KR20160007702A - Wireless power transport system using magnetic resonance beam steering resonators - Google Patents

Abstract

The present invention relates to a wireless power transmission system using a magnetic resonance beam steering resonator. The wireless power transmission system according to the present invention comprises: a source resonator for wirelessly transmitting power according to a designed frequency; one or more relay resonators for receiving and relaying power through the source resonator and magnetic coupling; a receiving resonator for receiving power through magnetic coupling from the relay resonator, and supplying the same to a load; and a beam steering controller for controlling a capacitor value included in one or more resonators of the source resonator, the relay resonator, and the receiving resonator such that the source resonator or the relay resonator steers magnetic beams to the receiving resonator in accordance with the magnetic coupling in a maximum efficiency condition according to the design frequency. The source resonator and the relay resonator are linearly arranged or arranged in a plane shape. According to the present invention, a receiver may be variously disposed by using beam steering. Moreover, multiple receiving resonators are prepared, so selective and focusing power transmission is possible.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission system using a magnetic resonance beam steering resonator,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission system, and more particularly, to a wireless power transmission system including a resonator capable of steering a beam of a magnetic resonance system.

Recently, there has been an increasing interest in the technology of transmitting power wirelessly.

In particular, a solid state charging cradle capable of wirelessly charging various types of mobile devices such as smart phones, tablet PCs, and MP3 players is one of the practical applications of the latest wireless power transmission technology. One of these recent wireless power transmission technologies is to take advantage of the resonance characteristics of RF components.

A wireless power transmission system using resonance characteristics includes a transmitting unit for supplying electric power and a receiving unit for receiving electric power. In the conventional technique, only two resonators for the transmitter and the receiver have been used. In this case, the distance and the position for the power transmission are limited. Therefore, various methods for increasing the distance and the degree of freedom of position have been searched, and a system using a plurality of resonators has been proposed. Such a system includes one or more relay resonators for connecting between a transmitter and a receiver, or designing the entire system including a plurality of receivers as a single power transmission system. In this system, as compared with a system including only two existing resonators at the same distance High transmission efficiency or transmission to multiple receivers is possible.

The technology that is the background of the present invention is described in Korean Patent Laid-Open Publication No. 2011-0004321 (published on Jan. 13, 2011).

A problem to be solved by the present invention is to provide a wireless power transmission system including a resonator capable of steering a beam of a magnetic resonance system.

According to an aspect of the present invention, there is provided a wireless power transmission system using a MRI beam steering resonator, including: at least one source resonator for wirelessly transmitting power according to a design frequency; One or more relay resonators for receiving and relaying power by the source resonator and magnetic coupling; At least one receiving resonator for receiving power from the source resonator and the relay resonator by magnetic coupling and supplying the received power to a load; And wherein the source resonator or the relay resonator is included in at least one resonator among the source resonator, the relay resonator and the receive resonator so as to steer the magnetic beam to the receive resonator in accordance with the magnetic coupling at the maximum efficiency condition according to the design frequency Wherein the source resonator and the relay resonator are arranged in a line or in a planar form.

Further, the beam steering controller can calculate the magnitude of the current flowing in the source resonator, the relay resonator, and the reception resonator through the following equation:

Here, Vs is the source voltage of the transmission resonator, R ₁ is the equivalent resistance, R ₂ to R _{n -1} is the equivalent resistance, R _n is the receiving circuit resonators included in the relay resonator circuit contained in the source resonator circuit Where Mmn is the mutual inductance between the mth resonator and the nth resonator, ω is the design frequency, R _L is the load contained in the receive resonator circuit, and C ₁ through C _n are the n resonators L ₁ to L _n denote inductor values respectively included in n resonators, and I ₁ to I _n denote current values flowing in n resonators, respectively.

Also, the beam steering controller may calculate the following maximum efficiency value using the above equation and control the capacitor value using a genetic algorithm so that the efficiency becomes the calculated maximum efficiency.

Also, the beam steering controller may control the capacitor value included in the relay resonator to one capacitor value using the following equation or a genetic algorithm.

Here, C _R is a capacitor value of the relay resonator.

Also, the beam steering controller may control the capacitor C ₁ of the source resonator so that the imaginary part of the input impedance Z _in becomes 0 according to the following equation.

Also, the beam steering controller may store the capacitor value of the resonators according to the beam steering mode and transmit the position information of the reception resonator, thereby controlling the capacitor value of the resonator.

In addition, each of the source resonator, the relay resonator, and the reception resonator may correspond to a closed loop shape of a polygonal or circular shape.

Also, the closed loop may correspond to at least one of a single loop, a multi-loop, a spiral structure, and a helix structure.

In addition, the beam steering controller may control the capacitor value so that the receiving resonator selects one resonator that is beam-steered to receive power in the source resonator or the relay resonator.

Also, the beam steering controller may control the value of the capacitor for beam steering by using information about the position of the receiving resonator.

In addition, the reception resonator may receive a plurality of reception notices, and the plurality of reception resonators may receive and transmit the entire power directly received from the relay resonator or the source resonator according to the steering of the magnetic beam.

Also, the reception resonator may have a capacitor value having a resonance frequency.

According to the wireless power transmission system using the magnetic resonance beam steering resonator of the present invention, various arrangements of the receiver are possible by using the beam steering. In addition, a plurality of receiving resonators are provided to enable selective and intensive power transmission.

1 is a circuit diagram illustrating a wireless power transmission system according to one embodiment of the present invention.
2A and 2B are schematic circuit diagrams according to the first embodiment of the present invention.
3 is a simulation distribution diagram of a magnetic beam according to the circuit diagram of FIG. 2B.
4 is a schematic circuit diagram according to a second embodiment of the present invention.
5 is a simulation distribution diagram of a magnetic beam according to the circuit diagram of FIG.
6 is a schematic circuit diagram showing a planar arrangement of a resonator according to a third embodiment of the present invention.
7 is a schematic circuit diagram showing a three-dimensional arrangement of a source resonator and at least one relay resonator according to a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. 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 "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

A wireless power transmission system according to the present invention includes one source resonator, one or more relay resonators, and one or more reception resonators. In addition, it is possible to include only the source resonator and one or more reception resonators without passing through the relay resonator.

Each of the source resonator, the relay resonator and the reception resonator constitutes a closed loop. Here, the closed loop may be in a circular or polygonal form. Further, the closed loop may correspond to at least one structure of a single loop structure, a multiple loop structure, a spiral structure, and a helix structure. Further, each resonator commonly includes an inductance component and a capacitor component, and the capacitor elements representing the capacitor component may be connected in parallel or in series to the circuit.

Each resonator has a resonance characteristic represented by the following equation (1).

Where f is the resonance frequency of the resonator, L is the inductance of the resonator, and C is the capacitance connected to the resonator.

1 is a circuit diagram illustrating a wireless power transmission system according to one embodiment of the present invention.

1, a wireless power transmission system according to an embodiment of the present invention includes one source resonator, one or more relay resonators, a reception resonator, and a resonant controller (not shown). Here, one or more reception resonators may be provided.

First, the source resonator transmits power wirelessly according to the design frequency, and the source power (V _s ), the capacitor (C ₁ ). The resistor R ₁ and the inductor L ₁ are directly connected to each other.

The plurality of relay resonators serve to transmit the power received from the source resonator to a reception resonator provided at the subsequent stage by magnetic coupling. The inductor L ₂ , ..., L _{n -1} , the resistors R ₂ , ..., R _{n -1} ) and capacitors (C ₂ , ..., C _{n -1} ) connected in series.

Next, the receiving resonator receives a power from the relay resonator to supply power to the load, and has a closed circuit form in which an inductor L _n , a capacitor C _n , a resistor R _n , and a load R _L are connected in series . It is preferable that the number of the reception resonators is one, but in case of distributing the power and supplying the power to the load, one or more reception resonators may be provided.

The source resonator, the at least one relay resonator, and the reception resonator form mutual magnet coupling, and transmit / receive power through the magnetic coupling.

Although not shown in FIG. 1, the beam steering controller may include a source resonator to provide maximum power transfer efficiency at the design frequency, and a source resonator to enable various beam steering from the relay resonator to the receive resonator. (C ₁ , C ₂ , ..., C _{n -1} , C _n ) included in the relay resonator and the reception resonator.

Here, the capacitors C ₁ , C ₂ , ..., C _{n -1} , C _n are implemented as variable capacitors, and the beam steering controller (not shown) is connected to the source resonator, the at least one relay resonator, (C ₁ , C ₂ , ..., C _{n -1} , C _n ).

However, the reception resonator may be fixed to the capacitor value C _n having the resonance frequency.

Here, R ₁ , R ₂ , and R _n are resistance components that the source resonator, the at least one relay resonator, and the reception resonator have in themselves, and L1, L2, ..., , Ln is the inductance component of the inductor, and C1, C2, ... , And Cn is the capacitance component of the capacitor connected to the resonator. And M ₁₂ , M ₂₃ , ... , M _{n -1, n} represent mutual inductance components between the resonator and the resonator, I ₁ , I ₂ , ... , I _N sequentially represent currents flowing in the source resonator, the at least one relay resonator, and the reception resonator. That is, when the total number N of resonators is 5, 1 denotes a source resonator, 2, 3 and 4 denote subscripts of a relay resonator, and 5 denotes subscripts of a receive resonator.

The process of calculating the current and efficiency to be distributed in the power transmission process according to the capacitance control by the beam steering controller can be expressed as follows.

The equation calculated by applying the Kirchhoff? Voltage Law (KVL) to the circuit diagram of Fig.

If here, one is the source cavity, Vs is transmitted voltage, R ₁ is an equivalent resistance that is included in the source resonator circuit, R ₂ to R _{n -1} is the equivalent resistance includes the relay resonator circuit in the source cavity, R _n indicates an equivalent resistance that is included in the reception resonator circuit, Mmn is the m-th resonator and n mutual inductance between the second cavity, ω is the design frequency, R _L denotes a load included in the received resonator circuit, C ₁ to C _n is a capacitor value included in n resonators, L ₁ to L _n are inductor values included in n resonators, and I ₁ to I _n are amounts of current flowing through n resonators, respectively.

All have a set value except for the adjustable capacitor values C ₁ to Cn in Equation (2).

Next, the efficiency to be transmitted from the source resonator to the reception resonator can be obtained using Equation (3).

Here, R ₁ to R _n are predetermined fixed values, and I ₁ to I _n can be expressed by the circuit elements constituting the circuit through the above-mentioned equation (2). Since only R _L is a variable in Equation (3), the optimal load R _Lmax that maximizes the efficiency can be obtained by differentiating Equation (3) from R _L and setting its derivative to 0 and calculating R _L have.

In order to calculate the efficiency in the efficiency equation of Equation (3), Equation (2) can be modified as shown in Equation (4) and Equation (3) can be modified as Equation (4)

Is possible, each of the equivalent resistors (R ₁ to R _n) value is measured in the circuit of Figure 1 value in the equation 5, R _L value is the optimum load values that have already been calculated using Equation (3), the current (I ₁ to I _n ) is a value represented by the capacitor value (C ₂ to C _n ) which is a variable element according to the result of Equation (4). The measured values of the equivalent resistors R ₁ to R _n , the calculated currents I ₁ to I _n , and the calculated optimum load R _L are substituted into the measured values of the capacitors C ₂ to C _n ) as a variable is calculated.

In Equation (6), Z _in represents the input impedance of the circuit of Fig. In Equation (7), the capacitor value (C ₁ ) of the source resonator is determined so that the imaginary part of the input impedance becomes zero.

In an embodiment according to the present invention, the beam steering controller may control the values of the current values I ₁ through I _{N - 1} by controlling the values of the capacitances (C ₁ through C _{n -1} ) of the source resonator and the at least one relay resonator. That is, adjusting the current means adjusting the magnetic field in the individual resonator, thereby enabling beam steering. In addition, the beam steering controller can adjust the current value to maximize the efficiency of power transmission from the receiver to the transmitter.

In a power transmission system according to an embodiment of the present invention that includes one source resonator, one or more relay resonators, and a receive resonator, a beam steering controller uses the Genetic Algorithm to optimize the capacitance for beam steering Can be found.

Genetic algorithms are probabilistic algorithms that help to optimize the system by finding genetically superior parameters. The genetic algorithm can be used to derive the value of the optimized capacitance to adjust the currents of the individual resonators and to maximize the power transfer from the receiver to the transmitter. At this time, the source resonator and the at least one relay resonator have individual capacitance values for the resonators optimized for the beam steering and maximum efficiency, not the capacitance values that make the resonance characteristics of the respective resonators, and have the maximum power transmission efficiency at this time. In addition, the capacitance value of a plurality of relay resonators can be maintained at a high power transmission efficiency even if they are collectively grouped into one value. The capacitance value at this time can be derived by using a genetic algorithm, It is possible. At this time, the equation is expressed by the following equation (6).

In this case, C _R is the capacitance of the relay resonator, and the efficiency equation is differentiated to C _R , so that the efficiency becomes zero.

Various embodiments of a wireless power transmission system according to the present invention will now be described.

2A and 2B are schematic circuit diagrams according to the first embodiment of the present invention.

In the following schematic circuit diagram, a source resonator including a power source, a receiving resonator including a resistor corresponding to a load, and a relay resonator including a capacitor are shown.

2A and 2B, a wireless power transmission system according to an embodiment of the present invention includes one source resonator and one or more relay resonators. As shown in FIG. 2A, the number of the reception resonators may be one, or may be plural, as shown in FIG. 2B.

In particular, as shown in FIG. 2B, it is possible to steer the beam toward the desired reception resonator by controlling the capacitor value of the relay resonator to adjust the density of the magnetic field formed around the plurality of reception resonators in the relay resonator.

That is, the beam steering controller stores the capacitor value of the resonators according to the beam steering mode, and can transmit the position information of the reception resonator, thereby controlling the capacitor value of the resonator.

In FIG. 2B, the capacitor value is controlled so that the magnetic field is concentrated on the reception resonator on the left side of the right side.

3 is a simulation distribution diagram of a magnetic beam according to the circuit diagram of FIG. 2B. 3, it can be seen that the magnetic field is concentrated on the left reception resonator according to the steering of the magnetic beam.

4 is a schematic circuit diagram according to a second embodiment of the present invention.

In FIG. 4, a wireless power transmission system according to one embodiment of the present invention is shown to include one source resonator and two receive resonators. In FIG. 4, it can be seen that the power transmitted from the source resonator is directly transmitted to the reception resonator without passing through the relay resonator. In this case, each of the two reception resonators can be transmitted by dividing the transmitted power according to the magnetic beam steering. That is, the power is distributed at 5: 5 to each of the two receivers. In addition, embodiments may be configured such that two receivers receive power through the relay resonator.

5 is a simulation distribution diagram of a magnetic beam according to the circuit diagram of FIG.

It can be seen that the magnetic fields of the same distribution are formed on the left and right sides in the distribution diagram of FIG.

6 is a schematic circuit diagram showing a planar arrangement of a resonator according to a third embodiment of the present invention.

In Fig. 6, an arrangement of a source resonator and a relay resonator arranged in one plane in a matrix form is shown. In this case, a distribution map of a complex magnetic beam can be formed as compared with a resonator arranged in a line.

7 is a configuration diagram showing a three-dimensional arrangement of a source resonator and at least one relay resonator according to a fourth embodiment of the present invention.

In FIG. 7, a plurality of sets of reception resonators and relay resonators arranged in a plane may be provided and arranged three-dimensionally. Here, the reception resonator receives and supplies power to a load such as a computer, a portable telephone, and an air conditioner.

As described above, according to the wireless power transmission system using the beam steering resonator according to the embodiment of the present invention, it is possible to arrange various types of receivers using beam steering. In addition, a plurality of receiving resonators are provided to enable selective and intensive power transmission.

The present invention has been described above with reference to the embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. Therefore, the scope of the present invention is not limited to the above-described embodiments, but should be construed to include various embodiments within the scope of the claims and equivalents thereof.

Claims (12)

One or more source resonators for wirelessly transmitting power according to a design frequency;
One or more relay resonators for receiving and relaying power by the source resonator and magnetic coupling;
At least one receiving resonator for receiving power from the source resonator and the relay resonator by magnetic coupling and supplying the received power to a load; And
The relay resonator and the reception resonator are arranged such that the source resonator or the relay resonator guides the magnetic beam to the reception resonator in accordance with the magnetic coupling under the maximum efficiency condition according to the design frequency. And a beam steering controller for controlling a capacitor value,
Wherein the source resonator and the relay resonator are arranged in a line or arranged in a plane. The method according to claim 1,
Wherein the beam steering controller comprises:
A wireless power transmission system using a magnetic resonance beam steering resonator that calculates the magnitude of a current flowing in the source resonator, the relay resonator, and the reception resonator through the following equation:

Here, Vs is the source voltage of the transmission resonator, R ₁ is the equivalent resistance, R ₂ to R _{n -1} is the equivalent resistance, R _n is the receiving circuit resonators included in the relay resonator circuit contained in the source resonator circuit Where Mmn is the mutual inductance between the mth resonator and the nth resonator, ω is the design frequency, R _L is the load contained in the receive resonator circuit, and C ₁ through C _n are the n resonators L ₁ to L _n denote inductances respectively included in n resonators, and I ₁ to I _n denote current values flowing through n resonators, respectively. 3. The method of claim 2,
Wherein the beam steering controller comprises:
A wireless power transmission system using a magnetic resonance beam steering resonator that calculates the following maximum efficiency value using the above equation and controls the capacitor value using a genetic algorithm so that the efficiency becomes the calculated maximum efficiency .

The method of claim 3,
Wherein the beam steering controller comprises:
Wherein the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency of the resonance frequency-

Here, C _R is a capacitor value of the relay resonator. 3. The method of claim 2,
Wherein the beam steering controller comprises:
Wherein a value of a capacitor (C ₁ ) of the source resonator is controlled so that an imaginary part of an input impedance (Z _in ) becomes 0 according to the following equation.

The method according to claim 1,
Wherein the beam steering controller comprises:
Wherein the capacitor value of the resonators according to the beam steering mode is stored and the position information of the reception resonator is transmitted to thereby control the capacitor value of the resonator. The method according to claim 1,
Wherein each of the source resonator, the relay resonator,
A wireless power transmission system using a magnetic resonance beam steering resonator corresponding to a polygonal or circular closed loop shape. 8. The method of claim 7,
The closed-
A wireless power transmission system using a magnetic resonance beam steering resonator corresponding to at least one structure of a single loop, a multiple loop, a spiral structure, and a helix structure. The method according to claim 1,
Wherein the beam steering controller comprises:
Wherein the resonant frequency of the capacitor is controlled so that the receiving resonator selects one resonator that is beam-steered to receive power finally from the source resonator or the relay resonator. 10. The method of claim 9,
Wherein the beam steering controller comprises:
And controlling the capacitor value for the beam steering by using information about the position of the receiving resonator. The method of claim 1,
The reception resonator includes:
Wherein the plurality of receiving resonators divide the total power received directly from the relay resonator or the source resonator into a plurality of receiving resonators according to the steering of the magnetic beam. The method of claim 1,
The reception resonator includes:
A wireless power transmission system having a capacitor value with a resonant frequency.

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