CN204480870U - A kind of transmitting coil structure of high quality factor - Google Patents
A kind of transmitting coil structure of high quality factor Download PDFInfo
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- CN204480870U CN204480870U CN201520036919.6U CN201520036919U CN204480870U CN 204480870 U CN204480870 U CN 204480870U CN 201520036919 U CN201520036919 U CN 201520036919U CN 204480870 U CN204480870 U CN 204480870U
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Abstract
The utility model discloses a kind of transmitting coil structure of high quality factor, described transmitting coil comprises coil, fit in the insulating barrier of coil and fit in the screen of insulating barrier, its coil is made up of the M circle coiling of sparse winding and the N circle coiling of closely winding, spacing between described M circle coiling circle and circle is greater than the spacing between described N circle coiling circle and circle, and M < N.Coil winding mode of the present utility model can reduce the approach effect of coil, reduce the wastage, and blind area, the magnetic field scope of transmitting coil can be reduced, thus the quality factor of transmitting coil are improved greatly, and, uniform Distribution of Magnetic Field can be produced around transmitting coil, can more effectively transmitting energy.
Description
Technical field
The utility model relates to wireless power transmission field, more particularly, relates to a kind of transmitting coil structure of high quality factor.
Background technology
Need in radio energy system to use induction coil (such as transmitting coil) to carry out the transmission of energy, due to the stock that transmitting coil is excitation energy, the quality of its performance directly affects the efficiency of Energy Transfer, therefore, manage the performance improving transmitting coil, the efficiency of transmission of whole system can be improved.And in the parameters of coil, quality factor q is the important indicator of reflection coil performance, quality factor q value is higher, and coil loss is less, then efficiency is higher.
On the one hand, quality factor q value is wound with much relations with coil, and the coiling of the inductance coil of current wireless power transmission adopts the helical structure of centreless usually, and coiling shape has rectangle, hexagon and circle, and rectangle easily makes, but quality factor are usually all lower.The mode of the hexagon coil arrangement of multilayer can produce uniform magnetic field, this method is equivalent to be with a large hot-wire coil at hot-wire coil outer, although hexagonal coil can provide comparatively uniform magnetic field, but due to the magnetic field effect of cancelling out each other produced during adjacent hexagon coil working, make electric current excite the efficiency in magnetic field not high, thus quality factor q is not high.Existing circle mostly is circle or the ellipse of the plane be closely wound around with litz wire, structure as shown in Figure 1, and usually the coil wound is placed on ferrite magnetic sheet, with the magnetic field above intensifier coil, this design is applicable to low frequency operation usually, in high-frequency work situation, because winding tight between coil and coil can make to cause the AC impedance of coil significantly to increase each other due to approach effect, thus also high quality factor cannot be obtained.
On the other hand, quality factor q also has relation, the size etc. of the Distance geometry screen of such as screen off-line circle with the outer field screen of coil.In order to the magnetic field that shielded coil excites, generally adopt double-layer shielding structure, double-layer shielding structure includes magnetic sheet layer and layers of copper, and double-layer shielding structure is close to coil layer and is placed.Arrangement architecture figure such as shown in Fig. 2, in fig. 2, the thickness of insulating barrier (insulating layer) is very little, is usually less than 0.5mm.When double layer screen layer and field generator for magnetic and coil fit tightly, the quality factor of system can reduce, in the position being close to coil, the intensity of alternating magnetic field is maximum, the alternating magnetic field of high strength can cause producing more magnetic loss in the ferrite magnetic sheet at this position, and due to the finite thickness of ferrite magnetic sheet, after the shielding of ferrite magnetic sheet, still have the magnetic field of suitable intensity and second layer screen and layers of copper to meet, this part remnant field can excite eddy current and produce loss in layers of copper, and this reduce further again the quality factor of system.
Utility model content
In view of this, the utility model proposes a kind of transmitting coil structure of high quality factor, by coil being wherein set to the combination of sparse coiling and tight coiling, and the number of turns of sparse coiling is less than the number of turns of tight coiling, the approach effect of coil can be reduced like this, also can effectively reduce the scope of blind area, magnetic field, area utilization is large, makes transmitting coil obtain high quality factor simultaneously, and can produce uniform Distribution of Magnetic Field around primary coil, energy transmission efficiency is good.
According to the transmitting coil structure of a kind of high quality factor of the present utility model, comprise coil, fit in the insulating barrier of coil and fit in the screen of insulating barrier.
Described coil comprises the M circle coiling being positioned at internal layer and the N circle coiling be positioned at outside the coiling of M circle, and wherein, the spacing between described M circle coiling circle and circle is greater than the spacing between described N circle coiling circle and circle, and M < N.
Preferably, the spacing between the coiling of described M circle is set to a certain value between 1cm to 20cm.
Preferably, the spacing between the coiling of described N circle is set to a certain value between 0cm to 1cm.
Further, the thickness of described insulating barrier is arranged according to the thickness requirement of described transmitting coil.
Preferably, the thickness of described insulating barrier is set to be more than or equal to 2mm.
Preferably, described screen comprises the first screen be made up of magnetic sheet and the secondary shielding layer be made up of copper sheet.
A kind of transmitting coil structure of high quality factor in sum, its coil is made up of the M circle coiling of sparse winding and the N circle coiling of closely winding, spacing between described M circle coiling circle and circle is greater than the spacing between described N circle coiling circle and circle, and M < N, coil winding mode of the present utility model can make the quality factor of former edge emitting coil greatly improve, and, uniform Distribution of Magnetic Field can be produced around transmitting coil, simultaneously, the technical solution of the utility model can make the blind area scope of transmitting coil significantly reduce, thus make secondary can obtain required energy in larger area.
Accompanying drawing explanation
Figure 1 shows that the structure chart of the annular emission coil of prior art;
Figure 2 shows that the end view with the transmitting coil of insulating barrier of prior art;
Figure 3 shows that the structure chart according to transmitting coil of the present utility model;
Figure 4 shows that according to the end view with the transmitting coil of insulating barrier of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiment of the present utility model is described in detail, but the utility model is not restricted to these embodiments.The utility model contain any make on marrow of the present utility model and scope substitute, amendment, equivalent method and scheme.To have the utility model to make the public and understand thoroughly, in following the utility model preferred embodiment, describe concrete details in detail, and do not have the description of these details also can understand the utility model completely for a person skilled in the art.
With reference to the structure chart that Figure 3 shows that according to transmitting coil of the present utility model, transmitting coil of the present utility model is applied in radio energy transmission system, and it transfers to the magnetic field energy of secondary in order to produce.In the utility model embodiment, described transmitting coil comprises coil, fit in the insulating barrier of coil and fit in the screen of insulating barrier, wherein, described coil comprises the M circle coiling being positioned at internal layer and the N circle coiling be positioned at outside the coiling of M circle, wherein, spacing between described M circle coiling circle and circle is greater than the spacing between described N circle coiling circle and circle, and, M < N.
Wherein, the spacing between the coiling of described M circle is set to a certain value between 1cm to 20cm, and preferably, in the present embodiment, the spacing between the coiling of described M circle is set to 3cm.
Wherein, the spacing between the coiling of described N circle is set to a certain value between 0cm to 1cm, and preferably, in the present embodiment, the spacing between the coiling of described N circle is set to 0.2cm.
As shown in Figure 3, in the present embodiment, the value of described M is set to M=2, and the value of described N is set to N=4, meets the condition of M < N.
As said in background technology, when the coiling of coil is all closely wound around, the AC impedance of coil can be caused significantly to increase due to approach effect when high-frequency current work, and in the utility model, the mode adopting the sparse winding of M circle and N circle to be closely wound around can make approach effect under high-frequency current working condition greatly weaken, thus the AC impedance of coil is reduced, lower the loss of coil, improve the quality factor of coil.
In general, the sense of current in adjacent coiling is identical, and in the centre position of two wires, the contrary thus magnetic flux line of flow direction can be cancelled out each other, and therefore directly over the coiling of N circle, there is more horizontal component in the direction of magnetic flux.If secondary coil is positioned over directly over N circle cabling, the flux component then penetrating secondary coil seldom, can cause the non-constant of the coupling coefficient of former secondary coil, thus occurs the blind area of coupling, blind area can cause the area utilization of coil low, thus reduces quality factor.So in the utility model embodiment, the frame mode of N circle coiling is added by above-mentioned M circle, and the wiring width of its N circle coiling can be narrow with the scope reducing blind area, such as, but N circle herein is closely wound around and still can ensures interval necessary between coiling and coiling, and its interval is set to as 0.1cm or 0.2cm weakens to make approach effect.
Visible, primary coil is set to sparse winding and is closely wound around two parts by the utility model, and, the number of turns of sparse winding is less than the number of turns be closely wound around, the approach effect of coil can be made to reduce, and the wiring width of closely winding part is set to narrow with the scope reducing blind area, magnetic field above transmitting coil, area coil utilance can be made high, thus effectively can improve the quality factor of coil.
When wireless charging energy requirement is larger, it is larger to form large charged area that former edge emitting area coil needs do, and the center of at this moment N circle coiling distance coil is comparatively far away, therefore only has less flux component to be distributed in hub of a spool position.And by the M circle wire of sparse winding in the utility model, make the flux component that still can have at the center of coil to a certain degree, and by the design of N > M, the magnetic flux that the coiling of M circle is produced can offset the comparatively dense flux component inside the coiling of N circle, thus make the surrounding magnetic field of whole transmitting coil even, effectively improve the energy transmission efficiency of wireless charging.
Easy understand; the utility model embodiment has carried out example explanation to the coiling of above-mentioned M circle and the coiling of N circle; but the spacing of the coiling of described M circle and the coiling of N circle and quantity are not limited to the description that above-described embodiment is done, the amendment done under the guidance of thought of the present utility model and change are all under protection range of the present utility model.Those skilled in the art are known, and M circle described in the utility model coiling and the coiling of N circle are the coilings forming coil, are namely that a coiling is wound around sparse M circle coiling in side in coil, are wound around N circle coiling closely in outside.
In addition, it is insulating barrier that described transmitting coil comprises the skin fitting in coil, and the thickness of the insulating barrier in the present embodiment is arranged according to the thickness requirement of transmitting coil.Described transmitting coil also comprises and fits in the outer field screen of insulating barrier, and in the present embodiment, described screen is the double layer screen layer be made up of magnetic sheet layer and copper sheet layer.
In the utility model embodiment, for ensureing that the quality factor of transmitting coil are not significantly reduced by double layer screen layer, the utility model by the interplanar of coil plane and double layer screen every certain spacing, in the scope that transmitting coil thickness allows, double layer screen distance coil interplanar is every larger, and the quality factor of system are higher.In the present embodiment in the scope that the thickness of transmitting coil allows, the thickness of described insulating barrier is set to be more than or equal to 2mm, profile as shown in Figure 4, and here, described insulating barrier can be the fixing glue of insulation or air gap.Double layer screen layer and coil plane spacing distance are increased, thus makes double layer screen layer avoid the most intensive place of magnetic flux, to make the loss that produces in double layer screen layer less, ensure that transmitting coil has high quality factor further.
To sum up, the transmitting coil structure of a kind of high quality factor of the present utility model, by the winding mode of M+N circle, the approach effect of former edge emitting coil is weakened, quality factor improve greatly, and, the wiring width of N circle coiling is set to narrower with the blind area scope reducing magnetic field, the area utilization of coil can be improved, further, uniform Distribution of Magnetic Field can be produced around transmitting coil, thus effectively improve the energy transmission efficiency of radio energy transmission system.Carried out detailed description to the transmitting coil structure of a kind of high quality factor according to preferred embodiment of the present utility model above, those of ordinary skill in the art can know other technologies or structure and circuit layout, element etc. accordingly by inference and all can be applicable to described embodiment.
According to embodiment of the present utility model as described above, these embodiments do not have all details of detailed descriptionthe, do not limit the specific embodiment that this utility model is only described yet.Obviously, according to above description, can make many modifications and variations.This specification is chosen and is specifically described these embodiments, is to explain principle of the present utility model and practical application better, thus makes art technical staff that the utility model and the amendment on the utility model basis can be utilized well to use.The utility model is only subject to the restriction of claims and four corner and equivalent.
Claims (5)
1. a transmitting coil structure for high quality factor, comprises coil, fits in the insulating barrier of coil and fits in the screen of insulating barrier, it is characterized in that,
Described coil comprises the M circle coiling being positioned at internal layer and the N circle coiling be positioned at outside the coiling of M circle, and wherein, the spacing between described M circle coiling circle and circle is greater than the spacing between described N circle coiling circle and circle, and M < N.
2. transmitting coil structure according to claim 1, is characterized in that, the spacing between the coiling of described M circle is set to a certain value between 1cm to 20cm.
3. transmitting coil structure according to claim 1, is characterized in that, the spacing between the coiling of described N circle is set to a certain value between 0cm to 1cm.
4. transmitting coil structure according to claim 1, is characterized in that, the thickness of described insulating barrier is set to be more than or equal to 2mm.
5. transmitting coil structure according to claim 1, is characterized in that, described screen comprises the first screen be made up of magnetic sheet and the secondary shielding layer be made up of copper sheet.
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| CN201520036919.6U CN204480870U (en) | 2015-01-15 | 2015-01-15 | A kind of transmitting coil structure of high quality factor |
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| CN201520036919.6U CN204480870U (en) | 2015-01-15 | 2015-01-15 | A kind of transmitting coil structure of high quality factor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105845404A (en) * | 2015-01-15 | 2016-08-10 | 宁波微鹅电子科技有限公司 | Transmitting coil structure with high-quality factor and winding method thereof |
| CN106952710A (en) * | 2017-05-12 | 2017-07-14 | 福州大学 | A kind of wireless charging magnetic coupling arrangement and its circuit for multi-load |
| CN108391457A (en) * | 2015-09-11 | 2018-08-10 | 扬科技术有限公司 | Utilize the wireless charging platform of three dimensional Phase coil array |
| CN109643607A (en) * | 2016-09-28 | 2019-04-16 | 日本电产株式会社 | Non-contact power coil unit |
| US10460870B2 (en) | 2016-06-11 | 2019-10-29 | Ningbo Weie Electronics Technology Ltd. | Induction coil assembly and wireless power transfer system |
| US10650964B2 (en) | 2017-12-25 | 2020-05-12 | Ningbo Weie Electronics Technology Ltd. | Coil module, wireless power transmitting circuit and wireless power receiving circuit |
| CN111627675A (en) * | 2019-02-27 | 2020-09-04 | Tdk株式会社 | Coil component |
-
2015
- 2015-01-15 CN CN201520036919.6U patent/CN204480870U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105845404A (en) * | 2015-01-15 | 2016-08-10 | 宁波微鹅电子科技有限公司 | Transmitting coil structure with high-quality factor and winding method thereof |
| CN105845404B (en) * | 2015-01-15 | 2017-12-12 | 宁波微鹅电子科技有限公司 | The transmitting coil structure and its winding method of a kind of high quality factor |
| CN108391457A (en) * | 2015-09-11 | 2018-08-10 | 扬科技术有限公司 | Utilize the wireless charging platform of three dimensional Phase coil array |
| CN108391457B (en) * | 2015-09-11 | 2022-08-02 | 扬科技术有限公司 | Wireless charging platform utilizing three-dimensional phase coil array |
| US10460870B2 (en) | 2016-06-11 | 2019-10-29 | Ningbo Weie Electronics Technology Ltd. | Induction coil assembly and wireless power transfer system |
| CN109643607A (en) * | 2016-09-28 | 2019-04-16 | 日本电产株式会社 | Non-contact power coil unit |
| CN109643607B (en) * | 2016-09-28 | 2021-01-12 | 日本电产株式会社 | Coil unit for non-contact power supply |
| CN106952710A (en) * | 2017-05-12 | 2017-07-14 | 福州大学 | A kind of wireless charging magnetic coupling arrangement and its circuit for multi-load |
| US10650964B2 (en) | 2017-12-25 | 2020-05-12 | Ningbo Weie Electronics Technology Ltd. | Coil module, wireless power transmitting circuit and wireless power receiving circuit |
| CN111627675A (en) * | 2019-02-27 | 2020-09-04 | Tdk株式会社 | Coil component |
| CN111627675B (en) * | 2019-02-27 | 2023-09-12 | Tdk株式会社 | Coil component |
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