Wireless charging device and electronic pen

Abstract

The utility model discloses a wireless charging device and an electronic pen. The wireless charging device comprises a charging coil and a shielding layer. The charging coil is provided with a first surface and a second surface, the first surface is used for facing the external coil, the charging coil generates current or inductively generates current after the external coil is electrified, and the second surface and the first surface are arranged oppositely. The shielding layer faces the second surface and is located in the magnetic field range of the charging coil. The shielding layer can shield the magnetic field on one side and strengthen the magnetic field on the other side, and the shielding layer is arranged in the magnetic field range after the charging coil generates current or the magnetic field range after the charging coil is powered on and can strengthen the magnetic field intensity of the first surface facing the external coil. Therefore, the magnetic coupling strength between the charging coil and the external coil is increased, and the higher the magnetic coupling strength is, the higher the energy transmission efficiency is, so that the charging efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the field of wireless charging, and particularly relates to a wireless charging device and an electronic pen. Background Art

[0002] Wireless charging has become one of the commonly used charging methods nowadays. The basic principle of wireless charging is to apply alternating current with a certain frequency to the transmitting coil to generate a magnetic field. Through electromagnetic induction, a certain current is generated in the receiving coil within the magnetic field, thereby realizing the transfer of energy from the transmission end to the receiving end. However, the charging efficiency of wireless charging in the prior art needs to be improved. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a wireless charging device capable of improving the charging efficiency.

[0004] The utility model also provides an electronic pen with the above wireless charging device.

[0005] The wireless charging device according to the first aspect embodiment of the utility model includes a charging coil and a shielding layer. The charging coil has a first surface and a second surface. The first surface is used to face the receiving coil, and a current is generated in the receiving coil after the charging coil is energized. The second surface is arranged opposite to the first surface, and the shielding layer is arranged facing the second surface. The shielding layer is used to shield the magnetic field on the side of the second surface of the charging coil.

[0006] The wireless charging device according to the embodiments of the present invention has at least the following beneficial effects: In the prior art, a shielding layer is not provided on one side of the second surface of the charging coil, and the magnetic field intensities on the first surface and the second surface are approximately equal. However, only the magnetic field on one side of the first surface is used to interact with the external coil for wireless charging, and the magnetic field generated on the second surface side does not participate in wireless charging. Therefore, the wireless charging efficiency is relatively low. The wireless charging device according to the embodiments of the present invention is provided with a shielding layer on the back of the first surface for charging. A large number of free electrons exist inside the shielding layer, and these electrons can move freely inside the shielding layer. When the shielding layer is placed in a magnetic field, these free electrons will be affected by the magnetic field and start to move, forming an induced current. In the shielding layer, this induced current will generate a magnetic field opposite to the direction of the original magnetic field, that is, an anti-magnetic field. When the intensity of the anti-magnetic field is equal to the intensity of the original magnetic field, the two will cancel each other out, thereby forming a region with a significantly reduced magnetic field intensity on one side of the shielding layer, that is, the magnetic field is shielded. At this time, the shielding layer will guide the direction of the magnetic force lines, causing the magnetic force lines that might originally be evenly distributed to deflect under the action of the shielding layer. This deflection leads to a weakening of the magnetic field intensity on the shielded side (i.e., one side of the second surface), while on the other side, the magnetic field intensity increases due to the concentration of magnetic force lines (i.e., the first surface facing the receiving coil). Moreover, the magnetic force lines also have a squeezing effect. When one side is blocked, the magnetic force lines will find other paths to pass through, resulting in a squeezing effect on the unblocked side and causing the magnetic field intensity on that side to increase relatively. The increase in the magnetic field intensity on the first surface side means an increase in the magnetic coupling intensity between the charging coil and the receiving coil. The higher the magnetic coupling intensity, the higher the energy transmission efficiency. Therefore, the charging efficiency can be improved.

[0007] According to some embodiments of the present invention, the wireless charging device includes a charging coil and a shielding layer. The charging coil has a first surface and a second surface. The first surface is used to face the transmitting coil. After the transmitting coil is powered on, a current is generated in the charging coil. The second surface is arranged opposite to the first surface. The shielding layer is arranged facing the second surface, and the shielding layer is used to shield the magnetic field on the second surface side of the charging coil. The wireless charging device according to the embodiments of the present invention has at least the following beneficial effects: The shielding layer is arranged within the magnetic field range after the charging coil generates current, and it can also enhance the magnetic field intensity of the first surface facing the transmitting coil, thereby increasing the magnetic coupling intensity between the charging coil and the transmitting coil. The higher the magnetic coupling intensity, the higher the energy transmission efficiency. Therefore, the charging efficiency can also be improved.

[0008] According to some embodiments of the present invention, the shielding layer is a metal sheet.

[0009] According to some embodiments of the present invention, the metal sheet is a copper sheet.

[0010] According to some embodiments of the present utility model, the wireless charging device further includes a mandrel, the charging coil is wound around the mandrel, and the material of the mandrel is ferrite.

[0011] According to some embodiments of the present utility model, the wireless charging device further includes a bracket, the bracket has a receiving cavity, the charging coil is placed in the receiving cavity, the shielding layer is disposed between the charging coil and the bottom wall of the receiving cavity, or the shielding layer is disposed on a surface of the bracket opposite to the charging coil.

[0012] According to some embodiments of the present utility model, the first surface and the second surface are sequentially spaced along a first direction, the charging coil includes a winding portion wound around the mandrel, and a projection of the winding portion on the shielding layer along the first direction is completely located within the outer edge of the shielding layer.

[0013] According to some embodiments of the present utility model, the wireless charging device further includes a circuit board, the circuit board and the charging coil are respectively disposed on two sides of the shielding layer, the shielding layer is fixedly connected to the circuit board, the charging coil includes a winding portion, a first lead-out wire and a second lead-out wire, and the first lead-out wire and the second lead-out wire are respectively connected to two ends of the winding portion. The circuit board is provided with a first groove, and at least a part of the first lead-out wire and at least a part of the second lead-out wire are located in the first groove. And / or, the shielding layer is provided with a second groove, and at least a part of the first lead-out wire and at least a part of the second lead-out wire are located in the second groove.

[0014] According to some embodiments of the present utility model, at least a part of the first lead-out wire and at least a part of the second lead-out wire are welded to the inner wall surface of the first groove.

[0015] According to some embodiments of the present utility model, the shielding layer includes a positioning portion, the circuit board is provided with a positioning hole, and at least a part of the positioning portion is located in the positioning hole.

[0016] The electronic pen according to the second aspect embodiment of the present utility model includes the wireless charging device in any one of the embodiments of the present utility model.

[0017] The electronic pen according to the embodiment of the present utility model has at least the following beneficial effects: Preferably, the wireless charging device is used as a receiving end to charge the electronic pen, but the wireless charging coil can also be used as a transmitting end to enable the electronic pen to have a reverse charging function. Whether the wireless charging device is used as a receiving end or a transmitting end, by disposing the shielding layer on a surface of the charging coil opposite to the external coil, the magnetic field intensity of the first surface facing the external coil can be enhanced within the magnetic field range generated by the charging coil, so that the magnetic coupling strength between the charging coil and the external coil is increased. The higher the magnetic coupling strength, the higher the energy transmission efficiency, and thus the charging efficiency can also be improved.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments, where:

[0020] Figure 1 is the first perspective view of the wireless charging device in an embodiment of the present utility model;

[0021] Figure 2 is the second perspective view of the wireless charging device in an embodiment of the present utility model;

[0022] Figure 3 is the exploded view of the wireless charging device in an embodiment of the present utility model;

[0023] Figure 4 is the top view of the wireless charging device in an embodiment of the present utility model;

[0024] Figure 5 is the exploded view of the wireless charging device in the second embodiment of the present utility model;

[0025] Figure 6 is the perspective view of the wireless charging device in the second embodiment of the present utility model.

[0026] Reference numerals: wireless charging device 100, charging coil 101, first surface 102, second surface 103, shielding layer 104, mandrel 105, circuit board 106, first lead 107, second lead 108, positioning portion 109, positioning hole 110, through hole 111, first groove 201, second groove 202, first section 301, second section 302, third section 303, third groove 304, winding portion 305, double-sided adhesive 306, magnetic shielding portion 307, bracket 501, accommodating cavity 502. Detailed Embodiments

[0027] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0028] In the description of the present utility model, it should be understood that for the orientation descriptions, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, the meaning of "a number of" is more than one, the meaning of "a plurality of" is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the recited number, and understandings such as above, below, within, etc. include the recited number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0030] In the description of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. Those skilled in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0031] In the description of the present utility model, the descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0032] Refer to Figure 1, the wireless charging device 100 according to the first aspect embodiment of the present utility model includes a charging coil 101 and a shielding layer 104. The charging coil 101 has a first surface 102 and a second surface 103. The first surface 102 is used to face the receiving coil. After the charging coil 101 is energized, a current is generated in the receiving coil. The second surface 103 is arranged opposite to the first surface 102. The shielding layer 104 is arranged facing the second surface 103. The shielding layer 104 is used to shield the magnetic field on one side of the second surface 103 of the charging coil 101. In this embodiment, the function of the charging coil 101 is actually the same as that of the transmitting coil. In the prior art, there is no shielding layer 104 on one side of the second surface 103 of the charging coil 101, and the magnetic field intensities of the first surface 102 and the second surface 103 are approximately equal. However, only the magnetic field on one side of the first surface 102 is used to interact with the external coil for wireless charging, and the magnetic field generated on one side of the second surface 103 does not participate in wireless charging. Therefore, the wireless charging efficiency is relatively low. The wireless charging device 100 of the embodiment of the present utility model is provided with a shielding layer 104 on the back of the first surface 102 for charging (i.e., the second surface 103). A large number of free electrons exist inside the shielding layer 104, and these electrons can move freely inside the shielding layer 104. When the shielding layer 104 is placed in a magnetic field, these free electrons will be affected by the magnetic field and start to move, forming an induced current. In the shielding layer 104, this induced current will generate a magnetic field opposite to the direction of the original magnetic field, that is, an anti-magnetic field. When the intensity of the anti-magnetic field is equal to the intensity of the original magnetic field, the two will cancel each other out, thereby forming a region with a significantly reduced magnetic field intensity on one side of the shielding layer 104, that is, the magnetic field is shielded. At this time, the shielding layer 104 will guide the direction of the magnetic force lines, causing the originally evenly distributed magnetic force lines to deflect under the action of the shielding layer 104. This deflection results in the weakening of the magnetic field intensity on the shielded side (i.e., one side of the second surface 103), while on the other side, the magnetic field intensity increases due to the concentration of the magnetic force lines (i.e., the first surface 102 facing the receiving coil). Moreover, the magnetic force lines also have a squeezing effect. When one side is blocked, the magnetic force lines will find other paths to pass through, resulting in a squeezing effect on the unblocked side, causing the magnetic field intensity on that side to increase relatively. The increase in the magnetic field intensity on one side of the first surface 102 means an increase in the magnetic coupling intensity between the charging coil 101 and the receiving coil. The higher the magnetic coupling intensity, the higher the energy transmission efficiency. Therefore, the charging efficiency can be improved. At the same time, in some embodiments of the present utility model, the shielding layer 104 is in a flat plate shape, which has a simpler processing technology and a smaller occupied volume compared to other shapes such as a frame shape. It can improve the charging efficiency while reducing the material cost and processing cost.

[0033] Reference Figure 1, according to some embodiments of the present utility model, the wireless charging device 100 includes a charging coil 101 and a shielding layer 104. The charging coil 101 has a first surface 102 and a second surface 103. The first surface 102 is used to face the transmitting coil. After the transmitting coil is powered on, a current is generated in the charging coil 101, and the second surface 103 is arranged opposite to the first surface 102. In this embodiment, the function of the charging coil 101 is actually the same as that of the receiving coil. The shielding layer 104 is arranged facing the second surface 103, and the shielding layer 104 is used to shield the magnetic field on the side of the second surface 103 of the charging coil 101. When the shielding layer 104 is arranged within the magnetic field range generated after the charging coil 101 generates a current, it can also enhance the magnetic field intensity of the first surface 102 facing the transmitting coil, thereby increasing the magnetic coupling intensity between the charging coil 101 and the transmitting coil. The higher the magnetic coupling intensity, the higher the energy transmission efficiency. Therefore, the charging efficiency can also be improved.

[0034] In some embodiments of the present utility model, the shielding layer 104 is a metal sheet. There are more free electrons in the metal sheet, which are more active and have better electrical conductivity. Therefore, it can also have a better shielding effect. In some embodiments of the present utility model, the shielding layer 104 can also be made of other materials such as alloys and intermetallic compounds.

[0035] In some embodiments of the present utility model, the metal sheet is a copper sheet. Copper has higher electrical conductivity than common metals such as aluminum and iron, and the free electrons inside are more active. As a shielding sheet, it can have a better shielding effect, thereby increasing the charging efficiency. And in some embodiments of the present utility model, the shielding layer 104 is formed by stamping. The copper material has good processing ductility, which is convenient for stamping and can meet the requirements of different shapes and sizes. Moreover, copper also has good thermal conductivity. During the operation of the charging coil 101, heat is generated. Copper can well absorb and transfer the heat of the charging coil 101, reducing the impact of temperature rise on the charging efficiency. It should be noted that preferably, the copper material used in some embodiments of the present utility model is electrolytic copper, which refers to high-purity copper with a copper content of more than 99.9%. Due to its high purity, the electrical conductivity, thermal conductivity and ductility of electrolytic copper are better than those of ordinary copper materials with lower copper content. Therefore, the charging efficiency and the heat dissipation function of the charging coil 101 can be further improved.

[0036] It should be noted that in some embodiments of the present utility model, the surface of the shielding layer 104 is also insulated. As will be described below, in some embodiments of the present utility model, a circuit board 106 is further installed on the surface of the shielding layer 104 opposite to the charging coil 101. Therefore, insulating the surface of the shielding layer 104 can reduce the short - circuit risk between the charging coil 101 and the circuit board 106. Specifically, methods such as spraying or electroplating can be used for surface insulation treatment. It should be noted that in some embodiments of the present utility model, the bonding of the circuit board 106 to the shielding layer 104 is actually bonding to the insulating film after insulation treatment.

[0037] It should be noted that referring to Figure 1 and Figure 3 , in some embodiments of the present utility model, through - holes 111 are further formed on the shielding layer 104. External thin ropes or thin rod structures can pass through the through - holes 111, so as to better insulate the surface everywhere, which is convenient and efficient and can process multiple shielding layers 104 simultaneously.

[0038] In some embodiments of the present utility model, the wireless charging device 100 further includes a core rod 105. The charging coil 101 is wound around the core rod 105, and the material of the core rod 105 is ferrite. The core rod 105 can concentrate the magnetic field lines around the charging coil 101, increase the magnetic field strength, and improve the inductance efficiency. Moreover, winding the charging coil 101 on the core rod 105 can also increase the mechanical strength of the charging coil 101, avoiding deformation due to impact during use. Using ferrite as the core rod 105 is because ferrite is a high - frequency magnetic - conductive material with excellent magnetic - conductive performance, which can increase the inductance of the charging coil 101 and improve the charging efficiency. At the same time, ferrite has the characteristic of low magnetic loss, which can effectively convert and transfer electrical energy during the charging process, reduce energy loss, and improve the charging efficiency. And ferrite can be manufactured into various shapes and sizes to meet the requirements of different charging coils 101 and application scenarios. For example, referring to Figure 3 , in some embodiments of the present utility model, the ferrite core rod 105 is manufactured into an I - shape to facilitate winding the coil. In addition to ferrite, other magnetic materials such as neodymium iron boron can also be used for the core rod 105.

[0039] Referring to Figure 5 and Figure 6 , in some embodiments of the present utility model, the wireless charging device 100 further includes a bracket 501. The bracket 501 has a receiving cavity 502. The charging coil 101 is placed in the receiving cavity 502, and the shielding layer 104 is disposed between the charging coil 101 and the bottom wall of the receiving cavity 502 (the shielding layer 104 shown by the solid - line part in Figure 5 ), or the shielding layer 104 is disposed on the surface of the bracket 501 opposite to the charging coil 101 ( Figure 5The shielding layer 104 shown by the dashed line part in []. Such a design can make the structure of the charging coil 101 more stable, the overall structure more compact, and the bracket 501 can also place other components such as magnetic components and electrical connectors to meet more usage requirements.

[0040] It should be noted that referring to Figure 3 , in some embodiments of the present invention, the mandrel 105 includes a first section 301, a second section 302, and a third section 303 distributed along the axial direction of the charging coil 101. The first section 301 and the third section 303 are respectively connected to both ends of the second section 302. Both the first section 301 and the third section 303 are connected to the shielding layer 104. The charging coil 101 is wound around the second section 302. The outer peripheral surfaces of the first section 301 and the third section 303 both protrude relative to the outer peripheral surface of the second section 302, so that the first section 301, the second section 302, and the third section 303 jointly define a third groove 304, and the charging coil 101 is located in the third groove 304. Designing the mandrel 105 into an I-shape and forming the third groove 304 can improve the space utilization rate, so that the mandrel 105 wound with the charging coil 101 will not have a large increase in occupied space, and the protrusion of the first section 301 and the third section 303 relative to the second end can better connect the mandrel 105 and the shielding layer 104, so that the shielding layer 104 is located on one side of the second surface 103 and within the magnetic field range of the charging coil 101.

[0041] In some embodiments of the present invention, when the material of the mandrel 105 is ferrite, the connection between the mandrel 105 and the shielding layer 104 is achieved by dispensing glue. Because ferrite is fragile, dispensing glue will not generate excessive pressure, high temperature, or chemical reactions on the ferrite, and can maintain the structural stability. In some embodiments of the present invention, the mandrel 105 and the shielding layer 104 are pre-assembled as a whole and then connected to the circuit board 106 together. Because the magnetic field intensity distribution and performance of the charging coil 101 with the shielding layer 104 placed around it are pre-tested, and after debugging, it is connected to the circuit board 106. In this way, the quality stability of the product can be improved. It should be noted that in addition to dispensing glue, connection methods such as bonding and pasting can also be used.

[0042] It should be noted that referring to Figure 1 and Figure 3, in some embodiments of the present utility model, the cross-section of the mandrel 105 in the first direction is rectangular. In this way, after the charging coil 101 is wound around the mandrel 105, the first surface 102 and the second surface 103 are rectangular and have a relatively large area. At the same time, the rectangular mandrel 105 is also easy to process. In some embodiments of the present utility model, the mandrel 105 can also be circular or other shapes. The surface facing the external coil is the first surface 102, and the surface opposite thereto is the second surface 103. At this time, the first surface 102 and the second surface 103 are arc-shaped or other irregular shapes.

[0043] Reference Figure 1 and Figure 4 , in some embodiments of the present utility model, the first surface 102 and the second surface 103 are sequentially arranged at intervals in the first direction. The charging coil 101 includes a winding portion 305. The winding portion 305 is wound around the mandrel 105. The projection of the winding portion 305 on the shielding layer 104 in the first direction is completely located inside the outer edge of the shielding layer 104. The area of the shielding layer 104 being larger than the area of the winding portion 305 enables the shielding layer 104 to shield more magnetic fields, increasing the shielding effect, and thus increasing the magnetic field strength and charging efficiency on the other side. Preferably, the projected area of the shielding layer 104 in the first direction is larger than the projected area of the mandrel 105 in the first direction, so as to further improve the charging efficiency.

[0044] Reference Figure 2 and Figure 3 , in some embodiments of the present utility model, the wireless charging device 100 further includes a circuit board 106. The circuit board 106 and the charging coil 101 are respectively arranged on both sides of the shielding layer 104. The shielding layer 104 is fixedly connected to the circuit board 106. The charging coil 101 includes a winding portion 305, a first lead 107, and a second lead 108. The first lead 107 and the second lead 108 are respectively connected to both ends of the winding portion 305. The circuit board 106 is provided with a first groove 201. At least part of the first lead 107 and at least part of the second lead 108 are located in the first groove 201. And / or, the shielding layer 104 is provided with a second groove 202. At least part of the first lead 107 and at least part of the second lead 108 are located in the second groove 202. Providing the first groove 201 and the first groove 201 can reduce the occupied space of the first lead 107 and the second lead 108, making the overall structure more compact and the layout more reasonable. It should be noted that, reference Figure 3 and Figure 4 , in some embodiments of the present utility model, the shielding layer 104 and the circuit board 106 are bonded by a double-sided adhesive tape 306. The use of the double-sided adhesive tape 306 is convenient and fast, and can adapt to different length requirements. The bonding area is large, the viscosity is strong, and there is no need to do cumbersome processing, and the stability is strong. ReferenceFigure 4 , in some embodiments of the present utility model, a part of the double-sided adhesive 306 also extends relative to the circuit board 106. Such a design can make it more convenient to tear off the protective film on the surface of the double-sided adhesive 306 before bonding, improving the processing efficiency. In addition to the double-sided adhesive 306, the shielding layer 104 and the circuit board 106 can also be fixedly connected by means of welding, dispensing, etc.

[0045] Reference Figure 2 , in some embodiments of the present utility model, at least a part of the first lead wire 107 and at least a part of the second lead wire 108 are welded to the inner wall surface of the first groove 201. Welding a part of the first lead wire 107 and the second lead wire 108 to the inner wall surface of the first groove 201 can prevent the first lead wire 107 and the second lead wire 108 from shaking and improve the overall structural stability.

[0046] Reference Figure 1 、 Figure 3 And Figure 4 , in some embodiments of the present utility model, the shielding layer 104 includes a positioning portion 109, a positioning hole 110 is formed on the circuit board 106, and at least a part of the positioning portion 109 is located in the positioning hole 110. Such a design can make the position of the shielding layer 104 more accurate when connecting with the circuit board 106, ensuring the processing quality. And, reference Figure 1 、 Figure 3 And Figure 4 , in some embodiments of the present utility model, the positioning portion 109 is formed by directly stamping and bending the shielding layer 104, which is formed in one step, with a simple and effective structure. The positioning portion 109 can also play a role in fixing the shielding layer 104 on the circuit board 106 to a certain extent.

[0047] It should be noted that, reference Figure 1 And Figure 3 , in some embodiments of the present utility model, the shielding layer 104 further includes a magnetic shielding portion 307. The magnetic shielding portion 307 is in a flat plate shape, the positioning portion 109 is arranged at both ends of the magnetic shielding portion 307, the magnetic shielding portion 307 is the main part for shielding the magnetic field on one side of the second surface 103 of the charging coil 101, and a second groove 202 and a through hole 111 are formed on the magnetic shielding portion 307. In some embodiments of the present utility model, the magnetic shielding portion 307 is arranged at an interval from the charging coil 101, so as to avoid the shielding layer 104 from rubbing and wearing the charging coil 101.

[0048] An electronic pen according to a second aspect embodiment of the present utility model includes the wireless charging device 100 in any one of the embodiments of the present utility model. Preferably, the wireless charging device 100 is used as a receiving end to charge the electronic pen, that is, the charging coil 101 is arranged inside the electronic pen as a receiving coil, and the transmitting coil is located in an external device such as a charging stand or a charger; however, in some other embodiments, the wireless charging coil 101 can also be used as a transmitting end, that is, the charging coil 101 inside the electronic pen is used as a transmitting coil, and the receiving coil is located in an electronic device such as a bracelet, a ring or a watch to be charged, so that the electronic pen has a reverse charging function. Whether the wireless charging device 100 is used as a receiving end or a transmitting end, the magnetic field intensity towards the first surface 102 of the external coil can be enhanced within the magnetic field range generated by the charging coil 101 by arranging the shielding layer 104 on the surface of the charging coil 101 opposite to the external coil, thereby increasing the magnetic coupling intensity between the charging coil 101 and the external coil. The higher the magnetic coupling intensity, the higher the energy transmission efficiency, so the charging efficiency can also be improved.

[0049] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the present utility model pertains, various changes can be made without departing from the gist of the present utility model. In addition, the embodiments of the present utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A wireless charging device, characterized in that, Comprising: A charging coil having a first surface and a second surface, the first surface being for facing a receiving coil, a current being generated in the receiving coil after the charging coil is energized, and the second surface being disposed opposite to the first surface; A shielding layer disposed facing the second surface, the shielding layer being for shielding the magnetic field on the side of the second surface of the charging coil.

2. Wireless charging device, characterized in that, Comprising: A charging coil having a first surface and a second surface, the first surface being for facing a transmitting coil, a current being generated in the charging coil after the transmitting coil is energized, and the second surface being disposed opposite to the first surface; A shielding layer disposed facing the second surface, the shielding layer being for shielding the magnetic field on the side of the second surface of the charging coil.

3. The wireless charging device according to claim 2, wherein The shielding layer is a metal sheet.

4. The wireless charging device according to claim 3, wherein The metal sheet is a copper sheet.

5. The wireless charging device according to claim 2, wherein The wireless charging device further includes a mandrel around which the charging coil is wound, and the mandrel is made of ferrite.

6. The wireless charging device according to claim 2, wherein The wireless charging device further includes a bracket having a receiving cavity, the charging coil being placed in the receiving cavity, and the shielding layer being disposed between the charging coil and the bottom wall of the receiving cavity, or the shielding layer being disposed on a surface of the bracket opposite to the charging coil.

7. The wireless charging device according to claim 5, characterized in that The first surface and the second surface are sequentially spaced apart along a first direction, the charging coil includes a winding portion wound around the mandrel, and a projection of the winding portion on the shielding layer along the first direction is completely located within the outer edge of the shielding layer.

8. The wireless charging device according to claim 2, wherein, The wireless charging device further includes a circuit board, the circuit board and the charging coil being respectively disposed on two sides of the shielding layer, the shielding layer being fixedly connected to the circuit board, and the charging coil includes a winding portion, a first lead wire and a second lead wire, the first lead wire and the second lead wire being respectively connected to two ends of the winding portion; The circuit board is provided with a first groove, and at least a part of the first lead wire and at least a part of the second lead wire are located in the first groove; And / or The shielding layer is provided with a second groove, and at least a part of the first lead wire and at least a part of the second lead wire are located in the second groove.

9. The wireless charging device according to claim 8, characterized in that, At least a part of the first lead wire and at least a part of the second lead wire are welded to the inner wall surface of the first groove.

10. The wireless charging device according to claim 8, characterized in that, The shielding layer includes a positioning portion, the circuit board is provided with a positioning hole, and at least a part of the positioning portion is located in the positioning hole.

11. An electronic pen, characterized in that, The electronic pen includes the wireless charging device according to any one of claims 1 to 10.

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