Ultrathin wireless charger with high heat dissipation performance

Abstract

The embodiment of the utility model relates to the technical field of wireless charging, and discloses an ultrathin wireless charger with high heat dissipation performance, and the wireless charger comprises a housing which is provided with a ventilation opening; the supporting plate is arranged in the shell, the supporting plate is a sheet with a certain area, a charging coil is attached to one face of the supporting plate, and a PCB and fan blades are attached to the other face of the supporting plate; the fan blades are used for rotating under the control of the PCB and driving air in the shell to flow during rotation; air in the shell is driven by the fan blades to pass through the PCB and then flows out of the ventilation opening. By means of the mode, the thickness of the wireless charger is reduced, and meanwhile the heat dissipation effect of the wireless charger is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless charging, in particular to a high-heat-dissipation ultra-thin wireless charger. BACKGROUND

[0002] With the progress of science and technology and the improvement of people's living standards, people use electronic devices more and more widely, and the convenience of the charging mode of electronic devices is also concerned. In the prior art, a wireless charger is usually used to realize the convenience of electronic device charging.

[0003] In order to meet the heat dissipation requirements of the wireless charger in use, more and more wireless chargers are provided with heat dissipation fans, so that the thickness of the wireless charger is generally more than 12 mm. Among them, the thickness of the relatively thin wireless charger is maintained at 10 mm to 12 mm. Therefore, there is still room for improvement in the thickness of the existing wireless charger. Moreover, the fan blades of the existing wireless charger mainly blow external wind to the shell of the wireless charger to cool the charging coil in the wireless charger and the electronic device being charged. However, this heat dissipation method will cause heat accumulation inside the shell. Therefore, there is still room for improvement in the heat dissipation performance of the existing wireless charger.

[0004] In summary, how to improve the heat dissipation performance of the wireless charger while reducing the thickness of the wireless charger has become a technical problem to be solved. CONTENT OF THE INVENTION

[0005] In view of the above problems, the present application provides a high-heat-dissipation ultra-thin wireless charger for improving the heat dissipation effect of the wireless charger while reducing the thickness of the wireless charger.

[0006] According to an aspect of the present application, a high-heat-dissipation ultra-thin wireless charger is provided, which comprises: a shell provided with a ventilation opening; a support plate arranged inside the shell, the support plate being a thin sheet with a certain area, one side of the support plate being attached with a charging coil, and the other side being attached with a PCB and a fan blade; the fan blade is used to rotate under the control of the PCB and drive the air flow in the shell when rotating; the air in the shell flows out from the ventilation opening after passing through the PCB under the driving of the fan blade.

[0007] Preferably, the ventilation opening comprises an air inlet and a plurality of air outlets; the PCB is in a ring structure, and the fan blade is arranged at the inner circle of the ring structure; the air inlet is aligned with the inner circle of the ring structure, and the plurality of air outlets are aligned with the PCB and distributed around the edge of the PCB; the edge of the fan blade is perpendicular to the rotation plane formed by the rotation of the fan blade; under the rotation of the fan blade, the air outside the shell flows into the inside of the shell through the air inlet, and the air inside the shell flows out to the outside of the shell from the plurality of air outlets after passing through the PCB.

[0008] Preferably, the wireless charger further comprises a motor fixed to the side of the support plate on which the PCB is attached; the motor comprises an output shaft, and the fan is fixed to the output shaft, the output shaft being perpendicular to the surface of the PCB, for driving the fan to rotate to form a rotating plane; the rotating plane formed by the rotation of the fan is in the same plane as the surface of the PCB.

[0009] Preferably, the other side of the support plate has a cylindrical mounting portion, the mounting portion is arranged at the inner ring of the annular structure, and the motor is sleeved in the mounting portion.

[0010] Preferably, the motor is embedded in the support plate, and the output shaft of the motor protrudes from the surface of the support plate and is connected to the fan.

[0011] Preferably, the PCB is used to generate a control signal and send the control signal to the motor to control the output of the motor; the side of the support plate on which the PCB is attached is recessed to form a first wiring area; the wireless charger further comprises a wire fixed to the first wiring area, one end of the wire being electrically connected to the PCB, and the other end of the wire being electrically connected to the motor, for transmitting the control signal from the PCB to the motor.

[0012] Preferably, the edge of the side of the support plate on which the PCB is attached is recessed to form a second wiring area; the shell comprises a bottom shell and a face shell, and the face shell covers the side of the support plate on which the charging coil is attached; the bottom shell covers the side of the support plate on which the PCB is attached, and the bottom shell is provided with a charging port, the charging port being aligned with the second wiring area, and the second wiring area being used to connect an external power supply to the PCB.

[0013] Preferably, the shell surface of the bottom shell has a certain area, the side wall of the bottom shell has a certain height, the air inlet is arranged on the shell surface of the bottom shell and has a certain area, and the plurality of air outlets are arranged on the side wall of the bottom shell.

[0014] Preferably, the wireless charger further comprises a magnet block arranged between the face shell and the support plate, and the face shell and the support plate form a clamping force on the magnet block.

[0015] Preferably, the support plate has a barrier strip protruding from one side, the charging coil is arranged on one side of the barrier strip and close to the center of the support plate, and the magnet block is arranged on the other side of the barrier strip opposite to the charging coil and close to the edge of the support plate; the barrier strip is connected at the head and tail to form a ring shape, and the coil outer side of the charging coil is connected to the barrier strip.

[0016] The embodiment of the present application pastes the charging coil on one side of the support plate, pastes the PCB and the fan blade on the other side, so that the support frame does not need to be separately arranged for the charging coil, the PCB and the fan blade inside the wireless charger, thereby saving multiple support frames to reduce the thickness of the wireless charger; and the air in the shell is driven by the fan blade to flow out from the air vent after passing through the PCB, so that the fan blade can directly cool the PCB; the charging coil is pasted on one side of the support plate, so that the heat generated by the charging coil during use can be efficiently transmitted to the support plate, and the PCB is pasted on the other side of the support plate, so that the heat of the support plate can be efficiently transmitted to the PCB, and then the fan blade directly cools the PCB, so that the heat generated by the charging coil and the heat generated by the PCB are taken out from the air vent to the outside of the shell of the wireless charger, thereby avoiding heat accumulation in the shell, and greatly improving the heat dissipation performance of the wireless charger.

[0017] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar components. In the drawings:

[0019] Figure 1 A perspective view of the wireless charger provided by the embodiment of the present application is shown;

[0020] Figure 2 A perspective view of the wireless charger provided by the embodiment of the present application is shown from another angle;

[0021] Figure 3 An internal structure diagram of the wireless charger provided by the embodiment of the present application is shown;

[0022] Figure 4 An exploded view of the wireless charger provided by the embodiment of the present application is shown.

[0023] The reference numerals in the specific embodiments are as follows:

[0024] 1. wireless charger;

[0025] 10. shell; 11. face shell; 12. bottom shell;

[0026] 13, vent; 131, air inlet; 132, air outlet; 133, charging port;

[0027] 21, magnet block; 22, charging coil; 23, barrier strip;

[0028] 30, support plate; 31, mounting portion; 32, first wiring area; 33, second wiring area;

[0029] 40, PCB board; 50, motor; 60, fan blade. DETAILED DESCRIPTION

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0033] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists, A and B exist, and B exists. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0035] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] The present application is applicable to wireless charging of electronic devices, for example, to Apple mobile phones.

[0039] The present application provides a high-heat-dissipation ultra-thin wireless charger, please refer to Figures 1-4 The wireless charger 1 comprises a shell 10, the shell 10 is provided with a ventilation opening 13; a support plate 30 is arranged inside the shell 10, the support plate 30 is a sheet with a certain area, one side of the support plate 30 is attached with a charging coil 22, and the other side is attached with a PCB (Printed Circuit Board) and a fan blade 60; the fan blade 60 is used to rotate under the control of the PCB 40 and drive the air flow in the shell 10 when rotating; the air in the shell 10 flows out from the ventilation opening 13 after passing through the PCB 40 under the driving of the fan blade 60.

[0040] Among them, the fan blade 60 is not provided with a protective shell and is exposed on the support plate 30; further, the fan blade 60 can be an integral part with the support plate 30, or can be two separable parts.

[0041] The ventilation and heat dissipation channel formed in the shell 10 specifically includes an air inlet 131 and a plurality of air outlets 132; the PCB 40 has a ring structure, and the fan blades 60 are arranged at the inner ring of the ring structure; the air inlet 131 is aligned with the inner ring of the ring structure, and the plurality of air outlets 132 are aligned with the PCB 40 and distributed around the edge of the PCB 40; under the rotation of the fan blades 60, the air outside the shell 10 flows into the interior of the shell 10 through the air inlet 131, and the air in the interior of the shell 10 flows out to the exterior of the shell 10 from the plurality of air outlets 132 after passing through the PCB 40.

[0042] Preferably, the edge of the one surface of the support plate 30 that is attached to the PCB 40 is recessed to form a second wiring area 33; the shell 10 includes a bottom shell 12 and a face shell 11, and the face shell 11 covers the one surface of the support plate 30 that is attached to the charging coil 22; the bottom shell 12 covers the one surface of the support plate 30 that is attached to the PCB 40, and the bottom shell 12 is provided with a charging port 133 that is aligned with the second wiring area 33, and the second wiring area 33 is used to connect an external power supply to the PCB 40.

[0043] Preferably, the shell surface of the bottom shell 12 has a certain area, the side wall of the bottom shell 12 has a certain height, the air inlet 131 is arranged on the shell surface of the bottom shell 12 and has a certain area, and the plurality of air outlets 132 are arranged on the side wall of the bottom shell 12.

[0044] Preferably, the wireless charger 1 further includes a magnet block 21, the magnet block 21 is arranged between the face shell 11 and the support plate 30, and the face shell 11 and the support plate 30 form a clamping force for the magnet block 21.

[0045] Preferably, the PCB 40 has a standard circular ring structure, and the inner circle part of the circular ring structure corresponds to the inner ring of the ring structure.

[0046] When charging the electronic device, first, the electronic device is attached to the face shell 11, and the PCB 40 senses the electronic device and controls the charging coil 22, the charging coil 22 generates an electromagnetic signal under the control of the PCB 40, and charges the electronic device by using the electromagnetic wave induction principle.

[0047] When the wireless charger 1 is used, the heat in the wireless charger 1, part of the heat is generated by the charging coil 22, and another part is generated by the PCB 40. In addition, the electronic device may also generate heat during wireless charging, and the heat is transmitted to the face shell 11.

[0048] For the heat in the wireless charger 1, since the fan blades 60 directly dissipate heat to the PCB 40, the heat in the wireless charger 1 is quickly transmitted to the PCB 40, and the fan blades 60 quickly dissipate heat to the PCB 40.

[0049] Specifically, please refer to Figure 2 and Figure 3 the edge of the fan blade 60 is perpendicular to the rotation plane formed by the rotation of the fan blade 60, the front surface of the rotation plane of the fan blade 60 can be made as the air inlet surface, and the side surface opposite to the rotation plane can be made as the air outlet surface; the PCB 40 has a ring structure, and the fan blade 60 is arranged at the inner ring of the ring structure, so that the heat generating components on the PCB 40 are located at the air outlet surface of the fan blade 60. That is, under the rotation of the fan blade 60, the low-temperature air outside the shell 10 enters the shell 10 through the air inlet 131, and thus the low-temperature air flowing into the shell 10 is blown over the PCB 40 under the driving of the fan blade 60, so that the heat of the components on the PCB 40 is transferred to the low-temperature air, the temperature of the low-temperature air is increased, and the low-temperature air carrying the heat of the PCB 40 flows out of the shell 10 through the air outlet 132, so as to realize the heat dissipation of the PCB 40 through the fan 60.

[0050] Please continue to refer to Figure 3 When the PCB 40 is rapidly cooled through the fan blade 60, a temperature difference is formed between the PCB 40 and the charging coil 22, the charging coil 22 is fixedly attached to the support plate 30, so that the heat of the charging coil 22 can be rapidly transferred to the support plate 30, the PCB 40 is fixedly attached to the support plate 30, so that the heat of the support plate 30 can be rapidly transferred to the PCB 40, and then the heat dissipation of the PCB 40 is realized through the fan blade 60, so that the heat dissipation of the multiple heat generating structures in the wireless charger 1 is realized through the fan 60.

[0051] Further, considering the heat transferred to the surface shell 11 of the electronic device, part of the heat can be directly transferred to the external low-temperature air, and part of the heat can also be transferred to the PCB 40 and dissipated through the fan blade 60.

[0052] Therefore, the wireless charger 1 has extremely high heat dissipation performance.

[0053] The specific heat dissipation performance of the wireless charger in the prior art can be referred to Table 1, and the specific heat dissipation performance of the wireless charger 1 provided in the embodiment of the present application can be referred to Table 2. The test environment of Table 1 and Table 2 is a normal temperature 25℃ environment, and the wireless charger in the prior art and the wireless charger 1 provided in the embodiment of the present application are respectively placed on a wooden table to charge a mobile phone (the mobile phone is not equipped with a mobile phone case and is placed in the center), the sample machine has a rated input of 15V, an output fixture of 25w, and an iPhone mobile phone; the data measured when the temperature curve is stable after aging.

[0054] It can be found from Table 1 that the actual temperature of the wireless charger in the prior art is generally above 55℃ when charging; and it can be found from Table 2 that the actual temperature of the wireless charger 1 provided in the present application is generally below 40℃ when charging.

[0055] Table 1

[0056]

[0057] Table 2

[0058]

[0059] In order to reduce the thickness of the wireless charger 1, the support plate 30 can be a thin sheet with a certain area, one side of the support plate 30 is attached with the charging coil 22, and the other side is attached with the PCB board and the fan blade 60. Further, the edge of the side of the support plate 30 attached with the PCB board 40 is recessed to form a second wiring area 33, so as to reduce the space thickness occupied by the wiring.

[0060] Preferably, the PCB board 40 is used to generate a control signal and send the control signal to the motor 50 to control the output of the motor 50; the side of the support plate 30 attached with the PCB board 40 is recessed to form a first wiring area 32; the wireless charger 1 further comprises a wiring fixed to the first wiring area 32, one end of the wiring is electrically connected to the PCB board 40, and the other end of the wiring is electrically connected to the motor 50, so as to transmit the control signal from the PCB board 40 to the motor 50.

[0061] Similarly, the side of the support plate 30 attached with the PCB board 40 is recessed to form a first wiring area 32, which can also reduce the space thickness occupied by the wiring.

[0062] Preferably, the side of the support plate 30 protrudes a barrier 23, the charging coil 22 is distributed on one side of the barrier 23 and close to the center of the support plate 30, and the magnet block 21 is distributed on the other side of the barrier 23 and close to the edge of the support plate 30; the barrier 23 is connected at the head and tail to form a ring shape, and the coil outside of the charging coil 22 is clamped to the barrier 23.

[0063] By attaching the magnet block 21 and the charging coil 22 on one side of the support plate 30 and attaching the PCB board and the fan blade 60 on the other side of the support plate 30, multiple support plate structures are combined into one support plate 30, thereby greatly reducing the thickness of the wireless charger 1.

[0064] Preferably, the wireless charger 1 further comprises a motor 50 fixed to the side of the support plate 30 attached with the PCB board 40; the motor 50 comprises an output shaft, the fan blade 60 is fixed to the output shaft, the output shaft is perpendicular to the plate surface of the PCB board 40, and the output shaft is used to drive the fan blade 60 to rotate to form a rotating plane; the rotating plane formed by the rotation of the fan blade 60 is located in the same plane as the plate surface of the PCB board 40.

[0065] By presenting the PCB board 40 as a ring structure, the fan blade 60 is arranged at the inner ring of the ring structure, so that the rotation plane formed by the rotation of the fan blade 60 is in the same plane as the board surface of the PCB, thereby reducing the space thickness required by the fan blade 40.

[0066] By recessing the first wiring area 32 on one side of the support plate 30 to which the PCB board 40 is attached, the space thickness required by the wiring can also be reduced.

[0067] As shown in Figure 3 The other side of the support plate 30 has a cylindrical mounting portion 31, which is arranged at the inner ring of the ring structure, and the motor 50 is sleeved in the mounting portion 31 to improve the stability of the motor 50; or the motor 50 is embedded in the support plate 30, and the output shaft of the motor 50 protrudes from the board surface of the support plate 30 and is connected with the fan blade 60, thereby reducing the space thickness required by the motor 50.

[0068] The embodiment of the present application sets the support plate 30 as a sheet with a certain area, one side of the support plate 30 is attached with the charging coil 22, and the other side is attached with the PCB board and the fan blade 60, so that multiple support structures are combined into one support plate 30, so that the thickness of the actual data display wireless charger 1 is in the range of 6.7mm~6.8mm, thereby greatly reducing the thickness of the wireless charger 1; by setting the air in the shell 10 to flow out from the air vent 13 after passing through the PCB board 40 under the drive of the fan blade 60, the fan blade 60 can directly cool the PCB board 40; one side of the support plate 30 is attached with the charging coil 22, so that the heat generated by the charging coil 22 during use can be efficiently transferred to the support plate 30, and the other side of the support plate 30 is attached with the PCB board 40, so that the heat of the support plate 30 can be efficiently transferred to the PCB board 40, and then the fan blade 60 directly cools the PCB board 40, so that the heat generated by the charging coil 22 and the heat generated by the PCB board 40 can be taken out from the air vent 13 to the outside of the shell 10 of the wireless charger 1, thereby avoiding heat accumulation inside the shell 10, and greatly improving the heat dissipation performance of the wireless charger 1.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high heat dissipation performance ultra-thin wireless charger, characterized in that, The application relates to a wireless charger. The wireless charger comprises a shell, a support plate, a fan blade and a PCB plate. The support plate is a thin sheet with a certain area, one side of the support plate is attached with a charging coil, and the other side is attached with the PCB plate and the fan blade. The fan blade is used for rotating under the control of the PCB plate and driving the air flow in the shell. The air in the shell flows out from the air outlet after passing through the PCB plate under the driving of the fan blade.

2. The wireless charger of claim 1, wherein, The air outlet comprises an air inlet and a plurality of air outlets. The PCB plate is in a ring structure, and the fan blade is arranged in the inner ring of the ring structure. The air inlet is aligned with the inner ring of the ring structure, and the plurality of air outlets are aligned with the PCB plate and distributed around the edge of the PCB plate. The edge of the fan blade is perpendicular to the rotation plane formed by the rotation of the fan blade. Under the rotation of the fan blade, the air outside the shell flows into the inside of the shell through the air inlet, and the air in the inside of the shell flows out to the outside of the shell from the plurality of air outlets after passing through the PCB plate.

3. The wireless charger of claim 2, wherein, The wireless charger further comprises a motor fixed to the side of the support plate attached with the PCB plate. The motor comprises an output shaft, the fan blade is fixed to the output shaft, the output shaft is perpendicular to the plate surface of the PCB plate and is used for driving the fan blade to rotate to form a rotation plane. The rotation plane formed by the rotation of the fan blade is in the same plane as the plate surface of the PCB plate.

4. The wireless charger of claim 3, wherein, The other side of the support plate has a cylindrical mounting portion arranged at the inner ring of the ring structure, and the motor is sleeved in the mounting portion.

5. The wireless charger of claim 3, wherein, The motor is embedded in the support plate, and the output shaft of the motor protrudes from the plate surface of the support plate and is connected with the fan blade.

6. The wireless charger of claim 3, wherein, The PCB plate is used for generating a control signal and sending the control signal to the motor to control the output of the motor. The side of the support plate attached with the PCB plate is recessed to form a first wiring area. The wireless charger further comprises a wire fixed to the first wiring area, one end of the wire is electrically connected with the PCB plate, and the other end of the wire is electrically connected with the motor, so as to transmit the control signal from the PCB plate to the motor.

7. The wireless charger of claim 3, wherein, The edge of the side of the support plate attached with the PCB plate is recessed to form a second wiring area. The shell comprises a bottom shell and a face shell, and the face shell covers the side of the support plate attached with the charging coil. The bottom shell covers the side of the support plate attached with the PCB plate, the bottom shell is provided with a charging port, the charging port is aligned with the second wiring area, and the second wiring area is used for connecting an external power supply to the PCB plate.

8. The wireless charger of claim 7, wherein, The shell surface of the bottom shell has a certain area, the side wall of the bottom shell has a certain height, the air inlet is arranged on the shell surface of the bottom shell and has a certain area, and the plurality of air outlets are arranged on the side wall of the bottom shell.

9. The wireless charger of claim 7, wherein, The wireless charger further comprises a magnet block arranged between the face shell and the support plate, and the face shell and the support plate form a clamping force for the magnet block.

10. The wireless charger of claim 9, wherein, One side of the support plate is provided with barrier strips, the charging coils are distributed on one side of the barrier strips and close to the center of the support plate, and the magnet blocks are distributed on the other side of the barrier strips and close to the edge of the support plate. The barrier strips are connected at the head and tail to form a ring shape, and the outer side of the charging coil is clamped to the barrier strips.

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