KR101629811B1 - Wireless energy transmitting system - Google Patents

Abstract

The present invention relates to a wireless energy transmission device and a wireless energy transmission system. In particular, a wireless energy transmission system according to an embodiment of the present invention includes: a wireless energy transmission apparatus including a planar meta-material structure having a zero refraction index; And at least one wireless energy receiving device formed to correspond to the wireless energy transmitting device at a predetermined distance, and the wireless energy receiving device is made smaller than the wireless energy transmitting device.

Description

[0001] WIRELESS ENERGY TRANSMITTING SYSTEM [0002]

The present invention relates to a wireless energy transmission system.

Wireless power transmission technology can be divided into three broad categories according to the transmission method.

The long-distance wireless power transmission method has been studied for a long time by radiating and delivering a microwave of high output such as 5.8 GHz, but it has not been commercialized due to human influences.

In the case of a wireless power transmission system using electromagnetic induction coupling, a magnetic field induced by a current flowing in a coil of a transmitting terminal induces a current in a coil of the receiving terminal. Transportation cards (T-money, etc.), wireless shaver, electric toothbrush, etc., but the transmission distance is limited to a maximum of several centimeters.

The magnetic resonance type wireless power transmission system is based on the principle of resonance coupling in which electromagnetic waves travel through a near magnetic field between two media resonating at the same frequency, and has recently attracted attention. In the case of the magnetic resonance type method, the value of the Q factor at resonance must be very large. However, due to the change of the impedance depending on the load condition and the influence of the surrounding conductor, the queue factor value can not be kept high. It is a fact that I can not.

Specifically, in the magnetic resonance type wireless power transmission system, a magnetic field formed in a space between the wireless energy transmission apparatus and the wireless energy reception apparatus becomes a medium through which energy is transmitted. Here, the magnetic field formed in the space between the wireless energy transmission apparatus and the wireless energy reception apparatus is directly related to the energy transmission efficiency and transmission distance of the wireless energy transmission system.

In the case of a conventional wireless energy transmission system, when energy is transmitted from a wireless energy transmission apparatus to a wireless energy reception apparatus, a magnetic field as an energy transfer medium is radiated outside the space between the wireless energy transmission apparatus and the wireless energy reception apparatus, .

For example, there is a problem that a magnetic field, which is an energy transfer medium, is radiated to the rear side of the wireless energy transmission device or is radiated to an area that the wireless energy reception device can not receive.

Accordingly, there is a need for a method of preventing loss of a magnetic field formed in a space between a wireless energy transmission apparatus and a wireless energy reception apparatus, thereby improving energy transmission efficiency and transmission distance of the wireless energy transmission system.

In connection with the magnetic resonance type wireless power transmission system, Korean Unexamined Patent Publication No. 2002-0026789 (entitled: wireless power transmission device, wireless charging device and wireless charging system using the same) generates a magnetic field to resonate the transmission resonator And a sensing resonator for controlling resonance of the transmission resonator on the basis of the distance between the external charger and the wireless charger to be charged is disclosed to prevent unnecessary power consumption in the transmitter have.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a wireless energy transmission method and a wireless energy transmission method which can contribute to the realization of wireless energy transmission technology, And it is an object of the present invention to provide a wireless energy transmission device and a wireless energy transmission system capable of miniaturizing the size of the device.

It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a wireless energy transmission system including: a wireless energy transmission apparatus including a planar meta-material structure having a zero refraction index; And at least one wireless energy receiving device formed to correspond to the wireless energy transmitting device at a predetermined distance, and the wireless energy receiving device is made smaller than the wireless energy transmitting device.

Also, a wireless energy transmission apparatus according to an embodiment of the present invention includes: a coupling loop for generating a magnetic field; And a plate-like metamaterial structure spaced apart from the coupling loop and having a zero index of refraction, the generated magnetic field being transmitted to the wireless energy receiving device through the metamaterial structure.

The wireless energy transmission system, which is one of the tasks of the present invention, can reduce the size of the receiving apparatus by using a meta material structure having a zero refractive index, and can reduce the size of the receiving apparatus, for example, The energy transfer efficiency can be maintained at a certain level or more.

Further, the wireless energy transmission apparatus proposed by the present invention can be utilized for realizing a technique of wirelessly charging a plurality of smart mobile devices irrespective of the model simultaneously.

1 is a plan view and a perspective view illustrating a wireless energy transmission system according to an embodiment of the present invention.
2 is a view for explaining a meta-material structure of a wireless energy transmission apparatus according to an embodiment of the present invention.
FIG. 3 is a view for explaining a unit cell and a split ring resonator shown in FIG. 2. FIG.
4A is a view showing a front surface and a rear surface of the unit cell shown in FIG.
4B is a side view of the unit cell shown in FIG. 2. FIG.
5 is an example of a wireless energy transmission system according to an embodiment of the present invention.
6 is another example of implementing a wireless energy transmission system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

1 is a plan view and a perspective view illustrating a wireless energy transmission system according to an embodiment of the present invention.

The wireless energy transmission system according to an embodiment of the present invention includes a wireless energy transmission apparatus 100 and a wireless energy reception apparatus 200. [

The wireless energy transmission device 100 includes a flat metamaterial structure 110 having a zero index of refraction.

The meta-material structure 110 may include a plurality of unit cells arranged in an array, and each unit cell may include a split ring resonator (SRR). The unit cell may have a substantially zero effective permeability value through a split ring resonator formed on both surfaces 110a and 110b, respectively. A detailed description of the unit cell will be described later.

Generally, a meta-material means a material having a permittivity or permeability smaller than 1, including a negative number. When ENG (Epsilon NeGative) is used when the permittivity is negative, MNG (Mu NeGative) is used when the permeability is negative, DNG (Double Negative), NRI (Negative Refractive Index) and LHM (Left Handed Material).

The refractive index of the meta-material structure 110 can be expressed by the permittivity and the permeability, and is subject to the Snell's law of the law of refraction. By implementing the meta-material structure 110 of the present invention with a split ring resonator, the meta-material structure 110 can have an effective permeability (real part) approximated to zero and a zero refractive index. Even if an arbitrary signal is incident on the meta-material having zero refractive index at an arbitrary incident angle, the signal goes straight with a reflection angle of 0 due to the characteristic of the meta-material.

Referring again to FIG. 1, the wireless energy transmission apparatus 100 may further include a coupling loop 130 spaced apart from the metamaterial structure 110 to generate a magnetic field. At this time, the above-described meta-material structure 110 may be positioned between the coupling loop 130 and a wireless energy receiving apparatus 200 to be described later.

The wireless energy receiving apparatus 200 is formed to correspond to the wireless energy transmitting apparatus 100 at a predetermined distance. The wireless energy receiving apparatus 200 can receive the magnetic field generated in the coupling loop 130 through the meta-material structure 110 described above.

Particularly, the wireless energy receiving apparatus 200 is made smaller than the wireless energy transmitting apparatus 100. Accordingly, the wireless energy transmission system includes at least one wireless energy receiving apparatus 200 for one wireless energy transmitting apparatus 100. [

In more detail, the wireless energy receiving apparatus 200 may include a charging unit (not shown) connected to the battery of the mobile device, and a plurality of wireless energy receiving apparatuses 200 may transmit the flat surface of the meta- And may be formed at any position within the imaginary rectangular parallelepiped space.

For example, the size of the wireless energy receiving apparatus 200 may be less than 1/4 of the size of the wireless energy transmitting apparatus 100, and the wireless energy receiving apparatus 200 may be a wireless energy transmitting apparatus 100, May not include the same structure as the meta-material structure 110 of FIG. Here, the size of each device may indicate the area facing each other.

Hereinafter, the unit cell of the meta-material structure 110 will be described in detail with reference to FIGS. 2 to 4. FIG.

2 is a view for explaining a meta-material structure of a wireless energy transmission apparatus according to an embodiment of the present invention.

The planar meta-material structure 110 shown in FIG. 2 has twenty five unit cells having a zero refraction index and a 5 * 5 arrangement. It should be noted that FIG. 2 is merely an example of the number of unit cells and the arrangement of the unit cells, and it is not limited thereto.

FIG. 3 is a view for explaining a unit cell and a split ring resonator shown in FIG. 2. FIG.

FIG. 4A is a front view and a rear view of the unit cell shown in FIG. 2. FIG. 4B is a side view of the unit cell shown in FIG.

Each unit cell in the metamaterial structure 110 may include a substrate 111, a wire 113, a capacitor 114, and a via 115.

The substrate 111 may be in the form of a rectangular parallelepiped having a through hole 112 in the vicinity of the center, and the shape may be appropriately modified to form an array structure.

The first wire 113a may be formed on the upper surface of the substrate 111 and may be in a spiral form. The second wire 113b may be formed on the lower surface of the substrate 111 and may be formed in a spiral shape corresponding to the first wire 113a. That is, the first wire 113a and the second wire 113b may be substantially the same shape.

The capacitor 114 may be connected to a segmented portion which is a broken portion of the first wire 113a and the second wire 113b. That is, each of the first wire 113a and the second wire 113b has a broken portion, which is a partially broken portion, and the capacitor 114 can connect the broken portion.

4a, the split ring resonator can be implemented by a capacitor 114, which is a spiral shaped wire 113 and a lumped configuration, and is substantially identical to the front and back surfaces of the unit cell And can have corresponding connection relationships.

More specifically, the split ring resonator can resonate in the 6.78 MHz frequency band through a total of six capacitors, three at each side. That is, in the frequency band of 6.78 MHz, the real and imaginary values of the effective permeability are all 0, the zero value of the real number means the zero refraction index, and the zero value of the imaginary number means losslessness.

Referring to FIG. 4B, the connection unit 115 can connect the first wire 113a formed on the upper surface of the substrate 111 and the second wire 113b formed on the lower surface of the substrate 111 to each other.

As described above, the wireless energy transmission system proposed in the present invention can reduce the size of the receiving apparatus by using the meta material structure having the zero refraction index, compared with the existing system. For example, even when the distance is about 15 cm, The efficiency can be maintained above a certain level.

Meanwhile, FIG. 5 illustrates an example of a wireless energy transmission system according to an embodiment of the present invention.

The wireless energy transmission device 100 includes a coupling loop for generating a magnetic field, and a metamaterial structure of a flat plate shape spaced apart from the coupling loop and having a zero index of refraction. The magnetic field generated by the coupling loop in the wireless energy transmission apparatus 100 is transmitted to the wireless energy receiving apparatus 200 through the metamaterial structure having a plurality of unit cells.

Referring to FIG. 5, the wireless energy transmission device 100 is manufactured at a size of 140 mm × 210 mm, and the wireless energy receiving device 200 is manufactured at a size of 50 mm × 70 mm. The distance h between the wireless energy transmitting apparatus 100 including the coupling loop and the metamaterial structure spaced 3 mm from each other and the wireless energy receiving apparatus 200 can be variably controlled. The wireless energy receiving device 200 is similar to the battery size of a smart mobile device (e.g., any type of handheld based wireless communication device including smartphones and tablet PCs, smart glasses, smart watches, etc.) Or made identically.

Although the distance h between the wireless energy transmission apparatus 100 and the wireless energy reception apparatus 200 is adjusted from 10 cm to 15 cm in the above embodiment, it can be confirmed that wireless energy transmission is possible with a high efficiency of 50% or more. That is, even if the distance for transmitting energy is remote, the reduction in efficiency is negligible due to the characteristic of zero refractive index.

As described above, since the wireless energy receiving apparatus can be downsized and the wireless energy can be transmitted while maintaining high efficiency while being separated by a certain distance, the present invention can be utilized for realizing a technology for wirelessly charging a smart mobile device.

6 is another example of implementing a wireless energy transmission system according to an embodiment of the present invention.

The wireless energy transmission apparatus 100 includes a planar meta-material structure having a zero refraction index, and the plurality of wireless energy receiving apparatuses 200a, 200b, and 200c correspond to the wireless energy transmission apparatus 100 at a predetermined distance .

6, since the wireless energy receiving apparatuses 200a, 200b, and 200c are manufactured to be smaller than the wireless energy transmitting apparatus 100, the virtual energy transmitting apparatuses 200a, 200b, May be formed at various positions in a rectangular parallelepipedal space.

As described above, the present invention can be utilized for realizing a technique of wirelessly charging a plurality of smart mobile devices irrespective of the model.

In addition, the present invention is not limited to wireless charging for a smart mobile device as in the above embodiment, and can be utilized in various areas.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: wireless energy transmission device 110: meta-material structure
130: Coupling loop 200: Wireless energy receiver

Claims (12)

In a wireless energy transmission system,
A coupling loop for generating a magnetic field; And a radio energy transmission device comprising a metamaterial structure in a plate form spaced apart from the coupling loop and having a zero index of refraction; And
And at least one wireless energy receiving device formed to correspond to the wireless energy transmitting device at a predetermined distance,
The wireless energy receiving apparatus is made smaller than the wireless energy transmitting apparatus,
Wherein the meta-material structure includes a plurality of unit cells arranged in a row, the unit cell includes a split ring resonator,
The unit cell includes:
A substrate having a hole in the center;
A first wire in a spiral shape formed on an upper surface of the substrate;
A second wire formed on the bottom surface of the substrate so as to correspond to the first wire;
A capacitor connected to the segmented portion, which is a broken portion formed on each of the first wire and the second wire; And
And a connecting portion connecting the first wire and the second wire to each other,
The capacitors are formed in three on each of the upper and lower surfaces of the substrate to have a zero effective permeability value in a 6.78 MHz band,
Wherein the plurality of unit cells are arranged so that opposite ends of the wires face each other in the same direction, and both end regions of the wires of the unit cells are formed to be arranged in the same direction,
Wherein the coupling loop is formed with an area corresponding to the area of the meta-material structure.
delete delete delete delete delete The method according to claim 1,
Wherein the wireless energy receiving device includes a charger connected to a battery of the mobile device.
The method according to claim 1,
Wherein the wireless energy receiving apparatus is formed at an arbitrary position in a virtual rectangular parallelepiped having a flat plate having the meta-material structure as one face.
A wireless energy transmission apparatus comprising:
A coupling loop for generating a magnetic field; And
A metatubular structure spaced apart from the coupling loop and having a flat refractive index of zero,
Wherein the generated magnetic field is transmitted to the wireless energy receiving apparatus through the meta-material structure, the meta-material structure includes a plurality of unit cells arranged, and the unit cell includes a split ring resonator,
The unit cell includes:
A substrate having a hole in the center;
A first wire in a spiral shape formed on an upper surface of the substrate;
A second wire formed on the bottom surface of the substrate so as to correspond to the first wire;
A capacitor connected to the segmented portion, which is a broken portion formed on each of the first wire and the second wire; And
And a connecting portion connecting the first wire and the second wire to each other,
The capacitors are formed in three on each of the upper and lower surfaces of the substrate to have a zero effective permeability value in a 6.78 MHz band,
Wherein the plurality of unit cells are arranged so that one end of each of the wires faces in the same direction, and both end regions of the wires of each unit cell are formed to be arranged in the same direction,
Wherein the coupling loop is formed with an area corresponding to an area of the meta-material structure.
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