KR20140129897A - Apparatus and method for transmitting and receiving wireless power - Google Patents

Abstract

The present invention relates to an apparatus and a method for transmitting/receiving a wireless power, and more specifically, to an apparatus for transmitting/receiving a wireless power,which receives wireless power, charge a battery, and transmit the wireless power by using power of the charged battery, and a method for transmitting/receiving a wireless power. According to an aspect of the present invention, the apparatus for transmitting/receiving a wireless power comprises: an antenna which receives or transmits wireless power by using a magnetic field; a communications module which communicates with a wireless power reception device; a power reception module which receives the wireless power through the antenna; a battery which stores the wireless power received through the power reception module; a power transmission module which transmits the wireless power through the antenna by using the power stored in the battery; and a controller which receives a wireless power transmission request message from the wireless power reception device through the communications module, receives device information from the wireless power reception device through the communications module, determines whether to transmit the wireless power based on the device information, and transmits the wireless power to the wireless power reception device through the power transmission module according to the determination result.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmitting / receiving apparatus and a wireless power transmitting /

The present invention relates to a wireless power transmission / reception device and a wireless power transmission / reception method, and more particularly, to a wireless power transmission / reception device that receives wireless power to charge a battery, transmits wireless power using the power of the charged battery, Receiving method.

Wireless power transmission technology is a technology that transmits power wirelessly between a power source and an electronic device. For example, in the wireless power transmission technology, a mobile terminal such as a smart phone or a tablet can be charged wirelessly only by placing the mobile terminal on a wireless charging pad. Thus, It can provide more excellent mobility, convenience, and safety. In addition to the wireless charging of mobile terminals, wireless power transmission technology has been attracting attention as a substitute for the existing wired power transmission environment in various fields of home appliances, electric vehicles, medical, leisure, and robots.

Wireless power transmission technology can be categorized as a technology using electromagnetic wave radiation and a technology using electromagnetic induction phenomenon. Techniques using electromagnetic wave radiation have limitations in efficiency due to the radiation loss consumed in the air. Recently, Many techniques using electromagnetic induction phenomena have been studied.

The wireless power transmission technology using the electromagnetic induction phenomenon is divided into an inductive coupling method and a resonant magnetic coupling method.

In the electromagnetic induction method, energy is transmitted by using a current induced in a receiving coil due to a magnetic field generated in a transmitting coil in accordance with electromagnetic coupling between a transmitting coil and a receiving coil. Although the electromagnetic induction type wireless power transmission technology has advantages of high transmission efficiency, it has a disadvantage in that the power transmission distance is limited to several millimeters, and the positional freedom is extremely low due to sensitivity to matching between coils.

Magnetic resonance method was proposed by Professor Marin Solarovich of MIT in 2005. It uses the phenomenon that the magnetic field is concentrated at both the transmission side and the reception side by the magnetic field applied at the resonance frequency between the transmission side coil and the reception side coil, Transmission.

This magnetic resonance method is capable of transmitting energy from a relatively long distance of several tens of centimeters to several meters as compared with the electromagnetic induction method, and it is also possible to transmit electric power to a plurality of devices at the same time, thereby realizing true cord-free It is expected to be implemented as a wireless power transmission technology.

However, in such a wireless power transmission technique, there is a limitation in the power transmission distance in any of the methods, and in the absence of the wireless power transmission device, power transmission is impossible.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless power transmission / reception device and a wireless power transmission / reception method capable of wireless power transmission / reception between devices that receive wireless power and charge a battery.

It is to be understood that the present invention is not limited to the above-described embodiments and that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the following claims .

According to an aspect of the present invention, there is provided a wireless communication device including: an antenna for receiving or transmitting wireless power using a magnetic field; A communication module for performing communication with the wireless power receiving device; A power receiving module for receiving wireless power through the antenna; A battery for storing wireless power received through the power receiving module; A power transmitting module for transmitting wireless power through the antenna using a power stored in the battery; And receiving a wireless power transmission request message from the wireless power reception device through the communication module, receiving device information from the wireless power reception device through the communication module, and determining whether wireless power transmission is performed based on the device information And a controller for transmitting wireless power to the wireless power receiving apparatus through the power transmitting module according to the determination result.

According to another aspect of the present invention, there is provided a method of wireless power transmission, comprising: receiving a wireless power transmission request message from a wireless power reception apparatus; Receiving device information from the wireless power receiving device when the message is received; Determining whether wireless power transmission is performed based on the device information; And transmitting wireless power to the wireless power receiving apparatus using a magnetic field using a power stored in the battery according to the determination result.

It is to be understood that the solution of the problem of the present invention is not limited to the above-mentioned solution, and the solutions which are not mentioned can be clearly understood by those skilled in the art to which the present invention belongs There will be.

According to the present invention, it is possible to transmit and receive wireless power between devices that receive wireless power and charge a battery, thereby sharing power between devices when there is no wireless power transmission device.

According to the present invention, one wireless power receiving apparatus can transmit wireless power to another wireless power receiving apparatus while receiving wireless power.

The effects of the present invention are not limited to the above-mentioned effects, and the effects not mentioned can 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 in accordance with 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 wireless power receiving apparatus according to an embodiment of the present invention.
4 is a block diagram of a wireless power transceiver according to an embodiment of the present invention.
5 is a flowchart of a first example of a wireless power transmission / reception method according to an embodiment of the present invention.
6 is a flowchart of a first example of a wireless power transmission / reception method according to an embodiment of the present invention.
7 is a diagram illustrating an operation in which wireless power transmission is performed in a transmission time slot in a first example of a wireless power transmission / reception method according to an embodiment of the present invention.
8 is a diagram illustrating an operation in which wireless power reception is performed in a reception time slot in a first example of a wireless power transmission / reception method according to an embodiment of the present invention.
9 is a flowchart of a second example of the wireless power transmission / reception method according to the embodiment of the present invention.
10 is a flowchart of a second example of a wireless power transmission / reception method according to an embodiment of the present invention.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to be illustrative of the present invention and not to limit the scope of the invention. Should be interpreted to include modifications or variations that do not depart from the spirit of the invention.

The terms and accompanying drawings used herein are for the purpose of facilitating the present invention and the shapes shown in the drawings are exaggerated for clarity of the present invention as necessary so that the present invention is not limited thereto And are not intended to be limited by the terms and drawings.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

According to an aspect of the present invention, there is provided a wireless communication device including: an antenna for receiving or transmitting wireless power using a magnetic field; A communication module for performing communication with the wireless power receiving device; A power receiving module for receiving wireless power through the antenna; A battery for storing wireless power received through the power receiving module; A power transmitting module for transmitting wireless power through the antenna using a power stored in the battery; And receiving a wireless power transmission request message from the wireless power reception device through the communication module, receiving device information from the wireless power reception device through the communication module, and determining whether wireless power transmission is performed based on the device information And a controller for transmitting wireless power to the wireless power receiving apparatus through the power transmitting module according to the determination result.

The controller may determine whether or not the wireless power is transmitted based on the first battery state information about the battery and the second battery state information about the battery of the wireless power receiving apparatus included in the device information.

The controller is further configured to transmit test power via the power transmission module and to receive feedback information regarding the power received at the wireless power transmission apparatus according to the test power from the wireless power reception apparatus through the communication module, It is possible to determine whether or not the wireless power is transmitted by further considering the received feedback information.

The feedback information may include information about at least one of a power value, a forward value, and a current value of the wireless power received by the wireless power receiving apparatus.

The controller periodically detects the amount of power of the battery of the wireless power transmission / reception device to update the first battery state information, and determines whether the wireless power transmission is continued based on the updated first battery state information have.

The controller periodically receives the second battery status information changed by the wireless power transmission from the wireless power receiving apparatus during the wireless power transmission through the communication module, and transmits the second battery status information based on the changed second battery status information Thereby determining whether the wireless power transmission is continued or not.

The controller periodically receives the second battery status information changed by the wireless power transmission from the wireless power receiving apparatus during the wireless power transmission through the communication module, and controls the power amount of the battery of the wireless power transmission / Periodically detects the first battery state information, updates the first battery state information, and determines whether the wireless power transmission is continued based on the updated first battery state information and the changed second battery state information.

According to another aspect of the present invention, there is provided a method of wireless power transmission, comprising: receiving a wireless power transmission request message from a wireless power reception apparatus; Receiving device information from the wireless power receiving device when the message is received; Determining whether wireless power transmission is performed based on the device information; And transmitting wireless power to the wireless power receiving apparatus using a magnetic field using a power stored in the battery according to the determination result.

In the determining, it is possible to determine whether or not to transmit the wireless power based on the first battery state information about the battery and the second battery state information about the battery of the wireless power receiving apparatus included in the device information.

Transmitting test power to the wireless power receiving apparatus using a magnetic field; And receiving feedback information regarding power received at the wireless power transmission apparatus from the wireless power receiving apparatus in accordance with the test power, wherein, in the determining step, the received feedback information is further considered It is possible to determine whether or not the wireless power is transmitted.

The feedback information may include information about at least one of a power value, a forward value, and a current value of the wireless power received by the wireless power receiving apparatus.

Periodically detecting an amount of power of the battery of the wireless power transmission / reception device and updating the first battery state information; And determining whether to continue the wireless power transmission based on the updated first battery state information.

Receiving the second battery state information changed by wireless power transmission periodically from the wireless power receiving apparatus while performing wireless power transmission; And determining whether to continue the wireless power transmission based on the changed second battery status information.

Receiving the second battery status information changed by wireless power transmission periodically from the wireless power receiving apparatus while performing wireless power transmission through the communication module; Periodically detecting a power amount of the battery of the wireless power transmission / reception device and updating the first battery state information; And determining whether to continue the wireless power transmission based on the updated first battery state information and the changed second battery state information.

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

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

1 is a block diagram of a wireless power system 1000 in accordance with an embodiment of the present invention.

Referring to FIG. 1, a wireless power system 1000 includes a wireless power transmission device 1100, a wireless power receiving device 1200, and a wireless power transmitting and receiving device 1300. The wireless power transmission apparatus 1100 receives power from an external power source S and generates a magnetic field. The wireless power receiving apparatus 1200 generates a current using the generated magnetic field and receives power wirelessly. The wireless power transceiver 1300 may receive power wirelessly using a magnetic field generated similarly to the wireless power receiver 1200. [ The wireless power transmission / reception device 1300 may generate a magnetic field similarly to the wireless power transmission device 1100. [ At this time, the wireless power transmitting / receiving device 1300 may generate a magnetic field using the power stored in the battery instead of the external power.

1, power is transmitted from the wireless power transmission apparatus 1100 to the wireless power transmission / reception apparatus 130 in the wireless power system 1000, and the wireless power transmission / Lt; RTI ID = 0.0 > 1200. ≪ / RTI >

Also, in the wireless power system 1000, the wireless power transmission apparatus 1100, the wireless power reception apparatus 1200, and the wireless power transmission / reception apparatus 1300 can transmit / receive various information required for wireless power transmission. Communication between the wireless power transmission apparatus 1100, the wireless power reception apparatus 1200, and the wireless power transmission / reception apparatus 1300 may be performed using an in-band communication using a magnetic field used for wireless power transmission, May be performed according to any one of out-band communication using a communication carrier.

Here, the wireless power transmission apparatus 1100 may be provided as a fixed type or a mobile type. Examples of the stationary type include a form embedded in a ceiling of a room, a wall surface or a table, an outdoor parking lot, a form installed in an implant type such as a bus stop or a subway station, or a form installed in a vehicle such as a vehicle or a train . The mobile wireless power transmission device 1100 may be implemented as part of another device, such as a portable device of movable weight or size, or a cover of a notebook computer.

In addition, the wireless power receiving apparatus 1200 and the wireless power transmitting / receiving apparatus 1300 should be interpreted as a comprehensive concept including various electronic apparatuses including a battery and various home appliances that are powered by wireless power instead of a power cable. Representative examples of the wireless power receiving apparatus 1200 include a portable terminal, a cellular phone, a smart phone, a personal digital assistant (PDA), a portable media player (PMP) Portable electronic devices, portable media players, wibro terminals, tablets, pablets, notebooks, digital cameras, navigation terminals, televisions, and electronic vehicles (EVs).

In the wireless power system 1000, the wireless power receiving apparatus 1200 and the wireless power transmitting / receiving apparatus 1300 may be one or more. 1, a wireless power transmission apparatus 1100, a wireless power reception apparatus 1200, and a wireless power transmission / reception apparatus 1300 are shown to transmit / receive power one to one. However, since one wireless power transmission apparatus 1100 includes a plurality of It is also possible to transmit power to the wireless power receiving apparatus 1200 or a plurality of wireless power transmitting / receiving apparatuses 1200. Particularly, in the case of performing wireless power transmission by a magnetic resonance method, one wireless power transmission apparatus 1100 can simultaneously apply a simultaneous transmission scheme or a time division transmission scheme to a plurality of wireless power receiving apparatuses 1200 and a wireless power transmitting / 1300). ≪ / RTI >

1, a wireless power transmission apparatus 1100 transmits power to a wireless power transmission / reception apparatus 1300, and a wireless power transmission / reception apparatus 1300 transmits power to a wireless power reception apparatus 1200 , It is also possible for the wireless power transmission apparatus 1100 to directly transmit power to the wireless power receiving apparatus 1200 or to both the wireless power receiving apparatus 1200 and the wireless power transmitting / receiving apparatus 1300.

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

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

The wireless power transmission apparatus 1100 can transmit power wirelessly.

2 is a block diagram of a wireless power transmission apparatus 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 transmission module 1110 can generate transmission power using a power source applied from an external power source S. The power transmission 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 can convert AC power into DC power. The AC-DC converter 1111 receives AC power from an external power source S and converts the waveform of the inputted AC power into DC power and outputs the DC power. The AC-DC converter 1111 can adjust the voltage value of the output DC power.

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

The power amplifier 1113 can amplify the voltage or current of the power. The power amplifier 1113 receives the AC power of a specific frequency output from the frequency oscillator 1112 and amplifies the voltage or current of the input AC power of the specific frequency and outputs the amplified voltage.

The impedance matcher 1114 can perform impedance matching. The impedance matcher 1114 may include a capacitor, an inductor, and a switching element for switching the connection thereof. The matching of the impedances is performed by detecting a reflected wave of the radio power transmitted through the transmission antenna 1120 and switching the switching element based on the detected reflected wave to adjust the connection state of the capacitor or the inductor or to adjust the capacitance of the capacitor, . ≪ / RTI >

Transmit antenna 1120 can generate an electromagnetic field using AC power. The transmission antenna 1120 receives the AC power of a specific frequency output from the power amplifier 1113 and can generate a magnetic field of a specific frequency. The generated magnetic field is radiated, which is received by the wireless power receiving apparatus 1200 to generate a current. In other words, the transmission antenna 1120 transmits power wirelessly.

Although not shown in FIG. 2, the wireless power transmission apparatus 1100 may further include a communication antenna. The communication antenna can transmit and receive a communication signal using a communication carrier other than the magnetic field communication. For example, the communication antenna can transmit and receive communication signals such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

The communication module 1130 can exchange information with the wireless power receiving apparatus 1200 or the wireless power transmitting / receiving apparatus 1300. Communication module 1130 may include at least one of an in-band communication module or an out-band communication module.

The in-band communication module can 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 transmitting information through a transmission antenna 1120 or by receiving a magnetic wave containing information through a transmission antenna 1120 . At this time, a modulation scheme such as binary phase shift keying (BPSK) or amplitude shift keying (ASK) and a Manchester coding or non-return-to-zero (NZR-L) level coding can be used to hold information in magnetic waves or to interpret magnetic waves containing information. With this in-band communication, the communication module 1130 can transmit and receive information up to several meters in a data transmission rate of several kbps.

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

The controller 1140 may control the overall operation of the wireless power transmission apparatus 1100. The controller 1140 may perform arithmetic processing and processing of various information, and may control each component of the wireless power transmission apparatus 1100.

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

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

The wireless power receiving apparatus () can receive power wirelessly.

3 is a block diagram of a wireless power receiving apparatus 1200 according to an embodiment of the present invention.

3, the wireless power receiving apparatus 1200 may include a receiving antenna 1210, a power receiving module 1220, a communication module 1230, and a controller 1240.

The receiving antenna 1210 may receive the wireless power transmitted from the wireless power transmission apparatus 1100 or the wireless power transmission / reception apparatus 1300. [ The receive antenna 1210 may receive power using the magnetic field emitted by the transmit antenna 1120. Here, when the specific frequency is a resonance frequency, a magnetic resonance phenomenon occurs between the transmitting antenna 1120 and the receiving antenna 1210, so that power can be more efficiently transmitted.

The power receiving module 1220 can charge or operate 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 can adjust the impedance of the wireless power receiving apparatus 1200. The impedance matcher 1221 may be composed of a switching element that switches capacitors, inductors, and combinations thereof. The matching of the impedances can be performed by controlling the switching elements of the circuits constituting the impedance matcher 1221 based on the voltage value or the current value, the power value, the frequency value or the like of the received radio power.

The rectifier 1222 can rectify the received radio power and convert it from ac to dc. The rectifier 1222 can 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 or the like may be used.

The DC-DC converter 1223 can convert the rectified DC power voltage to a desired level and output it. When the voltage value of the DC power source rectified by 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 outputs the voltage value of the rectified DC power source Voltage.

The battery 1224 can store energy using power output from the DC-DC converter 1223. [ On the other hand, the battery 1224 is not necessarily included in the wireless power receiving apparatus 1200. For example, the battery may be provided in a detachable external configuration. As another example, the wireless power receiving apparatus 1200 may include driving means for driving various operations of the electronic device instead of the battery 1224. [

Although not shown in FIG. 3, the wireless power receiving apparatus 1200 may further include a communication antenna. The communication antenna can transmit and receive a communication signal using a communication carrier other than the magnetic field communication. For example, the communication antenna can transmit and receive communication signals such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

The communication module 1230 can exchange information with the wireless power transmission device 1200 or the wireless power transmission / reception device 1300. Communication module 1230 may include at least one of an in-band communication module or an out-band communication module.

The in-band communication module can 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 transmitting information through a receiving antenna 1210 or by receiving a magnetic wave containing information through a receiving antenna 1210 . At this time, a modulation scheme such as binary phase shift keying (BPSK) or amplitude shift keying (ASK) and a Manchester coding or non-return-to-zero (NZR-L) level coding can be used to hold information in magnetic waves or to interpret magnetic waves containing information. With this in-band communication, the communication module 1230 can transmit and receive information up to a distance of several meters at a data transmission rate of several kbps.

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

The controller 1240 can control the overall operation of the wireless power receiving apparatus 1200. [ The controller 1240 may perform arithmetic operation and processing of various information, and may control each component of the wireless power receiving apparatus 1200.

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

4 is a block diagram of a wireless power transceiver 1300 in accordance with an embodiment of the present invention.

4, the wireless power transmission / reception device 1300 may include a transmission / reception antenna 1310, a power reception module 1320, a power transmission module 1330, a communication module 1340, and a controller 1340.

The transmitting and receiving antenna 1310 may perform the role of the transmitting antenna 1120 of the wireless power transmission apparatus 1100 and the receiving antenna 1210 of the wireless power receiving apparatus 1200. That is, the transmission / reception antenna 1310 can receive the wireless power transmitted from the wireless power transmission apparatus 1100. Also, the transmission / reception antenna 1310 can generate an electromagnetic field using AC power. The generated magnetic field may then radiate to transmit power to the wireless power receiving apparatus 1200.

The power receiving module 1320 may be provided in the same or similar manner as the power receiving module 1220 of the wireless power receiving apparatus 1200. Power is received via transmit / receive antenna 1310, and power receiving module 1320 may store the received power in battery 1324. [

The power transmitting module 1330 may be provided in the same or similar manner as the power transmitting module 1110 of the wireless power transmitting apparatus 1100. The power transmitting module 1130 radiates a magnetic field through the transmitting antenna 1120 using the power applied from the external power source S while the power transmitting module 1330 radiates the external power source power S Instead of using the stored power from the battery 1324 of the power receiving module 1320. [ Meanwhile, since the power transmitting module 1330 uses the power stored in the battery 1324, it may not have a DC-DC converter.

The communication module 1340 may be provided in the same or similar manner as the communication module 1130 of the wireless power transmission apparatus 1100 or the communication module 1230 of the wireless power reception apparatus 1200.

The controller 1350 may control the overall operation of the wireless power transceiver 1300. The controller 1350 may perform arithmetic operation and processing of various information, and may control each component of the wireless power transmitting / receiving device 1300.

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

The wireless power is transmitted from the wireless power transmission apparatus 1100 to the wireless power receiving apparatus 1200 or the wireless power transmitting and receiving apparatus 1300 or transmitted from the wireless power transmitting and receiving apparatus 1300 to the wireless power receiving apparatus 1300 . The process of transmitting power from the wireless power transmission apparatus 1100 to the wireless power transmission / reception apparatus 1300 or the process of transmitting power from the wireless power transmission / reception apparatus 1300 to the wireless power reception apparatus 1200 is performed by the wireless power transmission apparatus 1100 The power is transmitted from the wireless power transmission apparatus 1100 to the wireless power receiving apparatus 1200. The wireless power receiving apparatus 1200 receives the power from the wireless power transmission apparatus 1100 and transmits the power to the wireless power receiving apparatus 1200. [

The wireless transmission of electric power can be performed using an electromagnetic induction method or a magnetic resonance method. At this time, it may be performed between the transmission antenna 1120 of the wireless power transmission apparatus 1100 and the reception antenna 1210 of the wireless power reception apparatus 1200.

When a magnetic resonance method is used, the transmitting antenna 1120 and the receiving antenna 1210 may be provided in the form of resonant antennas, 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. Also, the core may be disposed inside the loop. The core may comprise a physical core such as a ferrite core or an air core.

The transmission of energy between the transmitting antenna 1120 and the receiving antenna 1210 can be achieved through resonance of the magnetic field. The resonance phenomenon is a phenomenon in which, when one resonant antenna is located near another resonant antenna when a near-field corresponding to the resonant frequency is generated, both resonant antennas are coupled to each other, and high efficiency energy transfer occurs between the resonant antennas . When a magnetic field corresponding to a resonance frequency is generated between the resonant antenna of the transmission antenna 1120 and the resonant antenna of the reception antenna 1210, resonance phenomena in which the resonant antenna of the transmission antenna 1120 and the resonant antenna of the reception antenna 1210 resonate with each other The magnetic field is focused toward the receiving antenna 1210 at a higher efficiency than in the case where the magnetic field generated in the transmitting antenna 1120 is radiated to the free space in general. The energy can be transferred to the electrodes 1210 and 1210 with high efficiency.

The electromagnetic induction method can be implemented similarly to the magnetic resonance method, but the frequency of the magnetic field does not have to be the resonance frequency at this time. Instead, in the electromagnetic induction method, matching between the loops constituting the receiving antenna 1210 and the transmitting antenna 1120 is required and the intervals between the loops must be very close to each other.

Hereinafter, a method of transmitting / receiving a wireless power according to an embodiment of the present invention will be described. The wireless power transmission / reception method will be described using the wireless power system 1000 described above. However, the present invention is not limited to the wireless power transmission / reception method, and may be performed using another similar system.

First, a first example of a wireless power transmission / reception method according to an embodiment of the present invention will be described.

5 is a flowchart of a first example of a wireless power transmission / reception method according to an embodiment of the present invention.

5, a wireless power transmission / reception method includes receiving (S110) wireless power from a wireless power transmission apparatus 1100, receiving a wireless power transmission request from a wireless power reception apparatus 1200 (S120) (S140) of performing wireless power transmission / reception scheduling (S140), requesting the wireless power transmission apparatus 1100 to stop wireless power transmission (S150), transmitting scheduling information (S160) and performing wireless power transmission / reception in accordance with the scheduling (S170).

Hereinafter, each of the above-described steps will be described in detail with reference to FIG. 6 is a flowchart of a first example of a wireless power transmission / reception method according to an embodiment of the present invention.

Referring to FIG. 6, the wireless power transmission / reception apparatus 1300 can receive wireless power from the wireless power transmission apparatus 1100 (S110). The wireless power transmission apparatus 1100 can transmit wireless power in the form of a magnetic field through the transmission antenna 1120 using a power source applied from an external power source S. [ The wireless power transceiver 1300 may receive a magnetic field radiated from the wireless power transmission device 1120 to receive wireless power. The wireless power transmission between the wireless power transmission apparatus 1100 and the wireless power transmission / reception apparatus 1300 can be performed according to a magnetic resonance method or an electromagnetic induction method, which has been described above.

The wireless power transceiver 1300 may receive a wireless power transmission request from the wireless power receiving apparatus 1200 while receiving the wireless power (S120). Specifically, the communication module 1340 of the wireless power transmitting / receiving device 1300 may receive a message requesting wireless power transmission from the wireless power receiving device 1200. The request message may include a device profile for the wireless power receiving device 1200. Here, the device profile may include the device address of the wireless power receiving apparatus 1200, the battery state (the amount of power pertaining to a percentage of the charged state), the power value (charging voltage or charging current) for charging the battery, and the like.

The wireless power transceiver 1300 may determine whether the wireless power is transmitted (S130). The wireless power transceiver 1300 determines whether to transmit the wireless power to the wireless power receiving apparatus 1200 considering the current battery status and whether the wireless terminal is being charged and the device profile of the wireless power receiving apparatus 1200 requesting wireless power reception Can be determined. For example, when the battery value of the wireless power transmission / reception device 1300 is equal to or less than the first reference value, the wireless power transmission / reception device 1300 may determine that the wireless power transmission is not performed. Conversely, when the battery value of the wireless power transmission / reception device 1300 is equal to or greater than the first reference value, the wireless power transmission / reception device 1300 can determine that the wireless power transmission is not performed. For example, if the battery power of the wireless power transmitting / receiving device 1300 is greater than the battery power of the wireless power transmitting / receiving device 1300 and the wireless power receiving device 1200, wireless power transmission is performed, It may not be performed. In addition, when the wireless power transmission / reception device 1300 is receiving power from the wireless power transmission apparatus 1100, the first reference value may be set low, and if not, the first reference value may be set high.

The wireless power transmission / reception device 1300 determines whether or not the wireless power transmission is not limited to the above-described example, and may be determined by considering the device profile, whether or not the device profile itself is receiving power, .

If it is determined that the wireless power transmission / reception device 1300 transmits wireless power to the wireless power reception device 1200, wireless power transmission / reception scheduling may be performed (S140). Specifically, the wireless power transmission / reception scheduling divides a predetermined time unit into a transmission time slot and a reception time slot. The transmit timeslot is the time interval during which the wireless power transceiver 1300 transmits power to the wireless power receiver 1200 and the receive timeslot is the time interval during which the wireless power transceiver 1300 receives power from the wireless power transmitter 1100 It is time interval to receive. The relative length of the transmission time slot and the reception time slot may be set according to the battery state of the wireless power transmission / reception device 1300 and the wireless power reception device 1200.

For example, if the battery of the wireless power transmission / reception device 1300 is smaller in the amount of power or less in the amount of charge (percent) than the battery of the wireless power receiving device 1200, the reception time slot can be set longer than the transmission time slot. On the contrary, if the battery of the wireless power transmission / reception device 1300 is larger in the amount of power or the amount of charge (percent) than the battery of the wireless power receiving device 1200, the reception time slot can be set shorter than the transmission time slot. If the wireless power transceiver 1300 is in a fully charged state, it may be possible to omit the receiving timeslot. In addition, when the battery state of the wireless power transmission / reception device 1300 is extremely small, the transmission time slot can be omitted until the battery of the wireless power transmission / reception device 1300 is charged to a certain amount or more. On the contrary, if the battery of the wireless power transmission / reception device 1300 is higher than a certain level and the battery of the wireless power reception device 1200 is extremely low, the transmission time slot can be taken very short and taken in the reception time slot.

Meanwhile, the length and the ratio of the transmission / reception time slots can be dynamically adjusted when the battery state changes according to wireless power transmission / reception.

The wireless power transceiver 1300 may request the wireless power transmission apparatus 1100 to suspend the wireless power transmission (S150). If the wireless power transmission and reception apparatus 1300 determines to perform the wireless power transmission, The apparatus 1300 sends a message requesting the wireless power transmission apparatus 1100 to suspend the wireless power transmission, and the wireless power transmission apparatus 1100 receives the message requesting the suspension of the power transmission to stop the power transmission .

The wireless power transmission / reception device 1300 may also transmit scheduling information including information on the division of time slots to the wireless power transmission apparatus 1100 and the wireless power reception apparatus 1200. [

The wireless power transmission / reception device 1300 may perform wireless power transmission / reception according to the scheduling (S170). The transmission and reception of wireless power may be performed in a time division manner in the transmission time slot and the reception time slot.

7 is a diagram illustrating an operation in which wireless power transmission is performed in a transmission time slot in a first example of a wireless power transmission / reception method according to an embodiment of the present invention.

The wireless power transceiver 1300 may transmit wireless power during a transmission time slot based on the scheduling information as shown in FIG. At this time, the transmitted wireless power may be generated using the power stored in the battery 1334. The wireless power receiving apparatus 1200 can receive a magnetic field radiated from the wireless power transmitting / receiving apparatus 1300 during a transmission time slot based on the received scheduling information to charge the battery.

8 is a diagram illustrating an operation in which wireless power reception is performed in a reception time slot in a first example of a wireless power transmission / reception method according to an embodiment of the present invention.

The wireless power transmission apparatus 1100 may transmit wireless power during a reception time slot based on the received scheduling information as shown in FIG. The wireless power transceiver 1300 may receive a magnetic field radiated from the wireless power transmission device 1100 during a reception time slot to charge the battery.

As the transmission time slot and the reception time slot are alternately performed at regular intervals, the wireless power transmission / reception device 1300 receives power from the wireless power transmission device 1100 to charge the battery, 1200). ≪ / RTI >

7 and 8, when the wireless power receiving apparatus 1200 is outside the charging range of the wireless power transmission apparatus 1100, the wireless power transmitting / receiving apparatus 1300 functions as a kind of repeater, Thereby enabling wireless power transmission to the outside wireless power receiving apparatus 1200.

Next, a second example of the wireless power transmission / reception method according to the embodiment of the present invention will be described.

9 is a flowchart of a second example of the wireless power transmission / reception method according to the embodiment of the present invention.

9, the wireless power transmitting / receiving method includes receiving (S210) a wireless power transmission request from the wireless power receiving apparatus 1200, receiving (S220) device information from the wireless power receiving apparatus 1200, (S230) of transmitting test power and receiving feedback information (S230), determining whether to perform power transmission (S240), performing power transmission (S250), receiving the battery status information from the wireless power receiving apparatus 1200 (S260) and determining whether to continue power transmission based on the battery status information (S270).

Hereinafter, each of the above-described steps will be described in more detail with reference to FIG. 10 is a flowchart of a second example of a wireless power transmission / reception method according to an embodiment of the present invention.

Referring to FIG. 10, the wireless power transmission / reception device 1300 may receive a wireless power transmission request from the wireless power reception device 1200 (S210). Specifically, the communication module 1340 of the wireless power transmitting / receiving device 1300 may receive a message requesting wireless power transmission from the wireless power receiving device 1200. The request message may include a device profile related to the wireless power receiving apparatus 1200 (S220). Or the wireless power transceiver 1300 may receive a separate message for the device profile (device information) from the wireless power receiving device 1200. Here, the device profile may include the device address of the wireless power receiving apparatus 1200, the battery state (the amount of power pertaining to a percentage of the charged state), the power value (charging voltage or charging current) for charging the battery, and the like.

The wireless power transceiver 1300 may transmit test power and receive feedback information (S230). The wireless power transceiver 1300 may transmit a magnetic field signal having a test power. The wireless power receiving apparatus 1200 can receive this and transmit the feedback information to the wireless power transmitting / receiving apparatus 1300. The feedback information may include a voltage value, a current value, or a power value of the wireless power that the wireless power receiving apparatus 1200 receives and receives the test power.

The wireless power transceiver 1300 may determine whether to perform the wireless power transmission (S240). The wireless power transceiver 1300 may determine whether to transmit power to the wireless power receiving apparatus 1200 based on the device information and the feedback information. At this time, it is possible to further determine whether or not the power is transmitted by considering the battery state of the wireless power transmitting / receiving device 1300.

For example, when the wireless power transmission efficiency is equal to or less than a predetermined value according to the feedback information, that is, when the voltage value, the current value, or the power value is less than or equal to the reference value, it is determined that the wireless power transmission efficiency is low, . Conversely, when the wireless power transmission efficiency is equal to or greater than a fixed value according to the feedback information, wireless power transmission can be performed.

When the battery value of the wireless power transmission / reception device 1300 is equal to or less than the first reference value, the wireless power transmission / reception device 1300 can determine that the wireless power transmission is not performed. Conversely, when the battery value of the wireless power transmission / reception device 1300 is equal to or greater than the first reference value, the wireless power transmission / reception device 1300 can determine that the wireless power transmission is not performed. For example, if the battery power of the wireless power transmitting / receiving device 1300 is greater than the battery power of the wireless power transmitting / receiving device 1300 and the wireless power receiving device 1200, wireless power transmission is performed, It may not be performed.

The wireless power transmission / reception device 1300 determines whether or not the wireless power transmission is not limited to the above-described example, and may be determined by considering the device profile, whether or not the device profile itself is receiving power, .

If the wireless power transmitting / receiving device 1300 determines to transmit the wireless power, the wireless power transmitting / receiving device 1300 can transmit power to the wireless power receiving device 1200 (S250). The wireless power transceiver 1300 may transmit wireless power in the form of a magnetic field through the transmission / reception antenna 1310 using the power of the battery. The wireless power receiving apparatus 1200 may receive a magnetic field radiated from the wireless power transmission apparatus 1300 to receive wireless power. The wireless power transmission between the wireless power transmission / reception device 1300 and the wireless power reception device 1200 can be performed according to a magnetic resonance method or an electromagnetic induction method, which has been described above.

The wireless power transceiver 1300 may receive the battery status information from the wireless power receiving apparatus 1200 (S260). During wireless power transmission, the wireless power transceiver 1300 may periodically receive information regarding the battery status of the wireless power receiving apparatus 1200 from the wireless power receiving apparatus 1200.

The wireless power transceiver 1300 may determine whether to continue power transmission based on the battery condition (S270). The wireless power transceiver 13000 can determine whether to continue or terminate the wireless power transmission considering its own battery state and the battery state of the wireless power receiving apparatus 1200. By transmitting the wireless power, The battery of the wireless power receiving apparatus 1200 continuously increases and the battery of the apparatus 1300 continuously decreases and the battery of the wireless power receiving apparatus 1200 continuously increases so that the difference of the charging percentages of the batteries of both apparatuses 1300 and 1200 becomes less than a predetermined value, For example, whether the battery of the wireless power receiving apparatus 1200 has more power than the battery of the wireless power transmitting / receiving apparatus 1300. For example, when the battery of the wireless power receiving apparatus 1200 has more power than the battery of the wireless power transmitting / You can stop.

The wireless power transmission / reception method according to the embodiment of the present invention is not essential, so that the wireless power transmission / reception method may be performed including some or all of the above-described steps. Embodiments of the above-described wireless power transmission / reception method may also be performed in combination with each other. It is also to be understood that each of the above-described steps is not necessarily performed in the order described, and that the steps described later may be performed before the steps described earlier.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention described above can be implemented separately or in combination.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

1000: Wireless power system
1100: Wireless power transmission device
1110: Power transmission module
1111: AC-DC converter
1112: Frequency oscillator
1113: Power amplifier
1114: Impedance matching device
1120: Transit Centena
1130: Communication module
1140: Controller
1200: wireless power receiving device
1210: Receive antenna
1220: Power receiving module
1221: Impedance matcher
1222: Rectifier
1223: DC-DC converter
1224: Battery
1230: Communication module
1240: Controller
1300: Wireless power transmitter / receiver
1310: Transmitting / receiving antenna
1320: Power receiving module
1330: Power transmission module
1334: Battery
1340: Communication module
1350: Controller

Claims (14)

An antenna for receiving or transmitting wireless power using a magnetic field;
A communication module for performing communication with the wireless power receiving device;
A power receiving module for receiving wireless power through the antenna;
A battery for storing wireless power received through the power receiving module;
A power transmitting module for transmitting wireless power through the antenna using a power stored in the battery; And
Receives a wireless power transmission request message from the wireless power reception apparatus through the communication module, receives device information from the wireless power reception apparatus through the communication module, determines whether or not the wireless power transmission is performed based on the device information And a controller for transmitting wireless power to the wireless power receiving apparatus through the power transmitting module according to the determination result
Wireless power transceiver.
The method according to claim 1,
The controller determines whether or not to transmit the wireless power based on the first battery state information about the battery and the second battery state information about the battery of the wireless power receiving apparatus included in the device information
Wireless power transceiver.
The method according to claim 1,
Wherein the controller transmits test power via the power transmission module and receives feedback information on power received from the wireless power transmission apparatus according to the test power through the communication module from the wireless power reception apparatus, And further determines the transmission of the wireless power by considering the received feedback information
Wireless power transceiver.
The method of claim 3,
Wherein the feedback information includes at least one of a power value, a forward value, and a current value of the wireless power received by the wireless power receiving apparatus
Wireless power transceiver.
The method according to claim 1,
Wherein the controller periodically detects the amount of power of the battery of the wireless power transmitting / receiving device to update the first battery state information,
And determines whether the wireless power transmission is continued based on the updated first battery state information
Wireless power transceiver.
The method according to claim 1,
Wherein the controller periodically receives the second battery status information changed by wireless power transmission from the wireless power receiving apparatus while performing a wireless power transmission through the communication module,
And determines whether the wireless power transmission is continued based on the changed second battery state information
Wireless power transceiver.
The method according to claim 1,
Wherein the controller periodically receives the second battery status information changed by wireless power transmission from the wireless power receiving apparatus while performing a wireless power transmission through the communication module,
The wireless power transmission / reception device periodically detects the amount of power of the battery and updates the first battery status information,
And determines whether the wireless power transmission is continued based on the updated first battery state information and the changed second battery state information
Wireless power transceiver.
Receiving a wireless power transmission request message from a wireless power reception device;
Receiving device information from the wireless power receiving device when the message is received;
Determining whether wireless power transmission is performed based on the device information; And
And transmitting wireless power to the wireless power receiving apparatus using a magnetic field using a power stored in the battery according to the determination result
Wireless power transmission / reception method.
9. The method of claim 8,
In the determining, it is determined whether or not the wireless power is transmitted based on the first battery state information about the battery and the second battery state information about the battery of the wireless power receiving apparatus included in the device information
Wireless power transmission / reception method.
9. The method of claim 8,
Transmitting test power to the wireless power receiving apparatus using a magnetic field; And
Receiving feedback information on power received at the wireless power transmission apparatus from the wireless power reception apparatus in accordance with the test power,
In the determining, it is further determined whether to transmit the wireless power by considering the received feedback information
Wireless power transmission / reception method.
11. The method of claim 10,
Wherein the feedback information includes at least one of a power value, a forward value, and a current value of the wireless power received by the wireless power receiving apparatus
Wireless power transmission / reception method.
9. The method of claim 8,
Periodically detecting a power amount of the battery of the wireless power transmission / reception device and updating the first battery state information; And
And determining whether to continue the wireless power transmission based on the updated first battery state information
Wireless power transmission / reception method.
9. The method of claim 8,
Receiving the second battery state information changed by the wireless power transmission periodically from the wireless power receiving apparatus while performing the wireless power transmission; And
And determining whether to continue the wireless power transmission based on the changed second battery status information
Wireless power transmission / reception method.
9. The method of claim 8,
Receiving the second battery state information changed by wireless power transmission periodically from the wireless power receiving apparatus while performing wireless power transmission through the communication module;
Periodically detecting a power amount of the battery of the wireless power transmission / reception device and updating the first battery state information; And
And determining whether to continue the wireless power transmission based on the updated first battery state information and the changed second battery state information
Wireless power transmission / reception method.

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