CN103296776A - Wireless energy transmission system - Google Patents
Wireless energy transmission system Download PDFInfo
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- CN103296776A CN103296776A CN2012100516904A CN201210051690A CN103296776A CN 103296776 A CN103296776 A CN 103296776A CN 2012100516904 A CN2012100516904 A CN 2012100516904A CN 201210051690 A CN201210051690 A CN 201210051690A CN 103296776 A CN103296776 A CN 103296776A
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Abstract
The invention provides a wireless energy transmission system. By means of the fact that resonance coils of a magnetic resonance transmitting module and a magnetic resonance receiving module of the wireless energy transmission system are designed to be plane conductive coils spirally wound according to the Archimedes helical line, and by means of regulation of parameter setting of the Archimedes helical line, the inherent frequency of the plane conductive coils can be accurately regulated on a large scale, therefore, the inherent frequency of the plane conductive coils is completely matched with the working frequency of the system, and efficiency of energy transmission of the system can be improved greatly. According to the wireless energy transmission system, furthermore, a metamaterial having negative magnetic conductivity is installed between the magnetic resonance transmitting module and the magnetic resonance receiving module so that coupling of evanescent waves of a magnetic field can be enhanced, and transmission efficiency of the system can be improved further.
Description
[technical field]
The present invention relates to the wireless energy transfer field, relate to a kind of wireless energy transfer system based on the magnetic resonance principle particularly.
[background technology]
At present, wireless energy transmission technology is mainly based on three kinds of principles, be respectively induction, magnetic resonance formula and radiant type, the essential characteristic of induction (non-contact induction type) electric energy transmission circuit is that former secondary circuit separates, one section space is arranged between former limit circuit and the secondary circuit, interrelate by the magnetic field inductive coupling.Induction characteristics are: have than air gaps to exist, make former secondary not have and electrically contact, remedied the inherent shortcoming of traditional contact electric energy; But, than the existence of air gaps also make system's leakage field and excitatory quite, even than excitatory height; Therefore, based on the reason of magnetic induction technology, the actual effectively charging space length between charge coil substrate and the receiving coil substrate is approximately 5mm, and the space length when between the two then can't carry out charging work when surpassing 5mm.
Magnetic resonance formula (claiming the WiTricity technology again) is by department of physics of the Massachusetts Institute of Technology (MIT), electronic engineering, computer science department, and the researcher of military Nai Mi technical research institute (Institute for Soldier Nanotechnologies) proposition.System adopts two identical resonance objects of natural frequency to produce very strong intercoupling, and energy is mutual between two articles, utilizes coil and places the plate condenser at two ends, forms resonant circuit jointly, realizes the wireless transmission of energy.In June, 2007, realized the transmission of the 60W electric power of 2 meters of distances from the researcher of the Massachusetts Institute of Technology by solenoid, they have adopted brand-new form of thinking, have adopted two copper coils that can realize resonating, rely on resonance to carry out the transmission of energy.Existing wireless energy transfer system based on magnetic resonance comprises signal exciting circuit, transmitting antenna, magnetic resonance transmitter module and is arranged on magnetic resonance receiver module, reception antenna and receiving circuit in the load equipment, magnetic resonance transmitter module and magnetic resonance receiver module are single turn or the multiturn copper coil of coiling, in actual applications, the natural frequency of copper coil often is difficult for regulating, and be difficult to equate fully with the system works frequency, thereby the system capacity efficiency of transmission is lower.
Radiant type is divided into radio wave formula, microwave mode, laser mode etc. again, as, Powercast company develops based on the radio wave formula can change into radio wave galvanic receiving system, can be the battery charge of different electronic installations in about 1 meter scope.Its shortcoming is that the energy that can transmit is little, is of limited application.
[summary of the invention]
Technical problem to be solved by this invention is: overcome the existing low shortcoming of resonant wireless energy transfer system system capacity efficiency of transmission, provide a kind of system capacity efficiency of transmission higher wireless energy transfer system.
The present invention realizes that the technical scheme that goal of the invention adopts is, a kind of wireless energy transfer system, comprise the magnetic signal transmitter module, the magnetic resonance transmitter module, magnetic resonance receiver module and energy receiver module, carry out the energy transmission by suddenly the die coupling of line of resonant fields between described magnetic resonance transmitter module and the described magnetic resonance receiver module, described energy receiver module and described magnetic resonance receiver module are coupled by the mode of electromagnetic induction, described energy receiver module connects load equipment so that electric energy to be provided, described magnetic resonance transmitter module and magnetic resonance receiver module are the plane conductive coil, described plane conductive coil is the spiral of Archimedes coil, and the natural frequency of two described plane conductive coils equates.
Better, described magnetic resonance transmitter module and magnetic resonance receiver module are provided with super material, and described super material has negative magnetoconductivity, and the respective frequencies of the super material under the described negative magnetoconductivity condition equates with the natural frequency of described plane conductive coil.
Better, the magnetic permeability of described super material is-1.
Better, described super material comprises medium substrate and the array a plurality of micro-structurals on medium substrate, and described micro-structural is magnetic micro-structure, and described medium substrate is dielectric material, and described micro-structural is electric conducting material.
Better, described magnetic micro-structure is the derived structure of split ring resonator or split ring resonator.
Better, described medium substrate is organic resin material or ceramic material.
Better, described magnetic signal transmitter module comprises radiating circuit and transmitting antenna, described radiating circuit is magnetic field resonant excitation circuit, and described magnetic field resonant excitation circuit produces the driving signal of particular job frequency, and described driving signal is launched by described transmitting antenna.
Better, described transmitting antenna is the annular copper coil of single turn.
Better, described energy receiver module comprises reception antenna and receiving circuit, and described receiving circuit is rectification circuit, and the power conversion that described rectification circuit receives described reception antenna is electric energy output.
Better, described reception antenna is the annular copper coil of single turn.
Better, the coil outer diameter of described transmitting antenna equals the external diameter of described plane conductive coil.
Better, the coil outer diameter of described reception antenna equals the external diameter of described plane conductive coil.
Better, two described plane conductive coils are wire coil, and two described planar metal coils are separately fixed on two non-magnetic substrates.
Better, described non-magnetic substrate is organic resin material.
The invention has the beneficial effects as follows:
1, by the resonance coil with the magnetic resonance transmitter module of wireless energy transfer system and magnetic resonance receiver module be designed to by the spiral of Archimedes spiral shell around the plane conductive coil, by regulating the parameter setting of spiral of Archimedes, can carry out accurately regulating on a large scale to the natural frequency of plane conductive coil easily, natural frequency and the system works frequency of plane conductive coil are mated fully, and then can improve the energy transmission efficiency of system significantly.
2, the present invention by the super material with negative magnetoconductivity is set, to add the coupling of high-intensity magnetic field disappearance ripple, can further improve the efficiency of transmission of system further between magnetic resonance transmitter module and magnetic resonance receiver module.
[description of drawings]
Fig. 1, the overall structure schematic diagram of wireless energy transfer system.
Fig. 2, the spiral of Archimedes structure chart.
Fig. 3, spill split ring structure chart.
Fig. 4, hexagonal apertures ring derived structure figure.
Fig. 5, the function characteristic curve diagram of magnetic permeability and external magnetic field frequency.
Fig. 6, the structure chart of annular copper coil.
[embodiment]
The present invention is described in detail below in conjunction with accompanying drawing.
The overall structure schematic diagram of wireless energy transfer system of the present invention is referring to accompanying drawing 1, comprise magnetic signal transmitter module 1, magnetic resonance transmitter module 2, magnetic resonance receiver module 3, energy receiver module 4 and super material 5, super material 5 is arranged between magnetic resonance transmitter module 2 and the magnetic resonance receiver module 3, carry out the energy transmission by suddenly the die coupling of line of resonant fields between magnetic resonance transmitter module 1 and the magnetic resonance receiver module 2, energy receiver module 4 is with 3 couplings of magnetic resonance receiver module and be connected the load equipment (not shown) so that electric energy to be provided.
Magnetic signal transmitter module 1 comprises radiating circuit 11 and transmitting antenna 12, applied environment difference according to wireless energy transfer system, adopt different magnetic field resonant excitation circuit can produce the ac signal of particular job frequency as radiating circuit 11, launch the driving signal of the field signal emission particular job frequency of characteristic frequency by the mode of feed by transmitting antenna 12 as driving signal with ac signal, this driving signal is the electromagnetic wave with characteristic frequency.
Magnetic resonance transmitter module 2 comprise by the spiral of Archimedes spiral shell around plane copper coil 21 and transmitting terminal substrate 22, magnetic resonance receiver module 3 comprise by the spiral of Archimedes spiral shell around plane copper coil 31 and receiving terminal substrate 32, plane copper coil 21 and 31 structure are identical, structure chart is referring to accompanying drawing 2, Archimedes spiral (having another name called archimedes curve), also claim " constant velocity spiral ", its mathematical definition is: moving point is made constant speed movement along a straight line, and this straight line is when doing rotatablely moving of isogonism speed with the axis of its orthogonal, the track of moving point on the Plane of rotation of this straight line.The standard polar equation of spiral of Archimedes: r (θ)=a+b (θ), in the formula:
B-spiral of Archimedes coefficient, represents that the increase (or reducing) in utmost point footpath when every rotation 1 is spent is measured by mm/ °;
θ-polar angle, unit is degree, total number of degrees that the expression spiral of Archimedes turns over;
The utmost point footpath of a-when θ=0 °, mm.
Change parameter a and will change spiral shape, distance between b control helical, it is constant usually.Archimedes spiral has two helicals, θ＞0, another θ＜0.Article two, helical connects smoothly at the limit place.Wherein one the upset 90 °/270 ° obtain its mirror image, be exactly another helical.
Plane of the present invention conductive coil be by copper cash by the spiral of Archimedes spiral shell around forming, wherein the distance between utmost point footpath when θ=0 ° of parameter b-spiral of Archimedes coefficient, θ-polar angle, a-, two the magnetic resonance plane conductive coils is variable, by changing above-mentioned variable, the resonance frequency that can make magnetic resonance transmitter module and magnetic resonance accept module satisfies the system works frequency.
When making, guarantee that two plane copper coils 21 and 31 are identical, make it to have identical natural frequency, simultaneously, arrange by the spiral of Archimedes parameter of adjusting the plane copper coil, can regulate the natural frequency of plane copper coil, make it to equal to drive the frequency of signal, and then produce resonance, carry out the energy transmission by suddenly the die coupling of line of resonant fields.
Among the present invention, for strengthening suddenly the die coupling of line of resonant fields, super material 5 is set between magnetic resonance transmitter module 2 and magnetic resonance receiver module 3, below super material is elaborated.
Super material belongs to a kind of artificial synthetic composite material, generally comprise medium substrate and the array a plurality of artificial micro-structural on medium substrate, medium substrate is dielectric material, artificial micro-structural is electric conducting material, by being magnetic micro-structure with artificial microstructure design, it is the derived structure that each artificial micro-structural (being commonly referred to as cell) is split ring structure or split ring, can make super material have the characteristic of negative magnetoconductivity in some frequency, because the derived structure of such split ring structure or split ring can equivalence be the LC resonant circuit, so can realize enhancing to magnetic field by the array of a plurality of magnetic micro-structures.Fig. 3, Fig. 4 have provided the structure chart of two kinds of magnetic micro-structures respectively, and Fig. 3 is spill split ring structure chart, and Fig. 4 is hexagonal apertures ring derived structure figure.Manufacturing for super material, prior art generally adopts the PCB processing technology, print out the array that the identical metallic copper magnetic micro-structure of a plurality of structures is formed at epoxy resin base plate, to form super material, by can change the resonance frequency of super material, the super material that obtains having different resonance frequencys to the cell size of metallic copper magnetic micro-structure, the structural design of magnetic micro-structure itself etc.
For produced super material, its magnetic permeability is the function with the external magnetic field frequency dependence, super material list reveals different magnetic permeabilitys under the different external magnetic field frequencies, the function characteristic curve diagram of its magnetic permeability and external magnetic field frequency is referring to accompanying drawing 5, among the figure, abscissa is that frequency, ordinate are magnetic permeability, and negative magnetoconductivity is in a band frequency scope of resonance peak back as seen from the figure.For super material, magnetic permeability is closely related for negative frequency band and resonance frequency, namely change along with the variation of super material resonances frequency, therefore by the adjusting to resonance frequency, the frequency that can satisfy under the negative magnetoconductivity condition is identical with the operating frequency of wireless energy transfer system.
For wireless energy transfer, because the energy transmission medium between magnetic resonance transmitter module 2 and the magnetic resonance receiver module 3 is air, for improving energy transmission efficiency, need to have good impedance matching between the super material 5 of design and the air, to reduce the reflection of energy, therefore, the present invention optimize magnetic permeability for-1 super material as the magnetic field enhance device.
Should be understood that what present embodiment adopted is the plane copper coil, as embodiment, the material that can conduct electricity such as argent, aluminium, various metal alloys etc. or other non-metallic conducting material such as conductive rubber, conductive plastics, conductivity ceramics etc.
As embodiment, transmitting antenna 12 and accept the annular copper coil that antenna 42 all can adopt single turn, the structure chart of annular copper coil is referring to accompanying drawing 6, as preferred implementation, transmitting antenna 12 and the external diameter of accepting antenna 42 equal the external diameter of plane conductive coil or suitable with the external diameter of plane conductive coil.
Particularly, plane copper coil as magnetic resonance emission or magnetic resonance reception can be separately fixed on the non-magnetic substrate, non-magnetic substrate can adopt organic resin material as the FR4 epoxy resin fiberglass substrate that is widely used in the PCB field, F4B substrate etc., according to the difference of applied environment, can also adopt the PS substrate that do not contain glass fibre, ceramic substrate etc.
In the above-described embodiments, only the present invention has been carried out exemplary description, but those skilled in the art can carry out various modifications to the present invention after reading present patent application under the situation that does not break away from the spirit and scope of the present invention.
Claims (14)
1. wireless energy transfer system, comprise the magnetic signal transmitter module, the magnetic resonance transmitter module, magnetic resonance receiver module and energy receiver module, carry out the energy transmission by suddenly the die coupling of line of resonant fields between described magnetic resonance transmitter module and the described magnetic resonance receiver module, described energy receiver module and described magnetic resonance receiver module are coupled by the mode of electromagnetic induction, described energy receiver module connects load equipment so that electric energy to be provided, it is characterized in that: described magnetic resonance transmitter module and magnetic resonance receiver module are the plane conductive coil, described plane conductive coil is the spiral of Archimedes coil, and the natural frequency of two described plane conductive coils equates.
2. wireless energy transfer system according to claim 1, it is characterized in that: described magnetic resonance transmitter module and magnetic resonance receiver module are provided with super material, described super material has negative magnetoconductivity, and the respective frequencies of the super material under the described negative magnetoconductivity condition equates with the natural frequency of described plane conductive coil.
3. wireless energy transfer system according to claim 1, it is characterized in that: the magnetic permeability of described super material is-1.
4. wireless energy transfer system according to claim 1, it is characterized in that: described super material comprises medium substrate and the array a plurality of micro-structurals on medium substrate, described micro-structural is magnetic micro-structure, and described medium substrate is dielectric material, and described micro-structural is electric conducting material.
5. wireless energy transfer system according to claim 4, it is characterized in that: described magnetic micro-structure is the derived structure of split ring resonator or split ring resonator.
6. wireless energy transfer system according to claim 4, it is characterized in that: described medium substrate is organic resin material or ceramic material.
7. according to the arbitrary described wireless energy transfer system of claim 1 to 6, it is characterized in that: described magnetic signal transmitter module comprises radiating circuit and transmitting antenna, described radiating circuit is magnetic field resonant excitation circuit, described magnetic field resonant excitation circuit produces the driving signal of particular job frequency, and described driving signal is launched by described transmitting antenna.
8. wireless energy transfer system according to claim 7, it is characterized in that: described transmitting antenna is the annular copper coil of single turn.
9. according to the arbitrary described wireless energy transfer system of claim 1 to 6, it is characterized in that: described energy receiver module comprises reception antenna and receiving circuit, described receiving circuit is rectification circuit, and the power conversion that described rectification circuit receives described reception antenna is electric energy output.
10. wireless energy transfer system according to claim 9, it is characterized in that: described reception antenna is the annular copper coil of single turn.
11. wireless energy transfer system according to claim 8 is characterized in that: the coil outer diameter of described transmitting antenna equals the external diameter of described plane conductive coil.
12. wireless energy transfer system according to claim 10 is characterized in that: the coil outer diameter of described reception antenna equals the external diameter of described plane conductive coil.
13. wireless energy transfer system according to claim 1 is characterized in that: two described plane conductive coils are wire coil, and two described planar metal coils are separately fixed on two non-magnetic substrates.
14. wireless energy transfer system according to claim 13 is characterized in that: described non-magnetic substrate is organic resin material.
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| CN2012100516904A CN103296776A (en) | 2012-03-01 | 2012-03-01 | Wireless energy transmission system |
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| CN2012100516904A CN103296776A (en) | 2012-03-01 | 2012-03-01 | Wireless energy transmission system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915907A (en) * | 2014-03-25 | 2014-07-09 | 复旦大学 | Primary-secondary self-coupling magnetic resonance wireless power transmission device and operation method thereof |
| CN104502870A (en) * | 2014-12-15 | 2015-04-08 | 安徽瑞迪太检测技术有限公司 | Planer weak coupling antenna applied to nuclear quadrupole resonance detection system |
| CN106160255A (en) * | 2016-07-04 | 2016-11-23 | 上海交通大学 | Wireless power transmission coil device based on Meta Materials |
| CN106532976A (en) * | 2016-11-16 | 2017-03-22 | 华中科技大学 | Wireless electric energy transmission device based on 13.56MHz metamaterial |
| CN106998103A (en) * | 2017-05-11 | 2017-08-01 | 深圳凌波近场科技有限公司 | Wide area free space optional position wireless energy transfer transmission antenna device and its energy transmission method |
| CN111643345A (en) * | 2020-05-18 | 2020-09-11 | 梁倩 | Anion health preserving urn for health care |
| CN114343839A (en) * | 2021-12-30 | 2022-04-15 | 德州环球之光医疗科技有限公司 | Treatment pattern conversion method based on adjustable spiral line type laser spots |
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| CN102082469A (en) * | 2009-11-30 | 2011-06-01 | Tdk株式会社 | Wireless power feeder, wireless power receiver, and wireless power transmission system |
| CN102122848A (en) * | 2010-01-08 | 2011-07-13 | 索尼公司 | Power feed device, power receiving device, and wireless power feed system |
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| US6791432B2 (en) * | 2000-03-17 | 2004-09-14 | The Regents Of The University Of California | Left handed composite media |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915907A (en) * | 2014-03-25 | 2014-07-09 | 复旦大学 | Primary-secondary self-coupling magnetic resonance wireless power transmission device and operation method thereof |
| CN104502870A (en) * | 2014-12-15 | 2015-04-08 | 安徽瑞迪太检测技术有限公司 | Planer weak coupling antenna applied to nuclear quadrupole resonance detection system |
| CN106160255A (en) * | 2016-07-04 | 2016-11-23 | 上海交通大学 | Wireless power transmission coil device based on Meta Materials |
| CN106160255B (en) * | 2016-07-04 | 2019-09-03 | 上海交通大学 | Wireless power transmission coil device based on Meta Materials |
| CN106532976A (en) * | 2016-11-16 | 2017-03-22 | 华中科技大学 | Wireless electric energy transmission device based on 13.56MHz metamaterial |
| CN106998103A (en) * | 2017-05-11 | 2017-08-01 | 深圳凌波近场科技有限公司 | Wide area free space optional position wireless energy transfer transmission antenna device and its energy transmission method |
| CN111643345A (en) * | 2020-05-18 | 2020-09-11 | 梁倩 | Anion health preserving urn for health care |
| CN114343839A (en) * | 2021-12-30 | 2022-04-15 | 德州环球之光医疗科技有限公司 | Treatment pattern conversion method based on adjustable spiral line type laser spots |
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