CN103296774A - Wireless energy transmission system - Google Patents
- ️Wed Sep 11 2013
CN103296774A - Wireless energy transmission system - Google Patents
Wireless energy transmission system Download PDFInfo
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- CN103296774A CN103296774A CN2012100510043A CN201210051004A CN103296774A CN 103296774 A CN103296774 A CN 103296774A CN 2012100510043 A CN2012100510043 A CN 2012100510043A CN 201210051004 A CN201210051004 A CN 201210051004A CN 103296774 A CN103296774 A CN 103296774A Authority
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- China Prior art keywords
- magnetic
- magnetic resonance
- wireless energy
- energy transfer
- square spiral Prior art date
- 2012-02-29 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention provides a wireless energy transmission system. By means of the fact that optimization design is conducted on a magnetic resonance receiving module, the magnetic resonance receiving module is composed of a substrate and a metal resonance coil fixed on the substrate, and a plurality of magnetic microstructures are further installed on the magnetic resonance receiving module. 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 magnetic resonance receiving module. Manufacturing of the magnetic resonance receiving module can be achieved through the existing PCB manufacturing process, and industrialized production is facilitated.
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, the magnetic resonance transmitter module, be arranged on magnetic resonance receiver module and reception antenna in the load equipment, described transmitting antenna connect described signal exciting circuit with the emission resonance signal to described magnetic resonance transmitter 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 signal receiving antenna is electrically connected described load equipment so that electric energy to be provided, described magnetic resonance receiver module is provided with a plurality of magnetic micro-structures, 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 fields.
Particularly, described magnetic resonance receiver module is made up of base material and the resonant wire circle that is fixed on the base material, and described a plurality of magnetic micro-structures are arranged on the central area of described resonant wire circle.
Particularly, 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, 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.
Preferably, described first square spiral and second square spiral are the axial symmetry setting with described connecting line.
Preferably, the magnetic permeability of described magnetic micro-structure is-1.
Particularly, described magnetic micro-structure is the derived structure of split ring resonator or split ring resonator.
Preferably, 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.
Particularly, the derived structure of described split ring resonator or split ring resonator is rectangle, circle or polygon.
Particularly, described base material is organic resin material or ceramic material.
The invention has the beneficial effects as follows:
1, by the magnetic resonance receiver module is optimized design, the magnetic resonance receiver module is made up of base material and the resonant wire circle that is fixed on the base material, also be provided with a plurality of magnetic micro-structures on the magnetic resonance receiver module, described magnetic micro-structure has negative magnetoconductivity, the frequency of described magnetic micro-structure with negative magnetoconductivity is identical with the resonance frequency of magnetic resonance receiver module, the manufacturing of above-mentioned magnetic resonance receiver module can realize by existing PCB manufacturing process, be conducive to industrialized production;
2, pass through the design of negative magnetoconductivity magnetic micro-structure, can strengthen the resonant fields between magnetic resonance transmitter module and the magnetic resonance receiver module, 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, improved the use degree of freedom of receiving terminal load equipment greatly, brought convenience to the user.
3, by the design to the negative magnetoconductivity 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 transmitter module.
Fig. 3, the structure chart of the second embodiment magnetic resonance transmitter 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
drawing1, comprise
power module1, signal
exciting circuit2, transmitting
antenna3, magnetic
resonance transmitter module4, magnetic
resonance receiver module5,
reception antenna6 and
load equipment7, magnetic
resonance receiver module5 and
reception antenna6 are arranged in the
load equipment7, the input of transmitting
antenna3 connects the signal output part of signal
exciting circuit2, and the pumping signal of magnetic resonance is emitted to magnetic
resonance transmitter module4, should be understood that, the frequency of pumping signal just equals the resonance frequency of the resonant fields between magnetic
resonance transmitter module4 and the magnetic
resonance receiver module5 at this moment, so that produce resonance between magnetic
resonance transmitter module4 and the magnetic
resonance receiver module5, carry out the energy transmission by suddenly the die coupling of line of resonant fields between magnetic
resonance transmitter module4 and the magnetic
resonance receiver module5,
reception antenna6 is electrically connected the power circuit of
load equipment7, in order to receive the electric energy that magnetic
resonance receiver module5 produces.
Among the present invention, magnetic
resonance receiver module5 is made up of base material and the metal wire structure that is fixed on the base material, accompanying
drawing2 is the structure chart of magnetic
resonance receiver module5, formed by
base material51 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 the
magnetic micro-structure53 of
resonant wire circle52 and a plurality of rectangular arrays, the spiral metal coil of
resonant wire circle52 sides of being annular, a plurality of magnetic micro-structures 53 are arranged on the spiral central area of
resonant wire circle52,
magnetic micro-structure53 has negative magnetoconductivity, and have negative magnetoconductivity
magnetic micro-structure53 frequency with
resonance wire coil52 resonance frequency identical.
Magnetic
resonance receiver module5 has identical resonance frequency with magnetic
resonance transmitter module4, makes between magnetic
resonance transmitter module4 and the magnetic
resonance receiver module5 by suddenly the die coupling of line of resonant fields to carry out the energy transmission.
In the present embodiment, the material that a plurality of
magnetic micro-structures53 and the
base material51 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 module5 just by arranging of a plurality of magnetic micro-structures 43, to improve energy transmission efficiency between magnetic
resonance transmitter module4 and the magnetic
resonance receiver module5.
As second embodiment, magnetic
resonance receiver module5 can also adopt following structure, referring to accompanying
drawing3, magnetic
resonance transmitter module5 is made up of
base material51 and the metal wire structure that is fixed on the base material, metal wire structure comprises resonant wire circle and a plurality of magnetic micro-structure 53, the resonant wire circle is by first square spiral 54, second square spiral 54 ', connecting line 55 and hollow closed line 56 are formed, first square spiral 54 and second square spiral 54 ' external end head be connected an end of connecting line 55 respectively, the other end connector font closed line 56 of connecting line 55, hollow closed line 56 encirclement first square spiral 54 and second square spiral 54 ', first square spiral 44 and second square spiral 54 ' with connecting line 55 are the axial symmetry setting, a plurality of
magnetic micro-structures53 be arranged on first square spiral 54 and second square spiral 54 ' the central area,
magnetic micro-structure53 has negative magnetoconductivity, and have negative magnetoconductivity magnetic micro-structure 53 frequency with resonance wire coil resonance frequency identical.
As embodiment, the concrete structure of
magnetic micro-structure53 is the circular or square spiral shell coiling with multiple coiling among the present invention, accompanying
drawing4 has provided a kind of structure chart of square spiral shell coiling,
magnetic micro-structure53 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
drawing5, 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 frequency magnetic micro-structure array identical with the resonance frequency of resonant fields in the wireless energy transfer system under the negative magnetoconductivity condition.
Energy transmission efficiency to the magnetic
resonance receiver module5 of above-mentioned second embodiment carries out emulation testing below, the resonance coil size dimension of magnetic
resonance receiver module5 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 transmitter module4 and the magnetic
resonance receiver module5, 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 magnetic
resonance transmitter module4 and the magnetic
resonance receiver module5 is air, for improving energy transmission efficiency, need to have good impedance matching between design magnetic micro-structure array 43 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 designs by the magnetic micro-structure to magnetic
resonance receiver module5, 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, the magnetic resonance transmitter module, be arranged on magnetic resonance receiver module and reception antenna in the load equipment, described transmitting antenna connect described signal exciting circuit with the emission resonance signal to described magnetic resonance transmitter 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 signal receiving antenna is electrically connected described load equipment so that electric energy to be provided, it is characterized in that: described magnetic resonance receiver module is provided with a plurality of magnetic micro-structures, 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 fields.
2. wireless energy transfer system according to claim 1 is characterized in that: described magnetic resonance receiver module is made up of base material and the resonant wire circle that is fixed on the base material, and described a plurality of magnetic micro-structures are arranged on the central area of described resonant wire circle.
3. wireless energy transfer system according to claim 2, it is characterized in that: described resonant wire circle is square spiral shell coiling.
4. according to claim 2 or 3 described wireless energy transfer systems, 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, 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.
5. wireless energy transfer system according to claim 4, it is characterized in that: described first square spiral and second square spiral are the axial symmetry setting with described connecting line.
6. wireless energy transfer system according to claim 1, it is characterized in that: the magnetic permeability of described magnetic micro-structure is-1.
7. 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.
8. wireless energy transfer system according to claim 1 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.
9. wireless energy transfer system according to claim 7, it is characterized in that: the derived structure of described split ring resonator or split ring resonator is rectangle, circle or polygon.
10. wireless energy transfer system according to claim 1, it is characterized in that: described base material is organic resin material or ceramic material.
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| WO2016206648A1 (en) * | 2015-06-26 | 2016-12-29 | 苏州宝时得电动工具有限公司 | Autonomous mobile device and wireless charging system thereof |
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| CN102201704A (en) * | 2010-03-25 | 2011-09-28 | 通用电气公司 | Contactless power transfer system and method |
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| US20110133568A1 (en) * | 2009-12-03 | 2011-06-09 | Bingnan Wang | Wireless Energy Transfer with Metamaterials |
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| US12233734B2 (en) | 2015-06-26 | 2025-02-25 | Positec Power Tools (Suzhou) Co., Ltd. | Autonomous mobile device and wireless charging system thereof |
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| 2015-02-04 | SE01 | Entry into force of request for substantive examination | |
| 2019-08-30 | RJ01 | Rejection of invention patent application after publication | |
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Application publication date: 20130911 |