CN111200318A - Wireless power transmission device - Google Patents

Wireless power transmission device Download PDF

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Publication number
CN111200318A
CN111200318A CN201811377796.7A CN201811377796A CN111200318A CN 111200318 A CN111200318 A CN 111200318A CN 201811377796 A CN201811377796 A CN 201811377796A CN 111200318 A CN111200318 A CN 111200318A
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China
Prior art keywords
coil
transmitting coil
wireless power
power transmission
transmission device
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CN201811377796.7A
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Chinese (zh)
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王珂
吴建新
高涛
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Wuxi China Resources Semico Co Ltd
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Wuxi China Resources Semico Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/006—Details of transformers or inductances, in general with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings

Abstract

The invention relates to a wireless power transmission device which comprises a transmitting coil and a receiving coil which are mutually coupled, wherein the transmitting coil is of a loose winding type structure, and the gap between adjacent wire turns in the transmitting coil is not less than 1mm, so that the coupling coefficient between the transmitting coil and the receiving coil is improved. The wireless power transmission device with the structure can effectively improve the coupling coefficient between the transmitting coil and the receiving coil, thereby improving the transmission efficiency of the whole wireless power transmission system.

Description

Wireless power transmission device
Technical Field
The invention relates to the field of electric energy transmission, in particular to the technical field of wireless electric energy transmission, and specifically relates to a wireless electric energy transmission device.
Background
With the development of science and technology, wireless power transmission technology is more and more widely applied, the coupling capability of the coupling coil has an important influence on wireless power transmission, and the design of the coupling coil becomes a key point for improving the wireless power transmission efficiency. In the prior art, a double-coil series-parallel connection mode is adopted to improve the coil coupling capacity, and the double-coil type coil structure is shown in fig. 1.
In the wireless power transmission system in the prior art, the coupling coil for transmitting power is generally designed to be a tightly-wound circular or round-corner rectangular structure, the size ratio of the coil to the magnetic shielding sheet is, for example, as shown in fig. 2 or 3, fig. 2 is an actual view of the circular tightly-wound coil structure, fig. 3 is an actual view of the round-corner rectangular tightly-wound coil structure, and there is almost no gap between adjacent turns in the tightly-wound coil, and the adjacent turns are in a fitting state. The selection of the transmitting end coil and the receiving end coil is generally selected from the existing coils according to the inductance value determined by the system design, and the selected existing coils can often meet the basic functional performance requirements of the system but are not coils with the best performance, namely the coupling coefficient between the transmitting coil and the receiving coil is poor.
Disclosure of Invention
The present invention is directed to overcoming at least one of the above-mentioned disadvantages of the prior art and providing a wireless power transmission device having a simple structure, a convenient manufacturing process, a high adaptability, and a good coupling coefficient between a transmitting coil and a receiving coil.
In order to achieve the above objects or other objects, a wireless power transmission apparatus of the present invention is as follows:
the wireless electric energy transmission device comprises a transmitting coil and a receiving coil which are coupled with each other, and is mainly characterized in that the transmitting coil is of a sparse winding structure, the gap between adjacent wire turns in the transmitting coil is not smaller than 1mm, the coupling coefficient between the transmitting coil and the receiving coil is improved, and the size of the receiving coil is not larger than that of the transmitting coil.
Preferably, the size ratio of the transmitting coil to the receiving coil is 4: 1.
preferably, the pitch of the transmitting coil is proportional to the number of turns of the transmitting coil.
Preferably, the pitch of the transmitting coil is larger than the radius of the transmitting coil.
Preferably, the number of turns of the transmitting coil is between 6 and 10 turns.
Preferably, the gap between adjacent turns in the transmitting coil gradually decreases from outside to inside, and the transmitting coil is of a structure with a sparse outside and a dense inside.
Preferably, the number of turns of the transmitting coil is 6.
Further, the gap between adjacent wire turns at the outermost layer in the transmitting coil is between 11mm and 15mm, and the gap of each layer is sequentially reduced by 1.5mm to 2.5mm inwards.
Furthermore, the gap between the adjacent wire turns at the outermost layer in the transmitting coil is 13mm, the gap of each layer is sequentially reduced by 2mm inwards, and the gap between the adjacent wire turns at the innermost layer is 3 mm.
By adopting the wireless power transmission device, the transmitting coil is in a loose winding type structure, and the gap between adjacent wire turns in the transmitting coil is not less than 1mm, so that the coupling coefficient between the transmitting coil and the receiving coil can be effectively improved, and the transmission efficiency of the whole wireless power transmission system is improved. The device has the advantages of simple structure, easy realization and better applicability.
Drawings
Fig. 1 is a schematic structural diagram of a coupling coil with a dual-coil series-parallel structure in the prior art.
Fig. 2 is a physical diagram of a prior art circular close-wound coil structure.
Fig. 3 is a physical diagram of a prior art rounded rectangular close-wound coil structure.
Fig. 4 is a schematic diagram of a prior art close-wound coil structure with rounded rectangles.
Fig. 5 is a schematic structural diagram of a transmitting coil according to an embodiment of the invention.
Fig. 6 is a schematic diagram of the magnetic field strength of a transmitting coil using a close-wound structure in the prior art.
Fig. 7 is a diagram showing the magnetic field intensity of a transmitting coil of a dual coil type according to the prior art.
Fig. 8 is a schematic diagram of magnetic field strength of a wireless power transmission device according to an embodiment of the invention.
Fig. 9 is a schematic view of magnetic lines of a transmitting coil adopting a close-wound structure in the prior art.
Fig. 10 is a schematic view of magnetic lines of force of a transmitting coil of a dual coil type in the prior art.
Fig. 11 is a schematic view of magnetic lines of force of a wireless power transmission device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to specific embodiments.
The wireless power transmission device comprises a transmitting coil and a receiving coil which are coupled with each other, wherein the transmitting coil is of a sparse winding structure, and the gap between adjacent wire turns in the transmitting coil is not less than 1mm, so that the coupling coefficient between the transmitting coil and the receiving coil is improved. The size of the receiving coil is not larger than that of the transmitting coil, and in the embodiment, the size ratio of the transmitting coil to the receiving coil is 4: 1.
the pitch of the transmitting coil is in equal proportion to the number of turns of the transmitting coil, and the number of turns increases along with the increase of the pitch.
In this embodiment, the pitch of the transmitter coil is greater than the radius of the transmitter coil,
generally, in a larger wireless power transmission device, the number of turns of the transmitting coil can be set between 6-10 turns, and in this embodiment, the number of turns of the transmitting coil is 6 turns.
The gap between adjacent wire turns in the transmitting coil is gradually reduced from outside to inside, and the transmitting coil is of a structure with sparse outside and dense inside; in this embodiment, the gap between the adjacent turns of the outermost layer in the transmitting coil is 13mm, the gap of each layer is sequentially reduced by 2mm inwards, the gap between the adjacent turns of the innermost layer is 3mm, and in other embodiments, when the number of turns of the transmitting coil is different, the distance between the turns can be adjusted accordingly. (the particular value of the turn gap in other embodiments may fluctuate within a certain range).
By adopting the transmitting coil in the prior art, higher requirements are placed on the arrangement of the receiving coil, and effective charging can be carried out only by aligning and arranging. By adopting the wireless power transmission device in the embodiment, since the transmitting coil is larger than the receiving coil, and the transmitting coil is provided with litz wires at the periphery and distributed with litz wires at the inner ring, the requirement for the placement position of the receiving coil during charging can be reduced except that the coupling coefficient between the transmitting coil and the receiving coil is improved under the condition of ensuring that the impedance of the transmitting coil is not changed during wireless power transmission, and the receiving coil can be effectively charged when placed at any position on the transmitting coil.
In the wireless power transmission device in the above embodiment, the transmitting coil is made into the sparse winding structure without changing the receiving coil in the prior art, and by such a structure, the coupling coefficient between the transmitting coil and the receiving coil is improved, so that the efficiency of the wireless power transmission system including the wireless power transmission device in the present invention is improved, and the problems of the leakage inductance phenomenon of the hollow coil itself and the rapid decrease of the coupling capability between the coils during long-distance transmission are solved.
The applicant found through a large number of experiments: in a wireless power transmission system, a transmitting coil and a receiving coil which are used for coupling and transmitting energy influence the coupling capacity between the transmitting coil and the receiving coil except that the inner and outer diameter sizes, the working frequency, the magnetic conductive medium and the like of the two coils, and the design of dense and dense winding of the coils is also one of important influence factors influencing the coupling capacity of the two coils.
Without special treatment of the receiver coil, the transmitter coil is made as a close-wound coil structure as shown in fig. 4 and a loosely wound coil structure in an embodiment of the present invention as shown in fig. 5, respectively, without changing the length of the litz wire used to make the transmitter coil. The pitch of the transmitting coil of the close-wound structure in fig. 4 is 0.1mm at most, and the size of the radius of the transmitting coil of the close-wound structure is much larger than that of the pitch. While the length of the ferromagnetic wire used for the transmitting coil of the loose-wound structure in fig. 5 is the same as that of the transmitting coil of the close-wound structure in fig. 4, the pitch of the transmitting coil of the loose-wound structure is larger than the radius of the transmitting coil, and the pitches are sequentially decreased inwards according to a certain proportion. The sparse winding structure can effectively improve the coupling coefficient between the transmitting coil and the receiving coil.
The effectiveness of the wireless power transmission device is proved by combining simulation experiment data.
In the simulation process, electromagnetic field calculation in engineering is converted into a huge matrix solution. The finite element analysis method is a method for obtaining a geometric body by converting some complex problems of an electromagnetic field into edge values of partial differential equations, dividing a solving area into finite elements, wherein the finite elements are collectively called 'finite elements', establishing a matrix equation for each finite element, giving edge value conditions, and finally combining the results of each finite element, and specifically comprises the following steps:
(1) first, a variation of conditions is performed as shown in the following formula (1):
Figure BDA0001871165170000041
wherein W represents energy, AzDenotes a vector magnetic field, Az0Represents a cell, μ represents permeability, HzIs the magnetic field strength, JzDenotes the current density, S1And S2Respectively representing a first type of boundary and a second type of boundary.
(2) Then, cell subdivision is carried out, and the cell subdivision uses a linear interpolation function formula (2) to express the magnetic potential of any point in each subdivided cell:
Figure BDA0001871165170000042
wherein a, b and c are constants, ai、bi、ci、aj、bj、cj、am、bm、cmMagnetic bit coordinates for representing different nodes, respectively, in equation (2):
Figure BDA0001871165170000043
Figure BDA0001871165170000044
wherein, Xj、Xm、Xi、yi、ym、yjCoordinate values of unit vectors respectively representing different nodes; a. thezi、Azj、Azm、(xi,yi)、(xj,yj)、(xm,ym) Respectively corresponding to the magnetic bit vectors and coordinates at the nodes i, j and m.
Figure BDA0001871165170000051
Wherein N isi、Nj、NmRespectively, the magnetic bit vectors of different node positions.
Wherein the content of the first and second substances,
Az＝Ni(x,y)Azi+Nj(x,y)Azj+Nm(x,y)Azm(6)；
wherein, two magnetic density values B of the magnetic potential of any pointxThe components can be obtained by:
Figure BDA0001871165170000052
(3) then, cell analysis is performed according to the above formula, i.e. for each of the obtained divisionsAnalyzing each cell to obtain the energy P of three magnetic bit nodesi、Pj、PmExpression (c):
Figure BDA0001871165170000053
(4) and finally, carrying out comprehensive treatment on the cells, and combining the solution results of all the cells to obtain a total energy expression of the solution system:
Figure BDA0001871165170000054
the special time with the system energy value of 0 is selected for solving, and a coupling coefficient k and a vector magnetic field A can be obtainedzAnd the total energy p as follows:
[k]{Az}＝{p} (10)
according to the above formula, a schematic diagram of the magnetic field strength and a schematic diagram of the magnetic force line can be obtained through simulation, wherein fig. 6 is a schematic diagram of the magnetic field strength of a transmitting coil adopting a close-wound structure in the prior art, fig. 7 is a schematic diagram of the magnetic field strength of a transmitting coil adopting a double-coil structure in the prior art, and fig. 8 is a schematic diagram of the magnetic field strength of a wireless power transmission device adopting the present invention. Fig. 9 is a schematic view of magnetic lines of force of a transmitting coil adopting a close-wound structure in the prior art, fig. 10 is a schematic view of magnetic lines of force of a transmitting coil adopting a double-coil structure in the prior art, and fig. 11 is a schematic view of magnetic lines of force of a wireless power transmission device adopting the present invention. It can be seen from fig. 6 and 7 that when the transmitting coil and the receiving coil of the close-wound structure are used under the condition that the distance between the transmitting coil and the receiving coil is the same, the electric field between the transmitting coil and the receiving coil is only larger in the magnetic field intensity around the two coils, and the magnetic field intensity is very weak or even not at the position between the transmitting coil and the receiving coil, which indicates that the coupling capability between the transmitting coil and the receiving coil is very weak when the transmitting coil of the close-wound structure or the transmitting coil of the double-coil structure is used. As can be seen from fig. 8, when the distance between the transmitting coil and the receiving coil is kept unchanged, and the wireless power transmission device of the present invention is adopted, the magnetic field distribution between the transmitting coil and the receiving coil is uniform, the magnetic field strength between the transmitting coil and the receiving coil is obviously stronger than that when a close-wound transmitting coil or a dual-coil transmitting coil is adopted, and the coupling capability between the transmitting coil and the receiving coil is stronger.
The same conclusion can be seen from the magnetic force line diagrams in fig. 9 to fig. 11, and the magnetic force line in fig. 11 is significantly stronger than the magnetic force line in the transmitting coil adopting the close-wound structure or the transmitting coil adopting the double-coil structure, which also proves that the coupling capability between the transmitting coil and the receiving coil is stronger when the transmitting coil adopting the open-wound structure in the wireless power transmission device of the present invention is adopted than the coupling capability between the two coils when the close-wound coil or the double-coil structure is adopted in the prior art under the condition that the size of the receiving coil is kept unchanged.
The difference in coupling coefficient between the present solution and the prior art can be seen more intuitively from the following table:
Figure BDA0001871165170000061
by adopting the wireless power transmission device, the transmitting coil is arranged in a loose winding type structure, so that the coupling coefficient between the transmitting coil and the receiving coil can be effectively improved, and the transmission efficiency of the whole wireless power transmission system is improved. The device has the advantages of simple structure, easy realization and better applicability.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (9)

1. A wireless power transmission device comprises a transmitting coil and a receiving coil which are coupled with each other, and is characterized in that the transmitting coil is of a loose-winding structure, the gap between adjacent turns in the transmitting coil is not less than 1mm, the gap is used for improving the coupling coefficient between the transmitting coil and the receiving coil, and the size of the receiving coil is not more than that of the transmitting coil.
2. The wireless power transfer apparatus of claim 1, wherein the size ratio of the transmitting coil to the receiving coil is 4: 1.
3. the wireless power transmission apparatus according to claim 1, wherein the pitch of the transmitting coil is proportional to the number of turns of the transmitting coil.
4. The wireless power transfer apparatus of claim 3, wherein the pitch of the transmitter coil is greater than the radius of the transmitter coil.
5. The wireless power transmission device according to claim 1, wherein the number of turns of the transmitting coil is between 6 and 10 turns.
6. The wireless power transmission device as claimed in claim 1, wherein the gap between adjacent turns of the transmitting coil is gradually decreased from outside to inside, and the transmitting coil has a structure with a sparse outside and a dense inside.
7. The wireless power transfer apparatus of claim 7 wherein the transmitter coil has 6 turns.
8. The wireless power transmission device as claimed in claim 8, wherein the gap between the outermost adjacent turns of the transmitting coil is between 11mm and 15mm, and the gap of each layer is sequentially reduced inward by 1.5mm to 2.5 mm.
9. The wireless power transmission device as claimed in claim 8, wherein the gap between the adjacent turns of the outermost layer of the transmitting coil is 13mm, the gap of each layer is sequentially decreased by 2mm inward, and the gap between the adjacent turns of the innermost layer is 3 mm.
CN201811377796.7A 2018-11-19 2018-11-19 Wireless power transmission device Pending CN111200318A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201868561U (en) * 2010-09-14 2011-06-15 北京握奇数据系统有限公司 Antenna and device provided with same
US8338990B2 (en) * 2008-03-13 2012-12-25 Access Business Group International Llc Inductive power supply system with multiple coil primary
CN103534772A (en) * 2011-05-19 2014-01-22 索尼公司 Power supply device, power supply system, and electronic device
CN104637658A (en) * 2013-11-11 2015-05-20 三星电机株式会社 Non-contact type power transmitting coil and non-contact type power supplying apparatus
CN104701995A (en) * 2013-12-07 2015-06-10 英特尔公司 Non-uniform spacing in wireless resonator coil
CN204425057U (en) * 2015-03-13 2015-06-24 喻易强 Based on the magnetic field equal distribution type radio energy transmission system of magnetic resonance coupling
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
CN108110903A (en) * 2017-12-14 2018-06-01 中南大学 A kind of gradually wide structural model and optimization method for gradually opening spiral PCB resonance coils
CN108717170A (en) * 2018-05-25 2018-10-30 中国医学科学院生物医学工程研究所 Change spacing mosquito-repellent incense-shaped coil for the excitation of magnetic inductive magnetosonic imaging magnetic field

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8338990B2 (en) * 2008-03-13 2012-12-25 Access Business Group International Llc Inductive power supply system with multiple coil primary
CN201868561U (en) * 2010-09-14 2011-06-15 北京握奇数据系统有限公司 Antenna and device provided with same
CN103534772A (en) * 2011-05-19 2014-01-22 索尼公司 Power supply device, power supply system, and electronic device
CN104637658A (en) * 2013-11-11 2015-05-20 三星电机株式会社 Non-contact type power transmitting coil and non-contact type power supplying apparatus
CN104701995A (en) * 2013-12-07 2015-06-10 英特尔公司 Non-uniform spacing in wireless resonator coil
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
CN204425057U (en) * 2015-03-13 2015-06-24 喻易强 Based on the magnetic field equal distribution type radio energy transmission system of magnetic resonance coupling
CN108110903A (en) * 2017-12-14 2018-06-01 中南大学 A kind of gradually wide structural model and optimization method for gradually opening spiral PCB resonance coils
CN108717170A (en) * 2018-05-25 2018-10-30 中国医学科学院生物医学工程研究所 Change spacing mosquito-repellent incense-shaped coil for the excitation of magnetic inductive magnetosonic imaging magnetic field

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