WO2018208130A1 - Cooperative wireless power transfer system and method - Google Patents

Cooperative wireless power transfer system and method Download PDF

Info

Publication number
WO2018208130A1
WO2018208130A1 PCT/KR2018/005461 KR2018005461W WO2018208130A1 WO 2018208130 A1 WO2018208130 A1 WO 2018208130A1 KR 2018005461 W KR2018005461 W KR 2018005461W WO 2018208130 A1 WO2018208130 A1 WO 2018208130A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless power
phase
transmitters
signal
wireless
Prior art date
Application number
PCT/KR2018/005461
Other languages
French (fr)
Korean (ko)
Inventor
김용성
임용석
김동완
Original Assignee
전자부품연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 전자부품연구원 filed Critical 전자부품연구원
Priority claimed from KR1020180054374A external-priority patent/KR102220620B1/en
Publication of WO2018208130A1 publication Critical patent/WO2018208130A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/30—Circuit arrangements or systems for wireless supply or distribution of electric power using light, e.g. lasers

Definitions

  • the present invention relates to a wireless power transfer (WPT), and more particularly, to improve the safety of the human body while increasing the energy transmission efficiency in a wireless wireless power transmission system for transmitting wireless power using an array antenna. And a collaborative wireless power transfer system and method.
  • WPT wireless power transfer
  • most portable wireless communication devices are configured to be powered using a battery to support mobility.
  • the battery should be periodically charged, since the conventional battery charging is made of a wire, it is bound to limit the mobility and autonomy of the electronic device during the charging time.
  • the amount of power used by individuals has increased significantly, and user demand for a technology for freely charging a battery without a wired charger has increased.
  • the wireless power transmission technology converts electrical energy into RF signals of a specific frequency and wirelessly transmits them to a load without a transmission line.
  • the wireless power transmission technology may be classified into a near field wireless power transmission technology using a magnetic field and a long range wireless power transmission technology using an antenna according to electromagnetic waves.
  • Near-field wireless power transmission technology uses near-field, so non-radiative, and long-distance wireless power transmission uses far-field. It is called.
  • Dual WPT is a technology that uses Radio Frequency (RF) in the hundreds of M to several G bands as a power transmission medium, also called Microwave Power Transfer (MPT).
  • RF Radio Frequency
  • MPT Microwave Power Transfer
  • Microwave-based WPT systems cannot transmit power at high outputs, such as wired charging, and because they must transmit power within acceptable ranges based on electromagnetic wave protection standards (10 W / m 2 ) and unlicensed band power limits, provide fast charging speeds. It can not be expected, but at least tens of meters of remote power transmission is possible, and can maintain the survivability of the battery through the constant power transmission can reduce the inconvenience caused by frequent charging.
  • the receiver converts an RF power signal into a DC current and stores it in a battery.
  • a method of increasing reception power hereinafter, referred to as energy beamforming
  • energy beamforming using a beamforming technique of emitting microwaves to have directivity
  • the radio wave directivity can be improved in accordance with the antenna arrangement, and the transmission direction can be adjusted by controlling the phase of the carrier wave.
  • the reception power at the receiving end may be calculated by a Friss formula as shown in Equation 1 below.
  • P t is the transmit power
  • P r is the received power
  • ⁇ is the wavelength of the carrier on which the power signal is loaded
  • d is the separation distance between the transmitter and receiver
  • G t is the transmitter antenna gain
  • G r is the receiver antenna gain ( Gain).
  • Equation 1 in the wireless power transmission system, as the antenna size of the transmitting / receiving end is smaller and the transmission distance is farther away, the beam efficiency decreases, and the energy beamforming provides the effect of increasing the antenna gain, thereby transmitting the same transmission. Even when the output P t and the carrier are used, the reception power P r can be increased.
  • UBID unsafe beam-interception distance
  • the limit of exposure to electromagnetic waves near the transmitting end exceeds the standard, and the distance (UBID) from which the transmitting end can be approached is increased.
  • the reception power (charging power) is lowered in proportion.
  • the present invention has been proposed to solve the above-mentioned problems, and is a cooperative wireless power transmission system and method that can meet the human safety standards while improving energy transmission efficiency by transmitting distributedly with low power through a plurality of wireless power transmitters. To provide.
  • the present invention includes a plurality of wireless power transmitters that are distributed in different locations, and transmits an RF power signal based on energy beamforming, wherein the plurality of wireless power transmitters, Receiving the beacon signal transmitted from the wireless power receiver, to determine the position of one same wireless power receiver, calculates the phase difference between the wireless channel for the identified one wireless power receiver and the phase difference between the other wireless power transmitter, Provided is a cooperative wireless power transmission system characterized by correcting the phase of the RF power signal to receive a power signal of the same phase in one wireless power receiver.
  • the plurality of wireless power transmitters respectively, the number (N) of the plurality of wireless power transmitters, the electric field strength of the beacon signal received from the wireless power receiver, the proximity of people
  • the output power of the RF power signal may be adjusted in consideration of one or more of the above.
  • the plurality of wireless power transmitters may include one master wireless power transmitter, and the remaining wireless power transmitters other than the one master wireless power transmitter may receive the phase synchronization reference information from the master wireless power transmitter. Phase correction may be performed based on the received information.
  • the plurality of wireless power transmitters are connected to an array antenna and the array antenna, respectively, and receive beacon signals transmitted from the one wireless power receiver through the array antenna, and transmit power signals of a predetermined frequency band to the array antenna.
  • An RF signal processor for outputting the power signal to adjust a phase of a power signal output to the array antenna according to the control of the digital signal processor;
  • a digital signal processor that analyzes the received beacon signal and controls the RF signal processor to compensate for a phase difference between a plurality of wireless channels corresponding to each of the array antennas.
  • the plurality of wireless power transmitters may further include a communication interface unit for transmitting and receiving phase synchronization reference information to each other, and the digital signal processing unit may perform phase adjustment at the same time based on the information received through the communication interface unit.
  • the RF signal processing unit may be controlled to make it.
  • the present invention provides a cooperative wireless power transmission method using a plurality of wireless power transmitter that is distributed to different locations, and transmits the RF power signal based on the energy beamforming as another means for solving the above problems, Receiving, by the plurality of wireless power transmitters, a beacon signal transmitted from a wireless power receiver to identify a location of one same wireless power receiver; Calculating a phase difference between wireless channels for the identified one wireless power receiver and a phase difference between other wireless power transmitters, and correcting a phase of the RF power signal so that a power signal having the same phase is received at the one wireless power receiver. ; And transmitting a phase-corrected RF power signal to the wireless power receiver through an array antenna.
  • the RF power signal in consideration of one or more of the number (N) of the plurality of wireless power transmitters, the electric field strength of the beacon signal received from the wireless power receiver, the proximity of people. Adjusting the output power of may further include.
  • the correcting the phase may include setting one of the plurality of wireless power transmitters as a master wireless power transmitter and performing the rest of the wireless except for the one master wireless power transmitter.
  • the power transmitter may receive the phase synchronization reference information from the master wireless power transmitter and correct the phase difference between the master wireless power transmitters based on the received information.
  • distributed beamforming is performed on one wireless power receiver through collaboration between a plurality of physically distributed wireless power transmitters, thereby reducing transmission power in a wireless power transmitter by distributing transmission power in space.
  • the reception power of the wireless power receiver at the time of transmitting the RF power signal by the cooperative wireless power transmission system according to the present invention is larger than the reception power at the time of transmitting power using a single wireless power transmitter.
  • FIG. 1 is a block diagram showing a schematic structure of a cooperative wireless power transfer system according to the present invention.
  • FIG. 2 is a schematic diagram illustrating a comparison between the conventional wireless power transmission method and the cooperative wireless power transmission method according to the present invention.
  • FIG. 3 is a block diagram showing the configuration of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
  • FIG. 4 is a block diagram showing the configuration of a wireless power receiver in the cooperative wireless power transmission system according to the present invention.
  • FIG. 5 is a schematic diagram showing an example of a cooperative wireless power transmission system according to the present invention.
  • FIG. 6 is a schematic diagram illustrating output weight control of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
  • FIG. 7 is a view for explaining a phase difference compensation concept of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
  • FIG. 8 is a diagram illustrating a configuration for phase compensation of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
  • FIG. 9 is a view for explaining phase synchronization between wireless power transmitters in the cooperative wireless power transmission system according to the present invention.
  • FIG. 10 is a diagram illustrating a phase synchronization method between wireless power transmitters in a cooperative wireless power transmission system according to the present invention.
  • first and second are used to describe various components, and are used only to distinguish one component from another component, and to limit the components. Not used.
  • the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
  • a component when referred to as being "connected” or “connected” to another component, it means that it may be connected or connected logically or physically. In other words, although a component may be directly connected or connected to other components, it should be understood that other components may exist in the middle, and may be connected or connected indirectly.
  • the cooperative wireless power transmission system according to the present invention includes a plurality of wireless power transmitters 100 and a single radio. And a power receiver 200.
  • the plurality of wireless power transmitters 100 are distributed in different locations and transmit energy beamforming-based power signals toward one wireless power receiver 200.
  • the plurality of wireless power transmitters 100 compensate for phase synchronization between each other and a phase difference between wireless channels, and control the power signals of the same phase to be received by the one wireless power receiver.
  • the cooperative wireless power transmission system of the present invention transmits power to be provided by one wireless power receiver 200 through cooperative and distributed beamforming through a plurality of wireless power transmitters 100.
  • the plurality of wireless power transmitters 100 transmit the required maximum output Pt.
  • each wireless power transmitter may transmit a power signal of Pt / 4, and thus, in each wireless power transmitter 100.
  • the maximum output of the power signal to be transmitted can be lowered, and as a result, the risk of exposure to the user's electromagnetic waves can be reduced.
  • the plurality of wireless power transmitters 100 should be able to compensate phase offsets between wireless channels between the transmitting end and the receiving end, and in addition, other wireless power transmitters. It should be possible to perform phase synchronization to compensate for the phase difference with (100).
  • the plurality of wireless power transmitters 100 are physically spaced apart from each other by a predetermined distance, thereby preventing the energy from rising in a specific region.
  • FIG. 3 is a block diagram showing the configuration of each wireless power transmitter 100 in the cooperative wireless power transmission system according to the present invention.
  • the wireless power transmitter 100 for building a cooperative wireless power transmission system includes an array antenna 110, an RF (Radio Frequency) signal processing unit 120, and a digital signal processing unit ( 130, and a communication interface 140.
  • RF Radio Frequency
  • the array antenna 110 is formed of a plurality of antenna elements arranged at regular intervals, and may transmit a radio signal through different paths through each antenna element.
  • the RF signal processing unit 120 is connected to the array antenna 110, receives the beacon signal transmitted from the one wireless power receiver 200 through the array antenna 110, and predetermined as the array antenna. Outputs a power signal of the frequency band, and adjusts the phase of the power signal output to the array antenna according to the control of the digital signal processor 130.
  • the digital signal processor 130 is connected to the RF signal processor 120 and is a component for processing and controlling a baseband signal and may include one or more microprocessors or processing modules.
  • the digital signal processor 130 controls the RF signal processor to analyze the received beacon signal and compensate for a phase difference between a plurality of wireless channels corresponding to each of the array antennas.
  • the communication interface 140 is a component for transmitting and receiving phase synchronization reference information for phase synchronization with another wireless power transmitter 100.
  • the communication interface 140 may transmit or receive a signal (information) by connecting between other wireless power transmitters 100 by wire or wirelessly.
  • the digital signal processor 130 may control the RF signal processor 120 to perform phase adjustment at the same time based on the phase synchronization reference information received through the communication interface 140.
  • phase synchronization reference information shared between the wireless power transmitters 100 may be phase offset information between the wireless power transmitters 100 and the wireless power receiver 200.
  • FIG. 4 is a block diagram showing the configuration of the wireless power receiver 200 in the cooperative wireless power transmission system according to the present invention.
  • the wireless power receiver 200 includes an antenna unit 210 and a power receiver 220 to receive RF power signals transmitted from the plurality of wireless power transmitters 100. After receiving through 210, the received RF power signal is converted into DC current through the power receiver 220 and output.
  • the power receiver 220 may include an impedance matching circuit, an amplifier circuit, a capacitor, and the like.
  • the wireless power receiver 200 further includes a beacon signal transmitter 230 so that the plurality of wireless power transmitters 100 can identify their positions and detect a phase difference on a path. Send out periodically.
  • the beacon signal is also called a training sequence or pilot signal.
  • the wireless power receiver 200 may transmit the beacon signal periodically or aperiodically when the reception energy is lower than a specific level.
  • the specific level that determines the period in which the beacon signal is transmitted and the case in which it is sent aperiodically is determined by the wireless power receiver 200.
  • FIG. 5 is a schematic diagram showing an example of a cooperative wireless power transmission system according to the present invention.
  • the cooperative wireless power transmission system according to the present invention performs distributed beamforming on a power signal through four wireless power transmitters 100a, 100b, 100c and 100d.
  • the number of the wireless power transmitter 100 used for the cooperative wireless power transmission is only an example, and may vary depending on the environment of the applied location.
  • the four wireless power transmitters 100a, 100b, 100c, and 100d calculate the position of the wireless power receiver 200 to transmit wireless power before performing the wireless power transmission.
  • the wireless power receiver 200a is set as a power transmission target.
  • the four wireless power transmitters 100a, 100b, 100c, and 100d divide and transmit the maximum output Pt required for fast charging of the wireless power receiver 200a.
  • the initial output of the multiple wireless power transmitters 100 may be set to Pt / N (where N is the number of wireless power transmitters performing the collaboration) and ,
  • N is the number of wireless power transmitters performing the collaboration
  • the movement of the wireless power receiver 200, the distance between each wireless power transmitter 100 and the wireless power receiver 200 that is, the distance between the transmitting end and the receiving end), a person or an object on a wireless path, or the like. It can be adjusted according to the environment.
  • the four wireless power transmitters 100a, 100b, 100c, and 100d are configured to be able to scale the power of the transmission output during power transmission.
  • the wireless power transmitter 200a may be used.
  • the strength of the received beacon signal is relatively smaller than the strength of the beacon signal received by the other wireless power transmitters 100b and 100c.
  • the plurality of wireless power transmitters 100a, 100b, 100c, and 100d when the plurality of wireless power transmitters 100a, 100b, 100c, and 100d according to the present invention receive a beacon signal of the target wireless power receiver 200a and determine a location, the plurality of wireless power transmitters 100a, 100b, 100c, and 100d check the strength of the received beacon signal. Therefore, the magnitude of the output power is adjusted.
  • the plurality of wireless power transmitters 100a, 100b, 100c, and 100d set the transmission power to ⁇ P t (where ⁇ is the output weight and Pt is the maximum output of the wireless power transmitter), and the beacon signal
  • ⁇ is the output weight
  • Pt is the maximum output of the wireless power transmitter
  • the plurality of wireless power transmitters 100a, 100b, 100c, and 100d communicate with each other through the communication interface unit 140 to cooperate with each other (N) of wireless power transmitters 100 and other wireless power transmitters ( Beacon signal strength at 100) can be confirmed.
  • FIG. 6 is a schematic diagram illustrating output weight control of each wireless power transmitter in the cooperative wireless power transmission system illustrated in FIG. 5.
  • the output weights of the four wireless power transmitters 100a, 100b, 100c, and 100d are ⁇ 1 , ⁇ 2 , ⁇ 3 , and ⁇ 4 , respectively, and each transmission power is ⁇ 1 P t , ⁇ 2 P t , ⁇ 3 P t , ⁇ 4 P t .
  • the wireless power transmitter 100a reduces the transmission output by adjusting the output weight ⁇ 1 .
  • the output weight may be increased in the remaining wireless power transmitters 100b, 100c, and 100d, thereby increasing the output power.
  • This process may be equally applied to the change of the distance between the transmitter and the receiver according to the movement of the wireless power receiver 200a.
  • the receiving distance of the beacon signal decreases as the distance increases, so that output power can be increased by increasing the output weight.
  • the plurality of wireless power transmitters 100 may further include a means (proximity sensor, etc.) for detecting the proximity of a person.
  • each output weight may be adjusted such that 0 ⁇ 1 + ⁇ 2 + ⁇ 3 + ⁇ 4 ⁇ 1, most preferably 1.
  • the plurality of wireless power transmitters 100a, 100b, 100c, and 100d may perform phase difference between wireless channels from a beacon signal received from the wireless power receiver 200a to correct phase offset between wireless channels with the radio power receiver 200a. And calculate the phase of the power signal for each of the plurality of antenna elements of the array antenna 110 to compensate the calculated phase difference.
  • FIG. 7 is a diagram for describing a concept of compensation for phase difference between wireless channels of the wireless power transmitter 100 in the cooperative wireless power transmission system according to the present invention.
  • the phases of the various RF power signals received by the wireless power receiver 200 coincide with each other. If you do, the sum is the largest. Therefore, in order to increase the received power in the wireless power receiver 200, the transmission delay ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , at which the RF power signal transmitted in the multipath arrives at the receiver, is estimated and transmitted.
  • the phases of the power to be transmitted by the delays ⁇ 1 , ⁇ 2 , ⁇ 3 , and ⁇ 4 should be transmitted after correction.
  • the wireless power transmitter 100 analyzes the received beacon signal, estimates a transmission delay value to the wireless power receiver 200, and based on this, precompensates for the power signal of each wireless channel in advance. -phase compensation) to transmit.
  • the wireless power transmitter 100 may be configured as shown in FIG.
  • FIG. 8 is a diagram illustrating a configuration for phase compensation of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
  • the RF signal processor 120 of the wireless power transmitter 100 includes a power splitter, a phase shifter, and an amplifier, and a digital signal.
  • the phases of the power signals V 1 , V 2 , V 3 , and V 4 output to each antenna element of the array antenna 110 may be adjusted.
  • the cooperative wireless power transmission system by distributing a plurality of wireless power transmitter 100 for transmitting a multi-path RF power signal through energy beamforming using an array antenna, a plurality of wireless power transmitter 100 Through distributed beamforming is performed.
  • phase of the RF power signal transmitted from each of the plurality of wireless power transmitters 100 may vary, as shown in FIG. 9.
  • the dotted line represents the waveform of the RF power signal received from the wireless power transmitter 100a
  • the solid line represents the waveform of the RF power signal received from the wireless power transmitter 100b.
  • each wireless power transmitter 100 compensates for the phase difference between the wireless channels, due to differences in the physical location and the propagation environment of the plurality of wireless power transmitters 100 A phase difference also occurs between the power transmitters 100.
  • the plurality of wireless power transmitters 100 should perform mutual time synchronization. That is, the phase difference calculated by analyzing the beacon signal of each wireless power transmitter 100 is a value reflecting only the phase difference according to the wireless channel of the corresponding wireless power transmitter 100, and the phase synchronization between the wireless power transmitters 100 is wireless.
  • the power transmitted by the power transmitter 100 is received at the wireless power receiver 200, it is made to have the same phase. Synchronization between a plurality of wireless power transmitters 100 is very important for efficient distributed beamforming in the cooperative wireless power transmission system according to the present invention.
  • FIG. 10 is a diagram illustrating a method for phase synchronization between a plurality of wireless power transmitters 100 in a cooperative wireless power transmission system according to the present invention.
  • any particular node of the plurality of wireless power transmissions 100 may be a master node for phase synchronization between the plurality of wireless power transmitters 100. (Hereinafter referred to as a master wireless power transmitter).
  • a master wireless power transmitter In the example of FIG. 10, it is assumed that the wireless power transmitter 100a is a master wireless power transmitter.
  • the master wireless power transmitter 100a is a node for managing phase synchronization between the wireless power transmitters 100, and transmits its phase offset as phase synchronization reference information to other wireless power transmitters 100b, 100c, and 100d. do.
  • the plurality of wireless power transmitters 100 are wired or wirelessly connected to each other through the communication interface 140.
  • the other wireless power transmitters 100b, 100c, and 100d calculate a phase difference with the master wireless power transmitter 100a by comparing the received phase synchronization reference information. And, based on the phase synchronization reference information, the wireless power receiver 200 adjusts the phase of the RF power signal transmitted by itself so that the zero phase.
  • the master wireless power transmitter 100a may be changed, and when the master wireless power transmitter is changed, the phase synchronization process should be repeated based on the new master node.
  • the present invention is applied to an energy beamforming-based wireless power transmission system, by performing distributed beamforming on one wireless power receiver through collaboration between a plurality of physically distributed wireless power transmitters, thereby transmitting power in space. It is possible to reduce the transmission power from the wireless power transmitter by dispersing, thereby increasing the transmission efficiency to the wireless power receiver while satisfying human safety standards.
  • the reception power of the wireless power receiver at the time of transmitting the RF power signal by the cooperative wireless power transmission system according to the present invention is larger than the reception power at the time of transmitting power using a single wireless power transmitter.

Abstract

The present invention relates to a cooperative wireless power transfer system and method which can increase energy transmission efficiency and satisfy human safety standards by transferring low power in a distributed manner through a plurality of wireless power transmitters, the system comprising a plurality of wireless power transmitters distributed over different locations so as to transmit RF power signals on the basis of energy beamforming, wherein the plurality of wireless power transmitters receive a beacon signal transmitted from a wireless power receiver so as to identify the location of the same single wireless power receiver, calculate, for the identified single wireless power receiver, phase differences between wireless channels and phase differences between different wireless power transmitters, and calibrate the phases of the RF power signals so as to allow the single wireless power receiver to receive power signals having the same phase.

Description

협업 무선 전력 전송 시스템 및 방법Collaborative wireless power transfer system and method
본 발명은 무선 전력 전송(WPT: Wireless Power Transfer)에 관한 것으로서, 더욱 상세하게는 배열 안테나를 이용하여 무선 전력을 전송하는 방사형 무선전력전송시스템에서의 에너지 전송 효율을 높이면서 인체의 안전성을 향상시킬 수 있는 협업 무선 전력 전송 시스템 및 방법에 관한 것이다.The present invention relates to a wireless power transfer (WPT), and more particularly, to improve the safety of the human body while increasing the energy transmission efficiency in a wireless wireless power transmission system for transmitting wireless power using an array antenna. And a collaborative wireless power transfer system and method.
최근 무선 통신 분야의 발전과 함께 다양한 휴대용 무선 통신 기기들의 이용이 급증하면서, 무선 통신 기기들의 활용 지속 시간에 큰 영향을 미치는 전원 공급 기술에 대한 관심이 증가하고 있다.Recently, as the use of various portable wireless communication devices has rapidly increased with the development of the wireless communication field, interest in a power supply technology that greatly affects the duration of use of wireless communication devices is increasing.
보편적으로, 대다수의 휴대용 무선 통신 기기들은, 이동성을 지원하기 위해서 배터리를 이용하여 전원을 공급받도록 구성된다. 그런데, 배터리의 용량 한계로 인하여, 주기적으로 배터리 충전이 이루어져야 하는데, 기존의 배터리 충전은 유선으로 이루어지기 때문에, 충전 시간 동안 전자기기의 이동성과 자율성을 제한할 수 밖에 없다. 특히, 스마트폰의 대중화에 따라 개인이 사용하는 전력량이 크게 증가하게 되면서 유선충전기 없이 자유롭게 배터리를 충전할 수 있는 기술에 대한 사용자 요구가 증가하게 되었다. Typically, most portable wireless communication devices are configured to be powered using a battery to support mobility. However, due to the capacity limitation of the battery, the battery should be periodically charged, since the conventional battery charging is made of a wire, it is bound to limit the mobility and autonomy of the electronic device during the charging time. In particular, with the popularity of smart phones, the amount of power used by individuals has increased significantly, and user demand for a technology for freely charging a battery without a wired charger has increased.
이에, 전자기기에 무선으로 에너지를 공급하기 위한 연구 및 개발이 학계와 산업분야에서 활발하게 이뤄지고 있으며, 대표적인 기술로서 무선 전력 전송(WPT: Wireless Power Transfer) 기술이 대두되고 있다. 무선 전력 전송 기술은 전기에너지를 특정 주파수의 RF신호로 변환하여 전송선 없이 무선으로 부하(Load)에 전달하는 기술이다. 이러한 무선전력전송 기술은 전자파 특성에 따라, 자기장을 이용하는 근거리 무선전력전송 기술과 안테나를 이용한 원거리 무선전력전송 기술로 구분할 수 있다. 근거리 무선전력전송 기술의 경우 근역장(Near-Field)을 이용하기 때문에 비방사형(non-radiative), 원거리 무선전력전송의 경우 원역장(Far-Field)을 이용하기 때문에 방사형(radiative) 무선전력전송이라고 불린다.Accordingly, research and development for wirelessly supplying energy to electronic devices have been actively conducted in academic and industrial fields, and wireless power transfer (WPT) technology has emerged as a representative technology. The wireless power transmission technology converts electrical energy into RF signals of a specific frequency and wirelessly transmits them to a load without a transmission line. The wireless power transmission technology may be classified into a near field wireless power transmission technology using a magnetic field and a long range wireless power transmission technology using an antenna according to electromagnetic waves. Near-field wireless power transmission technology uses near-field, so non-radiative, and long-distance wireless power transmission uses far-field. It is called.
이중, 방사형 WPT는 전력 전달 매체로서 수백M ~ 수G 대역의 RF(Radio Frequency)를 이용한 기술로, Microwave Power Transfer(MPT)라고도 한다. Dual WPT is a technology that uses Radio Frequency (RF) in the hundreds of M to several G bands as a power transmission medium, also called Microwave Power Transfer (MPT).
마이크로웨이브 기반의 WPT 시스템은 유선 충전처럼 고출력으로 전력을 전송할 수는 없고, 전자파 인체보호기준(10W/m2) 및 비면허대역 출력제한치의 근거한 허용범위 내에서 전력을 전송해야 하기 때문에 빠른 충전 속도를 기대할 수는 없으나, 최소 수십 미터 이상의 원거리 전력 전송이 가능하며, 상시전력전송을 통하여 배터리의 생존성을 유지할 수 있기 때문에 잦은 충전에 따른 불편함을 줄일 수 있다.Microwave-based WPT systems cannot transmit power at high outputs, such as wired charging, and because they must transmit power within acceptable ranges based on electromagnetic wave protection standards (10 W / m 2 ) and unlicensed band power limits, provide fast charging speeds. It can not be expected, but at least tens of meters of remote power transmission is possible, and can maintain the survivability of the battery through the constant power transmission can reduce the inconvenience caused by frequent charging.
마이크로웨이브 기반의 무선 전력 전송 시스템은, 송신측에서 무선 채널 환경에 적합한 주파수로 전력 신호를 변환하여 송신하면, 수신측에서 RF 전력 신호를 DC 전류로 변환하여 배터리에 저장하는 방식으로 이루어지며, 최근 마이크로웨이브를 지향성을 갖도록 방사하는 빔포밍(Beamforming) 기술을 활용하여 수신 전력을 증가시키는 방식(이하, 에너지 빔포밍이라 함)이 연구되고 있다.In the microwave-based wireless power transmission system, when a transmitter converts and transmits a power signal to a frequency suitable for a wireless channel environment, the receiver converts an RF power signal into a DC current and stores it in a battery. A method of increasing reception power (hereinafter, referred to as energy beamforming) using a beamforming technique of emitting microwaves to have directivity has been studied.
에너지 빔포밍 기술은, 복수의 배열 안테나를 소정 간격으로 배치함으로써, 안테나 배열에 따라서 전파 지향 특성을 높일 수 있으며, 반송파의 위상을 제어함으로써, 송출 방향을 조정할 수 있다.In the energy beamforming technique, by arranging a plurality of array antennas at predetermined intervals, the radio wave directivity can be improved in accordance with the antenna arrangement, and the transmission direction can be adjusted by controlling the phase of the carrier wave.
무선 전력 전송 시스템에 있어서, 수신단에서의 수신 전력은 하기의 수학식 1과 같이 Friss formula에 의해 산출될 수 있다.In the wireless power transmission system, the reception power at the receiving end may be calculated by a Friss formula as shown in Equation 1 below.
Figure PCTKR2018005461-appb-M000001
Figure PCTKR2018005461-appb-M000001
여기서, Pt는 송신출력, Pr은 수신전력, λ는 전력신호가 실린 반송파의 파장, d는 송신단과 수신단 간의 이격거리, Gt는 송신단 안테나 이득(Gain), Gr은 수신단 안테나 이득(Gain)을 의미한다. Where P t is the transmit power, P r is the received power, λ is the wavelength of the carrier on which the power signal is loaded, d is the separation distance between the transmitter and receiver, G t is the transmitter antenna gain, and G r is the receiver antenna gain ( Gain).
상기 수학식 1에 따르면, 무선 전력 전송 시스템에서, 송/수신단의 안테나 크기가 작을수록, 전송거리가 멀어질수록 빔효율은 감소하는데, 에너지 빔포밍은 안테나 이득을 높이는 효과를 제공하여, 동일한 송신출력(Pt)과 반송파를 사용하더라도 수신전력(Pr)을 높일 수 있다.According to Equation 1, in the wireless power transmission system, as the antenna size of the transmitting / receiving end is smaller and the transmission distance is farther away, the beam efficiency decreases, and the energy beamforming provides the effect of increasing the antenna gain, thereby transmitting the same transmission. Even when the output P t and the carrier are used, the reception power P r can be increased.
그런데 이러한 에너지 빔포밍 기술을 적용하더라도, 전자파 인체보호기준(10W/m2)과 전파응용설비 출력제한치에 근거한 허용범위 내에서 전력을 전송해야 하기 때문에, 송신출력에 제한을 받게 된다. 특히, 에너지 빔포밍을 통해 빔이 지향성을 갖는 경우, UBID(unsafe beam-interception distance)가 길어지는 단점이 있다. UBID는 안전하지 않은 빔 차단 거리를 의미하며 빔 출력 밀도가 인체 노출 한계를 초과하는 최대 전파 거리로 정의할 수 있다. However, even if the energy beamforming technology is applied, transmission power is limited because power must be transmitted within an allowable range based on the electromagnetic wave human body protection standard (10W / m 2 ) and the radio wave application equipment output limit value. In particular, when the beam has directivity through energy beamforming, there is a disadvantage that the unsafe beam-interception distance (UBID) is long. UBID stands for unsafe beam cutoff distance and can be defined as the maximum propagation distance where the beam power density exceeds the human exposure limit.
송신단에서 에너지 빔포밍을 하게 되면, 송신단 근처에서 전자파에 노출되는 한계치가 규격을 넘어가게 되고, 그만큼 송신단에 접근할 수 있는 거리(UBID)가 멀어지며, 이와 반대로 인체 안정성을 높이기 위하여 송신단의 출력을 낮출 경우, 그에 비례하여 수신전력(충전 전력)이 낮아진다. When energy beamforming is performed at the transmitting end, the limit of exposure to electromagnetic waves near the transmitting end exceeds the standard, and the distance (UBID) from which the transmitting end can be approached is increased. When lowered, the reception power (charging power) is lowered in proportion.
본 발명은 상술한 문제점을 해결하기 위하여 제안된 것으로서, 다수의 무선 전력 송신기를 통해서 낮은 전력으로 분산하여 전송함으로써, 에너지 전송 효율을 높이면서 인체 안정성 규격을 충족시킬 수 있는 협업 무선 전력 전송 시스템 및 방법을 제공하고자 한다.The present invention has been proposed to solve the above-mentioned problems, and is a cooperative wireless power transmission system and method that can meet the human safety standards while improving energy transmission efficiency by transmitting distributedly with low power through a plurality of wireless power transmitters. To provide.
상술한 과제를 해결하기 위한 수단으로서, 본 발명은, 서로 다른 위치에 분산 배치되어, 에너지 빔포밍 기반으로 RF 전력 신호를 송출하는 다수의 무선 전력 송신기를 포함하며, 상기 다수의 무선 전력 송신기는, 무선 전력 수신기로부터 송출된 비콘 신호를 수신하여, 하나의 동일한 무선 전력 수신기의 위치를 확인하고, 상기 확인된 하나의 무선 전력 수신기에 대한 무선 채널 간의 위상차 및 다른 무선 전력 송신기 간의 위상차를 산출하여, 상기 하나의 무선 전력 수신기에서 동일한 위상의 전력 신호가 수신되도록 상기 RF 전력 신호의 위상을 보정하는 것을 특징으로 하는 협업 무선 전력 전송 시스템을 제공한다.As a means for solving the above problems, the present invention includes a plurality of wireless power transmitters that are distributed in different locations, and transmits an RF power signal based on energy beamforming, wherein the plurality of wireless power transmitters, Receiving the beacon signal transmitted from the wireless power receiver, to determine the position of one same wireless power receiver, calculates the phase difference between the wireless channel for the identified one wireless power receiver and the phase difference between the other wireless power transmitter, Provided is a cooperative wireless power transmission system characterized by correcting the phase of the RF power signal to receive a power signal of the same phase in one wireless power receiver.
본 발명에 따른 협업 무선 전력 전송 시스템에 있어서, 상기 다수의 무선 전력 송신기는 각각, 상기 다수의 무선 전력 송신기의 개수(N), 상기 무선 전력 수신기로부터 수신된 비콘 신호의 전계 강도, 사람의 근접 여부 중 하나 이상을 고려하여 상기 RF 전력 신호의 송출 전력을 조정할 수 있다.In the cooperative wireless power transmission system according to the present invention, the plurality of wireless power transmitters, respectively, the number (N) of the plurality of wireless power transmitters, the electric field strength of the beacon signal received from the wireless power receiver, the proximity of people The output power of the RF power signal may be adjusted in consideration of one or more of the above.
또한, 상기 다수의 무선 전력 송신기는, 하나의 마스터 무선 전력 송신기를 포함하고, 상기 하나의 마스터 무선 전력 송신기를 제외한 나머지 무선 전력 송신기가, 상기 마스터 무선 전력 송신기로부터 상기 위상 동기 기준 정보를 수신하고, 수신한 정보를 기준으로 위상 보정을 수행할 수 있다.The plurality of wireless power transmitters may include one master wireless power transmitter, and the remaining wireless power transmitters other than the one master wireless power transmitter may receive the phase synchronization reference information from the master wireless power transmitter. Phase correction may be performed based on the received information.
상기 다수의 무선 전력 송신기는, 각각 배열 안테나, 상기 배열 안테나에 연결되어, 상기 배열 안테나를 통해 상기 하나의 무선 전력 수신기로부터 송출된 비콘 신호를 수신하고, 상기 배열 안테나로 소정 주파수 대역의 전력 신호를 출력하되, 하기의 디지털 신호 처리부의 제어에 따라서 상기 배열 안테나로 출력되는 전력 신호의 위상을 각각 조정하는 RF 신호 처리부; 및 상기 수신된 비콘 신호를 분석하여 상기 배열 안테나 각각에 대응하는 다수 무선 채널 간의 위상차를 보상하도록 상기 RF 신호 처리부를 제어하는 디지털 신호 처리부를 포함하여 이루어질 수 있다.The plurality of wireless power transmitters are connected to an array antenna and the array antenna, respectively, and receive beacon signals transmitted from the one wireless power receiver through the array antenna, and transmit power signals of a predetermined frequency band to the array antenna. An RF signal processor for outputting the power signal to adjust a phase of a power signal output to the array antenna according to the control of the digital signal processor; And a digital signal processor that analyzes the received beacon signal and controls the RF signal processor to compensate for a phase difference between a plurality of wireless channels corresponding to each of the array antennas.
또한, 상기 다수의 무선 전력 송신기는 각각, 상호 간에 위상 동기 기준 정보를 송수신하는 통신 인터페이스부를 더 포함하고, 상기 디지털 신호 처리부는 상기 통신 인터페이스부를 통해 수신된 정보에 기반하여, 동일한 시점에 위상 조정이 이루어지도록 상기 RF 신호 처리부를 제어할 수 있다.The plurality of wireless power transmitters may further include a communication interface unit for transmitting and receiving phase synchronization reference information to each other, and the digital signal processing unit may perform phase adjustment at the same time based on the information received through the communication interface unit. The RF signal processing unit may be controlled to make it.
더하여, 본 발명은 상술한 과제를 해결하기 위한 다른 수단으로서, 서로 다른 위치에 분산 배치되어, 에너지 빔포밍 기반으로 RF 전력 신호를 송출하는 다수의 무선 전력 송신기를 이용한 협업 무선 전력 전송 방법에 있어서, 상기 다수의 무선 전력 송신기가, 무선 전력 수신기로부터 송출된 비콘 신호를 수신하여, 하나의 동일한 무선 전력 수신기의 위치를 확인하는 단계; 상기 확인된 하나의 무선 전력 수신기에 대한 무선 채널 간의 위상차 및 다른 무선 전력 송신기 간의 위상차를 산출하여, 상기 하나의 무선 전력 수신기에서 동일한 위상의 전력 신호가 수신되도록 상기 RF 전력 신호의 위상을 보정하는 단계; 및 위상 보정된 RF 전력 신호를 배열 안테나를 통해 상기 무선 전력 수신기로 송출하는 단계를 포함하는 것을 특징으로 하는 협업 무선 전력 전송 방법을 제공한다.In addition, the present invention provides a cooperative wireless power transmission method using a plurality of wireless power transmitter that is distributed to different locations, and transmits the RF power signal based on the energy beamforming as another means for solving the above problems, Receiving, by the plurality of wireless power transmitters, a beacon signal transmitted from a wireless power receiver to identify a location of one same wireless power receiver; Calculating a phase difference between wireless channels for the identified one wireless power receiver and a phase difference between other wireless power transmitters, and correcting a phase of the RF power signal so that a power signal having the same phase is received at the one wireless power receiver. ; And transmitting a phase-corrected RF power signal to the wireless power receiver through an array antenna.
본 발명에 따른 협업 무선 전력 전송 방법은, 상기 다수의 무선 전력 송신기의 개수(N), 상기 무선 전력 수신기로부터 수신된 비콘 신호의 전계 강도, 사람의 근접 여부 중 하나 이상을 고려하여 상기 RF 전력 신호의 송출 전력을 조정하는 단계를 더 포함할 수 있다.In the cooperative wireless power transmission method according to the present invention, the RF power signal in consideration of one or more of the number (N) of the plurality of wireless power transmitters, the electric field strength of the beacon signal received from the wireless power receiver, the proximity of people. Adjusting the output power of may further include.
또한, 본 발명에 따른 협업 무선 전력 전송 방법에 있어서, 상기 위상을 보정하는 단계는, 상기 다수의 무선 전력 송신기 중 하나를 마스터 무선 전력 송신기로 설정하고, 상기 하나의 마스터 무선 전력 송신기를 제외한 나머지 무선 전력 송신기가, 상기 마스터 무선 전력 송신기로부터 상기 위상 동기 기준 정보를 수신하고, 수신한 정보를 기준으로 상기 마스터 무선 전력 송신기 간의 위상차를 보정하도록 할 수 있다.In the collaborative wireless power transmission method according to the present invention, the correcting the phase may include setting one of the plurality of wireless power transmitters as a master wireless power transmitter and performing the rest of the wireless except for the one master wireless power transmitter. The power transmitter may receive the phase synchronization reference information from the master wireless power transmitter and correct the phase difference between the master wireless power transmitters based on the received information.
통상적인 에너지 빔포밍을 이용한 무선 전력 전송은, 하나의 송신단에 송출 전력이 집중되므로, 인체에 유해한 영향을 기칠 가능성이 상대적으로 높고, 또한 전송 경로 상에 장애물이 위치할 경우 무선 전력 전송 효율이 급격히 낮아지는 단점이 있었다.In the conventional wireless power transmission using energy beamforming, since transmission power is concentrated in one transmitter, the possibility of harmful effects on the human body is relatively high, and wireless power transmission efficiency is rapidly increased when obstacles are located on the transmission path. There was a downside.
그러나, 본 발명은 물리적으로 분산 배치되는 다수의 무선 전력 송신기 간의 협업을 통하여 하나의 무선 전력 수신기에 대하여 분산 빔포밍을 수행함으로써, 송출 전력을 공간상에서 분산시켜 무선 전력 송신기에서의 송출 전력을 감소시킬 수 있으며, 이를 통해 인체 안전성 규격을 만족시키면서, 무선 전력 수신기로의 전송 효율을 높일 수 있다.However, according to the present invention, distributed beamforming is performed on one wireless power receiver through collaboration between a plurality of physically distributed wireless power transmitters, thereby reducing transmission power in a wireless power transmitter by distributing transmission power in space. Through this, while satisfying the human safety standard, it is possible to increase the transmission efficiency to the wireless power receiver.
즉, 본 발명에 따른 협업 무선 전력 전송 시스템에 의하여 RF 전력 신호의 송출 시의 무선 전력 수신기의 수신 전력은, 단일의 무선 전력 송신기를 이용하여 전력을 전송할 때의 수신 전력 보다 커진다.That is, the reception power of the wireless power receiver at the time of transmitting the RF power signal by the cooperative wireless power transmission system according to the present invention is larger than the reception power at the time of transmitting power using a single wireless power transmitter.
도 1은 본 발명에 따른 협업 무선 전력 전송 시스템의 개략적인 구조를 나타낸 블럭도이다.1 is a block diagram showing a schematic structure of a cooperative wireless power transfer system according to the present invention.
도 2는 기존의 무선 전력 전송 방식과 본 발명에 따른 협업 무선 전력 전송 방식을 비교하여 설명하기 위한 모식도이다.2 is a schematic diagram illustrating a comparison between the conventional wireless power transmission method and the cooperative wireless power transmission method according to the present invention.
도 3은 본 발명에 따른 협업 무선 전력 전송 시스템에 있어서, 각 무선 전력 송신기의 구성을 나타낸 블럭도이다.3 is a block diagram showing the configuration of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
도 4는 본 발명에 따른 협업 무선 전력 전송 시스템에 있어서, 무선 전력 수신기의 구성을 나타낸 블럭도이다.4 is a block diagram showing the configuration of a wireless power receiver in the cooperative wireless power transmission system according to the present invention.
도 5는 본 발명에 따른 협업 무선 전력 전송 시스템의 일 예를 나타낸 모식도이다.5 is a schematic diagram showing an example of a cooperative wireless power transmission system according to the present invention.
도 6은 본 발명에 따른 협업 무선 전력 전송 시스템에서, 각 무선 전력 송신기의 출력 가중치 제어를 설명하는 모식도이다.6 is a schematic diagram illustrating output weight control of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
도 7은 본 발명에 따른 협업 무선 전력 전송 시스템에서, 각 무선 전력 송신기의 위상차 보상 개념을 설명하기 위한 도면이다.7 is a view for explaining a phase difference compensation concept of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
도 8은 본 발명에 따른 협업 무선 전력 전송 시스템에서, 각 무선 전력 송신기의 위상 보상을 위한 구성을 예시한 도면이다.8 is a diagram illustrating a configuration for phase compensation of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
도 9는 본 발명에 따른 협업 무선 전력 전송 시스템에서, 무선 전력 송신기 간의 위상 동기화를 설명하기 위한 도면이다.9 is a view for explaining phase synchronization between wireless power transmitters in the cooperative wireless power transmission system according to the present invention.
도 10은 본 발명에 따른 협업 무선 전력 전송 시스템에서, 무선 전력 송신기 간의 위상 동기화 방법을 나타낸 도면이다.10 is a diagram illustrating a phase synchronization method between wireless power transmitters in a cooperative wireless power transmission system according to the present invention.
이하 본 발명의 바람직한 실시 예를 첨부한 도면을 참조하여 상세히 설명한다. 다만, 하기의 설명 및 첨부된 도면에서 본 발명의 요지를 흐릴 수 있는 공지 기능 또는 구성에 대한 상세한 설명은 생략한다. 또한, 도면 전체에 걸쳐 동일한 구성 요소들은 가능한 한 동일한 도면 부호로 나타내고 있음에 유의하여야 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description and the accompanying drawings, detailed descriptions of well-known functions or configurations that may obscure the subject matter of the present invention will be omitted. In addition, it should be noted that like elements are denoted by like reference numerals as much as possible throughout the drawings.
이하에서 설명되는 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니 되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위한 용어의 개념으로 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. 따라서 본 명세서에 기재된 실시 예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일 실시 예에 불과할 뿐이고, 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형 예들이 있을 수 있음을 이해하여야 한다.The terms or words used in the specification and claims described below should not be construed as being limited to ordinary or dictionary meanings, and the inventors are appropriate as concepts of terms for explaining their own invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various alternatives may be substituted at the time of the present application. It should be understood that there may be equivalents and variations.
또한, 제1, 제2 등과 같이 서수를 포함하는 용어는 다양한 구성요소들을 설명하기 위해 사용하는 것으로, 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용될 뿐, 상기 구성요소들을 한정하기 위해 사용되지 않는다. 예를 들어, 본 발명의 권리 범위를 벗어나지 않으면서 제2 구성요소는 제1 구성요소로 명명될 수 있고, 유사하게 제1 구성요소도 제2 구성요소로 명명될 수 있다.In addition, terms including ordinal numbers, such as first and second, are used to describe various components, and are used only to distinguish one component from another component, and to limit the components. Not used. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
더하여, 어떤 구성요소가 다른 구성요소에 "연결되어" 있다거나 "접속되어" 있다고 언급할 경우, 이는 논리적 또는 물리적으로 연결되거나, 접속될 수 있음을 의미한다. 다시 말해, 구성요소가 다른 구성요소에 직접적으로 연결되거나 접속되어 있을 수 있지만, 중간에 다른 구성요소가 존재할 수도 있으며, 간접적으로 연결되거나 접속될 수도 있다고 이해되어야 할 것이다.In addition, when a component is referred to as being "connected" or "connected" to another component, it means that it may be connected or connected logically or physically. In other words, although a component may be directly connected or connected to other components, it should be understood that other components may exist in the middle, and may be connected or connected indirectly.
또한, 본 명세서에서 사용한 용어는 단지 특정한 실시 예를 설명하기 위해 사용된 것으로, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 또한, 본 명세서에서 기술되는 "포함한다" 또는 "가지다" 등의 용어는 명세서상에 기재된 특징, 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.In addition, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In addition, the terms "comprises" or "having" described herein are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or the same. It is to be understood that the present invention does not exclude in advance the possibility of the presence or the addition of other features, numbers, steps, operations, components, parts, or a combination thereof.
도 1은 본 발명에 따른 협업 무선 전력 전송 시스템의 개략적인 구조를 나타낸 블럭도로서, 이를 참조하면, 본 발명에 따른 협업 무선 전력 전송 시스템은, 다수의 무선 전력 송신기(100)와, 하나의 무선 전력 수신기(200)를 포함한다.1 is a block diagram illustrating a schematic structure of a cooperative wireless power transmission system according to the present invention. Referring to this, the cooperative wireless power transmission system according to the present invention includes a plurality of wireless power transmitters 100 and a single radio. And a power receiver 200.
본 발명에 있어서, 상기 다수의 무선 전력 송신기(100)는 서로 다른 위치에 분산 배치되어, 하나의 무선 전력 수신기(200)를 향해 에너지 빔포밍 기반의 전력 신호를 송출한다. 또한, 상기 다수의 무선 전력 송신기(100)는, 상호 간에 위상 동기 보정 및 무선 채널 간의 위상차를 보정하여, 상기 하나의 무선 전력 수신기에서 동일한 위상의 전력 신호가 수신되도록 제어한다.In the present invention, the plurality of wireless power transmitters 100 are distributed in different locations and transmit energy beamforming-based power signals toward one wireless power receiver 200. In addition, the plurality of wireless power transmitters 100 compensate for phase synchronization between each other and a phase difference between wireless channels, and control the power signals of the same phase to be received by the one wireless power receiver.
이러한 본 발명의 협업 무선 전력 전송 시스템은, 하나의 무선 전력 수신기(200)에서 제공할 전력을, 복수의 무선 전력 송신기(100)를 통한 협업 및 분산 빔포밍을 통해서 전송하는 것이다.The cooperative wireless power transmission system of the present invention transmits power to be provided by one wireless power receiver 200 through cooperative and distributed beamforming through a plurality of wireless power transmitters 100.
참고로, 최대 출력 Pt의 전력을 전력 수신기로 전송하고자 할 때, 기존 방식에서는 도 2의 (a)에 도시된 바와 같이, 단일의 전력 송신기를 통해서 최대 출력 Pt의 전력을 모두 전송하여야 하며, 그 결과, 상기 전력 송신기와 전력 수신기 사이에 사용자가 위치할 경우, 사용자의 전자파 노출 위험도가 증가하며 사용자의 인체를 거치면서 전력 신호의 에너지가 급감하여 수신단에서 수신되는 총 수신전력이 낮아지는 문제가 있었다.For reference, when the power of the maximum output Pt is to be transmitted to the power receiver, in the conventional scheme, as shown in FIG. 2 (a), all the power of the maximum output Pt must be transmitted through a single power transmitter. As a result, when the user is located between the power transmitter and the power receiver, there is a problem that the risk of electromagnetic wave exposure of the user increases, and as the energy of the power signal decreases rapidly through the user's human body, the total received power received at the receiving end is lowered. .
반면에, 본 발명에 따른 협업 무선 전력 전송 시스템은, 상기 요구되는 최대 출력 Pt를 다수의 무선 전력 송신기(100)가 나누어 전송하게 된다. 예를 들어, 도 2의 (b)와 같이, 4개의 무선 전력 송신기를 통해서 분산 빔포밍할 경우, 각 무선 전력 송신기는 Pt/4의 전력신호를 송출하면 되므로, 각 무선 전력 송신기(100)에서 송출할 전력 신호의 최대 출력을 낮출 수 있으며, 그 결과, 사용자의 전자파 노출 위험도를 감소시킬 수 있다.On the other hand, in the cooperative wireless power transmission system according to the present invention, the plurality of wireless power transmitters 100 transmit the required maximum output Pt. For example, as shown in (b) of FIG. 2, when distributed beamforming through four wireless power transmitters, each wireless power transmitter may transmit a power signal of Pt / 4, and thus, in each wireless power transmitter 100. The maximum output of the power signal to be transmitted can be lowered, and as a result, the risk of exposure to the user's electromagnetic waves can be reduced.
아울러, 사용자가 분산된 전력 신호의 어느 한 경로 상에 위치하여 전력 신호가 감소되더라도 나머지 무선 전력 송신기에서 송출된 전력 신호는 모두 무선 전력 수신기(200)에 수신될 수 있으므로, 에너지 전송 효율을 높일 수 있게 된다.In addition, even if the user is located on one path of the distributed power signal and the power signal is reduced, all the power signals transmitted from the remaining wireless power transmitters may be received by the wireless power receiver 200, thereby improving energy transmission efficiency. Will be.
이때, 무선 전력 수신기(200)에서의 수신 전력을 높이기 위해서, 상기 다수의 무선 전력 송신기(100)는, 송신단과 수신단 사이의 무선 채널 간 위상 오프셋을 보상할 수 있어야 하며, 아울러, 다른 무선 전력 송신기(100)와의 위상 차를 보상할 수 있도록 위상 동기를 수행할 수 있어야 한다.In this case, in order to increase the reception power in the wireless power receiver 200, the plurality of wireless power transmitters 100 should be able to compensate phase offsets between wireless channels between the transmitting end and the receiving end, and in addition, other wireless power transmitters. It should be possible to perform phase synchronization to compensate for the phase difference with (100).
아울러, 상기 다수의 무선 전력 송신기(100)는 물리적으로 서로 일정 거리 이상 이격되어 배치됨으로써, 에너지가 특정 지역에서 높아지는 것을 방지한다.In addition, the plurality of wireless power transmitters 100 are physically spaced apart from each other by a predetermined distance, thereby preventing the energy from rising in a specific region.
도 3은 본 발명에 따른 협업 무선 전력 전송 시스템에 있어서, 각 무선 전력 송신기(100)의 구성을 나타낸 블럭도이다.3 is a block diagram showing the configuration of each wireless power transmitter 100 in the cooperative wireless power transmission system according to the present invention.
도 3을 참조하면, 본 발명에 따른 협업 무선 전력 전송 시스템을 구축하기 위한 무선 전력 송신기(100)는, 배열 안테나(110)와, RF(Radio Frequency) 신호 처리부(120)와, 디지털 신호 처리부(130)와, 통신 인터페이스부(140)를 포함한다.Referring to FIG. 3, the wireless power transmitter 100 for building a cooperative wireless power transmission system according to the present invention includes an array antenna 110, an RF (Radio Frequency) signal processing unit 120, and a digital signal processing unit ( 130, and a communication interface 140.
상기 배열 안테나(110)는, 다수의 안테나 소자가 일정 간격으로 배열되어 이루어진 것으로서, 각 안테나 소자를 통해서 서로 다른 경로로 무선 신호를 송출할 수 있다.The array antenna 110 is formed of a plurality of antenna elements arranged at regular intervals, and may transmit a radio signal through different paths through each antenna element.
상기 RF 신호 처리부(120)는, 상기 배열 안테나(110)에 연결되어, 상기 배열 안테나(110)를 통해 상기 하나의 무선 전력 수신기(200)로부터 송출된 비콘 신호를 수신하고, 상기 배열 안테나로 소정 주파수 대역의 전력 신호를 출력하되, 디지털 신호 처리부(130)의 제어에 따라서 상기 배열 안테나로 출력되는 전력 신호의 위상을 각각 조정한다. The RF signal processing unit 120 is connected to the array antenna 110, receives the beacon signal transmitted from the one wireless power receiver 200 through the array antenna 110, and predetermined as the array antenna. Outputs a power signal of the frequency band, and adjusts the phase of the power signal output to the array antenna according to the control of the digital signal processor 130.
상기 디지털 신호 처리부(130)는, 상기 RF 신호 처리부(120)에 연결되어, 베이스밴드 신호의 처리 및 제어를 수행하기 위한 구성으로서, 하나 이상의 마이크로프로세서 혹은 프로세싱 모듈을 포함할 수 있다. 이러한 디지털 신호 처리부(130)는, 상기 수신된 비콘 신호를 분석하여 상기 배열 안테나 각각에 대응하는 다수 무선 채널 간의 위상차를 보상하도록 상기 RF 신호 처리부를 제어한다.The digital signal processor 130 is connected to the RF signal processor 120 and is a component for processing and controlling a baseband signal and may include one or more microprocessors or processing modules. The digital signal processor 130 controls the RF signal processor to analyze the received beacon signal and compensate for a phase difference between a plurality of wireless channels corresponding to each of the array antennas.
마지막으로 통신 인터페이스부(140)는, 다른 무선 전력 송신기(100)와의 위상 동기를 위하여 위상 동기 기준 정보를 송수신하기 위한 구성이다. 여기서, 통신 인터페이스부(140)는 유선 또는 무선으로 다른 무선 전력 송신기(100) 간을 연결하여 신호(정보)를 송수신할 수 있다.Finally, the communication interface 140 is a component for transmitting and receiving phase synchronization reference information for phase synchronization with another wireless power transmitter 100. Here, the communication interface 140 may transmit or receive a signal (information) by connecting between other wireless power transmitters 100 by wire or wirelessly.
상기 디지털 신호 처리부(130)는 상기 통신 인터페이스부(140)를 통해 수신된 위상 동기 기준 정보에 기반하여, 동일한 시점에 위상 조정이 이루어지도록 상기 RF 신호 처리부(120)를 제어할 수 있다.The digital signal processor 130 may control the RF signal processor 120 to perform phase adjustment at the same time based on the phase synchronization reference information received through the communication interface 140.
여기서, 무선 전력 송신기(100) 간에 공유되는 위상 동기 기준 정보는, 무선 전력 송신기(100)와 무선 전력 수신기(200) 간의 위상 오프셋 정보일 수 있다.Here, the phase synchronization reference information shared between the wireless power transmitters 100 may be phase offset information between the wireless power transmitters 100 and the wireless power receiver 200.
다음으로, 도 4는 본 발명에 따른 협업 무선 전력 전송 시스템에 있어서, 무선 전력 수신기(200)의 구성을 나타낸 블럭도이다.Next, FIG. 4 is a block diagram showing the configuration of the wireless power receiver 200 in the cooperative wireless power transmission system according to the present invention.
도 4를 참조하면, 무선 전력 수신기(200)는, 안테나부(210)와, 전력 수신부(220)를 포함하여, 상기 다수의 무선 전력 송신기(100)로부터 송출된 RF 전력 신호를 상기 안테나부(210)를 통해 수신한 후, 상기 수신한 RF 전력 신호를 전력 수신부(220)를 통해서 DC 전류로 변환하여 출력한다. 상기 전력 수신부(220)는 임피던스 매칭 회로, 증폭회로, 캐패시터 등을 포함하여 이루어질 수 있다.Referring to FIG. 4, the wireless power receiver 200 includes an antenna unit 210 and a power receiver 220 to receive RF power signals transmitted from the plurality of wireless power transmitters 100. After receiving through 210, the received RF power signal is converted into DC current through the power receiver 220 and output. The power receiver 220 may include an impedance matching circuit, an amplifier circuit, a capacitor, and the like.
더하여, 상기 무선 전력 수신기(200)는, 비콘 신호 송신부(230)를 더 포함하여, 상기 다수의 무선 전력 송신기(100)가 각각 자신의 위치를 확인하고, 경로 상의 위상차를 검출할 수 있도록 비콘 신호를 주기적으로 송출한다. 참고로, 상기 비콘 신호는 Training Sequence 혹은 Pilot 신호라고 불리기도 한다. In addition, the wireless power receiver 200 further includes a beacon signal transmitter 230 so that the plurality of wireless power transmitters 100 can identify their positions and detect a phase difference on a path. Send out periodically. For reference, the beacon signal is also called a training sequence or pilot signal.
상기 무선 전력 수신기(200)는, 상기 비콘 신호를 주기적으로 혹은 수신 에너지가 특정 레벨보다 감소한 경우 비주기적으로 전송할 수 있다. 여기서, 비콘 신호가 전송되는 주기 및 비주기적으로 보내는 경우를 결정하는 특정 레벨은 상기 무선 전력 수신기(200)에 의해 결정된다.The wireless power receiver 200 may transmit the beacon signal periodically or aperiodically when the reception energy is lower than a specific level. Here, the specific level that determines the period in which the beacon signal is transmitted and the case in which it is sent aperiodically is determined by the wireless power receiver 200.
상술한 바와 같이 구성된 다수의 무선 전력 송신기(100)를 통해서 하나의 무선 전력 수신기(200)로 RF 전력 신호를 송신하기 위한 동작을 도 5 내지 도 10의 도면을 참조하여 설명한다.An operation for transmitting an RF power signal to one wireless power receiver 200 through the plurality of wireless power transmitters 100 configured as described above will be described with reference to FIGS. 5 to 10.
도 5는 본 발명에 따른 협업 무선 전력 전송 시스템의 일 예를 나타낸 모식도이다. 도 5의 예시에서, 본 발명에 따른 협업 무선 전력 전송 시스템은, 4개의 무선 전력 송신기(100a, 100b, 100c, 100d)를 통해 전력 신호에 대한 분산 빔포밍을 수행한다. 여기서, 협업 무선 전력 전송에 이용되는 무선 전력 송신기(100)의 수는 예시에 불과하며, 적용되는 개소의 환경에 따라서 달라질 수 있다.5 is a schematic diagram showing an example of a cooperative wireless power transmission system according to the present invention. In the example of FIG. 5, the cooperative wireless power transmission system according to the present invention performs distributed beamforming on a power signal through four wireless power transmitters 100a, 100b, 100c and 100d. Here, the number of the wireless power transmitter 100 used for the cooperative wireless power transmission is only an example, and may vary depending on the environment of the applied location.
상술한 바와 같이 구성된 협업 무선 전력 전송 시스템에서, 4개의 무선 전력 송신기(100a, 100b, 100c, 100d)는, 무선 전력 전송을 수행하기 전, 무선 전력을 전송할 무선 전력 수신기(200)의 위치를 계산하기 위하여, 상기 무선 전력 수신기(200)로부터 송출된 비콘 신호를 수신하고, 수신된 비콘 신호를 해석하여 무선 전력 수신기(200)의 수신 위치를 파악한다. 도 5의 예시에서는, 무선 전력 수신기(200a)를 전력 전송 대상으로 설정한 것으로 가정한다.In the cooperative wireless power transmission system configured as described above, the four wireless power transmitters 100a, 100b, 100c, and 100d calculate the position of the wireless power receiver 200 to transmit wireless power before performing the wireless power transmission. In order to receive the beacon signal transmitted from the wireless power receiver 200, and analyzes the received beacon signal to determine the reception position of the wireless power receiver 200. In the example of FIG. 5, it is assumed that the wireless power receiver 200a is set as a power transmission target.
이때, 상기 4개의 무선 전력 송신기(100a, 100b, 100c, 100d)는 상기 무선 전력 수신기(200a)의 빠른 충전을 위해 요구되는 최대 출력(Pt)를 나누어 전송한다. 예를 들어, 이상적으로 설계된 최대 출력이 Pt인 경우, 다수의 무선 전력 송신기(100)의 초기 출력은 Pt/N(여기서, N은 협업을 수행하는 무선 전력 송신기의 수이다)으로 설정될 수 있으며, 해당 무선 전력 수신기(200)의 이동, 각 무선 전력 송신기(100)와 무선 전력 수신기(200) 사이의 거리(즉, 송신단과 수신단의 거리), 무선 경로 상에 사람 혹은 물체가 위치하는 등의 환경에 따라서 조정될 수 있다.In this case, the four wireless power transmitters 100a, 100b, 100c, and 100d divide and transmit the maximum output Pt required for fast charging of the wireless power receiver 200a. For example, if the ideally designed maximum output is Pt, the initial output of the multiple wireless power transmitters 100 may be set to Pt / N (where N is the number of wireless power transmitters performing the collaboration) and , The movement of the wireless power receiver 200, the distance between each wireless power transmitter 100 and the wireless power receiver 200 (that is, the distance between the transmitting end and the receiving end), a person or an object on a wireless path, or the like. It can be adjusted according to the environment.
따라서, 상기 4개의 무선 전력 송신기(100a, 100b, 100c, 100d)는, 전력 전송 중에, 송신 출력의 세기(Power)를 스케일러블(Scalable)할 수 있도록 구성한다. Therefore, the four wireless power transmitters 100a, 100b, 100c, and 100d are configured to be able to scale the power of the transmission output during power transmission.
예를 들어, 도 5의 4개의 무선 전력 송신기(100a, 100b, 100c, 100d) 중 한 무선 전력 송신기(100a) 근방에 사람이나 물체 등의 객체가 존재한다고 가정할 때, 무선 전력 송신기(200a)가 수신한 비콘 신호의 강도는 다른 무선 전력 송신기(100b, 100c 100d)에서 수신한 비콘 신호의 강도보다 상대적으로 작다. For example, assuming that an object such as a person or an object exists near one of the four wireless power transmitters 100a, 100b, 100c, and 100d of FIG. 5, the wireless power transmitter 200a may be used. The strength of the received beacon signal is relatively smaller than the strength of the beacon signal received by the other wireless power transmitters 100b and 100c.
따라서, 본 발명에 따른 다수의 무선 전력 송신기(100a, 100b, 100c, 100d)는 대상 무선 전력 수신기(200a)의 비콘 신호를 수신하여 위치를 파악할 때, 수신한 비콘 신호의 강도를 확인하고, 그에 따라서 송출 전력의 크기를 조절한다.Therefore, when the plurality of wireless power transmitters 100a, 100b, 100c, and 100d according to the present invention receive a beacon signal of the target wireless power receiver 200a and determine a location, the plurality of wireless power transmitters 100a, 100b, 100c, and 100d check the strength of the received beacon signal. Therefore, the magnitude of the output power is adjusted.
구체적으로, 다수의 무선 전력 송신기(100a, 100b, 100c, 100d)는, 송출 전력을 ωPt(여기서, ω는 출력 가중치이고, Pt는 무선 전력 송신기의 최대 출력이다.)로 설정하고, 비콘 신호의 강도 및 협업하는 무선 전력 송신기(100a, 100b, 100c, 100d)의 수(N)에 따라서, 상기 출력 가중치를 변경함으로써, 송출 전력을 스케일러블하게 조절할 수 있다. 이때, 0<ω≤1이다. Specifically, the plurality of wireless power transmitters 100a, 100b, 100c, and 100d set the transmission power to ωP t (where ω is the output weight and Pt is the maximum output of the wireless power transmitter), and the beacon signal By varying the output weight according to the strength and the number (N) of wireless power transmitters 100a, 100b, 100c, 100d collaborating, the output power can be scaled. At this time, 0 <ω≤1.
이를 위하여, 상기 다수의 무선 전력 송신기(100a, 100b, 100c, 100d)는 통신 인터페이스부(140)를 통해서 상호 통신하여, 협업하는 무선 전력 송신기(100)의 수(N) 및 다른 무선 전력 송신기(100)에서의 비콘 신호 강도를 확인할 수 있다.To this end, the plurality of wireless power transmitters 100a, 100b, 100c, and 100d communicate with each other through the communication interface unit 140 to cooperate with each other (N) of wireless power transmitters 100 and other wireless power transmitters ( Beacon signal strength at 100) can be confirmed.
도 6은 도 5에 도시된 협업 무선 전력 전송 시스템에서, 각 무선 전력 송신기의 출력 가중치 제어를 설명하는 모식도이다. 여기서, 4개의 무선 전력 송신기(100a, 100b, 100c, 100d)의 출력 가중치를 각각 ω1, ω2, ω3, ω4라 하고, 이때, 각각의 송출 전력은 ω1Pt, ω2Pt, ω3Pt, ω4Pt가 된다.FIG. 6 is a schematic diagram illustrating output weight control of each wireless power transmitter in the cooperative wireless power transmission system illustrated in FIG. 5. Here, the output weights of the four wireless power transmitters 100a, 100b, 100c, and 100d are ω 1 , ω 2 , ω 3 , and ω 4 , respectively, and each transmission power is ω 1 P t , ω 2 P t , ω 3 P t , ω 4 P t .
따라서, 상술한 예와 같이, 무선 전력 송신기(100a) 근방에 사람이나 물체 등의 객체가 존재한다고 가정할 때, 무선 전력 송신기(100a)는 출력 가중치(ω1)를 조절하여 송신 출력을 감소한 후, 이를 다른 무선 전력 송신기(100b, 100c, 100d)로 전송함으로써, 상기 나머지 무선 전력 송신기(100b, 100c, 100d)에서 출력 가중치는 증가시켜, 송출 전력을 그 만큼 높일 수 있도록 할 수 있다.Therefore, as in the above example, assuming that an object such as a person or an object exists near the wireless power transmitter 100a, the wireless power transmitter 100a reduces the transmission output by adjusting the output weight ω 1 . By transmitting the same to the other wireless power transmitters 100b, 100c, and 100d, the output weight may be increased in the remaining wireless power transmitters 100b, 100c, and 100d, thereby increasing the output power.
이러한 처리는 상기 무선 전력 수신기(200a)의 이동에 따른 송신단과 수신단의 거리 변화에 대하여도 동일하게 적용될 수 있다. 이때, 거리가 멀어질 수록 비콘 신호의 수신 강도가 감소되므로, 그 만큼 출력 가중치를 증가시켜 송출 전력을 높일 수 있다. This process may be equally applied to the change of the distance between the transmitter and the receiver according to the movement of the wireless power receiver 200a. At this time, the receiving distance of the beacon signal decreases as the distance increases, so that output power can be increased by increasing the output weight.
또한, 사람이 특정 무선 전력 송신기(100)에 근접할 경우, 인체 유해성 방지를 위하여, 해당 무선 전력 송신기(100)의 송출 전력을 감소시키도록 제어할 수 있다. 이를 위하여 상기 다수의 무선 전력 송신기(100)는 사람의 근접을 감지할 수 있는 수단(근접 센서 등)을 더 포함할 수 있다.In addition, when a person is close to the specific wireless power transmitter 100, in order to prevent human harm, it may be controlled to reduce the transmission power of the wireless power transmitter 100. To this end, the plurality of wireless power transmitters 100 may further include a means (proximity sensor, etc.) for detecting the proximity of a person.
따라서, 도 6의 예시에서 전송 중의 손실을 고려하지 않을 때, 무선 전력 수신기(200a)에서의 수신 전력은, ω1Pt+ω2Pt+ω3Pt+ω4Pt가 된다. 이때, 0 < ω1+ω2+ω3+ ω4≤ 1이며, 가장 바람직하게는 1이 되도록 각각의 출력 가중치를 조정할 수 있다.Therefore, when not considering the loss during transmission in the example of FIG. 6, the received power at the wireless power receiver 200a becomes ω 1 P t + ω 2 P t + ω 3 P t + ω 4 P t . At this time, each output weight may be adjusted such that 0 <ω 1 + ω 2 + ω 3 + ω 4 ≤ 1, most preferably 1.
더하여, 상기 다수의 무선 전력 송신기(100a, 100b, 100c, 100d)는 무신 전력 수신기(200a)와의 무선 채널간 위상 오프셋 보정을 위해, 무선 전력 수신기(200a)로부터 수신한 비콘 신호로부터 무선 채널 간 위상차를 계산하고, 계산된 위상차를 보상하도록 배열 안테나(110)의 다수 안테나 소자별로 전력 신호의 위상을 조정할 수 있다.In addition, the plurality of wireless power transmitters 100a, 100b, 100c, and 100d may perform phase difference between wireless channels from a beacon signal received from the wireless power receiver 200a to correct phase offset between wireless channels with the radio power receiver 200a. And calculate the phase of the power signal for each of the plurality of antenna elements of the array antenna 110 to compensate the calculated phase difference.
도 7은 본 발명에 따른 협업 무선 전력 전송 시스템에서, 무선 전력 송신기(100)의 무선 채널 간 위상차 보상 개념을 설명하기 위한 도면이다.FIG. 7 is a diagram for describing a concept of compensation for phase difference between wireless channels of the wireless power transmitter 100 in the cooperative wireless power transmission system according to the present invention.
도 7에 도시된 바와 같이, 무선 전력 송신기(100)의 배열 안테나(110)를 통해서 여러 경로로 RF 전력 신호가 전송되는 경우, 무선 전력 수신기(200)에서 수신된 여러 RF 전력 신호의 위상이 일치할 경우, 그 합이 가장 커진다. 따라서, 무선 전력 수신기(200)에서의 수신 전력을 높이기 위해서는, 다중 경로로 전송되는 RF 전력 신호가 수신단에 도달하는 전송 지연(Δ1, Δ2, Δ3, Δ4)을 추정하여, 그 전송 지연(Δ1, Δ2, Δ3, Δ4)만큼 송출할 전력의 위상을 보정 후 송출하여야 한다.As shown in FIG. 7, when RF power signals are transmitted in various paths through the array antenna 110 of the wireless power transmitter 100, the phases of the various RF power signals received by the wireless power receiver 200 coincide with each other. If you do, the sum is the largest. Therefore, in order to increase the received power in the wireless power receiver 200, the transmission delay Δ 1 , Δ 2 , Δ 3 , Δ 4 , at which the RF power signal transmitted in the multipath arrives at the receiver, is estimated and transmitted. The phases of the power to be transmitted by the delays Δ 1 , Δ 2 , Δ 3 , and Δ 4 should be transmitted after correction.
이를 위하여, 무선 전력 송신기(100)는, 수신된 비콘 신호를 해석하여, 무선 전력 수신기(200)까지의 전송 지연값을 추정하고, 이를 기반으로 각 무선 채널의 전력 신호에 대하여 미리 위상 보상(pre-phase compensation)을 실시하여 전송한다.To this end, the wireless power transmitter 100 analyzes the received beacon signal, estimates a transmission delay value to the wireless power receiver 200, and based on this, precompensates for the power signal of each wireless channel in advance. -phase compensation) to transmit.
또한, 이를 위해, 무선 전력 송신기(100)는 도 8과 같이 구성될 수 있다.In addition, for this purpose, the wireless power transmitter 100 may be configured as shown in FIG.
도 8은 본 발명에 따른 협업 무선 전력 전송 시스템에서, 각 무선 전력 송신기의 위상 보상을 위한 구성을 예시한 도면이다.8 is a diagram illustrating a configuration for phase compensation of each wireless power transmitter in the cooperative wireless power transmission system according to the present invention.
즉, 무선 전력 송신기(100)의 RF 신호 처리부(120)는, 도 8에 도시된 바와 같이, 전력 분배기(Power Splitter), 위상 쉬프터(Phase shifter), 및 증폭기(amplifier)를 구비하고, 디지털 신호 처리부(130)를 통해 상기 전력 분배기를 제어하여, 배열 안테나(110)의 각 안테나 소자로 출력되는 전력 신호(V1, V2, V3, V4)의 위상을 각각 조정할 수 있다.That is, as illustrated in FIG. 8, the RF signal processor 120 of the wireless power transmitter 100 includes a power splitter, a phase shifter, and an amplifier, and a digital signal. By controlling the power divider through the processor 130, the phases of the power signals V 1 , V 2 , V 3 , and V 4 output to each antenna element of the array antenna 110 may be adjusted.
아울러, 본 발명에 따른 협업 무선 전력 전송 시스템은, 배열 안테나를 이용한 에너지 빔포밍을 통해 다수 경로 RF 전력 신호를 송출하는 무선 전력 송신기(100)를 복수개 분산 배치하여, 다수의 무선 전력 송신기(100)를 통해 분산 빔포밍을 수행하는 것이다.In addition, the cooperative wireless power transmission system according to the present invention, by distributing a plurality of wireless power transmitter 100 for transmitting a multi-path RF power signal through energy beamforming using an array antenna, a plurality of wireless power transmitter 100 Through distributed beamforming is performed.
따라서, 다수의 무선 전력 송신기(100)에서 각각 송출되는 RF 전력 신호의 위상이, 도 9에 도시된 바와 같이, 달라질 수 있다.Therefore, the phase of the RF power signal transmitted from each of the plurality of wireless power transmitters 100 may vary, as shown in FIG. 9.
도 9에서, 우측 하단에 도시된 수신 전력의 파형 중, 점선은 무선 전력 송신기(100a)로부터 수신된 RF 전력 신호의 파형을 나타내고, 실선은 무선 전력 송신기(100b)로부터 수신된 RF 전력 신호의 파형을 나타낸다. In FIG. 9, among the waveforms of the received power shown at the lower right, the dotted line represents the waveform of the RF power signal received from the wireless power transmitter 100a, and the solid line represents the waveform of the RF power signal received from the wireless power transmitter 100b. Indicates.
즉, 본 발명에 따른 협업 무선 전력 전송 시스템의 경우, 각 무선 전력 송신기(100)에서 각각 무선 채널간의 위상차를 보상하더라도, 다수의 무선 전력 송신기(100)의 물리적 위치 및 전파 환경 차이로 인하여, 무선 전력 송신기(100) 간에도 위상차가 발생한다.That is, in the case of the cooperative wireless power transmission system according to the present invention, even if each wireless power transmitter 100 compensates for the phase difference between the wireless channels, due to differences in the physical location and the propagation environment of the plurality of wireless power transmitters 100 A phase difference also occurs between the power transmitters 100.
이를 위해, 본 발명에 따른 다수의 무선 전력 송신기(100)는, 상호 시간 동기화를 수행하여야 한다. 즉, 각 무선 전력 송신기(100)가 비콘 신호를 해석하여 산출한 위상차는 해당 무선 전력 송신기(100)의 무선 채널에 따른 위상차만이 반영된 값이며, 무선 전력 송신기(100) 간의 위상 동기화는 각 무선 전력 송신기(100)가 송신하는 전력이 무선 전력 수신기(200)에서 수신될 때, 같은 위상을 갖도록 하기 위해서 이루어진다. 본 발명에 따른 협업 무선 전력 전송 시스템에서 효율적인 분산 빔포밍을 위해서는, 다수의 무선 전력 송신기(100) 간 동기가 매우 중요하다.To this end, the plurality of wireless power transmitters 100 according to the present invention should perform mutual time synchronization. That is, the phase difference calculated by analyzing the beacon signal of each wireless power transmitter 100 is a value reflecting only the phase difference according to the wireless channel of the corresponding wireless power transmitter 100, and the phase synchronization between the wireless power transmitters 100 is wireless. When the power transmitted by the power transmitter 100 is received at the wireless power receiver 200, it is made to have the same phase. Synchronization between a plurality of wireless power transmitters 100 is very important for efficient distributed beamforming in the cooperative wireless power transmission system according to the present invention.
도 10은 본 발명에 따른 협업 무선 전력 전송 시스템에서, 다수의 무선 전력 송신기(100)간의 위상 동기화를 위한 방법을 나타낸 도면이다.10 is a diagram illustrating a method for phase synchronization between a plurality of wireless power transmitters 100 in a cooperative wireless power transmission system according to the present invention.
도 10에 도시된 바와 같이, 본 발명에 따른 협업 무선 전력 전송 시스템은, 다수의 무선 전력 송신기(100) 간의 위상 동기화를 위하여, 다수의 무선 전력 송신깅(100) 중 임의의 특정 노드가 마스터 노드(이하, 마스터 무선 전력 송신기라고 함)로 동작한다. 도 10의 예시에서는, 무선 전력 송신기(100a)가 마스터 무선 전력 송신기인 것으로 가정한다.As shown in FIG. 10, in the cooperative wireless power transmission system according to the present invention, any particular node of the plurality of wireless power transmissions 100 may be a master node for phase synchronization between the plurality of wireless power transmitters 100. (Hereinafter referred to as a master wireless power transmitter). In the example of FIG. 10, it is assumed that the wireless power transmitter 100a is a master wireless power transmitter.
상기 마스터 무선 전력 송신기(100a)는, 무선 전력 송신기(100) 간의 위상 동기화를 관리하기 위한 노드로서, 자신의 위상 오프셋을 위상 동기 기준 정보로서, 다른 무선 전력 송신기(100b, 100c, 100d)에 전달한다.The master wireless power transmitter 100a is a node for managing phase synchronization between the wireless power transmitters 100, and transmits its phase offset as phase synchronization reference information to other wireless power transmitters 100b, 100c, and 100d. do.
이를 위하여, 상기 다수의 무선 전력 송신기(100)는 통신 인터페이스부(140)를 통해서 상호 유선 또는 무선으로 연결된다. To this end, the plurality of wireless power transmitters 100 are wired or wirelessly connected to each other through the communication interface 140.
그리고, 상기 다른 무선 전력 송신기(100b, 100c, 100d)는 수신된 위상 동기 기준 정보와 비교하여, 상기 마스터 무선 전력 송신기(100a)와의 위상 차를 산출한다. 그리고, 상기 위상 동기 기준 정보를 기준으로, 무선 전력 수신기(200)에서 zero phase가 되도록 자신이 송출한 RF 전력 신호의 위상을 조정한다.The other wireless power transmitters 100b, 100c, and 100d calculate a phase difference with the master wireless power transmitter 100a by comparing the received phase synchronization reference information. And, based on the phase synchronization reference information, the wireless power receiver 200 adjusts the phase of the RF power signal transmitted by itself so that the zero phase.
상기 마스터 무선 전력 송신기(100a)의 변경이 가능하며, 마스터 무선 전력 송신기가 변경될 경우, 새로운 마스터 노드를 기준으로 위상 동기화 과정이 다시 이루어져야 한다. The master wireless power transmitter 100a may be changed, and when the master wireless power transmitter is changed, the phase synchronization process should be repeated based on the new master node.
본 발명은 에너지 빔포밍 기반의 무선 전력 전송 시스템에 적용되는 것으로서, 물리적으로 분산 배치되는 다수의 무선 전력 송신기 간의 협업을 통하여 하나의 무선 전력 수신기에 대하여 분산 빔포밍을 수행함으로써, 송출 전력을 공간상에서 분산시켜 무선 전력 송신기에서의 송출 전력을 감소시킬 수 있으며, 이를 통해 인체 안전성 규격을 만족시키면서, 무선 전력 수신기로의 전송 효율을 높일 수 있다.The present invention is applied to an energy beamforming-based wireless power transmission system, by performing distributed beamforming on one wireless power receiver through collaboration between a plurality of physically distributed wireless power transmitters, thereby transmitting power in space. It is possible to reduce the transmission power from the wireless power transmitter by dispersing, thereby increasing the transmission efficiency to the wireless power receiver while satisfying human safety standards.
즉, 본 발명에 따른 협업 무선 전력 전송 시스템에 의하여 RF 전력 신호의 송출 시의 무선 전력 수신기의 수신 전력은, 단일의 무선 전력 송신기를 이용하여 전력을 전송할 때의 수신 전력 보다 커진다.That is, the reception power of the wireless power receiver at the time of transmitting the RF power signal by the cooperative wireless power transmission system according to the present invention is larger than the reception power at the time of transmitting power using a single wireless power transmitter.

Claims (9)

  1. 서로 다른 위치에 분산 배치되어, 에너지 빔포밍 기반으로 RF 전력 신호를 송출하는 다수의 무선 전력 송신기를 포함하며,Distributed in different locations, including a plurality of wireless power transmitter for transmitting an RF power signal based on the energy beamforming,
    상기 다수의 무선 전력 송신기는, 무선 전력 수신기로부터 송출된 비콘 신호를 수신하여, 하나의 동일한 무선 전력 수신기의 위치를 확인하고, 상기 확인된 하나의 무선 전력 수신기에 대한 무선 채널 간의 위상차 및 다른 무선 전력 송신기 간의 위상차를 산출하여, 상기 하나의 무선 전력 수신기에서 동일한 위상의 전력 신호가 수신되도록 상기 RF 전력 신호의 위상을 보정하는 것을 특징으로 하는 협업 무선 전력 전송 시스템.The plurality of wireless power transmitters receive a beacon signal transmitted from a wireless power receiver to identify the location of one and the same wireless power receiver, and the phase difference between the wireless channels for the identified one wireless power receiver and the other wireless power. Calculating a phase difference between transmitters and correcting a phase of the RF power signal such that a power signal having the same phase is received by the one wireless power receiver.
  2. 제1항에 있어서, 상기 다수의 무선 전력 송신기는 각각,The wireless power transmitter of claim 1, wherein each of the plurality of wireless power transmitters comprises:
    상기 다수의 무선 전력 송신기의 개수(N), 상기 무선 전력 수신기로부터 수신된 비콘 신호의 전계 강도, 사람의 근접 여부 중 하나 이상을 고려하여 상기 RF 전력 신호의 송출 전력을 조정하는 것을 특징으로 하는 협업 무선 전력 전송 시스템.And adjusting the transmission power of the RF power signal in consideration of one or more of the number (N) of the plurality of wireless power transmitters, the electric field strength of the beacon signal received from the wireless power receiver, and the proximity of a person. Wireless power transfer system.
  3. 제1항에 있어서, 상기 다수의 무선 전력 송신기는The method of claim 1, wherein the plurality of wireless power transmitters
    하나의 마스터 무선 전력 송신기를 포함하고, One master wireless power transmitter,
    상기 하나의 마스터 무선 전력 송신기를 제외한 나머지 무선 전력 송신기가, 상기 마스터 무선 전력 송신기로부터 상기 위상 동기 기준 정보를 수신하고, 수신한 정보를 기준으로 위상 보정을 수행하는 것을 특징으로 하는 협업 무선 전력 전송 시스템.The cooperative wireless power transmission system of the wireless power transmitter other than the one master wireless power transmitter receives the phase synchronization reference information from the master wireless power transmitter and performs phase correction based on the received information. .
  4. 제3항에 있어서, 상기 위상 동기 기준 정보는The method of claim 3, wherein the phase synchronization reference information is
    해당 무선 전력 송신기와 무선 전력 수신기 간의 위상 오프셋 정보인 것을 특징으로 하는 협업 무선 전력 전송 시스템.Collaborative wireless power transmission system, characterized in that the phase offset information between the wireless power transmitter and the wireless power receiver.
  5. 제3항에 있어서, 상기 다수의 무선 전력 송신기는, 각각The method of claim 3, wherein the plurality of wireless power transmitter, respectively
    배열 안테나;Array antennas;
    상기 배열 안테나에 연결되어, 상기 배열 안테나를 통해 상기 하나의 무선 전력 수신기로부터 송출된 비콘 신호를 수신하고, 상기 배열 안테나로 소정 주파수 대역의 전력 신호를 출력하되, 하기의 디지털 신호 처리부의 제어에 따라서 상기 배열 안테나로 출력되는 전력 신호의 위상을 각각 조정하는 RF 신호 처리부; 및 It is connected to the array antenna, receives the beacon signal transmitted from the one wireless power receiver through the array antenna, and outputs a power signal of a predetermined frequency band to the array antenna, under the control of the digital signal processor An RF signal processing unit for adjusting a phase of a power signal output to the array antenna; And
    상기 수신된 비콘 신호를 분석하여 상기 배열 안테나 각각에 대응하는 다수 무선 채널 간의 위상차를 보상하도록 상기 RF 신호 처리부를 제어하는 디지털 신호 처리부;를 포함하는 것을 특징으로 하는 협업 무선 전력 전송 시스템.And a digital signal processor configured to analyze the received beacon signal and control the RF signal processor to compensate for a phase difference between a plurality of wireless channels corresponding to each of the array antennas.
  6. 제5항에 있어서, 상기 다수의 무선 전력 송신기는The method of claim 5, wherein the plurality of wireless power transmitter
    상호 간에 위상 동기 기준 정보를 송수신하는 통신 인터페이스부를 더 포함하고,Further comprising a communication interface for transmitting and receiving phase synchronization reference information between each other,
    상기 디지털 신호 처리부는 상기 통신 인터페이스부를 통해 수신된 정보에 기반하여, 동일한 시점에 위상 조정이 이루어지도록 상기 RF 신호 처리부를 제어하는 것을 특징으로 하는 협업 무선 전력 전송 시스템.And the digital signal processor controls the RF signal processor to perform phase adjustment at the same time, based on the information received through the communication interface.
  7. 서로 다른 위치에 분산 배치되어, 에너지 빔포밍 기반으로 RF 전력 신호를 송출하는 다수의 무선 전력 송신기를 이용한 협업 무선 전력 전송 방법에 있어서,In the cooperative wireless power transmission method using a plurality of wireless power transmitter that is distributed in different positions, and transmits the RF power signal based on the energy beamforming,
    상기 다수의 무선 전력 송신기가, The plurality of wireless power transmitter,
    무선 전력 수신기로부터 송출된 비콘 신호를 수신하여, 하나의 동일한 무선 전력 수신기의 위치를 확인하는 단계;Receiving a beacon signal transmitted from the wireless power receiver to identify a location of one same wireless power receiver;
    상기 확인된 하나의 무선 전력 수신기에 대한 무선 채널 간의 위상차 및 다른 무선 전력 송신기 간의 위상차를 산출하여, 상기 하나의 무선 전력 수신기에서 동일한 위상의 전력 신호가 수신되도록 상기 RF 전력 신호의 위상을 보정하는 단계; 및Calculating a phase difference between wireless channels for the identified one wireless power receiver and a phase difference between other wireless power transmitters, and correcting a phase of the RF power signal so that a power signal having the same phase is received at the one wireless power receiver. ; And
    위상 보정된 RF 전력 신호를 배열 안테나를 통해 상기 무선 전력 수신기로 송출하는 단계를 포함하는 것을 특징으로 하는 협업 무선 전력 전송 방법.And transmitting a phase corrected RF power signal to the wireless power receiver via an array antenna.
  8. 제7항에 있어서, The method of claim 7, wherein
    상기 다수의 무선 전력 송신기의 개수(N), 상기 무선 전력 수신기로부터 수신된 비콘 신호의 전계 강도, 사람의 근접 여부 중 하나 이상을 고려하여 상기 RF 전력 신호의 송출 전력을 조정하는 단계를 더 포함하는 것을 특징으로 하는 협업 무선 전력 전송 방법.Adjusting the transmission power of the RF power signal in consideration of one or more of the number N of the plurality of wireless power transmitters, the electric field strength of the beacon signal received from the wireless power receiver, and the proximity of a person; Collaborative wireless power transmission method, characterized in that.
  9. 제1항에 있어서, 상기 위상을 보정하는 단계는,The method of claim 1, wherein correcting the phase comprises:
    상기 다수의 무선 전력 송신기 중 하나를 마스터 무선 전력 송신기로 설정하고, 상기 하나의 마스터 무선 전력 송신기를 제외한 나머지 무선 전력 송신기가, 상기 마스터 무선 전력 송신기로부터 상기 위상 동기 기준 정보를 수신하고, 수신한 정보를 기준으로 상기 마스터 무선 전력 송신기 간의 위상차를 보정하도록 하는 것을 특징으로 하는 협업 무선 전력 전송 방법.Set one of the plurality of wireless power transmitters as a master wireless power transmitter, and the remaining wireless power transmitters except the one master wireless power transmitter receive the phase synchronization reference information from the master wireless power transmitter and receive the received information. Cooperative wireless power transmission method characterized in that to correct the phase difference between the master wireless power transmitter on the basis of.
PCT/KR2018/005461 2017-05-11 2018-05-11 Cooperative wireless power transfer system and method WO2018208130A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2017-0058893 2017-05-11
KR20170058893 2017-05-11
KR10-2018-0054374 2018-05-11
KR1020180054374A KR102220620B1 (en) 2017-05-11 2018-05-11 System and Method for wireless power transfer based on collaboration

Publications (1)

Publication Number Publication Date
WO2018208130A1 true WO2018208130A1 (en) 2018-11-15

Family

ID=64104723

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2018/005461 WO2018208130A1 (en) 2017-05-11 2018-05-11 Cooperative wireless power transfer system and method

Country Status (1)

Country Link
WO (1) WO2018208130A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200177031A1 (en) * 2018-11-30 2020-06-04 Ossia Inc. Distributed wireless power transmission system
WO2021101783A1 (en) * 2019-11-20 2021-05-27 Rutgers, The State University Of New Jersey In-body wireless charging system
CN113661660A (en) * 2019-02-06 2021-11-16 艾诺格思公司 System and method for estimating optimal phase for individual antennas in an antenna array
CN113655297A (en) * 2021-07-30 2021-11-16 中国航空工业集团公司济南特种结构研究所 Correction method for one-way power transmission efficiency of satellite communication antenna cover

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110134971A (en) * 2010-06-10 2011-12-16 삼성전자주식회사 Apparatus and method for transmit power beamforming using sub-transmitter in wireless power transmission systems
KR20130127228A (en) * 2012-05-14 2013-11-22 전자부품연구원 Magnetic energy beamforming method and apparatus for wireless power transmission
KR101497303B1 (en) * 2013-09-06 2015-03-03 한국과학기술원 Wireless power transfer apparatus for implantable medical device in human body using focused ultrasound beamforming technique
WO2016164243A1 (en) * 2015-04-10 2016-10-13 Ossia Inc. Techniques for imaging wireless power delivery environments and tracking objects therein
US20160380488A1 (en) * 2015-06-23 2016-12-29 Qualcomm Incorporated Systems, methods and apparatuses for guidance and alignment in electric vehicles wireless inductive charging systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110134971A (en) * 2010-06-10 2011-12-16 삼성전자주식회사 Apparatus and method for transmit power beamforming using sub-transmitter in wireless power transmission systems
KR20130127228A (en) * 2012-05-14 2013-11-22 전자부품연구원 Magnetic energy beamforming method and apparatus for wireless power transmission
KR101497303B1 (en) * 2013-09-06 2015-03-03 한국과학기술원 Wireless power transfer apparatus for implantable medical device in human body using focused ultrasound beamforming technique
WO2016164243A1 (en) * 2015-04-10 2016-10-13 Ossia Inc. Techniques for imaging wireless power delivery environments and tracking objects therein
US20160380488A1 (en) * 2015-06-23 2016-12-29 Qualcomm Incorporated Systems, methods and apparatuses for guidance and alignment in electric vehicles wireless inductive charging systems

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220376556A1 (en) * 2018-11-30 2022-11-24 Ossia Inc. Distributed wireless power transmission system
WO2020112711A1 (en) * 2018-11-30 2020-06-04 Ossia Inc. Distributed wireless power transmission system
US11962166B2 (en) 2018-11-30 2024-04-16 Ossia Inc. Distributed wireless power transmission system
US11677274B2 (en) 2018-11-30 2023-06-13 Ossia Inc. Distributed wireless power transmission system
EP3888226A4 (en) * 2018-11-30 2022-12-14 Ossia Inc. Distributed wireless power transmission system
US11394248B2 (en) 2018-11-30 2022-07-19 Ossia Inc. Distributed wireless power transmission system
US20200177031A1 (en) * 2018-11-30 2020-06-04 Ossia Inc. Distributed wireless power transmission system
US11463179B2 (en) 2019-02-06 2022-10-04 Energous Corporation Systems and methods of estimating optimal phases to use for individual antennas in an antenna array
CN113661660B (en) * 2019-02-06 2023-01-24 艾诺格思公司 Method of estimating optimal phase, wireless power transmitting apparatus, and storage medium
CN113661660A (en) * 2019-02-06 2021-11-16 艾诺格思公司 System and method for estimating optimal phase for individual antennas in an antenna array
US11784726B2 (en) 2019-02-06 2023-10-10 Energous Corporation Systems and methods of estimating optimal phases to use for individual antennas in an antenna array
WO2021101783A1 (en) * 2019-11-20 2021-05-27 Rutgers, The State University Of New Jersey In-body wireless charging system
CN113655297A (en) * 2021-07-30 2021-11-16 中国航空工业集团公司济南特种结构研究所 Correction method for one-way power transmission efficiency of satellite communication antenna cover
CN113655297B (en) * 2021-07-30 2024-04-09 中国航空工业集团公司济南特种结构研究所 Correction method for single-pass power transmission efficiency of toilet antenna housing

Similar Documents

Publication Publication Date Title
WO2018208130A1 (en) Cooperative wireless power transfer system and method
KR102220620B1 (en) System and Method for wireless power transfer based on collaboration
WO2014038779A1 (en) Method for communication and power control of wireless power transmitter in magnetic resonant wireless power transmission system
WO2014178688A1 (en) Method and apparatus for measuring and feeding back channel information in communication system using beam forming
WO2014003503A1 (en) Method and apparatus for transmitting signal in beam forming-based communication system
WO2013069951A4 (en) Wireless power transmission and receiving system capable of multi charge
WO2014175664A1 (en) Method and apparatus for controlling power of uplink in a beam forming system
WO2013191398A1 (en) Power transmitter and method for controlling power transmission
WO2013089458A1 (en) Device and method for wirelessly transmitting power so as to minimize the impact on the human body
WO2012091209A1 (en) Multi-node wireless power transmission system using magnetic resonance induction and wireless charging device
WO2013002516A2 (en) Wireless power repeater and method thereof
WO2013115419A1 (en) Wireless power transmission apparatus capable of matching impedance
WO2015167054A1 (en) Wireless power relay device and wireless power transmission system
EP3151375A1 (en) POWER RECEIVER, WIRELESS POWER TRANSMISSION SYSTEM, AND kQ-VALUE CALCULATION METHOD
KR20130064840A (en) Wireless power transmission apparatus and method converging wireless power to a specific device
WO2013172519A1 (en) Method and device for magnetic energy beamforming in wireless power transmission
WO2013032129A1 (en) Wireless power transmitter and wireless power transmission method
WO2016114629A1 (en) Wireless power transmission device
US10873222B2 (en) System and method for preventing cross connection in wireless charging
WO2020218889A1 (en) Position measuring device
WO2020086780A1 (en) Power distribution system
WO2016195218A1 (en) Wireless charging system
WO2016064254A1 (en) Wireless power transmission device and wireless power transmission system
WO2013176370A1 (en) Antenna phase conversion device and antenna phase conversion system
WO2020141798A1 (en) Wireless power transmission device and operating method therefor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18797865

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18797865

Country of ref document: EP

Kind code of ref document: A1