CN115296437A

CN115296437A - Wireless charging device and wireless charging system

Info

Publication number: CN115296437A
Application number: CN202211235172.8A
Authority: CN
Inventors: 武渊; 王朝; 马雷; 马骋宇
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2022-11-04

Abstract

A wireless charging device and a wireless charging system relate to the technical field of terminals and the technical field of wireless charging. The charging component of the wireless keyboard comprises an inner layer support structure, an outer layer support structure, a transmitting end coil and a soft magnetic material layer; the inner layer support structure surrounds to form a containing cavity, and the containing cavity is used for containing the handwriting pen; the transmitting end coil and the soft magnetic material layer are arranged in a cavity formed by the inner layer support structure and the outer layer support structure. The transmitting end coil is wound around the inner-layer support structure, so that when the stylus pen is positioned in the accommodating cavity, the receiving end coil of the stylus pen is at least partially positioned in a hollow area formed by winding the transmitting end coil; a soft magnetic material layer surrounds the outside of the transmitting end coil. According to the scheme, the coupling coefficient between the transmitting end coil and the receiving end coil is improved, so that the charging efficiency is improved, and the charging time is shortened. In addition, the number of turns of the required transmitting end coil can be reduced, the size of the transmitting end coil is reduced, and the miniaturization design is facilitated.

Description

Wireless charging device and wireless charging system

Technical Field

The application relates to the technical field of terminals, in particular to a wireless charging device and a wireless charging system.

Background

At present, in order to increase the operation convenience of electronic devices such as tablet computers or mobile phones, a stylus pen is configured for the electronic devices. In order to ensure the aesthetic property of industrial design of the stylus pen, the current mainstream mode is to adsorb the stylus pen on the electronic equipment, and the charging mode of the stylus pen adopts wireless charging so as to avoid setting a wired charging interface.

However, the size of the stylus volume dictates that its battery capacity and therefore wireless charging power cannot be too great. The mainstream charging architecture is of an adsorption type, and specifically, refer to fig. 1, which is a first scene schematic diagram provided by the present application. When the stylus pen 10 is attached to the electronic device 20, the stylus pen 10 and the electronic device 20 have an interface, the transmitting coil 21 is on one side of the interface, and the receiving coil 11 is on the other side of the interface. When the implementation mode is adopted, because the transmitting end coil 21 and the receiving end coil 11 are generally placed in parallel, the coupling coefficient is lower during charging, the charging efficiency is reduced, and the charging time is longer.

Disclosure of Invention

In order to solve the above problem, the present application provides a wireless charging device and a wireless charging system, which improve charging efficiency and shorten charging time.

In a first aspect, the present application provides a wireless keyboard comprising a charging component. The charging component comprises an inner layer bracket structure, an outer layer bracket structure, a transmitting end coil and a magnetic material layer; the inner layer support structure surrounds to form a containing cavity, one end of the containing cavity comprises an opening, and the containing cavity is used for containing the handwriting pen through the opening; the transmitting end coil and the magnetic material layer are arranged in a cavity formed by the inner support structure and the outer support structure. The transmitting end coil is wound around the inner layer support structure, so that when the stylus pen is positioned in the accommodating cavity, the receiving end coil of the stylus pen is at least partially positioned in a hollow area formed by winding the transmitting end coil; the magnetic material layer surrounds the outer side of the transmitting end coil; the transmitting end coil is used for generating an alternating electromagnetic field by using alternating current.

When the handwriting pen is located and accomodates the intracavity, because the receiving terminal coil is in the cavity region that the coiling of transmitting terminal coil formed, compare in lieing in the scheme of contact surface both sides, this scheme has more magnetism to feel the line and passes through the receiving terminal coil for the coupling effect of receiving terminal coil and transmitting terminal coil promotes, and then has promoted charge efficiency, has shortened the charge time. Furthermore, a magnetic material layer is arranged on the outer side of the transmitting end coil, materials in the magnetic material layer can be soft magnetic materials such as nanocrystalline and the like, the magnetic conductivity is high, the saturation magnetic flux density is large, and the magnetic loss is small, so that magnetic induction lines can be better guided to form a loop, the charging efficiency of the handwriting pen is further improved, and the charging time length is further shortened. In addition, the number of turns of the required transmitting end coil can be reduced, on one hand, the overall impedance of the transmitting end coil is reduced, on the other hand, the size of the transmitting end coil is favorably reduced, and the miniaturization design is facilitated.

The magnetic material layer may completely surround the outer side of the transmitting end coil, or partially surround the outer side of the transmitting end coil.

In one possible implementation, the magnetic material layer includes a magnetic material that is one or more of the following: nanocrystalline materials, amorphous materials, silicon steel or ferrites.

When the inductance parameter of the transmitting end coil is fixed, the number of turns of the transmitting end coil can be reduced after the periphery of the transmitting end coil is coated with magnetic materials such as nanocrystalline, and the like, so that the alternating current impedance of the transmitting end coil is reduced, and the charging efficiency is improved.

In one possible implementation manner, the magnetic material layer comprises multiple layers of nanocrystalline materials, and the multiple layers of nanocrystalline materials are adhered through glue. The number of nanocrystalline layers that suitably increase magnetic material layer and include can increase the guide effect to magnetism line to a certain extent, but the number of nanocrystalline layers increases to certain upper limit after, and the guide effect to magnetism line promotes no longer obviously to increase. Thus, to balance hardware cost with processing complexity, the number of layers of nanocrystalline material comprising the magnetic material layer may be selected to be 3, 4, or 5 layers.

In one possible implementation, the thickness of the layer of magnetic material is less than 0.2 millimeters. The thickness of the single-layer nanocrystalline can reach 20um generally, when 5 layers of nanocrystalline are adopted, the thickness of the magnetic material layer is generally less than 0.2mm by adding glue between the layers.

In a possible implementation manner, each layer of nanocrystalline material in the multiple layers of nanocrystalline materials is subjected to fragmentation processing, so that the relative permeability of each layer of nanocrystalline material is stable, that is, the permeability of the nanocrystals at different positions of the magnetic material layer is not greatly changed, and the guiding effect of the magnetic induction lines is improved.

In one possible implementation, the relative permeability of each layer of nanocrystalline material is between 1000 and 3000

In one possible implementation, the magnetic material layer is affixed to the outside of the transmitting end coil.

At the moment, the magnetic material layer is relatively close to the transmitting end coil, the surface area of the magnetic material layer is relatively small, the required magnetic material is less, and the hardware cost is reduced.

In one possible implementation, the magnetic material layer is adhered to the outer side of the transmitting end coil. The adhesion difficulty of the magnetic material layer is low at this moment, and the magnetic material layer is firmer.

In one possible implementation, the wireless charging apparatus further includes: the wireless charging control system comprises a charging interface, a first charging control module, a first battery and a transmitting terminal wireless charging control module; the charging interface is used for connecting a power adapter or a power supply; the first end of the first charging control module is connected with the charging interface, and the second end of the first charging control module is connected with the first battery; the first end of the transmitting end wireless charging control module is connected with the first end of the first charging control module, and the second end of the transmitting end wireless charging control module is connected with the transmitting end coil; the first charging control module is used for charging the first battery by using direct current input by the charging interface or providing direct current for the transmitting terminal wireless charging control module; and the transmitting terminal wireless charging control module is used for converting the acquired direct current into alternating current and transmitting the alternating current to the transmitting terminal coil so as to enable the transmitting terminal coil to generate an alternating electromagnetic field.

In one possible implementation, the wireless charging device is a wireless keyboard, a stylus holding device, or a tablet computer.

In a possible implementation manner, the charging interface is any one of a Type-C interface, a Micro B interface or a POGO pin interface.

In a second aspect, the present application further provides a wireless charging system, which includes a handwriting pen and any one of the above wireless charging devices. When the handwriting pen is positioned in the containing cavity of the wireless charging device, at least part of the receiving end coil is positioned in a hollow area formed by winding the transmitting end coil. Compare in transmitting terminal coil and receiving terminal coil lie in contact surface both sides scheme respectively, this scheme has more magnetism to feel the line and passes through receiving terminal coil for receiving terminal coil and transmitting terminal coil's coupling effect promotes, and then has promoted charge efficiency, has shortened the charge time. Furthermore, a magnetic material layer is arranged on the outer side of the transmitting end coil, the magnetic material layer can be made of soft magnetic materials such as nanocrystalline and the like, the magnetic conductivity is high, the saturation magnetic flux density is high, and the magnetic loss is small, so that magnetic induction lines can be better guided to form a loop, the charging efficiency of the handwriting pen is further improved, and the charging time length is further shortened. In addition, the number of turns of the required transmitting end coil can be reduced, on one hand, the overall impedance of the transmitting end coil is reduced, on the other hand, the size of the transmitting end coil is favorably reduced, and the miniaturization design is facilitated.

Drawings

Fig. 1 is a first scenario diagram provided in the present application;

FIG. 2 is a schematic illustration of the magnetic induction lines corresponding to FIG. 1 provided herein;

FIG. 3 is a side view of the right side of FIG. 2 provided herein;

fig. 4 is a schematic view of a second scenario provided by the present application;

FIG. 5 is a side view of the corresponding left side of FIG. 4 as provided herein;

FIG. 6 is a schematic view of the wireless keyboard of the present application when receiving a stylus;

fig. 7A is a schematic diagram of a wireless keyboard with a function of wirelessly supplying power to a stylus pen according to the present application;

FIG. 7B is a schematic diagram of another wireless keyboard with a function of wirelessly supplying power to a stylus pen provided in the present application;

fig. 8 is a third scenario diagram provided by the present application;

FIG. 9 is a side view of a wireless keyboard according to an embodiment of the present application;

FIG. 10 is an enlarged view of area B of FIG. 9 according to an exemplary embodiment of the present disclosure;

fig. 11 is a top view of the wireless keyboard according to the embodiment of the present application after being fastened;

fig. 12A is a schematic diagram illustrating a first principle of wireless charging according to an embodiment of the present disclosure;

fig. 12B is a schematic diagram illustrating a second principle of wireless charging according to an embodiment of the present application;

fig. 12C is a schematic diagram of a wireless charging method when the magnetic material layer is not included according to an embodiment of the present application;

fig. 13 is a schematic diagram of an architecture of a wireless charging according to an embodiment of the present application;

FIG. 14 is a system diagram of a wireless keyboard according to an embodiment of the present application;

FIG. 15 is a schematic diagram of a stylus containment apparatus provided in an embodiment of the present application;

fig. 16 is a schematic diagram of an electronic device according to an embodiment of the present application;

fig. 17 is a schematic diagram of a wireless charging system according to an embodiment of the present application.

Detailed Description

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number or implicit order of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present embodiment, "a plurality" means two or more unless otherwise specified.

In order to make the technical solutions of the present application more clearly understood by those skilled in the art, an application scenario of the technical solutions of the present application is first described below.

See also fig. 2 and 3. Fig. 2 is a schematic view of a magnetic induction line corresponding to fig. 1 provided in the present application; fig. 3 is a side view of the right side of fig. 2, as provided herein.

When the stylus pen 10 is attached to the electronic device 20, the stylus pen 10 and the electronic device 20 have an interface AA1, the transmitting end coil 21 is on one side of the interface AA1, and the receiving end coil 11 is on the other side of the interface AA 1.

In this implementation, when the stylus pen 10 is charged, the electronic device 20 inputs an alternating current into the transmitting-end coil 21, the transmitting-end coil 21 generates an alternating electromagnetic field, and the forked symbol in fig. 3 indicates that the direction of the electromagnetic field at this time is perpendicular to the straight surface inward. The winding cross-sectional shapes of the transmitting end coil 21 and the receiving end coil 11 in fig. 3 are only one possible implementation manner, and do not constitute a limitation to the technical solution of the present application, and in practical applications, the cross-sections of the transmitting end coil 21 and the receiving end coil 11 may be respectively wound as a circle, a rectangle, a square, an ellipse, and the like, which is not specifically limited herein. After the alternating electromagnetic field passes through the receiving end coil 11, the receiving end coil 11 generates an alternating current. The stylus pen 10 includes a rectifying circuit, which rectifies the alternating current into a direct current and then charges a battery on the stylus pen 10.

The above is only one application scenario of the stylus 10, and other application scenarios are described below.

See also fig. 4-6. Fig. 4 is a schematic view of a scenario provided in the present application; FIG. 5 is a side view of the corresponding left side of FIG. 4 as provided herein; fig. 6 is a schematic view of the wireless keyboard according to the present application when a stylus pen is received.

The form of the wireless keyboard 30 is only one possible implementation manner, and other industrial designs may also be adopted, which are not described in detail in the embodiments of the present application.

The wireless keyboard 30 is fixed to the electronic device 20 and wirelessly connected thereto, and then can perform input through the keyboard main body 33. The wireless keyboard 30 is provided with a receiving cavity 31 at the junction of the keyboard main body 33 and the support 34. The housing chamber 31 can house the stylus pen 10 through the opening.

In some embodiments, wireless keyboard 30 may also be charged wirelessly, i.e., wireless keyboard 30 supports wireless charging by other components or devices, such as electronic device 20. The principle of wirelessly charging the wireless keyboard 30 can refer to the principle of wirelessly charging the stylus pen 10 by the wireless keyboard 30, and will not be described herein again.

In other embodiments, wireless keyboard 30 may also support wired charging. For example, the wireless keyboard 30 is charged by connecting a power source to a power adapter. Charging interface 32 of wireless keyboard 30 is used to connect a power adapter. In a possible implementation manner, the charging interface 32 may also be connected to a dc signal, such as a 5V dc signal, through a cable.

In fig. 5, the keyboard main body and the holder of the wireless keyboard 30 are combined, and the stylus pen 10 is inserted into the receiving cavity 31 through the opening. In fig. 6, the keyboard main body and the stand of the wireless keyboard 30 are combined, and the electronic apparatus 20 is separated from the wireless keyboard 30, and the stylus pen 10 is inserted into the receiving chamber 31 through the opening.

For the implementations of fig. 4-6, stylus 10 may continue to charge by attaching to electronic device 20 in the manner shown in fig. 2.

In yet another possible implementation, stylus 10 may be charged by a wireless keyboard, as described in more detail below.

See also fig. 7A and 7B. Fig. 7A is a schematic diagram of a wireless keyboard with a function of wirelessly supplying power to a stylus pen according to the present application; fig. 7B is a schematic diagram of another wireless keyboard with a function of wirelessly supplying power to a stylus pen according to the present application.

At this time, the transmitting end coil 21 is provided on the wireless keyboard 30, and fig. 7A and 7B are different in the relative position of the transmitting end coil 21 and the housing chamber 31.

The wireless keyboard 30 wirelessly charges the stylus pen 10 through the transmitting end coil 21.

In yet another possible implementation, stylus 10 may be charged by a stylus containing box, as described in more detail below.

Referring to fig. 8, this figure is a schematic view of a third scenario provided in the present application.

Stylus receiver 40 is used for holding the stylus, and for convenient placing, can design the recess of stylus receiver 40 and the appearance phase-match of stylus 10. At this time, the transmitter coil is provided in the stylus pen housing case 40 for wirelessly charging the stylus pen 10.

For the scenes shown in fig. 1, 4 and 8, the transmitting end coil 21 and the receiving end coil 11 are in the form of solenoids, and since the transmitting end coil 21 and the receiving end coil 11 are generally placed in parallel, the magnetic induction lines can be distributed as shown in fig. 3 during charging, and both have the problems of low coupling coefficient, thereby reducing charging efficiency and prolonging charging time.

In order to solve the above problem, the application provides a wireless charging device and wireless charging system, make wireless charging device when carrying out wireless charging to the writing pen, the receiving terminal coil of writing pen is included by wireless charging device's transmitting terminal coil, and surround being provided with the magnetic material layer of transmitting terminal coil in the outside of transmitting terminal coil, magnetic material adopts nanocrystalline material, amorphous material, silicon steel, magnetic conductivity such as ferrite is high, the little soft magnetic material of magnetic loss, guide magnetic induction line that can be better, form the return circuit, and then make the coupling coefficient between receiving terminal coil and the transmitting terminal coil promote, charging efficiency has been promoted, and charging time has been shortened, user experience has been promoted.

First, a wireless charging device is taken as an example of a wireless keyboard, and a description is given with reference to a specific implementation manner.

See also fig. 9-12B. Fig. 9 is a side view of a wireless keyboard according to an embodiment of the present application; FIG. 10 is an enlarged view of area B of FIG. 9 according to an exemplary embodiment of the present disclosure; fig. 11 is a top view of the wireless keyboard according to the embodiment of the present application after being fastened; fig. 12A is a schematic diagram illustrating a first principle of wireless charging according to an embodiment of the present disclosure; fig. 12B is a schematic diagram illustrating a second principle of wireless charging according to an embodiment of the present application.

The wireless keyboard includes a charging member 35, and the charging member 35 is located at a connection of the keyboard main body 33 and the stand 34.

Referring to fig. 10, the charging member 35 specifically includes an inner support structure 351 and an outer support structure 353. The inner support structure 351 and the outer support structure 353 form a space for accommodating the transmitting-end coil 21 and the magnetic material layer 352.

The charging member 35 includes a receiving chamber 31, and the receiving chamber 31 has a space for receiving the stylus pen 10. The cavity wall of the housing chamber 31, that is, the inner layer support structure 351, is denoted by 351 in the following description.

It can be understood that, in fig. 9, 10, 12A, 12B and 12C, in order to distinguish the boundaries of the stylus pen 10 and the receiving cavity 31 for easy understanding, the space of the receiving cavity 31 is enlarged appropriately, and in practical applications, when the receiving pen 10 is received in the receiving cavity 31, the cavity wall 351 of the receiving cavity 31 and the stylus pen 10 may not have an excessive gap, for example, the cavity wall of the receiving cavity 31 may contact with the stylus pen 10 to provide friction force, thereby improving the receiving effect of the stylus pen 10. Further, the cross section of the stylus pen 10 may be designed in an industrial manner, such as a circle, an ellipse, or other shapes, so that in order to accommodate the stylus pen 10, the accommodating cavity 31 also needs to be designed in an industrial manner corresponding to the cross section shape of the stylus pen 10.

The transmitting-end coil 21 and the magnetic material (soft magnetic material) layer 352 of the charging member 35 are located in a space formed by the inner layer support structure 351 and the outer layer support structure 353.

The transmitting end coil 21 is wound around the inner support structure 351, and the inner support structure 351 plays a role in supporting the transmitting end coil 21. When the stylus pen 10 is located in the receiving cavity 31, the receiving end coil 11 of the stylus pen 10 is located in the hollow area formed by winding the transmitting end coil 21, compared with the implementation shown in fig. 3, more magnetic induction lines can pass through the receiving end coil 11, and therefore the coupling coefficient between the transmitting end coil 21 and the receiving end coil 11 is enhanced.

The coil winding direction, the winding shape of the cross section, the diameter of the wire for winding the coil, the material of the wire for winding the coil, the number of layers of the coil, and the number of strands of the coil of the transmitting-end coil 21 are not particularly limited in the embodiment of the present application.

The transmitting end coil 21 and the inner layer support structure 351 may be fixed by glue or by a limiting structure, which is not specifically limited in this embodiment of the present application.

The magnetic material layer 352 is located outside the transmitting-side coil 21. Referring to fig. 10, an outer layer of magnetic material 352 is disposed around the transmitting end coil 21. The magnetic material layer may be a soft magnetic material layer. Soft magnetic materials generally refer to magnetic materials having a low coercivity (Hc) and a high magnetic permeability (magnetic permeability). Coercivity, also known as coercivity or coercive force, is one of the properties of a magnetic material and refers to the strength of the magnetic field required to reduce the magnetization of the magnetic material to zero after it has been magnetized to magnetic saturation. Magnetic permeability is a physical quantity that characterizes the magnetism of a magnetic medium, and represents the resistance of magnetic flux generated by a coil in space or in magnetic core space after current flows through the coil or the coil in space or the magnetic core space or the ability of the coil to conduct magnetic lines in a magnetic field. Permeability characterizes a material's ability to conduct magnetic flux, and given magnetic induction, the smaller the magnetic field strength used, the greater its permeability.

Typical soft magnetic materials can achieve large magnetization intensity with a small external magnetic field, and are easy to magnetize and demagnetize. Specifically, the soft magnetic material refers to a material in which magnetization Hc is not more than 1000A/m.

The magnetic material layer 352 in the embodiment of the present application may specifically adopt a nanocrystalline material, an amorphous material, silicon steel, ferrite, and other materials with high magnetic permeability and small magnetic loss, and can better guide the magnetic induction line to form a loop. The magnetic material layer 352 may be one of the above materials or a combination of materials.

Wherein the nanocrystalline material is a material formed by crystals with nanoscale size (1 to 10nm). Since the crystals are extremely fine, the grain boundaries may account for 50% or more of the entire material. The arrangement of atoms is different from an ordered crystalline state and from a disordered amorphous state (glassy state). Its properties are also different from those of a crystal or amorphous of the same composition. The nanocrystalline material has high magnetic permeability (the relative magnetic permeability can reach more than 10 ten thousand). The nanocrystalline material with high magnetic permeability is used, so that the magnetic induction lines of the transmitting end coil 21 can be well guided to form a loop, the coupling coefficient of the transmitting end coil 21 and the receiving end coil 11 is further enhanced, and the number of turns of the transmitting end coil 21 is further reduced.

The amorphous material is an alloy without long-range order and crystal grains, is also called as metallic glass or amorphous metal, and has the characteristic of high magnetic permeability (the relative magnetic permeability can reach more than 10 ten thousand).

The silicon content of the silicon steel material is generally 0.5-4.8%, and the silicon steel material is generally made into a thin plate which is commonly called a silicon steel sheet. After the silicon is added into the pure iron, the phenomenon that the magnetism of the magnetic material changes along with the use time can be eliminated. The magnetic material has the characteristics of high magnetic conductivity (the relative magnetic conductivity can reach 7000-10000) and coercive force.

Ferrite is a composite oxide mainly composed of iron oxide and other iron group or rare earth group oxides, and has high magnetic permeability, for example, the relative magnetic permeability of NiZn (MgZn) ferrite can reach 4000, and the relative magnetic permeability of MnZn ferrite can reach 30000.

In one possible implementation, referring to fig. 12A, the magnetic material layer 352 and the outer side of the transmitting end coil 21 are fixed by gluing. At this time, because the magnetic material layer 352 is relatively close to the transmitting-end coil 21, the surface area of the magnetic material layer 352 is relatively small, the required magnetic material is less, and the hardware cost is reduced, and because the magnetic material layer 352 is tightly attached to the transmitting-end coil 21, air with low magnetic permeability is prevented from being mixed with the transmitting-end coil 21, more magnetic induction lines can be guided to form a closed loop, and the coupling coefficient between the transmitting-end coil 21 and the receiving-end coil 11 is improved as much as possible.

In another possible implementation, referring to fig. 12B, the magnetic material layer 352 may be fixed to the outer support structure 353 by cutting and pasting with glue. In this case, the magnetic material layer 352 has lower adhesion difficulty and is more firm than the scheme of fig. 12A.

Comparing the schematic diagram of the wireless charging in the case of not including the magnetic material layer shown in fig. 12C with fig. 12A and 12B, it can be seen that when the magnetic material layer 352 is not provided, since the magnetic induction lines are not guided, the magnetic induction line loops passing through the receiving-end coil 11 are sparse and small in number. At this time, the coupling coefficient of the transmitting end coil 21 and the receiving end coil 11 is improved compared to the corresponding scheme of fig. 3, but is still relatively small. After the magnetic material layer 352 is added, the magnetic material layer guides the magnetic induction lines, so that the magnetic induction lines passing through the receiving end coil 11 are more dense and more numerous, and therefore the coupling coefficient between the transmitting end coil 21 and the receiving end coil 11 is further improved.

Comparing the two implementations of fig. 12A and 12B, it can be seen that, in fig. 12A, by fixing the magnetic material layer 352 on the transmitting-end coil 21, that is, by making the magnetic material layer 352 as close to the transmitting-end coil 21 as possible, more magnetic induction lines can be guided to form a closed loop compared to the implementation of fig. 12B, and the coupling coefficient between the transmitting-end coil 21 and the receiving-end coil 11 is further improved.

In practical applications, because the magnetic permeability of the nanocrystalline material is higher and the magnetic loss is smaller compared to other materials, the effect of improving the coupling coefficient between the transmitting end coil 21 and the receiving end coil 11 is better, and thus in a better implementation mode, the magnetic material used in the magnetic material layer 352 is a nanocrystalline material.

In addition, the thickness of the magnetic material layer 352 is not particularly limited in the embodiments of the present application. In one possible implementation, the magnetic material layer 352 is made of a nanocrystalline material that has been subjected to a pulverization process. The pulverization treatment is to stabilize the magnetic permeability of the nanocrystals, that is, to make the magnetic permeability of the nanocrystals at different positions of the magnetic material layer 352 not greatly changed, thereby improving the effect of guiding the magnetic induction lines. The relative magnetic permeability of the crushed nano-crystal is between 1000 and 3000.

In practical application, the thickness of the single-layer nanocrystal can reach 20um. The magnetic material layer 352 may include multiple layers of nanocrystals, such as 3 or more layers. Taking the example that the magnetic material layer 352 includes three layers of nanocrystals, the three layers of nanocrystals are fixed by gluing, and the thickness of the magnetic material layer 352 is about 87um by the glue between the layers. Through test research, it is found that the number of layers of the nanocrystals included in the magnetic material layer 352 is properly increased, so that the guiding effect on the magnetic induction lines can be increased to a certain extent, but after the number of layers of the nanocrystals is increased to a certain upper limit, the guiding effect on the magnetic induction lines is not increased any more. Further, as a result of test analysis, when the number of layers of the nanocrystal material included in the magnetic material layer 352 exceeds 5, the improvement of the guiding effect on the magnetic induction lines is not significantly increased, and therefore, in order to balance the hardware cost and the processing complexity, the number of layers of the nanocrystal material included in the magnetic material layer 352 may be selected to be 3, 4, or 5. I.e., the thickness of the magnetic material layer 352 is typically less than 0.2mm.

In order to make the technical solution of the present application more clearly understood, the following describes in detail the principle of the wireless charging device wirelessly charging the stylus pen 10 when the wireless charging device provided by the present application is the wireless keyboard 30.

Referring to fig. 13, which is a schematic diagram of an architecture of wireless charging according to an embodiment of the present disclosure.

The wireless keyboard specifically includes: the wireless charging system comprises a first battery 303, a first charging control module 302, a transmitting terminal wireless charging control module 301, a transmitting terminal coil 11, a magnetic material layer 352 and a charging interface 32.

The stylus pen includes: a receiving end coil 21, a receiving end wireless charging control module 101, a second charging control module 102 and a second battery 103.

The wireless keyboard is as the transmitting terminal of wireless signal that charges, and the handwriting pen is as the receiving terminal of wireless signal that charges, and wireless keyboard can carry out wireless charging to the handwriting pen.

The wireless keyboard comprises a charging component shown in fig. 9, and the charging component specifically comprises an inner layer support structure and an outer layer support structure. Wherein, the transmitting end coil 11 and the magnetic material layer 352 are disposed in the space formed by the inner layer support structure and the outer layer support structure, which will not be described in detail herein.

The transmitting wireless charging control module 301 may be a transmitting (Tx) chip, on which a Direct Current (DC)/Alternating Current (AC) converter, also called an inverter or an inverter circuit, is integrated, and is configured to convert a DC power provided by the first battery 303 or the power adapter 160 into an AC power and provide the AC power to the transmitting coil 11, so that the transmitting coil 11 generates an alternating magnetic field by using the AC power.

The receiving-end wireless charging control module 101 may be a receiving (Rx) chip on which an AC/DC converter, also called a rectifier or a rectifying circuit, is integrated. When the receiving-end coil 21 generates an alternating current with an alternating magnetic field, the AC/DC converter is used to rectify the alternating current into a direct current and charge the second battery 103 through the second charging control module 102.

In some embodiments, the first charging control module 302 and the second charging control module 102 may include a DC/DC conversion circuit, such as a boost (boost) circuit, a buck (buck) circuit, or a buck-boost (buck-boost) circuit, which is not limited in this embodiment.

In some embodiments, the wireless keyboard is turned off by default, and when the wireless keyboard detects that there is a dc input at the charging interface 32 and the stylus pen is located in the receiving cavity, the wireless charging function for the stylus pen is started.

In other embodiments, the function of wirelessly powering the stylus pen by the wireless keyboard is turned off by default, and the function of wirelessly powering the stylus pen is started when the wireless keyboard detects that the stylus pen is inserted into the receiving cavity.

After the function of the wireless keyboard for supplying power to the handwriting pen wirelessly is started, the transmitting end wireless charging control module 301 converts the direct current into alternating current, and transmits the alternating current to the transmitting end coil 11. The transmitting end coil 11 generates an alternating electromagnetic field in response to the alternating current.

The receiving end coil 21 of the stylus pen is coupled with the transmitting end coil 11, and after the receiving end coil 21 induces the alternating electromagnetic field, alternating current can be generated and input to the receiving end wireless charging control module 101. The receiving-end wireless charging control module 101 rectifies the alternating current into direct current, and transmits the direct current to the second charging control module 102. The second charging control module 102 may charge the second battery 103 using the direct current.

In practical applications, the transmitting-end wireless charging control module 301 and the receiving-end wireless charging control module 101 may further include matching circuits. The matching circuit may comprise a combination of capacitors.

Specifically, the matching circuit in the transmitting-end wireless charging control module 301 is configured to form LC resonance with the transmitting-end coil 11, so as to improve the transmitting efficiency of the transmitting-end coil 11. The matching circuit in the receiving-end wireless charging control module 101 is used to form LC resonance with the receiving-end coil 21, so as to improve the receiving efficiency of the receiving-end coil 21.

In addition, the wireless keyboard may also support wired charging. For example, the charging interface 32 of the wireless keyboard may be connected to a power supply through the power adapter 160, and the charging interface 32 may be any one of a Type-C interface, a Micro B interface, or a POGO pin interface, or may also be another interface capable of providing a direct current signal, which is not limited in this application.

It should be noted that fig. 13 only shows a schematic diagram of a possible charging circuit structure of the wireless keyboard and the electronic stylus. The charging circuit structure of the wireless keyboard and the electronic stylus pen in the embodiment of the present application includes, but is not limited to, the structure shown in fig. 13. For example, the functions of the first charging control module 302 and the transmitting-side wireless charging control module 301 shown in fig. 13 may be implemented by being integrated into one charging management module.

The following description is made in conjunction with the system architecture of a wireless keyboard.

Referring to fig. 14, it is a schematic system structure diagram of a wireless keyboard according to an embodiment of the present application.

The wireless keyboard may include a processor 36, a memory 39, a charging interface 32, a charging management module 310, a transmitting coil 11, a first battery 303, a wireless communication module 38, a touch pad 37, a keyboard 331, and the like.

The processor 36, the memory 39, the charging interface 32, the charging management module 310, the first battery 303, the touch pad 37, the wireless communication module 38, the keyboard 331, and the like may be disposed on a keyboard body (e.g., the keyboard body 33 shown in fig. 9) of the wireless keyboard. The transmitting-side coil 11 may be provided at a connecting portion for movably connecting the keyboard main body and the stand structure.

It is understood that the structure illustrated in the present embodiment does not constitute a specific limitation to the wireless keyboard. In other embodiments, the wireless keyboard may include more or fewer components than shown, or some components may be combined, or some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Memory 39 may be used, among other things, to store program code, such as program code for wirelessly charging a stylus. The memory 39 may also have stored therein a bluetooth address for uniquely identifying the wireless keyboard. In addition, the memory 39 may also store connection data with electronic devices that have been successfully paired before the wireless keyboard. For example, the connection data may be a bluetooth address of the electronic device that was successfully paired with the wireless keyboard. Based on the connection data, the wireless keyboard can be automatically paired with the electronic device without having to re-reconfigure the connection therebetween, such as re-performing legitimacy verification and the like. The bluetooth address may be a Media Access Control (MAC) address.

The processor 36 may be configured to execute the application program code and call the relevant modules to implement the functions of the wireless keyboard in the embodiment of the present application. For example, a wireless keyboard wired charging function, a function of wirelessly supplying power to a stylus pen, a wireless communication function, and the like are realized. The processor 36 may include one or more processing units, and the various processing units may be separate devices or may be integrated into one or more of the processors 36. The processor 36 may be embodied as an integrated control chip, or may be composed of a circuit including various active and/or passive components, and configured to perform the functions attributed to the processor 36 as described in the embodiments of the present application. Wherein the processor of the wireless keyboard may be a microprocessor.

The wireless communication module 38 may be used for supporting data exchange of wireless communication between the wireless keyboard and other electronic devices, including Bluetooth (BT), global Navigation Satellite System (GNSS), wireless Local Area Network (WLAN) (such as Wi-Fi network), frequency Modulation (FM), near Field Communication (NFC), infrared (IR), and the like.

In some embodiments, the wireless communication module 38 may be a bluetooth chip. The wireless keyboard may be a bluetooth keyboard. The wireless keyboard can be paired with Bluetooth chips of other electronic equipment through the Bluetooth chip and establish wireless connection, so that wireless communication between the wireless keyboard and other electronic equipment is realized through the wireless connection.

In addition, the wireless communication module 38 may further include an antenna, and the wireless communication module 38 receives electromagnetic waves via the antenna, frequency-modulates and filters signals of the electromagnetic waves, and transmits the processed signals to the processor 36. The wireless communication module 38 may also receive signals to be transmitted from the processor 36, frequency modulate them, amplify them, and convert them into electromagnetic waves via the antenna for radiation.

In some embodiments, the wireless keyboard may support wired charging. Specifically, the charging management module 310 may receive a charging input of the wired charger through the charging interface 32.

In other embodiments, the wireless keyboard may also support wireless charging by other components (e.g., a wireless charger) or devices (e.g., an electronic device such as a tablet computer).

The charging management module 310 may also supply power to the wireless keyboard while charging the first battery 303. The charge management module 310 receives an input of the first battery 303, and supplies power to the processor 36, the memory 39, the wireless communication module 38, and the like. The charging management module 310 may also be configured to monitor parameters such as battery capacity, battery cycle number, battery health (leakage, impedance) of the first battery 303, and send corresponding communication information to the connected electronic device through the wireless communication module 39, so as to inform the electronic device of the current battery parameter information. In other embodiments, the charge management module 310 may also be disposed in the processor 36.

When the wireless keyboard wirelessly supplies power to the stylus pen, the charging management module 310 may receive input from the charging interface 32 or the first battery 303, and convert direct current input from the charging interface 32 or the first battery 303 into alternating current. The alternating current is transmitted to the transmitting-side coil 11 through the matching circuit. The transmitting-side coil 11 generates an alternating electromagnetic field by using an alternating current, and the receiving-side coil induces the alternating electromagnetic field to generate an alternating current.

It should be noted that the matching circuit may be integrated in the charging management module 310, and the matching circuit may also be independent from the charging management module 310, which is not limited in this embodiment of the application. Fig. 14 illustrates an example in which the matching circuit is integrated in the charge management module 310.

In the case where the wireless keyboard shown in fig. 14 is applied to the wireless keyboard shown in fig. 13, the charging management module 310 shown in fig. 14 integrates the functions of the transmitting-side wireless charging control module 301 and the first charging control module 302 shown in fig. 13.

The touch panel 37 is integrated with a touch sensor. The processor 36 may receive control commands and input information via the touch pad 37 and the keyboard 331.

It is understood that the illustrated structure of the embodiments of the present application does not constitute a specific limitation to the wireless keyboard. It may have more or fewer components than shown in fig. 14, may combine two or more components, or may have a different configuration of components. For example, the external surface of the wireless keyboard may further include keys, indicator lights (which may indicate the status of power, incoming/outgoing calls, pairing mode, etc.), a display screen (which may prompt the user for relevant information), and the like. The key may be a physical key or a touch key (used in cooperation with a touch sensor), and is used for triggering operations such as power on, power off, charging start, charging stop, and the like.

The technical effect of the method is described in combination with the results of experimental tests.

Simulation was performed by taking as an example that the receiving-end coil 11 and the transmitting-end coil 21 were copper wires having a wire diameter of 0.22mm, the number of turns of the receiving-end coil 11 was 53, the size of the winding cross section of the receiving-end coil 11 (i.e., the cross section in fig. 10) was about 4mm × 2mm, the diameter of the winding cross section of the transmitting-end coil 21 was 10mm, and the relative permeability of the crushed nanocrystalline material used for the magnetic material layer was 1500, and the obtained simulation data were as shown in the following table.

Table 1: simulation test data sheet

As can be seen from table 1, under the condition that the number of turns of the transmitting end coil is the same, the coil inductance when the nanocrystalline coating is performed on the periphery of the transmitting end coil is larger than the coil inductance when the nanocrystalline coating is not performed.

For example, when the inductance parameter of the transmitting end coil needs to be 10.5 muh, and the nanocrystalline is coated on the periphery of the transmitting end coil, the number of turns of the transmitting end coil needs to be 30 turns, and the corresponding alternating-current impedance of the transmitting end coil is 0.76227 Ω; when no nanocrystalline coating exists on the periphery of the transmitting end coil, the number of turns of the transmitting end coil is 34 turns, and the corresponding alternating current impedance of the transmitting end coil is 0.80844 omega.

That is, when the inductance parameter of the transmitting end coil is fixed, the nanocrystalline is coated on the periphery of the transmitting end coil, so that the number of turns of the transmitting end coil can be reduced, and further the alternating current impedance of the transmitting end coil is reduced, and the charging efficiency is improved.

The simulation results of the coupling coefficient between the receiving-end coil 11 and the transmitting-end coil 21 are shown in the following table:

table 2: simulation result of coupling coefficient

As is apparent from the data in table 1, the coupling coefficient when the nanocrystal coating is performed on the periphery of the coil at the transmitting end is greater than the coupling coefficient when no nanocrystal coating is performed.

In practical applications, since the magnetic material layer 352 attached to the outer side of the transmitting-end coil 21 is thin, as described in the above embodiments, the thickness of the magnetic material layer 352 is generally less than 0.2mm, so the magnetic material layer 352 hardly occupies extra layout space, and is convenient for implementing a miniaturized design.

The magnetic material layer 352 may completely surround the outside of the transmitting end coil 21, or only surround a part of the transmitting end coil 21, and in practical applications, the magnetic material layer 352 completely surrounds the outside of the transmitting end coil 21 in order to maximize the coupling coefficient and efficiency.

In conclusion, according to the scheme provided by the application, when the stylus pen is located in the storage cavity, because the transmitting end coil is arranged around the storage cavity, the receiving end coil is located in the hollow position of the transmitting end coil, namely the receiving end coil is surrounded by the transmitting end coil, and compared with the scheme located on two sides of the contact surface, the coupling effect of the receiving end coil and the transmitting end coil is improved, so that the charging efficiency is improved, and the charging time is shortened. Furthermore, the magnetic material layer is coated on the outer side of the transmitting end coil, can be made of nanocrystalline materials with high magnetic conductivity, high saturation magnetic flux density and small magnetic loss, and can better guide a magnetic induction line to form a loop, so that the charging efficiency of the stylus pen is further improved, and the charging time length is further shortened. In addition, because the coupling coefficient promotes, consequently can reduce the number of turns of transmitting end coil, reduced the bulk impedance of transmitting end coil on the one hand, on the other hand still is favorable to dwindling the volume of transmitting end coil, the miniaturized design of being convenient for.

In the above embodiments, the case that the stylus pen is charged by the wireless keyboard is taken as an example, in other embodiments, the stylus pen may also be charged by the stylus pen accommodating device, and the following describes an implementation manner when the wireless charging device is the stylus pen accommodating device.

Referring to fig. 15, a schematic diagram of a stylus holding apparatus according to an embodiment of the present disclosure is shown.

The stylus holding device 50 includes a receiving cavity 51 and a charging interface 52.

The stylus holding device 50 shown in fig. 15 is only one possible implementation, and in practical applications, the stylus holding device 50 may also be configured in other forms, for example, a vertical placement mode is designed, and the stylus 10 is inserted into the receiving cavity 51.

The transmitting end coil is wound around the cavity wall of the accommodating cavity 51, and the cavity wall plays a role of a support structure at this time. The embodiment of the present application does not specifically limit the winding direction of the coil of the transmitting end coil, the winding shape of the cross section, the diameter of the wire of the wound coil, the material of the wire of the wound coil, the number of layers of the coil, and the number of strands of the coil.

The magnetic material layer is positioned outside the transmitting end coil. For a detailed implementation and principle, reference may be made to fig. 10, fig. 12A and fig. 12B, which are not described herein again.

For the structural description of the stylus accommodating apparatus 50 and the stylus 10, reference may be made to the corresponding description of fig. 13 and 14, which will not be described herein again.

Utilize the scheme that this application provided, when the stylus pen is located the stylus pen and holds equipment and accomodate the intracavity, because the transmitting terminal coil sets up around accomodating the chamber, consequently make the receiving terminal coil be in the hollow position of transmitting terminal coil, also the receiving terminal coil is surrounded by the transmitting terminal coil, compare in lieing in contact surface both sides scheme for the coupling effect of receiving terminal coil and transmitting terminal coil promotes, and then has promoted charge efficiency, has shortened the charge time. Furthermore, the magnetic material layer is coated on the outer side of the transmitting end coil, can be made of nanocrystalline materials with high magnetic conductivity, high saturation magnetic flux density and small magnetic loss, and can better guide a magnetic induction line to form a loop, so that the charging efficiency of the stylus pen is further improved, and the charging time length is further shortened. In addition, because the coupling coefficient promotes, consequently can reduce the number of turns of transmitting end coil, reduced the bulk impedance of transmitting end coil on the one hand, on the other hand still is favorable to dwindling the volume of transmitting end coil, the miniaturized design of being convenient for.

In still other embodiments, the wireless charging device may be directly used for charging the electronic device, i.e. the stylus pen, as described in detail below.

Referring to fig. 16, the figure is a schematic view of an electronic device provided in an embodiment of the present application.

The electronic device may be a mobile phone, a notebook computer, a tablet computer, or an intelligent screen, and the like, which is not specifically limited in this application embodiment. The electronic device 20 is illustrated as a tablet computer.

At this time, the electronic device 20 includes a receiving cavity 201 thereon for wirelessly charging the stylus.

The coil at the transmitting end of the electronic device 20 is wound around the cavity wall of the accommodating cavity 51, and the cavity wall plays a role of a support structure. The embodiment of the application does not specifically limit the winding direction of the coil of the transmitting end coil, the winding shape of the cross section, the diameter of the wire for winding the coil, the material of the wire for winding the coil, the number of layers of the coil and the number of strands of the coil.

The magnetic material layer is positioned outside the transmitting end coil. For a detailed implementation manner and principle, reference may be made to fig. 10, fig. 12A, and fig. 12B, which are not described herein again.

For the structural description of the electronic device 20 and the stylus 10, reference may be made to the corresponding description in fig. 13 and fig. 14, and details are not repeated here. Utilize the scheme that this application provided, when the handwriting pen was located electronic equipment's the intracavity of accomodating, because the transmitting terminal coil sets up around accomodating the chamber, consequently make the receiving terminal coil be in the hollow position of transmitting terminal coil, also the receiving terminal coil is surrounded by the transmitting terminal coil, compare in being located contact surface both sides scheme for the coupling effect of receiving terminal coil and transmitting terminal coil promotes, and then has promoted charge efficiency, has shortened the charge time. Furthermore, the magnetic material layer is coated on the outer side of the transmitting end coil, can be made of nanocrystalline materials with high magnetic conductivity, high saturation magnetic flux density and small magnetic loss, and can better guide a magnetic induction line to form a loop, so that the charging efficiency of the stylus pen is further improved, and the charging time length is further shortened. In addition, because the coupling coefficient promotes, consequently can reduce the number of turns of transmitting end coil, reduced the bulk impedance of transmitting end coil on the one hand, on the other hand still is favorable to dwindling the volume of transmitting end coil, the miniaturized design of being convenient for.

Based on the wireless charging device provided by the above embodiment, the embodiment of the present application further provides a wireless charging system, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 17, this figure is a schematic diagram of a wireless charging system according to an embodiment of the present application.

The wireless charging system 170 includes a wireless charging device 171 and a pen 10.

The stylus pen 10 comprises a receiving end coil, and when the stylus pen 10 is located in a containing cavity of the wireless charging device, at least a part of the receiving end coil is located in a hollow area formed by winding of a transmitting end coil.

The wireless charging device 171 may be a wireless keyboard shown in fig. 9, or a stylus pen accommodating device shown in fig. 15, or an electronic device such as a tablet pc shown in fig. 16, which is not particularly limited in this embodiment of the present invention.

For a specific implementation manner and an operation principle of the wireless charging device 171, reference may be made to the description in the above embodiments, and details of the embodiments of the present application are not repeated.

The application provides a wireless charging system compares in traditional scheme for the coupling effect of receiving end coil and transmitting end coil promotes, and then has promoted charge efficiency, has shortened the charge time. Furthermore, the magnetic material layer is coated on the outer side of the transmitting end coil, can be made of nanocrystalline materials with high magnetic conductivity, high saturation magnetic flux density and small magnetic loss, and can better guide a magnetic induction line to form a loop, so that the charging efficiency of the stylus pen is further improved, and the charging time length is further shortened. In addition, because the coupling coefficient promotes, consequently can reduce the number of turns of transmitting end coil, reduced the bulk impedance of transmitting end coil on the one hand, on the other hand still is favorable to dwindling the volume of transmitting end coil, the miniaturized design of being convenient for.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A wireless charging device, the wireless charging device comprising: the antenna comprises an inner layer bracket structure, an outer layer bracket structure, a transmitting end coil and a magnetic material layer;

the inner layer support structure surrounds to form a containing cavity, and the containing cavity is used for containing a handwriting pen;

the transmitting end coil and the magnetic material layer are arranged in a cavity formed by the inner layer support structure and the outer layer support structure;

the transmitting end coil is wound around the inner layer support structure, so that when the stylus pen is positioned in the accommodating cavity, at least part of a receiving end coil of the stylus pen is positioned in a hollow area formed by winding the transmitting end coil;

the magnetic material layer surrounds the outside of the transmitting end coil.

2. The wireless charging apparatus of claim 1, wherein the magnetic material layer is a soft magnetic material layer.

3. The wireless charging device according to claim 1 or 2, wherein the material in the magnetic material layer is composed of one or more of a nanocrystalline material, an amorphous material, silicon steel, or ferrite.

4. The wireless charging device of claim 1, wherein the magnetic material layer comprises a plurality of layers of nanocrystalline materials, and the plurality of layers of nanocrystalline materials are adhered together by glue.

5. The wireless charging device of claim 1, wherein the thickness of the magnetic material layer is less than 0.2 millimeters.

6. The wireless charging apparatus of claim 4, wherein each of the plurality of layers of nanocrystalline materials is subjected to a fragmentation process to stabilize the relative permeability of each layer of nanocrystalline material.

7. The wireless charging apparatus of claim 6, wherein the relative permeability of each layer of the nanocrystalline material is between 1000 and 3000.

8. The wireless charging device of claim 1, wherein the magnetic material layer is adhered to an outer side of the transmitting end coil.

9. The wireless charging device of claim 1, wherein the magnetic material layer is affixed to the outer support structure.

10. The wireless charging apparatus of claim 1, further comprising: the wireless charging control system comprises a charging interface, a first charging control module, a first battery and a transmitting terminal wireless charging control module;

the charging interface is used for connecting a power adapter or a power supply;

the first end of the first charging control module is connected with the charging interface, and the second end of the first charging control module is connected with the first battery;

the first end of the transmitting end wireless charging control module is connected with the first end of the first charging control module, and the second end of the transmitting end wireless charging control module is connected with the transmitting end coil;

the first charging control module is used for charging the first battery by using the direct current input by the charging interface or providing the direct current for the transmitting terminal wireless charging control module;

the transmitting terminal wireless charging control module is used for converting the acquired direct current into alternating current and transmitting the alternating current to the transmitting terminal coil so as to enable the transmitting terminal coil to generate an alternating electromagnetic field.

11. The wireless charging apparatus of claim 10, wherein the wireless charging apparatus is a wireless keyboard, a stylus-holding device, or a tablet computer.

12. The wireless charging device of claim 10 or 11, wherein the charging interface is any one of a Type-C interface, a Micro B interface, or a POGO pin interface.

13. A wireless charging system, comprising a stylus and the wireless charging apparatus of any one of claims 1-12;

the stylus pen includes a receiving end coil;

when the stylus pen is located in the containing cavity of the wireless charging device, at least part of the receiving end coil is located in a hollow area formed by winding the transmitting end coil.