Wireless charging module and electronic equipment

Abstract

The invention discloses a wireless charging module and electronic equipment. The wireless charging module comprises a shielding piece and a charging coil arranged on the shielding piece; the charging coil comprises a shielding piece, the shielding piece is provided with a first through groove, the first through groove extends to the edge of the shielding piece and at least completely covers the charging coil in the radial direction of the charging coil, and the width of the first through groove is 0.5-5 mm. The first through groove is formed in the shielding piece, the eddy current is blocked by the first through groove, and the eddy currents with opposite rotation directions are formed on the two sides of the first through groove respectively, so that the direction of the eddy current on the surface of the shielding piece is disturbed as a whole, the eddy current part can be offset, and the purpose of reducing eddy current loss can be achieved; and meanwhile, the shielding piece is not cut into a plurality of independent parts by the first through grooves, so that the shielding performance of the integrated structure of the shielding piece can be maintained.

Description

Technical Field

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

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

[0003] Currently, the main problem of existing wireless charging products is that they generate obvious heat, which reduces the charging efficiency. Summary of the Invention

[0004] In view of the above technical problems, this application provides a wireless charging module and an electronic device, which can improve the problem that the existing wireless charging module mainly generates obvious heat and reduces the charging efficiency.

[0005] To solve the above technical problems, in a first aspect, an embodiment of this application provides a wireless charging module, including a shielding member and a charging coil disposed on the shielding member;

[0006] The shielding member is provided with a first through groove, the first through groove extends to the edge of the shielding member, and at least completely covers the charging coil along the radial direction of the charging coil, and the width of the first through groove is 0.5 - 5 mm.

[0007] Optionally, the first through groove is linear, a smooth curve or serrated, and the charging coil is adhered to the surface of the shielding member.

[0008] Optionally, there are multiple first through grooves.

[0009] Optionally, multiple first through grooves are evenly distributed along the circumferential direction of the charging coil.

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

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

[0012] Optionally, the shielding member is further provided with a second through groove, and the second through groove is disposed at one end of the first through groove close to 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] In a second aspect, the present application further provides an electronic device, including the wireless charging module described in each of the above embodiments.

[0015] Optionally, the electronic device is a mobile phone, a tablet, a watch, an earphone or a wireless charging stand

[0016] As described above, the wireless charging module of the present application includes a shielding member and a charging coil. The charging coil is disposed on the shielding member. The shielding member is provided with a first through slot. The width of the first through slot is 0.5 - 5 mm. The first through slot extends to the edge of the shielding member and at least completely covers the charging coil along the radial direction of the charging coil. During operation, the shielding member is in the alternating magnetic field formed by the charging coil, providing a low-impedance path for the magnetic flux to reduce the divergence of magnetic force lines and the influence on the surrounding environment of the charging coil, playing a role of magnetic shielding. After the first through slot is formed on the shielding member, the eddy current is blocked by the first through slot, and eddy currents with opposite rotation directions are respectively formed on both sides of the first through slot. Overall, the direction of the eddy current on the surface of the shielding member is disturbed, so that the eddy currents can partially cancel each other, thereby achieving the purpose of reducing eddy current loss. At the same time, since the first through slot does not cut the shielding member into multiple independent parts, the shielding performance of the integral structure of the shielding member can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of a wireless charging module in the related art;

[0019] Figure 2 is Figure 1 a simulation diagram of the eddy current generated on the shielding member when the wireless charging module is working;

[0020] Figure 3 is a schematic structural diagram of a wireless charging module provided by an embodiment of the present application;

[0021] Figure 4 is Figure 3 a simulation diagram of the eddy current generated on the shielding member when the wireless charging module is working;

[0022] Figure 5 FIG. 0 is a schematic structural diagram of some wireless charging modules provided by an embodiment of the present application;

[0023] Figure 6 FIG. 1 is a schematic structural diagram of some other wireless charging modules provided by an embodiment of the present application;

[0024] Figure 7 FIG. 2 is a simulation diagram of eddy currents generated on a shielding member when another wireless charging module provided by an embodiment of the present application is working, wherein one first through groove and one second through groove are respectively arranged on the shielding member;

[0025] Figure 8 FIG. 3 is a schematic structural diagram of yet another wireless charging module provided by an embodiment of the present application.

[0026] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Through the above-mentioned accompanying drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0027] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0028] Please refer to Figure 1 , Figure 1 FIG. 4 is a schematic structural diagram of a wireless charging module in the related art. The wireless charging module mainly includes a shielding member 10a and a charging coil 20a disposed on the shielding member 10a. When the wireless charging module is working, there is an obvious heat generation problem, which will further reduce the charging efficiency.

[0029] The applicant analyzed this. The shielding member 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 the hysteresis loss is proportional to the area of the hysteresis loop; Eddy current loss refers to the eddy current generated in the soft magnetic material during AC magnetization and forms energy loss in the form of Joule heat; Residual loss is the remaining part after removing hysteresis loss and eddy current loss.

[0030] Please refer to Figure 2 , Figure 2 isFigure 1 Simulation diagram of eddy current generated on the shielding part when the wireless charging module works. As can be seen from Figure 2 it, in the area close to the coil, the eddy current is stronger, and in the area far from the coil, the eddy current is relatively weaker (wherein, red represents relatively stronger eddy current, and blue represents relatively weaker eddy current. Since the picture has been processed in black and white, the line colors cannot be distinguished). All the eddy currents are in the same direction (clockwise direction). The eddy current closes inside the shielding part 10a and cannot be output outward. Eventually, it is absorbed by the material and converted into heat energy and dissipated. Based on this, the present application provides a wireless charging module and a wireless charging device.

[0031] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of a wireless charging module provided by an embodiment of the present application. The wireless charging module may include a shielding part 10 and a charging coil 20.

[0032] The shielding part 10 mainly plays a role of magnetic shielding and is used to reduce the influence of the charging coil 20 on the surrounding environment. As some examples, the shielding part 10 may be an amorphous soft magnetic alloy shielding part, a nanocrystalline soft magnetic alloy shielding part, or a soft ferrite shielding part, etc. Among them, amorphous soft magnetic alloy, abbreviated as amorphous, is a solid alloy with long-range disorder and no grain alloy; nanocrystalline soft magnetic alloy, abbreviated as nanocrystalline, is composed of crystalline phases of dozens of nanometers and amorphous grain boundary phases; soft ferrite is a non-metallic ferromagnetic soft magnetic material, including manganese-zinc, nickel-zinc and other systems. The soft magnetic material in the wireless charging module needs to have the characteristics of high saturation magnetic induction intensity, high magnetic permeability and low loss, so as to achieve the purposes of miniaturization of the wireless charging system, magnetic shielding and reduction of heat dissipation to improve the transmission efficiency. The shielding part 10 may be rectangular, polygonal, circular, etc., and the embodiments of the present application do not make special limitations.

[0033] The charging coil 20 is arranged on the shielding part 10. As an example, the charging coil 20 may be a coil in the form of a copper winding coil and / or an FPC coil, etc. The charging coil 20 can be attached to the surface of the shielding part 10 through double-sided tape. When both the charging coil 20 and the shielding part 10 are regular shapes (such as the charging coil 20 is circular and the shielding part 10 is rectangular), the center of the charging coil 20 is preferably coaxially arranged with the center of the shielding part 10.

[0034] The shielding part 10 is provided with a first through groove 11. The first through groove 11 extends to the edge of the shielding part 10 and at least completely covers the charging coil 20 along the radial direction of the charging coil 20. In other words, one end of the shielding part 10 extends towards the center of the shielding part 10 and at least exceeds the inner edge of the charging coil 20, and the other end extends to the edge of the shielding part 10.

[0035] It should be noted that in this application, the meaning of "through slot" refers to a slot that penetrates the shielding member 10 along the thickness direction of the shielding member 10. Exemplarily, a part of the shielding member 10 can be cut off by die-cutting or laser cutting to form a first through slot 11. The other uncut areas of the shielding member 10 remain an integral whole. Preferably, the width of the first through slot 11 can be 0.5 - 5 mm, such as 1 mm, 1.5 mm, 2 mm, 3 mm, etc. If it is too small, the processing difficulty increases, and if it is too large, the shielding effect of the shielding member 10 decreases.

[0036] In the wireless charging module of this embodiment, during operation, the shielding member 10 is in the alternating magnetic field formed by the charging coil 20, providing a low-impedance path for the magnetic flux to reduce the divergence of magnetic lines of force and the influence on the surrounding environment of the charging coil 20, playing a role of magnetic shielding. After the first through slot 11 is formed on the shielding member 10, the eddy current is blocked by the first through slot 11, such as Figure 4 in region A, and eddy currents with opposite rotation directions are formed on both sides of the first through slot 11. Overall, the direction of the eddy current on the surface of the shielding member 10 is disrupted, which can make the eddy currents partially cancel each other, so as to achieve the purpose of reducing eddy current loss. At the same time, since the first through slot 11 does not cut the shielding member 10 into multiple independent parts, the shielding performance of the integral structure of the shielding member 10 can be maintained.

[0037] In one embodiment, multiple first through slots 11 can be provided. Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of some wireless charging modules provided by the embodiments of this application. Four first through slots 11 are provided on the shielding member 10. As some examples, the first through slot 11 can be linear, as shown in Figure 5 (a); the first through slot 11 can also be a smooth curve, as shown in Figure 5 (b); the first through slot 11 can also be serrated, as shown in Figure 5 (c).

[0038] Preferably, multiple first through slots 11 are evenly distributed along the circumferential direction of the charging coil 20, so as to make the charging coil 20 form a more uniform magnetic field. In addition, when the first through slot 11 is a smooth curve, it is preferred that all the first through slots 11 bend in the clockwise direction or in the counterclockwise direction, that is, the bending directions of all the first through slots 11 are the same, which can also 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 member 10, the current density at one end of the first through slot 11 located inside the shielding member 10, such as Figure 4 in region B, increases (since it has been processed with black and white and the red color cannot be shown), which will increase the loss at this place. Therefore, in one embodiment, please refer toFigure 6 , Figure 6 is a schematic structural diagram of some other wireless charging modules provided by the embodiments of the present application, where (a), (b), and (c) respectively correspond to Figure 5 in (a), (b), and (c). The shielding member 10 may further be provided with a second through groove 12, and the second through groove 12 is provided at one end of the first through groove 11 close to the center of the charging coil 20.

[0040] In this embodiment, by adding the second through groove 12, part of the current direction in the high current density region (i.e., region B) can be rotated 90° upward, and the other part of the current direction is obliquely downward. That is, at the connection of the first through groove 11 and the second through groove 12, part of the current is cancelled, thereby further reducing the eddy current loss. Exemplarily, the width of the first through groove 11 and the width of the second through groove 12 may be equal, and the length of the second through groove 12 may be 2.5 to 5 times the width of the second through groove 12, preferably 3 times.

[0041] It should be noted that the present application embodiments do not particularly limit the connection position and connection angle between the second through groove 12 and the first through groove 11. For example, the two 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, as Figure 6 shown. It can uniformly weaken the eddy current influence on both sides of the end of the first through groove 11, as Figure 7 shown.

[0042] The present application further provides an electronic device, and the electronic device may include the wireless charging module described in each of the above embodiments. Exemplarily, the electronic device may be an electronic consumer product such as a mobile phone, a tablet computer, a watch, a headset, or a wireless charging stand.

[0043] For the corresponding working principles and processes of the electronic device, refer to the description of the wireless charging module in the foregoing embodiments of the present invention, and details are not described herein again.

[0044] The following further illustrates the present application with specific embodiments.

[0045] Comparative Example

[0046] No grooves are made on the shielding member.

[0047] Example 1

[0048] Compared with the comparative example, the difference is only that four linear first through grooves 11 are formed on the shielding member 10.

[0049] Example 2

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

[0051] Example 3

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

[0053] Example 4

[0054] Compared with the first embodiment, the only difference is that a second through groove 12 is added, and the second through groove 12 is perpendicular to the first through groove 11 .

[0055] Example 5

[0056] Compared with the second embodiment, the only difference is that a second through groove 12 is added, and the second through groove 12 is perpendicular to the first through groove 11 .

[0057] Example 6

[0058] Compared with the embodiment 3, the only difference is that the second through slot 12 is added, and the second through slot 12 is not perpendicular to the first through slot 11. The specific structure is as follows: Figure 8 shown.

[0059] Example 7

[0060] Compared with the third embodiment, the only difference is that a second through groove 12 is added, 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), (c), Examples 4-6 correspond to Figure 6 (a), (b), and (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 with the comparative example, embodiments 1-6 of the present application can improve the problem of eddy current loss and reduce the resistance of the wireless charging module. And on the basis of adding the first through groove 11, adding the second through groove 12 can further reduce the eddy current loss. Among them, the zigzag first through groove 11 + vertical second through groove 12 of embodiment 7 has the best effect, but compared with the linear first through groove 11 + vertical second through groove 12 of embodiment 4, the vertical angle control of the second through groove 12 is more difficult.

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

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

[0067] The length of the first through slot 11 is 16.5 mm and the width is 2 mm;

[0068] The length of the second through slot 12 is 5 mm and the width is 2 mm.

[0069] The sawtooth angle is 135°.

[0070] The above has introduced in detail a wireless charging module and an electronic device provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. It should be noted that in the present application, the descriptions of each embodiment have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] It should be understood that the terms "comprising" and "including" indicate the presence of the described 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", "including at least one of the following" used in the present application can be interpreted inclusively, or mean any one or any combination. For example, "including 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". Another example, "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". An exception to this definition only occurs 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 article to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information can also be called the second information, and similarly, the second information can also be called the first information. Depending on the context, in the present application, the singular forms "a", "an", and "the" are also intended to include the plural forms, unless there is a contrary indication in the context.

[0073] It should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "upper", "lower", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0074] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Each technical feature of the technical solution of the present application can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above embodiments are described. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, as long as the combination of these technical features does not conflict, is similarly included in the patent protection scope of the present application.

Claims

1. A wireless charging module, characterized in that, It includes a shielding member and a charging coil disposed on the shielding member; The shielding member is provided with a first through groove which extends to the edge of the shielding member, and at least completely covers the charging coil along the radial direction of the charging coil, and the width of the first through groove is 0.5 - 5 mm.

2. The wireless charging module according to claim 1, wherein The first through groove is linear, smoothly curved or serrated, and the charging coil is adhered to the surface of the shielding member.

3. The wireless charging module according to claim 1, wherein Multiple first through grooves are provided.

4. The wireless charging module according to claim 3, wherein The multiple first through grooves are evenly distributed along the circumferential direction of the charging coil.

5. The wireless charging module according to claim 4, wherein The first through groove is smoothly curved, and all the first through grooves are curved in the clockwise direction or in the counterclockwise direction.

6. The wireless charging module according to claim 1, wherein The shielding member is an amorphous soft magnetic alloy shielding member, a nanocrystalline soft magnetic alloy shielding member or a soft ferrite shielding member.

7. The wireless charging module according to any one of claims 1-6, characterized in that, The shielding member is further provided with a second through groove which is disposed at one end of the first through groove close to the center of the charging coil.

8. The wireless charging module according to claim 7, wherein The first through groove is connected to the middle of the second through groove, and the second through groove is perpendicular to the first through groove.

9. An electronic device, characterized in that, It includes the wireless charging module according to any one of claims 1 - 8.

10. The electronic device according to claim 9, wherein The electronic device is a mobile phone, a tablet, a watch, a headset or a wireless charging stand.

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