Wireless charging coil, wireless charging module and electronic device

Abstract

The application relates to a wireless charging coil, a wireless charging module and an electronic device. The wireless charging coil comprises a first coil bundle and a second coil bundle. The first coil bundle comprises multiple turns of coils arranged from inside to outside; the second coil bundle is arranged outside the first coil bundle and comprises multiple turns of coils arranged from inside to outside; wherein the distance between at least part of the coils of the second coil bundle and the outermost turn of coils of the first coil bundle in the radial direction is greater than the distance between two adjacent turns of coils in the first coil bundle in the radial direction. The wireless charging coil is beneficial to improving the alignment area of the coils when the coils are misaligned, beneficial to the coupling between the coils and improving the wireless charging power, reducing the alignment requirements of the coils, thereby being beneficial to improving the application range and charging performance of the wireless charging coil.

Description

Technical Field

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

[0002] In recent years, with the rapid development of new energy and electric vehicles, the application of in-vehicle wireless charging has become increasingly widespread. In in-vehicle wireless charging, the transmitting coil of the in-vehicle wireless charging device and the receiving coil of portable devices such as smartphones can transmit wireless power through electromagnetic induction or magnetic resonance, thereby charging the rechargeable batteries of portable devices. However, traditional wireless charging requires precise alignment of the transmitting and receiving coils, which limits its application range and charging performance. Utility Model Content

[0003] This application provides a wireless charging coil, a wireless charging module, and an electronic device to solve the problem that traditional wireless charging functions have high requirements for the alignment of the transmitting coil and the receiving coil.

[0004] A wireless charging coil, comprising:

[0005] The first coil bundle includes multiple turns of coil arranged sequentially from the inside out;

[0006] The second coil bundle is located outside the first coil bundle and includes multiple turns of coil arranged sequentially from the inside to the outside;

[0007] Wherein, the radial distance between at least a portion of the coil of the second coil bundle and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns of the first coil bundle.

[0008] A wireless charging module includes a substrate and a wireless charging coil as described above, wherein the wireless charging coil is disposed on the substrate.

[0009] An electronic device includes a wireless charging coil as described above, or includes a wireless charging module as described above.

[0010] In the aforementioned wireless charging coil, the radial distance between at least a portion of the second coil bundle and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns in the first coil bundle, thus making at least a portion of the second coil bundle expand outward relative to the first coil bundle. In this way, during wireless charging, when there is a positional misalignment between the wireless charging coil and the transmitting or receiving coil, the expanded portion of the second coil bundle can still align with the transmitting or receiving coil. This increases the alignment area of ​​the coils when they are misaligned, which is beneficial for coupling between coils and improving wireless charging power. It also reduces the alignment requirements of the coils, thereby improving the applicability and charging performance of the wireless charging coil. Furthermore, the expanded portion of the second coil bundle can also form a buffer around the magnetic conductor such as a magnet or ferrite, partially separating the alternating magnetic field of the wireless charging coil from the fixed magnetic field of the magnetic conductor in space. This helps reduce magnetic saturation caused by the direct superposition of the alternating and fixed magnetic fields, thus mitigating the bias effect of the fixed magnetic field on the alternating magnetic field.

[0011] Furthermore, in some embodiments of this application, the coupling area of ​​the wireless charging coil is increased by only partially expanding the second coil bundle, which does not excessively increase the overall outer diameter and space occupied by the wireless charging coil. This avoids excessively affecting the mutual interference between the wireless charging coil and other wireless communication modules in the electronic device, making it easier for the wireless charging coil to meet the antenna coexistence requirement (ACR) in the electronic device. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of an electronic device in some embodiments.

[0014] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the electronic device along the I-I' direction.

[0015] Figure 3 This is a schematic diagram of the structure of the wireless charging coil in some embodiments.

[0016] Figure 4 for Figure 3 The diagram shows the structure of the wireless charging coil and the wireless charging device.

[0017] Figure 5 This is a schematic diagram of the structure of the wireless charging coil in some other embodiments.

[0018] Figure 6 This is a schematic diagram of the structure of the wireless charging coil in some other embodiments.

[0019] Figure 7 for Figure 6 The diagram shows the structure of the wireless charging coil and the wireless charging device.

[0020] Figure 8 This is a schematic diagram of the structure of a wireless charging coil in some embodiments.

[0021] Figure 9 for Figure 8 The diagram shows the structure of the wireless charging coil and the wireless charging device.

[0022] Figure 10 This is a schematic diagram of the structure of a wireless charging module in some embodiments.

[0023] Figure 11 for Figure 10 The diagram shows the structure of the wireless charging module from another angle.

[0024] Figure 12 for Figure 10 The diagram shows the structure of the wireless charging module from another angle.

[0025] Figure 13 This is a schematic diagram of the structure of a portable device in some embodiments.

[0026] Figure label:

[0027] 10. Portable device; 11. Non-contact power receiving module; 12. First housing; 121. Camera hole; 13. Decorative ring; 14. Camera; 15. Battery; 20. Wireless charging device; 21. Non-contact power transmission module; 22. Second housing; 23. Voltage conversion unit; 30. Wireless charging coil; 31. First coil bundle; 32. Second coil bundle; 321. Coil body; 322. Extension structure; 3221. Extension; 3222. Connecting part; 33. Hollowed-out area; 41. First terminal; 42. Second terminal; 43. First direction; 44. Second direction; 50. Wireless charging module; 51. Substrate. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0029] Please see Figure 1 , Figure 2 and Figure 3 As shown, Figure 1 The present application shows schematic diagrams of the structure of electronic devices in some embodiments. Figure 2 It shows Figure 1 The diagram shows a cross-sectional view of the electronic device along line I-I'. Figure 3 This is a schematic diagram of the structure of the wireless charging coil 30 in some embodiments. The electronic device provided in this application can be a portable device 10 or a wireless charging device 20.

[0030] Portable devices 10 include, but are not limited to, smartphones, tablets, or e-readers equipped with a contactless power receiving module 11 that enables wireless charging. In the accompanying drawings of this application, a smartphone is used as an example. Wireless charging devices 20 include, but are not limited to, charging docks and in-vehicle wireless chargers equipped with a contactless power transmission module 21 that enable wireless charging. In the embodiments of this application, an in-vehicle wireless charger is used as an example.

[0031] The electronic device includes a housing. In this application, when the electronic device is a portable device 10, the housing is exemplified by a first housing 12; when the electronic device is a wireless charging device 20, the housing is exemplified by a second housing 22. The portable device 10 includes a first housing 12 and a battery 15. Both the battery 15 and a contactless power receiving module 11 are disposed within the first housing 12. The contactless power receiving module 11 is used to provide power to the battery 15 to charge it. The battery 15 may be a rechargeable battery (or a secondary battery), and the battery 15 may be detachably attached to the first housing 12. The contactless power receiving module 11 may be directly attached to the inner surface of the first housing 12, or it may be positioned as close as possible to the inner surface of the first housing 12.

[0032] The wireless charging device 20 is configured to charge the battery 15 of the portable device 10. The wireless charging device 20 includes a second housing 22 and a voltage conversion unit 23, both housed within the second housing 22. The voltage conversion unit 23 converts externally supplied household AC power into DC power, then converts the DC power into AC voltage with a specific frequency, and provides the converted AC voltage to the contactless power transmission module 21. When the AC voltage is applied to the wireless charging coil 30 within the contactless power transmission module 21, the magnetic field around the wireless charging coil 30 changes. Based on this magnetic field change, a voltage is applied to the contactless power receiving module 11 of the portable device 10, which is positioned adjacent to the contactless power transmission module 21, thereby charging the battery 15.

[0033] refer to Figure 3 As shown, in some embodiments, the wireless charging coil 30 includes a first coil bundle 31 and a second coil bundle 32. The first coil bundle 31 and the second coil bundle 32 can be arranged on the same plane, and the second coil bundle 32 is located outside the first coil bundle 31. Both the first coil bundle 31 and the second coil bundle 32 include multiple turns of coil arranged sequentially from the inside out. Figure 3 In the illustrated embodiment, coil a is the innermost turn of the first coil bundle 31, coil b is the outermost turn of the first coil bundle 31, coil c is the innermost turn of the second coil bundle 32, and coil d is the outermost turn of the second coil bundle 32. Both the first coil bundle 31 and the second coil bundle 32 can have helical wiring, meaning that the turns of the first coil bundle 31 are connected sequentially to form a helix, and the turns of the second coil bundle are connected sequentially to form a helix.

[0034] The first coil bundle 31 and the second coil bundle 32 can be connected to each other, thus forming a spiral wiring together. The outermost turn of the first coil bundle 31 is connected to the innermost turn of the second coil bundle 32. Figure 3 In the embodiment shown, the wireless charging coil 30 further includes a first terminal 41 and a second terminal 42. The wireless charging coil 30 can be connected to other components through the first terminal 41 and the second terminal 42. The first terminal 41 is electrically connected to the innermost turn of the first coil bundle 31, and the second terminal 42 is electrically connected to the outermost turn of the second coil bundle 32, so that the first terminal 41, the first coil bundle 31, the second coil bundle 32 and the second terminal 42 form a series circuit.

[0035] When the electronic device is a portable device 10, the first terminal 41 and the second terminal 42 can be electrically connected to the positive and negative terminals of the battery 15, respectively. When the electronic device is a wireless charging device 20, the first terminal 41 and the second terminal 42 can both be electrically connected to the voltage conversion unit 23.

[0036] Of course, the first coil bundle 31 and the second coil bundle 32 can also be electrically connected in other ways, or the first coil bundle 31 and the second coil bundle 32 are not directly electrically connected, but are each electrically connected to other components through different terminals.

[0037] Furthermore, in some embodiments, the radial distance between at least a portion of the coils of the second coil bundle 32 and the outermost turn of the first coil bundle 31 is greater than the radial distance between two adjacent turns in the first coil bundle 31. That is, at least a portion of the second coil bundle 32 extends outward relative to the first coil bundle 31, for example, in… Figure 3 In the embodiment shown, the portion of the second coil bundle 32 located on the positive side of the first coil bundle 31 in the first direction 43 extends outward relative to the first coil bundle 31.

[0038] Thus, in wireless charging, when there is a positional offset between the wireless charging coil 30 and the transmitting or receiving coil, the extended portion of the second coil bundle 32 can also be aligned with the transmitting or receiving coil. This increases the relative area of ​​the coils when they are misaligned, which is beneficial for coupling between the coils and increasing the wireless charging power. It also reduces the alignment requirements of the coils, thereby improving the applicability and charging performance of the wireless charging coil 30.

[0039] The following explains the function of the second coil bundle 32 expanding outward relative to the first coil bundle 31, in conjunction with... Figure 4 As shown, Figure 4 The diagram illustrates the relative positional relationship between the wireless charging coil 30 and the coil of the wireless charging device 20 (in this embodiment, a car wireless charger is used as an example) during wireless charging, when the wireless charging coil 30 is disposed on the portable device 10, i.e., when the electronic device is a portable device 10. Figure 4 In this diagram, only the outer contour of the wireless charging coil 30 is shown to facilitate understanding of the relationship between the wireless charging coil 30 and the coil of the wireless charging device 20.

[0040] It is understood that the wireless charging device 20 may have multiple coils, with the coil located in the middle position partially overlapping with the coils located at both ends. When the wireless charging device 20 wirelessly charges a portable device 10 such as a smartphone, the wireless charging device 20 first detects the coil with the highest coupling power to the wireless charging coil 30 of the portable device 10 among its three coils, and then energizes the coil with the highest coupling power, causing the coil to generate a magnetic field. Through the interaction between the coil of the wireless charging device 20 and the magnetic field of the wireless charging coil 30, the wireless charging coil 30 can generate electrical energy to charge the battery 15.

[0041] Traditional portable devices typically use concentric spiral wiring. Due to the limitations of the overall structure layout, the geometric center of the wireless charging coil is usually offset from the geometric center of the casing. This causes the wireless charger of the portable device to be located at the overlapping point of two adjacent coils of the car wireless charger when the portable device is placed on the car wireless charger. This results in low coupling power between the wireless charging coil and the car wireless charger, and inconvenient alignment, affecting the applicability and charging performance of the wireless charging coil.

[0042] In some embodiments of this application, the wireless charging coil 30 has at least a portion of the second coil bundle 32 extending outward relative to the first coil bundle 31. When the portable device 10 is placed on the wireless charging device 20 for wireless charging, even if the first coil bundle 31 is located at the overlap of two adjacent coils of the wireless charging device 20, the extended portion of the second coil bundle 32 can still be aligned with the coil of the wireless charging device 20. This increases the coupling power between the wireless charging coil 30 and one of the coils of the wireless charging device 20, thereby increasing the charging power of the wireless charging device 20 for the portable device 10. This improves the applicability and charging performance of the wireless charging coil 30 and reduces the alignment requirements of the wireless charging function on the portable device 10 and the wireless charging device 20. In addition, the extended portion of the second coil bundle 32 can also form a buffer around the magnetic conductor such as a magnet or ferrite, so that the alternating magnetic field of the wireless charging coil 30 and the fixed magnetic field of the magnetic conductor are partially separated in space. This helps to reduce magnetic saturation caused by the direct superposition of the alternating magnetic field and the fixed magnetic field, thereby mitigating the bias effect of the fixed magnetic field on the alternating magnetic field.

[0043] Furthermore, in some embodiments of this application, the coupling area of ​​the wireless charging coil 30 is increased only by expanding at least part of the second coil bundle 32, without excessively increasing the overall outer diameter and space occupied by the wireless charging coil 30. This avoids excessively affecting the mutual interference between the wireless charging coil 30 and other wireless communication modules in the electronic device, making it easier for the wireless charging coil 30 to meet the antenna coexistence requirement (ACR) in the electronic device.

[0044] certainly, Figure 4 The diagram is only an illustration of a wireless charging device 20 in one embodiment. The wireless charging device 20 may also have two coils or only one coil. When the wireless charging device 20 has other numbers of coils, if the wireless charging coil 30 is offset relative to the coil of the wireless charging device 20, the outer portion of the second coil bundle 32 relative to the first coil bundle 31 can also be opposite to the coil of the wireless charging device 20, so as to improve the coupling power between the wireless charging coil 30 and the coil of the wireless charging device 20.

[0045] In other embodiments, when the electronic device is a wireless charging device 20, the wireless charging coil 30 is disposed in the wireless charging device 20. When the wireless charging device 20 wirelessly charges the portable device 10, the portion of the second coil bundle 32 in the wireless charging coil 30 that expands outward relative to the first coil bundle 31 can also increase the alignable area between the wireless charging coil 30 and the coil of the portable device 10. This allows the wireless charging coil 30 and the coil of the portable device 10 to still be coupled through the expanded portion of the second coil bundle 32 when they are relatively offset, thereby improving the applicability and charging performance of the wireless charging coil 30.

[0046] Please see again. Figure 3 In some embodiments, the coil of the second coil bundle 32 includes a coil body 321 and an extension structure 322. The radial distance between the extension structure 322 and the outermost turn of the first coil bundle 31 is greater than the radial distance between two adjacent turns in the first coil bundle 31, and also greater than the radial distance between the coil body 321 and the outermost turn of the first coil bundle 31. That is, the second coil bundle 32 is only partially extended relative to the first coil bundle 31, and the extension structure 322 is the portion of the second coil bundle 32 that is extended relative to the first coil bundle 31.

[0047] The extension structure 322 of the second coil bundle 32 extends outward relative to the first coil bundle 31, effectively increasing the coupling range of the wireless charging coil 30 with other coils, thereby improving the applicability and charging performance of the wireless charging coil 30. Meanwhile, the coil body 321 does not extend outward relative to the first coil bundle 31, which helps maintain the compact structure of the wireless charging coil 30, reduces its space occupation, facilitates its assembly in electronic devices, and also helps reduce the impact of the extension structure 322 on the magnetic field distribution of the wireless charging coil 30, improving its coupling performance.

[0048] In this application, the radial direction can be the radial direction of the circumference formed by the winding of the wireless charging coil 30. When the wireless charging coil 30 adopts a spiral wiring, the extension direction of the coil corresponds to the circumference of the wireless charging coil 30, and the radial direction is perpendicular to the circumference. Figure 3 The extension directions of the first terminal 41 and the second terminal 42 shown correspond to the radial directions of the two positions.

[0049] In some embodiments, the extension structure 322 is located on one side of the first coil bundle 31 in the positive direction of the first direction 43, which is parallel to the plane on which the wireless charging coil 30 is disposed. When the wireless charging coil 30 is applied to the portable device 10, the first direction 43 can correspond to the length direction of the portable device 10. Therefore, when the overall layout of the portable device 10 causes the geometric center of the wireless charging coil 30 to shift relative to the geometric center of the first housing 12 (e.g., shifting in the negative direction of the first direction 43), the extension structure 322 can be located on one side of the first coil bundle 31 in the positive direction of the first direction 43, i.e., in the opposite direction of the shift. Thus, when the wireless charging coil 30 shifts relative to the first housing 12, causing the portable device 10 to shift relative to the coil of the wireless charging device 20 when placed on the wireless charging device 20, the extension structure 322 can more easily align with the coil of the wireless charging device 20, improving the coupling power between the wireless charging coil 30 and the coil of the wireless charging device 20. In this way, the orientation of the extension structure 322 can better adapt to the layout constraints of the portable device 10, improving the adaptability and charging performance of wireless charging.

[0050] refer to Figure 4 As shown, when the wireless charging device 20 is a vehicle-mounted wireless charger with multiple coils, the first direction 43 can correspond to the arrangement direction of the multiple coils of the wireless charging device 20. This also helps to ensure that when the first coil bundle 31 is deviated from the coil or located at the overlap of two adjacent coils, the extension structure 322 can be better aligned with one of the coils, thereby improving the adaptability and charging performance of wireless charging.

[0051] In some embodiments, the outermost coil of the first coil bundle 31 and the innermost coil of the second coil bundle 32 together form the hollow region 33 of the wireless charging coil 30. The hollow region 33 provides sufficient spacing between the outermost coil of the outermost coil of the first coil bundle 31, increasing the outward extension distance of the outermost coil of the outermost coil of the first coil bundle 31, thereby effectively increasing the coupling range of the wireless charging coil 30. Furthermore, when the wireless charging device 20 is installed in an electronic device, the hollow region 33 can also be used to arrange any suitable components, such as magnetic conductive parts, that do not easily affect the magnetic field distribution of the wireless charging coil 30, which helps to improve the structural compactness of the electronic device.

[0052] In some embodiments, the extension structure 322 includes an extension 3221 and two connecting portions 3222. The two connecting portions 3222 are connected to both ends of the extension 3221 and are both connected to the coil body 321. The extension 3221 is spaced apart from the coil body 321 and located outside the coil body 321. The connecting portions 3222 can establish an electrical connection between the extension 3221 and the coil body 321, and the fact that the extension 3221 is located outside the coil body 321 can effectively increase the coupling range of the wireless charging coil 30.

[0053] In some embodiments, both the coil body 321 and the extension 3221 are arc-shaped. The radius of curvature of the coil body 321 is adapted to the radius of curvature of the coil in the first coil bundle 31, and the radius of curvature of the extension 3221 is larger than the radii of curvature of both the coil body 321 and the coil in the first coil bundle 31. The adaptation of the radius of curvature of the coil body 321 to the radius of curvature of the coil in the first coil bundle 31 reduces the impact of the extension structure 322 on the magnetic field distribution of the wireless charging coil 30, thus improving the coupling performance of the wireless charging coil 30. The larger radius of curvature of the extension 3221 optimizes the magnetic field distribution of the wireless charging device 20, enabling the extension structure 322 to have good coupling performance, thereby effectively increasing the coupling range of the wireless charging coil 30.

[0054] refer to Figure 3 As shown, in some embodiments, the radial distance between two adjacent extensions 3221 is adapted to the radial distance between two adjacent coil bodies 321. That is, the radial spacing between two adjacent coils in the second coil bundle 32 at the coil body 321 and at the extension 3221 is equal. With this configuration, the extensions 3221 can maintain the same radial density as the coil bodies 321, forming a uniformly expanding spiral structure. This is beneficial for improving the uniformity of the magnetic field distribution of the wireless charging coil 30, avoiding excessive distortion of the magnetic field distribution caused by the epitaxial structure 322, reducing the risk of overheating, reducing the difficulty of forming the epitaxial structure 322, improving the yield of the wireless charging coil 30, and also reducing the space occupied by the epitaxial structure 322.

[0055] refer to Figure 5 As shown, in some embodiments, the radial distance between two adjacent extensions 3221 is greater than the radial distance between two adjacent coil bodies 321. In other words, the arrangement of the second coil bundle 32 at the extension structure is sparser than its arrangement at the coil body 321. This arrangement increases the shared area occupied by multiple extension structures, thereby further expanding the coupling area of ​​the wireless charging coil 30 and improving the misalignment tolerance of the wireless charging coil 30 during wireless charging.

[0056] Furthermore, in some embodiments, the distance between two adjacent epitaxial structures 322 gradually increases in the direction from both ends of the epitaxial structure 322 towards the middle. Thus, through the gradual design of the arrangement density of the epitaxial structures 322, the occupied area of ​​the epitaxial structures 322 is increased to expand the coupling area of ​​the wireless charging coil 30, effectively improving the misalignment tolerance of the wireless charging coil 30. Simultaneously, this optimizes the magnetic field distribution at the epitaxial structures 322, improving the coupling performance of the wireless charging coil 30 at the epitaxial structures 322 and preventing a severe decrease in coupling performance due to excessively low arrangement density of the epitaxial structures 322.

[0057] In some embodiments, the extension structure 322 is disposed outside the first coil bundle 31 in any one or more of the following directions: the positive direction of the first direction 43, the negative direction of the first direction 43, the positive direction of the second direction 44, and the negative direction of the second direction 44. The first direction 43 and the second direction 44 are two mutually perpendicular directions on the plane parallel to the wireless charging coil 30. Figure 3 and Figure 5 In the embodiments shown, the extensional structures 322 are all located only on the positive side of the first coil bundle 31 in the first direction 43.

[0058] refer to Figure 6 and Figure 7 As shown, in some embodiments, the epitaxial structure 322 may also be simultaneously disposed on the outside of both the positive and negative directions of the first coil bundle 31 in the first direction 43. In this case, the coil of the second coil bundle 32 includes two epitaxial structures 322, which are correspondingly disposed on the outside of both the positive and negative directions of the first coil bundle 31 in the first direction 43. The two epitaxial structures 322 can be mirror-symmetrical about a line parallel to the second direction 44. This arrangement allows the epitaxial structures 322 to increase the coupling area of ​​the wireless charging coil 30 on both opposite sides of the first coil bundle 31, further improving the misalignment tolerance of the wireless charging coil 30 during wireless charging and expanding the applicability of the wireless charging coil 30. For example, refer to... Figure 7 As shown, when the wireless charging coil 30 is applied to the portable device 10 and the wireless charging device 20 is provided with multiple coils, if the first coil bundle 31 is located at the overlap of two adjacent coils in the wireless charging device 20, the extension structure 322 can be opposite to different coils on the opposite sides of the first coil bundle 31, thereby improving the coupling flexibility and coupling power between the wireless charging coil 30 and the coil of the wireless charging device 20.

[0059] Of course, in this embodiment, the wireless charging coil 30 can also be applied to the wireless charging device 20. When the wireless charging device 20 charges the portable device 10, the first direction 43 can correspond to the length direction of the portable device 10. Then, the extension structure 322 can couple with the coil of the portable device 10 on both sides of the first coil bundle 31 opposite to the first direction 43. This also helps to improve the misalignment tolerance between the wireless charging device 20 and the portable device 10 and improve the applicability of the wireless charging device 20. Depending on the different alignment and layout requirements of the wireless charging coil 30, the wireless charging coil 30 can also be extended outward in both the first direction 43 and the second direction 44 to form an extension structure, as long as it can increase the coupling area of ​​the wireless charging coil 30. This will not be elaborated in this application.

[0060] exist Figures 3 to 7 In the embodiment shown, the second coil bundle 32 is only partially extended outward relative to the first coil bundle 31, while the reference... Figure 8 and Figure 9 As shown, in some embodiments, the second coil bundle 32 may also be extended outward relative to the first coil bundle 31. In this case, the second coil bundle 32 and the first coil bundle 31 are radially spaced apart. The radial distance between the innermost turn of the second coil bundle 32 and the outermost turn of the first coil bundle 31 is greater than the radial distance between two adjacent turns in the first coil bundle 31, and also greater than the radial distance between two adjacent turns in the second coil bundle 32. By setting the second coil bundle 32 to be extended outward relative to the first coil bundle 31, the second coil bundle 32 can increase the coupling area of ​​the wireless charging coil 30 in all directions circumferentially outside the first coil bundle 31, effectively improving the misalignment tolerance of the wireless charging coil 30 during wireless charging.

[0061] For example, refer to Figure 9 As shown, when the wireless charging coil 30 is applied in the portable device 10, if the wireless charging device 20 has multiple coils, during the wireless charging process, if the first coil bundle 31 is located at the overlap of two adjacent coils, the second coil bundle 32 expands outward relative to the first coil bundle 31, making it easier for the second coil bundle 32 to couple with the coils of the wireless charging device 20, thereby improving the coupling performance and applicability of the wireless charging device 20. Figure 9 Only the outer contours of the first coil bundle 31 and the second coil bundle 32 are shown in the diagram.

[0062] In some embodiments, when the second coil bundle 32 is expanded outward relative to the first coil bundle 31, the radial distance between adjacent coils in the second coil bundle 32 is adapted, and the radial distance between adjacent coils in the second coil bundle 32 can be approximately equal, that is, the coils in the second coil bundle 32 are uniformly arranged. In this way, while expanding the coupling area of ​​the wireless charging coil 30 to improve misalignment tolerance, it also helps to improve the uniformity of the magnetic field distribution of the second coil bundle 32, thereby improving the coupling power of the wireless charging coil 30.

[0063] In some embodiments, the number of turns of the coils in the second coil bundle 32 is less than the number of turns of the coils in the first coil bundle 31. This configuration, by partially or entirely expanding the second coil bundle 32 to increase the coupling range and misalignment tolerance of the wireless charging coil 30, while reducing the number of turns of the coils in the second coil bundle 32, can shorten the overall length of the wireless charging coil 30. This helps reduce the ohmic loss and temperature rise of the wireless charging coil 30, suppresses the inductive reactance of the wireless charging coil 30, improves high-frequency energy transmission performance, and optimizes the magnetic field distribution of the wireless charging coil 30, reducing the risk of mutual repulsion between the magnetic fields of the first coil bundle 31 and the second coil bundle 32.

[0064] In some embodiments, both the first coil bundle 31 and the second coil bundle 32 are spirally wired, and the winding directions of the first coil bundle 31 and the second coil bundle 32 are the same. With this configuration, the magnetic field directions of the first coil bundle 31 and the second coil bundle 32 are aligned, allowing the magnetic fields to superimpose and increase coupling power while suppressing eddy current losses. Simultaneously, the first coil bundle 31 and the second coil bundle 32 can be powered in parallel through the first terminal 41 and the second terminal 42, which simplifies the driving circuit of the wireless charging coil 30.

[0065] refer to Figure 10 As shown, based on the wireless charging coil 30 described in any of the above embodiments, this application also provides a wireless charging module 50, including a substrate 51 and a wireless charging coil 30 as described in any of the above embodiments, wherein the wireless charging coil 30 is disposed on the substrate 51. It should be noted that the wireless charging coil 30 can be used alone in electronic devices such as the wireless charging device 20 or the portable device 10. For example, the wireless charging coil 30 can be a multi-strand Litz wire wound coil. The wireless charging coil 30 can also be combined with the substrate 51 to form a wireless charging module 50 for use in the wireless charging device 20 or the portable device 10. When the wireless charging module 50 is used in the wireless charging device 20, the wireless charging module 50 can be a contactless power transmission module 21 of the wireless charging device 20. When the wireless charging module 50 is used in the portable device 10, the wireless charging module 50 can be a contactless power receiving module 11 of the wireless charging device 20.

[0066] The form of the wireless charging module 50 is not limited, that is, the specific arrangement of the substrate 51 is not limited. In some embodiments, the substrate 51 can be a flexible printed circuit board (FPC), and the wireless charging coil 30 can be a thin-film coil disposed on the substrate 51, with connection lines for the wireless charging coil 30 disposed on the substrate 51. In other embodiments, the substrate 51 can also be a magnetically conductive component such as ferrite, which provides structural support for the wireless charging coil 30 while also providing magnetic field gain, thereby increasing the coupling power of the wireless charging coil 30.

[0067] In some embodiments, the wireless charging module 50 includes two wireless charging coils 30, which are disposed one-to-one on opposite surfaces of the substrate 51. The arrangement of the double-sided wireless charging coils 30 enhances the coupling power. In this embodiment, the second coil bundles 32 of the two wireless charging coils 30 of the wireless charging module 50 can be partially or completely extended relative to the first coil bundle 31 to increase the coupling range and misalignment tolerance of the wireless charging module 50.

[0068] Furthermore, combined Figure 10 , Figure 11 and Figure 12 As shown, in some embodiments, two wireless charging coils 30 are disposed on opposite surfaces of the substrate 51 in a one-to-one correspondence. The extension structure 322 of one wireless charging coil 30 is disposed on one side of the first coil bundle 31 in the positive direction of the first direction 43, and the extension structure 322 of the other wireless charging coil 30 is disposed on one side of the first coil bundle 31 in the negative direction of the first direction 43. The positions of the first coil bundle 31 of the two wireless charging coils 30 can correspond to each other. Figure 11 and Figure 12 The diagram illustrates the arrangement of the wireless charging coils 30 on two opposing surfaces of the substrate 51. This arrangement allows the outward expansion directions of the extensional structures 322 of the two wireless charging coils 30 to complement each other, effectively increasing the coupling range and misalignment tolerance of the wireless charging module 50 while reducing its manufacturing cost.

[0069] Combination Figure 2 and Figure 13 As shown, based on the wireless charging coil 30 or wireless charging module 50 described in any of the above embodiments, this application also provides an electronic device. The electronic device can be a wireless charging device 20 for wirelessly charging a portable device 10, including but not limited to charging docks, car wireless chargers, etc. The electronic device can also be a portable device 10 for receiving electrical energy transmitted by the wireless charging device 20, including but not limited to smartphones, tablets, e-readers, etc. Figure 13Taking a smartphone as an example of an electronic device, the electronic device may include the wireless charging coil 30 of any of the above embodiments, or the wireless charging module 50 of any of the above embodiments. The wireless charging coil 30 or the wireless charging module 50 is disposed inside the housing of the electronic device and is used to transmit electrical energy through the action of a magnetic field, or to receive electrical energy through the action of a magnetic field.

[0070] Furthermore, when the electronic device is a portable device 10, in some embodiments, the electronic device includes a first housing 12 and a decorative ring 13. The first housing 12 is provided with a camera hole 121, through which one or more cameras 14 in the electronic device can receive light. A wireless charging coil 30 is disposed inside the first housing 12, and the decorative ring 13 is disposed in the first housing 12 and covers the camera hole 121 to provide a sealing and protection for the camera 14. The projection of the extension structure 322 of the wireless charging coil 30 onto the plane of the decorative ring 13 is located outside the camera hole 121 and at least partially falls within the decorative ring 13.

[0071] Understandably, due to the structural layout requirements of traditional electronic devices, the geometric center of the wireless charging coil is usually offset relative to the geometric center of the casing, for example, offset in the negative direction relative to the geometric center of the casing. Therefore, when using concentric spiral wiring for wireless charging coils in traditional electronic devices, the entire wireless charging coil is offset in the negative direction relative to the casing, and the entire wireless charging coil is usually located outside the decorative ring. This makes alignment between the electronic device and the wireless charging device difficult, easily leading to low coupling efficiency due to the offset, thus affecting the applicability and coupling power of the wireless charging coil.

[0072] In some embodiments of this application, the wireless charging coil 30 is provided with the second coil bundle 32 at least partially extended outward relative to the first coil bundle 31. This allows the extension structure 322 to be located on the positive side of the first coil bundle 31 in the first direction 43. This enables the extension structure 322 to extend to the location of the decorative ring 13 in the opposite direction to the offset direction of the wireless charging coil 30 relative to the first housing 12. This not only avoids affecting the overall structural layout of the electronic device, but also helps to compensate for the offset of the wireless charging coil 30 relative to the first housing 12. This allows the extension structure 322 to increase the coupling area of ​​the wireless charging coil 30 on the positive side of the first direction 43 of the first coil bundle 31, reducing the alignment accuracy and misalignment tolerance of the electronic device and the wireless charging device 20.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A wireless charging coil, characterized in that, include: The first coil bundle includes multiple turns of coil arranged sequentially from the inside out; The second coil bundle is located outside the first coil bundle and includes multiple turns of coil arranged sequentially from the inside to the outside; Wherein, the radial distance between at least a portion of the coil of the second coil bundle and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns in the first coil bundle; The number of turns of the coil in the second coil bundle is less than the number of turns of the coil in the first coil bundle; The coil of the second coil bundle includes a coil body and an extension structure. The radial distance between the extension structure and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns in the first coil bundle, and also greater than the radial distance between the coil body and the outermost turn of the first coil bundle.

2. The wireless charging coil according to claim 1, characterized in that, The outermost coil of the first coil bundle and the outermost coil of the second coil bundle together form the hollow area of ​​the wireless charging coil.

3. The wireless charging coil according to claim 1, characterized in that, The extension structure includes an extension portion and two connecting portions. The two connecting portions are connected to both ends of the extension portion and are both connected to the coil body. The extension portion is spaced apart from the coil body and located outside the coil body.

4. The wireless charging coil according to claim 3, characterized in that, Both the coil body and the extension are arc-shaped. The radius of curvature of the coil body is adapted to the radius of curvature of the coil in the first coil bundle, and the radius of curvature of the extension is greater than that of the coil body and the coil in the first coil bundle.

5. The wireless charging coil according to claim 3, characterized in that, The radial distance between two adjacent extensions is adapted to the radial distance between two adjacent coil bodies.

6. The wireless charging coil according to claim 3, characterized in that, The radial distance between two adjacent extensions is greater than the radial distance between two adjacent coil bodies.

7. The wireless charging coil according to claim 6, characterized in that, In the direction from both ends of the epitaxial structure toward the middle, the distance between two adjacent epitaxial structures gradually increases.

8. The wireless charging coil according to claim 1, characterized in that, The extension structure is located outside the first coil bundle in any one or more of the following directions: the positive direction of the first direction, the negative direction of the first direction, the positive direction of the second direction, and the negative direction of the second direction. The first direction and the second direction are two mutually perpendicular directions on the plane in which the wireless charging coil is set.

9. The wireless charging coil according to claim 8, characterized in that, The coil of the second coil bundle includes two extension structures, which are located outside the first coil bundle in the positive direction and the negative direction of the first direction, and the two extension structures are mirror-symmetrical about a line parallel to the second direction.

10. A wireless charging coil, characterized in that, include: The first coil bundle includes multiple turns of coil arranged sequentially from the inside out; The second coil bundle is located outside the first coil bundle and includes multiple turns of coil arranged sequentially from the inside to the outside; Wherein, the radial distance between at least a portion of the coil of the second coil bundle and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns in the first coil bundle; The number of turns of the coil in the second coil bundle is less than the number of turns of the coil in the first coil bundle; The coil of the second coil bundle includes a coil body and an extension structure. The radial distance between the extension structure and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns in the first coil bundle, and also greater than the radial distance between the coil body and the outermost turn of the first coil bundle. The second coil bundle is radially spaced from the first coil bundle. The radial distance between the innermost turn of the second coil bundle and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns in the first coil bundle and greater than the radial distance between two adjacent turns in the second coil bundle.

11. The wireless charging coil according to claim 10, characterized in that, The radial distances between two adjacent coils in the second coil bundle are adapted.

12. The wireless charging coil according to any one of claims 1-11, characterized in that, Both the first coil bundle and the second coil bundle have helical wiring, and the winding directions of the first coil bundle and the second coil bundle are the same.

13. The wireless charging coil according to any one of claims 1-11, characterized in that, The wireless charging coil includes a first terminal and a second terminal, and the first terminal, the first coil bundle, the second coil bundle, and the second terminal are sequentially electrically connected to form a series circuit.

14. A wireless charging module, characterized in that, It includes a substrate and a wireless charging coil as described in any one of claims 1-13, wherein the wireless charging coil is disposed on the substrate.

15. The wireless charging module according to claim 14, characterized in that, The coil of the second coil bundle includes a coil body and an extension structure. The radial distance between the extension structure and the outermost turn of the first coil bundle is greater than the radial distance between two adjacent turns in the first coil bundle, and greater than the radial distance between the coil body and the outermost turn of the first coil bundle. The wireless charging module includes two wireless charging coils, which are disposed on opposite surfaces of the substrate. The outer structure of one of the wireless charging coils is disposed on one side of the first coil bundle in the positive direction of the first direction, and the outer structure of the other wireless charging coil is disposed on one side of the first coil bundle in the negative direction of the first direction.

16. An electronic device, characterized in that, It includes the wireless charging coil as described in any one of claims 1-13, or the wireless charging module as described in claim 14 or 15.

17. The electronic device according to claim 16, characterized in that, The electronic device further includes a battery, and the wireless charging coil is electrically connected to the battery for charging the battery; or, The electronic device further includes a voltage conversion unit electrically connected to the wireless charging coil. The voltage conversion unit is used to convert AC power into AC voltage with a specific frequency and can provide the converted AC voltage to the wireless charging coil.

18. The electronic device according to claim 16, characterized in that, The electronic device includes a housing and a decorative ring. The housing has a camera hole, the wireless charging coil is disposed inside the housing, and the decorative ring is disposed on the housing and covers the camera hole. The projection of the extension structure of the wireless charging coil on the plane of the decorative ring is outside the camera hole and at least partially falls inside the decorative ring.

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