KR20130082119A - Self-resonant apparatus for wireless power transmission system - Google Patents

Abstract

PURPOSE: A self-resonant apparatus for a wireless power transmission system is provided to assure small size and high quality factor. CONSTITUTION: A source (110) includes a variable switching power supply (111), a power amplifier (112), a matching network (113), a control part (114) and a communication part (115). The variable switching mode power supply generates a DC voltage by switching an AC voltage of several Hz bandwidth outputted from a power supply unit. The control part detects mismatching between a target resonator (131) and a source resonator (133) on the basis of the detected reflected wave. The source resonator delivers electromagnetic energy (130) to the target resonator. A target (200) includes a matching network (121), a rectification part (122), a DC/DC converter (123), a communication part (124) and a control part (125).

Description

Self-resonant device for wireless power transmission system {SELF-RESONANT APPARATUS FOR WIRELESS POWER TRANSMISSION SYSTEM}

The following embodiments relate to electrical and wireless technologies, and more particularly to a wireless power transfer system.

Many solutions have been proposed in the field of power transmission using radio waves, and basic ideas have been devised by Nikola Tesla.

A device known as a "rectenna" has been used for wireless energy transmission. Rectifiers have been used to convert microwave energy directly into direct current power. Other types of antennas may be used to receive the RF signal.

Most wireless power transmissions operate in the GHz frequency range. One of the disadvantages of this method is that the corresponding frequency range is harmful to the human body.

In one aspect, a self-resonant device for a wireless power transfer system includes ring resonators, wherein the ring resonators are represented by a combination having metamaterial characteristics, the combination being a split-ring connected in parallel with capacitors. ) Resonators, wherein the split ring resonators are each twisted and connected alternately in front and rear, and each split ring resonator acts as a metal strip mounted on a dielectric layer and is adjacent to the split by a series capacitor. It can be connected to the ring resonator.

The split-ring resonators rotate, and the angle of rotation can be selected such that a surface-mounted capacitor in series has an optimal space for the mount.

The split-ring resonators may be circular or polygonal.

The thickness of the dielectric layer may have a value in the range of 50 μm to 1500 μm.

The dielectric constant of the dielectric layer may have a value in the range of 2 to 20.

The number of split ring resonators may be at least two.

The operating frequency band of the split ring resonators may be from 1 MHz to 100 MHz.

Split-ring resonators coupled in parallel with the capacitors may be manufactured by low temperature co-fired ceramic technology or printed circuit board technology.

Each of the split-ring resonators connected in parallel with the capacitor may include an equivalent circuit composed of a parallel resonant LC circuit and a series capacitor.

The parallel resonant LC circuit includes an inductive element and a capacitive element, and may be connected in series with an active reactance.

The combination may be represented by an equivalent circuit comprising a plurality of cells, each cell comprising a parallel resonant circuit formed by a split-ring resonator and a capacitor connected in parallel, wherein the cells are connected to the series capacitor. Can be connected in series.

The combination of the parallel resonant circuit and the series capacitor can exhibit two resonant responses of typical impedance for metamaterials.

The Q factor of the combination may have a value in the range of 100 to 200.

It may further include a magnetic rod along the axis of the split ring resonator.

The magnetic rod may be made of ferrite.

The capacitors may be embedded within the dielectric layer having a high dielectric constant.

1 illustrates a wireless power transfer system according to an embodiment.
FIG. 2 illustrates a flat petal resonant structure including eight petals of a self-resonant device for a wireless power transmission system according to an embodiment.
3 illustrates a structure of a single split ring resonator of a self resonator for a wireless power transmission system according to an exemplary embodiment.
4 illustrates an equivalent circuit of a single split ring resonator including a series capacitor and a parallel capacitor in a self resonator for a wireless power transmission system according to an embodiment.
5 is a graph showing the relationship between the magnitude and frequency of the input impedance in the resonant cell according to an embodiment.
6 illustrates a metamaterial resonance structure according to an embodiment.
7 illustrates an equivalent circuit of a self-resonant device for a wireless power transmission system having a multi-layer resonant structure according to an embodiment.
FIG. 8 illustrates a layer-by-layer design of a self-resonant device for a wireless power transmission system having a multi-layer resonant structure according to another embodiment.
9 illustrates a multilayer self resonant structure including coupling capacitors of a self resonator device for a wireless power transfer system according to another embodiment.
10 illustrates a cross-sectional view of a multilayer self resonant structure including coupling capacitors according to one embodiment.
11 illustrates a metamaterial resonant structure including a magnetic rod according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a wireless power transfer system according to an embodiment.

Referring to FIG. 1, a wireless power transmission system according to an embodiment includes a source 110 and a target 120. The source 110 refers to a device for supplying wireless power, and the device may include all electronic devices capable of supplying power such as a pad, a terminal, and a TV. The target 120 refers to a device that receives wireless power, and the device may include all electronic devices that require power such as a terminal, a TV, a car, a washing machine, a radio, a lamp, and the like.

The source 110 may include a variable switching mode power supply (SMPS) 111, a power amplifier 112, a matching network 113, a controller 114, and a communicator 115. Include.

A variable switching mode power supply (SMPS) 111 generates a DC voltage by switching an AC voltage of several tens of Hz bands output from a power supply. The variable switching mode power supply (SMPS) 111 may output a DC voltage of a constant level or adjust the output level of the DC voltage according to the control of the Tx Control Logic 114.

The power detector 116 detects an output current and a voltage of a variable switching mode power supply (SMPS) 111 and controls the information about the detected current and voltage. To pass. The power detector 116 may also detect the input current and voltage of the power amplifier 112.

The power amplifier 112 may generate power by converting a DC voltage of a constant level into an AC voltage by a switching pulse signal of several MHz to several tens of MHz bands. That is, the power amplifier 112 converts the DC voltage supplied to the power amplifier 112 into an AC voltage by using the reference resonance frequency FRef, thereby communicating power used in the plurality of target devices. Alternatively, charging power may be generated.

Here, the communication power means a small power of 0.1 to 1 mWatt, and the charging power means a large power of 1 mWatt to 200 Watt consumed in the device load of the target device. As used herein, the term "charging" may be used to mean powering a unit or element charging power. The term "charging" may also be used to mean powering a unit or element that consumes power. Here, the unit or element includes, for example, a battery, a display, a voice output circuit, a main processor, and various sensors.

In the present specification, the "reference resonance frequency" is used as the meaning of the resonance frequency that the source 110 basically uses. In addition, "tracking frequency" is used to mean a resonant frequency adjusted according to a preset scheme.

The control unit 114 detects a reflected wave for “communication power” or “charge power” and detects mismatching between the target resonator 133 and the source resonator 131 based on the detected reflected wave. The control unit 114 can detect the mismatching by detecting the envelope of the reflected wave and detecting the mismatching or detecting the amount of power of the reflected wave.

The matching network 113 may compensate the impedance mismatching between the source resonator 131 and the target resonator 133 with an optimal matching under the control of the controller 114. The matching network 113 may be connected via a switch under the control of the controller 114 to a combination of capacitors or inductors.

The controller 114 calculates a voltage standing wave ratio (VSWR) based on the level of the output voltage of the source resonator 131 or the power amplifier 112 and the voltage level of the reflected wave. When the voltage standing wave ratio is larger than a predetermined value, it may be determined that the mismatch is detected.

In addition, when the voltage standing wave ratio is greater than a predetermined value, the controller 114 calculates a power transmission efficiency for each of the N tracking frequencies, and determines a tracking frequency FBest having the best power transmission efficiency among the N tracking frequencies. The FRef can be adjusted to the FBest.

Also, the control unit 114 can adjust the frequency of the switching pulse signal. The frequency of the switching pulse signal can be determined by the control of the controller 114. [ The controller 114 may generate a modulated signal for transmission to the target 120 by controlling the power amplifier 112. That is, the communication unit 115 may transmit various data 140 with the target 120 through in-band communication. In addition, the controller 114 may detect the reflected wave and demodulate a signal received from the target 120 through the envelope of the reflected wave.

The control unit 114 may generate a modulated signal for performing in-band communication through various methods. The control unit 114 can generate a modulation signal by turning on / off the switching pulse signal. In addition, the control unit 114 may perform delta-sigma modulation to generate a modulated signal. The controller 114 may generate a pulse width modulated signal having a constant envelope.

Meanwhile, the communication unit 115 may perform out-band communication using a communication channel. The communication unit 115 may include a communication module such as Zigbee or Bluetooth. The communicator 115 may transmit the target 120 and the data 140 through out-band communication.

The source resonator 131 transfers electromagnetic energy 130 to the target resonator 133. That is, the source resonator 131 transfers "communication power" or "charge power" to the target 120 through the magnetic coupling with the target resonator 133.

The target 120 includes a matching network 121, a rectifying section 122, a DC / DC converter 123, a communication section 124 and a control section 125.

The target resonator 133 receives electromagnetic energy from the source resonator 131. That is, the target resonator 133 receives "communication power" or "charging power" from the source 110 through magnetic coupling with the source resonator 131. In addition, the target resonator 133 may receive various data 140 from the source 110 through in-band communication.

The matching network 121 may match the input impedance shown to the source 110 and the output impedance shown to the load. The matching network 121 may be composed of a combination of a capacitor and an inductor.

The rectifying unit 122 rectifies the AC voltage to generate a DC voltage. That is, the rectifying section 122 rectifies the received AC voltage to the target resonator 133.

The DC / DC converter 123 adjusts the level of the DC voltage output from the rectifier 122 according to the capacity required by the load. For example, the DC / DC converter 123 can adjust the level of the DC voltage output from the rectifying unit 122 to 3 to 10 Volts.

The power detector 127 can detect the voltage of the input terminal 126 of the DC / DC converter 123 and the current and voltage of the output terminal. The detected voltage at the input 126 can be used to calculate the transmission efficiency of the power delivered from the source. The detected output current and voltage may be used by the control unit 125 to calculate the power delivered to the load. The controller 114 of the source 110 may determine the power to be transmitted from the source 110 in consideration of the power required for the load and the power transmitted to the load.

When the power of the output terminal calculated by the communication unit 124 is transferred to the source 110, the power to be transmitted to the source 110 may be calculated.

The communication unit 124 may perform in-band communication for transmitting and receiving data using the resonance frequency. The control unit 125 may detect a signal between the target resonator 133 and the rectifying unit 122 to demodulate the received signal or detect the output signal of the rectifying unit 122 to demodulate the received signal. That is, the controller 125 may demodulate a message received through in-band communication. The control unit 125 can modulate the signal to be transmitted to the source 110 by adjusting the impedance of the target resonator 133 through the matching network 121. [ As a simple example, the control unit 125 may increase the impedance of the target resonator 133 so that the reflected wave is detected at the control unit 114 of the source 110. [ Depending on whether the reflected wave is generated, the controller 114 of the source 110 may detect a binary "0" or "1".

The communication unit 124 is "type of the product of the target", "manufacturer information of the target", "model name of the target", "battery type of the target", "charging method of the target", "load of the target Impedance value "," information on the target resonator's characteristic of the target "," information on the frequency band used by the target "," power consumption of the target "," unique identifier of the target "and" The response message including the "version or specification information of the product of the target" may be transmitted to the communication unit 115 of the source 110.

Meanwhile, the communication unit 124 may perform out-band communication using a communication channel. The communication unit 124 may include a communication module such as Zigbee or Bluetooth. The communication unit 124 may transmit and receive the source 110 and the data 140 through out-band communication.

The communicator 124 receives the wake-up request message from the source 110, the power detector 127 detects the amount of power received by the target resonator 133, and the communicator 124 transmits the target resonator 133. Information about the amount of power received at may be transmitted to the source 110. At this time, the information on the amount of power received by the target resonator 133, "input voltage value and current value of the rectifier 122", "output voltage value and current value of the rectifier 122" or "DC / DC Output voltage value and current value of converter 123 ".

In FIG. 1, the controller 114 may set a resonance bandwidth of the source resonator 131. According to the setting of the resonance bandwidth of the source resonator 131, the quality-factor QS of the source resonator 131 may be determined.

In addition, the controller 125 may set a resonance bandwidth of the target resonator 133. According to the setting of the resonance bandwidth of the target resonator 133, a quality-factor (Q-factor) of the target resonator 133 may be determined. At this time, the resonant bandwidth of the source resonator 131 can be set to be wider or narrower than the resonant bandwidth of the target resonator 133.

Through communication, the source 110 and the target 120 can share information about the resonant bandwidth of the source resonator 131 and the target resonator 133, respectively. When a higher power than the reference value is required from the target 120, the quality-factor QS of the source resonator 131 may be set to a value greater than 100. In addition, when a lower power than the reference value is required from the target 120, the quality-factor QS of the source resonator 131 may be set to a value smaller than 100.

In resonant wireless power transmission, the resonance bandwidth is an important factor. When Qt is a quality-factor (Q-factor) that takes into account the change in distance between the source resonator 131 and the target resonator 133, the change in the resonance impedance, the impedance mismatch, the reflected signal, and the like, Qt is expressed by Equation 1 As shown in FIG.

[Equation 1]

는 대역폭,

는 공진기 사이의 반사 손실, BW_S는 소스 공진기(131)의 공진 대역폭, BW_D는 타겟 공진기(133)의 공진 대역폭을 나타낸다. In Equation 1, f ₀ is the center frequency,

Bandwidth,

Is a reflection loss between the resonators, BW _S is the resonance bandwidth of the source resonator 131, BW _D is the resonance bandwidth of the target resonator 133.

Meanwhile, in the wireless power transmission, the efficiency U of the wireless power transmission may be defined as in Equation 2.

&Quot; (2) "

는 소스 공진기(131)에서의 반사계수,

는 타겟 공진기(133)에서의 반사계수,

는 공진 주파수, M은 소스 공진기(131)와 타겟 공진기(133) 사이의 상호 인덕턴스, R_S는 소스 공진기(131)의 임피던스, R_D는 타겟 공진기(133)의 임피던스, Q_S는 소스 공진기(131)의 퀄리티-팩터(Q-factor), Q_D는 타겟 공진기(133)의 퀄리티-팩터(Q-factor), QK는 소스 공진기(131)와 타겟 공진기(133) 사이의 에너지 커플링에 대한 퀄리티-팩터(Q-factor)이다. Where K is the coupling coefficient for the energy coupling between the source resonator 131 and the target resonator 133,

Is the reflection coefficient in the source resonator 131,

Is the reflection coefficient at the target resonator 133,

Is the resonant frequency, M is the mutual inductance between the source resonator 131 and the target resonator 133, R _S is the impedance of the source resonator 131, R _D is the impedance of the target resonator 133, Q _S is the source resonator ( Q-factor of Q 131, Q _D is Q-factor of target resonator 133, QK is the energy coupling between source resonator 131 and target resonator 133. It's a quality factor.

Referring to Equation 2, the Q-factor is highly related to the efficiency of wireless power transmission.

Therefore, in order to increase the efficiency of wireless power transmission, the quality factor (Q-factor) is set to a high value. In this case, when Q _S and Q _D are each set to an excessively high value, a change in coupling coefficient K for energy coupling, a change in distance between the source resonator 131 and the target resonator 133, a change in resonance impedance, and an impedance miss A phenomenon in which the efficiency of the wireless power transmission may decrease due to matching or the like may occur.

In addition, if the resonance bandwidth of each of the source resonator 131 and the target resonator 133 is set too narrow in order to increase the efficiency of wireless power transmission, impedance mismatching or the like may easily occur even with a small external influence. Considering the impedance mismatch, Equation 1 may be expressed as Equation 3.

&Quot; (3) "

In FIG. 1, source 110 wirelessly transmits wake-up power for wake-up of target 120, broadcasts a configuration signal for configuring a wireless power transfer network, and configures the configuration signal. an identifier for receiving from the target 120 a search frame including a reception sensitivity value of a configuration signal, allowing joining of the target 120, and identifying the target 120 in a wireless power transmission network. The charging power may be transmitted to the target 120, the charging power may be generated through power control, and the charging power may be wirelessly transmitted to the target 120.

In addition, the target 120 may receive wakeup power from at least one of the plurality of source devices, activate the communication function using the wake-up power, and transmit the wireless power transmission network of each of the plurality of source devices Select a source 110 based on the reception sensitivity of the configuration signal, and receive power from the selected source 110 wirelessly.

FIG. 2 illustrates a flat petal resonant structure including eight petals of a self-resonant device for a wireless power transmission system according to an embodiment.

Referring to FIG. 2, a self-resonant structure having a metamaterial characteristic of a self resonant device for a wireless power transmission system according to an embodiment includes a plurality of identical cells 210 to 280. It may have a multi-layer structure. Each cell 210 to 280 may be composed of a split-ring resonator SRR and a parallel capacitor.

Each cell 210 to 280 may be connected in series with a series capacitor. Every capacitor can be represented as a surface-mounted element.

The self-resonant structure can be designed as a combination of parallel resonant circuit and series capacitor. In this case, a represents a radius of each cell 210 to 280, and b represents a radius of a self-resonant device for a wireless power transmission system according to an embodiment.

3 illustrates a structure of a single split ring resonator of a self resonator for a wireless power transmission system according to an exemplary embodiment.

Referring to FIG. 3, the split ring resonator SRR 1 300 may have a circular shape having a groove 310.

SRR 1 300 may include thin metal strips 320 and 330 in a configuration. Metal strips 320 and 330, for example made of copper, may be located on top of the dielectric layer. The thickness b of the metal strip 320 and the metal strip 330, the strip between the metal strip 320 and the metal strip 330 may be less than the width a.

For example, 2r ₂ of FIG. 3 represents the diameter of SRR 1, a represents the width of the metal strip, and b represents the thickness of the metal strip.

Metal strips 320 and 330 at the corners of the groove 310 may be provided for vibration. The thickness of the dielectric layer may be in the range of 10um to 1500um. The dielectric permittivity of the dielectric layer may be a value in the range of 2 to 20.

In addition, SRR 1 300 may be implemented as a polygon consisting of any number of faces. The number of arbitrary faces may be determined according to the mounting technique of the capacitor connected with SRR 1 300.

4 illustrates an equivalent circuit of a single split ring resonator including a series capacitor and a parallel capacitor in a self resonator for a wireless power transmission system according to an embodiment.

Referring to FIG. 4, a self-resonant structure composed of a plurality of identical cells may be represented by an equivalent circuit.

Each cell may be represented by a parallel LC circuit including a parallel capacitor C ₁ 410 connected to SRR 1. The plurality of identical cells may be connected in series by a series capacitor C ₀ 420. The equivalent circuit of the above structure can be converted into a series connection circuit of a plurality of identical cells connected in series.

5 is a graph showing the relationship between the magnitude and frequency of the input impedance in the resonant cell according to an embodiment.

Referring to FIG. 5, in consideration of the equivalent circuit of FIG. 4, resonance in two cases may occur in a relationship between an input impedance and a frequency. The resonance of the two cases, there is a series resonance (generally "rectifying antenna (resonance)" known) (known in general "anti-resonance (antiresonance)") is, and the parallel resonance frequency f ₂ at a frequency f _1.

The resonance frequency f ₁ may correspond to a frequency at the minimum input impedance of the self-resonant device, and the frequency f ₂ may be a frequency when the maximum value of the input impedance is attained.

Resonance and anti-resonance in an oscillating system are typical of metamaterial resonant structures to provide a high quality factor of the system.

The resonance frequency may be determined by the impedance of SRR 1 calculated from the capacitor C ₀ 420 and the capacitor C ₁ 410 and the equivalent circuit of FIG. 4. The maximum efficiency of the energy transfer can be realized when operating at the resonant frequency f ₁ .

6 illustrates a metamaterial resonance structure according to an embodiment.

Referring to FIG. 6, a multi-layer self-resonant structure of metamaterial may be formed of a plurality of layers. The self-resonant structure may include a dielectric substrate 610, a first metal layer 620 corresponding to a split ring resonator (SRR), a capacitor 630 connected in parallel, and a capacitor 640 connected in series. have. The metal layer 620 may form an SRR topology together with the capacitor 630 and the capacitor 640. The first metal layer 620 is shorted by the parallel capacitor 630. Each SRR is connected in series by adjacent SRRs and a serial capacitor 640.

Elements located in different layers can be connected using metallized holes and connecting connectors.

Dielectric layers 610 each covered with a pattern of SRR are stacked one by one, wherein the stacked dielectric layers may rotate at a particular angle with respect to each layer as shown in FIG. 6. The dielectric layers may be stacked at positions rotated by a certain angle than the underlying dielectric layers.

The angle between two neighboring split ring resonators may be selected to the extent that provides sufficient space for the placement of capacitor 640 in series with the surface.

Each SRR and the serial capacitor 640 of the parallel capacitor 630 may be represented by an electrical equivalent circuit composed of parallel LC circuits connected in series with the serial capacitor 640.

Each parallel circuit may consist of an inductance in series with the active resistor and a capacitor in series with the active resistor.

7 illustrates an equivalent circuit of a self-resonant device for a wireless power transmission system having a multi-layer resonant structure according to an embodiment.

Referring to FIG. 7, the entire equivalent circuit of a self-resonant structure consists of a number of identical cells. Each cell may consist of an SRR and a parallel LC circuit including a parallel capacitor 710 coupled to the SRR. Here, SRR may be expressed as a single turn inductor. Multiple cells may be connected in series by a serial capacitor 720. The equivalent circuit of the above structure can be converted into a series connection circuit of several same cells connected in series.

Series connections between multiple SRRs provide high inductance and can assume high load impedance values. All inductors can be coupled by mutual inductance. Due to this coupling, the Q-factor of the self-resonant structure is increased.

FIG. 8 illustrates a layer-by-layer design of a self-resonant device for a wireless power transmission system having a multi-layer resonant structure according to another embodiment.

8, 1,2,... Referring to FIG. 6, a diagram of a single layer SRR constituting layers 810 in N multi-layer resonant structures is illustrated.

9 illustrates a multilayer self resonant structure including coupling capacitors of a self resonator device for a wireless power transfer system according to another embodiment.

10 illustrates a cross-sectional view of a multilayer self resonant structure including coupling capacitors according to one embodiment.

9 and 10, a circuit of a multi-layer self-resonant structure set shows a small size (<λ / 100, λ is a wavelength) and a high quality factor (Q-150 to 200). I can guarantee it.

The multilayer self resonant structure may operate in a frequency range of 1 to 100 MHz.

Using a large number of layers can increase the input impedance of a multilayer self-resonant structure and consequently increase the load resistance value.

To obtain a more uniform magnetic flux through the SRR 910, a magnetic rod (ferrite core) may be inserted along the common axis of the SRR 910.

The multi-layer self-resonant structure is characterized by the SRR 910 being a metal layer 911, a dielectric layer 912, via interconnection 913, surface mounted capacitor C ₀ (surface mounted). may be formed of a capacitor C0) (914), the parallel surfaces connecting the capacitor _{C 1 (surface mounted capacitor C1)} (915).

Each of the cells 910, 920, 930 may have the same structure and may be rotated at an exact angle with respect to each.

11 illustrates a metamaterial resonant structure including a magnetic rod according to an embodiment.

Referring to FIG. 11, in a metamaterial self-resonant structure comprising a magnetic rod, it has a uniform current distribution in the conducting layer of the SRR, and a more uniform magnetic inside the SRR. As the field has, the quality factor may increase.

When the magnetic rod 1110 is inserted into the SRR structure, the effective area of the SRR increases, and the effective coupling coefficient between the transmit and receive coils of the power transmission system increases.

The proposed self-resonant structure can be fabricated by low temperature co-fired ceramic technology or printed circuit board technology. Both techniques are suitable for the use of surface mounting techniques. The proposed structure can also be implemented without a surface mounted capacitor.

For dielectric materials, they have a relatively high permittivity ε _r , and the required capacitor value can be obtained by the capacitance of the inner layer represented by the aggregation of the capacitor in the substrate.

The proposed resonant structure can be used in portable wireless chargers for various electronic devices, including small devices. For example, a resonant structure proposed in a charger for a mobile phone can be used. In the medical field, the proposed resonant structures can be used in other electronic devices, including pacemakers, pacemakers or small devices.

The proposed self resonator can provide an improved resonant structure capable of constructing high inductance values in small devices. In addition, mutual inductance can occur anywhere between the positions of the inductive elements of the resonant structure, and the overall inductance of the structure can increase accordingly.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI &gt; or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (16)

Ring resonators,
The ring resonators are represented by combinations with metamaterial characteristics, the combinations comprising split-ring resonators connected in parallel with the capacitors, the split ring resonators being twisted alternately at the front and the rear, respectively ( each split ring resonator acts as a metal strip mounted on a dielectric layer, and is connected to a neighboring split ring resonator by a series capacitor.
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The split-ring resonators rotate, and the angle of rotation is selected such that a surface-mounted capacitor in series has an optimal space for the mount.
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The split-ring resonators are circular or polygonal
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The thickness of the dielectric layer has a value in the range of 50 micrometers (um) to 1500 micrometers (um).
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The dielectric constant of the dielectric layer is
Having a value in the range of 2 to 20
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The number of split ring resonators is at least two
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The operating frequency bands of the split ring resonators range from 1 MHz to 100 MHz.
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
Split-ring resonators connected in parallel with the capacitors are fabricated using low temperature co-fired ceramic technology or printed circuit board technology.
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
Each of the split-ring resonators connected in parallel with the capacitor includes an equivalent circuit composed of a parallel resonant LC circuit and a series capacitor.
Self-Resonant Device for Wireless Power Transmission System. 10. The method of claim 9,
The parallel resonant LC circuit includes an inductive element and a capacitive element, and is connected in series with an active reactance.
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The combination may be represented by an equivalent circuit including a plurality of cells,
Each cell comprises a parallel resonant circuit formed by a split-ring resonator and a capacitor connected in parallel,
The cells are connected in series by the series capacitor
Self-Resonant Device for Wireless Power Transmission System. 12. The method of claim 11,
The combination of the parallel resonant circuit and the series capacitor exhibits two resonant responses of typical impedance for metamaterials.
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The Q factor of the combination has a value in the range of 100 to 200.
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
A magnetic rod along the axis of the split ring resonator
Self-resonant device for a wireless power transmission system further comprising. 15. The method of claim 14,
The magnetic rod is composed of ferrite
Self-Resonant Device for Wireless Power Transmission System. The method of claim 1,
The capacitors are embedded inside the dielectric layer having a high dielectric constant.
Self-Resonant Device for Wireless Power Transmission System.

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