KR102108502B1 - 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

A wireless power transmission method in which a wireless power transmission device transmits power to a wireless power reception device includes: 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 transmitting power to the identified wireless power receiver according to the negotiated result.

Description

Wireless power transmission device, wireless power reception device, 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 transmitting apparatus, a wireless power receiving apparatus, a wireless power transmitting method, a wireless power receiving method, an information transmitting method and an information receiving method.

Wireless power transmission or wireless energy transfer technology that wirelessly transfers electric energy to a desired device has already begun to use electric motors or transformers using the electromagnetic induction principle in the 1800s. A method of transmitting electrical energy by radiating the same electromagnetic wave has also been attempted. Electric toothbrushes and some wireless shavers that we commonly use are actually charged using the electromagnetic induction principle. To date, the energy transmission method using the wireless method includes magnetic induction, magnetic resonance, and long-distance transmission technology using short-wavelength radio frequencies.

Recently, among these wireless power transmission technologies, an energy transmission method using magnetic resonance has been widely used.

In a wireless power transmission system using magnetic resonance, since an electric signal formed on a transmitting side and a receiving side is wirelessly transmitted through a coil, a user can easily charge electronic devices such as portable devices.

Conventionally, the transmission side receives the status information about the receiving side through electromagnetic induction and performs power transmission. However, the technique of performing the power transmission by receiving side status information on the receiving side through the magnetic resonance method Development is still insignificant.

In addition, since the wireless power can be transmitted between the transmitting side and the receiving side in a self-resonant manner, the receiving side also knows the status information of the transmitting side, so more efficient power transmission is possible, so that the transmitting and receiving sides share status information with each other It requires two-way communication.

Korean Patent Publication No. 10-2011-0062841 is related to the prior patent literature.

The present invention is a wireless power transmitter, wireless power receiver, wireless power transmitter, wireless power receiver, information transmission method and information that actively transmits power by transmitting and receiving status information between the wireless power transmitter and the wireless power receiver. It aims at providing a reception method.

A wireless power transmission method in which a wireless power transmission apparatus according to an embodiment of the present invention transmits power to a wireless power reception apparatus includes: 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 transmitting power to the identified wireless power receiver according to the negotiated result.

A wireless power receiving method in which a wireless power receiving apparatus according to an embodiment of the present invention receives power from a wireless power transmitting apparatus comprises: receiving a connection signal for identifying the wireless power receiving apparatus; 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 in which a wireless power transmitter according to an embodiment of the present invention transmits information to a wireless power receiver includes transmitting a plurality of status lists of the wireless power transmitter to the wireless power receiver; Receiving a request signal requesting one or more status lists among the plurality of status lists; And transmitting a response signal corresponding to the request signal to the wireless power receiver.

An information receiving method in which a wireless power receiving apparatus receives information from a wireless power transmitting apparatus according to an embodiment of the present invention includes receiving a plurality of status lists of the wireless power transmitting apparatus from the wireless power receiving apparatus; Transmitting a request signal requesting one or more status lists among 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 that receives the response signal for the connection signal and identifies the wireless power receiver; A negotiating unit negotiating power transmission with the identified wireless power receiving device; And a controller configured to transmit power to the identified wireless power receiver according to the negotiated result.

A wireless power receiving device for receiving power from a wireless power transmitting device according to an embodiment of the present invention includes a receiving unit for receiving a connection signal for identifying the wireless power receiving device; A response signal transmitter for transmitting a response signal for the connection signal to the wireless power transmitter; A negotiation unit negotiating power transmission with the wireless power transmission apparatus; 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 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 transmitter and a wireless power receiver according to an embodiment of the present invention.
6 is a flowchart of a method for transmitting wireless power according to an embodiment of the present invention.
7 is a flowchart of a method for transmitting wireless power 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 so that those skilled in the art to which the present invention pertains can easily practice.

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

The power generated from the power source 100 is transmitted to the wireless power transmission apparatus 200, and the resonance power value of the wireless power receiving apparatus 300 having the same resonance frequency value is achieved by resonating with the wireless power transmission apparatus 200 by a magnetic resonance phenomenon. ).

Looking more specifically, the power source 100 is an AC power source that provides AC power of a predetermined frequency.

The wireless power transmitter 200 is composed of a transmission induction coil 210 and a transmission resonance coil 220. The transmission induction coil 210 is connected to the power source 100, and an alternating current flows. When an AC current flows through the transmission induction coil 210, an AC current is also induced to the transmission resonance coil 220 that is physically separated by electromagnetic induction. The power transmitted to the transmission resonance coil 220 is transmitted to the wireless power receiver 300 by magnetic resonance.

Power may be transmitted between two LC circuits having impedance matching by magnetic resonance. The power transmission by self-resonance has an advantage in that the degree of freedom of position and distance between the wireless power transmitter 200 and the wireless power receiver 300 is increased compared to the power transmission by electromagnetic induction.

The wireless power receiving device 300 is composed of a receiving resonant coil 310, a receiving induction coil 320, a rectifying 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 through the reception resonant coil 310. The power delivered to the receiving resonant coil 310 is transmitted to the receiving induction coil 320 by electromagnetic induction. The power delivered to the receiving induction coil 320 is rectified through the rectifying circuit 330 and transmitted 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 illustrated 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. 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. 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 composed of inductors L1 and L2 and capacitors C1 and C2 having predetermined inductance values and capacitance values, respectively.

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

As shown in FIG. 4, the receiving resonant coil 310 and the receiving induction coil 320 may be composed 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 and outputs AC power to DC power. The load 340 is indicated by a DC power of 1.3 V, but may be any rechargeable battery or device requiring 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 transmission apparatus 200 may include a transmission unit 230, an identification unit 240, a negotiation unit 250, and a control unit 260. Also, the transmission induction coil 210 illustrated in FIG. 1 and the transmission resonance coil 220 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 resonant coil 310, the reception induction coil 320, the rectifying circuit 330, and the load 340 shown in Figure 1 may be further included.

The transmitter 230 transmits a connection signal to the receiver 350. In one embodiment, the connection signal may refer to 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 for 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 wireless power receiver 300 is stopped. In one embodiment, the case where the identification unit 240 does not receive a response signal means that it does not receive a response signal by transmitting a connection signal to an object other than an object capable of power transmission, for example, an object such as a key or coin. Can be.

The negotiating unit 250 negotiates with the identified wireless power receiving device 300 for power transmission, and the control unit 260 transmits power to the identified wireless power receiving device according to the negotiated result.

The negotiating unit 250 transmits the status information of the wireless power transmitter 200 to the identified wireless power receiver 300 so that the identified wireless power receiver 300 has the status information of the wireless power transmitter 200 The specific state information is determined within the receiver, and the specific state information determined from the identified wireless power receiver 300 is received.

In one embodiment, the status 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 of the wireless power transmission apparatus 200.

According to an embodiment, the status information of the wireless power receiving device 300 may include information about a current charging amount or a trend of the charging amount of the wireless power receiving device 300.

The negotiation unit 250 determines the specific status information within the status information of the identified wireless power receiving apparatus 300 by receiving the status information of the identified wireless power receiving apparatus 300, and the controller 260 determines the specific status information. To transmit the power corresponding to the identified wireless power receiver 300.

In one embodiment, the negotiating unit 250 transmits the amount of available power to the identified wireless power receiver 300 so that the identified wireless power receiver 300 determines the required amount of power within the range of available power. Thereafter, when the wireless power receiver 300 determines the required power amount, the negotiation unit 250 receives the required power amount. The control unit 260 transmits power corresponding to the required power amount 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 resonant coil 310, the reception induction coil 320, the rectifying circuit 330, and the load 340 shown in Figure 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 a response signal for the connection signal to the wireless power transmitter.

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

In one embodiment, the negotiation unit 370 receives the status information of the wireless power transmission apparatus 200 and determines specific status information within the status information of the wireless power transmission apparatus 200, and the wireless power transmission apparatus 200 The specific status information is transmitted to the controller, and the control unit 380 receives power corresponding to the specific status 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 of a method for transmitting wireless power according to an embodiment of the present invention.

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

In one embodiment, the two-way communication of the present invention can be implemented through a configuration for changing the amount of current in the wireless power transmitter 200 and the wireless power receiver 300, for example, in-band communication by a variable resistor or a switch. Do.

In an embodiment, separate wireless communication modules such as Bluetooth, NFC, and ZigBee may be added to the wireless power transmitter 200 and the wireless power receiver 300 to perform communication.

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

When the wireless power transmitter 200 identifies the wireless power receiver 300, it 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 is successful (S107), the wireless power transmitter 200 transmits power to the identified wireless power receiver 300 (S109). ).

In the negotiating step (S105) of determining whether to transmit power to the identified wireless power receiving apparatus 300, the identification is performed by transmitting status information of the wireless power transmitting apparatus 200 to the identified wireless power receiving apparatus 300. Allowing the wireless power receiving device 300 to determine specific state information within the state information of the wireless power transmitting device 300 and receiving the specific state information from the identified wireless power receiving device 300. It may include.

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

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

The wireless power transmission apparatus 200 transmits information on priorities in which the wireless power transmission apparatus 200 provides power to a plurality of wireless power reception apparatuses to the identified wireless power reception apparatus 300, and identifies the identified wireless power The receiving device 300 determines whether to accept a predetermined priority within the priority information. Thereafter, when the identified wireless power receiving apparatus 300 accepts the predetermined priority, the wireless power transmitting apparatus 200 transmits power according to the predetermined priority.

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

The wireless power transmitter 200 may be configured in plural. The plurality of wireless power transmitters 200 transmits the identification information of the plurality of wireless power transmitters 200 to the identified wireless power receiver 300, and the identified wireless power receivers 300 have a plurality of wireless power One of the transmission devices 200 is determined. Then, 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 one embodiment, the negotiation step may mean requesting status information of the wireless power receiving apparatus and transmitting status information of the wireless power transmitting apparatus corresponding to the request to the wireless power receiving apparatus.

In one embodiment, the negotiation step may mean determining whether to transmit power using state information held between the wireless power transmitter 200 and the wireless power receiver 300.

In one embodiment, the status information of the wireless power transmitter 200 may mean information on the number of wireless power receivers 300 that one wireless power transmitter 200 is providing power.

In one embodiment, the status information of the wireless power transmission device 200 is a wireless power reception device that provides a power by a specific wireless power transmission device 200 when each unique identification number is assigned to each wireless power reception device 300 ( It may mean information about the unique identification number of 300).

In one embodiment, the status 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 status information of the wireless power transmitter 200 provides information to a plurality of wireless power receivers 300, and information about priorities for providing power to each wireless power receiver 300 Can mean

In one embodiment, the state information of the wireless power transmitter 200 provides information to the wireless power receiver 300 in providing power to each wireless power receiver 300. Can mean For example, when a specific wireless power transmission device 200 provides power to three wireless power transmission devices 300, the wireless power reception device differentially at a ratio of 50%, 30%, 20% ( 300).

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

In one embodiment, the status information of the wireless power receiving device 300 may mean information about which wireless power transmitting device 200 the wireless power receiving device 300 is receiving power. That is, it may mean identification information of a wireless power transmission device that receives power.

If the negotiation between the wireless power transmitter 200 and the wireless power receiver 300 is successful (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 transmitter 200 is changed (S111), the process returns to the negotiation step (S105), or the power transmission is stopped.

In an embodiment, when the state of the wireless power transmission apparatus 200 is changed, it may mean information about a change in the amount of power that the wireless power transmission apparatus 200 can supply. In this case, if the amount of power that the wireless power transmitter 200 can provide decreases due to external factors, the wireless power transmitter 200 stops providing power and enters a negotiation step (S105) to transmit wireless power. Negotiations for adjusting the power transmission amount between the device 200 and the wireless power receiver 300 are performed. Thereafter, if the negotiation is successful according to the adjusted power transmission amount, the power transmission is performed, and if not, the negotiation step S105 is entered again. If the power supply to the wireless power transmitter 200 is cut off or the charging of the wireless power receiver 300 is completed, the power transmission is terminated.

In one embodiment, when the state of the wireless power transmitting apparatus 200 is changed, it means information about the number of the wireless power receiving apparatus 300 in which one wireless power transmitting apparatus 200 is providing power. Can be.

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

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

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

Referring to FIG. 7, first, the wireless power transmitter 200 transmits a status list of the wireless power transmitter 200 to the wireless power receiver 300 (S201). The status list of the wireless power transmitter 200 indicates the status information of the wireless power transmitter 200, the maximum amount of power that can be transmitted by the wireless power transmitter 200, and the wireless power transmitter 200 The number of wireless power receiving devices 300 provided and the amount of available power of the wireless power transmitting devices 200 may be included. Table 1 explains this in more detail.

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

In Table 1, the maximum power supply amount of the wireless power transmitter A is 100 W, and power is supplied to the four wireless power receivers 300. In addition, each wireless power transmission device (A) means that 20W of available power remains. Here, the amount of available power may mean the amount of power that can be provided to other wireless power receiving devices in addition to the plurality of wireless power receiving devices currently provided by the wireless power transmitting apparatus 200. In addition, the required amount of power of each of the six wireless power receivers 300 provided by the wireless power transmitter C is not limited to a constant amount of power and may be different.

The amount of available power of each wireless power transmitter 300 may be different for each individual wireless power transmitter 200, and in this case, status information about the amount of available power for each wireless power transmitter 200 may be transmitted.

The maximum amount of power supplied to the wireless power transmitter B is 200 W, and power is supplied to the five wireless power receivers 300. In addition, the amount of available power of the wireless power transmitter B is 15 W. In addition, the required amount of power of each of the six wireless power receivers 300 provided by the wireless power transmitter C is not limited to a constant amount of power and may be different.

The maximum amount of power supplied to the wireless power transmitter C is 300 W, and power is supplied to the six wireless power receivers 300. In addition, the amount of available power of the wireless power transmitter C is 30 W. The required amount of power of each of the six wireless power receiving devices 300 provided by the wireless power transmitting device C is not limited to a constant power, and may be different.

The wireless power transmitter 200 transmits a status list as shown in Table 1 above, 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). At this time, 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 The signal may be transmitted, and a signal 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 that rejects 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 may mean a signal that provides only a list for.

The wireless power transmission apparatus 200 and the wireless power reception apparatus 300 as described above may perform active power transmission suitable for each state through two-way 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 receiving device 300.

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

-2nd mode (connection)

When the wireless power transmitter 200 detects the wireless power receiver 300 in the first mode M1, it 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 one embodiment, the second mode M2 may be in a state in which a basic preparation is performed 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, when the wireless power transmitter 200 does not receive a response signal for the connection signal from the wireless power receiver 300, the transmission of the connection signal is stopped, and transition to the first mode (M1). If, when 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, wireless power transmission The device 300 ends the power transmission.

In the second mode (M2), when the wireless power transmitter 200 receives a response signal requesting power transmission from the wireless power receiver 300, the wireless power transmitter 300 transmits an additional connection signal to the new wireless power. It can be transmitted to the receiving device 300. The additional connection signal may mean a signal for detecting the new wireless power receiver 300.

If 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, a third mode (M3) for collecting identification information and status information of the detected wireless power receiver 300 ). In one embodiment, the third mode M3 may be an identification and setting mode. Here, the identification information of the wireless power receiving device 300 may mean information such as the type, model, and model of the wireless power receiving device 300, but is not limited thereto. The status 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 current amount of power, etc., but is not limited thereto. The wireless power transmitter 200 uses identification information and status information of the wireless power receiver 300 to generate power transmission conditions with the wireless power receiver 300. The power transmission condition may refer to a set of conditions of variables for characterizing power transmission from the wireless power transmitter 200 to the wireless power receiver 300.

When a constraint occurs in the power transmission condition in the third mode M3, the process transitions to the first mode M1. In one embodiment, the constraint on the power transmission condition may mean a case where the power transmission condition is not established. In one 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 timeout. The timeout includes a case in which the power transmission is stopped after a certain time after the wireless power receiving device 300 receiving power is removed.

In a state in which transition to the first mode M1 occurs due to a constraint on the power transmission condition in the third mode M3, the wireless power transmitter 200 wirelessly transmits state information related to the wireless power receivers 300. Transmitting to the power receiving device 300, and may transition back to the third mode (M3). In one embodiment, the status information of the wireless power transmitter 200 may mean information on the number of wireless power receivers 300 that one wireless power transmitter 200 is providing power.

In one embodiment, the status information of the wireless power transmission device 200 is a wireless power reception device that provides a power by a specific wireless power transmission device 200 when each unique identification number is assigned to each wireless power reception device 300 ( It may mean information about the unique identification number of 300).

In one embodiment, the status 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 status information of the wireless power transmitter 200 refers to information on priorities for providing power to each wireless power receiver 300 when providing power to the wireless power receivers 300. can do.

In one embodiment, the state information of the wireless power transmitter 200 provides information to the wireless power receiver 300 in providing power to each wireless power receiver 300. Can mean For example, when a specific wireless power transmission device 200 provides power to three wireless power transmission devices 300, the wireless power reception device differentially at a ratio of 50%, 30%, 20% ( 300).

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

-4th mode (power transmission)

When the power transmission condition is established in the third mode M3, the user may transition to the fourth mode M4. In one embodiment, the fourth mode M4 may mean a state in which the wireless power transmitter 200 is transmitting power to the wireless power receiver. In one embodiment, the fourth mode M4 controls the current flowing through the coil in response to information received from the wireless power receiver 300 by the wireless power transmitter 200 while supplying power to the wireless power receiver 300. It may be a transmitting mode.

If any one of the power transmission conditions in the fourth mode (M4) is not satisfied, the wireless power transmitter 200 stops the power transmission to the wireless power receiver 300, and the first mode (M1) Transitions to In one embodiment, the constraint on the power transmission condition may mean a case where the power transmission condition is not established. In one 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 timeout. The timeout includes a case in which the power transmission is stopped after a certain time after the wireless power receiving device 300 receiving power is removed.

In the fourth mode (M4), 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. In this case, the wireless power transmission apparatus 300 ends 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, the device may transition to the third mode M3.

In one embodiment, when the state of the wireless power receiving device 300 is changed, the new wireless power receiving device 300 is transmitted while the wireless power transmitting device 200 is transmitting power to the wireless power receiving device 300. It may mean the case where it was 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 when the wireless power transmission condition is established, returns to the fourth mode (M4). Transition. If the wireless power transmission condition is restricted, the process transitions to the first mode M1.

In one embodiment, when the state of the wireless power receiving device 300 is changed, the wireless power transmitting device 200 exceeds the number of wireless power receiving devices 300 capable of providing power, and at least one new wireless power It may mean that the receiving device 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 one wireless power receiving device 300, the transition to the first mode (M1).

-5th mode (power transmission and two-way communication)

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

In one embodiment, the fifth mode M5 may be a power transmission and bidirectional communication mode. In one embodiment, the fifth mode M5 may be a mode in which information about each changed state is shared while performing power transmission between the wireless power transmitter 200 and the wireless power receiver 300.

In one embodiment, the information about the changed state may mean information such as the number of wireless power transmitters 200 being changed or the amount of power the wireless power transmitter 200 can supply is changed.

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

In one embodiment, the status information to be changed of the wireless power transmission apparatus 200 is a wireless power reception provided by the specific wireless power transmission apparatus 200, when each unique identification number is assigned to each wireless power reception apparatus 300 It may mean changing information on the unique identification numbers of the devices 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 provides information to the wireless power receivers 300, and information about priorities for providing power to each wireless power receiver 300 Can mean

In one embodiment, the changed state information of the wireless power transmission apparatus 200 provides power to the wireless power reception apparatuses 300, in accordance with the differential power supply ratio provided to each wireless power reception apparatus 300. Information. For example, when a specific wireless power transmission device 200 provides power to three wireless power transmission devices 300, the wireless power reception device differentially at a ratio of 50%, 30%, 20% ( In a situation in which power is provided to 300), it may mean information about changing the ratio to 30%, 50%, or 20% according to the charging amount of each wireless power receiver 300.

When the power transmission condition is restricted in the fifth mode M5, the transition to the first mode M1 occurs. In one embodiment, the constraint on the power transmission condition may mean a case where the power transmission condition is not established. In one embodiment, the constraint 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 timeout. The timeout includes a case in which the power transmission is stopped after a certain time after the wireless power receiving device 300 receiving power is removed.

When the power transmission condition is restricted in the fifth mode (M1) and the transition to the first mode (M1) occurs, the wireless power transmitter 200 receives the wireless power receiving state information associated with the wireless power receivers 300. It may transmit to the device 300, and may transition back to the fifth mode M5.

In the fifth mode (M5), 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. In this case, the wireless power transmission apparatus 300 ends 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, the device may transition to the fourth mode M4.

In one embodiment, when the state of the wireless power receiving device 300 is changed, the wireless power transmitting device 200 transmits power to the wireless power receiving device 300 and performs new two-way communication in the process of performing wireless communication. It may mean that the receiving device 300 is detected.

In this case, the wireless power transmission system transitions from the fifth mode (M5) to the fourth mode (M4), and then, the wireless power transmission device 200 identifies and statuses information of the new wireless power receiving device 300 To perform the operation for collecting, and when the wireless power transmission conditions are established, the transition to the fifth mode (M5) again. If the wireless power transmission condition is restricted, the process transitions to the first mode M1.

In this 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 two-way communication of the present invention are other wireless power transmission using electromagnetic induction, RF method, etc. It is also applicable to.

In addition, although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications can be carried out by a person having ordinary knowledge in the course, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

100: power source
200: wireless power transmission device
210: transmission induction coil
220: transmit resonant coil
230: transmitter
240: identification unit
250: negotiation department
260: control unit
300: wireless power receiver
310: receiving resonant coil
320: receive induction coil
330: rectifier circuit
340: load
350: receiver
360: response signal transmission unit
370: negotiation department
380: control unit

Claims (16)

In the wireless power transmission method of the wireless power transmitter,
Performing a negotiation procedure with a wireless power receiver to negotiate power transmission conditions; And
If the required power of the wireless power receiver is less than or equal to the available power of the wireless power transmitter, and transmitting the wireless power based on the negotiated power transmission conditions,
The negotiation process,
The wireless power receiver receiving a request signal from the wireless power receiver to obtain the capability of the wireless power transmitter including the available power;
In response to the request signal, the wireless power receiver transmitting the capability to determine the requested power based on the available power; And
Receiving the requested power for setting the negotiated power transmission condition from the wireless power receiver,
Further comprising re-entering the negotiation procedure with the wireless power receiver in order to adjust the negotiated power transmission condition in response to a change in state of the wireless power transmitter while transmitting the wireless power,
The state of the wireless power transmitter is a wireless power transmission method comprising a state change in which the amount of the wireless power supplied from the wireless power transmitter is reduced by an external element. delete delete According to claim 1,
And re-entering the negotiation procedure with the wireless power receiver to adjust the negotiated power transmission condition in response to a change in state of the wireless power receiver while transmitting the wireless power. Power transmission method. In the wireless power receiving method of the wireless power receiver,
Performing a negotiation procedure with a wireless power transmitter to negotiate power transmission conditions; And
If the required power of the wireless power receiver is less than or equal to the available power of the wireless power transmitter, receiving the wireless power from the wireless power transmitter based on the negotiated power transmission conditions,
The negotiation process,
Transmitting a request signal for acquiring the capability of the wireless power transmitter including the amount of available power to the wireless power transmitter;
Receiving the amount of available power from the wireless power transmitter in response to the request signal;
Determining a required power amount based on the available power amount; And
Transmitting the required amount of power to set the negotiated power transmission condition to the wireless power transmitter
Including,
Further comprising re-entering the negotiation procedure with the wireless power transmitter in order to adjust the negotiated power transmission condition in response to a change in state of the wireless power transmitter while receiving the wireless power,
The state change of the wireless power transmitter includes a state change in which the amount of the wireless power supplied from the wireless power transmitter is reduced by an external element. delete delete The method of claim 5,
And re-entering the negotiation procedure with the wireless power transmitter to adjust the negotiated power transmission condition in response to a change in state of the wireless power receiver while receiving the wireless power. How to receive power. A negotiation unit performing a negotiation procedure with a wireless power transmitter to negotiate power transmission conditions;
A coil that receives wireless power from the wireless power transmitter based on the negotiated power transmission condition;
A rectifying circuit that converts the wireless power received from the wireless power transmitter into DC power and delivers it to a load; And
Control unit for controlling power reception according to the negotiated power transmission conditions
Including,
The negotiation department
A request signal for acquiring the capability of the wireless power transmitter including the amount of available power of the wireless power transmitter is transmitted to the wireless power transmitter, and the available power amount is received from the wireless power transmitter in response to the request signal And determines the required power amount based on the available power amount, and transmits the required power amount for setting the negotiated power transmission condition to the wireless power transmitter,
The required power amount of the wireless power receiver is less than or equal to the available power amount of the wireless power transmitter,
The control unit controls to re-enter the negotiation procedure with the wireless power transmitter in order to adjust the negotiated power transmission condition in response to a state change of the wireless power transmitter while receiving the wireless power,
The state change of the wireless power transmitter includes a state change in which the amount of the wireless power received from the wireless power transmitter is reduced by an external element. delete delete The method of claim 9,
The control unit controls the wireless power transmitter to re-enter the negotiation procedure with the wireless power transmitter to adjust the negotiated power transmission condition in response to a state change of the wireless power receiver while receiving the wireless power. A transmitter for transmitting wireless power;
A negotiation unit performing a negotiation procedure with a wireless power receiver to negotiate power transmission conditions; And
If the required power of the wireless power receiver is less than or equal to the available power of the wireless power transmitter, a control unit that controls to transmit the wireless power based on the negotiated power transmission conditions
Including,
The negotiation unit,
The wireless power receiver receives a request signal for obtaining the capability of the wireless power transmitter including the available power from the wireless power receiver, and in response to the request signal, the wireless power receiver receives the available power Transmitting the capability for determining the requested power based on the received power, and receiving the requested power for setting the negotiated power transmission condition from the wireless power receiver,
The control unit controls to re-enter the negotiation procedure with the wireless power receiver to adjust the negotiated power transmission condition in response to a change in the state of the wireless power transmitter while transmitting the wireless power,
The state change of the wireless power transmitter includes a state change in which the amount of the wireless power supplied from the wireless power transmitter is reduced by an external element. delete delete The method of claim 13,
The control unit,
A wireless power transmitter controlling to re-enter the negotiation procedure with the wireless power receiver in order to adjust the negotiated power transmission condition in response to a change in state of the wireless power receiver while transmitting the wireless power.

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