KR20120005113A - Apparatus and method for in-band wireless power transmission - Google Patents

Abstract

PURPOSE: An in-band wireless power transmitting device and method are provided to transmit the information of an in-band by controlling electric energy which is wirelessly transmitted and to enhance transmitting speed of transmitting information. CONSTITUTION: A transmitting part(201) wirelessly transmits electricity to a terminal(210). A receiving part receives electricity from a wireless power transmitting device. A controller(202) controls internal impedance by coping with terminal information which is transmitted to the wireless power transmitting device. The controller controls the reflected wave of a transmitting signal which is transmitted by the wireless power transmitting device. The controller modulates terminal information by changing the time point of a pulse having constant amplitude and location.

Description

In-band wireless power transmission apparatus and method {APPARATUS AND METHOD FOR IN-BAND WIRELESS POWER TRANSMISSION}

TECHNICAL FIELD The present invention relates to a wireless power transmission apparatus and method capable of transmitting and receiving information without a separate information transmission apparatus.

Recently, with the development of IT technology, various portable electronic products have been released, and their spread is also increasing. Due to the characteristics of portable electronic products, battery performance of the portable electronic products has emerged as an important issue. In addition to portable electronic products, household appliances are provided with a function of wirelessly transmitting data, but power is provided through a power line.

In addition, a wireless power transmission technology (wireless power transmission) that can supply power in recent years has been studied. Due to the characteristics of the wireless environment, the distance between the wireless power transmitter and the terminal is likely to change with time, and matching conditions of the resonators included in each of the wireless power transmitter and the terminal may also be changed. Therefore, in order to efficiently transmit power wirelessly, it is necessary to exchange information for power transmission between the wireless power transmitter and the terminal.

In one aspect, the in-band wireless power transmitter includes a transmitter for wirelessly transmitting power to a terminal and a control unit for controlling the amount of power wirelessly transmitted by the transmitter in response to transmission information transmitted to the terminal.

The controller may control the amount of power wirelessly transmitted by the transmitter by modulating the transmission information by varying the position of a pulse having a predetermined time width and amplitude with time.

The controller may control the amount of power wirelessly transmitted by the transmitter by modulating the transmission information by varying a time width of a pulse having a constant amplitude and position.

The controller may control the amount of power wirelessly transmitted by the transmitter by modulating the transmission information by changing amplitudes of pulses having a predetermined time width and position.

The controller may control the amount of power wirelessly transmitted by the transmitter by changing a frequency of a carrier to modulate the transmission information.

The controller may control the amount of power transmitted by the transmitter wirelessly by modulating the transmission information by multi-leveling the number of states that can be taken in modulation to two or more.

In one aspect, the terminal includes a receiver for receiving power wirelessly transmitted from the wireless power transmitter and a controller for controlling the internal impedance in response to the terminal information transmitted to the wireless power transmitter.

The controller may control the internal impedance by modulating the terminal information by changing a position of a pulse having a predetermined time width and amplitude according to time.

The controller may control the internal impedance by modulating the terminal information by changing a time width of a pulse having a constant amplitude and position.

The controller may control the internal impedance by modulating the terminal information by varying an amplitude of a pulse having a predetermined time width and position.

The controller may control the internal impedance by modulating the terminal information by multi-leveling the number of states that can be taken in modulation to two or more.

In one aspect, the in-band wireless power transmission method includes the step of wirelessly transmitting power to the terminal and the step of controlling the amount of power for wireless transmission in response to the transmission information transmitted to the terminal.

By controlling the amount of power for wireless transmission of the wireless power transmitter in response to the information to be transmitted, a method for transmitting information in-band without an additional device for information transmission is proposed.

By controlling the amount of power wirelessly transmitted through various modulation schemes in response to the transmission information, the transmission speed of the transmission information can be increased.

By controlling the internal impedance of the terminal in response to the information to be transmitted, by controlling the reflected wave of the transmission signal transmitted by the wireless power transmitter, a method for transmitting information without an additional device for information transmission is proposed.

Since no additional device is required, the amount of power consumption can be reduced, and a matching operation for matching a communication area for information exchange and a transmission area for wireless transmission of power can be omitted.

1 is a diagram illustrating a wireless power transmission system according to an embodiment.
2 is a diagram illustrating a configuration of an in-band wireless power transmitter according to an embodiment.
3 is a diagram illustrating a configuration of an in-band wireless power transmitter according to another embodiment.
4A is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to an embodiment.
4B is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to another embodiment.
4C is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to another embodiment.
4D is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to another embodiment.
5 is a diagram illustrating a configuration of an in-band wireless power transmission device according to another embodiment.
6 is a diagram illustrating a configuration of a terminal according to an embodiment.
7 is a diagram illustrating a configuration of a terminal according to another embodiment.
8 is a diagram illustrating a configuration of a terminal according to another embodiment.
9 illustrates a meta-structured resonator according to an embodiment.
FIG. 10 is a diagram illustrating an equivalent circuit of the resonator illustrated in FIG. 9.
11 is a diagram illustrating a meta-structured resonator according to another embodiment.
12 is a view showing in detail the insertion position of the capacitor of FIG.
13 is a flowchart illustrating an in-band wireless power transmission method according to an embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. Like reference numerals in the drawings denote like elements.

1 is a diagram illustrating a wireless power transmission system according to an embodiment.

In the example of FIG. 1, it is assumed that the wireless power transmitted through the wireless power transmission system is resonance power.

Referring to FIG. 1, a wireless power transmission system is a source-target structure consisting of a source and a target. That is, the wireless power transmission system includes a resonance power transmitter 110 corresponding to a source and a resonance power receiver 120 corresponding to a target.

The resonance power transmitter 110 includes a source unit 111 and a source resonator 115 that generate energy by receiving energy from an external voltage supply device. In this case, the external voltage source may be AC, DC, a battery, or the like. In addition, the resonance power transmission apparatus 110 may further include a matching control 113 that performs resonance frequency or impedance matching. In addition, the resonance power transmitter 110 may transmit data to the resonance power receiver 120 using the resonance frequency band. In addition, the resonance power transmission apparatus 110 may further include a matching network unit (not shown) to maximize the power delivered to the antenna for transmitting wireless power from an external voltage source. In this case, the power applied to the antenna is divided into the transmission power transmitted through the antenna and the reflected power reflected back. Since the reflected power should be minimized in order to increase the transmission efficiency, the resonance power transmitter 110 may include a sensing unit (not shown) capable of measuring the reflected power and a processor unit (not shown) to determine the matching parameter to minimize the reflected power. Or not).

The source unit 111 receives energy from an external voltage supply to generate resonance power. The source unit 111 rectifies an AC signal output from an AC-AC converter or an AC-AC converter for adjusting a signal level of an AC signal input from an external device to a desired level, thereby outputting a DC voltage having a predetermined level. It can include a DC-AC Inverter that generates an AC signal of several MHz to several tens of MHz band by fast switching the DC voltage output from the DC converter and the AC-DC converter. In addition, the source unit 111 may transmit the idle power to the target unit 125 while moving through the moving object rather than at a fixed position. For example, the source unit 111 may be included in a moving robot device.

The matching control 113 sets the resonance bandwidth of the source resonator 115 or the impedance matching frequency of the source resonator 115. The matching control unit 113 includes at least one of a source resonance bandwidth setting unit (not shown) or a source matching frequency setting unit (not shown). The source resonant bandwidth setting unit sets a resonance bandwidth of the source resonator 115. The source matching frequency setting unit sets the impedance matching frequency of the source resonator 115. In this case, the Q-factor of the source resonator 115 may be determined according to the resonance bandwidth of the source resonator or the impedance matching frequency of the source resonator.

The source resonator 115 transfers electromagnetic energy to the target resonator. That is, the source resonator 115 transmits the resonance power to the target device 120 through the magnetic coupling 101 with the target resonator 121. At this time, the source resonator 115 resonates within the set resonance bandwidth.

The resonance power receiver 120 includes a target resonator 121, a matching control unit 123 for performing resonance frequency or impedance matching, and a target unit 125 for transferring the received resonance power to a load. In addition, the resonance power receiver 120 may receive data from the resonance power transmitter 110 using the resonance frequency band.

The target resonator 121 receives electromagnetic energy from the source resonator 115. At this time, the target resonator 121 resonates within the set resonance bandwidth.

The matching control unit 123 sets at least one of a resonance bandwidth of the target resonator 121 or an impedance matching frequency of the target resonator 121. The matching control unit 123 includes at least one of a target resonance bandwidth setting unit (not shown) or a target matching frequency setting unit (not shown). The target resonance bandwidth setting unit sets a resonance bandwidth of the target resonator 121. The target matching frequency setting unit sets the impedance matching frequency of the target resonator 121. In this case, the Q-factor of the target resonator 121 may be determined according to the resonance bandwidth of the target resonator 121 or the impedance matching frequency of the target resonator 121.

The target unit 125 transfers the received resonance power to the load. At this time, the target unit 125 rectifies an AC signal received from the source resonator 115 to the target resonator 121 to generate a DC signal, and an AC-DC converter to adjust the signal level of the DC signal to adjust the device voltage. It may include a DC-DC converter that supplies a device or a load. The load capable of receiving the resonance power includes various home appliances including a digital photo frame, a speaker, a vacuum cleaner, a dryer, a shaver, a laptop PC, a computer, a peripheral device thereof, a mobile phone, a digital camera, a camcorder, an MP3 player, a PDA, and various portable devices. The device, in addition to the femtocell base station, various sensors and lighting equipment may be included.

The source resonator 115 and the target resonator 121 may be configured as a helix coil structure resonator, a spiral coil structure resonator, or a meta-structured resonator. The meta-structured resonator will be described in detail later with reference to FIG. 6.

Referring to FIG. 1, the control process of the cue-factor sets the resonance bandwidth of the source resonator 115 and the resonance bandwidth of the target resonator 121, and the source resonator 115 and the target resonator 121. And transferring electromagnetic energy from the source resonator 115 to the target resonator 121 through magnetic coupling therebetween. In this case, the resonance bandwidth of the source resonator 115 may be set to be wider or narrower than the resonance bandwidth of the target resonator 121. That is, since the resonance bandwidth of the source resonator 115 is set wider or narrower than the resonance bandwidth of the target resonator 121, the BW-factor of the source resonator and the BW-factor of the target resonator are maintained in an unbalanced relationship with each other. .

In resonant wireless power transmission, the resonance bandwidth is an important factor. When Qt is a Q-factor that considers the distance change between the source resonator 115 and the target resonator 121, the change in the resonance impedance, the impedance mismatch, the reflected signal, and the like, Qt is equal to the resonance bandwidth as shown in Equation 1 below. Have an inverse relationship.

[Equation 1]

는 대역폭,

는 공진기 사이의 반사 손실, BW_S는 소스 공진기(115)의 공진 대역폭, BW_D는 타겟 공진기(121)의 공진 대역폭을 나타낸다. 본 명세서에서 BW-factor는 1/ BW_S 또는 1/BW_D를 의미한다.In Equation 1, f0 is the center frequency,

Is the bandwidth,

Is the reflection loss between the resonators, BW _S is the resonance bandwidth of the source resonator 115, BW _D is the resonance bandwidth of the target resonator 121. In the present specification, the BW-factor means 1 / BW _S or 1 / BW _D.

On the other hand, impedance mismatching between the source resonator 115 and the target resonator 121 may occur due to external influences such as a change in distance between the source resonator 115 and the target resonator 121 or a change in one of the two positions. Can be. Impedance mismatch can be a direct cause of reducing the efficiency of power delivery. The matching control 113 may determine that impedance mismatch has occurred by sensing a reflected wave in which a part of the transmission signal is reflected and return, and perform impedance matching. In addition, the matching control 113 may change the resonance frequency by detecting the resonance point through the waveform analysis of the reflected wave. Here, the matching control 113 may determine a frequency having a minimum amplitude as the resonance frequency in the waveform of the reflected wave.

2 is a diagram illustrating a configuration of an in-band wireless power transmitter according to an embodiment.

2, the in-band wireless power transmitter 200 according to an embodiment of the present invention includes a transmitter 201 and a controller 202.

The in-band wireless power transmitter 200 may be any type of apparatus for wirelessly transmitting power to the terminal 210. In addition, the in-band wireless power transmission apparatus 200 may be implemented to be inserted into the terminal 210 in the form of a module.

The terminal 210 may be any type of device operated by a TV, a mobile phone, a game machine, a refrigerator, or other electric power.

The transmitter 201 may wirelessly transmit power to the terminal 210.

The controller 202 may control the amount of power wirelessly transmitted by the transmitter 201 in response to the transmission information 203 transmitted to the terminal 210. That is, the in-band wireless power transmitter 200 according to an embodiment of the present invention controls the amount of power wirelessly transmitted to the terminal 210 without a separate device for transmitting the transmission information 203 to the terminal 210. As a result, the transmission information 203 may be transmitted to the terminal 210. For example, when the transmission information 203 is 0, the control unit 202 may control to decrease the amount of power, and when the transmission information 203 is 1, the control unit 203 may control to increase the amount of power. In addition, the transmission information 203 is transmitted through the same frequency band as the power transmitted wirelessly. In this case, the case where the transmission information 203 is the same as the frequency band used for the wirelessly transmitted power is called in-band communication. The wireless power transmitter 200 according to an embodiment of the present invention is an in-band wireless power transmitter for transmitting power and transmission information 203 in the same frequency band using in-band communication.

The transmission information 203 is information that the in-band wireless power transmitter 200 intends to transmit to the terminal 210. The transmission information 203 is information about the in-band wireless power transmitter 200, such as ID, model, and type of the in-band wireless power transmitter 200, and the in-band wireless power transmitter 200 may wirelessly transmit power. It may include information about the transmission range and the information on whether the matching between the terminal 210 and the power when the wireless transmission. In addition, the transmission information 203 is not limited to information necessary for the in-band wireless power transmitter 200 to wirelessly transmit power to the terminal 210, and transmits in-band wireless power regardless of the content of information to be transmitted. The device 200 may include all the information to be transmitted to the terminal 210. According to an embodiment, the transmission information 203 may be binary data.

According to an embodiment of the present invention, the in-band wireless power transmitter 200 may further include an input unit (not shown) that receives the transmission information 203.

In addition, the controller 202 according to an embodiment may control the transmission frequency in response to the transmission information 203. The controller 202 may control the amount of power transmitted to the terminal 210 by controlling the transmission frequency. The controller 202 may include a phase locked loop circuit (PLL circuit), and may control a transmission frequency using the phase locked loop circuit.

In addition, the controller 202 according to an embodiment may control the internal impedance of the in-band wireless power transmitter 200 in response to the transmission information 203. The controller 202 may control the amount of power transmitted to the terminal 210 by controlling the internal impedance of the in-band wireless power transmitter 200.

3 is a diagram illustrating a configuration of a wireless power transmission apparatus according to another embodiment.

Referring to FIG. 3, the controller 310 of the in-band wireless power transmitter 300 according to an embodiment of the present invention may include a switch 320.

The switch 320 may block or apply power for wirelessly transmitting to the terminal in response to the transmission information 330. According to an embodiment, when the transmission information 330 is 0, the switch 320 is opened to cut off power for wireless transmission, and when the transmission information 330 is 1, the switch 320 is short. Power to wirelessly transmit).

4A is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to an embodiment.

The control unit according to an embodiment may control the amount of power wirelessly transmitted by the transmitter by modulating input transmission information by varying the position of a pulse having a predetermined time width and amplitude with time. Referring to FIG. 4A, the positions of the pulses representing data 1 and the pulses representing data 0 vary with time. However, the time width and amplitude of the two pulses are the same. As a result of summing up the amount of power wirelessly transmitted through the transmitter and the controlled amount of power to express the transmission information, only the portion representing data 1 and data 0 increases. Accordingly, the controller may modulate the transmission information represented by the binary data according to the time point of increasing the amount of power.

4B is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to another embodiment.

The control unit according to an embodiment may control the amount of power transmitted wirelessly by the transmitter in a manner of modulating input transmission information by varying a time width of a pulse having a constant amplitude and position. Referring to FIG. 4B, the duration of a pulse representing data 1 and a pulse representing data 0 are different. However, the amplitude and location of the two pulses are the same. As a result of summing the amount of power wirelessly transmitted through the transmitter and the amount of power controlled to express the transmission information, the range in which the amount of power increases is longer than the portion representing data 0 is longer than the portion representing data 0. Therefore, the controller may modulate the transmission information represented by the binary data through the duration of the value of which the amount of power is greater than or equal to a certain size.

4C is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to another embodiment.

The control unit according to an embodiment may control the amount of power transmitted by the transmitter wirelessly by changing the frequency of the carrier to modulate the input transmission information. Referring to FIG. 4C, the frequency magnitudes of the pulses representing data 1 and the pulses representing data 0 are different. The frequency of the section representing data 1 is greater than the frequency of the section representing data 0. Therefore, the controller may modulate the transmission information represented by the binary data according to the magnitude of the carrier frequency used for modulation. Here, the carrier frequency may include a transmission frequency used for wireless power transmission.

4D is a graph illustrating a control scheme applied to an in-band wireless power transmitter according to another embodiment.

According to an embodiment, the controller may control the amount of power wirelessly transmitted by the transmitter by modulating the transmission information by changing amplitudes of pulses having a predetermined time width and position. 4D, the amplitudes of the pulses representing data 1 and the pulses representing data 0 are different. As a result of summing the amount of power wirelessly transmitted through the transmitter and the controlled amount of power to represent the transmission information, the amplitude A of the amount of power representing data 1 has a larger value than the amplitude B of the amount of power representing data 0. That is, the controller may modulate the transmission information represented by the binary data by varying the amplitude of the pulse representing data 1 and the pulse representing data 0.

In addition, the controller according to an embodiment may control the amount of power transmitted by the transmitter wirelessly by modulating the transmission information by multi-leveling the number of states that can be taken in modulation to two or more. Here, multi-valued means to distinguish the number of states in which transmission information can be modulated according to the amount of power into two or more cases. The controller may modulate the transmission information represented by the binary data by varying the amplitude of the pulse having a predetermined time width and position, but multiplying the number of cases where the amplitude is different by two or more. That is, the controller may adjust the amount of power to modulate the transmission information through the multiplied level according to the value of the amount of power. For example, the controller may multiply and modulate the amplitude of the pulse in four cases to represent data 00, data 01, data 10, and data 11.

In addition, the control unit according to an embodiment modulates the transmission information using any one of phase shift modulation (PSK), quadrature amplitude modulation (QAM), which is a combination of phase and amplitude, and residual sideband amplitude modulation (VSB). Can be.

5 is a diagram illustrating a configuration of an in-band wireless power transmission device according to another embodiment.

Referring to FIG. 5, an in-band wireless power transmitter 500 according to an embodiment of the present invention may include a measuring unit 501 and an analyzing unit 502.

The in-band wireless power transmitter 500 transmits a transmission signal 520 to wirelessly transmit power to the terminal 510. In this case, there may exist a reflected wave 530 in which part of the transmission signal 520 is reflected.

The measurement unit 501 may measure the reflected wave 530 of the transmission signal 520 transmitted to the terminal 510. According to an embodiment, the measuring unit 501 may include a directional coupler measuring the reflected wave 530, and measure the reflected wave 530 using the directional coupler.

The analyzer 502 may analyze the terminal information 511 transmitted by the terminal 510 based on the reflected wave 530 measured by the measuring unit 501.

The terminal 510 according to an embodiment of the present invention may transmit the terminal information 511 to the in-band wireless power transmitter 500. Hereinafter, the terminal 510 transmitting the terminal information 511 will be described in detail with reference to FIG. 6.

6 is a diagram illustrating a configuration of a terminal according to an embodiment.

Referring to FIG. 6, the terminal 600 according to an embodiment of the present invention includes a receiver 601 and a controller 602.

The receiver 601 may wirelessly receive power from the in-band wireless power transmitter 610.

The controller 602 may control the internal impedance of the terminal 600 in response to the terminal information 603 transmitted to the in-band wireless power transmitter 610. That is, the terminal 600 according to an embodiment of the present invention controls the internal impedance of the terminal 600 without a separate device for transmitting the terminal information 603 to the in-band wireless power transmitter 610, By controlling the reflected wave 630 of the transmission signal 620 transmitted by the in-band wireless power transmitter 610, the terminal information 603 may be transmitted to the in-band wireless power transmitter 610. For example, when the terminal information 603 is 0, the controller 602 controls the internal impedance of the terminal 600 to increase the power of the reflected wave 630, and when the terminal information 603 is 1. The controller 602 may control the internal impedance of the terminal 600 to reduce the power of the reflected wave 630.

In addition, the controller 602 may control the internal impedance of the terminal 600 to increase or decrease the amplitude of the reflected wave in response to the terminal information 603. In this case, the controller 602 may control the internal impedance of the terminal 600 to increase or decrease the amplitude of the reflected wave by modulating the terminal information 603 by varying the position of a pulse having a predetermined time width and amplitude according to time. Can be. In addition, the controller 602 may control the internal impedance of the terminal 600 to increase or decrease the amplitude of the reflected wave by modulating the terminal information 603 by varying the time width of the pulse having a constant amplitude and position. . In addition, the controller 602 may control the internal impedance of the terminal 600 to increase or decrease the amplitude of the reflected wave by modulating the terminal information 603 by varying the amplitude of a pulse having a predetermined time width and position. . In addition, the controller 602 may control the internal impedance of the terminal 600 so that the amplitude of the reflected wave is increased or decreased by modulating the terminal information 603 by multiplying the number of states that may be taken in modulation to two or more. have.

The terminal information 603 is information that the terminal 600 wants to transmit to the in-band wireless power transmitter 610. The terminal information 603 includes information on whether the terminal 600 needs power at present, information on the amount of power required when the terminal 600 needs power, and in-band when receiving power wirelessly. It may include information on whether the matching with the wireless power transmission device 610 is well and information about the charging rate of the terminal 600. In addition, the terminal information 603 is not limited to information necessary for the terminal 600 to wirelessly receive power from the in-band wireless power transmitter 610, and the terminal 600 may be used regardless of the contents of the information to be transmitted. It may include all the information to be transmitted to the in-band wireless power transmitter 610. According to an embodiment, the terminal information 603 may be binary data.

According to one side of the present invention, the terminal 600 may further include an input unit (not shown) for receiving the terminal information 603.

Referring back to FIG. 5, the analyzer 502 transmits the data from the terminal 510 based on information on at least one of power increase or decrease in amplitude of the reflected wave 530 measured by the measurement unit 501. The terminal information 511 may be analyzed. In some embodiments, the in-band wireless power transmitter 500 may further include an output unit (not shown) for outputting the terminal information 503 analyzed by the analyzer 502.

7 is a diagram illustrating a configuration of a terminal according to another embodiment.

Referring to FIG. 7, the controller 710 of the terminal 700 according to an embodiment of the present invention may include a first load 720, a second load 730, and a switch 740. .

The switch 740 may be coupled to any one of the first load 720 and the second load 730 in response to the terminal information 750. According to an embodiment, when the terminal information 750 is 0, the switch 740 is coupled to the first load 720, and when the terminal information 750 is 1, the switch 740 is the second load 730. Can be combined.

8 is a diagram illustrating a configuration of a terminal according to another embodiment.

Referring to FIG. 8, the terminal 800 according to an embodiment of the present invention may include a measuring unit 801 and an analyzing unit 802.

The measurement unit 801 may measure the amount of power wirelessly received from the in-band wireless power transmitter 810.

The analyzer 802 may measure transmission information 811 transmitted by the in-band wireless power transmitter 810 based on the amount of power measured by the measurement unit 801. The analyzer 802 may analyze transmission information 811 transmitted by the in-band wireless power transmitter 810 based on the increase or decrease of the amount of power measured by the measurement unit 801. According to an exemplary embodiment, the terminal 800 may further include an output unit (not shown) for outputting the transmission information 803 analyzed by the analyzer 802.

9 illustrates a meta-structured resonator according to an embodiment.

Referring to FIG. 9, the meta-structured resonator includes a transmission line 910 and a capacitor 920. Here, the capacitor 920 is inserted in series at a specific position of the transmission line 910, and the electric field is trapped in the capacitor.

In addition, as shown in FIG. 9, the meta-structured resonator has a three-dimensional structure. Unlike in FIG. 9, the resonator may be implemented in a two-dimensional structure in which transmission lines are arranged in x and z planes.

The capacitor 920 is inserted into the transmission line 910 in the form of a lumped element and a distributed element, for example, an interdigital capacitor or a gap capacitor centered on a substrate having a high dielectric constant. As the capacitor 920 is inserted into the transmission line 910, the resonator may have a metamaterial characteristic.

Here, the metamaterial is a material having special electrical properties that cannot be found in nature, and has an artificially designed structure. The electromagnetic properties of all materials in nature have inherent permittivity or permeability, and most materials have positive permittivity and positive permeability. In most materials, the right-hand rule applies to electric fields, magnetic fields and pointing vectors, so these materials are called RHM (Right Handed Material). However, metamaterials are materials with a permittivity or permeability of less than 1, and according to the sign of permittivity or permeability, ENG (epsilon negative) material, MNG (mu negative) material, DNG (double negative) material, NRI (negative refractive index) Substances, and left-handed (LH) substances.

At this time, when the capacitance of the capacitor inserted as the lumped element is properly determined, the resonator may have the characteristics of the metamaterial. In particular, by appropriately adjusting the capacitance of the capacitor, the resonator may have a negative permeability, so that the resonator according to an embodiment of the present invention may be referred to as an MNG resonator.

The MNG resonator may have a zero-order resonance characteristic having a frequency when the propagation constant is 0 as a resonance frequency. Since the MNG resonator may have a zeroth resonance characteristic, the resonant frequency may be independent of the physical size of the MNG resonator. That is, as will be described again below, in order to change the resonant frequency in the MNG resonator, it is sufficient to design the capacitor appropriately, so that the physical size of the MNG resonator may not be changed.

In addition, in the near field, the electric field is concentrated on the series capacitor 920 inserted in the transmission line 910, so that the magnetic field is dominant in the near field due to the series capacitor 920. FIG.

In addition, the MNG resonator may have a high Q-Factor using the capacitor 920 to the lumped element, thereby improving the efficiency of power transmission.

In addition, the MNG resonator may include a matcher 930 for impedance matching. At this time, the matcher 930 is appropriately tunable to the strength of the magnetic field for coupling with the MNG resonator, the impedance of the MNG resonator is adjusted by the matcher 930. The current flows into or out of the MNG resonator through the connector 940.

In addition, although not explicitly illustrated in FIG. 9, a magnetic core penetrating the MNG resonator may be further included. Such a magnetic core may perform a function of increasing a power transmission distance. The characteristics of the MNG resonator of the present invention will be described in detail below.

FIG. 10 is a diagram illustrating an equivalent circuit of the resonator illustrated in FIG. 9.

The resonator shown in FIG. 9 may be modeled with the equivalent circuit shown in FIG. 10. In the equivalent circuit of FIG. 10, C _L represents a capacitor inserted in the form of a lumped element in the middle of the transmission line of FIG. 9.

를 공진 주파수로 갖는다고 가정한다. 이 때, 공진 주파수

는 하기 수학식 2와 같이 표현될 수 있다. 여기서, MZR은 Mu Zero Resonator를 의미한다.At this time, the resonator for wireless power transmission shown in FIG. 9 has a zeroth resonance characteristic. That is, when the propagation constant is 0, the resonator for wireless power transmission

Suppose we have a resonant frequency. At this time, the resonance frequency

May be expressed as Equation 2 below. Here, MZR means Mu Zero Resonator.

[Equation 2]

는

에 의해 결정될 수 있고, 공진 주파수

와 공진기의 물리적인 사이즈는 서로 독립적일 수 있음을 알 수 있다. 따라서, 공진 주파수

와 공진기의 물리적인 사이즈가 서로 독립적이므로, 공진기의 물리적인 사이즈는 충분히 작아질 수 있다.
Referring to Equation 2, the resonant frequency of the resonator

Is

Can be determined by the resonant frequency

It can be seen that the physical size of the and the resonator may be independent of each other. Thus, resonant frequency

Since the physical sizes of the and resonators are independent of each other, the physical sizes of the resonators can be sufficiently small.

11 is a diagram illustrating a meta-structured resonator according to another embodiment.

Referring to FIG. 11, the meta-structured resonator includes a transmission line unit 1110 and a capacitor 1120. In addition, the resonator according to an embodiment of the present invention may further include a feeding unit 1130.

In the transmission line unit 1110, a plurality of transmission line sheets are arranged in parallel. A configuration in which a plurality of transmission line sheets are arranged in parallel will be described in more detail with reference to FIG. 12.

The capacitor 1120 is inserted at a specific position of the transmission line unit 1110. In this case, the capacitor 1120 may be inserted in series at the interruption of the transmission line unit 1110. At this time, the electric field generated in the resonator is trapped in the capacitor 1120.

The capacitor 1120 may be inserted into the transmission line unit 1110 in the form of a lumped element and a distributed element, for example, an interdigital capacitor or a gap capacitor centered on a substrate having a high dielectric constant. As the capacitor 1120 is inserted into the transmission line unit 1110, the resonator may have a metamaterial characteristic.

The feeding unit 1130 may perform a function of supplying current to the MNG resonator. In this case, the feeding unit 1130 may be designed to distribute the current supplied to the resonator evenly to the plurality of transmission line sheets.

12 is a view showing in detail the insertion position of the capacitor of FIG.

Referring to FIG. 12, the capacitor 1120 is inserted into an interruption portion of the transmission line unit 1110. In this case, the interruption portion of the transmission line unit 1110 may be open so that the capacitor 1120 may be inserted, and each of the transmission line sheets 1110-1, 1110-2, and 1110-n may be formed. It can be configured in the form of parallel to each other at the stop.

13 is a flowchart illustrating an in-band wireless power transmission method according to an embodiment.

Referring to FIG. 13, the unmanned band line power transmission method according to an embodiment of the present invention may wirelessly transmit power to a terminal (S1310).

In addition, the in-band wireless power transmission method according to an embodiment of the present invention may control the amount of power for wireless transmission in response to the transmission information transmitted to the terminal (S1320). That is, the wireless power transmission method according to an embodiment of the present invention can transmit the transmission information to the terminal by controlling the amount of power wirelessly transmitted to the terminal, without a separate device for transmitting the transmission information to the terminal. For example, when the transmission information is 0, it may be controlled to reduce the amount of power, and when the transmission information is 1, it may be controlled to increase the amount of power.

According to one aspect of the invention, the in-band wireless power transmission method may further include receiving the transmission information.

In-band wireless power transmission method according to an embodiment may control the transmission frequency in response to the transmission information. By controlling the transmission frequency, the amount of power transmitted to the terminal can be controlled. In addition, the transmission frequency may be controlled using a phase locked loop circuit (PLL circuit).

In-band wireless power transmission method according to an embodiment may control the internal impedance (impedance) in response to the transmission information. By controlling the internal impedance, the amount of power transmitted to the terminal can be controlled.

In addition, the in-band wireless power transmission method according to an embodiment of the present invention can measure the reflected wave of the transmission signal transmitted to the terminal. In some embodiments, the reflected wave may be measured using a directional coupler measuring the reflected wave.

In addition, the in-band wireless power transmission method according to an embodiment of the present invention may analyze the terminal information transmitted by the terminal based on the measured reflected wave. According to an embodiment, the terminal information transmitted by the terminal may be analyzed based on the information on at least one of the increase or decrease of power or amplitude of the reflected wave. In some embodiments, the in-band wireless power transmission method may further include outputting the analyzed terminal information.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Claims (12)

A transmitter for wirelessly transmitting power to a terminal; And
Control unit for controlling the amount of power transmitted by the transmitter in response to the transmission information transmitted to the terminal
In-band wireless power transmission device comprising a. The method of claim 1,
The control unit
An in-band wireless power transmission apparatus for controlling the amount of power transmitted by the transmitter wirelessly by modulating the transmission information by varying the position of a pulse having a predetermined time width and amplitude with time. The method of claim 1,
The control unit
An in-band wireless power transmitter for controlling the amount of power transmitted by the transmitter wirelessly by modulating the transmission information by varying the time width of the pulse having a constant amplitude and position. The method of claim 1,
The control unit
An in-band wireless power transmitter for controlling the amount of power transmitted by the transmitter wirelessly by modulating the transmission information by varying the amplitude of the pulse having a predetermined time width and position. The method of claim 1,
The control unit
An in-band wireless power transmitter for controlling the amount of power transmitted by the transmitter wirelessly by changing the frequency of the carrier to modulate the transmission information. The method of claim 1,
The control unit
An in-band wireless power transmitter for controlling the amount of power transmitted by the transmitter wirelessly by modulating the transmission information by multi-leveling the number of states that can be taken in modulation to two or more. A receiver which wirelessly transmits power from a wireless power transmitter; And
Control unit for controlling the internal impedance in response to the terminal information transmitted to the wireless power transmission device
Terminal comprising a. The method of claim 7, wherein
The control unit
And controlling the internal impedance by modulating the terminal information by changing the position of a pulse having a constant time width and amplitude with time. The method of claim 7, wherein
The control unit
And controlling the internal impedance by modulating the terminal information by varying a time width of a pulse having a constant amplitude and position. The method of claim 7, wherein
The control unit
And controlling the internal impedance by modulating the terminal information by changing amplitudes of pulses having a predetermined time width and position. The method of claim 7, wherein
The control unit
A terminal for controlling the internal impedance by modulating the terminal information by multi-leveling the number of states that can be taken in the modulation to two or more. Wirelessly transmitting power to a terminal; And
Controlling the amount of power transmitted wirelessly by modulating the transmission information transmitted to the terminal
In-band wireless power transmission method comprising a.

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