Wireless charging module and electronic device

Abstract

The application discloses a wireless charging module and electronic equipment, the wireless charging module comprises a shielding element and a charging coil arranged on the shielding element; the shielding element is provided with a first through slot, the first through slot extends to the edge of the shielding element, and at least completely covers the charging coil in the radial direction of the charging coil. By forming the first through slot on the shielding element, the eddy current is blocked by the first through slot, and the eddy current in opposite rotating directions is formed on the two sides of the first through slot. Overall, the direction of the eddy current on the surface of the shielding element is disturbed, so that the eddy current is partially offset, thereby achieving the purpose of reducing the eddy current loss. Since the first through slot does not cut the shielding element into multiple independent parts, the shielding performance of the integral structure of the shielding element can be maintained.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, specifically to a wireless charging module and electronic device. Background Technology

[0002] Materials that can respond to a magnetic field are collectively called magnetic materials. Among them, materials that maintain constant magnetism once magnetized are called hard magnetic materials, while materials that can achieve the maximum magnetization intensity with the minimum external magnetic field are called soft magnetic materials. Soft magnetic materials have low coercivity and high permeability, are easy to magnetize and demagnetize, and are widely used in electrical and electronic equipment, such as wireless charging products.

[0003] Current wireless charging products mainly suffer from the problem of significant heat generation, which reduces charging efficiency. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a wireless charging module and electronic device that can improve the existing wireless charging modules, which mainly suffer from significant heat generation and reduced charging efficiency.

[0005] To solve the above-mentioned technical problems, in a first aspect, embodiments of this application provide a wireless charging module, including a shielding component and a charging coil disposed on the shielding component;

[0006] The shielding member is provided with a first through slot that extends to the edge of the shielding member and at least completely covers the charging coil in the radial direction.

[0007] Optionally, the first through groove can be straight, smooth curved, or serrated.

[0008] Optionally, multiple first through slots may be provided.

[0009] Optionally, multiple first through slots are evenly distributed along the circumference of the charging coil.

[0010] Optionally, the first through groove is a smooth curve, and all the first through grooves are bent in a clockwise direction or in a counterclockwise direction.

[0011] Optionally, the shielding component is an amorphous soft magnetic alloy shielding component, a nanocrystalline soft magnetic alloy shielding component, or a soft magnetic ferrite shielding component.

[0012] Optionally, the shielding member is further provided with a second through slot, which is located at one end of the first through slot near the center of the charging coil.

[0013] Optionally, the first through slot is connected to the middle of the second through slot, and the second through slot is perpendicular to the first through slot.

[0014] Secondly, this application also provides an electronic device, including the wireless charging module described in the above embodiments.

[0015] Optionally, the electronic device is a mobile phone, tablet, watch, earphones, or wireless charging dock.

[0016] As described above, the wireless charging module of this application includes a shielding component and a charging coil. The charging coil is disposed on the shielding component, which has a first through-slot extending to the edge of the shielding component and at least completely covering the charging coil along its radial direction. During operation, the shielding component is situated within the alternating magnetic field generated by the charging coil, providing a low-impedance path for the magnetic flux to reduce magnetic field divergence and its impact on the surrounding environment of the charging coil, thus achieving magnetic shielding. After the first through-slot is formed on the shielding component, eddy currents are blocked by the first through-slot, and eddy currents with opposite rotation directions are formed on both sides of the first through-slot. Overall, the direction of the eddy currents on the surface of the shielding component is disturbed, which can partially cancel out the eddy currents, thereby reducing eddy current losses. At the same time, since the first through-slot does not cut the shielding component into multiple independent parts, the shielding performance of the integrated structure of the shielding component can be maintained. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] Figure 1 This is a structural diagram of a wireless charging module based on related technologies;

[0019] Figure 2 yes Figure 1 Simulation diagram of eddy currents generated on the shielding component when the wireless charging module is working;

[0020] Figure 3 This is a schematic diagram of the structure of a wireless charging module provided in an embodiment of this application;

[0021] Figure 4 yes Figure 3 Simulation diagram of eddy currents generated on the shielding component when the wireless charging module is working;

[0022] Figure 5 These are schematic diagrams of the structures of some wireless charging modules provided in the embodiments of this application;

[0023] Figure 6These are schematic diagrams of other wireless charging modules provided in the embodiments of this application;

[0024] Figure 7 This is a simulation diagram of the eddy currents generated on the shielding component of another wireless charging module provided in this application embodiment during operation, wherein the shielding component has one first through slot and one second through slot;

[0025] Figure 8 This is a schematic diagram of another wireless charging module provided in the embodiments of this application.

[0026] The realization of the objectives, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0028] Please see Figure 1 , Figure 1 This is a schematic diagram of a wireless charging module based on related technology. The wireless charging module mainly includes a shielding component 10a and a charging coil 20a disposed on the shielding component 10a. This wireless charging module exhibits significant heat generation during operation, which reduces charging efficiency.

[0029] The applicant analyzed the situation and found that the shielding component 10a is generally made of soft magnetic material. The losses of soft magnetic material mainly include hysteresis loss, eddy current loss, and residual loss. Hysteresis loss is the energy consumed by the magnet due to hysteresis during repeated magnetization, and it is proportional to the area of ​​the hysteresis loop. Eddy current loss refers to the energy loss in the form of Joule heating generated when the soft magnetic material is AC magnetized. Residual loss refers to the remaining portion after deducting hysteresis loss and eddy current loss.

[0030] Please see Figure 2 , Figure 2 yes Figure 1 A simulation diagram of eddy currents generated on the shielding component of a wireless charging module during operation. Figure 2As can be seen, the eddy currents are stronger in the area close to the coil and relatively weaker in the area farther from the coil (where red represents relatively strong eddy currents and blue represents relatively weak eddy currents; since the image has been black and white, the line colors cannot be distinguished). All eddy currents are in the same direction (clockwise). The eddy currents are confined inside the shield 10a and cannot be emitted outwards; they are ultimately absorbed by the material and converted into heat energy, which is then lost. Based on this, this application provides a wireless charging module and a wireless charging device.

[0031] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a wireless charging module provided in an embodiment of this application. The wireless charging module may include a shielding member 10 and a charging coil 20.

[0032] The shielding component 10 primarily serves as magnetic shielding to reduce the impact of the charging coil 20 on the surrounding environment. As examples, the shielding component 10 can be an amorphous soft magnetic alloy shielding component, a nanocrystalline soft magnetic alloy shielding component, or a soft magnetic ferrite shielding component. Amorphous soft magnetic alloys, or simply amorphous, are solid alloys with long-range disorder and no grains; nanocrystalline soft magnetic alloys, or simply nanocrystalline, consist of crystalline phases of tens of nanometers and amorphous grain boundary phases; soft magnetic ferrites are non-metallic ferrimagnetic soft magnetic materials, including manganese-zinc, nickel-zinc, and other systems. The soft magnetic materials in the wireless charging module need to possess high saturation magnetic induction, high permeability, and low loss characteristics to achieve miniaturization of the wireless charging system, magnetic shielding, reduced heat dissipation, and improved transmission efficiency. The shielding component 10 can be rectangular, polygonal, circular, etc., and this application does not impose any particular limitation.

[0033] The charging coil 20 is disposed on the shield 10. As an example, the charging coil 20 can be a coil in the form of a copper wire-wound coil and / or an FPC coil, etc., and the charging coil 20 can be attached to the surface of the shield 10 with double-sided adhesive. The center of the charging coil is preferably coaxial with the center of the shield 10.

[0034] The shield 10 is provided with a first through groove 11, which extends to the edge of the shield 10 and at least completely covers the charging coil 20 in the radial direction. In other words, one end of the shield 10 extends toward the center of the shield 10, at least beyond the inner edge of the charging coil 20, and the other end extends to the edge of the shield 10.

[0035] It should be noted that in this application, "through groove" refers to a groove that extends through the shielding member 10 along its thickness direction. For example, a portion of the shielding member 10 can be removed by die-cutting or laser cutting to form the first through groove 11. The remaining unremoved area of ​​the shielding member 10 remains a single unit. Preferably, the width of the first through groove 11 can be 0.5-5mm, such as 1mm, 1.5mm, 2mm, 3mm, etc. Too small a width increases processing difficulty, while too large a width reduces the shielding effect of the shielding member 10.

[0036] In this embodiment of the wireless charging module, during operation, the shield 10 is situated within the alternating magnetic field generated by the charging coil 20, providing a low-impedance path for the magnetic flux to reduce magnetic field divergence and its impact on the surrounding environment of the charging coil 20, thus achieving magnetic shielding. After the first through-slot 11 is formed on the shield 10, eddy currents are blocked by the first through-slot 11, such as... Figure 4 In the central region A, eddies with opposite rotation directions are formed on both sides of the first through groove 11. Overall, the direction of the eddies on the surface of the shield 10 is disturbed, which can partially cancel out the eddies, thereby reducing eddy current loss. At the same time, since the first through groove 11 does not cut the shield 10 into multiple independent parts, the shielding performance of the integrated structure of the shield 10 can be maintained.

[0037] In one embodiment, multiple first through slots 11 may be provided. See also... Figure 5 , Figure 5 This is a schematic diagram of the structure of some wireless charging modules provided in the embodiments of this application. The shielding member 10 is provided with four first through slots 11. As some examples, the first through slots 11 can be straight, such as... Figure 5 As shown in (a); the first through groove 11 can also be a smooth curve, such as... Figure 5 As shown in (b); the first through groove 11 can also be serrated, such as... Figure 5 As shown in (c).

[0038] Preferably, the multiple first through slots 11 are evenly distributed along the circumference of the charging coil 20, thereby enabling the charging coil 20 to form a more uniform magnetic field. In addition, when the first through slots 11 are smooth curves, it is preferable that all the first through slots 11 bend in a clockwise direction or in a counterclockwise direction, that is, all the first through slots 11 bend in the same direction, which can further improve the uniformity of the magnetic field.

[0039] It should be noted that after the first through slot 11 is opened on the shielding component 10, the first through slot 11 will be located at one end of the inner side of the shielding component 10, such as... Figure 4 In region B, the current density is increased (red cannot be displayed due to black-and-white processing), which will increase losses in that area. Therefore, in one embodiment, please refer to... Figure 6 , Figure 6 These are schematic diagrams of other wireless charging modules provided in the embodiments of this application, wherein (a), (b), and (c) are respectively related to... Figure 5 (a), (b), and (c) correspond to each other. The shielding member 10 may also be provided with a second through slot 12, which is located at one end of the first through slot 11 near the center of the charging coil 20.

[0040] In this embodiment, by adding a second through slot 12, the current direction in a portion of the high-current density region (i.e., region B) can be rotated 90° upwards, while the current direction in another portion is obliquely downwards. That is, at the connection between the first through slot 11 and the second through slot 12, some current cancels out, thereby further reducing eddy current losses. For example, the width of the first through slot 11 and the width of the second through slot 12 can be equal, and the length of the second through slot 12 can be 2.5 to 5 times its width, preferably 3 times.

[0041] It should be noted that the connection position and angle between the second through groove 12 and the first through groove 11 are not particularly limited in this embodiment. For example, they can be connected in an "L" shape, and the connection angle can be greater than 0 and less than 180°. As an example, the first through groove 11 is connected to the middle of the second through groove 12, for example, the first through groove 11 is connected to the midpoint of the second through groove 12, and the second through groove 12 is preferably perpendicular to the first through groove 11. Figure 6 As shown, this can uniformly reduce the eddy current effect on both sides of the end of the first through-slot 11, such as... Figure 7 As shown.

[0042] This application also provides an electronic device that may include the wireless charging module described in the above embodiments. For example, the electronic device may be a mobile phone, tablet, watch, earphones, or a wireless charging dock, or other consumer electronics.

[0043] For the working principles and processes of the electronic devices, please refer to the description of the wireless charging module in the foregoing embodiments of the present invention, which will not be repeated here.

[0044] The present application will be further described below with reference to specific embodiments.

[0045] Comparative Example

[0046] The shielding component is not slotted.

[0047] Example 1

[0048] Compared to the comparative example, the only difference is that four straight first through slots 11 are opened on the shielding component 10.

[0049] Example 2

[0050] Compared to Embodiment 1, the shape of the first through groove 11 is changed to a smooth arc.

[0051] Example 3

[0052] Compared to Embodiment 1, the shape of the first through groove 11 is changed to a sawtooth shape.

[0053] Example 4

[0054] Compared to Embodiment 1, the only difference is the addition of a second through groove 12, and the second through groove 12 is perpendicular to the first through groove 11.

[0055] Example 5

[0056] Compared to Embodiment 2, the only difference is the addition of a second through groove 12, and the second through groove 12 is perpendicular to the first through groove 11.

[0057] Example 6

[0058] Compared to embodiment 3, the only difference is the addition of a second through groove 12, and the second through groove 12 is not perpendicular to the first through groove 11. The specific structure is as follows: Figure 8 As shown.

[0059] Example 7

[0060] Compared to embodiment 3, the only difference is the addition of a second through groove 12, and the second through groove 12 is perpendicular to the first through groove 11.

[0061] Among them, Examples 1-3 correspond to Figure 5 In (a), (b), and (c), Examples 4-6 correspond to respectively Figure 6 (a), (b), (c).

[0062] Table 1 Performance test data of wireless charging modules in various embodiments

[0063]

[0064] The experimental results are shown in Table 1. It can be seen that, compared to the comparative examples, embodiments 1-6 of this application can all improve the eddy current loss problem and reduce the resistance of the wireless charging module. Furthermore, adding a second through-slot 12 on top of the first through-slot 11 can further reduce eddy current loss. Among these, embodiment 7, with its sawtooth-shaped first through-slot 11 and vertical second through-slot 12, shows the best effect. However, compared to embodiment 4, with its straight first through-slot 11 and vertical second through-slot 12, controlling the vertical angle of the second through-slot 12 is more difficult.

[0065] It should be noted that the simulation condition parameters in each embodiment of this application can be referred to as follows:

[0066] The coil has a diameter of 42mm, and the shield is a 50*50mm square.

[0067] The first through groove 11 has a length of 16.5 mm and a width of 2 mm;

[0068] The second through groove 12 has a length of 5mm and a width of 2mm.

[0069] The sawtooth angle is 135°.

[0070] The foregoing has provided a detailed description of a wireless charging module and electronic device provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. It should be noted that the descriptions of each embodiment in this application have different focuses; parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments.

[0071] It should be understood that the terms "comprising" or "including" indicate the presence of the stated features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms "or," "and / or," and "comprising at least one of the following," as used in this application, can be interpreted as inclusive, or mean any one or any combination thereof. For example, "comprising at least one of the following: A, B, C" means "any one of the following: A; B; C; A and B; A and C; B and C; A and B and C," and similarly, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A and B and C." Exceptions to this definition only occur when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0072] It should be understood that although the terms first, second, third, etc., may be used in this document to describe various types of information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this document, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the singular forms “a,” “an,” and “the” used in this document are intended to also include the plural forms, unless the context indicates otherwise.

[0073] It should be understood that the terms "top", "bottom", "upper", "lower", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application.

[0074] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. The technical features of the technical solution of this application can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are also included within the patent protection scope of this application, as long as the combination of these technical features does not contradict each other.

Claims

1. A wireless charging module, characterized in that, Includes a shielding component and a charging coil disposed on the shielding component; The shielding member is provided with a first through slot and a second through slot. The first through slot extends to the edge of the shielding member and at least completely covers the charging coil in the radial direction of the charging coil. The second through slot is disposed at one end of the first through slot near the center of the charging coil, and the length of the second through slot is 2.5 to 5 times the width of the second through slot. The first through groove is serrated; The first through slot is connected to the middle of the long side of the second through slot, and the second through slot is perpendicular to the first through slot.

2. The wireless charging module according to claim 1, characterized in that, The first through slot has multiple slots.

3. The wireless charging module according to claim 2, characterized in that, Multiple first through slots are evenly distributed along the circumference of the charging coil.

4. The wireless charging module according to claim 1, characterized in that, The shielding component is an amorphous soft magnetic alloy shielding component, a nanocrystalline soft magnetic alloy shielding component, or a soft magnetic ferrite shielding component.

5. An electronic device, characterized in that, Includes the wireless charging module as described in any one of claims 1-4.

6. The electronic device according to claim 5, characterized in that, The electronic device is a mobile phone, tablet, watch, earphone, or wireless charging dock.

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