CN103296768A - Wireless energy transmitting system - Google Patents
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- CN103296768A CN103296768A CN2012100505948A CN201210050594A CN103296768A CN 103296768 A CN103296768 A CN 103296768A CN 2012100505948 A CN2012100505948 A CN 2012100505948A CN 201210050594 A CN201210050594 A CN 201210050594A CN 103296768 A CN103296768 A CN 103296768A
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Abstract
The invention provides a wireless energy transmitting system. A metamaterial is fixedly arranged at the front end of a magnetic resonance emitting module of the wireless energy transmitting system. As the metamaterial is arranged, the energy transmitting efficiency of the whole wireless energy transmitting system is improved. As far as the whole system is concerned, a transmitting distance of energy is long, a device at a receiving end does not need to be close to an emitting end to transmit energy, thus, a use freedom degree of the loading device at the receiving end is greatly improved and convenience is brought to users. By means of design of the metamaterial, a microstructure of the metamaterial is designed to be a multinest opened resonance ring or a derived structure of an opened resonance ring in a multiple winding mode. On one hand, the resonance frequency of the metamaterial is adjusted by means of the number of turns of a winding wire and on the other hand, the resonance frequency is greatly reduced, influences on environment by the wireless energy transmitting system are reduced and safety performance is improved.
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 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.Though the magnetic resonance formula can realize the energy transmission of longer distance, its 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.
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.
In the existing negative magnetoconductivity artificial material, single artificial micro-structural (being commonly referred to as cell) is the derived structure of single split ring structure or split ring, comprise square structure, circular configuration or polygonized structure, the size of its micro-structural is very big, particularly for the application of low-frequency band, the size of its micro-structural has reached decimeter grade, and this makes that the overall volume of super material is excessive, brings difficulty to application.
[summary of the invention]
Technical problem to be solved by this invention is: provide a kind of transmission range long based on super material technology, the wireless energy transfer system that efficiency of transmission is high.
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 resonance transmitting end device and be arranged on the interior magnetic resonance receiving end device of load equipment, described magnetic resonance transmitting end device comprises power module and magnetic resonance transmitter module, described magnetic resonance receiving end device comprises the magnetic resonance receiver module, described magnetic resonance receiver module is electrically connected described load equipment, 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 load equipment also comprises super material, described super material is fixedly installed on the front end of described magnetic resonance receiver module, described super material has negative magnetoconductivity, and the frequency of described super material with negative magnetoconductivity is identical with the resonance frequency of described magnetic resonance transmitter module and magnetic resonance receiver module.
Particularly, described super material is slab construction, and described super material and described magnetic resonance receiver module opposing parallel arrange.
Preferably, the magnetic permeability of described super material is-1.
During concrete enforcement, 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.
During concrete enforcement, described magnetic micro-structure is the derived structure of split ring resonator or split ring resonator.
During concrete enforcement, described magnetic resonance transmitter module comprises radiating circuit, transmitting antenna and magnetic resonance transmitting coil, described radiating circuit connects described power module, described magnetic resonance receiver module comprises magnetic resonance receive coil, reception antenna and receiving circuit, and described receiving circuit is electrically connected described load equipment.
During concrete enforcement, described radiating circuit is magnetic field resonant excitation circuit, and described magnetic field resonant excitation circuit produces the driving signal that frequency is identical with the resonance frequency of described magnetic resonance transmitting coil, and described driving signal is launched by described transmitting antenna.
During concrete enforcement, described receiving circuit is rectification circuit, and the power conversion that described rectification circuit receives described reception antenna is the required signal output of electric energy.
Better, single described magnetic micro-structure forms the split ring resonator of multinest or the derived structure of split ring resonator by the mode of a wires by multiple coiling.
Preferably, the derived structure of described split ring resonator or split ring resonator is rectangle, circle or polygon.
Preferably, described single magnetic micro-structure is the split ring resonator of 5-80 circle multinest 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, fixedly install super material by the front end at the magnetic resonance receiver module of wireless energy transfer system, setting by super material, 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.
By the design to super material, material microstructure be will surpass in the mode of multiple coiling and the split ring resonator of multinest or the derived structure of split ring resonator will be designed to, can regulate the resonance frequency of super material 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 structural representation of embodiment 1 wireless energy transfer system.
Fig. 2, the structural representation of embodiment 2 wireless energy transfer systems.
Fig. 3, the overall structure schematic diagram of super material.
Fig. 4, the enlarged drawing of metallic copper micro-structural.
Fig. 5, the characteristic curve diagram of super material resonances frequency.
Fig. 6 has the wireless energy transfer system magnetic field energy spirogram of super material.
Fig. 7, not the wireless energy transfer system magnetic field energy spirogram of super material.
Fig. 8, split ring derived structure figure.
Fig. 9, hexagonal apertures loops composition.
[embodiment]
The present invention is described in detail below in conjunction with drawings and Examples.
Embodiment 1
A kind of wireless energy transfer system, its system configuration schematic diagram is referring to accompanying drawing 1, comprise the magnetic resonance transmitting end device and be arranged on the interior magnetic resonance receiving end device of load equipment, the magnetic resonance transmitting end device comprises crust of the device 1, power module 2, magnetic resonance transmitter module 3, be provided with the magnetic resonance receiving end device in the load equipment 5, the magnetic resonance receiving end device comprises super material 4 and magnetic resonance receiver module 6, super material 4 is fixedly installed on the front end of magnetic resonance receiver module 6, carry out the energy transmission by suddenly the die coupling of line of resonant fields between magnetic resonance transmitter module 3 and the magnetic resonance receiver module 6, super material 4 has negative magnetoconductivity, and the frequency of super material 4 with negative magnetoconductivity is identical with the resonance frequency of magnetic resonance transmitter module 3 and magnetic resonance receiver module 6.
In the present embodiment, magnetic resonance transmitter module 3 and magnetic resonance receiver module 6 have identical resonance frequency and carry out the energy transmission by suddenly the die coupling of line of resonant fields, magnetic resonance receiver module 6 is electric current with the power conversion that receives, finally load equipment 5 is powered, be fixedly installed on the super material 4 of magnetic resonance receiver module 6 front ends owing to have negative magnetoconductivity, can play the magnetic field humidification, therefore can improve the energy transmission efficiency of system and increase transmission range.
The super material that has negative magnetoconductivity in the present embodiment, comprise medium substrate and the array a plurality of artificial micro-structural on medium substrate, artificial microstructure design is magnetic micro-structure, it is the derived structure that single artificial micro-structural (being commonly referred to as cell) is single split ring structure or split ring, medium substrate is dielectric material, micro-structural is electric conducting material, because this structure can equivalence be the LC resonant circuit, so can realize enhancing to magnetic field by the array of a plurality of magnetic micro-structures.
A kind of wireless energy transfer system, its system configuration schematic diagram is referring to accompanying drawing 2, comprise the magnetic resonance transmitting end device and be arranged on the interior magnetic resonance receiving end device of load equipment, the magnetic resonance transmitting end device comprises crust of the device 1, power module 2, magnetic field resonant excitation circuit 31, transmitting antenna 32 and magnetic resonance transmitting coil 33, be provided with the magnetic resonance receiving end device in the load equipment 5, the magnetic resonance receiving end device comprises super material 4, magnetic resonance receive coil 61, reception antenna 62 and receiving circuit 63, super material 4 is fixedly installed on the front end of magnetic resonance receive coil 61, carry out the energy transmission by suddenly the die coupling of line of resonant fields between magnetic resonance transmitting coil 33 and the magnetic resonance receive coil 61, super material 4 has negative magnetoconductivity, and the frequency of super material 4 with negative magnetoconductivity is identical with the resonance frequency of magnetic resonance transmitting coil 33 and magnetic resonance receive coil 61.
The operation principle of present embodiment is: power module 1 is converted to alternating current behind the direct current and provides DC power supply for magnetic field resonant excitation circuit 2, magnetic field resonant excitation circuit 2 produces the driving signal that frequency is identical with the resonance frequency of magnetic resonance transmitting coil 33, this driving signal is launched by transmitting antenna 3, resonance takes place and carries out the energy transmission by suddenly the die coupling of line of resonant fields in magnetic resonance transmitting coil 33 and magnetic resonance receive coil 61, because super material 4 has negative magnetoconductivity, can play the effect that magnetic field strengthens to the magnetic field between super material 4 and the magnetic resonance receive coil 61, and then improve energy transmission efficiency and the energization transmission range of system.Reception antenna 6 receives the magnetic field energy of magnetic resonance receive coil 61 and is converted to electric energy by receiving circuit 63, output to load equipment 5, receiving circuit 63 adopts rectification circuit, and the power conversion that rectification circuit receives reception antenna 63 is the required signal output of electric energy.
At first just how to obtain the super material of negative magnetoconductivity below, and how to make the frequency of the super material under the negative magnetoconductivity condition and identical being elaborated of resonance frequency of magnetic resonance transmitting coil and magnetic resonance receive coil.
Adopt the PCB manufacturing technology, cover copper at the epoxy resin fiberglass plate, prepare the metallic copper micro structure array by the method for printed circuit, obtain super material, the overall structure schematic diagram of super material is referring to accompanying drawing 3, the metallic copper micro-structural 102 that comprises epoxy resin fiberglass plate 101 and array, the enlarged drawing of metallic copper micro-structural 102 is referring to accompanying drawing 4, micro-structural 102 is formed by the multiple coiling of copper wire that head and the tail do not join, coiling is square on the whole, coiling is 37 circles, live width 0.1mm, and obtaining its resonance peak frequency by emulation testing is 32MHz.
For the 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, and has increased inductance L equivalently, thereby has reduced the resonance frequency of micro-structural, can regulate the resonance frequency of micro-structural by the number of turns of adjusting coiling, and then can regulate the resonance frequency of whole super material.There are specific relation in the magnetic permeability of super material and resonance frequency, namely super material the frequency range of negative magnetoconductivity occurs always near super material resonances frequency, characteristic curve diagram according to super material resonances frequency, referring to accompanying drawing 5, as can be seen, in a band frequency scope of resonance peak back, the magnetic permeability of super material is for negative.Because super material magnetic permeability is closely related for the resonance frequency of negative frequency band and super material, namely change along with the variation of super material resonances frequency, therefore by the adjusting to super material resonances frequency, can obtain magnetic resonance transmitting coil in negative magnetoconductivity condition lower frequency and wireless energy transfer system and the identical super material of resonance frequency of magnetic resonance receive coil.
Certainly, shape by changing micro-structural and select suitable methods such as medium substrate material, can regulate the resonance frequency of super material, thereby select to obtain the negative magnetoconductivity condition lower frequency super material identical with the resonance frequency of magnetic resonance transmitting coil and magnetic resonance receive coil.
With regard to the super material of negative magnetoconductivity the enhancing effect in magnetic field is tested below.
Wireless energy transfer system with above-described embodiment, the effect that in the Comsol of simulation software 3.5 its magnetic field is strengthened is carried out emulation testing, the magnetic field energy spirogram that obtains is referring to accompanying drawing 6, wireless energy transfer system at the magnetic field energy spirogram that does not add excess of imports material referring to accompanying drawing 7, comparison diagram 6 and Fig. 7 can clearly find out, after adding excess of imports material, magnetic field energy has increased about 3dB.
Because the adding by super material, can strengthen alternating magnetic field intensity between super material 4 and the magnetic resonance receive coil 61, 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, owing to be air between magnetic resonance transmitting coil 33, super material 4, magnetic resonance receive coil 61 threes, for improving energy transmission efficiency, has good impedance matching between the super material 4 that the needs design adds and the air, to reduce the reflection of energy, therefore, to select magnetic permeability be that-1 super material is as the magnetic field enhance device in the present invention.
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 is by the design to super material, to surpass material microstructure in the mode of multiple coiling and be designed to the split ring resonator of multinest or the derived structure of split ring resonator, and can regulate resonance frequency by the number of turns of coiling on the one hand, and can greatly reduce resonance frequency on the other hand, reduce wireless energy transfer system to the influence of environment, improve security performance.
In the above-described embodiments, 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 will surpass the structure that material microstructure is designed to multinest by the mode of multiple coiling, all can realize beneficial effect of the present invention.As embodiment, Fig. 8, Fig. 9 have provided the structure chart of other two kinds of super material microstructures respectively, and Fig. 8 is spill split ring structure chart, and Fig. 9 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 (12)
1. wireless energy transfer system, comprise the magnetic resonance transmitting end device and be arranged on the interior magnetic resonance receiving end device of load equipment, described magnetic resonance transmitting end device comprises power module and magnetic resonance transmitter module, described magnetic resonance receiving end device comprises the magnetic resonance receiver module, described magnetic resonance receiver module is electrically connected described load equipment, 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, it is characterized in that: described load equipment also comprises super material, described super material is fixedly installed on the front end of described magnetic resonance receiver module, described super material has negative magnetoconductivity, and the frequency of described super material with negative magnetoconductivity is identical with the resonance frequency of described magnetic resonance transmitter module and magnetic resonance receiver module.
2. wireless energy transfer system according to claim 1, it is characterized in that: described super material is slab construction, described super material and described magnetic resonance receiver module opposing parallel arrange.
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 1, it is characterized in that: described magnetic resonance transmitter module comprises radiating circuit, transmitting antenna and magnetic resonance transmitting coil, described radiating circuit connects described power module, described magnetic resonance receiver module comprises magnetic resonance receive coil, reception antenna and receiving circuit, and described receiving circuit is electrically connected described load equipment.
7. wireless energy transfer system according to claim 6, it is characterized in that: described radiating circuit is magnetic field resonant excitation circuit, described magnetic field resonant excitation circuit produces the driving signal that frequency is identical with the resonance frequency of described magnetic resonance transmitting coil, and described driving signal is launched by described transmitting antenna.
8. wireless energy transfer system according to claim 6, it is characterized in that: described receiving circuit is rectification circuit, the power conversion that described rectification circuit receives described reception antenna is the required signal output of electric energy.
9. wireless energy transfer system according to claim 4 is characterized in that: single described magnetic micro-structure forms the split ring resonator of multinest or the derived structure of split ring resonator by the mode of a wires by multiple coiling.
10. wireless energy transfer system according to claim 9, it is characterized in that: the derived structure of described split ring resonator or split ring resonator is rectangle, circle or polygon.
11. according to claim 9 or 10 described wireless energy transfer systems, it is characterized in that: described single magnetic micro-structure is the split ring resonator of 5-80 circle multinest or the derived structure of split ring resonator.
12. wireless energy transfer system according to claim 1 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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| CN2012100505948A CN103296768A (en) | 2012-02-29 | 2012-02-29 | Wireless energy transmitting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106688105A (en) * | 2014-06-20 | 2017-05-17 | 帕特里克·K·布拉迪 | System that converts electromagnetic radiation into electricity using metamaterials |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010038325A1 (en) * | 2000-03-17 | 2001-11-08 | The Regents Of The Uinversity Of California | Left handed composite media |
| CN101835653A (en) * | 2007-10-25 | 2010-09-15 | 丰田自动车株式会社 | Electric vehicles and power supply devices for vehicles |
| CN102170177A (en) * | 2011-04-27 | 2011-08-31 | 南京航空航天大学 | High-power wireless power transmission system |
| CN102201704A (en) * | 2010-03-25 | 2011-09-28 | 通用电气公司 | Contactless power transfer system and method |
| US20120038219A1 (en) * | 2010-03-25 | 2012-02-16 | Bingnan Wang | Wireless Energy Transfer with Anisotropic Metamaterials |
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2012
- 2012-02-29 CN CN2012100505948A patent/CN103296768A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010038325A1 (en) * | 2000-03-17 | 2001-11-08 | The Regents Of The Uinversity Of California | Left handed composite media |
| CN101835653A (en) * | 2007-10-25 | 2010-09-15 | 丰田自动车株式会社 | Electric vehicles and power supply devices for vehicles |
| CN102201704A (en) * | 2010-03-25 | 2011-09-28 | 通用电气公司 | Contactless power transfer system and method |
| US20120038219A1 (en) * | 2010-03-25 | 2012-02-16 | Bingnan Wang | Wireless Energy Transfer with Anisotropic Metamaterials |
| CN102170177A (en) * | 2011-04-27 | 2011-08-31 | 南京航空航天大学 | High-power wireless power transmission system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106688105A (en) * | 2014-06-20 | 2017-05-17 | 帕特里克·K·布拉迪 | System that converts electromagnetic radiation into electricity using metamaterials |
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Application publication date: 20130911 |