WO2014171774A1

WO2014171774A1 - Wireless power transmission apparatus and method therefor

Info

Publication number: WO2014171774A1
Application number: PCT/KR2014/003378
Authority: WO
Inventors: 원윤재; 임승옥
Original assignee: 인텔렉추얼 디스커버리 주식회사
Priority date: 2013-04-17
Filing date: 2014-04-17
Publication date: 2014-10-23

Abstract

The present invention relates to a wireless power transmission apparatus and a method therefor. The present invention provides a wireless power transmission apparatus including: a power transmission module; a first communication module; a second communication module; and a controller for searching out a first wireless power reception device performing wireless power transmission/reception, transmitting a second magnetic field signal of a second frequency band through the power transmission module, sensing a second response signal to the second magnetic field signal through the second communication module, and searching out a second wireless power reception device performing wireless power transmission/reception by means of the second frequency band according to whether the second response signal is received.

Description

Wireless power transmitter and wireless power transfer method

The present invention relates to a wireless power transmission apparatus and a wireless power transmission method, and more particularly, to a wireless power transmission apparatus and a wireless power transmission method for searching for a plurality of wireless power receiving apparatus using a different wireless power transmission and reception method.

Wireless power transfer technology is a technology for wirelessly transferring power between a power source and an electronic device. For example, the wireless power transfer technology allows a mobile terminal such as a smartphone or a tablet to be charged wirelessly by simply placing it on a wireless charging pad, thereby providing a wireless charging environment using a conventional wired charging connector. It can provide greater mobility, convenience and safety. In addition, the wireless power transmission technology is attracting attention to replace the existing wired power transmission environment in various fields such as home appliances, electric vehicles, medical, leisure, robots, in addition to wireless charging of the mobile terminal.

The wireless power transmission technology can be classified into a technique using electromagnetic radiation and a technique using electromagnetic induction. The technique using electromagnetic radiation has a limitation in efficiency due to radiation loss consumed in the air. Many techniques using electromagnetic induction have been studied.

The wireless power transmission technology using electromagnetic induction is largely classified into electromagnetic inductive coupling and resonant magnetic coupling.

Electromagnetic induction is a method of transmitting energy by using a current induced in a receiving coil due to a magnetic field generated by the transmitting coil according to an electromagnetic coupling between the transmitting coil and the receiving coil. Electromagnetic induction wireless power transmission technology has the advantage of high transmission efficiency, but the power transmission distance is limited to a few mm, and has a very low positional freedom because it is very sensitive to matching between coils.

The magnetic resonance method is a technique proposed by Professor Marine Solar Beach of MIT in 2005. The magnetic energy is concentrated by the magnetic field applied at the resonant frequency between the transmitting coil and the receiving coil. It is a transmission method.

This magnetic resonance method is capable of transmitting energy from a distance of several tens of centimeters to several meters in comparison with the electromagnetic induction method, and also capable of transmitting power to multiple devices at the same time, thereby making it truly cord-free. It is expected to be the wireless power transfer technology to be implemented.

However, in recent years, various standards are struggling in the wireless power transmission market. Typical wireless power transfer standards include industry standards such as the WPC Qi standard, the A4WP standard led by Qualcomm and Samsung, and the PMA standard led by Power Mat. In this situation, there is a problem in that a wireless power transmission service cannot be provided between a wireless power transmitter and a wireless power receiver that follow different standards.

One object of the present invention is to provide a wireless power transmitter and a wireless power transfer method for searching for a plurality of wireless power receivers using different wireless power transmission and reception methods.

The problem to be solved by the present invention is not limited to the above-described problem, the objects that are not mentioned will be clearly understood by those skilled in the art from the present specification and the accompanying drawings. .

According to an aspect of the present invention, a power transmission module for transmitting wireless power using any one of a magnetic field of a first frequency band and a magnetic field of a second frequency band different from the first frequency band; A first communication module; A second communication module; And transmitting a first magnetic field signal of the first frequency band through the power transmission module, sensing a first response signal to the first magnetic field signal through the first communication module, and receiving the first response signal. Searching for a first wireless power receiver that performs wireless power transmission and reception using the first frequency band based on whether the second frequency band is transmitted, and transmitting a second magnetic field signal of the second frequency band through the power transmission module; A second wireless power reception for detecting a second response signal to the second magnetic field signal through a communication module and performing wireless power transmission and reception using the second frequency band based on whether the second response signal is received; A controller for searching for a device may be provided.

According to another aspect of the invention, the first frequency band of the first frequency band through a power transmission module for transmitting wireless power using any one of the magnetic field of the first frequency band and the magnetic field of the second frequency band different from the first frequency band. Transmitting a magnetic field signal; Sensing a first response signal to the first magnetic field signal through a first communication module; Searching for a first wireless power receiver that performs wireless power transmission and reception using the first frequency band based on whether the first response signal is received; Transmitting a second magnetic field signal of the second frequency band through the power transmission module; Sensing a second response signal to the second magnetic field signal through the second communication module; And searching for a second wireless power receiver for performing wireless power transmission / reception using the second frequency band based on whether the second response signal is received.

Means for solving the problems of the present invention are not limited to the above-described solutions, and the solutions not mentioned above may be clearly understood by those skilled in the art from the present specification and the accompanying drawings. There will be.

According to the present invention, one wireless power transmitter may transmit power to a plurality of wireless power receivers using different wireless power transmission and reception methods.

The effects of the present invention are not limited to the above-described effects, and effects that are not mentioned will be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

1 is a block diagram of a wireless power system according to an embodiment of the present invention.

2 is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.

3 is a block diagram of a first form of a wireless power receiver according to an embodiment of the present invention.

4 is a block diagram of a second form of a wireless power receiver according to an embodiment of the present invention.

5 is a schematic diagram of communication in a wireless power network according to an embodiment of the present invention.

6 is a schematic diagram of wireless power transfer in a wireless power network according to an embodiment of the present invention.

7 is a flowchart illustrating a method of transmitting and receiving wireless power according to an embodiment of the present invention.

8 is a detailed flowchart of a step of configuring a communication network in a wireless power transmission and reception method according to an embodiment of the present invention.

9 is a detailed flowchart of a step of configuring a charging network in a wireless power transmission and reception method according to an embodiment of the present invention.

10 is a detailed flowchart of the step of transmitting and receiving power in the wireless power transmission and reception method according to an embodiment of the present invention.

11 and 12 are operation diagrams of the wireless power network in the step of transmitting and receiving power in the wireless power transmission and reception method according to an embodiment of the present invention.

Since the embodiments described herein are intended to clearly explain the spirit of the present invention to those skilled in the art, the present invention is not limited to the embodiments described herein, and the present invention. The scope of should be construed to include modifications or variations without departing from the spirit of the invention.

The terms used in the present specification and the accompanying drawings are for easily explaining the present invention, and the shapes shown in the drawings are exaggerated and displayed to help understanding of the present invention as necessary, and thus, the present invention is used herein. It is not limited by the terms and the accompanying drawings.

In the present specification, when it is determined that a detailed description of a known configuration or function related to the present invention may obscure the gist of the present invention, a detailed description thereof will be omitted as necessary.

The first communication module may be an in-band communication module using a magnetic field of the first frequency band, and the second communication module may be an in-band communication module using a magnetic field of the second frequency band.

The first communication module may be an in-band communication module using a magnetic field of the first frequency band, and the second communication module may be an out-band communication module for performing communication using a communication carrier different from the magnetic field. Can be.

The second communication module may be a communication module that performs any one of Bluetooth, Zigbee, Wi-Fi, NFC, and RFID. .

When the first response signal is received for a first predetermined time, the controller determines that the first wireless power receiver exists within a wireless power transmission range, and determines that the first wireless power reception device exists within the first predetermined time. If no response signal is received, it is determined that the first wireless power receiver does not exist within the wireless power transmission range, and when the second response signal is received for a second predetermined time, it is within the wireless power transmission range. If it is determined that the second wireless power receiver exists, and the second response signal is not received during the predetermined time, it is determined that the second wireless power receiver does not exist within the wireless power transmission range. can do.

The controller may detect the first response signal for a first predetermined time after transmitting the first magnetic field signal, and transmit the second magnetic field signal when the first predetermined time elapses.

The controller may allocate a first ID to the first wireless power receiver and provide a second ID to the second wireless power transmitter when the first wireless power receiver and the second wireless power receiver are found. Can be assigned.

The controller may transmit a message including the first ID information to the first wireless power receiver through the first communication module, and send a message including the second ID information through the second communication module. The second wireless power receiver may be transmitted.

In the searching of the first wireless power receiver, when the first response signal is received during the first predetermined time, it is determined that the first wireless power receiver exists within a wireless power transmission range, In the step of determining that the first wireless power receiver does not exist within the wireless power transmission range when the first response signal is not received for a first predetermined time, and searching for a second wireless power receiver, When the second response signal is received for a second predetermined time, it is determined that the second wireless power receiver exists within a wireless power transmission range, and the second response signal is not received for the second predetermined time. In this case, it may be determined that the second wireless power receiver does not exist within the wireless power transmission range.

The detecting of the first response signal may include performing the first magnetic field signal after transmitting the first magnetic field signal, and transmitting the second magnetic field signal may include transmitting the first magnetic field signal. It may be performed when the first predetermined time has elapsed.

When the first wireless power receiver and the second wireless power receiver are found, allocating a first ID to the first wireless power receiver and allocating a second ID to the second wireless power transmitter. It may further include;

The method may further include transmitting a message including the first ID information to the first wireless power receiver through the first communication module and sending a message including the second ID information through the second communication module. The step of transmitting to the wireless power receiver; Wireless power transmission method further comprising.

Hereinafter, a wireless power system 1000 according to an embodiment of the present invention will be described.

The wireless power system 1000 may wirelessly transmit power using a magnetic field.

1 is a block diagram of a wireless power system 1000 according to an embodiment of the present invention.

Referring to FIG. 1, the wireless power system 1000 includes a wireless power transmitter 1100 and a wireless power receiver 1200. The wireless power transmitter 1100 receives a power from an external power source S to generate a magnetic field. The wireless power receiver 1200 generates a current by using the generated magnetic field to receive power wirelessly.

In addition, in the wireless power system 1000, the wireless power transmitter 1100 and the wireless power receiver 1200 may transmit and receive various information required for wireless power transmission. Here, the communication between the wireless power transmitter 1100 and the wireless power receiver 1200 may be performed in-band communication using a magnetic field used for wireless power transmission or out-band communication using a separate communication carrier. may be performed according to any one of out-band communication.

Here, the wireless power transmitter 1100 may be provided in a fixed or mobile type. Examples of the fixed type are embedded in furniture such as ceilings, walls, or tables in the interior, implants in outdoor parking lots, bus stops, subway stations, or in vehicles or trains. There is this. The mobile wireless power transmitter 1100 that is mobile may be implemented as part of another device such as a mobile device of a movable weight or size or a cover of a notebook computer.

In addition, the wireless power receiver 1200 should be interpreted as a comprehensive concept including various electronic devices including batteries and various home appliances that are driven and driven by wireless power instead of power cables. Representative examples of the wireless power receiver 1200 include a mobile terminal, a cellular phone, a smart phone, a personal digital assistant (PDA), and a portable media player (PMP). Portable Media Players, Wibro terminals, tablets, tablets, notebooks, digital cameras, navigation terminals, televisions, and electric vehicles (EVs).

In the wireless power system 1000, the wireless power receiver 1200 may be one or plural. In FIG. 1, the wireless power transmitter 1100 and the wireless power receiver 1200 are represented as one-to-one power, but one wireless power transmitter 1100 is connected to the plurality of wireless power receivers 1200. It is also possible to deliver power. In particular, in the case of performing wireless power transmission in a magnetic resonance method, one wireless power transmitter 1100 may simultaneously transmit power to multiple wireless power receivers 1200 by applying a simultaneous transmission method or a time division transmission method. .

Although not shown in FIG. 1, the wireless power system 1000 may further include a relay for increasing the wireless power transmission distance. As a repeater, a passive type resonance loop implemented by an LC circuit may be used. Such a resonant loop may focus the magnetic field radiated to the atmosphere to increase the wireless power transmission distance. It is also possible to secure wider wireless power transfer coverage using multiple repeaters at the same time.

Hereinafter, a wireless power transmitter 1100 according to an embodiment of the present invention will be described.

The wireless power transmitter 1100 may transmit power wirelessly.

2 is a block diagram of a wireless power transmission device 1100 according to an embodiment of the present invention.

Referring to FIG. 2, the wireless power transmission apparatus 1100 may include a power transmission module 1110, a transmission antenna 1120, a communication module 1130, and a controller 1140.

The power transfer module 1110 may generate transmit power using power applied from an external power source S. The power transfer module 1110 may include an AC-DC converter 1111, a frequency oscillator 1112, a power amplifier 1113, and an impedance matcher 1114.

The AC-DC converter 1111 may convert AC power into DC power. The AC-DC converter 1111 receives AC power from an external power source S, converts the waveform of the input AC power into DC power, and outputs the AC power. The AC-DC converter 1111 may adjust the voltage value of the DC power output.

The frequency oscillator 1112 may convert DC power into AC power of a specific frequency desired. The frequency oscillator 1112 receives DC power output from the AC-DC converter 1111, converts the input DC power into AC power of a specific frequency, and outputs the DC power. Here, the specific frequency may be a resonance frequency. In this case, the frequency oscillator 1112 may output AC power having a resonance frequency. Of course, the frequency oscillator 1112 does not necessarily have to oscillate the resonant frequency.

The power amplifier 1113 may amplify a voltage or current of power. The power amplifier 1113 receives AC power of a specific frequency output by the frequency oscillator 1112, and amplifies and outputs a voltage or current of AC power of the input specific frequency.

The impedance matcher 1114 may perform impedance matching. Impedance matcher 1114 may include a capacitor, an inductor, and a switching element for switching their connections. The impedance matching detects the reflected wave of the wireless power transmitted through the transmission antenna 1120 and switches the switching element based on the detected reflected wave to adjust the connection state of the capacitor or the inductor, adjust the capacitance of the capacitor, or the inductance of the inductor. This can be done by adjusting.

The transmission antenna 1120 may generate an electromagnetic field using AC power. The transmit antenna 1120 may receive AC power of a specific frequency output from the power amplifier 1113 and thus generate a magnetic field of a specific frequency. The generated magnetic field is radiated, and the wireless power receiver 1200 receives this to generate a current. In other words, the transmission antenna 1120 transmits power wirelessly.

The communication antenna 1125 may transmit and receive communication signals using communication carriers other than magnetic field communication. For example, the communication antenna 1125 may transmit and receive communication signals such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

The communication module 1130 may transmit / receive information with the wireless power receiver 1200. The communication module 1130 may include an in-band communication module 1131 and an out-band communication module 1132.

The in-band communication module 1131 may transmit and receive information using a magnetic wave having a specific frequency as a center frequency. For example, the communication module 1130 may perform in-band communication by loading information on magnetic waves through a transmission antenna 1120 or receiving magnetic waves containing information through a transmission antenna 1120. . In this case, modulation schemes such as binary phase shift keying (BPSK) or amplitude shift keying (ASK) and Manchester coding or non-return-to-zero (NZR-L) By using a coding method such as level) coding, magnetic waves containing information or magnetic waves containing information can be interpreted. Using such in-band communication, the communication module 1130 may transmit and receive information up to a distance of several meters at a data rate of several kbps.

The out-band communication module 1132 may perform out-band communication through the communication antenna 1125. For example, the communication module 1130 may be provided as a short range communication module. Examples of a short range communication module include a communication module such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, NFC, and the like.

The controller 1140 may control the overall operation of the wireless power transmitter 1100. The controller 1140 may calculate and process various types of information and control each component of the wireless power transmitter 1100.

The controller 1140 may be implemented as a computer or a similar device using hardware, software, or a combination thereof. In hardware, the controller 1140 may be provided in the form of an electronic circuit that processes an electrical signal to perform a control function. In software, the controller 1140 may be provided in the form of a program for driving the hardware controller 1140.

Hereinafter, a wireless power receiver 1200 according to an embodiment of the present invention will be described.

The wireless power receiver 1200 may wirelessly receive power.

3 is a block diagram of a first form of a wireless power receiver 1200 according to an embodiment of the present invention.

Referring to FIG. 3, the wireless power receiver 1200 may include a reception antenna 1210, a power reception module 1220, a communication module 1230, and a controller 1240.

The receiving antenna 1210 may receive wireless power transmitted from the wireless power transmitter 1100. The receiving antenna 1210 may receive power by using a magnetic field radiated from the transmitting antenna 1120. In this case, when a specific frequency is a resonant frequency, a magnetic resonance phenomenon may occur between the transmitting antenna 1120 and the receiving antenna 1210 to more efficiently receive power.

The power receiving module 1220 may charge or drive the wireless power receiving apparatus 1200 using the power received by the receiving antenna 1210. The power receiving module 1220 may include an impedance matcher 1221, a rectifier 1222, a DC-DC converter 1223, and a battery 1224.

The impedance matcher 1221 may adjust the impedance of the wireless power receiver 1200. The impedance matcher 1221 may be composed of a switching element for switching a capacitor, an inductor, and a combination thereof. The matching of the impedance may be performed by controlling the switching elements of the circuit constituting the impedance matcher 1221 based on the voltage value, current value, power value, frequency value, etc. of the received wireless power.

The rectifier 1222 may rectify the received wireless power and convert it from AC to DC. The rectifier 1222 may convert an alternating current into a direct current using a diode or a transistor, and smooth it using a capacitor and a resistor. As the rectifier 1222, a full-wave rectifier, a half-wave rectifier, a voltage multiplier, or the like implemented by a bridge circuit may be used.

The DC-DC converter 1223 may convert the voltage of the rectified DC power to a desired level and output the converted level. When the voltage value of the DC power rectified in the rectifier 1222 is larger or smaller than the voltage value required for charging the battery or driving the electronic device, the DC-DC converter 1223 may select the voltage value of the rectified DC power. Can be changed to voltage.

The battery 1224 may store energy using power output from the DC-DC converter 1223. Meanwhile, the battery 1224 is not necessarily included in the wireless power receiver 1200. For example, the battery may be provided in an external configuration of a removable form. For another example, the wireless power receiver 1200 may include driving means for driving various operations of the electronic device instead of the battery 1224.

The communication module 1230 may transmit / receive information with the wireless power transmitter 1200. In a first form of the wireless power receiver 1200, the communication module 1230 may perform in-band communication.

The in-band communication type communication module 1230 may transmit and receive information using a magnetic wave having a specific frequency as a center frequency. For example, the communication module 1230 may perform in-band communication by loading information on magnetic waves through the receiving antenna 1210 or receiving magnetic waves containing information through the receiving antenna 1210. . In this case, modulation schemes such as binary phase shift keying (BPSK) or amplitude shift keying (ASK) and Manchester coding or non-return-to-zero (NZR-L) By using a coding method such as level) coding, magnetic waves containing information or magnetic waves containing information can be interpreted. Using this in-band communication, the communication module 1230 can transmit and receive information up to a distance of several meters at a data rate of several kbps.

The controller 1240 may control the overall operation of the wireless power receiver 1200. The controller 1240 may perform calculation and processing of various information and control each component of the wireless power receiver 1200.

The controller 1240 may be implemented as a computer or a similar device using hardware, software, or a combination thereof. In hardware, the controller 1240 may be provided in the form of an electronic circuit that processes an electrical signal to perform a control function. In software, the controller 1240 may be provided in the form of a program for driving the hardware controller 1240.

4 is a block diagram of a second form of a wireless power receiver 1200 according to an embodiment of the present invention.

Referring to FIG. 4, the second type of wireless power receiver 1200 may further include a communication antenna 1215 in the configuration of the first type of wireless power receiver 1200. In the second type of wireless power receiver 1200, the communication module 1230 may be an out-band type communication module.

The communication antenna 1215 may transmit and receive communication signals using communication carriers other than magnetic field communication. For example, the communication antenna 1215 may transmit and receive communication signals such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

The communication module 1230 is an out-band communication module and may perform out-band communication through the communication antenna 1215. For example, the communication module 1130 may be provided as a short range communication module. Examples of a short range communication module include a communication module such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, NFC, and the like.

Accordingly, in the second form of the wireless power receiver 1200, wireless power may be received through the reception antenna 1210, and communication with the wireless power transmitter 1100 may be performed through the communication antenna 1215.

Hereinafter, a process of wirelessly transmitting power in the wireless power system 1000 according to an embodiment of the present invention will be described.

Wireless transmission of power may be performed using electromagnetic induction or magnetic resonance. In this case, the transmission antenna 1120 of the wireless power transmitter 1100 and the reception antenna 1210 of the wireless power receiver 1200 may be performed.

In the case of using the magnetic resonance method, the transmitting antenna 1120 and the receiving antenna 1210 may be provided in the form of a resonant antenna, respectively. The resonant antenna may have a resonant structure including a coil and a capacitor. At this time, the resonant frequency of the resonant antenna is determined by the inductance of the coil and the capacitance of the capacitor. Here, the coil may be in the form of a loop. In addition, a core may be disposed inside the loop. The core may include a physical core such as a ferrite core or an air core.

Energy transmission between the transmitting antenna 1120 and the receiving antenna 1210 may be achieved through a resonance phenomenon of the magnetic field. The resonance phenomenon refers to a phenomenon in which a high efficiency energy transfer occurs between two resonant antennas when two resonant antennas are coupled to each other when a resonant frequency corresponding to a resonant frequency occurs in one resonant antenna. . When a magnetic field corresponding to a resonant frequency is generated between the resonant antenna of the transmit antenna 1120 and the resonant antenna of the receive antenna 1210, a resonance phenomenon in which the resonant antennas of the transmit antenna 1120 and the receive antenna 1210 resonate with each other occurs. Accordingly, the magnetic field is focused toward the receiving antenna 1210 with higher efficiency than when the magnetic field generated by the transmitting antenna 1120 is radiated into free space in general, and thus the receiving antenna (from the transmitting antenna 1120) Energy can be delivered to 1210 with high efficiency.

The electromagnetic induction method may be implemented similarly to the magnetic resonance method, but in this case, the frequency of the magnetic field does not need to be a resonance frequency. Instead, the electromagnetic induction method requires matching between the loops constituting the receiving antenna 1210 and the transmitting antenna 1120 and the spacing between the loops is very close.

Hereinafter, a wireless power network 2000 according to an embodiment of the present invention will be described.

The wireless power network 2000 may refer to a network that performs wireless power transmission and communication.

5 is a schematic diagram of communication in a wireless power network 2000 according to an embodiment of the present invention, and FIG. 6 is a schematic diagram of wireless power transmission in a wireless power network 2000 according to an embodiment of the present invention.

5 and 6, the wireless power network 2000 may include a wireless power charger (WPC: 2100) and a wireless power receiver (WPR). It may include, WPR, 2200). Here, the charger 2100 may be provided as a device that performs the same or similar function as the above-described wireless power transmitter 1100 or the wireless power transmitter 1100. In addition, the receiver 2200 may be provided as a device that performs the same or similar functions as the first or second forms of the wireless power receiver 1200 described above.

Therefore, hereinafter, operations performed by the charger 2100 may be performed by each component of the wireless power transmitter 1100, and operations performed by the receiver 2200 may be performed by the wireless power receiver 1200. Can be performed by each component. For example, communication between the charger 2100 and the receiver 2200, which will be described later, is performed by the

communication modules

1131 and 1230 in an in-band communication manner through the transmitting antenna 1120 and the receiving antenna 1210, or the communication. It may be performed by the

communication modules

1132 and 1230 in an out-band communication manner through the

antennas

1125 and 1215. In addition, the transmission and reception of wireless power may be performed by the power transmission module 1110 and the power reception module 1220 through a magnetic resonance method or an electromagnetic induction method through the transmission antenna 1120 and the reception antenna 1210. Similarly, various controls and operations including selection of a power transmission mode, allocation of time slots, activation of a receiver 2200, and deactivation of a receiver, which will be described later, may be performed by the

controllers

1140 and 1240.

The wireless power network 2000 may be provided in the form of a star topology in which one or more receivers 2200 are disposed around the charger 2100. The charger 2100 may radiate a magnetic field around the charger 2100. Accordingly, a communication zone and a charging zone may be formed around the charger 2100.

Here, the communication area means an area in which the charger 2100 can communicate with the receiver 2200, and the charging area actually uses the magnetic field received from the charger 2100 to charge the battery or the receiver 2200. ) Means an area that can be driven.

The communication area may include a charging area therein. For example, when the communication is performed in the in-band manner in the wireless power network 2000, the communication area may be a range in which communication packets can be transmitted and received with the receiver 2200 by a magnetic field radiated from the charger 2100. The charging region may be in a range in which sufficient power may be transmitted for driving the receiver 2200 or charging the battery by a magnetic field radiated from the charger 2100. The power delivered by the magnetic field radiated from the charger 2100 decreases as the distance increases, while for charging or driving the receiver 2200, more than a predetermined power must be transmitted by the magnetic field, whereas the magnetic field communication transmits and receives packets. Since this constraint is relatively less, the charging area is formed narrower than the communication area. Of course, it is also possible that the communication area and the charging area coincide. On the other hand, when the communication is performed in the out-band type, in general, the range of the local area network is wider than the distance of the wireless power transmission, the communication area can be formed wider than the charging area.

Whether the receiver 2200 belongs to a charging region or a communication region other than the charging region may be determined by whether the receiver 2200 is capable of normal charging (or driving). For example, the charger 2100 may determine whether the receiver 2200 is capable of normal charging based on the strength of the magnetic field signal received from the receiver 2200. Alternatively, the receiver 2200 may determine whether normal charging is possible based on the strength of the magnetic field signal emitted from the charger 2100, and transmit the result to the charger 2100.

Referring back to FIG. 5, the charger 2100 may exchange information with a receiver 2200 in a communication area including a charging area by transmitting and receiving a communication carrier according to a magnetic field signal or out-band communication with each other. Referring to FIG. 6, the charger 2100 may perform wireless power transmission using a magnetic field to the receiver 2200 located in the charging area among the receivers 2200.

5 and 6 illustrate that the charging area and the communication area are spatially precisely divided with concentric circles, respectively, but the shape of the charging area and the communication area may be changed according to the characteristics of the receiver 2200. For example, a wider charging area may be provided for the receiver 2200 having a lower charging voltage of the battery than the receiver 2200 having a high charging voltage.

Hereinafter, a wireless power transmission and reception method according to an embodiment of the present invention will be described. The wireless power transmission and reception method will be described using the wireless power network 2000 described above. However, the present invention is not limited to the wireless power transmission / reception method, and may be performed using another system similar to the same.

Referring to FIG. 7, the wireless power transmission / reception method may include: searching for a receiver 2200 (S110), setting a communication network (S120), setting a power network (S130), and setting a power transmission mode. In operation S140, the method may include transmitting and receiving wireless power (S150). Hereinafter, each step described above will be described in more detail.

First, the charger 2100 may search for the receiver 2200 located in the vicinity (S110).

Here, the receiver 2200 may perform wireless power transmission and reception according to a method according to various wireless power transmission and reception protocols. For example, the receiver 2200 may include a Qi standard of the Wireless Power Consortium (WPC), a wireless power transmission and reception standard of the Alliance For Wireless Power (A4WP), a wireless power transmission and reception standard of the Power Matteres Alliance (PMA), and Near Field Communication (NFC). Or wireless power transmission standards driven by Radio Frequency Identification (RFID), ISO / IEC SC6, ISO TC100, CJK wireless power transmission standards and at least one of a variety of other national, international or industry standards. It can operate according to the power transmission and reception protocol or communication protocol.

The charger 2100 may perform communication and power transmission and reception according to a method defined by a plurality of standards. As a result, the charger 2100 may search for the receiver 2200 according to different standard standards.

The charger 2100 may periodically broadcast a scanning signal according to a plurality of standard specifications. The scanning signal may use various communication carriers of various frequency bands. In detail, in the case of the Qi standard, a magnetic field signal of a specific frequency band is transmitted to search for a receiver 2200 in the vicinity, and in the case of the A4WP standard, a magnetic field signal of another frequency band is transmitted in order to search for a receiver 2200 in the vicinity. do.

Each receiver 2200 may transmit a response signal to the charger 2100 in response to a scanning signal according to a standard method applied to the receiver 2200. The charger 2100 may analyze the response signal to determine which standard the receiver 2200 is applied to.

In detail, a method of searching for the receiver 2200 will be described with reference to FIG. 8. 8 is a detailed flowchart of a step of configuring a communication network in a wireless power transmission and reception method according to an embodiment of the present invention.

Here, the charger 2100 is a device capable of performing wireless power transmission and reception according to the first standard, the second standard, and the third standard. The first receivers WPR-1 and 2200a are devices to which the first standard for wireless power transmission and reception is applied, and the second receivers WPR-2 and 2200b are devices to which the second standard for wireless power transmission and reception are applied.

Referring to FIG. 8, the charger 2100 may broadcast a first scanning signal according to a first standard, a second scanning signal according to a second standard, and a third scanning signal according to a third standard. Here, the first scanning signal, the second scanning signal, and the third scanning signal are signals defined by different standards, and at least one of the frequency band and the communication carrier may be different. For example, the first scanning signal may be a magnetic field signal in a 100 ~ 200KHz band, the second scanning signal may be a magnetic field signal in a 6.78Mhz band, and the third scanning signal may be an RFID signal.

The charger 2100 may transmit each scanning signal and receive a response signal according to a corresponding standard for a predetermined time. In this case, the first receiver 2200a transmits a first response signal according to the first standard to the charger 2100 in response to the first scanning signal. Similarly, the second receiver 2200b transmits a second response signal according to the second standard to the charger 2100 in response to the second scanning signal. In addition, the first receiver 2200a and the second receiver 2200b do not respond to the third scanning signal according to the third standard. Here, the first response signal and the second response signal have a frequency band and a communication carrier according to the first standard and the second standard, respectively.

When the charger 2100 receives the first response signal and the second response signal, the charger 2100 determines that there is a first receiver 2200a according to the first standard in accordance with the first response signal. It can be determined that there is a second receiver 2200b according to the second standard. In addition, the charger 2100 may determine a standard applied to the peripheral receivers 2200 based on each response signal.

The charger 2100 may search for a neighboring receiver 2200 through the above-described process.

In the above description, the charger 2100 determines the existence of the receiver 2200 when the charger 2100 receives the response signal. However, when the charger 2100 transmits the scanning signal, the charger 2100 detects the change in the impedance or reflected wave. It is also possible to detect the presence of the receiver 2200 and the standard used by the receiver 2200 by detecting it. In this case, a magnetic field is used as a carrier of the scanning signal, and the process of receiving the response signal may be omitted.

The charger 2100 may set a communication network (S120). In detail, the charger 2100 may join the retrieved receivers 2200 to the communication network.

The charger 2100 may transmit a connection request message to the retrieved receivers 2200. In this case, the connection request message transmitted to each receiver 2200 may be a signal according to a standard determined to be used by the receiver 2200 in the process of detecting the receiver 2200. When receiving the connection request message, the receiver 2200 may transmit a connection response message including identification information (eg, a device address such as a MAC address) of the receiver 2200 to the charger 2100 in response. . Here, the access response message is a signal defined in a standard applied to the corresponding receiver 2200 and may be an in-band communication signal or an out-band communication signal having a frequency band according to the standard.

The charger 2100 may allocate a communication ID COM to each receiver 2200 based on the response signal, and transmit a communication network setting message including the communication ID to each receiver 2200. The receiver 2200 may recognize its ID based on the communication ID included in the communication network setting message, and transmit a confirmation message to the charger 2100.

Specifically, a method of setting a communication network will be described with reference to FIG. 8 again.

Referring to FIG. 8, the charger 2100 transmits a first connection request message to the first receiver 2200a. In response, the first receiver 2200a may transmit a first connection response message including identification information of the first receiver 2200a to the charger 2100. The charger 2100 allocates a first communication ID COM-1 to the first receiver 2200a based on the identification information, and transmits a communication network setting message including the first communication ID COM-1 to the first message. Transmit to receiver 2200a. The first receiver 2200a sets the first communication ID COM-1 as its communication ID, and transmits a confirmation message to the charger 2100.

When the communication ID setting of the first receiver 2200a is finished, the charger 2100 transmits a second connection request message to the second receiver 2200b. In response, the second receiver 2200b may transmit a second connection response message including identification information of the second receiver 2200b to the charger 2100. The charger 2100 allocates a second communication ID COM-2 to the second receiver 2200b based on the identification information, and transmits a communication network setting message including the second communication ID COM-2 to the second receiver 2200b. Transmit to receiver 2200b. The second receiver 2200b sets the second communication ID COM-2 as its communication ID and transmits a confirmation message to the charger 2100.

Here, the message used for setting the communication network may be implemented in a message format defined in the standard used by the receiver 2200 for each receiver 2200 corresponding to the message. Since the charger 2100 may determine which standard each receiver 2200 uses in the search phase of the receiver 2200, the charger 2100 may determine a format of a message to be transmitted and received with each receiver 2200 based on the standard. have.

That is, the first connection request message and the first connection response message are provided as signals of a frequency band and a carrier according to the first standard, respectively, and the second connection request message and the second connection response message are each a frequency band according to the second standard. And a carrier signal. Accordingly, the first connection request message and the first connection response message and the second connection request message and the second connection response message may differ in at least one of a frequency band, a communication scheme (in-band or out-band), and a communication carrier. have.

Similarly, the communication network setting message and confirmation message transmitted and received by the charger 2100 to and from the first receiver 2200a, and the communication network setting message and confirmation message transmitted and received to and from the second receiver 2200b are respectively applied to the first and second standards. According to the signal, at least one of the frequency band, the communication scheme, and the communication carrier may be different.

As a result, a communication ID is assigned to each receiver 2200 to establish a communication network. When the setting of the communication network is completed, the charger 2100 may communicate with each receiver 2200 using a communication ID assigned to each receiver 2200 in the communication network setting.

When the setting of the communication network is completed, the charger 2100 may set the power network (S130).

The charger 2100 may transmit a device profile request message to the receiver 2200. In response, the receiver 2200 may transmit a device profile response message including the device profile to the charger 2100. Here, the device profile includes information on standards used for wireless power transmission and reception of the receiver 2200, information on standards used for communication, and types of power transmission / reception modes supported (simultaneous mode, time division mode, simultaneous mode and time division mode are combined). Time-division simultaneous mode), type of receiver 2200 (e.g., feature phones, smartphones, tablets, etc.), power value (battery or current) for battery charging, battery status (full or fully charged, What percentage is charged, etc.).

The charger 2100 may determine whether the wireless power transfer scheme supported by the charger 2100 and the wireless power transfer scheme applied to the receiver 2200 are compatible with each other based on the device profile. For example, if the charger 2100 supports wireless power transfer according to the Qi standard and the A4WP standard, the charger 2100 may receive the wireless power according to one of the two standards. It may be determined that the receiver 2200 is compatible. On the contrary, when the charger 2100 supports wireless power transmission according to the Qi standard and the A4WP standard, when the receiver 2200 can receive the wireless power according to the PMA standard, the charger 2100 may be configured as the receiver 2200. It may be determined that it is not compatible.

The charger 2100 assigns a power ID (WPT-ID) to the receiver 2200 when it is compatible, and transmits a power network configuration message including the power ID to the receiver 2200. The receiver 2200 may recognize its own power ID based on the received power network configuration message, and transmit a confirmation message to the charger 2100.

Meanwhile, when the charger 2100 is not compatible, the charger 2100 may transmit a message indicating that the receiver 2200 is not compatible, and the receiver 2200 may transmit an acknowledgment message to the charger 2100. Incompatible receiver 2200 will not be able to receive power transmission in the subsequent wireless power transfer step (S140).

Specifically, a method of setting a power network will be described with reference to FIG. 9. 9 is a detailed flowchart of a step of configuring a charging network in a wireless power transmission and reception method according to an embodiment of the present invention.

Referring to FIG. 9, the charger 2100 transmits a first device profile request message to the first receiver 2200a. In response, the first receiver 2200a may transmit a first device profile response message including information about the device profile of the first receiver 2200a. The charger 2100 may determine compatibility based on whether the wireless power transmission standard method of the first receiver 2200a corresponds to a standard supported by the charger 2100 based on the device profile of the first receiver 2200a. If compatible, the charger 2100 may allocate the first power ID WPT ID-1 to the first receiver 2200a and transmit a message including the power ID to the first receiver 2200a. The first receiver 2200a may receive the message, set the first power ID WPT ID-1 as its power ID, and transmit a confirmation message to the charger 2100.

When the power ID setting of the first receiver 2200a is finished, the charger 2100 transmits a second device profile request message to the second receiver 2200b, and the second receiver 2200b responds with its own device profile. The second device response message including a may be transmitted to the charger 2100. The charger 2100 determines the compatibility of the wireless power transmission of the second receiver 2200b with reference to the device profile, and allocates a second power ID WPT ID-2 to the second receiver 2200b if there is compatibility. Then, a message including the same may be transmitted to the second receiver 2200b. The second receiver 2200b may receive the message, set the second power ID WPT ID-2 as its power ID, and transmit a confirmation message to the charger 2100.

Here, the message used to configure the power network may be implemented in a message format defined in the standard used by the receiver 2200 for each receiver 2200 corresponding to the message. Since the charger 2100 may determine which standard each receiver 2200 uses in the search phase of the receiver 2200, the charger 2100 may determine a format of a message to be transmitted and received with each receiver 2200 based on the standard. have.

For example, the first device profile message may be provided as a signal of a frequency band and a carrier according to the first standard, and the second device profile message may be provided as a signal of a frequency band and a carrier according to the second standard. The same applies to the other messages used in step S130.

As a result, the power network may be set by determining compatibility with each receiver 2200 and assigning a power ID based on the compatibility determination.

Meanwhile, in operation S130, it may be determined which receiver 2200 is a message transmitted / received using a predetermined communication ID such as a header of a message between the charger 2100 and the receivers 2200. For example, the communication ID COM-1 of the first receiver 2200a is included in a header of the first device profile request message, and the first receiver 2200a of the receivers 2200 identifies the corresponding message. It may be determined whether the message is sent to the target.

When the setting of the power network is completed, the charger 2100 may set a power transmission / reception mode (S140).

The charger 2100 may set a power transfer mode. The power transmission / reception mode may include a single mode and a multi mode. Here, the multi-mode may include a simultaneous mode, a time division mode, and a time division simultaneous mode.

For example, the charger 2100 considers the number of receivers 2200 to which a power ID is assigned, the power transmission / reception mode supported by the receiver 2200, and the information included in the standard and other device profiles used by the receiver 2200. Power transmission and reception mode can be selected.

If there is only one receiver 2200 in the power network, a single mode may be selected as the power transmission / reception mode. On the contrary, if there are a plurality of receivers 2200 in the power network, the multi-mode may be selected as the power transmission / reception mode.

In the multi-mode, the time division mode may be selected when there is a receiver 2200 using different wireless power transmission / reception standards in the power network. Here, a time division multiple access (TDMA) scheme divides a power transmission interval into a plurality of time slots, allocates the receiver 2200 to each time slot, and transmits power to the receiver 2200 allocated during each time slot. In addition, the unassigned receiver 2200 disconnects power between the receiving antenna 1210 and the power receiving module 1220 or clocks the receiving antenna 1210 to block power reception.

If there are different receivers 2200 according to different standards, the frequency bands of magnetic fields used are different. Therefore, time division is performed for each standard to transmit wireless power according to one standard scheme in one time slot, and in another time slot. Since the wireless power must be transmitted and received according to another standard method, a time division method may be selected. Meanwhile, at this time, there may be a plurality of receivers 2200 using one standard method. In this case, the corresponding time slot is divided into smaller sub time slots, and power is transmitted for each sub time slot allocated to each receiver 2200. It is also possible to simultaneously charge a plurality of receivers 2200 corresponding to the standard during a time slot allocated to the standard method or received.

On the other hand, when the receiver 2200 in the power network uses the same standard, one of a time division mode and a simultaneous mode may be variably selected as the power transmission mode. If the standard supports only one of the time division mode or the simultaneous mode, the power transmission mode may be selected as the supported mode.

As such, the charger 2100 may select a power transmission mode according to the number of receivers 2200 in the power network or the number of standard schemes of the receivers 2200, where each receiver 2200 has a mode not supported. The mode must not be selected.

When the power transmission mode setting is finished, wireless power may be transmitted and received according to the selected mode (S150).

The charger 2100 may transmit a wireless power transfer request message to the receivers 2200. The receiver 2200 may transmit a wireless power transfer response message in response thereto. The charger 2100 primarily calculates an amount of power, a voltage, a current, and the like to be transmitted to the receiver 2200 based on the wireless power transmission request message or the response message.

Next, the charger 2200 may transmit a message including the information on the power transmission mode to the receiver 2200. The message includes information on time slot division for a power transmission interval and information on a receiver 2200 allocated to each time slot, as well as information on which mode of power transmission mode to perform power transmission. can do. The receiver 2200 may determine a power transmission mode by receiving a message, and determine which time slot is allocated when the power transmission interval is time-divided. Accordingly, the receiver 2200 may be activated during the time slot period to which the receiver 2200 is allocated, and may be deactivated in the other period.

Next, the charger 2100 may transmit test power. The receiver 2200 receiving the test power may transmit a device status message including information on power, voltage, and current received by the test power to the charger 2100 in response thereto. The charger 2100 adjusts the transmitted power such as impedance matching, amplification ratio adjustment, etc. based on the device status message and transmits the power to the receiver 2200. During power transmission, the receiver 2200 periodically transmits a power value, a voltage value, a current value, and the like, to the charger 2100, and the charger 2100 may adjust the transmission power by reflecting this.

Finally, when the power transmission is completed, the charger 2100 transmits a message indicating the end of the power transmission to the receiver 2200 and finishes the power transmission.

Specifically, a method of transmitting power will be described with reference to FIGS. 10 to 12. 10 is a detailed flowchart illustrating steps of transmitting and receiving power in a wireless power transmission and reception method according to an embodiment of the present invention, and FIGS. 11 and 12 are wireless in the step of transmitting and receiving power in a wireless power transmission and reception method according to an embodiment of the present invention. The operation diagram of the power network.

Referring to FIG. 10, the charger 2100 may transmit a first power transmission request message to the first receiver 2200a. The first receiver 2200a may transmit a first power transmission response message to the charger 2100 in response thereto. The charger 2100 may adjust the transmission power to be performed for the first receiver 2200a based on the first power transmission response message. In addition, the charger 2100 may transmit a second power transmission request message to the second receiver 2200b. In response, the second receiver 2200b may transmit a second power transmission response message to the charger 2100. The charger 2100 may adjust the transmission power to be performed for the second receiver 2200b based on the second power transmission response message.

Next, the charger 2100 transmits a message including the information about the power transmission mode and the scheduling information to the first receiver 2200a. The scheduling information may be included when the time division mode is selected. The scheduling information may include information obtained by dividing a time slot and information indicating a time slot allocated by the first receiver 2200a. The first receiver 2200b may determine which time slot to activate based on this. Similarly, the charger 2100 transmits a message including the information about the power transmission mode and the scheduling information to the second receiver 2200b. The scheduling information may include information obtained by dividing a time slot and information indicating a time slot allocated by the second receiver 2200b.

After the charger 2100 transmits a message including the power transmission mode and the scheduling information to each receiver 2200, the charger 2100 starts power transmission for each receiver 2200.

For example, when the first receiver 2200a and the second receiver 2200b are devices conforming to different standards, the power transmission interval may be divided into time slots for each receiver 2200. First, the charger 2100 may transmit power to the first receiver 2200a in the first time slot, and the charger 2100 may transmit power to the second receiver 2200b in the second time slot. In this case, the first receiver 2200a may be activated during the first time slot allocated thereto and deactivated in the second time slot. In addition, the second receiver 2200b may be activated during the second time slot allocated thereto and deactivated in the first time slot.

When the first time slot starts, the charger 2100 transmits test power to the first receiver 2200a as shown in FIG. 11. Here, as shown in FIG. 11, the first receiver 2200a may be one or plural. In the case of a plurality of chargers, the charger 2100 may perform a simultaneous mode or a time division mode for a plurality of first receivers 2200a (a method of dividing a sub time slot and allocating a plurality of first receivers 2200a to each sub time slot). Wireless power can be transmitted. This is a method that may be applied to the second time slot when there are a plurality of second receivers 2200b.

The first receiver 2200a may feed back at least one of a power value, a voltage value, and a current value received in response to the test power to the charger 2100. The charger 2100 may perform transmission power or impedance matching based on the feedback value, and transmit the wireless power to the first receiver 2200a based on the feedback. While the wireless power is being transmitted, the first receiver 2200a may feed back information (voltage value, current value, etc.) about power periodically received, and the charger 2100 controls power transmitted accordingly and adjusts impedance. Can match. When the first time slot ends, the charger 2100 transmits a message indicating the end of the first time slot to the first receiver 2200a. Accordingly, the first receiver 2200a may confirm that the first time slot has ended and may be deactivated. In this case, a message indicating the end of the first time slot may be transmitted to the second receiver 2200b. Accordingly, the second receiver 2200a may confirm the end of the first time slot, prepare for the second time slot, and activate the second time slot.

When the second time slot starts, the charger 2100 transmits test power to the second receiver 2200b as shown in FIG. 12. The second receiver 2200b may feed back at least one of a power value, a voltage value, and a current value received in response to the test power to the charger 2100. The charger 2100 may perform transmission power or impedance matching based on the feedback value, and transmit the wireless power to the second receiver 2200b based on the feedback. While the wireless power is being transmitted, the second receiver 2200b may feed back information (voltage value, current value, etc.) about power periodically received, and the charger 2100 controls the power to be transmitted and impedance accordingly. Can be matched.

Meanwhile, the transmission of wireless power performed in the first time slot and the second time slot may be performed according to the first standard and the second standard, respectively. Specifically, the frequency band of the magnetic field of the wireless power transmitted during the first time slot and the frequency band of the magnetic field of the wireless power performed in the second time slot may be different, and power transmission is performed in a magnetic resonance method in one time slot. In another, power transmission may be performed according to an electromagnetic induction scheme. In other words, the magnetic field transmitted in the first time slot and the second time slot may differ in at least one of a frequency band and a transmission scheme thereof.

Feedback may also be performed in a manner according to the first standard and a manner according to the second standard, respectively. It is possible to feed back a current value in one time slot and a voltage value in another time slot. In another time slot, feedback may be performed in a magnetic field in-band communication scheme, and in another time slot, feedback may be performed in out-band communication. That is, the feedback of the first time slot and the second time slot may be different from at least one of a communication scheme such as a frequency band used, an in-band / out-band type, and a kind of information included in the feedback.

When the second time slot ends, wireless power transmission may end.

In the wireless power transmission and reception method according to the embodiment of the present invention described above, not all steps are necessary, the wireless power transmission and reception method may be performed including some or all of the above-described steps. In addition, the above-described embodiments of the wireless power transmission and reception method may be performed in combination with each other. In addition, the above-described steps are not necessarily performed in the order described, and it is also possible that the steps described later are performed before the steps described first.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention described above may be implemented separately or in combination with each other.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

[Description of the code]

1000: wireless power system

1100: wireless power transmitter

1110: power transfer module

1111: AC-DC converter

1112: frequency oscillator

1113: power amplifier

1114: impedance matcher

1120: transmission antenna

1125: communication antenna

1130: communication module

1131: in-band communication module

1132: out-band communication module

1140: controller

1200: wireless power receiver

1210: receiving antenna

1215: communication antenna

1220: power receiving module

1221: Impedance Matcher

1222: rectifier

1223: DC-DC converter

1224: battery

1230: communication module

1240: controller

2000: wireless power network

2100: wireless power network charger

2200: wireless power network receiver

Claims

A power transmission module for transmitting wireless power using any one of a magnetic field of a first frequency band and a magnetic field of a second frequency band different from the first frequency band;

A first communication module;

A second communication module; And

Transmitting a first magnetic field signal of the first frequency band through the power transmission module;

Detect a first response signal to the first magnetic field signal through the first communication module,

Searching for a first wireless power receiver that performs wireless power transmission and reception using the first frequency band based on whether the first response signal is received;

Transmitting a second magnetic field signal of the second frequency band through the power transmission module;

Detect a second response signal to the second magnetic field signal through the second communication module,

And a controller for searching for a second wireless power receiver for performing wireless power transmission and reception using the second frequency band based on whether the second response signal is received.
The method of claim 1,

The first communication module is an in-band communication module using a magnetic field of the first frequency band,

The second communication module is an in-band communication module using a magnetic field of the second frequency band.
The method of claim 1,

The first communication module is an in-band communication module using a magnetic field of the first frequency band,

The second communication module is an out-band communication module for performing communication using a communication carrier different from the magnetic field.
The method of claim 3, wherein

The second communication module is a wireless power transmission, which is a communication module which performs any one of Bluetooth, Zigbee, Wi-Fi, NFC, and RFID. Device.
The method of claim 1,

The controller, when the first response signal is received for a first predetermined time, determines that the first wireless power receiver exists within a wireless power transmission range, and determines the first response for the first predetermined time. If no signal is received, it is determined that the first wireless power receiver does not exist within the wireless power transmission range, and when the second response signal is received for a second predetermined time, the wireless power transmission range is within the wireless power transmission range. If it is determined that the second wireless power receiver exists, and if the second response signal is not received during the first predetermined time, it is determined that the second wireless power receiver does not exist within the wireless power transmission range. Wireless power transmission device.
The method of claim 1,

And the controller detects the first response signal for a first predetermined time after transmitting the first magnetic field signal, and transmits the second magnetic field signal when the first predetermined time elapses.
The method of claim 1,

When the first wireless power receiver and the second wireless power receiver are found, the controller allocates a first ID to the first wireless power receiver and assigns a second ID to the second wireless power transmitter. Wireless power transmission device.
The method of claim 7, wherein

The controller transmits a message including the first ID information to the first wireless power receiver through the first communication module, and transmits a message including the second ID information through the second communication module. A wireless power transmitter for transmitting to the second wireless power receiver.
Transmitting a first magnetic field signal of a first frequency band through a power transmission module that transmits wireless power using any one of a magnetic field of a first frequency band and a magnetic field of a second frequency band different from the first frequency band;

Sensing a first response signal to the first magnetic field signal through a first communication module;

Searching for a first wireless power receiver that performs wireless power transmission and reception using the first frequency band based on whether the first response signal is received;

Transmitting a second magnetic field signal of the second frequency band through the power transmission module;

Sensing a second response signal to the second magnetic field signal through the second communication module; And

And searching for a second wireless power receiver for performing wireless power transmission and reception using the second frequency band based on whether the second response signal is received.
The method of claim 9,

The first communication module is an in-band communication module using a magnetic field of the first frequency band,

The second communication module is an in-band communication module using a magnetic field of the second frequency band.
The method of claim 9,

The first communication module is an in-band communication module using a magnetic field of the first frequency band,

And the second communication module is an out-band communication module for performing communication using a communication carrier different from the magnetic field.
The method of claim 11, wherein

The second communication module is a wireless power transmission, which is a communication module which performs any one of Bluetooth, Zigbee, Wi-Fi, NFC, and RFID. Way.
The method of claim 9,

In the searching of the first wireless power receiver, when the first response signal is received for the first predetermined time, it is determined that the first wireless power receiver exists within a wireless power transmission range, When the first response signal is not received for a predetermined time, it is determined that the first wireless power receiver does not exist within the wireless power transmission range,

In the searching of the second wireless power receiver, when the second response signal is received for a second predetermined time, it is determined that the second wireless power receiver exists within a wireless power transmission range, and wherein And if the second response signal is not received for a predetermined time, determining that the second wireless power receiver does not exist within the wireless power transmission range.
The method of claim 9,

The detecting of the first response signal is performed for a first predetermined time after transmitting the first magnetic field signal.

The transmitting of the second magnetic field signal is performed when the first predetermined time elapses after transmitting the first magnetic field signal.
The method of claim 9,

When the first wireless power receiver and the second wireless power receiver are found, allocating a first ID to the first wireless power receiver and allocating a second ID to the second wireless power transmitter. Wireless power transmission method further comprising.
The method of claim 15,

Transmitting a message including the first ID information to the first wireless power receiver through the first communication module; and transmitting a message including the second ID information through the second communication module to the second wireless device. The step of transmitting to the power receiving device; Wireless power transmission method further comprising.