KR20130051970A - Apparatus for transmmiting wireless power and apparatus for receiving wireless power and method for transmitting wireless power, method for receiving wireless power, method for transmitting information and method for receiving information - Google Patents

Abstract

PURPOSE: A wireless power transmission device, a wireless power receiving device, a wireless power transmission method, a wireless power receiving method, an information transmission method and an information receiving method are provided to perform the power transmission actively by transmitting the status information between the wireless power transmission device and the wireless power receiving device. CONSTITUTION: A wireless power transmission device(200) comprises a transmission unit(230), a distinguishing unit(240), a negotiation unit(250), and a control unit(260). A wireless power receiving device(300) comprises a receiving unit(350), an answer signal transmission unit(360), a negotiation unit(370), and a control unit(380). The transmission unit transmits a connect signal for distinguishing the wireless power receiving device in the receiving unit. The distinguishing unit receives the answer signal of the connect signal and distinguishes the wireless power receiving device. The negotiation unit negotiates with the distinguished wireless power receiving device for the power transmission. The control unit transmits the power to the distinguished wireless power receiving apparatus depending on a negotiated result. [Reference numerals] (230) Transmission unit; (240) Distinguishing unit; (250,370) Negotiation unit; (260,380) Control unit; (350) Receiving unit; (360) Answer signal transmission unit

Description

Wireless power transmitter, wireless power receiver, wireless power transmission method, wireless power reception method, information transmission method and information reception method POWER, METHOD FOR TRANSMITTING INFORMATION AND METHOD FOR RECEIVING INFORMATION}

The present invention relates to a wireless power transmitter, a wireless power receiver, a wireless power transmission method, a wireless power reception method, an information transmission method and an information reception 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. To date, energy transmission methods using wireless methods include magnetic induction, magnetic resonance, and long-distance transmission technology using short wavelength radio frequencies.

Recently, among the wireless power transmission technologies, energy transmission schemes using magnetic resonance have been widely used.

In the wireless power transmission system using magnetic resonance, the electric signals formed on the transmitting side and the receiving side are wirelessly transmitted through the coil, so that the user can easily charge an electronic device such as a portable device.

In the related art, the transmitting side receives the state information on the receiving side through the electromagnetic induction method and performs the power transmission. However, the technique in which the transmitting side receives the state information on the receiving side through the magnetic resonance method performs power transmission. There is still little development.

In addition, since the wireless power can be transmitted between the transmitting side and the receiving side by the self-resonant method, if the receiving side knows the status information of the transmitting side, more efficient power transmission is possible, thus sharing the state information between the transmitting side and the receiving side. Bidirectional communication is required.

As a related prior patent document there is Republic of Korea Patent Publication No. 10-2011-0062841.

The present invention relates to a wireless power transmitter, a wireless power receiver, a wireless power transmission method, a wireless power reception method, an information transmission method and information that actively transmits and receives status information between a wireless power transmitter and a wireless power receiver. It aims at providing a receiving method.

In accordance with another aspect of the present invention, there is provided a wireless power transmission method in which a wireless power transmitter transmits power to a wireless power receiver; Identifying the wireless power receiver by receiving a response signal to the connection signal; Negotiating for power transmission with the identified wireless power receiver; And transmitting power to the identified wireless power receiver according to the negotiated result.

In accordance with an aspect of the present invention, there is provided a wireless power receiving method in which a wireless power receiver receives power from a wireless power transmitter, the method comprising: receiving a connection signal for identifying the wireless power receiver; Transmitting a response signal to the connection signal to the wireless power transmitter; Negotiating power transmission with the wireless power transmitter; And receiving power from the wireless power transmitter according to the negotiated result.

An information transmission method for transmitting information to a wireless power receiver by a wireless power transmitter according to an embodiment of the present invention includes transmitting a plurality of status lists of the wireless power transmitter to the wireless power receiver; Receiving a request signal for requesting one or more status lists of the plurality of status lists; And transmitting a response signal corresponding to the request signal to the wireless power receiver.

An information receiving method for receiving information from a wireless power transmitter by a wireless power receiver according to an embodiment of the present invention includes: receiving a plurality of status lists of the wireless power transmitter from the wireless power receiver; Transmitting a request signal for requesting one or more status lists from the plurality of status lists to the wireless power transmitter; And receiving a response signal corresponding to the request signal from the wireless power transmitter.

A wireless power transmitter for transmitting power to a wireless power receiver according to an embodiment of the present invention includes a transmitter for transmitting a connection signal to the wireless power receiver; An identification unit for receiving the response signal to the connection signal to identify the wireless power receiver; A negotiating unit for negotiating power transmission with the identified wireless power receiver; And a controller configured to transmit power to the identified wireless power receiver according to the negotiated result.

In accordance with an aspect of the present invention, a wireless power receiver for receiving power from a wireless power transmitter includes a receiver configured to receive a connection signal for identifying the wireless power receiver; A response signal transmitter for transmitting a response signal to the connection signal to the wireless power transmitter; A negotiating unit for negotiating power transmission with the wireless power transmitter; And a controller configured to receive power from the wireless power receiver according to the negotiated result.

According to an embodiment of the present invention, active power transmission is possible by sharing state information between the wireless power transmitter and the wireless power receiver.

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 illustrates an equivalent circuit of a reception resonance coil, a reception 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 transmitter and a wireless power receiver according to an embodiment of the present invention.
6 is a flowchart illustrating a wireless power transmission method according to an embodiment of the present invention.
7 is a flowchart illustrating 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, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

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 transmitter 200, and resonates with the wireless power transmitter 200 by a magnetic resonance phenomenon, that is, the wireless power receiver 300 having the same resonance frequency value. Is delivered.

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

The wireless power transmitter 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 through the transmission induction coil 210, an alternating current is also induced in the transmission resonance coil 220 which is physically spaced by electromagnetic induction. Power transmitted to the transmission resonance coil 220 is transferred to the wireless power receiver 300 by magnetic resonance.

Power may be transferred by magnetic resonance between two impedance matched LC circuits. The power transmission by the magnetic resonance has an advantage of increasing the degree of freedom of position and distance between the wireless power transmitter 200 and the wireless power receiver 300 as compared to the power transmission by electromagnetic induction.

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

2 is an equivalent circuit diagram of a transmission induction coil 210, in accordance with an embodiment of the present invention. As shown in FIG. 2, the transmission induction coil 210 may be composed of an inductor L1 and a capacitor C1, thereby forming a circuit having appropriate inductance and capacitance values. The capacitor C1 may be a variable capacitor, and impedance matching may be performed by adjusting the variable capacitor. Equivalent circuit diagrams of the transmission resonant coil 220, the reception resonant coil 310, and the reception induction coil 320 may be the same as those illustrated in FIG. 2.

3 is an equivalent circuit of the power source 100 and the wireless power transmitter 200 according to an embodiment of the present invention. As illustrated in FIG. 3, the transmission induction coil 210 and the transmission resonant coil 220 may be formed of inductors L1 and L2 and capacitors C1 and C2 having predetermined inductance values and capacitance values, respectively.

4 illustrates equivalent circuits of the reception resonance coil 310, the reception induction coil 320, the smoothing circuit 330, and the load 340, according to an embodiment of the present invention.

As shown in FIG. 4, the reception resonance coil 310 and the reception induction coil 320 may be formed of inductors L3 and L4 and capacitors C3 and C4 having predetermined inductance values and capacitance values, respectively. The smoothing circuit 330 may be composed of a diode D1 and a smoothing capacitor C5, and converts AC power into DC power and outputs the DC power. The load 340 is represented by a 1.3V DC power source, but can be any rechargeable battery or device that requires DC power.

5 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

The wireless power transmitter 200 may include a transmitter 230, an identifier 240, a negotiator 250, and a controller 260. In addition, the transmission induction coil 210 and the transmission resonant coil 220 shown in FIG. 1 may be further included.

The wireless power receiver 300 may include a receiver 350, a response signal transmitter 360, a negotiator 370, and a controller 380. In addition, the reception resonance coil 310, the reception induction coil 320, the rectifier circuit 330, and the load 340 shown in FIG. 1 may be further included.

The transmitter 230 transmits a connection signal to the receiver 350. In one embodiment, the connection signal may mean a power signal for detecting and identifying the wireless power receiver 300. The transmitter 230 may periodically transmit a connection signal to detect the wireless power receiver 300.

The identification unit 240 identifies the wireless power receiver 300 by receiving a response signal to the connection signal. When the identification unit 240 does not receive a response signal for the connection signal, the transmission of the connection signal to the corresponding wireless power receiver 300 is stopped. In one embodiment, when the identification unit 240 does not receive a response signal, it is a case where the response signal is not received by transmitting a connection signal to an object other than an object capable of power transmission, for example, a key or a coin. Can be.

The negotiation unit 250 negotiates with the identified wireless power receiver 300 for power transmission, and the controller 260 transmits power to the identified wireless power receiver according to the negotiated result.

The negotiation unit 250 transmits the state information of the wireless power transmitter 200 to the identified wireless power receiver 300 so that the identified wireless power receiver 300 is the state information of the wireless power transmitter 200. To determine specific status information within, and receives the specific status information determined from the identified wireless power receiver 300.

In one embodiment, the state information of the wireless power transmitter 200 is information on the maximum amount of power that the wireless power transmitter 200 can supply, and the wireless power receiver 300 provided by the wireless power transmitter 200. It may include information about the number and identification information for the wireless power transmitter 200.

In one embodiment, the state information of the wireless power receiver 300 may include information on the current charging amount or the charging amount trend of the wireless power receiver 300.

The negotiation unit 250 receives the state information of the identified wireless power receiver 300 to determine specific state information within the state information of the identified wireless power receiver 300, and the controller 260 determines specific state information. To transmit the power corresponding to the identified wireless power receiver 300.

In one embodiment, the negotiation unit 250 transmits the available power to the identified wireless power receiver 300 so that the identified wireless power receiver 300 determines the required power within the available power range. Thereafter, when the wireless power receiver 300 determines the required power amount, the negotiation unit 250 receives the required power amount. The controller 260 transmits power corresponding to the required amount of power to the wireless power receiver 300.

Through the above process, it is possible to identify the states of the wireless power transmitter 200 and the wireless power receiver 300 to actively transmit power.

The wireless power receiver 300 may include a receiver 350, a response signal transmitter 360, a negotiator 370, and a controller 380. In addition, the reception resonance coil 310, the reception induction coil 320, the rectifier circuit 330, and the load 340 shown in FIG. 1 may be further included.

The receiver 350 receives a connection signal for identifying the wireless power receiver 300.

The response signal transmitter 360 transmits the response signal to the wireless power transmitter.

The negotiation unit 370 negotiates with the wireless power transmitter 200 for power transmission, and the controller 380 receives power from the wireless power receiver 300 according to the negotiated result.

In one embodiment, the negotiation unit 370 receives the state information of the wireless power transmitter 200 to determine specific state information within the state information of the wireless power transmitter 200, and the wireless power transmitter 200 The determined specific state information is transmitted to the controller 380, and the controller 380 receives power corresponding to the specific state information from the wireless power transmitter 200.

Through the above process, it is possible to identify the states of the wireless power transmitter 200 and the wireless power receiver 300 to actively transmit power.

6 is a flowchart illustrating 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 using wireless power transmission using magnetic resonance as an example, but can also be applied to wireless power transmission by electromagnetic induction.

In one embodiment of the present invention, the bidirectional communication may include a configuration for changing an amount of current in the wireless power transmitter 200 and the wireless power receiver 300, for example, through in-band communication using a variable resistor or a switch. It can be implemented.

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 transmitter 200 transmits a connection signal to the wireless power receiver 300 (S101). In one embodiment, the connection signal may mean a power signal for detecting and identifying the wireless power receiver 300. The wireless power transmitter 200 may periodically transmit a connection signal to detect the wireless power receiver 300.

The wireless power receiver 300 receives the connection signal and transmits a response signal to the wireless power transmitter 300. Thereafter, the wireless power transmitter 200 receives the response signal for the connection signal to identify the wireless power receiver 300 (S103).

If the wireless power transmitter 200 does not receive a response signal for the connection signal, the transmission of the connection signal to the corresponding wireless power receiver 300 is stopped. In one embodiment, when the wireless power transmitter 200 does not receive a response signal, the wireless power transmitter 200 does not receive a response signal by transmitting a connection signal to an object other than an object capable of transmitting power, for example, a key or a coin. It may be the case.

When the wireless power transmitter 200 identifies the wireless power receiver 300, the wireless power transmitter 200 enters a negotiation step of determining whether to transmit power to the identified wireless power receiver 300 (S105).

If the negotiation between the wireless power transmitter 200 and the wireless power receiver 300 succeeds (S107), the wireless power transmitter 200 transmits power to the identified wireless power receiver 300 (S109). ).

In the negotiation step S105 of determining whether to transmit power to the identified wireless power receiver 300, the identification information is transmitted by transmitting status information of the wireless power transmitter 200 to the identified wireless power receiver 300. Allowing the wireless power receiver 300 to determine specific state information within the state information of the wireless power transmitter 300 and receiving the specific state information from the identified wireless power receiver 300. It may include.

An embodiment of steps S105 to S109 may include the following process. The wireless power transmitter 200 transmits the available power amount to the identified wireless power receiver 300 so that the identified wireless power receiver 300 determines the required power amount within the available power range. Thereafter, when the identified wireless power receiver 300 determines the required power amount, the wireless power transmitter 200 receives the required power amount. Thereafter, the wireless power transmitter 200 transmits power corresponding to the required amount of power to the identified wireless power receiver 300.

An embodiment of steps S105 to S109 may include the following process.

The wireless power transmitter 200 transmits information on a priority of the wireless power transmitter 200 to provide power to the plurality of wireless power receivers to the identified wireless power receiver 300, and identifies the wireless power. The receiving device 300 determines whether to accept the predetermined priority in the information about the priority. Thereafter, when the identified wireless power receiver 300 receives a predetermined priority, the wireless power transmitter 200 transmits power according to the predetermined priority.

An embodiment of steps S105 to S109 may include the following process.

Wireless power transmitter 200 may be configured in plurality. The plurality of wireless power transmitters 200 transmits identification information of the plurality of wireless power transmitters 200 to the identified wireless power receiver 300, and the identified wireless power receiver 300 receives a plurality of wireless powers. Determining any one of the transmitter 200. Thereafter, when the identified wireless power receiver 300 selects a specific wireless power transmitter 200, the wireless power transmitter 200 receives a selection request signal. Thereafter, the selected wireless power transmitter 200 transmits power to the identified wireless power receiver 300.

In an embodiment, the negotiating step may mean requesting status information of the wireless power receiver, and transmitting status information of the wireless power transmitter corresponding to the request to the wireless power receiver.

In an embodiment, the negotiating step may mean determining whether to transmit power by using state information between the wireless power transmitter 200 and the wireless power receiver 300.

In one embodiment, the state information of the wireless power transmitter 200 may refer to information about the number of wireless power receivers 300 to which one wireless power transmitter 200 provides power.

In one embodiment, the state information of the wireless power transmitter 200 is provided with a unique identification number for each wireless power receiver 300, the wireless power receiver 200 provides power to the specific wireless power transmitter 200 ( Information about the unique identification number of the 300 may be meant.

In one embodiment, the state information of the wireless power transmitter 200 may mean information on the amount of power provided to the wireless power receiver 300.

In one embodiment, the state information of the wireless power transmitter 200 is information on a priority of providing power to each wireless power receiver 300 in providing power to the plurality of wireless power receivers 300. It may mean.

In one embodiment, the state information of the wireless power transmitter 200 is information on the differential power providing ratio provided to each wireless power receiver 300 in providing power to the wireless power receiver 300. It may mean. For example, when a specific wireless power transmitter 200 is providing power to the three wireless power transmitters 300, the wireless power receiver differentially (50%, 30%, 20%) The information that is providing power to the 300.

In one embodiment, the state information of the wireless power receiver 300 may be information on the current charging amount or the charging amount trend of the wireless power receiver 300.

In one embodiment, the state information of the wireless power receiver 300 may refer to information on which wireless power transmitter 200 receives the power from the wireless power receiver 300. That is, it may mean identification information of the wireless power transmitter receiving power.

If the negotiation between the wireless power transmitter 200 and the wireless power receiver 300 succeeds (S107), the wireless power transmitter 200 transmits power to the identified wireless power receiver 300 (S109). ).

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

In an embodiment, when the state of the wireless power transmitter 200 is changed, it may mean information about a change in the amount of power that the wireless power transmitter 200 can supply. In this case, when the amount of power that can be provided by the wireless power transmitter 200 decreases due to external factors, the wireless power transmitter 200 stops providing power and enters a negotiation step S105 to transmit wireless power. The apparatus 200 and the wireless power receiver 300 negotiate power transmission amounts. Then, if the negotiation is successful according to the adjusted power transmission amount, the power transmission is made, otherwise enters the negotiation step (S105) 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 one embodiment, when the state of the wireless power transmitter 200 is changed, information about the number of wireless power receivers 300 providing power to one wireless power transmitter 200 is changed. Can be.

In the power transmission process, if the state of the wireless power receiver 300 is changed (S113), return to the negotiation step (S105), or stop the power transmission.

In one embodiment, when the state of the wireless power receiver 300 is changed, it may mean a case where a new wireless power receiver 300 is detected.

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

Referring to FIG. 7, first, the wireless power transmitter 200 transmits a state list of the wireless power transmitter 200 to the wireless power receiver 300 (S201). The state list of the wireless power transmitter 200 indicates state information of the wireless power transmitter 200, and the maximum amount of power that the wireless power transmitter 200 can transmit, and the wireless power transmitter 200 transmits power. It may include the number of wireless power receiver 300 provided and the amount of available power of the wireless power transmitter 200. Table 1 explains this in more detail.

Wireless power transmitter
(Identification symbol) Wireless power transmitter
Status Information Power supply Wireless power
Receiver
Count Available power amount Wireless power transmitter (A) 100W 4 20W Wireless power transmitter (B) 200W 5 15 W Wireless power transmitter (C) 300 W 6 30 W

In Table 1, the maximum power supply amount of the wireless power transmitter A is 100W, and supplies power to the four wireless power receivers 300. In addition, each wireless power transmitter (A) means that the amount of available power of 20W remains. Here, the available power amount may mean an amount of power that can be provided to other wireless power receivers in addition to the plurality of wireless power receivers currently provided by the wireless power transmitter 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 available power amount of each wireless power transmitter 300 may be different for each wireless power transmitter 200, and in this case, state information on the available power amount for each wireless power transmitter 200 may be transmitted.

The maximum power supply amount of the wireless power transmitter B is 200W, and supplies power to five wireless power receivers 300. In addition, the available power amount of the wireless power transmitter 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 transmitter C is 300W, and power is supplied to six wireless power receivers 300. In addition, the available power amount of the wireless power transmitter C is 30W. The required power amount of each of the six wireless power receivers 300 provided by the wireless power transmitter C is not limited to a constant power amount, and may be different.

The wireless power transmitter 200 transmits a status list as shown in Table 1, and the wireless power receiver 300 receives it.

Thereafter, the wireless power receiver 300 transmits a request signal for receiving a list of one or more wireless power transmitters 200 to the wireless power transmitter 200 (S203). In this case, the wireless power receiver 300 may transmit a signal requesting a list for the wireless power transmitter A, and request a list for the wireless power transmitter A and the wireless power transmitter B. A signal may be transmitted, and a signal for requesting a list for the wireless power transmitter A and the wireless power transmitter C may be transmitted, but is not limited thereto.

The wireless power transmitter 200 may transmit a response signal corresponding to the request signal of the wireless power receiver 300. In one embodiment, the response signal may be a signal for rejecting the request signal. In one embodiment, when the wireless power receiver 300 transmits a signal requesting a list for the wireless power transmitter A and the wireless power transmitter B, the response signal is sent to the wireless power transmitter C. It can mean a signal that provides only a list.

The wireless power transmitter 200 and the wireless power receiver 300 as described above may perform active power transmission for each state 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 transmitter 200 and the wireless power receiver 300 are in a 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 transmitter 200 does not generate a power signal. Here, the power signal may mean a magnetic field transmitted to the reception induction coil of the wireless power receiver 300.

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

Second mode (connection)

When the wireless power transmitter 200 detects the wireless power receiver 300 in the first mode M1, the wireless power transmitter 200 transitions to the second mode M2 for transmitting power to the wireless power receiver 300. That is, when the wireless power transmitter 200 recognizes the existence of the wireless power receiver 300, the wireless power transmitter 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 an embodiment, the second mode M2 may be in a state of being basically ready to perform communication between the wireless power transmitter 200 and the wireless power receiver 300.

In the second mode M2, the wireless power transmitter 200 transmits a connection signal to the wireless power receiver 300. The connection signal may mean a power signal for detecting and identifying the wireless power receiver 300. If the wireless power transmitter 200 does not receive a response signal from the wireless power receiver 300 in response to the connection signal, it stops transmitting the connection signal and transitions to the first mode M1. If the wireless power transmitter 200 receives a response signal from the wireless power receiver 300 that the load (or battery) 340 of the wireless power receiver 300 is sufficiently charged, the wireless power transmission. Device 300 terminates the power transfer.

When the wireless power transmitter 200 receives a response signal for requesting power transmission from the wireless power receiver 300 in the second mode M2, the wireless power transmitter 300 may transmit an additional connection signal to a new wireless power. It can transmit to the receiver 300. The additional connection signal may mean a signal for detecting the new wireless power receiver 300.

When there is no response signal corresponding to the additional connection signal of the wireless power transmitter 200, the operation of detecting the new wireless power receiver 300 is stopped.

3rd mode (identification and setting)

When the wireless power transmitter 200 detects the wireless power receiver 300 in the second mode M2, the third mode M3 collects identification information and status information of the detected wireless power receiver 300. Transition to). In one embodiment, the third mode M3 may be an identification and setting mode. Here, the identification information of the wireless power receiver 300 may mean information such as the type, model, model, etc. of the wireless power receiver 300, but is not limited thereto. The state information of the wireless power receiver 300 remains in the maximum amount of power (or maximum charge) and load (or battery) 340 that can be provided to the load (or battery) 340 of the wireless power receiver 300. It may mean the present amount of power, but is not limited thereto. The wireless power transmitter 200 uses identification information and state information of the wireless power receiver 300 to generate a power transmission condition with the wireless power receiver 300. The power transmission condition may mean a set of conditions of variables for characterizing power transmission from the wireless power transmitter 200 to the wireless power receiver 300.

When a limitation occurs in the power transmission condition in the third mode M3, the control mode transitions to the first mode M1. In an embodiment, the constraint on the power transmission condition may mean a case where the power transmission condition is not established. In an embodiment, the constraint on the power transmission condition may mean that an unexpected data packet is transmitted between the wireless power transmitter 200 and the wireless power receiver 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 predetermined time after the wireless power receiver 300 receiving the power is removed.

In a state where the power transmission condition is changed in the third mode M3 and the transition to the first mode M1 occurs, the wireless power transmitter 200 wirelessly transmits state information related to the wireless power receivers 300. The controller may transmit the power to the power receiver 300 and then transition back to the third mode M3. In one embodiment, the state information of the wireless power transmitter 200 may refer to information about the number of wireless power receivers 300 to which one wireless power transmitter 200 provides power.

In one embodiment, the state information of the wireless power transmitter 200 is provided with a unique identification number for each wireless power receiver 300, the wireless power receiver 200 provides power to the specific wireless power transmitter 200 ( Information about the unique identification number of the 300 may be meant.

In one embodiment, the state information of the wireless power transmitter 200 may mean information on the amount of power provided to the wireless power receiver 300.

In one embodiment, the state information of the wireless power transmitter 200 refers to information on a priority of providing power to each wireless power receiver 300 in providing power to the wireless power receivers 300. can do.

In one embodiment, the state information of the wireless power transmitter 200 is information on the differential power providing ratio provided to each wireless power receiver 300 in providing power to the wireless power receiver 300. It may mean. For example, when a specific wireless power transmitter 200 is providing power to the three wireless power transmitters 300, the wireless power receiver differentially (50%, 30%, 20%) The information that is providing power to the 300.

When the number of the wireless power receivers 300 exceeds the specific number in the third mode M3, the mobile station may transition to the first mode M1 again. That is, when a specific wireless power transmitter 200 provides power to five wireless power receivers 300, when a new wireless power receiver 300 is detected, the newly detected wireless power receiver 300 is detected. Transition to the first mode (M1) to prevent power transmission to.

Fourth mode (power transfer)

When the power transmission condition is established in the third mode M3, the mobile station may transition to the fourth mode M4. In an embodiment, the fourth mode M4 may refer to a state in which the wireless power transmitter 200 is transmitting power to the wireless power receiver. In an exemplary embodiment, the fourth mode M4 supplies power to the wireless power receiver 300 while the wireless power transmitter 200 adjusts a current flowing through the coil in response to the information received from the wireless power receiver 300. The transmission mode may be.

If any one of the power transmission conditions is not satisfied in the fourth mode M4, the wireless power transmitter 200 stops power transmission to the wireless power receiver 300, and the first mode M1. To transition. In an embodiment, the constraint on the power transmission condition may mean a case where the power transmission condition is not established. In an embodiment, the constraint on the power transmission condition may mean that an unexpected data packet is transmitted between the wireless power transmitter 200 and the wireless power receiver 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 predetermined time after the wireless power receiver 300 receiving the power is removed.

In the fourth mode M4, the wireless power transmitter 200 receives a response signal indicating that the load (or battery) 340 of the wireless power receiver 300 is sufficiently charged from the wireless power receiver 300. In this case, the wireless power transmitter 300 terminates the power transmission and transitions to the first mode M1.

When the state of the wireless power receiver 300 is changed in the fourth mode M4, it may transition to the third mode M3.

In one embodiment, when the state of the wireless power receiver 300 is changed, the new wireless power receiver 300 is in the process of transmitting power to the wireless power receiver 300. It may mean the detected case. In this case, the wireless power transmission system transitions from the fourth mode M4 to the third mode M3. Thereafter, the wireless power transmitter 200 performs an operation for collecting identification information and status information of the wireless power receiver 300, and when the wireless power transmission condition is established, the wireless power transmitter 200 returns to the fourth mode M4. Transition If a limitation occurs in the wireless power transmission condition, the mobile station enters the first mode M1.

In one embodiment, when the state of the wireless power receiver 300 is changed, at least one new wireless power exceeding the number of wireless power receivers 300 that the wireless power transmitter 200 can provide power to. This may mean a case where the receiver 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 transmitter 200 performs a task for collecting identification information and status information of the wireless power receiver 300 and exceeds the number of ranges that the wireless power transmitter 200 can provide. In the wireless power receiver 300, the wireless power receiver 300 transitions to the first mode M1.

-5th mode (power transmission and bidirectional communication)

In the fourth mode M4, the wireless power transmitter 200 and the wireless power receiver 300 may transition to the fifth mode M5 in order to share information with each other.

In one embodiment, the fifth mode M5 may be a power transmission and a bidirectional communication mode. According to an embodiment, the fifth mode M5 may be a mode in which the wireless power transmitter 200 and the wireless power receiver 300 share information about their changed state while performing power transmission.

In one embodiment, the information about the changed state may refer to information such as a state in which the number of the wireless power transmitters 200 is changed or the amount of power that the wireless power transmitter 200 can supply is changed.

In one embodiment, the changed state information of the wireless power transmitter 200 may refer to information about a change in the number of wireless power receivers 300 to which one wireless power transmitter 200 provides power. .

In one embodiment, when the changed state information of the wireless power transmitter 200 is provided with each unique identification number for each wireless power receiver 300, the wireless power receiver 200 provides power for the specific wireless power transmitter 200. It may mean a change of information on the unique identification number of the device (300).

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

In one embodiment, the changed state information of the wireless power transmitter 200 is information on priority of providing power to the wireless power receiver 300 in providing power to the wireless power receiver 300. It may mean.

In one embodiment, the changed state information of the wireless power transmitter 200 is based on the differential power providing ratio provided to each wireless power receiver 300 in providing power to the wireless power receivers 300. Information may refer to For example, when a specific wireless power transmitter 200 is providing power to the three wireless power transmitters 300, the wireless power receiver differentially (50%, 30%, 20%) In the situation in which power is provided to the 300 devices, information about changing the ratio to 30%, 50%, or 20% according to the charging amount of each wireless power receiver 300 may be referred to.

When the power transmission condition is restricted in the fifth mode M5, the control unit 10 transitions to the first mode M1. In an embodiment, the constraint on the power transmission condition may mean a case where the power transmission condition is not established. In an embodiment, the restriction on the power transmission condition may mean that an unexpected packet is transmitted between the wireless power transmitter 200 and the wireless power receiver 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 predetermined time after the wireless power receiver 300 receiving the power is removed.

When the power transmission condition is restricted in the fifth mode (M1) and transitions to the first mode (M1), the wireless power transmitter 200 receives wireless power status information related to the wireless power receivers 300. Transmit to device 300 and transition back to fifth mode M5.

In the fifth mode M5, the wireless power transmitter 200 receives a response signal indicating that the load (or battery) 340 of the wireless power receiver 300 is sufficiently charged from the wireless power receiver 300. In this case, the wireless power transmitter 300 terminates the power transmission and transitions to the first mode M1.

When the state of the wireless power receiver 300 is changed in the fifth mode M5, it may transition to the fourth mode M4.

In one embodiment, when the state of the wireless power receiver 300 is changed, the wireless power transmitter 200 transmits power to the wireless power receiver 300 and performs new wireless power in a process of performing bidirectional communication. This may mean a case where the receiver 300 is detected.

In this case, the wireless power transmission system transitions from the fifth mode M5 to the fourth mode M4, and thereafter, the wireless power transmitter 200 may identify identification information and status information of the new wireless power receiver 300. To perform the operation to collect, if the wireless power transmission conditions are established, the transition to the fifth mode (M5) again. If a limitation occurs in the wireless power transmission condition, the mobile station enters the first mode M1.

In the present embodiment, the wireless power transmission using magnetic resonance has been described as an example, but the wireless power transmission method, the wireless power reception method, and the power control method using the bidirectional communication according to the present invention are based on other wireless power transmission using electromagnetic induction and RF method. Applicable to

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 should be understood that various modifications may be made by those skilled in the art 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: transmitter
240: identification unit
250: negotiation unit
260:
300: wireless power receiver
310: Receive resonant coil
320: reception induction coil
330: rectifier circuit
340: load
350: receiver
360: response signal transmission unit
370: negotiation unit
380: control unit

Claims (22)

A wireless power transmission method in which a wireless power transmitter transmits power to a wireless power receiver,
Transmitting a connection signal;
Identifying the wireless power receiver by receiving a response signal to the connection signal;
Negotiating for power transmission with the identified wireless power receiver; And
And transmitting power to the identified wireless power receiver according to the negotiated result. The method of claim 1, wherein negotiating power transmission with the identified wireless power receiver comprises:
Transmitting the status information of the wireless power transmitter to the identified wireless power receiver so that the identified wireless power receiver determines specific status information within the status information of the wireless power transmitter;
Receiving specific state information determined from the identified wireless power receiver;
The step of transmitting power to the identified wireless power receiver,
And transmitting power corresponding to the specific state information to the identified wireless power receiver. The method of claim 1, wherein negotiating power transmission with the identified wireless power receiver comprises:
Transmitting the amount of available power to the identified wireless power receiver so that the identified wireless power receiver determines the required amount of power within the available power range;
Receiving the required amount of power from the identified wireless power receiver,
The step of transmitting power to the identified wireless power receiver,
And transmitting power corresponding to the required amount of power to the identified wireless power receiver. The method of claim 1, wherein negotiating power transmission with the identified wireless power receiver comprises:
Transmitting information about a priority for providing power to the identified wireless power receiver and a plurality of wireless power receivers different from the identified wireless power receiver so that the identified wireless power receiver receives the information on the priority. To decide whether to accept a given rank within
Receiving a signal for accepting the predetermined rank from the identified wireless power receiver;
The step of transmitting power to the identified wireless power receiver,
And transmitting power to the identified wireless power receiver according to the determined rank. The method of claim 1, wherein negotiating power transmission with the identified wireless power receiver comprises:
Transmitting identification information about a plurality of wireless power transmitters to the identified wireless power receiver so that the identified wireless power receiver selects any one of the plurality of wireless power transmitters;
Receiving a signal corresponding to the selection from the identified wireless power receiver,
The step of transmitting power to the identified wireless power receiver,
The selected wireless power transmitter includes transmitting power to the identified wireless power receiver. The method of claim 2, wherein the state information of the wireless power transmitter is
Wireless power transmission including information on the maximum amount of power that the wireless power transmitter can supply, information about the number of wireless power receivers provided by the wireless power transmitter, and identification information on the wireless power transmitter. Way. The method of claim 1, wherein negotiating power transmission with the identified wireless power receiver comprises:
Receiving the status information of the identified wireless power receiver and determining, by the wireless power transmitter, specific status information within the status information of the identified wireless power receiver,
The step of transmitting power to the identified wireless power receiver,
And transmitting power corresponding to the specific state information to the identified wireless power receiver. The method of claim 1, wherein negotiating power transmission with the identified wireless power receiver comprises:
When receiving the required power amount of the identified wireless power receiver, and determines that the required power amount is within the available power range of the wireless power transmitter, determining to transmit power as required power amount of the identified wireless power receiver. Including steps
The step of transmitting power to the identified wireless power receiver,
And transmitting power corresponding to the required amount of power to the identified wireless power receiver. The method of claim 1, wherein the connection signal
And a signal for detecting and identifying the wireless power receiver. The method of claim 1,
If the wireless power transmitter does not receive the response signal, transmitting the connection signal to a new wireless power receiver. The method of claim 1,
And returning to the negotiating step when the state of the wireless power transmitter changes. The method of claim 11, wherein the state of the wireless power transmitter changes.
And a change in the maximum amount of power supplied by the wireless power transmitter or the number of wireless power receivers provided by the wireless power transmitter. A wireless power reception method in which a wireless power receiver receives power from a wireless power transmitter,
Receiving a connection signal for identifying the wireless power receiver;
Transmitting a response signal to the connection signal to the wireless power transmitter;
Negotiating power transmission with the wireless power transmitter; And
And receiving power from the wireless power transmitter in accordance with the negotiated result. The method of claim 13, wherein the negotiating with the wireless power transmitter for power transmission comprises:
Receiving status information of the wireless power transmitter and determining specific status information within the status information of the wireless power transmitter;
Transmitting the specific status information determined to the wireless power transmitter;
Receiving power from the identified wireless power transmitter,
And receiving power corresponding to the determined specific state information from the wireless power transmitter. The method of claim 13, wherein the negotiating with the wireless power transmitter for power transmission comprises:
Receiving the available power amount from the wireless power transmitter and determining a required power amount within the available power range;
Transmitting the required amount of power to the wireless power transmitter,
Receiving power from the wireless power transmitter,
And receiving power corresponding to the required amount of power from the wireless power transmitter. The method of claim 13, wherein the negotiating with the wireless power transmitter for power transmission comprises:
Receiving information on a priority for providing power to the wireless power receiver and a plurality of wireless power receivers from the wireless power transmitter, the wireless power receiver receives a predetermined rank within the information on the priority. Decide whether or not to
Transmitting a signal for accepting the predetermined rank to the wireless power transmitter,
Receiving power from the wireless power transmitter,
And receiving power from the wireless power transmitter according to the determined rank. The method of claim 13, wherein the negotiating with the wireless power receiver for power transmission comprises:
Receiving identification information about a plurality of wireless power transmitters and selecting one of the plurality of wireless power transmitters;
Transmitting the selection request signal to the wireless power transmitter;
Receiving power from the wireless power transmitter,
And receiving power from the selected wireless power transmitter. 15. The method of claim 14, wherein the state information of the wireless power transmitter,
Wireless power reception including information on the maximum amount of power that the wireless power transmitter can supply, information on the number of wireless power receivers provided by the wireless power transmitter, and identification information about the wireless power transmitter. Way. The method of claim 13, wherein the connection signal
Wireless power receiving method is a signal for detecting and identifying the wireless power receiver. The method of claim 13,
If the state of the wireless power receiver is changed, the wireless power reception method further comprising the step of returning to the negotiating step. The method of claim 13, wherein the state of the wireless power receiver is changed.
Wireless power receiving method comprising the case where a new wireless power receiver is detected. The method of claim 13,
And transmitting a signal for stopping power transmission to the wireless power transmitter when the amount of charge of the wireless power receiver is maximum.

Images