CN106941283A - Wireless power transmission coil device based on displacement flat board - Google Patents
Wireless power transmission coil device based on displacement flat board Download PDFInfo
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- CN106941283A CN106941283A CN201710225015.1A CN201710225015A CN106941283A CN 106941283 A CN106941283 A CN 106941283A CN 201710225015 A CN201710225015 A CN 201710225015A CN 106941283 A CN106941283 A CN 106941283A
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- flat board
- magnetic shift
- coil
- magnetic
- power transmission
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- 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
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- Near-Field Transmission Systems (AREA)
Abstract
A kind of wireless power transmission coil device based on displacement flat board that the present invention is provided, including transmitting coil, receiving coil, negative magnetic shift flat board and positive magnetic shift flat board；Wherein described negative magnetic shift flat board is located between the transmitting coil and the receiving coil, and the positive magnetic shift flat board is located on the outside of the transmitting coil or the receiving coil.Compared with prior art, beneficial effects of the present invention are as follows：1st, the present invention can move Inside coil to Approximate Equivalent in electromagnetic field, so as to change the relative position between transmitting coil and receiving coil, significantly strengthen mutual inductance and the magnetic coupling of transmitting coil and receiving coil.2nd, compact conformation of the present invention, can be according to application demand selection index system in transmitting coil or receiving coil；It is more notable to mutual inductance and magnetic-coupled enhancing effect when acting on two coils simultaneously.3rd, the present invention is simple in construction, it is easy to accomplish, have broad application prospects.
Description
Technical field
The present invention relates to electromagnetic design field and wireless power transmission technology, in particular it relates to based on displacement flat board (can
Effective enhancing magnetic coupling effect) wireless power transmission coil device.
Background technology
In recent years, wireless power transmission technology received more and more extensive concern.Traditional electric energy transmission mainly passes through gold
Belong to the point-to-point directly contact transmission of wire.The transmission means of this " wired " brings many problems.Rubbed, always due to existing
It is easy to produce spark in the problems such as change, electric energy transmitting procedure, and then has influence on life-span and the Electrical Safety of electrical equipment.Separately
Outside, the need for traditional corded power transmission means can not meet some particular applications, such as mine, in water, implanted doctor
Treat equipment etc..These problems are all calling a kind of electric energy transmission means for departing from plain conductor, i.e. wireless power transmission.Radio
Can transmission technology relate to Power Electronic Circuit, coil electromagnetism design, automatically control, the aspects of contents such as communication protocol, wherein
Coil electromagnetism design is particularly important.
Meta Materials are that a kind of dielectric constant or magnetic conductivity are negative artificial structure's material.It can be realized to electricity using Meta Materials
The control in magnetic field.Nearly ten years, domestic and foreign scholars have gone out various feature Meta Materials using transform optics Theoretical Design
Electromagnetic device, including " perfect prism ", stealthy cape, electromagnetic absorber, super scattering object etc..Displacement medium is a kind of special surpasses
Material devices, object or region that it can act on medium are optically equivalent to be displaced to specified location.Uniformly, isotropism
Meta Materials can utilize the sub-wavelength structure of periodic arrangement, such as split ring resonator is realized.
Short-distance and medium-distance wireless power transmission uses near field magnetic coupling mode mostly, however, with transmitting coil and receiving coil it
Between transmission range increase, the electric energy efficiency of transmission of system drastically declines.Existing research mostly by Optimization Design on Coil and
Control algolithm is improved to solve this problem, but the above method can not change the evanescent wave characteristic in magnetic field between coil, therefore to effect
Rate enhancing effect is limited.Meta Materials make it show great potential in wireless power transmission field to the control action of electromagnetic field.
Existing research is mostly based on " magnetic perfection prism "." magnetic perfection prism " is the metamaterial flat that magnetic conductivity is -1, and it can
Converged again with the magnetic field for producing transmitting coil, so as to strengthen the mutual inductance between transmitting coil and receiving coil and magnetic coupling.So
And, in order to realize farther transmission range, it usually needs further increase the thickness of flat board, device is become heavier.And
And, flat board is normally placed at the position in the middle of two coils, can be because overcoupling makes effect substantially weaken when flat board is close to coil, this
Also it greatly limit its application scenario.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of radio energy biography based on displacement flat board
Defeated coil device.
In order to solve the above technical problems, a kind of wireless power transmission coil dress based on displacement flat board that the present invention is provided
Put, including transmitting coil, receiving coil, negative magnetic shift flat board and positive magnetic shift flat board；Wherein described negative magnetic shift is put down
Plate is located between the transmitting coil and the receiving coil, and the positive magnetic shift flat board is located at the transmitting coil or described
On the outside of receiving coil.
Preferably, the distance between the transmitting coil and the receiving coil are more than the transmitting coil and the reception
The diameter of coil.
Preferably, the positive magnetic shift flat board and the negative magnetic shift flat board are each parallel to the transmitting coil and institute
State plane where receiving coil.
Preferably, the positive magnetic shift flat board and the negative magnetic shift flat board and the transmitting coil and the reception
Coil is coaxially disposed.
Preferably, the positive magnetic shift flat board and the distance between the transmitting coil are flat equal to the negative magnetic shift
The distance between plate and the transmitting coil；Or the distance between the positive magnetic shift flat board and the receiving coil are equal to institute
State the distance between negative magnetic shift flat board and described receiving coil.
Preferably, the positive magnetic shift flat board and the negative magnetic shift flat board are size identical square.
Preferably, the full-size of the positive magnetic shift flat board and the negative magnetic shift flat board is less than operation wavelength
1/10th.
Preferably, the length of side of the positive magnetic shift flat board and the negative magnetic shift flat board be more than the transmitting coil with
The diameter of the receiving coil.
Preferably, the magnetic conductivity parameter μ of the negative magnetic shift flat board1Join with the magnetic conductivity of the positive magnetic shift flat board
Number μ2Meet respectively：
Wherein, w is the thickness of the positive magnetic shift flat board or the negative magnetic shift flat board, and d moves for the positive magnetic
Position flat board and negative magnetic shift flat board collective effect, make the distance of Inside coil optically equivalent movement.
Preferably, the permeability tensor μ ' of the negative magnetic shift flat boardIMeet：
μ‘I=μI*(1+σN*i)；
Wherein, σNFor the loss factor of the negative magnetic shift flat board；I is imaginary part unit；σN* i is the magnetic loss of material；
μIFor the preferable permeability tensor of the negative magnetic metamaterial flat,
The permeability tensor μ ' of the positive magnetic shift flat boardIIMeet：
μ‘II=μII*(1-σP*i)；
Wherein, σPFor the loss factor of the positive magnetic shift flat board；I is imaginary part unit；σP* i is the magnetic loss of material；
μIIFor the preferable permeability tensor of the positive magnetic metamaterial flat,
Compared with prior art, beneficial effects of the present invention are as follows：
1st, wireless power transmission coil device of the present invention based on displacement flat board can be moved to Approximate Equivalent in electromagnetic field
Dynamic Inside coil, so as to change the relative position between transmitting coil and receiving coil, significantly strengthens transmitting coil and reception
The mutual inductance of coil and magnetic coupling.
2nd, wireless power transmission coil device compact conformation of the present invention based on displacement flat board, can be selected according to application demand
Select and act on transmitting coil or receiving coil；When acting on two coils simultaneously, mutual inductance and magnetic-coupled enhancing effect are more shown
Write.
3rd, wireless power transmission coil device of the present invention based on displacement flat board is simple in construction, it is easy to accomplish, with wide
Application prospect.
Figure of description
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature mesh of the invention
And advantage will become more apparent upon.
Fig. 1 is structure chart of the present invention based on the wireless power transmission coil device embodiment one for shifting flat board；
Fig. 2 is the structure chart of traditional wireless power transmission coil device；
Fig. 3 is the Distribution of Magnetic Field figure of the wireless power transmission coil device embodiment one based on displacement flat board；
Fig. 4 is the Distribution of Magnetic Field figure of traditional wireless power transmission coil device；
Fig. 5 is the Distribution of Magnetic Field figure of the wireless power transmission coil device embodiment two based on displacement flat board；
Fig. 6 is the Distribution of Magnetic Field figure of the wireless power transmission coil device embodiment three based on displacement flat board.
In figure：
1- transmitting coil 2- receiving coils 3- bears magnetic shift flat board
The positive magnetic shift flat boards of 4-
Embodiment
Using specific embodiment, the present invention is described in detail below.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, some changes and improvements can also be made.These belong to the present invention
Protection domain.
A kind of wireless power transmission coil device based on displacement flat board that the present invention is provided, including：Transmitting coil 1, connect
Take-up circle 2, negative magnetic shift flat board 3, positive magnetic shift flat board 4, negative magnetic shift flat board 3 are placed on transmitting coil 1 and reception
Between coil 2, positive magnetic shift flat board 4 is placed on transmitting coil 1 or the outside of receiving coil 2.
The distance between transmitting coil 1 and receiving coil 2 are respectively greater than transmitting coil 1, the diameter of receiving coil 2.
The positive magnetic shift flat board 4 and negative magnetic for being close to a coupling coil (transmitting coil 1 or receiving coil 2) placement are moved
Position flat board 3 constitutes a positive magnetic shift flat board 4 shifted in flat board group, same displacement flat board group, negative magnetic shift flat board 3
Each parallel to the coupling coil, and with the coupling coil coaxial placement, the displacement flat board section parallel with the coupling coil is just
Square, positive magnetic shift flat board 4 and negative magnetic shift flat board 3 in same displacement flat board group arrive the distance phase of the coupling coil
Together.
Negative magnetic material is uniform, coaxial, z-axis to magnetic conductivity be μ1, x-axis and y-axis to magnetic conductivity be 1/ μ1, μ1It is negative
Value；Positive magnetic material is uniform, coaxial, z-axis to magnetic conductivity be μ2, x-axis and y-axis to magnetic conductivity be 1/ μ2, μ2For on the occasion of；Z-axis
Direction refers to the direction that the center of receiving coil 2 is pointed to by the center of transmitting coil 1, i.e. axis direction, and x-axis, y-axis direction are that displacement is flat
The length of side direction of plate square section, the origin of coordinates is the central point of transmitting coil 1 or receiving coil 2.
Displacement flat board group can in electromagnetic field in the axial direction by transmitting coil 1 or receiving coil 2 move it is certain away from
From d；And d>A, a represent Inside coil with shifting the distance between flat board.Be equivalent to displacement flat board group can by Inside coil from
Optically approximately it is moved to the position specified outside flat board group.This displacement effect realizes that Meta Materials parameter is sharp by Meta Materials
Calculated and obtained with transform optics, can be it is anticipated that result modulated electromagnetic wave using the Meta Materials of the special parameter.In the present invention
In, displacement flat board group can change transmitting coil 1 and relative position of the receiving coil 2 in electromagnetic field.It therefore, it can keeping
In the case that transmitting coil 1 and the physical distance of receiving coil 2 are constant, further both are equivalent in electromagnetic field, so as to strengthen two
The degree of coupling of coil, wireless power transmission efficiency is improved in the case where not changing transmission range.
The size of positive magnetic shift flat board 4 and negative magnetic shift flat board 3 can be according to needing mobile line in practical application
The size flexible design of circle, but the full-size of positive magnetic shift flat board 4 and negative magnetic shift flat board 3 need to be met less than operating wave
Long 1/10th.
The magnetic conductivity parameter μ of positive magnetic shift flat board 4 and negative magnetic shift flat board 31、μ2By the width w and coupling of displacement flat board
The translocation distance d of zygonema circle is together decided on, and is specifically represented by formula
The loss factor for considering negative magnetic shift flat board 3 is σN, i.e. μ 'I=μI*(1+σN* i), positive magnetic shift flat board 4
Loss factor is σP, i.e. μ 'II=μII*(1-σP* i), keep other specification constant, it is expected that the translocation distance d reached is bigger, to mutual
The enhancing effect of sense is more obvious；There is threshold value in the length of side h of displacement flat board, during less than the threshold value, mutual inductance increases with h increase
Plus, varied less more than mutual inductance after the threshold value with h increase, and the threshold value is more than the diameter of coil.Wherein, μ 'IRepresent to consider
The permeability tensor of the negative magnetic metamaterial flat of magnetic loss, μ 'IIRepresent the magnetic of the positive magnetic metamaterial flat of consideration magnetic loss
Conductance tensor, i represents the magnetic loss of imaginary part, i.e. material, μIFor the preferable permeability tensor of the negative magnetic metamaterial flat：μIIFor the preferable permeability tensor of the positive magnetic metamaterial flat：
In order to ensure that negative magnetic shift flat board 3 can be realized with split ring resonator, the magnetic conductivity parameter of magnetic shift flat board 3 is born
μ1Span be [- 10, -0.1].
Position and direction of the coupling coil between displacement flat board group do not influence to shift flat board group to the overall shifting of coupling coil
Position distance, displacement flat board group can produce same displacement effect when being respectively acting on transmitting coil 1 and receiving coil 2.
Embodiment 1：
As shown in figure 1, the implementation case provides a kind of wireless power transmission coil device based on displacement flat board, emission lines
Circle 1, receiving coil 2, negative magnetic shift flat board 3, positive magnetic shift flat board 4.The wherein radius of transmitting coil 1 and receiving coil 2
0.15m is, coil section radius is 0.002m, and the number of turn of coil is 1；Negative magnetic shift flat board 3 is placed on emission lines
Between circle 1 and receiving coil 2, positive magnetic shift flat board 4 is placed on the outside of transmitting coil 1；And the central point of transmitting coil 1
The distance between central point of (origin O) and receiving coil 2 is 1m, shifts the size of flat board group for a=0.14m, w=0.15m,
H=1.3m, as shown in figure 1, the translocation distance d of design is 0.5m, calculating obtains negative magnetic shift flat board 3 and positive magnetic shift is flat
The magnetic conductivity of plate 4 is as shown in table 1.
Table 1
| Direction | X-axis | Y-axis | Z-axis |
| Negative magnetic shift flat board magnetic conductivity | -2.33 | -2.33 | -0.43 |
| Positive magnetic shift flat board magnetic conductivity | 4.33 | 4.33 | 0.23 |
Multiple coupled physical field simulation software Comsol Multiphysics can be carried out to electromagnetic component in real system
Emulation, the simulation software has obtained the accreditation of many researchers and widely used.In order to verify the present invention provide based on
The effect of the wireless power transmission coil device of flat board is shifted, Electromagnetic Simulation is carried out by Comsol, transmitting coil 1 is calculated with connecing
Mutual inductance between take-up circle 2, and the magnetic field distribution figure of drawing system.
For above-mentioned parameter, the wireless power transmission coil device based on displacement flat board provided using the present invention is kept
The position of transmitting coil 1 and receiving coil 2 is constant, mutual between transmitting coil 1 and receiving coil 2 as translocation distance d=0.5m
Sense is about 5.03nH, and magnetic field distribution is as shown in Figure 3.
The structure chart of traditional wireless power transmission coil device as shown in Fig. 2 in order to verify that the present invention provides based on
Remarkable result of the wireless power transmission coil device of Meta Materials on mutual inductance and magnetic coupling is improved, it is ensured that transmitting coil 1 and connect
The size of take-up circle 2 is constant, and the distance between two coils are 1m.Using traditional wireless power transmission coil device, transmitting
Mutual inductance between coil 1 and receiving coil 2 is about 0.76nH, and magnetic field distribution is as shown in Figure 4.
Embodiment 2：
The wireless power transmission coil device based on displacement flat board of the implementation case, including transmitting coil 1, receiving coil
2nd, magnetic shift flat board 3, positive magnetic shift flat board 4 are born, displacement flat board group is placed on the both sides of receiving coil 2.Other specification with
It is identical in embodiment 1.
For above-mentioned parameter, the wireless power transmission coil device based on displacement flat board provided using embodiment 2, transmitting
Mutual inductance between coil 1 and receiving coil 2 is about 5.03nH, and magnetic field distribution is as shown in Figure 5.
Embodiment 3：
The wireless power transmission coil device based on displacement flat board of the implementation case, including transmitting coil 1, receiving coil
2nd, one group shifts flat board group, one group of displacement flat board group close to receiving coil 2 close to transmitting coil 1.Other specification with reality
Apply identical in example 1,2.Embodiment 3 can be interpreted as to the change case of embodiment 1.
For above-mentioned parameter, the wireless power transmission coil device based on magnetic material flat board provided using embodiment 3,
Mutual inductance between transmitting coil 1 and receiving coil 2 is about 49.63nH, and magnetic field distribution is as shown in Figure 6.
As can be seen that the wireless power transmission coil device based on magnetic material flat board that the present invention is provided, uses one group
Displacement flat board group acts on transmitting coil 1, compared with traditional wireless power transmission coil device, transmitting coil 1 and reception line
The mutual inductance of circle 2 is increased to original 6.62 times；When other conditions are identical, displacement flat board group is acted on into receiving coil 2, mutual inductance
Enhancing effect is consistent；When other conditions are identical, using two groups of displacement flat board groups, one group acts on transmitting coil 1, and one group acts on
Receiving coil 2, compared with traditional wireless power transmission coil device, the mutual inductance of transmitting coil 1 and receiving coil 2 is increased to original
65 times come.The present apparatus improves mutual inductance and magnetic-coupled effect highly significant, thus can significantly increase whole radio energy
The efficiency of transmission of Transmission system.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or change within the scope of the claims, this not shadow
Ring the substance of the present invention.In the case where not conflicting, feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (10)
1. a kind of wireless power transmission coil device based on displacement flat board, it is characterised in that including transmitting coil, receive line
Circle, negative magnetic shift flat board and positive magnetic shift flat board；Wherein
The negative magnetic shift flat board is located between the transmitting coil and the receiving coil, the positive magnetic shift flat board position
On the outside of the transmitting coil or the receiving coil.
2. the wireless power transmission coil device according to claim 1 based on displacement flat board, it is characterised in that the hair
The distance between ray circle and the receiving coil are more than the diameter of the transmitting coil and the receiving coil.
3. it is according to claim 1 based on displacement flat board wireless power transmission coil device, it is characterised in that it is described just
Magnetic shift flat board and the negative magnetic shift flat board are each parallel to plane where the transmitting coil and the receiving coil.
4. it is according to claim 1 based on displacement flat board wireless power transmission coil device, it is characterised in that it is described just
Magnetic shift flat board and the negative magnetic shift flat board are coaxially disposed with the transmitting coil and the receiving coil.
5. it is according to claim 1 based on displacement flat board wireless power transmission coil device, it is characterised in that it is described just
The distance between magnetic shift flat board and the transmitting coil are equal between negative the magnetic shift flat board and the transmitting coil
Distance；Or
The distance between the positive magnetic shift flat board and described receiving coil connect equal to the negative magnetic shift flat board with described
The distance between take-up circle.
6. it is according to claim 1 based on displacement flat board wireless power transmission coil device, it is characterised in that it is described just
Magnetic shift flat board and the negative magnetic shift flat board are size identical square.
7. it is according to claim 6 based on displacement flat board wireless power transmission coil device, it is characterised in that it is described just
The full-size of magnetic shift flat board and the negative magnetic shift flat board is less than 1/10th of operation wavelength.
8. it is according to claim 6 based on displacement flat board wireless power transmission coil device, it is characterised in that it is described just
The length of side of magnetic shift flat board and the negative magnetic shift flat board is more than the diameter of the transmitting coil and the receiving coil.
9. the wireless power transmission coil device according to claim 1 based on displacement flat board, it is characterised in that described negative
The magnetic conductivity parameter μ of magnetic shift flat board1With the magnetic conductivity parameter μ of the positive magnetic shift flat board2Meet respectively：
Wherein, w is the thickness of the positive magnetic shift flat board or the negative magnetic shift flat board, and d is flat for the positive magnetic shift
Plate and negative magnetic shift flat board collective effect, make the distance of Inside coil optically equivalent movement.
10. the wireless power transmission coil device according to claim 9 based on displacement flat board, it is characterised in that described
The permeability tensor μ ' of negative magnetic shift flat boardIMeet：
μ‘I=μI*(1+σN*i)；
Wherein, σNFor the loss factor of the negative magnetic shift flat board；I is imaginary part unit；σN* i is the magnetic loss of material；μIFor
The preferable permeability tensor of the negative magnetic metamaterial flat,
The permeability tensor μ ' of the positive magnetic shift flat boardIIMeet：
μ‘II=μII*(1-σP*i)；
Wherein, σPFor the loss factor of the positive magnetic shift flat board；I is imaginary part unit；σP* i is the magnetic loss of material；μIIFor
The preferable permeability tensor of the positive magnetic metamaterial flat,
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| CN201710225015.1A CN106941283A (en) | 2017-04-07 | 2017-04-07 | Wireless power transmission coil device based on displacement flat board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710225015.1A CN106941283A (en) | 2017-04-07 | 2017-04-07 | Wireless power transmission coil device based on displacement flat board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300493A (en) * | 2021-05-31 | 2021-08-24 | 桂林电子科技大学 | Magnetic coupling resonant wireless power transmission system based on electromagnetic metamaterial |
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| CN106160255A (en) * | 2016-07-04 | 2016-11-23 | 上海交通大学 | Wireless power transmission coil device based on Meta Materials |
| CN106298212A (en) * | 2016-08-15 | 2017-01-04 | 上海交通大学 | Wireless power transmission coil device based on magnetic material flat board |
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2017
- 2017-04-07 CN CN201710225015.1A patent/CN106941283A/en active Pending
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| US20090033586A1 (en) * | 2005-03-02 | 2009-02-05 | Atsushi Sanada | Negative pemeability or negative permittivity meta material and surface wave waveguide |
| CN103337916A (en) * | 2013-06-24 | 2013-10-02 | 南阳防爆电气研究所有限公司 | Wireless electric energy transmitting device based on low-frequency combined electromagnetic metamaterial |
| CN106160255A (en) * | 2016-07-04 | 2016-11-23 | 上海交通大学 | Wireless power transmission coil device based on Meta Materials |
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Application publication date: 20170711 |