CN108270078B - High-efficiency wireless charging receiving antenna - Google Patents
High-efficiency wireless charging receiving antenna Download PDFInfo
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- CN108270078B CN108270078B CN201810083196.3A CN201810083196A CN108270078B CN 108270078 B CN108270078 B CN 108270078B CN 201810083196 A CN201810083196 A CN 201810083196A CN 108270078 B CN108270078 B CN 108270078B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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Abstract
The invention discloses a wireless charging receiving antenna structure, comprising: a substrate; m coils disposed on the substrate; an isolation region disposed between two adjacent coils; a coil groove disposed on an outermost N turns of the coil, wherein N < M; a first electrode electrically connected to a first end of the coil; and a second electrode electrically connected to the second end of the coil.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a high-efficiency wireless charging receiving antenna.
Background
Wireless Charging Technology (Wireless Charging Technology) refers to a Technology that realizes contactless power transmission through an air medium not through a wire but through electromagnetic induction, electromagnetic resonance, or the like. Compared with a traditional charging mode, the wireless charging technology does not need wiring and a charging terminal, and is high in convenience. With the development of power electronic devices, power conversion and control technologies, the wireless charging technology gradually makes breakthrough in the aspects of conversion rate, low radiation and the like, the wireless charging is put into practical use in some household electrical appliances such as electric toothbrushes, electric shavers, cordless telephones and the like at present, the application range of the wireless charging technology is expanded to the field of smart phones at present, and the wireless charging technology is continuously expanded to more fields such as medical treatment, electric power, aerospace, energy conservation, environmental protection and the like in the future.
Among various wireless charging technical solutions, the most mature and common way is electromagnetic induction, and in recent years, the most popular way is to charge wirelessly. From the perspective of wireless charging technology using electromagnetic induction, improving high efficiency is a major breakthrough in the future, and the wireless charging receiving antenna is a key influencing factor of charging efficiency.
The existing wireless charging receiving antenna scheme is generally an FPC antenna as shown in fig. 1, the width of the copper wire of the antenna coil is uniform, generally 11 turns of double-layer winding are adopted, the wire width is about 1 mm, the pitch width of the winding is about 0.1 mm, and the thickness of the copper layer of the coil is about 45 microns. When exchanging wireless charging, this kind of FPCB wire winding scheme leads to transmission energy efficiency to hardly promote because of the influence of factors such as skin effect, vortex, quality factor is lower, and the temperature rise is higher simultaneously.
In order to overcome the above problems, patent CN 107452483 a proposes a winding method of a wire group, as shown in fig. 2, which improves the quality factor and thus the charging efficiency by subdividing the wires to overcome the skin effect. However, the method is difficult to miniaturize and miniaturize due to factors such as the size and specification of the wire group, for example, the requirement of a wireless charging scheme of a smart phone is difficult to meet.
Therefore, there is a need in the art for a novel high-efficiency wireless charging receiving antenna, which at least partially solves the above-mentioned problems of difficult improvement of transmission energy efficiency, high temperature rise, low quality factor, etc. in the prior art.
Disclosure of Invention
To solve the problems in the prior art, according to an embodiment of the present invention, there is provided a wireless charging receiving antenna structure, including:
a substrate;
m coils disposed on the substrate;
an isolation region disposed between two adjacent coils;
a coil groove disposed on an outermost N turns of the coil, wherein N < M;
a first electrode electrically connected to a first end of the coil; and
a second electrode electrically connected to the second end of the coil.
In one embodiment of the invention, the winding width of the M-turn coil is gradually increased from inside to outside.
In one embodiment of the invention, the coil is a double layer wound coil.
In one embodiment of the present invention, said M ═ 11; and N is 4.
In one embodiment of the present invention, the coil groove is an interrupted arc groove, and the arc groove is concentric with the coil on which the arc groove is located.
In one embodiment of the invention, the arc-shaped grooves of the coil discontinuities arranged on the outermost N turns of the coil are distributed in a radial equal arc shape.
In one embodiment of the present invention, the isolation region is a gap without filler or a gap filled with an insulating material.
In one embodiment of the invention, the width of the coil is gradually increased from 0.9 mm to 1.3 mm from inside to outside, and the thickness of the coil is 40 micrometers to 70 micrometers; the width of the isolation region is 80-120 microns; the width of the coil groove is 80 to 120 micrometers.
In one embodiment of the present invention, the coil groove disposed on the outermost N turns of the coil further includes:
k coil grooves are formed in the L coils on the outermost sides of the coils, wherein L is less than N, and K is more than or equal to 2;
j coil grooves are formed in the coil on the second outer side I coil, wherein L + I is less than or equal to N, and J is less than or equal to 1 and less than K.
In one embodiment of the invention, the substrate is a flexible circuit substrate.
Compared with the traditional scheme, the high-efficiency wireless charging FPC receiving antenna structure provided by the invention has the advantages that the resistance of the antenna structure is reduced, the skin effect of the coil and the influence of eddy current caused by the line width are reduced, the transmission energy efficiency is improved, and the temperature rise in the charging process is improved.
Drawings
To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.
Fig. 1 shows a schematic diagram of a prior art wireless charging FPC receiving antenna structure.
Fig. 2 shows a schematic diagram of a wireless charging receiving antenna structure of another prior art.
Fig. 3 illustrates a front view of a high efficiency wireless charging FPC receiving antenna structure formed in accordance with an embodiment of the present invention.
Fig. 4 illustrates a partial front view of a high efficiency wireless charging FPC receiving antenna structure formed in accordance with an embodiment of the present invention.
Fig. 5 illustrates a partial cross-sectional schematic view of a high efficiency wireless charging FPC receive antenna structure formed in accordance with an embodiment of the present invention.
Fig. 6 illustrates a graph comparing transmission energy efficiency of a high efficiency wireless charging FPC receiving antenna formed according to an embodiment of the present invention with that of a conventional scheme.
Fig. 7 illustrates a graph comparing the temperature rise during charging for a high efficiency wireless charging FPC receiving antenna formed according to an embodiment of the present invention with a conventional scheme.
Fig. 8 illustrates a partial front view of a high efficiency wireless charging FPC receiving antenna structure formed in accordance with yet another embodiment of the present invention.
Detailed Description
In the following description, the invention is described with reference to various embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of embodiments of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention may be practiced without specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.
Reference in the specification to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.
Compared with the traditional scheme, the high-efficiency wireless charging FPC receiving antenna structure provided by the invention has the advantages that the resistance of the antenna structure is reduced, the skin effect of the coil and the influence of eddy current caused by the line width are reduced, the transmission energy efficiency is improved, and the temperature rise in the charging process is improved.
A high-efficiency wireless charging FPC receiving antenna structure formed according to one embodiment of the present invention is described below with reference to fig. 3 and 4. Fig. 3 illustrates a front view of a high efficiency wireless charging FPC receiving antenna structure 300 formed in accordance with an embodiment of the present invention; fig. 4 illustrates a partial front view of a high efficiency wireless charging FPC receiving antenna structure 300 formed in accordance with an embodiment of the present invention.
As shown in fig. 3, the high-efficiency wireless charging FPC receiving antenna structure 300 includes a first electrode 301, a second electrode 302, a coil 303, an isolation region 304, and a coil slot 305. Wherein the first electrode 301 and the second electrode 302 are used for forming an electrical connection with the energy receiver, so that the induced current generated by the coil is conducted to the energy receiver; the coil 303 converts the change of the induced magnetic field into an induced current based on the electromagnetic induction principle; the isolation region 304 is used to electrically insulate the adjacent coils 303; the coil groove 305 is provided on the coil 303 for dividing the coil wire where the coil groove 305 is located into two wires connected in parallel, and the coil groove 305 is a discontinuous groove with a certain curvature and is provided only on the outer turns of the coil.
Further structure of the high-efficiency wireless charging FPC receiving antenna structure 300 will be described in detail with reference to fig. 4. As shown in fig. 4, the width of the coil 303 gradually widens from inside to outside, in one specific implementation of the present invention, the coil 303 is a double-layer coil, 11 turns are provided, the width from inside to outside gradually increases from 0.9 mm to 1.3 mm, the thickness of the coil is about 60 microns, the internal resistance of the whole coil can be significantly reduced by gradually increasing the width of the coil from inside to outside, because the longer the coil circumference is, the better the effect can be produced by width adjustment when the thickness and the length cannot be changed.
Continuing with fig. 4, isolation regions 304 are uniformly distributed between every two turns of coil 303. in one embodiment of the present invention, the width of isolation regions 304 is about 0.1 mm (100 μm), and isolation regions 304 may be gaps with no filler or structures with insulating material filled after isolation.
As shown in FIG. 4, a plurality of coils close to the outermost side are provided with coil grooves 305, the coil grooves 305 divide the coil wire in the area of the grooves into two parallel wires, thereby reducing the skin effect and the influence of eddy current when the whole coil works, in one embodiment of the invention, the coil grooves 305 are arranged on the 4 coils at the outermost side, the coil grooves 305 and the coils are in concentric arcs, the width of the coil grooves 305 is about 0.1 millimeter (100 micrometers), the coil grooves 305 on one coil are in uniform and discontinuous N-segment arc distribution, N is more than or equal to 2, the whole coil conductor is arranged between the adjacent coil grooves 305 on the coil, the design has lower coil resistance relative to the whole continuous grooves arranged on the coil, in another embodiment of the invention, the coil grooves 305 on the outer side coils 303 are in radial equal arc distribution, such as radial α shown in FIG. 41、α2Schematically.
Those skilled in the art should appreciate that the specific numbers of the layers, the number of turns, the width and the thickness of the coil 303, the width of the isolation region 304, the number of turns, the number of segments, the length and the width of the coil groove 305 disposed on the coil 303, and whether the coil groove is radially distributed in an equal arc are not limitations of the present invention, and only serve as exemplary embodiments. The technical scheme that discontinuous coil grooves are distributed on the partial coil close to the outer side is within the protection scope of the invention as long as the width of the coil is gradually increased from the inside to the outside.
A high efficiency wireless charging FPC receiving antenna structure 500 formed in accordance with another embodiment of the present invention is further described below in conjunction with fig. 5. Fig. 5 illustrates a partial cross-sectional schematic view of a high efficiency wireless charging FPC receive antenna structure formed in accordance with an embodiment of the present invention. The cross-sectional area of FIG. 5(A) is from the position shown in FIG. 3 by the dashed line AA'.
As shown in fig. 5(a), the high-efficiency wireless charging FPC receiving antenna structure 500 further includes a substrate 501, the substrate 501 is a flexible circuit substrate, and M coils 502 are disposed on the substrate 501, in one embodiment of the present invention, M is 11, that is, there are coils 502-1, 502-2 … 502-11 disposed on the substrate 501, and the widths of the coils 502-1 to 502-11 gradually widen from 0.9 mm to 1.3 mm; an isolation region 503 is disposed between the coils, and in one embodiment of the present invention, the width of the isolation region 503 is about 0.1 mm; near the outer side of the substrate 501, i.e., the left side in fig. 5(a), there are 4 turns of the coil formed with the coil groove 504, and as shown in fig. 5(B), the coil groove 504 is similar to the coil groove 305 described above, and is also an intermittent arc-shaped groove, and the width of the groove is also about 0.1 mm.
In order to more clearly illustrate the technical effects of the present invention, a comparative test is performed on the conventional antenna scheme and the antenna scheme of the present invention, and the specific scheme of the comparative test is as follows:
according to the conventional scheme, as shown in fig. 1, a coil is double-layer and 11 turns, the width of the coil is 1 mm, the thickness of the coil is 45 microns, and the distance between windings is 0.1 mm.
According to the scheme of the invention, as shown in fig. 3, the coil is double-layer 11-turn, the width of the coil is gradually widened from 0.9 mm to 1.3 mm, the thickness of the coil is 60 micrometers, the winding distance is 0.1 mm, and middle interval grooving is performed on 4 outer-turn coils.
The basic electrical parameters tested are shown in table 1 below:
table 1 comparison table of antenna electrical performance between conventional scheme and inventive scheme
As can be seen from the comparison of the above table, Rs and Rdc of the scheme of the invention are obviously lower than those of the traditional scheme, and the Q value is also higher than that of the traditional scheme.
The transmission energy efficiency and the temperature rise of the conventional scheme and the inventive scheme are tested and compared with each other in combination with fig. 6 and 7. FIG. 6 illustrates a graph comparing transmission energy efficiency of a high efficiency wireless charging FPC receiving antenna formed in accordance with an embodiment of the present invention with a conventional scheme; fig. 7 illustrates a graph comparing temperature rise of a high efficiency wireless charging FPC receiving antenna formed according to an embodiment of the present invention with a conventional scheme.
As shown in fig. 6, the antenna solution of the present patent has an increase in transmission energy efficiency of 1% -2% compared to the conventional solution except for a lower output current range (e.g., a range in which the output current is less than about 0.3A), and the increase in transmission energy efficiency can improve the loss such as temperature rise and extra radiation.
As shown in fig. 7, the antenna of the present patent has a lower temperature rise during charging than the conventional antenna, and the average temperature can be lowered by 2-3 ℃. The reduction of the temperature rise can improve the experience of the product, prolong the service life of the product and reduce the energy consumption.
An implementation based on yet another embodiment of the present invention is described below in conjunction with fig. 8, fig. 8 showing a partial front view of a high-efficiency wireless charging FPC receiving antenna structure 800 formed in accordance with yet another embodiment of the present invention, which is similar to the wireless charging FPC receiving antenna structure 300 shown in fig. 3, except that as the width of the coil 801 increases, a single discontinuous coil trench 803 is provided on the coil 801-j, as at 801-j, when the width of the coil 801 reaches a threshold a, as shown in fig. 8; as the coil width continues to increase to threshold B, as at 801-k, two grooves 804 are provided on the coil 801-k from there. It should be understood by those skilled in the art that the present embodiment is only an example, and according to a similar design, 3, 4, and so on coil grooves can be provided based on the width increase of the coil to reduce the skin effect and the eddy current caused by the line width of the coil.
According to the high-efficiency wireless charging FPC receiving antenna structure provided by the invention, the multi-turn coil with the gradually increased line width from inside to outside is arranged on the substrate, and the discontinuous coil grooves are arranged on the coils close to the outside.
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (9)
1. A wireless charging receive antenna structure, comprising:
a substrate;
m coils disposed on the substrate;
an isolation region disposed between two adjacent coils;
the coil groove is arranged on the N rings on the outermost sides of the coils, wherein N is less than M, the coil groove is used for dividing a coil wire at the position of the coil groove into parallel wires, and the coil groove is a discontinuous groove with a certain radian;
a first electrode electrically connected to a first end of the coil; and
a second electrode electrically connected to a second end of the coil,
the winding width of the M coils is gradually increased from inside to outside, and when the width of the coil reaches a threshold value A, a single discontinuous coil groove is arranged on the M coils; from there, two grooves are provided on the coil width as it continues to increase to the threshold B.
2. The wireless charging receive antenna structure of claim 1 wherein the coil is a double layer wound coil.
3. The wireless charging receive antenna structure of claim 1, wherein said M-11; and N is 4.
4. The wireless charging receive antenna structure of claim 1 wherein the coil grooves are discontinuous arcuate grooves concentric with the coil in which they are located.
5. The wireless charging receiving antenna structure as claimed in claim 1, wherein the arc-shaped grooves of the coil discontinuities on the outermost N turns of the coil are radially equi-radiantly distributed.
6. The wireless charging receive antenna structure of claim 1 wherein the isolation region is a filler-free gap or a gap filled with an insulating material.
7. The wireless charging receiving antenna structure of claim 1, wherein the width of the coil gradually increases from 0.9 mm to 1.3 mm from inside to outside, and the thickness of the coil is 40 micrometers to 70 micrometers; the width of the isolation region is 80-120 microns; the width of the coil groove is 80 to 120 micrometers.
8. The wireless charging receive antenna structure of claim 1 wherein the coil grooves disposed on the outermost N turns of the coils further comprise:
k coil grooves are formed in the L coils on the outermost sides of the coils, wherein L is less than N, and K is more than or equal to 2;
j coil grooves are formed in the coil on the second outer side I coil, wherein L + I is less than or equal to N, and J is less than or equal to 1 and less than K.
9. The wireless charging receive antenna structure of claim 1 wherein the substrate is a flexible circuit substrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810083196.3A CN108270078B (en) | 2018-01-29 | 2018-01-29 | High-efficiency wireless charging receiving antenna |
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| CN201810083196.3A CN108270078B (en) | 2018-01-29 | 2018-01-29 | High-efficiency wireless charging receiving antenna |
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| CN108270078B true CN108270078B (en) | 2020-08-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023215286A1 (en) * | 2022-05-02 | 2023-11-09 | University Of Tennessee Research Foundation | Self-resonant coil with series lc resonance and electric field cancelation |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038851B (en) * | 2018-08-02 | 2021-03-16 | 东莞顺络电子有限公司 | Wireless charging coil module |
| CN213905105U (en) * | 2020-11-03 | 2021-08-06 | 瑞声精密制造科技(常州)有限公司 | Wireless FPC coil structure that charges |
| CN113364144A (en) * | 2021-07-05 | 2021-09-07 | 浙江晶日科技股份有限公司 | Coil, wireless charging transmitting and receiving device and mobile terminal |
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| CN107068357A (en) * | 2017-06-15 | 2017-08-18 | 深圳市信维通信股份有限公司 | A kind of induction coil structure and preparation method for wireless charging device |
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| US5574470A (en) * | 1994-09-30 | 1996-11-12 | Palomar Technologies Corporation | Radio frequency identification transponder apparatus and method |
| JP2000286630A (en) * | 1999-03-31 | 2000-10-13 | Toshiba Corp | Transmitter and receiver antenna |
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| WO2023215286A1 (en) * | 2022-05-02 | 2023-11-09 | University Of Tennessee Research Foundation | Self-resonant coil with series lc resonance and electric field cancelation |
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Effective date of registration: 20200630 Address after: Block a, 2 / F, building 11, No.78 Binjiang Road, Xinhe Town, Chongming District, Shanghai 202156 Applicant after: SHANGHAI WANCI NEW MATERIAL TECHNOLOGY Co.,Ltd. Address before: No. 4, No. 999, Jinle Road, Baoshan District, Shanghai Applicant before: SHANGHAI ZHULU ELECTRONIC TECHNOLOGY Co.,Ltd. |
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