CN103296775A - Wireless energy transmission system - Google Patents

The invention provides a wireless energy transmission system. By means of the fact that simplification design is conducted on a magnetic resonance transmitting module and a magnetic resonance receiving module, the signal transmitting or receiving function and the magnetic resonance function are simultaneously achieved through one antenna structure, and efficient and long-distance energy transmission is achieved by means of optimization design on a metal wire structure of the antenna structure. A first metamaterial is fixedly installed at the rear end of the magnetic resonance transmitting module, a second metamaterial is installed at the front end of the magnetic resonance receiving module, and efficiency of energy transmission of the whole wireless energy transmission system is improved. As for the whole wireless energy transmission system, the distance of energy transmission is long, equipment at the receiving end does not need to be attached to the transmitting end, energy transmission can be achieved, the degree of using freedom of the loading equipment at the receiving end is improved greatly, and convenience is brought to users.

[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.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.

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 system configuration simple based on super material technology, transmission range is long, 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 power module, the signal exciting circuit, magnetic resonance transmitter module and the magnetic resonance receiver module that is arranged in the load equipment, described signal exciting circuit connects described magnetic resonance transmitter module and pumping signal is provided, 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 magnetic resonance transmitter module is identical with magnetic resonance receiver module structure and all for by base material be fixed on the antenna structure that the metal wire structure on the base material is formed, described metal wire structure comprises feeder line, 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, the rear end of described magnetic resonance transmitter module also is set with and the first surpasses material, the front end of described magnetic resonance receiver module is provided with and the second surpasses material, described the first surpass material and the second surpass material all have negative magnetoconductivity, described have negative magnetoconductivity the first to surpass material identical with the resonance frequency of described magnetic resonance transmitter module and magnetic resonance receiver module with the frequency that the second surpasses material.

As embodiment, the inner termination place of described first square spiral and second square spiral is extended with a square metal sheet.

Preferably, described first square spiral and second square spiral are the axial symmetry setting with described connecting line.

During concrete enforcement, described the first surpass material and the second surpass material be slab construction, describedly the first surpass material and the setting of described magnetic resonance transmitter module opposing parallel, describedly the second surpass material and the setting of described magnetic resonance receiver module opposing parallel.。

Preferably, the described magnetic permeability that the first surpasses material and the second surpass material is-1.

Particularly, described the first surpass material and the second surpass material include medium substrate and a plurality of micro-structurals of array on medium substrate, described micro-structural is magnetic micro-structure, described medium substrate is dielectric material, described micro-structural is electric conducting material.

Particularly, described magnetic micro-structure is the derived structure of split ring resonator or split ring resonator.

Preferably, 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.

Particularly, the derived structure of described split ring resonator or split ring resonator is rectangle, circle or polygon.

Preferably, single described magnetic micro-structure is the split ring resonator of 5-80 circle multinest or the derived structure of split ring resonator.

Particularly, 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 magnetic resonance transmitter module and magnetic resonance receiver module are carried out simplified design, realized the function of signal emission or receiving function and magnetic resonance simultaneously with an antenna structure, be optimized design by the metal wire structure to antenna structure, realized efficient, energy transmission at a distance.

2, fixedly install by the rear end at the magnetic resonance transmitter module of wireless energy transfer system and the first surpass material, arrange at the front end of magnetic resonance receiver module and the second to surpass 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, improved the use degree of freedom of receiving terminal load equipment greatly, brought convenience to the user.

3, 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 wireless energy transfer system of the present invention.

Fig. 2, the metal wire structure figure of magnetic resonance transmitter module.

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.

Figure 10, the metal wire structure figure of another embodiment.

[embodiment]

The present invention is described in detail below in conjunction with drawings and Examples.

Various piece to wireless energy transfer system is elaborated below.

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.

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.

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.

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 embodiment of above-mentioned super material, 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.