Wireless charging coil, wireless charging module and electronic device

Abstract

The application discloses a wireless charging coil, a wireless charging module and electronic equipment. The wireless charging coil comprises a hollow area, a coil structure, the coil structure is arranged around the hollow area, the coil structure has a first coil part and a second coil part, along a first direction, the hollow area is located between the first coil part and the second coil part, the first coil part and the second coil part each comprise a plurality of wire groups, the plurality of wire groups are arranged along the first direction, along the first direction, the width of the first coil part is smaller than the width of the second coil part, and the width of the plurality of wire groups of the second coil part gradually decreases.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic devices, and particularly relates to a wireless charging coil, a wireless charging module and an electronic device. BACKGROUND

[0002] As shown in Figure 1 and Figure 2 With the increasing demand for image of electronic devices, the camera module design of the electronic device is getting larger and larger, which occupies the installation area of the wireless charging module 30'.

[0003] In the related art, the wireless charging module 30' includes a wireless charging coil 10', the wireless charging coil 10' includes a hollow area 100' and a plurality of coil wires, the plurality of coil wires are arranged around the hollow area 100', the plurality of coil wires are of an equal-width annular structure, and the diameters of the plurality of coil wires are equal. When the electronic device using the wireless charging module 30' is placed on a charging base, the distance between the center of the wireless charging coil 10' and the center of the coil 80' of the charging base is large. This results in a large area of the hollow part 800' of the coil 80' of the charging base being shielded by the wireless charging module 30' of the electronic device, and at the same time, a large area of the hollow area 100' of the wireless charging coil 10' of the electronic device being shielded by the coil 80' of the charging base. As a result, the charging efficiency of the electronic device is low, and the charging time is long. SUMMARY

[0004] The application aims to provide a wireless charging coil, a wireless charging module and an electronic device, and solve one of the problems that the charging efficiency of the electronic device is affected and the charging time is increased due to the unreasonable structure of the wireless charging module in the related art.

[0005] To solve the above technical problems, the application is implemented as follows:

[0006] In a first aspect, an embodiment of the application provides a wireless charging coil, comprising: a hollow area; a coil structure, the coil structure being arranged around the hollow area; the coil structure having a first coil part and a second coil part, along a first direction, the hollow area being located between the first coil part and the second coil part; the first coil part and the second coil part each comprising a plurality of coil wire groups, the plurality of coil wire groups being arranged along the first direction; along the first direction, the width of the first coil part is smaller than the width of the second coil part, and the widths of the plurality of coil wire groups of the second coil part gradually decrease.

[0007] In a second aspect, an embodiment of the application provides a wireless charging module, comprising: the wireless charging coil as in the first aspect.

[0008] In a third aspect, an electronic device is provided. The electronic device includes a camera module, and the wireless charging module as in the second aspect, the first coil portion is located between the second coil portion and the camera module.

[0009] In the embodiments of the present application, the wireless charging coil includes a hollow region and a coil structure. The coil structure is arranged around the hollow region.

[0010] The coil structure is divided into a first coil portion and a second coil portion. In the first direction, the hollow region is located between the first coil portion and the second coil portion. That is, the first coil portion and the second coil portion are arranged opposite and spaced apart in the first direction.

[0011] The size and structure of the first coil portion and the second coil portion are limited. In the first direction, the width of the first coil portion is smaller than the width of the second coil portion. The first coil portion includes a plurality of trace groups, and the second coil portion includes a plurality of trace groups. The plurality of trace groups of the first coil portion are arranged in the first direction, and the plurality of trace groups of the second coil portion are arranged in the first direction. In the first direction, the width of the plurality of trace groups of the second coil portion gradually decreases.

[0012] The arrangement optimizes the traces of the coil structure, adjusts the size of the inner coil of the coil structure, and adjusts the distribution of the magnetic field strength of the wireless charging coil. Based on the fact that the maximum size of the coil structure in the first direction and the second direction according to the present application is the same as the size of the coil in the related art, the present application adjusts the distribution position of the hollow region in the first direction, the trace design of the first coil portion of the wireless charging coil is more dense, the magnetic field at the second coil portion is more concentrated in the inner coil of the coil structure, and the magnetic field at the first coil portion is more concentrated in the middle region of the first coil portion in the first direction. Therefore, compared with the wireless charging coil in the related art, the present application increases the equivalent height of the wireless charging coil in the first direction (i.e., increases the height from the center of the wireless charging coil to the bottom of the electronic device in the first direction). Therefore, after the electronic device is placed on the charging base, the distance from the center of the coil of the charging base to the center of the wireless charging coil in the first direction can be reduced, the area of the region of the hollow region of the coil of the charging base that is shielded by the coil structure of the wireless charging coil can be reduced, and the area of the region of the hollow region of the wireless charging coil that is shielded by the coil of the charging base can be reduced. This is beneficial to improving the wireless charging efficiency of the electronic device and shortening the wireless charging time of the electronic device.

[0013] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0015] Figure 1 is a structural diagram of a coil of a charging base and a wireless charging coil in the related art;

[0016] Figure 2 is a structural diagram of a wireless charging module in the related art;

[0017] Figure 3 is a structural diagram of a shielding layer and a flexible circuit board in the related art;

[0018] Figure 4 is a magnetic field intensity distribution diagram of a wireless charging coil in the related art;

[0019] Figure 5 is a structural diagram of a wireless charging coil and a flexible circuit board of one embodiment of the present application;

[0020] Figure 6 is a structural diagram of a coil of a charging base and a wireless charging coil of one embodiment of the present application;

[0021] Figure 7 is an exploded view of a wireless charging module of one embodiment of the present application;

[0022] Figure 8 is a structural diagram of a wireless charging module of one embodiment of the present application;

[0023] Figure 9 is a magnetic field intensity distribution diagram of a wireless charging coil of one embodiment of the present application;

[0024] Figure 10 is a curve diagram showing a change in a coupling value k of a transceiving coil of the present application and the related art with a change in a first direction offset distance;

[0025] Figure 11 is a structural diagram of an electronic device of one embodiment of the present application.

[0026] Correspondence between reference numerals in the drawings and component names:

[0027] Figures 1 to 4 Correspondence between reference numerals in the drawings and component names in FIG. 1 is as follows:

[0028] 10' wireless charging coil, 100' hollow area, 240' base copper, 250' plated copper, 30' wireless charging module, 300' cover layer, 400' shielding layer, 500' flexible circuit board, 600' protective layer, 700' support layer, 80' coil of a charging base, 800' hollow portion.

[0029] Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 11 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0030] 10 Wireless charging coil, 100 Hollow area, 200 Coil structure, 210 First coil section, 220 Second coil section, 230 Wiring, 240 Base copper, 250 Copper plating, 232 Coil, 260 Third coil section, 270 Wiring group, 30 Wireless charging module, 300 Covering layer, 400 Shielding layer, 410 Hollow area, 500 Flexible circuit board, 600 Protective layer, 700 Support layer, 80 Coil of charging base, 800 Hollow section, 90 Electronic device, 900 Camera module. Detailed Implementation

[0031] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element 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 of this application.

[0034] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The accompanying drawings are described below Figures 5 to 11 The wireless charging coil 10, the wireless charging module 30 and the electronic equipment provided by the embodiments of the present application are described.

[0036] As Figure 5 As shown, according to some embodiments of the present application, a wireless charging coil 10 is provided, comprising: a hollow area 100; a coil structure 200, the coil structure 200 is arranged around the hollow area 100; the coil structure 200 has a first coil part 210 and a second coil part 220, along a first direction, the hollow area 100 is located between the first coil part 210 and the second coil part 220; the first coil part 210 and the second coil part 220 each comprise a plurality of wire groups 270, the plurality of wire groups 270 are arranged along the first direction; along the first direction, the width of the first coil part 210 is less than the width of the second coil part 220, and the width of the plurality of wire groups 270 of the second coil part 220 gradually decreases.

[0037] In the embodiments of the present application, the wireless charging coil 10 comprises a hollow area 100 and a coil structure 200. The coil structure 200 is arranged around the hollow area 100.

[0038] The coil structure 200 is regionally divided, so that the coil structure 200 has a first coil part 210 and a second coil part 220. Along a first direction, the hollow area 100 is located between the first coil part 210 and the second coil part 220. That is, the first coil part 210 and the second coil part 220 are oppositely and spacedly arranged in the first direction.

[0039] The size and structure of the first coil part 210 and the second coil part 220 are limited. Along the first direction, the width of the first coil part 210 is less than the width of the second coil part 220. The first coil part 210 comprises a plurality of wire groups 270, and the second coil part 220 comprises a plurality of wire groups 270, the plurality of wire groups 270 of the first coil part 210 are arranged along the first direction, and the plurality of wire groups 270 of the second coil part 220 are arranged along the first direction. Among them, along the first direction, the width of the plurality of wire groups 270 of the second coil part 220 gradually decreases.

[0040] This design optimizes the wiring 230 of the coil structure 200, adjusts the size of the inner ring of the coil structure 200, and adjusts the distribution of the magnetic field strength of the wireless charging coil 10. Based on the fact that the maximum size of the coil structure 200 in the first and second directions is the same as the size of the coil in the related art, this application adjusts the distribution position of the hollow region 100 in the first direction. The wiring 230 of the first coil portion 210 of the wireless charging coil 10 is designed to be more densely packed, the magnetic field at the second coil portion 220 is more concentrated in the inner ring of the coil structure 200, and the magnetic field at the first coil portion 210 is more concentrated in the central region of the first coil portion 210 in the first direction. Thus, compared to the wireless charging coil 10' in the related art, this application increases the equivalent height of the wireless charging coil 10 in the first direction (i.e., along the first direction, the height from the center of the wireless charging coil 10 to the bottom of the electronic device is increased). In this way, when the electronic device is placed on the charging dock, the distance between the center of the charging dock's coil 80 and the center of the wireless charging coil 10 can be reduced along the first direction. This reduces the area of ​​the hollow region 100 of the charging dock that is blocked by the coil structure 200 of the wireless charging coil 10, thereby improving the wireless charging efficiency of the electronic device and shortening the wireless charging time.

[0041] For example, the length of the hollow region 100 in the first direction is greater than the length of the hollow region 100 in the second direction.

[0042] For example, the first direction is perpendicular to the second direction.

[0043] For example, the angle between the orthographic projections of the first direction and the second direction onto the preset plane is an acute angle.

[0044] For example, the angle between the orthographic projections of the first direction and the second direction onto the preset plane is an obtuse angle.

[0045] For example, multiple wiring groups 270 are connected in series.

[0046] like Figure 5 As shown, along the first direction, the maximum length of the outer coil of the coil structure 200 in the first direction is d. The width of the first coil portion 210 is t5. Along the first direction, the width of the second coil portion 220 is t6.

[0047] In some embodiments, each wiring group 270 includes at least one wiring strand 230, and each wiring strand 230 includes at least one turn of coil 232; when the wiring group 270 includes multiple wiring strands 230, the multiple wiring strands 230 are arranged along a first direction; when the wiring strands 230 include multiple turns of coil 232, the multiple turns of coil 232 are arranged along a first direction.

[0048] In this embodiment, the structure of the wire groups 270 is further defined.

[0049] Specifically, each wire group 270 includes at least one strand of wire 230.

[0050] Specifically, each strand of wire 230 includes at least one turn of coil 232.

[0051] When the wire group 270 includes multiple strands of wire 230, the multiple strands of wire 230 are arranged along the first direction.

[0052] When the wire 230 includes multiple turns of coil 232, the multiple turns of coil 232 are arranged along the first direction.

[0053] Exemplarily, the multiple turns of coil 232 of the wire 230 are connected in parallel.

[0054] Exemplarily, when each wire group 270 includes one strand of wire 230, and each strand of wire 230 includes one turn of coil 232, along the first direction, the width of the coil 232 of the multiple strands of wire 230 gradually decreases.

[0055] In some embodiments, in the second coil part 220, when the number of wires 230 of the two adjacent wire groups 270 is the same, the width of the wire 230 of the wire group 270 located on the outer side is greater than the width of the wire 230 of the wire group 270 located on the inner side.

[0056] In this embodiment, the matching structure of the multiple wire groups 270 of the second coil part 220 is defined.

[0057] In the second coil part 220, when the number of wires 230 of the two adjacent wire groups 270 is the same, the width of the wire 230 of the wire group 270 located on the outer side is greater than the width of the wire 230 of the wire group 270 located on the inner side.

[0058] This arrangement can meet the use requirement that the width of the multiple wire groups 270 of the second coil part 220 gradually decreases along the first direction.

[0059] Exemplarily, in the second coil part 220, the two adjacent wire groups 270 each include three strands of wire, and along the first direction, the width of the wire 230 of the wire group 270 located on the outer side is greater than the width of the wire 230 of the wire group 270 located on the inner side.

[0060] Exemplarily, in the second coil part 220, the two adjacent wire groups 270 each include two strands of wire, and along the first direction, the width of the wire 230 of the wire group 270 located on the outer side is greater than the width of the wire 230 of the wire group 270 located on the inner side.

[0061] In some embodiments, the number of wires 230 in the wire group 270 on the outer side is greater than the number of wires 230 in the wire group 270 on the inner side in the two adjacent wire groups 270 of the second coil portion 220.

[0062] In this embodiment, the cooperation structure of the plurality of wire groups 270 of the second coil portion 220 is defined.

[0063] The number of wires 230 in the wire group 270 on the outer side is greater than the number of wires 230 in the wire group 270 on the inner side in the two adjacent wire groups 270 of the second coil portion 220.

[0064] This arrangement can meet the use requirement that the width of the plurality of wire groups 270 of the second coil portion 220 gradually decreases along the first direction.

[0065] Illustratively, the wire group 270 on the outer side is referred to as a first wire group and the wire group 270 on the inner side is referred to as a second wire group in the two adjacent wire groups 270 of the second coil portion 220. The first wire group includes three wires and the second wire group includes two wires.

[0066] Illustratively, the wire group 270 on the outer side is referred to as a first wire group and the wire group 270 on the inner side is referred to as a second wire group in the two adjacent wire groups 270 of the second coil portion 220. The first wire group includes four wires and the second wire group includes three wires.

[0067] In some embodiments, the width of the wire 230 on the outer side is greater than the width of the wire 230 on the inner side in the wire group 270.

[0068] In this embodiment, the cooperation structure of the plurality of wire groups 270 of the second coil portion 220 is defined.

[0069] The number of wires 230 in the wire group 270 on the outer side is greater than the number of wires 230 in the wire group 270 on the inner side in the two adjacent wire groups 270 of the second coil portion 220. The width of the wire 230 on the outer side is greater than the width of the wire 230 on the inner side in the wire group 270.

[0070] This arrangement can meet the use requirement that the width of the plurality of wire groups 270 of the second coil portion 220 gradually decreases along the first direction.

[0071] In some embodiments, when each wire group 270 includes one wire 230 in the second coil portion 220, the number of coils 232 of the two adjacent wires is the same. The width of the coil 232 of the wire 230 on the outer side is greater than the width of the coil 232 of the wire 230 on the inner side.

[0072] In this embodiment, the cooperation structure of the plurality of wire groups 270 defining the second coil portion 220 is defined.

[0073] When each wire group 270 includes one wire 230, the number of coils 232 of the wire 230 located at the outer side is greater than the number of coils 232 of the wire 230 located at the inner side.

[0074] This arrangement can meet the requirement that the width of the plurality of wire groups 270 of the second coil portion 220 gradually decreases along the first direction.

[0075] Illustratively, in the second coil portion 220, each of the adjacent two wires includes one coil 232, and the width of the coil 232 of the wire 230 located at the outer side is greater than the width of the coil 232 of the wire 230 located at the inner side along the first direction.

[0076] Illustratively, in the second coil portion 220, each of the adjacent two wires includes three coils, the wire 230 located at the outer side is referred to as a first wire, and the wire 230 located at the inner side is referred to as a second wire. The widths of the three coils of the first wire are equal along the first direction, and the widths of the three coils of the second wire are equal along the first direction. The width of the coil 232 of the first wire is greater than the width of the coil 232 of the second wire along the first direction.

[0077] In some embodiments, in the second coil portion 220, when each wire group 270 includes one wire 230, the number of coils 232 of the wire 230 located at the outer side is greater than the number of coils 232 of the wire 230 located at the inner side in the adjacent two wires.

[0078] In this embodiment, the cooperation structure of the plurality of wire groups 270 defining the second coil portion 220 is defined.

[0079] In the second coil portion 220, when each wire group 270 includes one wire 230, the number of coils 232 of the wire 230 located at the outer side is greater than the number of coils 232 of the wire 230 located at the inner side in the adjacent two wires.

[0080] This arrangement can meet the requirement that the width of the plurality of wire groups 270 of the second coil portion 220 gradually decreases along the first direction.

[0081] Illustratively, in the second coil portion 220, the wire 230 located at the outer side in the adjacent two wires is referred to as a first wire, and the wire 230 located at the inner side is referred to as a second wire. The first wire includes three coils, and the second wire includes two coils.

[0082] Exemplarily, in the second coil portion 220, the wire 230 on the outer side is referred to as a first wire, and the wire 230 on the inner side is referred to as a second wire. The first wire includes four turns of coils 232, and the second wire includes three turns of coils.

[0083] In some embodiments, the width of the coil 232 of the wire 230 on the outer side is equal to the width of the coil 232 of the wire 230 on the inner side.

[0084] In this embodiment, the cooperation structure of the plurality of wire groups 270 of the second coil portion 220 is defined.

[0085] In the second coil portion 220, when each wire group 270 includes one wire 230, in the adjacent two wires 230, the number of coils 232 of the wire 230 on the outer side is greater than the number of coils 232 of the wire 230 on the inner side. The width of the coil 232 of the wire 230 on the outer side is equal to the width of the coil 232 of the wire 230 on the inner side.

[0086] That is, by increasing the number of coils 232 of the wire 230 on the outer side, the use requirement that the width of the plurality of wire groups 270 of the second coil portion 220 gradually decreases along the first direction is met.

[0087] In other embodiments, in the second coil portion 220, when each wire group 270 includes one wire 230, in the adjacent two wires 230, the number of coils 232 of the wire 230 on the outer side is greater than the number of coils 232 of the wire 230 on the inner side. The width of the coil 232 of the wire 230 on the outer side is greater than the width of the coil 232 of the wire 230 on the inner side.

[0088] In other embodiments, in the second coil portion 220, when each wire group 270 includes one wire 230, in the adjacent two wires 230, the number of coils 232 of the wire 230 on the outer side is greater than the number of coils 232 of the wire 230 on the inner side. The width of the coil 232 of the wire 230 on the outer side is less than the width of the coil 232 of the wire 230 on the inner side. That is, even if the width of the coil 232 of the wire 230 on the outer side is less than the width of the coil 232 of the wire 230 on the inner side, the total width of the coil 232 of the wire 230 on the outer side is greater than the total width of the coil 232 of the wire 230 on the inner side along the first direction.

[0089] In some embodiments, the width of the plurality of wire groups 270 of the first coil portion 210 along the first direction is equal.

[0090] In this embodiment, the cooperation structure of the plurality of wire groups 270 of the first coil portion 210 is defined.

[0091] In the first direction, the width of any two wire groups 270 in the first coil part 210 is equal. This arrangement can simplify the processing difficulty of the first coil part 210, and is conducive to improving the processing efficiency of the wireless charging coil 10, while meeting the use requirement that the width of the first coil part 210 is less than the width of the second coil part 220 in the first direction.

[0092] Exemplarily, each wire group 270 in the first coil part 210 includes a group of wires 230.

[0093] Exemplarily, in the two adjacent wire groups 270 of the first coil part 210, the wire group 270 located on the outer side is recorded as the first wire group, and the wire group 270 located on the inner side is recorded as the second wire group. The number of wires 230 of the first wire group is equal to the number of wires 230 of the second wire group.

[0094] Exemplarily, in the two adjacent wire groups 270 of the first coil part 210, the wire group 270 located on the outer side is recorded as the first wire group, and the wire group 270 located on the inner side is recorded as the second wire group. The number of wires 230 of the first wire group is not equal to the number of wires 230 of the second wire group, and the width of the wire 230 of the first wire group is not equal to the width of the wire 230 of the second wire group, so as to meet the equal width of the plurality of wire groups 270 of the first coil part 210.

[0095] In some embodiments, the maximum length of the outer coil of the coil structure 200 in the first direction is d; the part of the coil structure 200 between the first coil part 210 and the second coil part 220 includes two third coil parts 260; in the second direction, the hollow area 100 is located between the two third coil parts 260; in the first direction, the height of the position where the end face of the third coil part 260 away from the first coil part 210 is d / 2; in the first direction, the distance between the two third coil parts 260 gradually decreases; or in the first direction, the distance between the two third coil parts 260 first decreases and then is equal; or in the first direction, the distance between the two third coil parts 260 is equal.

[0096] In this embodiment, the coil structure 200 also has two third coil parts 260, and each third coil part 260 is located between the first coil part 210 and the second coil part 220.

[0097] In the second direction, the hollow area 100 is located between the two third coil parts 260. That is, in the second direction, the two third coil parts 260 are oppositely and spacedly arranged.

[0098] The maximum length of the outer coil of the coil structure 200 in the first direction is d. In the first direction, the height of the position where the third coil portion 260 is away from the end face of the first coil portion 210 is d / 2.

[0099] In the first direction, the distance between the two third coil portions 260 gradually decreases. Alternatively, in the first direction, the distance between the two third coil portions 260 first decreases and then is equal. Alternatively, in the first direction, the distance between the two third coil portions 260 is equal.

[0100] This arrangement further limits the shape of the hollow area 100, so that even if the camera module of the electronic device occupies the position of the wireless charging coil 10 in the first direction, the shape of the hollow area 100 of the wireless charging coil 10 can still be adapted to the shape of the hollow part 800 of the charging base. In this way, the area covered by the hollow area 100 of the wireless charging coil 10 and the area covered by the hollow part 800 of the charging base can be further reduced, which is beneficial to improving the wireless charging efficiency of the electronic device.

[0101] As shown in Figure 5 , the distance between the two third coil portions 260 away from the end face of the first coil portion 210 is t1. In the first direction, the distance between the portions of the two third coil portions 260 with a position height greater than d / 2 is t2. Wherein, 0.8≤t2 / t1≤1. Exemplarily, t2 / t1=0.85, t2 / t1=0.88, t2 / t1=0.9, t2 / t1=0.92, t2 / t1=0.95, and t2 / t1=0.97, etc., which are not listed one by one here.

[0102] As shown in Figure 7 and Figure 8 , according to some embodiments of the present application, the wireless charging module 30 comprises the wireless charging coil 10 according to any one of the above embodiments.

[0103] The wireless charging module 30 provided by the present application has all the beneficial effects of the wireless charging coil 10 described above, and is not repeated here.

[0104] In some embodiments, as shown in Figure 7 and Figure 8 , the wireless charging module 30 further comprises a cover layer 300, a support layer 700, the wireless charging coil 10 is located between the cover layer 300 and the support layer 700, a shielding layer 400 is arranged on the side of the support layer 700 away from the cover layer 300, the shielding layer 400 is provided with a hollow area 410, a flexible circuit board 500, a part of the flexible circuit board 500 is arranged in the hollow area 410, and a protective layer 600 is arranged on the side of the shielding layer 400 away from the support layer 700.

[0105] In this embodiment, the wireless charging module 30 further includes a cover layer 300, a support layer 700, a shielding layer 400, a flexible circuit board 500, and a protective layer 600.

[0106] The cover layer 300, the wireless charging coil 10, the support layer 700, the shielding layer 400 and the protective layer 600 are stacked in sequence.

[0107] The shielding layer 400 has a cutout area 410, and a portion of the flexible circuit board 500 is located in the cutout area 410. That is, a portion of the flexible circuit board 500 is embedded in the cutout area 410.

[0108] In related technologies, such as Figure 2 As shown, the wireless charging module 30' includes two wireless charging coils 10', two cover layers 300', two support layers 700', a shielding layer 400', and a protective layer 600'. Compared to the wireless charging module 30' of the prior art, this application replaces the double-layer wireless charging coil with a single-layer wireless charging coil and eliminates one cover layer 300 and one support layer 700, reducing the material input and thickness of the wireless charging module 30. In other words, this application improves the structure of the wireless charging module 30. Compared to the wireless charging module of the prior art, with the same module thickness, a thicker trace 230 can be used to achieve lower impedance, resulting in better performance for the wireless charging module 30. In other words, this application improves the structure of the wireless charging module 30, and compared to the wireless charging module 30' of the prior art, can reduce the thickness of the wireless charging module 30 while maintaining the same performance requirements.

[0109] like Figure 11 As shown, in some embodiments of this application, the electronic device 90 includes: a camera module 900; and a wireless charging module 30 of any of the above embodiments, wherein the first coil portion 210 is located between the second coil portion 220 and the camera module 900.

[0110] In related technologies, such as Figure 1 As shown, the electronic device includes a wireless charging module 30', which includes a wireless charging coil 10'. When the electronic device is placed on a charging dock, the coil 80' of the charging dock and the wireless charging coil 10' of the electronic device cooperate to wirelessly charge the electronic device.

[0111] With the increasing demand for image of electronic devices, the camera module design of electronic devices is getting larger and larger, which occupies the installation area of the wireless charging module 30', resulting in that the distance from the center of the wireless charging coil 10' to the bottom of the electronic device along the Y direction is getting smaller and smaller. Along the Y direction, the distance between the center of the coil 80' of the charging seat and the center of the wireless charging coil 10' of the electronic device increases. When the electronic device is wirelessly charged, the hollow part 800' of the coil 80' of the charging seat is blocked by the coil structure of the electronic device in a larger area, and at the same time, the hollow area 100' of the wireless charging coil 10' of the electronic device is blocked by the coil 80' of the charging seat in a larger area, resulting in low charging efficiency of the electronic device and long charging time.

[0112] In the present application, the electronic device 90 includes a camera module 900 and a wireless charging module 30, and the first coil part 210 is located between the second coil part 220 and the camera module 900. That is, the first coil part 210 is closer to the camera module 900 than the second coil part 220.

[0113] The wireless charging module 30 includes a wireless charging coil 10. The wireless charging coil 10 includes a hollow area 100 and a coil structure 200. The coil structure 200 is arranged around the hollow area 100.

[0114] The coil structure 200 is regionally divided, so that the coil structure 200 has a first coil part 210 and a second coil part 220. Along the first direction, the hollow area 100 is located between the first coil part 210 and the second coil part 220. That is, the first coil part 210 and the second coil part 220 are oppositely and spacedly arranged in the first direction.

[0115] The size and structure of the first coil part 210 and the second coil part 220 are limited. Along the first direction, the width of the first coil part 210 is smaller than the width of the second coil part 220. The first coil part 210 includes a plurality of wire groups 270, and the second coil part 220 includes a plurality of wire groups 270. The plurality of wire groups 270 of the first coil part 210 are arranged along the first direction, and the plurality of wire groups 270 of the second coil part 220 are arranged along the first direction. Among them, along the first direction, the width of the plurality of wire groups 270 of the second coil part 220 gradually decreases.

[0116] The arrangement optimizes the wire 230 of the coil structure 200, adjusts the size of the inner coil of the coil structure 200, and adjusts the distribution of the magnetic field strength of the wireless charging coil 10. Based on the maximum size of the coil structure 200 in the first direction and the second direction being the same as that of the coil in the related art, the present application adjusts the distribution position of the hollow area 100 in the first direction, the wire 230 of the first coil part 210 of the wireless charging coil 10 is designed to be more dense, the magnetic field at the second coil part 220 is more concentrated on the inner coil of the coil structure 200, and the magnetic field at the first coil part 210 is more concentrated on the middle area of the first coil part 210 in the first direction. Thus, compared with the wireless charging coil 10' in the related art, the present application improves the equivalent height of the wireless charging coil 10 in the first direction (i.e., increases the height from the center of the wireless charging coil 10 to the bottom of the electronic device along the first direction). Thus, after the electronic device is placed on the charging base, the distance from the center of the coil 80 of the charging base to the center of the wireless charging coil 10 can be reduced along the first direction, the area of the hollow area 100 of the coil 80 of the charging base blocked by the coil structure 200 of the wireless charging coil 10 can be reduced, and the area of the hollow area 100 of the wireless charging coil 10 blocked by the coil 80 of the charging base can be reduced, which is beneficial to improving the wireless charging efficiency of the electronic device and shortening the wireless charging time of the electronic device.

[0117] It can be understood that the first direction is the Y direction.

[0118] Exemplarily, the wireless charging coil 10 of the wireless charging module 30 of the present application is a single-layer structure, which is beneficial to reducing the overall thickness of the wireless charging module 30. The present application optimizes the wire 230 of the wireless charging coil 10, increases the size of the inner coil of the wireless charging coil 10 in the first direction, and improves the equivalent height of the wireless charging coil 10.

[0119] Exemplarily, as shown in Figure 5 , the wire 230 of the first coil part 210 at the uppermost end of the first direction is designed to be more dense without changing the maximum size of the wireless charging coil 10 in the first direction and the second direction.

[0120] Exemplarily, as shown in Figure 5 , the width of the first coil part 210 along the first direction is t5. Exemplarily, t5 = 6.4 mm.

[0121] For example, the first coil section 210 includes a plurality of wiring groups 270. The plurality of wiring groups 270 are arranged along a first direction. Each wiring group 270 includes a single wire 230, each wire 230 includes a multi-turn coil 232, the multi-turn coils 232 of each wire 230 are connected in parallel, and the plurality of wires 230 are connected in series. Along the first direction, the width of the multi-turn coils 232 of each wire 230 is the same.

[0122] For example, such as Figure 5 As shown, along the first direction, the width of the second coil portion 220 located at the lower end is t6. For example, t6 = 11.3 mm.

[0123] For example, the second coil section 220 includes a plurality of wiring groups 270. The plurality of wiring groups 270 are arranged along a first direction. Each wiring group 270 includes a single wire 230, each wire 230 includes a multi-turn coil 232, the multi-turn coils 232 of each wire 230 are connected in parallel, and the plurality of wires 230 are connected in series. Along the first direction, the width of the multi-turn coil 232 of each wire 230 gradually decreases from the outer turn to the inner turn.

[0124] For example, such as Figure 5 As shown, the size of the inner coil of the wireless charging coil 10 is adjusted. The maximum length of the outer coil of the coil structure 200 in the first direction is d. Along the first direction, starting from a position height of d / 2 upwards, the distance between the two third coil portions 260 gradually decreases. For example, d = 48 mm.

[0125] like Figure 5 As shown, the distance between the end faces of the two third coil portions 260 away from the first coil portion 210 is t1. That is, along the second direction, the maximum width of the inner coil of the coil structure 200 is t1. For example, t1 = 25 mm. Along the first direction, the distance between the two third coil portions 260 gradually decreases to 24.4 mm. The maximum length of the inner coil of the coil structure 200 in the first direction is t3, for example, t3 = 30 mm. The maximum length of the outer coil of the coil structure 200 in the second direction is t4.

[0126] It is understandable that when the transceiver coils are wirelessly coupled, the larger the area of ​​the hollow part 800 of the coil 232 that is partially blocked by the wiring 230, the lower the charging efficiency.

[0127] like Figure 1 As shown, along the first direction, the wireless charging coil 10' in the related art is offset by 5mm relative to the coil 80' of the charging dock (e.g., a vehicle-mounted wireless transmitting coil). Figure 6 As shown, along the first direction, the wireless charging coil 10 of this application is offset by 5mm relative to the coil 80 of the charging dock. Figure 6It can be seen that the hollow area 100 of the wireless charging coil 10 is almost not blocked by the coil 80 of the charging base, and the hollow part 800 of the coil 80 of the charging base is almost not blocked by the wireless charging coil 10.

[0128] When the wireless charging module 30 of the present application works, the magnetic field at the second coil part 220 is more concentrated in the inner ring of the coil structure 200, and the magnetic field at the first coil part 210 is more concentrated in the middle area of the first coil part 210 in the first direction. Figure 4 The magnetic field intensity distribution of the wireless charging coil 10' in the related art is shown, Figure 9 The magnetic field intensity distribution of the wireless charging coil 10 of the present application is shown.

[0129] As shown in Figure 4 , the magnetic field intensity gradually increases from the center of the wireless charging coil 10 to the outside. In the first direction, the equivalent height of the wireless charging coil 10 is the center height of the wireless charging coil 10, and the equivalent height is 24mm.

[0130] As shown in Figure 9 , the structure of the wireless charging coil 10 of the present application is reasonably set, and the distribution of the magnetic field intensity is adjusted. The equivalent height of the wireless charging coil 10 is 29mm.

[0131] As shown in Figure 4 and Figure 9 , the maximum length of the wireless charging coil 10 in the first direction is 48mm, and the maximum length of the wireless charging coil 10 in the second direction is 48mm. In the first direction, the equivalent height of the wireless charging coil 10 of the present application is improved by 5mm compared with the wireless charging coil 10' in the related art.

[0132] When the wireless charging module 30 of the present application works, the magnetic field center will be offset to the upper narrow wire 230 area. In the first direction, the width of the first coil part 210 is smaller than the width of the second coil part 220, and the width of the plurality of wire groups 270 of the second coil part 220 gradually decreases, which can improve the equivalent height of the wireless charging module 30 in the first direction.

[0133] For example, the second coil portion 220 includes three wiring groups 270, which are referred to as the first wiring group, the second wiring group, and the third wiring group along the first direction. The first wiring group includes three strands of wire, the second wiring group includes three strands of wire, and the third wiring group includes two strands of wire. Along the first direction, the widths of the three strands of wire in the first wiring group are equal, the widths of the three strands of wire in the second wiring group are equal, and the widths of the two strands of wire in the third wiring group are equal. The width of the wire 230 in the second wiring group is smaller than the width of the wire 230 in the first wiring group, and the width of the wire 230 in the second wiring group is larger than the width of the wire 230 in the third wiring group. The strongest magnetic field region of the second coil portion 220 of the wireless charging coil 10 will still be biased towards the inner ring of the coil structure 200, and the magnetic field center of the wireless charging coil 10 will shift upward, thereby increasing the equivalent height in the first direction.

[0134] For example, the second coil section 220 includes eight wiring groups 270, each wiring group 270 including one wiring strand 230. It is understood that the second coil section 220 includes eight wiring strands 230 connected in series. The outermost wiring strand 230 includes three turns of coil 232 connected in parallel. The innermost wiring strand 230 includes one turn of coil 232. The remaining six wiring strands 230 each include two turns of coil 232 connected in parallel. That is, the second coil section 220 includes 16 turns of coil 232. The width gradually narrows from the outermost wiring strand 230 to the innermost wiring strand 230, which can increase the equivalent height in the first direction. Furthermore, this arrangement allows for more flexible adjustment of the overall inductance and impedance of the wireless charging module 30.

[0135] It is understandable that the charging performance of the wireless charging module 30 is related to the coupling value of the transceiver coil. In related technologies, due to the influence of the camera module of an electronic device, the distance from the center of the wireless charging module 30' to the bottom of the electronic device along the first direction is 65mm. However, in a charging dock (e.g., a car wireless charging dock), the distance from the center of the coil 80' of the charging dock to the bottom of the charging dock along the first direction is 72mm. Figure 10 As shown, when the wireless charging coil 10' of the electronic device in the related technology (i.e., the distance from the center of the wireless charging module 30' to the bottom of the electronic device along the first direction is 65mm) is used with a charging stand (the distance from the center of the coil 80' of the charging stand to the bottom of the charging stand along the first direction is 72mm), the wireless charging module 30' of the electronic device is at risk of disconnection at any time. When the electronic device of this application is used with a charging stand (the distance from the center of the coil 80' of the charging stand to the bottom of the charging stand along the first direction is 72mm), it can meet the coupling conditions for normal fast charging, and significantly improves the charging experience of third-party wireless charging accessories (i.e., charging stands), especially in-vehicle wireless charging stands.

[0136] Exemplarily, the application reasonably provides the matching structure of the wireless charging module 30, which is beneficial to improve the thickness of the wireless charging coil 10 and optimize the impedance of the wireless charging module 30.

[0137] In the related art, as shown in Figure 2 and Figure 3 , the wireless charging module 30' includes a double-layer wireless charging coil. From top to bottom, the wireless charging module 30' includes a cover layer 300', a wireless charging coil 10', a support layer 700', a wireless charging coil 10', a cover layer 300', a support layer 700', a shielding layer 400' and a protective layer 600'.

[0138] In the application, as shown in Figure 7 and Figure 8 , the wireless charging module 30 includes a cover layer 300 (such as a CVL (cover lay) layer), a wireless charging coil 10 (such as the wireless charging coil 10 including a base copper 240 and a plated copper 250), a support layer 700 (such as a polyimide film), a shielding layer 400 (such as a nanocrystalline shielding sheet) and a protective layer 600 (such as a polyethylene terephthalate layer). Compared with the related art, the wireless charging coil 10 in the application is a single-layer structure, and the wireless charging coil 10 has only one jumper connecting the inner and outer circles of the coil 232. The jumper area of the nanocrystalline shielding sheet is provided with a hollow area 410, and the jumper part and the nanocrystalline shielding sheet are inlaid and stacked into one layer. The application cancels one cover layer 300 and one support layer 700, and the support layer 700 and the shielding layer 400 are adhered by laminated glue, thereby reducing the thickness of the wireless charging module 30 by 0.02 mm. That is, the application improves the structure of the wireless charging module 30, and compared with the wireless charging module 30' in the related art, under the condition of the same module thickness, a thicker wire 230 can be used to design a lower impedance, so that the wireless charging module 30 has better performance.

[0139] Exemplarily, in the application, the maximum length of the wireless charging coil 10 in the first direction is 48 mm, and the maximum length of the wireless charging coil 10 in the second direction is 48 mm. Along the first direction, the height from the center of the wireless charging module 30 to the bottom of the electronic device is 65 mm. Along the first direction, the equivalent height of the wireless charging coil 10 is 69 mm. The wireless charging coil 10 is in the shape of "D". Along the first direction, the width (such as 6.4 mm) of the first coil part 210 is smaller than the width (such as 11.3 mm) of the second coil part 220, and the width of the plurality of wire groups 270 of the second coil part 220 gradually decreases. The maximum length of the inner circle of the wireless charging coil 10 in the second direction is 25 mm. Along the first direction, from the position with a height of 25 mm upwards, the length of the inner circle of the wireless charging coil 10 in the second direction narrows to 24.4 mm. As shown inFigure 8 As shown, the wireless charging module 30 includes a cover layer 300, a wireless charging coil 10, a support layer 700, a flexible circuit board 500, a shielding layer 400, and a protection layer 600. In the direction from the cover layer 300 to the protection layer 600, the thickness of the wireless charging module 30 is 0.16 mm, and the thickness of the wireless charging coil 10 (e.g., the wire 230 copper) is 50 um (e.g., the thickness of the base copper 240 is 35 um, and the thickness of the plated copper 250 is 15 um). The application improves the structure of the wireless charging module 30, and compared with the related art wireless charging module 30', the thickness can be reduced by 0.18 mm under the same performance.

[0140] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0141] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A wireless charging coil, characterized by, Comprising: a hollow region; a coil structure, the coil structure being disposed around the hollow region; the coil structure having a first coil portion and a second coil portion, the hollow region being located between the first coil portion and the second coil portion along a first direction; the first coil portion and the second coil portion each comprising a plurality of wire groups, the plurality of wire groups being arranged along the first direction; along the first direction, a width of the first coil portion is less than a width of the second coil portion, and a width of the plurality of wire groups of the second coil portion gradually decreases; each wire group comprising at least one wire, each wire comprising at least one turn; when the wire group comprises a plurality of wires, the plurality of wires are arranged along the first direction; when the wire comprises a plurality of turns, the plurality of turns are arranged along the first direction; of two adjacent wire groups of the second coil portion, a wire group located at an outer side has a number of wires greater than a number of wires of a wire group located at an inner side.

2. The wireless charging coil of claim 1, wherein, a width of a wire of the wire group located at the outer side is greater than a width of a wire of the wire group located at the inner side.

3. The wireless charging coil of claim 1 or 2, wherein, along the first direction, the width of the plurality of wire groups of the first coil portion is equal.

4. The wireless charging coil of claim 1 or 2, wherein, a maximum length of an outer coil of the coil structure along the first direction is d; a portion of the coil structure between the first coil portion and the second coil portion comprises two third coil portions; along a second direction, the hollow region is located between the two third coil portions; along the first direction, a height of a position where an end surface of the third coil portion faces away from the first coil portion is d / 2; along the first direction, a distance between the two third coil portions gradually decreases; or along the first direction, the distance between the two third coil portions first decreases and then is equal; or along the first direction, the distance between the two third coil portions is equal.

5. A wireless charging module, comprising: Comprising: the wireless charging coil of any one of claims 1 to 4.

6. The wireless charging module of claim 5, wherein, Further comprising: a cover layer; a support layer, the wireless charging coil being located between the cover layer and the support layer; a shielding layer, the shielding layer being provided on a side of the support layer facing away from the cover layer, the shielding layer being provided with a hollow region; a flexible circuit board, a portion of the flexible circuit board being provided in the hollow region; a protection layer, the protection layer being provided on a side of the shielding layer facing away from the support layer.

7. An electronic device, comprising: Comprising: a camera module; and the wireless charging module of claim 5 or 6, the first coil portion being located between the second coil portion and the camera module. ​

Images