel and the second pin 5 of the CC2 configuration channel of the power protocol chip U2 are respectively connected to the first pin A5 of the CC1 configuration channel and the second pin B5 of the CC2 configuration channel of the USB interface J1. The first pin 4 and the second pin 5 of the CC1 configuration channel (Connection Configuration) of the power protocol chip U2 are respectively grounded via the capacitor C1 and the capacitor C2. The capacitor C1 and the capacitor C2 are used to filter the current and stabilize the voltage. The fast charging communication module of the power 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), and is used to apply for, identify, and monitor the voltage required for charging the battery pack 600 of the portable fan.

[0124] In one embodiment, the fast charging control signal output module includes the following. The power protocol chip U2 establishes fast charging communication with the charging adapter 100 via the configuration channel pins (pins 4 and 5), and outputs a fast charging drive signal via the fast charging drive pin 10.

[0125] In one embodiment, the VIN chip power pin 1 of the power protocol chip U2 is connected to VBUS via the current limiting resistor R3, and the VIN chip power pin 1 of the power protocol chip U2 is grounded via the voltage stabilizing capacitor C3.

[0126] The fast charging voltage setting module includes the following. The VSET voltage setting pin 8 of the power protocol chip U2 is grounded via the resistor R4. The power protocol chip U2 acquires the voltage signal of the resistor R4, thereby setting the charging voltage of the battery pack 600 to the fast charging mode. By changing the resistance value of R4, the fast charging voltage of the battery pack 600 can be changed.

[0127] The fast charging current setting module includes the following. The ISET current setting pin 9 of the power protocol chip U2 is grounded via the resistor R5. The power protocol chip U2 acquires the voltage signal of the resistor R5, thereby setting the charging current of the battery pack 600 to the fast charging mode. By changing the resistance value of R5, the fast charging current of the battery pack 600 can be changed.

[0128] The operating principle of the fast charging mode is as follows. The power protocol chip U2 establishes PD fast charging communication with the charging adapter 100 via the first pin 4 of the CC1 configuration channel and the second pin 5 of the CC2 configuration channel, sets the fast charging voltage via the monitored VSET voltage setting pin 8, sets the fast charging current via the monitored ISET current setting pin 9 signal, outputs a fast charging drive signal via the GATE pin 10, the charging head outputs a high voltage to fast charge the battery pack 600, and is connected to the I2C (serial bus) bus via the Serial Data line (SDA) pin 6 and the Serial Clock line (SCL) pin 7, and communicates with the control unit 500 of the portable fan to transmit the fast charging state.

[0129] The VBUS charging input pin 1 of the charging chip U1 is connected to VBUS. One end of the voltage stabilization capacitor C4 is connected to the VBUS charging input pin 1 of the charging chip U1, and the other end is grounded and used to filter the current and stabilize the power supply.

[0130] In one embodiment, the charging communication module includes the following. The DPC data positive signal pin 5 of the charging chip U1 is connected to the USB data positive signal via the current limiting resistor R6, and the DMC data negative signal pin 6 is connected to the USB data positive signal via the current limiting resistor R7. The charging communication module is used for the charging chip U1 to identify the state of the external power supply.

[0131] In one embodiment, the charging drive module includes the following. 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 both ends of the transformer energy storage inductor L1. The first bootstrap capacitor pin 11 of BT1 and the second bootstrap capacitor pin 14 of BT2 of the charging chip U1 are respectively connected to both ends of the transformer energy storage inductor L1 via capacitors C5 and C6. Capacitors C5 and C6 are bootstrap capacitors that provide a boost bias voltage to the boost circuit. Both ends of the voltage energy storage inductor L1 are grounded via current limiting resistors R8 and R9 respectively. Two RC circuits installed at the NC of the charging chip U1 are connected in parallel to R8 and R9 respectively and then grounded, and are used to filter high-frequency signals.

[0132] The VBAT charging output pin 3 of the charging chip U1 is connected to the battery pack 600. After the filter capacitors C7, C8, C9, C10 and C11 are connected in parallel, one end is connected to the pin 3 of the charging chip U1, and the other end is grounded. The positive electrode of the diode D2 is grounded, and the negative electrode is connected to the VBAT charging output pin 3 of the charging chip U1. The charging chip U1 charges the battery pack 600 in a boost charging mode via the charging drive module.

[0133] The operating principle of the normal charging mode is as follows. The charging adapter 100 is a normal charging adapter. The charging chip U1 communicates with the charging adapter 100 via the DPC data positive signal pins 5 and 6 and requests the charging voltage. The charging chip U1 controls the MOS transistor circuit integrated inside to charge and store energy in the inductor L1. Next, the charging chip U1 turns on the MOS transistor circuit to release the energy of the inductor L1. In this case, the inductor L1 and VBUS are superimposed in series to obtain a boosting effect, and the battery pack 600 is charged through the boosting circuit.

[0134] The charging chip U1 has boosting and bucking functions. When the input voltage is lower than the charging voltage, the charging chip U1 boosts 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 drops the voltage to the charging voltage to charge the battery pack 600.

[0135] In one embodiment, the charging current detection module includes the following. The CSP current sampling positive pin 20 and the CSN current sampling negative pin 21 of the charging chip U1 are connected via a sampling resistor R10 to sense the charging current. After the capacitors C12, C13, C14, and C15 are connected in parallel, one end is connected to the CSP current sampling positive pin 20 of the charging chip U1, and the other end is grounded and used to filter the current and stabilize the voltage. The CSO inductive current monitoring pin 19 of the charging chip U1 is grounded via a resistor R11, and the voltage of the CSO inductive current monitoring pin 19 of the charging chip U1 is proportional to the inductive charging current. The charging chip U1 detects the charging current value of the battery pack 600 via the charging current detection module.

[0136] In one embodiment, the termination voltage setting module includes the following. The CSE battery termination voltage setting pin 7 of the charging chip U1 is grounded via a resistor R12, and the resistance value of the resistor R12 is used to set the battery termination voltage in the charging mode.

[0137] In one embodiment, the overheat protection module includes the following. The NTC thermistor pin 18 of the charging chip U1 is grounded via the resistor R14.

[0138] The charging status output module includes the following. 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 a charging status signal through the PG charging status pin 8.

[0139] The loop compensation module includes the following. The COMP loop compensation pin 17 of the charging chip U1 is grounded to an RC circuit formed by connecting the resistor R15 and the capacitor C17, and is used to enhance the stability and transient response of the circuit.

[0140] The VCC chip operating voltage output pin 9 of the charging chip U1 outputs an operating voltage and is grounded through the voltage stabilization capacitor C16.

[0141] Example 6 is shown in FIGS. 6-1 to 6-5.

[0142] As shown in FIG. 6-1 of the specification, the battery boost charging circuit of the portable fan includes a USB interface, a boost module, a boost charging management module, a charging voltage preset module, a charging status display module, and an overheat protection module.

[0143] The portable fan includes a hand-held fan, a neck-mounted fan, a waist-mounted fan, a neck-hanging fan, a head-mounted fan, a desktop fan, a car fan, etc.

[0144] The USB interface includes the interface J1, and the boost charging management module includes the charging chip U1.

[0145] As shown in FIG. 6-2 of the specification, in one embodiment, the boost charging management module has the following characteristics. A power MOS transistor and a Boost synchronous boost circuit are integrated in the charging chip U1.

[0146] The boost module circuit includes the following. One end of inductor L1 is connected to USB voltage VBUS, and the other end is connected to the LX external inductor pin 8 of charging chip U1. The BST bootstrap capacitor pin 7 of charging chip U1 is connected to pin 8 via bootstrap capacitor C2. Bootstrap capacitor C2 increases the DC bias voltage of the amplifier circuit and raises the amplitude of the output signal. The LX external inductor pin 8 of charging chip U1 is grounded via resistor R1 and capacitor C1. Resistor R1 and capacitor C1 are connected in series to form an RC circuit, which is used to filter high-frequency signals. One end of current-limiting resistor R2 is connected to USB voltage VBUS, and the other end is connected to the VIN power input pin 6 of charging chip U1, thereby introducing the input voltage. The VIN power input pin 6 of charging chip U1 is grounded via capacitor C4 to filter the current. One end of capacitor C5 is connected to USB voltage VBUS, and the other end is grounded. The boost charging circuit boosts and charges the BAT battery through the boost module.

[0147] A voltage stabilization filter circuit is installed in the battery boost charging circuit of the portable fan. The boost output VOUT boost output pin 2 of charging chip U1 outputs the charging voltage to charge the BAT battery. After filter capacitors C3 and C6 are connected in parallel, they are connected to the VBAT voltage, and the other end is grounded. A diode D1 is installed in the boost module NC (normally closed). The positive electrode of diode D1 is grounded, and its negative electrode is connected to VBAT.

[0148] After capacitors C7, C8, and C9 are connected in parallel, one end is connected to the VSYS boost output intermediate node pin 1 of charging chip U1, and the other end is grounded. The voltage stabilization filter circuit filters the current at the charging output terminal and stabilizes the voltage.

[0149] Pin 0 of charging chip U1 is grounded.

[0150] The operating principle of the boost module is as follows. After the MOS transistor connected to the inductor L1 of 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 transistor connected to the inductor L1 is turned off, the inductor L1 releases the stored energy. In this case, the inductor L1 and the USB voltage VBUS are superimposed in series to achieve a boost effect, and the BAT battery is charged through the Boost synchronous boost circuit. The MOS transistor of the charging chip U1 is controlled by its internal logic. When the charging chip U1 does not operate, the MOS transistor turns off the output of the chip to prevent the risk of leakage.

[0151] As shown in FIG. 6-3 of the specification, in one embodiment, the charging voltage preset module has the following characteristics. A resistor R3 is installed, one end is connected to the VSET voltage setting pin 4 of the charging chip U1, and the other end is grounded. The charging chip U1 detects the electrical signal of R4 and determines what charging voltage to output. The battery boost charging circuit sets the charging voltage through the charging voltage preset module.

[0152] In one embodiment, the overheat protection module has the following characteristics. One end of the thermistor R4 is connected to the NTC thermistor pin 3 of the charging chip U1, and the other end is grounded. The charging chip U1 determines the battery temperature by detecting the voltage of the thermistor R4, thereby realizing the overheat protection function of the charging module. The battery boost charging circuit realizes the overheat protection function of the circuit through the overheat protection module.

[0153] In one embodiment, the charging status display module has the following characteristics. A resistor R5 is installed, one end is connected to the LED charging display pin 5 of the charging chip U1, and the other end is grounded. The LED charging display 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 display module.

[0154] As shown in FIG. 6-4 of the specification, in one embodiment, a charging communication module is provided in the battery boost charging circuit. The battery boost charging circuit includes the following. Pin 2 of interface J1 is connected to pin 5 to output the USB voltage VBUS of the boost charging circuit. The first pin 3 of the CC1 configuration channel and the second pin 4 of the CC2 configuration channel of interface J1 are respectively connected to pull-down resistors R6 and R7, and the other ends of resistors R6 and R7 are both grounded. By detecting the voltage values of CC1 and CC2, identification functions such as cable connection and removal, and socket / plug direction are realized. 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.

[0155] One end of capacitors C10 and C11 is connected to the USB voltage VBUS, and the other end is grounded, thereby filtering the current to stabilize the voltage and avoiding peak voltage. The USB voltage VBUS is grounded through a discharge resistor R8 to avoid unnecessary power consumption.

[0156] As shown in FIG. 6-5 of the specification, in one embodiment, the battery boost charging circuit is also provided with circuit switching interfaces BD, P1, and P2 for switching the circuit signals of the portable fan.

[0157] 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 and operation of the portable fan.

[0158] 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 interface P2 to control the start, stop, and gear adjustment of the portable fan.

[0159] In addition, interface P2 receives the VBAT battery voltage, USB voltage VBUS, and PG signal transmitted from the charging chip U1 and transmits them to the main control chip of the portable fan.

[0160] The above are only preferred embodiments of the present application, which do not limit the protection scope of the present application. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present application are similarly included in the patent protection scope of the present application.

Claims

1. A fan including a housing, wherein the housing includes a connection part and head side parts respectively connected to both sides of the connection part, the connection part and the two head side parts together surround to form a head hanging space, an electric exhaust part is installed on the connection part and / or at least one of the head side parts, and each electric exhaust part is used to blow air toward the head hanging space. The fan is characterized by this.

2. The electric exhaust part includes a positioning stud, a rotating blade, and a three-phase motor drive assembly drivingly connected to the rotating blade, the three-phase motor drive assembly includes a stator and a rotor sleeved outside the stator, the rotor is fixedly installed on the rotating blade and is arranged coaxially with the rotating blade, and the stator is fixedly sleeved on the positioning stud. The fan according to claim 1 is characterized by this.

3. The electric exhaust part is installed on the connection part. A first air guiding cavity is installed in the connection part. A first air outlet communicating with the first air guiding cavity is installed on the connection part. The first air outlet faces the head hanging space. The positioning stud is provided in the first air guiding cavity. The rotating blade is rotatably installed in the first air guiding cavity and is used to blow air out of the first air outlet, a first air inlet communicating with the first air guiding cavity is provided on the connection part. The first air inlet faces the end of the rotating blade. The first air outlet faces the side surface of the rotating blade, a plurality of first air guiding ribs are provided on the connection part. The plurality of first air guiding ribs surround to form the first air guiding cavity. The number of the first air outlets is plural. The plurality of first air outlets are installed at intervals along the extending direction of the connection part. The end of the first air guiding cavity is communicated with the plurality of first air outlets. The fan according to claim 2 is characterized by this.

4. The rotating blade is provided with a fixing hole, the axis of the fixing hole is on the same straight line as the axis of the rotating blade, the electric exhaust part further includes a rotating shaft, the first end of the rotating shaft is inserted into and fixed in the fixing hole, a positioning hole is provided inside the positioning stud, the axis of the positioning hole is on the same straight line as the axis of the rotating shaft, and the second end of the rotating shaft is rotatably inserted into the positioning hole. The fan according to claim 2, characterized in that.

5. At least one of the electric exhaust parts includes a bearing part, the outer ring of the bearing part is fixed in the positioning hole, the inner ring of the bearing part is sleeved on the second end of the rotating shaft, the bearing part includes a rolling bearing, the electric exhaust part includes a limiting member, the limiting member is installed on the second end of the rotating shaft, the bearing part is located between the limiting member and the first end of the rotating shaft, the number of the bearing parts is plural, an inner flange is provided on the inner side wall of the positioning hole, and the inner flange is installed between two adjacent bearing parts so that two adjacent bearing parts are installed at intervals, or The bearing part includes a sliding bearing, the electric exhaust part includes two sealing rings, and the two sealing rings are sleeved on the rotating shaft and arranged on both sides of the sliding bearing respectively. The fan according to claim 4, characterized in that.

6. The electric exhaust parts are both installed on the two head side parts, a second air guiding cavity is provided in the head side part, a second air outlet communicated with the second air guiding cavity is provided on the head side part, the second air outlet faces the head hanging space, the positioning column is provided in the second air guiding cavity, the rotating blade is rotatably installed in the second air guiding cavity and is used to blow air out of the second air outlet, a second air inlet communicated with the second air guiding cavity is provided on the head side part, the second air inlet faces the end of the rotating blade, and the second air outlet faces the side surface of the rotating blade. The fan according to claim 2, characterized in that.

7. The fan includes a power supply part, the power supply part is installed in the housing, the power supply part is electrically connected to each electric exhaust part, a charging port is provided on the housing, and the charging port is electrically connected to the power supply part. The fan according to claim 1, characterized in that.

8. A control circuit for a head-mounted fan including a charging power supply circuit, a fan drive circuit, and a main control circuit, wherein the charging power supply circuit is used to electrically connect an external power supply and a battery, thereby receiving an external voltage, charging the battery, and outputting a power supply voltage, the fan drive circuit is electrically connected to the charging power supply circuit and the fan, and is used to rotationally drive the fan, and the main control circuit is connected to the charging power supply circuit and the fan drive circuit. A control circuit for a head-mounted fan is characterized by the above.

9. The charging power supply circuit includes a charging port and a charging management chip. The power supply terminal of the charging port receives the external voltage and is electrically connected to the charging input pin of the charging management chip. The power supply terminal of the charging port is electrically connected to the negative electrode of a voltage stabilizing tube, and the positive electrode of the voltage stabilizing tube is grounded. The switch pin of the charging management chip is used to electrically connect the positive electrode of the battery via a first inductor. The boost output pin of the charging management chip is used to output the power supply voltage. The boost input pin of the charging management chip is connected to the node between the battery and the first inductor via a first connection resistor on one hand and is grounded via a first ground 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 drive pin of the charging management chip is grounded sequentially via the first ground resistor and the second ground resistor. The second LED drive pin of the charging management chip is connected to the positive electrode of the battery via a second connection resistor. The first indicator light pin of the main control circuit is grounded via a first indicator light branch. The second LED drive pin of the charging management chip is grounded via a second indicator light branch. Both the first indicator light branch and the second indicator light branch include a current limiting resistor and an indicator light connected in series. The control circuit for a head-mounted fan according to claim 8 is characterized by the above.

10. The control circuit for a head-mounted fan includes a refrigeration control circuit. The refrigeration control circuit is electrically connected to a refrigeration element and the charging power supply circuit, and is used to cool and drive the refrigeration element. The refrigeration control circuit includes a first control switch. The first conduction terminal of the first control switch is used to receive the output voltage of the battery or the power supply voltage via the refrigeration element. The second conduction terminal of the first control switch is grounded. The main control circuit is electrically connected to the refrigeration control circuit, and the main control circuit is used to output a first pulse width control signal for controlling the on / off of the first control switch, and further controls the intermittent on and off of the refrigeration element. The control circuit of the hanging fan according to claim 8, characterized in that.

11. The control circuit further includes a second control switch. The first conduction terminal of the second control switch is electrically connected to the positive electrode of the battery so as to receive the output voltage of the battery. The control terminal of the second control switch is used to receive the external voltage and is grounded. The second conduction terminal of the second control switch is electrically connected to the fan drive circuit. The second control switch is turned off when the external voltage is received, and is turned on when the external voltage is not received. The control circuit of the hanging fan according to claim 8, characterized in that.

12. The control terminal of the second control switch is grounded via a third grounding resistor and is connected to the second conductive terminal of the second control switch and the fan drive circuit via a first diode. The second control switch is a PMOS field effect transistor. The control terminal of the first control switch is electrically connected to the first pulse width signal output terminal of the main control circuit via a third connection resistor. The node between the control terminal of the first control switch and the third connection resistor is grounded via a fourth connection resistor. The first control switch is an NMOS field effect transistor. The refrigeration element receives the output voltage of the battery or the power supply voltage via a fifth connection resistor. The control circuit of the hanging fan according to claim 11, characterized in that.

13. The control circuit includes an encoder, the encoder is connected to the positive electrode of the battery and grounded, two output terminals of the encoder are respectively connected to the main control circuit, the encoder has a stepless control knob for user operation, and by operating the stepless control knob by the user, the two output terminals of the encoder output a plurality of different digital signals, and the main control circuit controls the first control switch to control the cooling intensity of the refrigeration element according to the digital signal, or is used to control the drive circuit of the fan to control the rotation speed of the fan according to the digital signal. The control circuit of the hanging fan according to claim 8, characterized in that.

14. 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 the charging power supply circuit to receive the external voltage or the power supply voltage. The other end of the second inductor is connected to the fan through the second diode. The first conduction terminal of the third control switch is connected to the node between the second inductor and the second diode. The second conduction terminal of the third control switch is grounded. The control terminal 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 dividing resistor and a second voltage dividing resistor connected in series. The node between the first voltage dividing resistor and the second voltage dividing resistor is connected to the main control circuit through a third voltage dividing resistor. The node between the third voltage dividing resistor and the main control circuit is grounded through a second grounding capacitor. The control circuit of the hanging fan according to claim 8, characterized in that.

15. The fan driving circuit includes a fourth control switch, a third diode, a first feedback resistor, and a second feedback resistor. The negative electrode of the third diode is connected to the positive electrode of the fan. The negative electrode of the fan is connected to the positive electrode of the third diode and the first conduction terminal of the fourth control switch. The control terminal of the fourth control switch is electrically connected to the fan enable terminal of the main control circuit. The second conduction terminal of the fourth control switch is grounded via the first feedback resistor. The node between the second conduction terminal of the fourth control switch and the first feedback resistor is electrically connected to the load feedback terminal of the main control circuit via the second feedback resistor. The node between the second feedback resistor and the main control circuit is grounded via a third grounding capacitor. The control circuit of the hanging fan according to claim 8, characterized in that

16. A motor drive control circuit for a portable fan, including a battery power supply, a voltage stabilization unit, a main control unit, a motor, a USB access circuit, an analog-to-digital converter power supply circuit, and a display unit, The motor drive control circuit of the portable fan further includes a motor drive control unit, a motor drive circuit, and a rotor position detection circuit. The motor drive control circuit of the portable fan is characterized in that

17. The permanent magnet is arranged on the rotor of the motor. The first winding, the second winding, and the third winding are arranged in a Y-shaped connection on the stator of the motor. The MOS transistor switch circuit of the motor drive control circuit of the portable fan is connected to the first winding, the second winding, and the third winding of the motor. The motor drive control unit controls the magnitude, direction, or phase relationship of the current flowing through each phase winding. The motor drive circuit includes a first MOS transistor switch. One end of the first MOS transistor switch is connected to the power supply voltage, and the other end is connected to the first winding. The conduction of the first MOS transistor switch is controlled by a second MOS transistor switch. One end of the second MOS transistor switch is connected to the power supply voltage via a first resistor, and the other end is grounded. The second MOS transistor switch receives a pulse modulation control signal from the motor drive control unit. The motor drive control circuit of the portable fan according to claim 16, characterized in that

18. The motor drive circuit includes a third MOS transistor switch. One end of the third MOS transistor switch is connected to the first winding, and the other end is grounded via a current sampling resistor. The third MOS transistor switch receives a pulse modulation control signal from the motor drive control unit. The motor drive control circuit of the portable fan according to claim 17, characterized in that.

19. A reverse diode is provided in the MOS transistor switch. The first MOS transistor switch is a P-type MOS transistor, and the second MOS transistor switch and the third MOS transistor switch 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. The motor drive control circuit of the portable fan according to claim 18, characterized in that.

20. The motor drive circuit includes a MOS transistor switch circuit composed of a fourth MOS transistor switch, a fifth MOS transistor switch, a sixth MOS transistor switch, a fourth resistor, a fifth resistor, and a sixth resistor for controlling the inflow and outflow of the current of the second winding. The motor drive circuit includes a MOS transistor switch circuit composed of a seventh MOS transistor switch, an eighth MOS transistor switch, a ninth MOS transistor switch, a seventh resistor, an eighth resistor, and a ninth resistor for controlling the inflow and outflow of the current of the third winding. The motor drive control unit includes a motor drive chip. The motor drive chip outputs a motor drive signal to the gate of the MOS transistor of the motor drive circuit. The control chip of the main control unit is connected to the USB access circuit, the analog-to-digital converter power supply circuit, and the display unit. The motor drive control circuit of the portable fan according to claim 19, characterized in that.

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