KR101601909B1 - Apparatus for receiving wireless power and method for receiving wireless power, method for transmitting information and method for receiving information - Google Patents

Abstract

The present invention provides a wireless power receiving method and apparatus for receiving power from a wireless power transmitting apparatus. The wireless power receiving method in a wireless power receiving apparatus for receiving power from a wireless power transmitting apparatus according to an embodiment of the present invention includes receiving a predetermined connecting signal for identifying the wireless power receiving apparatus from the wireless power transmitting apparatus And transmitting a response signal to the wireless power transmission apparatus in response to the connection signal; negotiating a power transmission condition with the wireless power transmission apparatus; and receiving the power according to the negotiated power transmission condition . ≪ / RTI > Therefore, the present invention is advantageous in that it can effectively receive wireless transmission power in a wireless power receiving apparatus.

Description

Technical Field [0001] The present invention relates to a wireless power receiving apparatus, a wireless power receiving method, an information transmitting method, and an information receiving method. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a wireless power receiving apparatus, a wireless power receiving method, an information transmitting method, and a information receiving method.

In the 1800s, electric motors and transformers using electromagnetic induction principles began to be used, and then radio waves and lasers were used to transmit the electric energy to the desired devices wirelessly. A method of transmitting electrical energy by radiating the same electromagnetic wave has also been attempted. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction. Until now, the wireless energy transmission method is magnetic induction, self resonance, and remote transmission technology using short wavelength radio frequency.

In recent years, among such wireless power transmission techniques, energy transmission using self resonance is widely used.

In the wireless power transmission system using self-resonance, since the electric signals formed on the transmission side and the reception side are wirelessly transmitted through the coil, the user can easily charge electronic devices such as portable devices.

Conventionally, a transmitting side receives status information on a receiving side through an electromagnetic induction method to perform power transmission, but a technique in which a transmitting side receives status information on a receiving side through a self-resonance method and performs power transmission The development is still small.

In addition, since the wireless power can be transmitted between the transmitting side and the receiving side in a self-resonant manner, knowing the status information of the transmitting side at the receiving side enables more efficient power transmission. Bi-directional communication is required.

A related patent document related thereto is Korean Patent Laid-Open Publication No. 10-2011-0062841.

It is an object of the present invention to provide a wireless power receiving apparatus that receives power from a wireless power transmitting apparatus and a method of receiving wireless power from the wireless power transmitting apparatus.

The present invention provides a wireless power receiving method and apparatus for receiving power from a wireless power transmitting apparatus.

The wireless power receiving method in a wireless power receiving apparatus for receiving power from a wireless power transmitting apparatus according to an embodiment of the present invention includes receiving a predetermined connecting signal for identifying the wireless power receiving apparatus from the wireless power transmitting apparatus And transmitting a response signal to the wireless power transmission apparatus in response to the connection signal; negotiating a power transmission condition with the wireless power transmission apparatus; and receiving the power according to the negotiated power transmission condition . ≪ / RTI >

Wherein negotiating the power transfer condition comprises receiving first state information of the wireless power transmission apparatus from the wireless power transmission apparatus and determining second state information based on state information of the wireless power transmission apparatus And transmitting the determined second state information to the wireless power transmission apparatus.

The present invention further provides a method of controlling a wireless power receiving apparatus, the method comprising the steps of: determining the second status information by further using the current charging information of the wireless power receiving apparatus, wherein the current charging information includes information on a current charging amount of the wireless power receiving apparatus, And may include at least one.

The second state information may include at least one of information on the amount of power required by the wireless power receiving apparatus, information on current charging amount of the wireless power receiving apparatus, and information on a charging amount change of the wireless power receiving apparatus have.

The first state information may include information on a maximum amount of power that can be transmitted by the wireless power transmission apparatus, information on the amount of power currently available by the wireless power transmission apparatus, identification information corresponding to the wireless power transmission apparatus, Information on the number of wireless power receiving apparatuses receiving power from the wireless power transmitting apparatus, identification information of the wireless power receiving apparatus receiving power from the wireless power transmitting apparatus, And priority information of the wireless power receiving apparatus being powered by the wireless power transmission apparatus.

Further, it is possible to negotiate the power transmission condition with the wireless power transmission apparatus through bidirectional short-range wireless communication.

Here, the bidirectional short-range wireless communication may be one of Bluetooth, Zig-bee, WLAN, and NFC.

The negotiating of the power transfer conditions may further include receiving a status list for a plurality of wireless power transmission devices including the wireless power transmission device and receiving a status list from the wireless power transmission device to receive the power based on the status list And transmitting a predetermined control signal including the selection result to the selected wireless power transmission apparatus.

A wireless power receiving apparatus for receiving power from a wireless power transmission apparatus according to another embodiment of the present invention includes a receiving unit for receiving a connection signal for identifying the wireless power receiving apparatus from the wireless power transmission apparatus, And a negotiating unit for negotiating a power transmission condition with the wireless power transmission apparatus, wherein the negotiation unit transmits the response signal including the identification information of the wireless power reception apparatus in response to the negotiated power transmission condition, Lt; / RTI >

Wherein the negotiation section receives the first status information of the wireless power transmission apparatus from the wireless power transmission apparatus, determines second status information based on the first status information of the wireless power transmission apparatus, State information to the wireless power transmission apparatus.

The negotiating unit further determines the second state information by further using the current charging information of the wireless power receiving apparatus, and the current charging information includes information on a current charging amount of the wireless power receiving apparatus, a charging amount of the wireless power receiving apparatus, And information about the information about the user.

 The second status information may include at least one of information on the amount of power required by the wireless power receiving apparatus, information on current charging amount of the wireless power receiving apparatus, and information on the charging amount change of the wireless power receiving apparatus have.

The first state information may include at least one of a maximum power amount information that can be transmitted by the wireless power transmission apparatus, a current amount of power information available by the wireless power transmission apparatus, identification information corresponding to the wireless power transmission apparatus, And the wireless power receiving apparatus receives the power from the wireless power transmitting apparatus. The wireless power receiving apparatus receives information about the number of wireless power receiving apparatuses receiving power from the wireless power transmitting apparatus, And the priority information of the wireless power receiving apparatus being powered by the wireless power transmission apparatus.

Further, it is possible to negotiate the power transmission condition with the wireless power transmission apparatus through bidirectional short-range wireless communication.

Here, the bidirectional short-range wireless communication may be one of Bluetooth, Zig-bee, WLAN, and NFC.

The negotiating unit may further include a status list for a plurality of wireless power transmission apparatuses including the wireless power transmission apparatus, selecting a wireless power transmission apparatus to receive the power based on the status list, And transmit the predetermined control signal to the selected wireless power transmission apparatus.

Further, it is possible to receive the power from the wireless power transmission apparatus using the reception resonant coil.

The present invention is advantageous in that active and optimized wireless power transmission and wireless power reception are possible by sharing state information through a bidirectional local communication channel between a wireless power transmission apparatus and a wireless power reception apparatus.

1 shows a wireless power transmission system according to an embodiment of the present invention.
2 is an equivalent circuit diagram of a transmission induction coil according to an embodiment of the present invention.
3 is an equivalent circuit of a power source and a transmitter according to an embodiment of the present invention.
4 shows an equivalent circuit of a receiving resonant coil, a receiving induction coil, a smoothing circuit and a load according to an embodiment of the present invention.
5 is a block diagram of a wireless power transmission apparatus and a wireless power reception apparatus according to an embodiment of the present invention.
6 is a flowchart of a wireless power transmission method according to an embodiment of the present invention.
7 is a flowchart of a wireless power transmission method according to an embodiment of the present invention.
8 is a transition diagram of a wireless power transmission method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be easily understood by those skilled in the art.

1 shows a wireless power transmission system according to an embodiment of the present invention.

The power generated by the power source 100 is transmitted to the wireless power transmission apparatus 200 and is transmitted to the wireless power receiving apparatus 300 having the same resonance frequency value that resonates with the wireless power transmitting apparatus 200 by self- ).

More specifically, the power source 100 is an AC power source providing AC power at a predetermined frequency.

The wireless power transmission apparatus 200 includes a transmission induction coil 210 and a transmission resonance coil 220. The transmission induction coil 210 is connected to the power source 100, and alternating current flows. When an alternating current flows in the transmission induction coil 210, an alternating current is also induced in the transmission resonance coil 220 that is physically spaced apart by electromagnetic induction. The power transmitted to the transmission resonant coil 220 is transmitted to the wireless power receiving apparatus 300 by self resonance.

Power can be transmitted by self resonance between two LC circuits whose impedance is matched. The power transmission by the self resonance has an advantage in that the degree of freedom of position and distance between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 is increased as compared with the power transmission by electromagnetic induction.

 The wireless power receiving apparatus 300 includes a receiving resonant coil 310, a receiving induction coil 320, a rectifying circuit 330, and a load 340. The power transmitted by the transmission resonance coil 220 is received by the reception resonance coil 310 and an AC current flows through the reception resonance coil 310. [ The power transmitted to the reception resonance coil 310 is transmitted to the reception induction coil 320 by electromagnetic induction. The power delivered to the reception induction coil 320 is rectified through the rectifier circuit 330 and delivered to the load 340.

2 is an equivalent circuit diagram of a transmission induction coil 210 according to an embodiment of the present invention. As shown in FIG. 2, the transmission induction coil 210 may be formed of an inductor L1 and a capacitor C1, thereby constituting a circuit having an appropriate inductance and a capacitance value. The capacitor C1 may be a variable capacitor, and an impedance matching may be performed by adjusting the variable capacitor. The equivalent circuits of the transmission resonant coil 220, the reception resonant coil 310, and the reception induction coil 320 may be the same as those shown in Fig.

3 is an equivalent circuit of a power source 100 and a wireless power transmission device 200, in accordance with an embodiment of the present invention. 3, the transmission induction coil 210 and the transmission resonance coil 220 may include inductors L1 and L2 and capacitors C1 and C2 having a predetermined inductance value and a capacitance value, respectively.

4 shows an equivalent circuit of the receiving resonant coil 310, the receiving induction coil 320, the smoothing circuit 330 and the load 340 according to an embodiment of the present invention.

4, the reception resonant coil 310 and the reception induction coil 320 may include inductors L3 and L4 and capacitors C3 and C4 having a predetermined inductance value and a capacitance value, respectively. The smoothing circuit 330 may include a diode D1 and a smoothing capacitor C5. The smoothing circuit 330 converts AC power into DC power and outputs the AC power. The load 340 is indicated by a direct current power supply of 1.3 V, but may be any rechargeable battery or device requiring direct current power.

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

The wireless power transmission apparatus 200 may include a transmitting unit 230, an identifying unit 240, a negotiating unit 250, and a control unit 260. Further, it may further include the transmission induction coil 210 and the transmission resonance coil 220 shown in FIG.

The wireless power receiving apparatus 300 may include a receiving unit 350, a response signal transmitting unit 360, a negotiating unit 370, and a control unit 380. Further, it may further include the reception resonant coil 310, the reception induction coil 320, the rectification circuit 330, and the load 340 shown in FIG.

The transmitting unit 230 transmits a connection signal to the receiving unit 350. In one embodiment, the connection signal may refer to a power signal for detecting and identifying the wireless power receiving device 300. The transmitting unit 230 may periodically transmit a connection signal to detect the wireless power receiving apparatus 300.

The identification unit 240 receives the response signal to the connection signal and identifies the wireless power receiving apparatus 300. If the identification unit 240 does not receive a response signal to the connection signal, it stops transmitting the connection signal to the wireless power receiving apparatus 300. The case where the identification unit 240 does not receive a response signal in one embodiment is a case where a connection signal is transmitted to an object other than an object capable of power transmission such as a key or a coin, .

Negotiation section 250 negotiates with wireless power receiving apparatus 300 identified for power transmission and controller 260 causes power to be transmitted to the identified wireless power receiving apparatus according to the negotiated result.

The negotiating unit 250 transmits the status information of the wireless power transmitting apparatus 200 to the identified wireless power receiving apparatus 300 so that the identified wireless power receiving apparatus 300 transmits the status information of the wireless power transmitting apparatus 200 And receives the determined specific status information from the identified wireless power receiving apparatus 300. [0050]

In one embodiment, the status information of the wireless power transmission apparatus 200 includes information on the maximum amount of power that can be supplied by the wireless power transmission apparatus 200, information on the wireless power reception apparatus 300 provided by the wireless power transmission apparatus 200, And the identification information for the wireless power transmission apparatus 200. The wireless power transmission apparatus 200 may be a wireless communication apparatus.

In one embodiment, the status information of the wireless power receiving apparatus 300 may include information on the current charging amount or the charging amount transition of the wireless power receiving apparatus 300.

The negotiating unit 250 receives the status information of the identified wireless power receiving apparatus 300 and determines specific status information within the status information of the identified wireless power receiving apparatus 300. The control unit 260 transmits specific status information To transmit to the identified wireless power receiving apparatus 300 the power corresponding to the received power.

The negotiating unit 250 transmits an amount of available power to the identified wireless power receiving apparatus 300 so that the identified wireless power receiving apparatus 300 can determine the required amount of power within the available power amount range. Thereafter, when the wireless power receiving apparatus 300 determines the required power amount, the negotiating unit 250 receives the requested power amount. The control unit 260 transmits the power corresponding to the requested power amount to the wireless power receiving apparatus 300.

Through the above-described process, the state of the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 can be grasped and active power transmission can be performed.

The wireless power receiving apparatus 300 may include a receiving unit 350, a response signal transmitting unit 360, a negotiating unit 370, and a control unit 380. Further, it may further include the reception resonant coil 310, the reception induction coil 320, the rectification circuit 330, and the load 340 shown in FIG.

The receiving unit 350 receives a connection signal for identifying the wireless power receiving apparatus 300.

The response signal transmission unit 360 transmits a response signal to the wireless power transmission apparatus in response to the connection signal.

The negotiating unit 370 negotiates with the wireless power transmitting apparatus 200 for power transmission, and the control unit 380 causes the wireless power receiving apparatus 300 to receive power according to the negotiated result.

In one embodiment, the negotiator 370 receives status information of the wireless power transmission apparatus 200 and determines specific status information in the status information of the wireless power transmission apparatus 200, And the control unit 380 causes the wireless power transmission apparatus 200 to receive power corresponding to the specific state information.

Through the above-described process, the state of the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 can be grasped and active power transmission can be performed.

6 is a flowchart of a wireless power transmission method according to an embodiment of the present invention.

The wireless power transmission method of the present invention will be described by taking as an example wireless power transmission using self resonance, but it is also applicable to wireless power transmission by electromagnetic induction.

In one embodiment, the bi-directional communication of the present invention can be implemented through a configuration for varying the amount of current in the wireless power transmission apparatus 200 and the wireless power reception apparatus 300, for example, through In band communication using a variable resistor or a switch Do.

In an embodiment, the wireless power transmitting apparatus 200 and the wireless power receiving apparatus 300 may perform communication by adding a separate short-range wireless communication module such as Bluetooth, NFC, or ZigBee.

Referring to FIG. 6, the wireless power transmission apparatus 200 transmits a connection signal to the wireless power reception apparatus 300 (S101). In one embodiment, the connection signal may refer to a power signal for detecting and identifying the wireless power receiving device 300. The wireless power transmission apparatus 200 may periodically transmit a connection signal to detect the wireless power reception apparatus 300. [

The wireless power receiving apparatus 300 receives the connection signal and transmits a response signal to the wireless power transmitting apparatus 300. Thereafter, the wireless power transmission apparatus 200 receives the response signal for the connection signal and identifies the wireless power reception apparatus 300 (S103).

If the wireless power transmission apparatus 200 does not receive a response signal to the connection signal, the wireless power transmission apparatus 200 stops transmitting the connection signal to the wireless power reception apparatus 300. The case where the wireless power transmission apparatus 200 does not receive a response signal in one embodiment means that the wireless power transmission apparatus 200 does not receive a response signal by transmitting a connection signal to an object such as a key or a coin, .

When the wireless power transmission apparatus 200 has identified the wireless power reception apparatus 300, the wireless power transmission apparatus 200 enters a negotiation step of determining whether to transmit power to the identified wireless power reception apparatus 300 (S105).

If the negotiation between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 succeeds (S107), the wireless power transmission apparatus 200 transmits power to the identified wireless power reception apparatus 300 (S109 ).

The negotiation step S105 of determining whether to transmit the power to the identified wireless power receiving apparatus 300 may include transmitting the status information of the wireless power transmitting apparatus 200 to the identified wireless power receiving apparatus 300, Causing the wireless power receiving apparatus 300 to determine specific status information in the status information of the wireless power transmitting apparatus 300 and receiving the specific status information from the identified wireless power receiving apparatus 300 . ≪ / RTI >

One embodiment of steps S105 to S109 may include the following steps. The wireless power transmission apparatus 200 transmits an amount of available power to the identified wireless power receiving apparatus 300 so that the identified wireless power receiving apparatus 300 determines the amount of power required within the available power amount range. Thereafter, when the identified wireless power receiving apparatus 300 determines the required power amount, the wireless power transmitting apparatus 200 receives the required power amount. Thereafter, the wireless power transmitting apparatus 200 transmits the power corresponding to the required power amount to the identified wireless power receiving apparatus 300.

One embodiment of steps S105 to S109 may include the following steps.

The wireless power transmission apparatus 200 transmits to the identified wireless power reception apparatus 300 information on the priority that the wireless power transmission apparatus 200 provides power to the plurality of wireless power reception apparatuses, Thereby allowing the receiving device 300 to determine whether to accept a predetermined priority in the information about the priority. Then, when the identified wireless power receiving apparatus 300 accepts the predetermined priority, the wireless power transmitting apparatus 200 transmits the power according to the predetermined priority.

One embodiment of steps S105 to S109 may include the following steps.

The wireless power transmission apparatus 200 may be composed of a plurality of wireless power transmission apparatuses. The plurality of wireless power transmission apparatuses 200 transmit the identification information of the plurality of wireless power transmission apparatuses 200 to the identified wireless power reception apparatus 300 and the identified wireless power reception apparatus 300 transmits a plurality of wireless power And determines which one of the transmission apparatuses 200 is to be determined. Thereafter, when the identified wireless power receiving apparatus 300 selects a specific wireless power transmitting apparatus 200, the wireless power transmitting apparatus 200 receives the selection request signal. Thereafter, the selected wireless power transmission apparatus 200 transmits power to the identified wireless power reception apparatus 300.

In one embodiment, the negotiating step may refer to requesting status information of the wireless power receiving apparatus and transmitting the status information of the wireless power transmitting apparatus corresponding to the request to the wireless power receiving apparatus.

In one embodiment, the negotiating step may determine whether to transmit power using state information held between the wireless power transmitting apparatus 200 and the wireless power receiving apparatus 300.

In one embodiment, the status information of the wireless power transmission apparatus 200 may refer to information on the number of the wireless power reception apparatuses 300 to which the wireless power transmission apparatus 200 is providing power.

In one embodiment, the status information of the wireless power transmission apparatus 200 may be transmitted to the wireless power receiving apparatus 300 through which the specific wireless power transmitting apparatus 200 provides power when the unique identification number is assigned to each wireless power receiving apparatus 300 300 may be information on the unique identification number of the mobile terminal.

In one embodiment, the status information of the wireless power transmission apparatus 200 may be information on the amount of power being provided to the wireless power reception apparatus 300.

In one embodiment, the status information of the wireless power transmission apparatus 200 may include information on the priority for providing power to each wireless power receiving apparatus 300 in providing power to the plurality of wireless power receiving apparatuses 300 . ≪ / RTI >

In one embodiment, the state information of the wireless power transmission apparatus 200 includes information on a differential power provision ratio provided to each wireless power reception apparatus 300 in providing power to the wireless power reception apparatuses 300 . ≪ / RTI > For example, if a particular wireless power transmission apparatus 200 is providing power to three wireless power transmission apparatuses 300, the wireless power transmission apparatuses 300 may be differentially distributed at a rate of 50%, 30%, 20% 300) to provide power to the user.

In one embodiment, the status information of the wireless power receiving apparatus 300 may be information on the current charging amount or the charging amount transition of the wireless power receiving apparatus 300.

In one embodiment, the status information of the wireless power receiving apparatus 300 may mean information on which wireless power receiving apparatus 300 is receiving power from the wireless power transmitting apparatus 200. That is, it may mean the identification information for the wireless power transmission apparatus to which power is supplied.

If the negotiation between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 succeeds (S107), the wireless power transmission apparatus 200 transmits power to the identified wireless power reception apparatus 300 (S109 ).

In the power transmission process, if the state of the wireless power transmission apparatus 200 is changed (S111), the process returns to the negotiation step S105 or the power transmission is stopped.

In one embodiment, when the state of the wireless power transmission apparatus 200 is changed, it may mean information on a change in the amount of power that the wireless power transmission apparatus 200 can supply. In this case, when the amount of power that the wireless power transmitting apparatus 200 can provide due to an external factor decreases, the wireless power transmitting apparatus 200 stops providing power, enters the negotiation step S105, Negotiates to adjust the amount of power transmission between the apparatus 200 and the wireless power receiving apparatus 300. Thereafter, if the negotiation is successful according to the adjusted amount of power transmission, the power transmission is performed, and if not, the negotiation step S105 is entered again. If power supply to the wireless power transmission apparatus 200 is cut off or charging of the wireless power reception apparatus 300 is completed, the power transmission is terminated.

In a case where the state of the wireless power transmission apparatus 200 is changed in one embodiment, it means information about a change in the number of the wireless power reception apparatuses 300 that are providing power to one wireless power transmission apparatus 200 .

In the power transmission process, if the state of the wireless power receiving apparatus 300 is changed (S113), the process returns to the negotiation step S105, or the power transmission is stopped.

In one embodiment, when the state of the wireless power receiving apparatus 300 is changed, it may mean that a new wireless power receiving apparatus 300 is detected.

7 is a flowchart of a wireless power transmission method according to an embodiment of the present invention.

Referring to FIG. 7, the wireless power transmission apparatus 200 transmits a status list of the wireless power transmission apparatus 200 to the wireless power reception apparatus 300 (S201). The status list of the wireless power transmission apparatus 200 shows the status information of the wireless power transmission apparatus 200 and indicates the maximum amount of power that the wireless power transmission apparatus 200 can transmit, The number of providing wireless power receiving apparatuses 300 and the amount of available power of the wireless power transmitting apparatus 200. Table 1 explains in more detail.

Wireless power transmitter
(Identifier) Wireless power transmitter
Status information Maximum power supply Wireless power
Receiving device
Count Available power The wireless power transmission device (A) 100W 4 20W The wireless power transmission device (B) 200W 5 15W The wireless power transmission device (C) 300W 6 30W

In Table 1, the maximum power supply amount of the wireless power transmitting apparatus A is 100 W, and power is supplied to the four wireless power receiving apparatuses 300. In addition, each wireless power transmission apparatus A means that an available power amount of 20 W remains. Here, the amount of available power may be an amount of power that can be provided to a wireless power receiving apparatus other than a plurality of wireless power receiving apparatuses currently provided by the wireless power transmitting apparatus 200. The required power amount of each of the six wireless power receiving apparatuses 300 provided by the wireless power transmitting apparatus C is not limited to a constant amount of power but may be different.

The amount of available power of each wireless power transmission apparatus 300 may be different for each wireless power transmission apparatus 200. In this case, status information on the amount of available power for each wireless power transmission apparatus 200 may be transmitted.

The maximum power supply amount of the wireless power transmitting apparatus B is 200 W, and power is supplied to the five wireless power receiving apparatuses 300. The amount of available power of the wireless power transmitting apparatus B is 15W. The required power amount of each of the six wireless power receiving apparatuses 300 provided by the wireless power transmitting apparatus C is not limited to a constant amount of power but may be different.

The maximum power supply amount of the wireless power transmitting apparatus C is 300 W, and power is supplied to the six wireless power receiving apparatuses 300. In addition, the available power amount of the wireless power transmission apparatus C is 30W. The required power amount of each of the six wireless power receiving apparatuses 300 provided by the wireless power transmitting apparatus C is not limited to a constant amount of power but may be different.

The wireless power transmission apparatus 200 transmits the state list as shown in Table 1, and the wireless power reception apparatus 300 receives the list.

Thereafter, the wireless power receiving apparatus 300 transmits a request signal to the wireless power transmitting apparatus 200 to receive the list of one or more wireless power transmitting apparatuses 200 (S203). At this time, the wireless power receiving apparatus 300 can transmit a signal requesting the list of the wireless power transmitting apparatus A and requests the list of the wireless power transmitting apparatus A and the wireless power transmitting apparatus B And transmit a signal requesting a list of wireless power transmission apparatus A and wireless power transmission apparatus C, but the present invention is not limited thereto.

The wireless power transmission apparatus 200 may transmit a response signal corresponding to the request signal of the wireless power reception apparatus 300. [ In one embodiment, the response signal may be a signal rejecting the request signal. In one embodiment, when the wireless power receiving apparatus 300 transmits a signal requesting a list of the wireless power transmitting apparatus A and the wireless power transmitting apparatus B, the response signal is transmitted to the wireless power transmitting apparatus C Quot; list "

The wireless power transmission apparatus 200 and the wireless power reception apparatus 300 can perform active power transmission according to their respective states through bidirectional communication.

8 is a transition diagram of a wireless power transmission method according to an embodiment of the present invention.

- First mode (optional)

First, the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 are in the first mode M1. In one embodiment, the first mode M1 may be a selection mode. In one embodiment, the first mode M1 may be a state in which the wireless power transmission apparatus 200 does not generate a power signal. Here, the power signal may refer to a magnetic field transmitted to the reception induction coil of the wireless power receiving apparatus 300.

In one embodiment, the first mode M1 may be a state in which the wireless power transmission apparatus 200 removes the power signal. In one embodiment, the first mode M1 may be a state in which the wireless power transmission apparatus 200 monitors the presence and placement of the wireless power receiving apparatus 200. [

- Second mode (connection)

When the wireless power transmission apparatus 200 detects the wireless power reception apparatus 300 in the first mode M1, the wireless power transmission apparatus 200 transits to the second mode M2 for transmitting power to the wireless power reception apparatus 300. [ That is, when the wireless power transmission apparatus 200 recognizes the presence of the wireless power reception apparatus 300, the wireless power transmission apparatus 200 generates a power signal and transitions to the second mode M2.

In one embodiment, the second mode M2 may be a connected mode. In one embodiment, the second mode M2 may be in a basic ready state for performing communication between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300. [

In the second mode M2, the wireless power transmission apparatus 200 transmits a connection signal to the wireless power reception apparatus 300. [ The connection signal may refer to a power signal for detecting and identifying the wireless power receiving apparatus 300. If the wireless power transmission apparatus 200 fails to receive a response signal for the connection signal from the wireless power reception apparatus 300, the wireless power transmission apparatus 200 stops transmitting the connection signal and transitions to the first mode M1. If the wireless power transmission apparatus 200 receives a response signal indicating that the load (or battery) 340 of the wireless power reception apparatus 300 is sufficiently charged from the wireless power reception apparatus 300, The device 300 ends the power transmission.

In the second mode M2, when the wireless power transmission apparatus 200 receives a response signal requesting power transmission from the wireless power reception apparatus 300, the wireless power transmission apparatus 300 transmits an additional connection signal to the new wireless power Can be transmitted to the receiving apparatus (300). The additional connection signal may refer to a signal for detecting the new wireless power receiving apparatus 300.

When there is no response signal corresponding to the additional connection signal of the wireless power transmission apparatus 200, the operation to detect the new wireless power reception apparatus 300 is stopped.

- Third mode (identification and setting)

When the wireless power transmission apparatus 200 detects the wireless power reception apparatus 300 in the second mode M2, a third mode M3 for collecting the identification information and the status information of the detected wireless power reception apparatus 300 ). In one embodiment, the third mode M3 may be an identification and setting mode. Here, the identification information of the wireless power receiving apparatus 300 may mean information such as the type, model, and model of the wireless power receiving apparatus 300, but is not limited thereto. The state information of the wireless power receiving apparatus 300 remains in the maximum power amount (or the maximum amount of charge), the load (or the battery) 340 that can provide the load (or the battery) 340 of the wireless power receiving apparatus 300 Current power amount, and the like. However, the present invention is not limited thereto. The wireless power transmission apparatus 200 uses the identification information and the status information of the wireless power reception apparatus 300 to generate a power transmission condition with the wireless power reception apparatus 300. [ The power transmission condition may mean a set of conditions of variables for characterizing power transmission from the wireless power transmission device 200 to the wireless power reception device 300. [

When the power transmission condition is restricted in the third mode M3, the mode shifts to the first mode M1. In one embodiment, the constraint on the power transmission condition may mean that the power transmission condition is not established. In one embodiment, a constraint on the power transmission condition may mean that an unexpected data packet is transmitted between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300. [ In one embodiment, the constraint on the power transmission condition may mean a situation such as a timeout. The timeout includes a case in which the power transmission is stopped after a certain period of time after the wireless power receiving apparatus 300 receiving the power is removed.

The wireless power transmission apparatus 200 transmits state information related to the wireless power receiving apparatuses 300 to the first mode M1 in a state where the power transmission conditions are restricted in the third mode M3, To the power receiving apparatus 300, and transit to the third mode M3 again. In one embodiment, the status information of the wireless power transmission apparatus 200 may refer to information on the number of the wireless power reception apparatuses 300 to which the wireless power transmission apparatus 200 is providing power.

In one embodiment, the status information of the wireless power transmission apparatus 200 may be transmitted to the wireless power receiving apparatus 300 through which the specific wireless power transmitting apparatus 200 provides power when the unique identification number is assigned to each wireless power receiving apparatus 300 300 may be information on the unique identification number of the mobile terminal.

In one embodiment, the status information of the wireless power transmission apparatus 200 may be information on the amount of power being provided to the wireless power reception apparatus 300.

In one embodiment, the state information of the wireless power transmission apparatus 200 means information on the priority for providing power to each wireless power reception apparatus 300 in providing power to the wireless power reception apparatuses 300 can do.

In one embodiment, the state information of the wireless power transmission apparatus 200 includes information on a differential power provision ratio provided to each wireless power reception apparatus 300 in providing power to the wireless power reception apparatuses 300 . ≪ / RTI > For example, if a particular wireless power transmission apparatus 200 is providing power to three wireless power transmission apparatuses 300, the wireless power transmission apparatuses 300 may be differentially distributed at a rate of 50%, 30%, 20% 300) to provide power to the user.

In the third mode M3, when the number of the wireless power receiving apparatuses 300 exceeds a specific number, the first mode M1 can be transited again. That is, when a specific wireless power transmitting apparatus 200 provides power to the five wireless power receiving apparatuses 300, if a new wireless power receiving apparatus 300 is detected, To the first mode (M1) so as not to transmit power to the first mode (M1).

- Fourth mode (power transmission)

When the power transmission condition is established in the third mode M3, the fourth mode M4 can be transited. In one embodiment, the fourth mode M4 may refer to a state in which the wireless power transmission apparatus 200 is transmitting power to the wireless power reception apparatus. In a fourth mode M4, the wireless power transmission apparatus 200 adjusts the current flowing in the coils according to the information received from the wireless power reception apparatus 300, and supplies power to the wireless power reception apparatus 300 Lt; / RTI >

If any one of the power transmission conditions is not established in the fourth mode M4, the wireless power transmission apparatus 200 stops transmission of power to the wireless power reception apparatus 300, . In one embodiment, the constraint on the power transmission condition may mean that the power transmission condition is not established. In one embodiment, a constraint on the power transmission condition may mean that an unexpected data packet is transmitted between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300. [ In one embodiment, the constraint on the power transmission condition may mean a situation such as a timeout. The timeout includes a case in which the power transmission is stopped after a certain period of time after the wireless power receiving apparatus 300 receiving the power is removed.

When the wireless power transmission apparatus 200 receives the response signal indicating that the load (or battery) 340 of the wireless power reception apparatus 300 is sufficiently charged from the wireless power reception apparatus 300 in the fourth mode M4 The wireless power transmission apparatus 300 ends the power transmission and transitions to the first mode M1.

If the state of the wireless power receiving apparatus 300 is changed in the fourth mode M4, the third mode M3 can be transited.

A case where the state of the wireless power receiving apparatus 300 is changed in the embodiment is that when the wireless power transmitting apparatus 200 is transmitting power to the wireless power receiving apparatus 300, Can be detected. In this case, the wireless power transmission system transitions from the fourth mode M4 to the third mode M3. Thereafter, the wireless power transmission apparatus 200 performs an operation for collecting the identification information and the status information of the wireless power receiving apparatus 300, and when the wireless power transmission condition is established, the wireless power transmission apparatus 200 returns to the fourth mode M4 Transit. If there is a restriction on the wireless power transmission condition, the mobile station transitions to the first mode (M1).

The case where the state of the wireless power receiving apparatus 300 is changed in an embodiment means that the wireless power transmitting apparatus 200 has exceeded the number of the wireless power receiving apparatuses 300 that can provide power and is able to transmit at least one new wireless power It may mean that the receiving apparatus 300 is detected. In this case, the wireless power transmission system transitions from the fourth mode M4 to the third mode M3. Thereafter, the wireless power transmitting apparatus 200 performs an operation for collecting the identification information and the status information of the wireless power receiving apparatus 300, and the wireless power transmitting apparatus 200 performs an operation for collecting the identification information and the status information of the wireless power receiving apparatus 300 In one wireless power receiving apparatus 300, a transition is made to the first mode M1.

- Fifth mode (power transmission and bi-directional communication)

In the fourth mode M4, the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 can transit to the fifth mode M5 to share information with each other.

In one embodiment, the fifth mode M5 may be a power transfer and a bi-directional communication mode. In an embodiment, the fifth mode M5 may be a mode of sharing information on the status of each of the wireless power transmission apparatus 200 and the wireless power reception apparatus 300 while performing power transmission.

In one embodiment, the information about the changed state may mean information such as the number of wireless power transmission apparatuses 200 being changed, the state in which the amount of power that can be supplied by the wireless power transmission apparatus 200 is changed, and the like.

In one embodiment, the changed status information of the wireless power transmission apparatus 200 may refer to information about a change in the number of the wireless power reception apparatuses 300 in which the wireless power transmission apparatus 200 is providing power .

The changed status information of the wireless power transmission apparatus 200 may be transmitted to the wireless power transmission apparatus 200 in a case where each unique identification number is assigned to each wireless power reception apparatus 300, May refer to a change in information about the unique identification number of the devices 300. [

In one embodiment, the changed state information of the wireless power transmission apparatus 200 may mean information on the amount of power that can be provided to the wireless power receiving apparatus 300 in the future.

In one embodiment, the changing status information of the wireless power transmission apparatus 200 may include information on priority to provide power to each wireless power receiving apparatus 300 in providing power to the wireless power receiving apparatuses 300. [ . ≪ / RTI >

In one embodiment, the changed status information of the wireless power transmission apparatus 200 may be used to provide power to the wireless power receiving apparatuses 300, May refer to information about the user. For example, if a particular wireless power transmission apparatus 200 is providing power to three wireless power transmission apparatuses 300, the wireless power transmission apparatuses 300 may be differentially distributed at a rate of 50%, 30%, 20% 300, and 30%, 50%, and 20% depending on the amount of charge of each wireless power receiving apparatus 300 in a state of supplying power to the wireless power receiving apparatuses 300.

When the power transmission condition is restricted in the fifth mode M5, the mode transits to the first mode M1. In one embodiment, the constraint on the power transmission condition may mean that the power transmission condition is incomplete. In one embodiment, a constraint on the power transmission condition may mean that an unexpected packet is transmitted between the wireless power transmission apparatus 200 and the wireless power reception apparatus 300. In one embodiment, the constraint on the power transmission condition may mean a situation such as a timeout. The timeout includes a case in which the power transmission is stopped after a certain period of time after the wireless power receiving apparatus 300 receiving the power is removed.

In the fifth mode M1, when the power transmission condition is changed to the first mode M1, the wireless power transmission apparatus 200 transmits status information related to the wireless power receiving apparatuses 300 to the wireless power receiving apparatus 300 To the device 300, and again to the fifth mode M5.

When the wireless power transmission apparatus 200 receives the response signal indicating that the load (or battery) 340 of the wireless power reception apparatus 300 is sufficiently charged from the wireless power reception apparatus 300 in the fifth mode M5 The wireless power transmission apparatus 300 ends the power transmission and transitions to the first mode M1.

If the state of the wireless power receiving apparatus 300 is changed in the fifth mode M5, the fourth mode M4 may be transited.

The case where the state of the wireless power receiving apparatus 300 is changed in one embodiment means that the wireless power transmitting apparatus 200 transmits power to the wireless power receiving apparatus 300, It may mean that the receiving apparatus 300 is detected.

In this case, the wireless power transmission system transitions from the fifth mode M5 to the fourth mode M4, after which the wireless power transmission apparatus 200 transmits the identification information and status information of the new wireless power reception apparatus 300 And when the wireless power transmission condition is established, transits to the fifth mode M5 again. If there is a restriction on the wireless power transmission condition, the mobile station transitions to the first mode (M1).

Although the wireless power transmission using self resonance is described as an example in the present embodiment, the wireless power transmission method, the wireless power reception method, and the power control method using the two-way communication of the present invention can be applied to other wireless power transmission Lt; / RTI >

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

100: Power source
200: Wireless power transmitting device
210: transmission induction coil
220: transmission resonance coil
230:
240:
250: negotiation department
260:
300: Wireless power receiving device
310: Receive resonant coil
320: reception induction coil
330: rectifier circuit
340: Load
350:
360: response signal transmission unit
370: negotiation department
380:

Claims (17)

A wireless power receiving method in a wireless power receiving apparatus that receives power from a wireless power transmitting apparatus,
Receiving a connection signal for identifying a wireless power receiving apparatus transmitted by the wireless power transmission apparatus;
Transmitting a response signal for the connection signal to the wireless power transmission apparatus;
Receiving, from the wireless power transmission apparatus, first transmission apparatus status information including information on a first available power amount in the wireless power transmission apparatus;
Transmitting first receiving apparatus state information including information on a first required power amount determined in the first available power amount to the wireless power transmitting apparatus; And
Receiving from the wireless power transmission apparatus power adjusted according to the first receiver status information
/ RTI > The method according to claim 1,
Receiving, from the wireless power transmission apparatus, second transmission apparatus status information including information on a second available power amount in the wireless power transmission apparatus; And
Transmitting second receiving apparatus state information including information on a second required power amount determined in the second available power amount to the wireless power transmitting apparatus
≪ / RTI > 3. The method of claim 2,
When the wireless power receiving apparatus is further receiving a power and the wireless power receiving apparatus is further sensed in the wireless power transmitting apparatus to change the first available power amount, the second transmitting apparatus state information is transmitted to the wireless power transmitting apparatus ≪ / RTI > The method according to claim 1,
The first receiver status information
Identification information for uniquely identifying the wireless power receiving apparatus; And
Information about a current charging state in the wireless power receiving apparatus
Wherein the current charging state includes at least one of information on completion of charging, information on a current charging amount, and information on a current charging amount change. The method according to claim 1,
The first transmitter status information
A maximum power amount information transmittable by the wireless power transmission apparatus;
Identification information corresponding to the wireless power transmission apparatus; And
Information about the number of wireless power receiving apparatuses receiving power from the wireless power transmitting apparatus
≪ / RTI > 6. The method of claim 5,
The first transmitter status information
Information on an amount of power to be provided to the wireless power receiving apparatus;
Information regarding a differential power providing ratio for each wireless power receiving apparatus being supplied with power from the wireless power transmitting apparatus; And
Information regarding a priority assigned to the wireless power receiving apparatus
≪ / RTI > The method according to claim 1,
Wherein the received power is received through a resonant frequency band, the response signal, the first transmitter status information, and the first receiver status information are transmitted / received through a specific frequency band different from the resonant frequency band,
Wherein the specific frequency band is a frequency band for bidirectional short range wireless communication. 8. The method of claim 7,
Receiving a state list for a plurality of wireless power transmission apparatuses including the wireless power transmission apparatus through the specific frequency band;
Selecting a wireless power transmission device to receive power based on the state list; And
Transmitting the selection result to the selected wireless power transmission apparatus through the specific frequency band
/ RTI > A wireless power receiving apparatus for receiving power from a wireless power transmission apparatus,
A receiving unit for receiving a connection signal for identifying a wireless power receiving apparatus to be transmitted by the wireless power transmission apparatus;
A transmitter for transmitting a response signal for the connection signal to the wireless power transmission apparatus; And
When the first transmitter status information including information on the first available power amount in the wireless power transmission apparatus is received, a first receiving apparatus status including information on a first required power amount determined in the first available power amount, Information to be transmitted to the wireless power transmission apparatus
Wherein the wireless power receiving apparatus receives the power adjusted according to the first receiving apparatus status information from the wireless power transmitting apparatus. 10. The method of claim 9,
The negotiating part
And information on the second required power amount determined in the second available power amount is included when the second transmission apparatus status information including information on the second available power amount in the radio power transmission apparatus is received from the radio power transmission apparatus And to transmit the second receiving apparatus status information to the wireless power transmitting apparatus. 11. The method of claim 10,
Wherein when the wireless power receiving apparatus is receiving power and a new wireless power receiving apparatus is additionally detected in the wireless power transmitting apparatus to change the first available power amount, And wherein the wireless power receiving device receives from the device. 10. The method of claim 9,
The first receiver status information
Identification information for uniquely identifying the wireless power receiving apparatus; And
Information about a current charging state in the wireless power receiving apparatus
Wherein the current charging state includes at least one of information on completion of charging, information on a current charging amount, and information on a current charging amount change. 10. The method of claim 9,
The first transmitter status information
A maximum power amount information transmittable by the wireless power transmission apparatus;
Identification information corresponding to the wireless power transmission apparatus; And
Information about the number of wireless power receiving apparatuses receiving power from the wireless power transmitting apparatus
Further comprising: an antenna for receiving the radio signal; 14. The method of claim 13,
The first transmitter status information
Information on an amount of power to be provided to the wireless power receiving apparatus;
Information regarding a differential power providing ratio for each wireless power receiving apparatus being supplied with power from the wireless power transmitting apparatus; And
Information regarding a priority assigned to the wireless power receiving apparatus
≪ / RTI > 10. The method of claim 9,
Wherein the received power is received through a resonant frequency band, the response signal, the first transmitter status information, and the first receiver status information are transmitted / received through a specific frequency band different from the resonant frequency band,
Wherein the specific frequency band is a frequency band for bidirectional short-range wireless communication. 16. The method of claim 15,
The negotiating part
Selecting a wireless power transmission apparatus to receive power based on the status list when receiving a status list for a plurality of wireless power transmission apparatuses including the wireless power transmission apparatus through the specific frequency band, To be transmitted to the selected wireless power transmission apparatus through the specific frequency band. delete

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