WO2022095172A1

WO2022095172A1 - Wireless charging fpc coil structure

Info

Publication number: WO2022095172A1
Application number: PCT/CN2020/132575
Authority: WO
Inventors: 刘毛; 吕洪辉; 王红军; 周礼义
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声精密制造科技(常州)有限公司
Priority date: 2020-11-03
Filing date: 2020-11-30
Publication date: 2022-05-12
Also published as: CN213905105U

Abstract

A wireless charging FPC coil structure. The wireless charging FPC coil structure (100) comprises: an insulating medium (230), two opposite surfaces of the insulating medium (230) being a first winding plane (210) and a second winding plane (220); a first coil (110), the first coil (110) comprising a first upper coil (111) wound into an inner ring layer by layer from an outer ring on the first winding plane (210) and a first lower coil (112) wound into the inner ring layer by layer from the outer ring on the second winding plane (220), and the first lower coil (112) being arranged in an orthographic projection area of the first upper coil (111); a second coil (120), the second coil (120) comprising a second upper coil (121) wound from the inner ring to the outer ring layer by layer on the first winding plane (210) and a second lower coil (122) wound from the inner ring to the outer ring layer by layer on the second winding plane (220), and the second lower coil (122) being arranged in an orthographic projection area of the second upper coil (121); and leads (130), wherein the first upper coil (111), the first lower coil (112), the second upper coil (121) and the second lower coil (122) each comprise two leads. The FPC coil is convenient to wind, has a simple process flow and is thin, thereby effectively reducing the internal resistance of the FPC coil, reducing the cost, and improving the charging efficiency of the FPC coil.

Description

A wireless charging FPC coil structure

technical field

The utility model relates to the technical field of wireless charging, in particular to a wireless charging FPC coil structure.

Background technique

With the rapid development of wireless charging technology in recent years, wireless charging functions are increasingly integrated into terminal devices, including mobile phones, watches, TWS Bluetooth headsets, electric toothbrushes, etc. The wireless charging function of the device is realized by integrating a wireless charging coil in the terminal device. In order to achieve high-efficiency transmission of electric energy, reducing the internal resistance of wireless charging coils has become a current research hotspot. Most of the existing wireless charging coils adopt the double-sided multi-strand winding method, and the two-layer charging coils are connected in parallel with each other. However, due to the eddy current effect between the coils, the current distribution of most wiring methods is uneven, resulting in high coil AC resistance, thus Reduce charging efficiency.

technical problem

The purpose of the utility model is to provide a wireless charging FPC coil structure, which is used to solve the problems of high impedance and low charging efficiency of wireless charging equipment in the prior art.

technical solutions

The technical scheme of the present utility model is as follows:

A wireless charging FPC coil structure, the wireless charging FPC coil structure includes:

an insulating medium, the two opposite surfaces of the insulating medium are a first winding plane and a second winding plane;

A first coil, the first coil includes a first upper coil that is wound from an outer ring into an inner ring layer by layer on the first winding plane, and a first upper coil that is wound from the outer ring into the inner ring layer by layer on the second winding plane the first lower coil, the first lower coil is arranged in the orthographic projection area of the first upper coil, and the first upper coil and the first lower coil pass through the first lower coil arranged on the insulating medium. Via holes for electrical connection;

The second coil, the second coil includes a second upper coil that is wound from the inner ring to the outer ring layer by layer on the first winding plane, and a second upper coil that is wound from the inner ring to the outer ring layer by layer on the second winding plane. Two lower coils, the second lower coil is provided in the orthographic projection area of the second upper coil, and the second upper coil and the second lower coil pass through a second via hole provided on the insulating medium make electrical connections;

lead wires, the lead wires include a first upper lead wire connected to the first upper coil, a first lower lead wire connected to the first lower coil, a second upper lead wire connected to the second upper coil, and a first lower lead wire connected to the first lower coil the second lower lead connected to the second lower coil;

The first upper coil, the first lower coil, the second upper coil and the second lower coil are all of two strands.

beneficial effect

The beneficial effects of the present utility model are:

The FPC wire is wound into the inner ring layer by layer from the outer ring in the form of cross winding, and then wound out layer by layer in the form of cross winding to reach the outer ring to form the FPC coil. The process is simple and the thickness is thin, which can effectively The internal resistance of the FPC coil is reduced, the cost is reduced, and the charging efficiency of the FPC coil is improved.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic three-dimensional structural diagram of the wireless charging FPC coil structure according to the first embodiment of the present invention.

2 is a schematic diagram of an exploded structure of the wireless charging FPC coil structure according to the first embodiment of the present invention.

FIG. 3 is a schematic structural diagram of the coil of FIG. 2 .

FIG. 4 is an enlarged view of part A of FIG. 2 .

FIG. 5 is a front view of the structure of the wireless charging FPC coil according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram of the cross-sectional structure of FIG. 5 .

FIG. 7 is an enlarged view of part C of FIG. 6 .

FIG. 8 is a front view of the coil of FIG. 2 .

FIG. 9 is a rear view of the coil of FIG. 2 .

BEST MODE FOR CARRYING OUT THE INVENTION

In order to facilitate the understanding of the present utility model, the present utility model will be more fully described below with reference to the related drawings. The preferred embodiments of the present utility model are shown in the accompanying drawings. However, the present invention may be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, the term "and/or, and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

1-6, the present embodiment provides a wireless charging FPC coil structure 100, the wireless charging FPC coil structure 100 includes: an insulating medium 230, two opposite surfaces of the insulating medium 230 are the first winding plane 210 and The second winding plane 220; the first coil 110, the first coil 110 includes the first upper coil 111 which is wound from the outer ring into the inner ring layer by layer on the first winding plane 210 and the first upper coil 111 which is wound from the outer ring in the second winding plane 220 by the outer ring The first lower coil 112 is wound into the inner ring layer by layer. The first lower coil 112 is arranged in the orthographic projection area of the first upper coil 111 . The first via hole 140 is electrically connected; the second coil 120 includes the second upper coil 121 which is wound from the inner ring to the outer ring layer by layer on the first winding plane 210 and the second winding plane 220 from the inner The second lower coil 122 is wound out of the outer ring layer by layer. The second lower coil 122 is arranged in the orthographic projection area of the second upper coil 121. The second vias 150 are electrically connected; the leads, the leads 130 include a first upper lead 131 connected to the first upper coil 111 , a first lower lead 132 connected to the first lower coil 112 , and a first lower lead 132 connected to the second upper coil 121 The second upper lead 133 and the second lower lead 134 connected to the second lower coil 122; the first upper coil 111, the first lower coil 112, the second upper coil 121 and the second lower coil 122 are all of two strands.

In this embodiment, the first coil 110 and the second coil 120 have a total of 11 turns, but in other embodiments, the number is not limited to 11 turns, and can be adjusted and selected according to actual needs. Since the wireless charging coil structure 100 is manufactured through the process, the thickness of the entire coil is thin, the winding process is simple, the cost is reduced, and the charging efficiency is improved. Therefore, the wireless charging coil structure 100 can be well applied to the wireless charging terminal device. The wireless charging coil structure 100 works at 100KHz, but is not limited to this frequency, and can be adjusted according to actual needs.

Since the first upper lead 131 of the lead wire is connected to the first upper coil 111, the second upper lead 133 is connected to the second upper coil 121, and the first upper coil 111 and the second upper coil 121 are arranged on the first winding plane 210, Therefore, the first upper lead 131 and the second upper lead 133 are also arranged on the first winding plane 210 . The first lower lead 132 is connected to the first lower coil 112, the second lower lead 134 is connected to the second lower coil 122, and the first lower coil 112 and the second lower coil 122 are arranged on the second winding plane 220, so the first The lower lead 132 and the second lower lead 134 are also arranged on the second winding plane 220 . The insulating medium 230 is extended on the surfaces corresponding to the first upper lead 131 , the second upper lead 133 , the first lower lead 132 and the second lower lead 134 , and serves as the first upper lead 131 , the first lower lead 132 and the second lower lead 134 . The insulation between the upper lead 133 and the second lower lead 134 does not require additional separate insulating layers for the first upper lead 131 , the second upper lead 133 , the first lower lead 132 and the second lower lead 134 , which saves process costs.

The inner and outer diameters of the first coil 110 and the second coil 120 may be 20 mm and 48 mm, respectively. In other possible implementations, the inner and outer diameters of the first coil 110 and the second coil 120 may be changed to a certain extent, which is not limited to this embodiment. data in the example.

Since the first upper coil 111 , the first lower coil 112 , the second upper coil 121 and the second lower coil 122 are all of two strands, it is convenient to reduce the internal resistance of the coil, thereby improving the charging efficiency of the coil.

The first upper coil 111 and the first lower coil 112 are arranged at intervals through the insulating medium 230, so that the first upper coil 111 and the first lower coil 112 are easily wound, and the passing current is evenly distributed, which effectively reduces the internal resistance of the first coil 110. Improve charging efficiency. The second upper coil 121 and the second lower coil 122 are arranged at intervals through the insulating medium 230, so that the second upper coil 121 and the second lower coil 122 can be easily wound, and the current distribution is uniform, which effectively reduces the internal resistance of the second coil 120. Improve charging efficiency.

Referring to FIGS. 8-9 , the line widths of the first coil 110 and the second coil 120 gradually increase from the inner circle to the outer circle. Since the line widths of the first coil 110 and the second coil 120 gradually increase from the inner circle to the outer circle, the internal resistance of the first coil 110 and the second coil 120 can be further reduced, thereby further improving the wireless charging efficiency.

Referring to FIGS. 8-9 , as a specific implementation manner, the line spacing between the first coil 110 and the second coil 120 is 50 μm, so that the internal resistance of the coil can be further reduced. In other possible implementation manners, the spacing between the lines can be changed to a certain extent, which is not limited to the data in this embodiment, and can be adjusted according to actual conditions as required.

The lead 130, the first coil 110 and the second coil 120 are produced and formed by the FPC process, and have the characteristics of high wiring density, light weight, thin thickness and good bendability.

Referring to FIGS. 1-7 , the first upper coil 111 and the second upper coil 121 are covered with a first cover film 170 , and the first lower coil 112 and the second lower coil 122 are covered with a second cover film 180 . The first upper coil 111 , the second upper coil 121 , the first lower coil 112 and the second lower coil 122 can be effectively covered by the first covering film 170 and the second covering film 180 , avoiding the first upper coil 111 , the second upper coil 111 and the second lower coil 122 The surfaces of the upper coil 121 , the first lower coil 112 and the second lower coil 122 are exposed, and the safety is high.

Referring to FIG. 2 and FIGS. 8-9 , the first cover film 170 extends and covers the first upper lead 131 and the second upper lead 133 . The surface of the first upper lead 131 and the second upper lead 133 can be completely covered, and the protection effect is good.

Referring to FIG. 2 and FIGS. 8-9 , the second cover film 180 extends and covers the first lower lead 132 and the second lower lead 134 . The surfaces of the first lower lead 132 and the second lower lead 134 can be completely covered, and the protection effect is good.

2-7, the first cover film 170 and the first upper coil 111 and the second upper coil 121 are bonded and fixed by the first double-sided tape 190, and the second cover film 180 and the first lower coil 112 The second lower coil 122 is bonded and fixed by the second double-sided tape 200 . The first double-sided tape 190 is convenient for installing and fixing the first cover film 170 on the first upper coil 111 and the second upper coil 121, and the second double-sided tape 200 is convenient for installing and fixing the second cover film 180 on the first lower coil 112 and the second upper coil 121. Two lower coils 122, so that the first cover film 170 and the second cover film 180 can be easily installed.

Referring to FIGS. 2-7 , the wireless charging coil structure 100 includes, from top to bottom, a first cover film 170 , a first double-sided tape 190 , a first winding plane 210 , an insulating medium 230 , and a second winding plane 220 , the second double-sided adhesive tape 200 and the second cover film 180 , wherein the first coil 110 and the second coil 120 are crossed and arranged in the first winding plane 210 and the second winding plane 220 .

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to The scope of protection of the utility model.

Claims

A wireless charging FPC coil structure, characterized in that the wireless charging FPC coil structure includes:

an insulating medium, the two opposite surfaces of the insulating medium are a first winding plane and a second winding plane;

A first coil, the first coil includes a first upper coil that is wound from an outer ring into an inner ring layer by layer on the first winding plane, and a first upper coil that is wound from the outer ring into the inner ring layer by layer on the second winding plane the first lower coil, the first lower coil is arranged in the orthographic projection area of the first upper coil, and the first upper coil and the first lower coil pass through the first lower coil arranged on the insulating medium. Via holes for electrical connection;

The second coil, the second coil includes a second upper coil that is wound from the inner ring to the outer ring layer by layer on the first winding plane, and a second upper coil that is wound from the inner ring to the outer ring layer by layer on the second winding plane. Two lower coils, the second lower coil is provided in the orthographic projection area of the second upper coil, and the second upper coil and the second lower coil pass through a second via hole provided on the insulating medium make electrical connections;

lead wires, the lead wires include a first upper lead wire connected to the first upper coil, a first lower lead wire connected to the first lower coil, a second upper lead wire connected to the second upper coil, and a first lower lead wire connected to the first lower coil the second lower lead connected to the second lower coil;

The first upper coil, the first lower coil, the second upper coil and the second lower coil are all of two strands.
The wireless charging FPC coil structure according to claim 1, wherein the first coil and the second coil have different line widths from the inner circle to the outer circle.
The wireless charging FPC coil structure according to claim 2, wherein the line width of the first coil and the second coil gradually increases from the inner circle to the outer circle.
The wireless charging FPC coil structure according to claim 3, wherein the line spacing between the first coil and the second coil is 50 microns.
The wireless charging FPC coil structure according to claim 1, wherein the first upper coil and the second upper coil are covered with a first cover film, and the first lower coil and the second lower coil are covered with a first cover film. The coil is covered with a second cover film.
The wireless charging FPC coil structure according to claim 5, wherein the first cover film extends and covers the first upper lead and the second upper lead.
The wireless charging FPC coil structure according to claim 5, wherein the second cover film extends and covers the first lower lead and the second lower lead.
The wireless charging FPC coil structure according to claim 5, wherein the first cover film, the first upper coil and the second upper coil are bonded and fixed by a first double-sided tape, so The second cover film, the first lower coil and the second lower coil are bonded and fixed by a second double-sided tape.
The wireless charging FPC coil structure according to claim 1, wherein the inner and outer diameters of the first coil and the second coil are 20 mm and 48 mm, respectively.