CN103296772A - Wireless energy transmission system - Google Patents
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- CN103296772A CN103296772A CN2012100509883A CN201210050988A CN103296772A CN 103296772 A CN103296772 A CN 103296772A CN 2012100509883 A CN2012100509883 A CN 2012100509883A CN 201210050988 A CN201210050988 A CN 201210050988A CN 103296772 A CN103296772 A CN 103296772A
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Abstract
The invention provides a wireless energy transmission system. By means of simplification design on a magnetic resonance receiving module, functions of the whole magnetic resonance receiving module are achieved through a substrate and a metal wire structure fixed on the substrate. The metal wire structure comprises a feeder line, a metal resonance coil and a plurality of magnetic microstructures, wherein the feeder line surrounds the metal resonance coil, the magnetic microstructures are installed at the center of the metal resonance coil, the magnetic microstructures have negative magnetic conductivity, and the frequency of the magnetic microstructures having the negative magnetic conductivity is the same as the resonant frequency of the wireless energy transmission system. By means of optimization design of the metal wire structure, the defect of structural complexity caused by independent installation of existing resonance receiving coils and existing receiving resonances is overcome.
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 (Institutefor Soldier Nanotechnologies) proposition.System adopts the resonance object of two same frequencys 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 power module, the signal exciting circuit, magnetic resonance transmitter module and the magnetic resonance receiver module that is arranged in the load equipment, the magnetic resonance transmitter module generally includes transmitting antenna and magnetic resonance transmitting coil, the magnetic resonance receiver module equally also comprises magnetic resonance receive coil and reception antenna, magnetic resonance transmitting coil and magnetic resonance receive coil are generally the copper coil of coiling, the structure more complicated of whole system, bring great difficulty for the predetermined system works frequency of design, so this technology only rests on the technical solution stage at present, also there is not ripe product.
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.
Super material refers to artificial composite structure or the composite material that some have the not available extraordinary physical property of natural material.Structurally ordered design by on the key physical yardstick of material can break through the restriction of some apparent natural law, thereby obtains to exceed the meta-materials function of the intrinsic common character of nature.The character of super material and function mainly come from its inner structure but not constitute their material, therefore, are design and synthetic super material, and people have carried out a lot of research work.2000, people such as the Smith of University of California pointed out that the composite construction of the metal wire of periodic arrangement and open loop resonator (SRR) can realize that DIELECTRIC CONSTANT and magnetic permeability μ simultaneously for negative two negative material, also claim left-handed materials.They are again by making the two negative material that metal wire and SRR composite construction have been realized two dimension at printed circuit board (PCB) (PCB) afterwards.Have metal wire and the open loop resonator structure of response for magnetic field, be referred to as magnetic micro-structure usually.
[summary of the invention]
Technical problem to be solved by this invention is: provide a kind of system configuration simple based on super material technology, be easy to the wireless energy transfer system that industrialization is made.
The present invention realizes that the technical scheme that goal of the invention adopts is, a kind of wireless energy transfer system, comprise power module, the signal exciting circuit, transmitting antenna, resonance coil and the magnetic resonance receiver module that is arranged in the load equipment, described transmitting antenna connects described signal exciting circuit makes described resonance coil produce resonance so that pumping signal to be provided, described magnetic resonance receiver module is electrically connected described load equipment so that electric energy to be provided, carry out the energy transmission by suddenly the die coupling of line of resonant fields between described magnetic resonance transmitter module and the described resonance coil, it is characterized in that: described magnetic resonance receiver module is made up of base material and the metal wire structure that is fixed on the base material, described metal wire structure comprises feeder line, resonant wire circle and a plurality of magnetic micro-structure, described feeder line is electrically connected with the power circuit of described load, described feeder line surrounds described resonant wire circle, described a plurality of magnetic micro-structure is arranged on the central area of described resonant wire circle, described magnetic micro-structure has negative magnetoconductivity, and the frequency of described magnetic metal micro-structural with negative magnetoconductivity is identical with the resonance frequency of described resonant wire circle.
Preferably, described resonant wire circle is square spiral shell coiling.
Preferably, described resonant wire circle comprises first square spiral, second square spiral, connecting line and hollow closed line, the external end head of described first square spiral and second square spiral is connected an end of described connecting line respectively, the other end of described connecting line connects described hollow closed line, described hollow closed line is surrounded described first square spiral and second square spiral, described feeder line surrounds described hollow closed line, be provided with the magnetic micro-structure of a plurality of arrays in the spiral central area of described first square spiral and second square spiral, described magnetic micro-structure has negative magnetoconductivity, and the frequency of described magnetic micro-structure with negative magnetoconductivity is identical with the resonance frequency of described resonant wire circle.
Better, described first square spiral and second square spiral are the axial symmetry setting with described connecting line.
Better, the magnetic permeability of described magnetic micro-structure is-1.
During concrete enforcement, described magnetic micro-structure is the derived structure of split ring resonator or split ring resonator.
Better, single described magnetic micro-structure by the mode of a wires by multiple coiling form multiple spiral shell around split ring resonator or the derived structure of split ring resonator.
During concrete enforcement, the derived structure of described split ring resonator or split ring resonator is rectangle, circle or polygon.
During concrete enforcement, single described magnetic micro-structure be 2-40 circle spiral shell around split ring resonator or the derived structure of split ring resonator.
During concrete enforcement, described power module is power-switching circuit, and described power-switching circuit is converted to direct current with alternating current.
The invention has the beneficial effects as follows:
1, by the magnetic resonance receiver module is carried out simplified design, by a base material be fixed on the function that metal wire structure on the base material realizes whole magnetic resonance receiver module, described metal wire structure comprises feeder line, resonant wire circle and a plurality of magnetic micro-structure, described feeder line surrounds described resonant wire circle, described a plurality of magnetic micro-structure is arranged on the central area of described resonant wire circle, described magnetic micro-structure has negative magnetoconductivity, and the frequency of described magnetic micro-structure with negative magnetoconductivity is identical with the resonance frequency of system.By the optimal design to above-mentioned metal wire structure, overcome existing resonance receiving coil and reception antenna the structural complexity that brings independently has been set respectively.
2, the setting by magnetic micro-structure, the energy transmission efficiency of whole wireless energy transfer system is improved, for whole system, energy long transmission distance not only, the equipment of receiving terminal does not need to be close to transmitting terminal, just can realize the energy transmission, improve the use degree of freedom of receiving terminal load equipment greatly, bring convenience to the user.
3, by the design to magnetic micro-structure, with the mode of multiple coiling with magnetic micro-structure be designed to multiple spiral shell around split ring resonator or the derived structure of split ring resonator, can regulate the resonance frequency of magnetic micro-structure by the number of turns of coiling on the one hand, can greatly reduce resonance frequency on the other hand, reduce wireless energy transfer system to the influence of environment, improve security performance.
[description of drawings]
Fig. 1, the overall structure schematic diagram of wireless energy transfer system of the present invention.
Fig. 2, the structure chart of magnetic resonance receiver module.
Fig. 3, the structure chart of the second embodiment magnetic resonance receiver module.
Fig. 4, the structure chart of square spiral shell coiling.
Fig. 5, the characteristic curve diagram of super material resonances frequency.
Fig. 6, the S11 of emulation testing and the curve chart of S21.
Fig. 7, split ring derived structure figure.
Fig. 8, hexagonal apertures loops composition.
[embodiment]
The present invention is described in detail below in conjunction with drawings and Examples.
At first introduce the overall structure of wireless energy transfer system of the present invention, its overall structure schematic diagram is referring to accompanying drawing 1, comprise power module 1, signal exciting circuit 2, transmitting antenna 3, resonance coil 4, magnetic resonance receiver module 5 and load equipment 6, magnetic resonance receiver module 5 is arranged in the load equipment 6, carries out the energy transmission by suddenly the die coupling of line of resonant fields between resonance coil 4 and the magnetic resonance receiver module 5.
Among the present invention, the structure chart of magnetic resonance receiver module 5 is referring to accompanying drawing 2, formed by base material 51 and the metal wire structure that is fixed on the base material, its basic structure is similar to the PCB antenna, base material can be the epoxy resin substrate on selecting for use, can also adopt the ceramic-like substrate according to application demand, with PCB antenna difference be, metal wire structure comprises feeder line 52, resonant wire circle 53 and a plurality of magnetic micro-structure 54, the resonance frequency of resonant wire circle 53 equals the resonance frequency of resonance coil 4, in order to produce resonance with resonance coil 4, the output of feeder line 52 is electrically connected the power circuit of load equipment 6 and thinks that load equipment 6 provides electric energy, feeder line 52 surrounds resonant wire circle 53 in order to receive resonant wire circle 53 resonance signals, a plurality of magnetic micro-structures 54 are arranged on the central area of resonant wire circle 53, magnetic micro-structure 54 has negative magnetoconductivity, and have negative magnetoconductivity magnetic micro-structure 54 frequency with resonance wire coil 53 resonance frequency identical.
Herein, the material that a plurality of magnetic micro-structures 54 and the base material 51 that adheres to thereof constitute is equivalent to a kind of super material, 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.The present invention strengthens the resonant field of magnetic resonance receiver module 5 just by arranging of a plurality of magnetic micro-structures 54, to improve energy transmission efficiency between resonance coil 4 and the magnetic resonance receiver module 5.
As second embodiment, magnetic resonance receiver module 5 can also adopt following structure, referring to accompanying drawing 3, magnetic resonance receiver module 5 is made up of base material 51 and the metal wire structure that is fixed on the base material, metal wire structure comprises feeder line 52, resonant wire circle and a plurality of magnetic micro-structure 54, the resonant wire circle is by first square spiral 55, second square spiral 55 ', connecting line 56 and hollow closed line 57 are formed, first square spiral 55 and second square spiral 55 ' external end head be connected an end of connecting line 56 respectively, the other end connector font closed line 57 of connecting line 56, hollow closed line 57 encirclement first square spiral 55 and second square spiral 55 ', feeder line 52 surrounds hollow closed line 57, the output of feeder line 52 connects the power circuit of load equipment 6, feeder line 52 surrounds the resonant wire circle in order to receive the resonance signal of resonant wire circle, first square spiral 55 and second square spiral 55 ' with connecting line 36 are the axial symmetry setting, a plurality of magnetic micro-structures 54 be arranged on first square spiral 55 and second square spiral 55 ' the central area, magnetic micro-structure 54 has negative magnetoconductivity, and have negative magnetoconductivity magnetic micro-structure 54 frequency with resonance wire coil resonance frequency identical.
As embodiment, the concrete structure of magnetic micro-structure 54 is the circular or square spiral shell coiling with multiple coiling among the present invention, accompanying drawing 4 has provided a kind of structure chart of square spiral shell coiling, magnetic micro-structure 54 is formed by the multiple coiling of metal copper wire that head and the tail do not join, coiling is square on the whole, coiling is 37 circles, live width 0.1mm.Its preparation can be adopted the PCB manufacturing technology, prepares the metallic copper micro structure array by the method for printed circuit.
For above-mentioned split ring resonator micro-structural, on circuit, can equivalence be lc circuit, annular metal cord equivalent inductance L, line capacitance equivalent capacity C, therefore, according to the formula of resonance frequency
After micro-structural carried out multiple coiling, the length of coil increases, increased inductance L equivalently, thereby reduced the resonance frequency of micro-structural, can regulate the resonance frequency of micro-structural by the number of turns and the coil diameter of adjusting coiling, and then can regulate the resonance frequency of whole magnetic micro-structure array.Because there are specific relation in the negative magnetoconductivity of magnetic micro-structure array and its resonance frequency, the frequency range of negative magnetoconductivity namely appears always near super material resonances frequency, characteristic curve diagram according to super material resonances frequency, referring to accompanying drawing 5, among the figure, abscissa is frequency, ordinate is magnetic permeability, negative magnetoconductivity is always in a band frequency scope of resonance peak back as seen from the figure, and 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, can be met the identical magnetic micro-structure array of resonance frequency of the magnetic resonance receiver module in frequency and the wireless energy transfer system under the negative magnetoconductivity condition.
Energy transmission efficiency to the magnetic resonance receiver module 5 of above-mentioned second embodiment carries out emulation testing below, the resonance coil size dimension of magnetic resonance receiver module 5 is 125mm*125mm, in the software of Comsol 3.5, carry out emulation testing, obtain the curve chart of its S11 and S21, referring to Fig. 6, as can be seen from Figure, has the highest energy transmission efficiency at system resonance frequency 633MHz place.
Because the setting by the magnetic micro-structure array, can strengthen alternating magnetic field intensity between magnetic resonance receiver module 5 and the resonance coil 4, so the energy transmission efficiency of whole wireless energy transfer system is improved, for whole system, the energy long transmission distance, the equipment of receiving terminal does not need to be close to transmitting terminal, just can realize the energy transmission, and can be applied on the bigger power consumption equipment of power consumption.
For wireless energy transfer, because the energy transmission medium between resonance coil 4 and the magnetic resonance receiver module 5 is air, for improving energy transmission efficiency, need to have good impedance matching between design magnetic micro-structure array 54 and the air, to reduce the reflection of energy, therefore, the present invention optimize magnetic permeability for-1 magnetic micro-structure array as the magnetic field enhance device.
For in the wireless charging application process to the environmentAL safety requirement, the frequency of wireless charging needs to reduce as much as possible, thereby reduces the electromagnetic effect to environment, particularly to the electromagnetic effect of human body.Therefore, for wireless energy transfer system, need reduce its resonance frequency as much as possible, the present invention will be by designing the magnetic micro-structure in the magnetic resonance receiver module 5, mode with multiple coiling is designed to the split ring resonator of multinest or the derived structure of split ring resonator with magnetic micro-structure, can regulate resonance frequency by the number of turns of coiling on the one hand, can greatly reduce resonance frequency on the other hand, reduce wireless energy transfer system to the influence of environment, improve security performance.
In the embodiment of above-mentioned magnetic micro-structure, only provided a kind of foursquare split ring structure, should be understood that, split ring is designed to arbitrary polygon, circle or other derived structures, and be designed to the structure of multiple coiling by the mode of multiple coiling, all can realize beneficial effect of the present invention.As embodiment, Fig. 7, Fig. 8 have provided the structure chart of other two kinds of magnetic micro-structures respectively, and Fig. 7 is spill split ring structure chart, and Fig. 8 is hexagonal apertures ring derived structure figure.
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 (10)
1. wireless energy transfer system, comprise power module, the signal exciting circuit, transmitting antenna, resonance coil and the magnetic resonance receiver module that is arranged in the load equipment, described transmitting antenna connects described signal exciting circuit makes described resonance coil produce resonance so that pumping signal to be provided, described magnetic resonance receiver module is electrically connected described load equipment so that electric energy to be provided, carry out the energy transmission by suddenly the die coupling of line of resonant fields between described magnetic resonance transmitter module and the described resonance coil, it is characterized in that: described magnetic resonance receiver module is made up of base material and the metal wire structure that is fixed on the base material, described metal wire structure comprises feeder line, resonant wire circle and a plurality of magnetic micro-structure, described feeder line is electrically connected with the power circuit of described load, described feeder line surrounds described resonant wire circle, described a plurality of magnetic micro-structure is arranged on the central area of described resonant wire circle, described magnetic micro-structure has negative magnetoconductivity, and the frequency of described magnetic metal micro-structural with negative magnetoconductivity is identical with the resonance frequency of described resonant wire circle.
2. wireless energy transfer system according to claim 1, it is characterized in that: described resonant wire circle is square spiral shell coiling.
3. wireless energy transfer system according to claim 2, it is characterized in that: described resonant wire circle comprises first square spiral, second square spiral, connecting line and hollow closed line, the external end head of described first square spiral and second square spiral is connected an end of described connecting line respectively, the other end of described connecting line connects described hollow closed line, described hollow closed line is surrounded described first square spiral and second square spiral, described feeder line surrounds described hollow closed line, be provided with the magnetic micro-structure of a plurality of arrays in the spiral central area of described first square spiral and second square spiral, described magnetic micro-structure has negative magnetoconductivity, and the frequency of described magnetic micro-structure with negative magnetoconductivity is identical with the resonance frequency of described resonant wire circle.
4. wireless energy transfer system according to claim 3, it is characterized in that: described first square spiral and second square spiral are the axial symmetry setting with described connecting line.
5. wireless energy transfer system according to claim 1, it is characterized in that: the magnetic permeability of described magnetic micro-structure is-1.
6. wireless energy transfer system according to claim 1, it is characterized in that: described magnetic micro-structure is the derived structure of split ring resonator or split ring resonator.
7. wireless energy transfer system according to claim 4 is characterized in that: single described magnetic micro-structure by the mode of a wires by multiple coiling form multiple spiral shell around split ring resonator or the derived structure of split ring resonator.
8. wireless energy transfer system according to claim 6, it is characterized in that: the derived structure of described split ring resonator or split ring resonator is rectangle, circle or polygon.
9. according to claim 7 or 8 described wireless energy transfer systems, it is characterized in that: single described magnetic micro-structure be 2-40 circle spiral shell around split ring resonator or the derived structure of split ring resonator.
10. wireless energy transfer system according to claim 1, it is characterized in that: described power module is power-switching circuit, and described power-switching circuit is converted to direct current with alternating current.
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| CN104578440A (en) * | 2013-10-25 | 2015-04-29 | 惠州市华阳多媒体电子有限公司 | Portable wireless charging receiver |
| CN107768840A (en) * | 2017-09-29 | 2018-03-06 | 五邑大学 | Application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power |
| CN110635578A (en) * | 2019-09-25 | 2019-12-31 | 福州大学 | Double-frequency negative permeability metamaterial plate applied to wireless power transmission |
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Application publication date: 20130911 |