KR20120052517A - Wireless power transmission method, wireless power receiving method, wireless power transmission apparatus and wireless power receiving apparatus - Google Patents

Abstract

PURPOSE: A wireless power transmitting device and method, and a wireless power receiving device and method are provided to minimize energy which is used to transmit and receive wireless power by effectively transmitting and receiving the wireless power. CONSTITUTION: A transmission side resonance power generation part(130) creates resonance power by a resonance coupling mode. The transmission side resonance power generation part comprises a transmission side resonance power generator(135) and a transmission side signal processor(131). A transmission side power supply part(110) supplies a power source to the transmission side resonance power generation part. A transmission side controller(170) controls each element included in a wireless power transmitting device(100). A wireless power receiving device(200) comprises a charge part(210), a receiving side resonance power processor(230), and a receiving side controller(270).

Description

WIRELESS POWER TRANSMISSION METHOD, WIRELESS POWER RECEIVING METHOD, WIRELESS POWER TRANSMISSION APPARATUS AND WIRELESS POWER RECEIVING APPARATUS}

The present invention relates to a wireless power transmission method, a wireless power reception method, a wireless power transmission device and a wireless power reception device, and more particularly, a wireless power transmission method for transmitting and receiving resonance power according to a resonance coupling method, a wireless power reception method, and wireless It relates to a power transmitter and a wireless power receiver.

Almost all home appliances, portable and office devices and industrial devices used in everyday life use electrical energy supplied by wires at power plants. However, recent developments and widespread use of various portable devices have shown that wired power supply is not a suitable power supply for portable devices. In the case of the mobile phone, which is a necessity of everyday life, it is difficult to charge it anywhere easily when the battery is exhausted.In addition, as the use of the laptop (LAP TOP) computer increases, the problem of capacity and weight of the battery becomes more serious. The situation is emerging. Thus, if energy transfer can be done wirelessly in the office or in the industry, it can be expected that there will be new revolutionary changes in economic and industrial terms.

A wireless power transmission method, a wireless power reception method, a wireless power transmission device, and a wireless power reception device according to the present invention have an object of efficiently transmitting and receiving wireless power.

Wireless power transmission method for wirelessly transmitting power in accordance with the present invention for achieving the above object comprises the steps of: recognizing an external device; Requesting charging related information from the external device when the external device is recognized; Receiving a charge response signal including the charge related information corresponding to the charge related information from the external device; Generating resonance power based on the charge response signal including the charge related information; And wirelessly outputting the resonance power to the external device.

The recognizing the external device may include outputting a detection signal periodically; The method may include receiving a sensing response signal with respect to the sensing signal. The detection response signal may be shifted in frequency of the detection signal.

Recognizing the external device may include receiving a detection signal from a predetermined external device; When the detection signal is received may include the step of activating the control unit for controlling to generate the resonance power.

And when the detection signal is received, outputting an authentication request signal to the external device; Receiving an authentication response signal corresponding to the authentication request signal; The method may further include determining whether the external device is capable of charging based on the authentication response signal. The charging related information may include at least one of resonance frequency, voltage, and power of the resonance power required for charging the external device.

The method may further include outputting a status check request signal for confirming a charging state while outputting the resonance power. The generating of the resonance power may include: a status check signal received in response to the status check request signal; It is possible to adjust the state of the resonance power based on. Here, the status check signal may include charging completion information indicating that the charging of the external device is completed, and when the charging completion information is received, generation and output of the resonance power may be terminated.

On the other hand, a wireless power charging method for performing the charging with the wirelessly received power according to the present invention for achieving the above object, the step of recognizing an external wireless power transmission device for generating a wireless power; Receiving a request signal for requesting charging related information from the external wireless power transmitter; Outputting a charge response signal including the charge related information corresponding to the request signal to the external wireless power transmitter;

Receiving resonance power generated based on the charging response signal from the external wireless power transmitter; The charging may be performed by the resonance power.

The recognizing the external wireless power transmitter may include: receiving a predetermined detection signal from the external wireless power transmitter; And outputting a sensing response signal to the sensing signal to the external wireless power transmitter.

The recognizing the external wireless power transmitter may include: outputting a predetermined detection signal; Receiving a signal in response to the detection corresponding to the detection signal from a predetermined external wireless power transmission device.

The charging related information may include at least one of a resonance frequency, a voltage, and a power of the resonance power required for charging the external device.

On the other hand, in the wireless power transmission apparatus for wirelessly transmitting power according to the present invention for achieving the above object, the resonance power generation for generating a resonance power at a predetermined resonance frequency and transmitting the generated resonance power to an external device Wealth; A power supply unit supplying power to the resonance power generation unit; Recognizing a predetermined external device, if the external device is recognized, requesting the charging related information from the external device, and based on the charging response signal including the charging related information corresponding to the charging related information from the external device It may include a control unit for controlling the resonance power generation unit to generate a resonance power and output to the external device.

The apparatus may further include a communication unit for transmitting and receiving data, and the controller may output a request signal for requesting the charging related information through the communication unit, and receive the charging response signal.

On the other hand, the wireless power charging device for performing the charging with the wirelessly received power according to the present invention for achieving the above object, the power receiving unit for receiving a predetermined resonance power; A charging unit which performs charging based on the resonance power; Recognizing an external wireless power transmission device for generating the resonance power, when a request signal for requesting charging related information is received from the external wireless power transmission device, the charging response signal including the charging related information corresponding to the request signal And a control unit for controlling the charging unit to perform charging by the resonance power when the resonance power generated based on the charging response signal is received from the external wireless power transmitter through the power receiver. It may include.

The wireless power transmission method, the wireless power reception method, the wireless power transmission device, and the wireless power reception device according to the present invention efficiently transmit and receive wireless power. Therefore, there is an effect that can minimize the energy used to transmit and receive wireless power. In addition, the communication between the wireless power transmitter and the wireless power receiver does not need to add a separate component has the effect of increasing the efficiency of the cost and space by performing communication only with the existing components.

1 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.
2 is a simplified circuit diagram of a transmitting side resonant power generation unit and a transmitting side power supply unit of the wireless power transmission apparatus according to the present invention, and a simplified circuit diagram of a wireless power receiving apparatus for receiving the resonance power.
3 and 4 are control flow diagrams briefly showing the transmission and reception procedure between the wireless power transmission apparatus and the wireless power receiving apparatus according to the present invention.
5 to 10 are control flowcharts specifically illustrating the above-described recognition step, authentication step, connection step, transmission and reception step.

DETAILED DESCRIPTION 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.

The terminology used in the present invention was selected as a general term that is widely used at present, but in some cases, the term is arbitrarily selected by the applicant, and in this case, the meaning of the term is described in detail in the description of the present invention. The present invention should be understood as meanings other than terms.

Hereinafter, one embodiment of a power transmission apparatus for wirelessly transmitting power constituting the present invention will be described in detail. In adding reference numerals to the components of the following drawings, the same components are used the same reference numerals as much as possible even if they are displayed on different drawings.

The wireless power transmission system according to an embodiment of the present invention is a system capable of wirelessly supplying power between devices that are not connected to a line for directly supplying power, and are inductive coupling. A method of generating inductive power by a method and a method of generating resonance power by a resonance coupling method.

According to the inductive coupling method, changing the intensity of the current flowing in the primary coil of the two adjacent coils (coil) changes the magnetic field by the current, thereby changing the magnetic flux passing through the secondary coil to the secondary coil side Induced electromotive force is generated. In other words, according to this method, the induced electromotive force is generated by only changing the current of the primary coil with the two coils in close proximity without moving the two conductors spatially. In this case, the frequency characteristics are not significantly affected, but the power efficiency is affected by the alignment and distance between the power transmitter and the power receiver including each coil.

On the other hand, according to the resonance coupling method, some of the magnetic field changes generated by applying the resonance frequency to the primary coil of the two coils apply the secondary coil of the same resonance frequency to generate the induced electromotive force in the secondary coil. do. That is, according to this method, when the transceivers resonate at the same frequency, the electromagnetic waves are transmitted through the near field, so that the energy is not transmitted when the frequencies are different. In this case, the frequency characteristics are greatly affected, but the arrangement and distance between the transmitter and the receiver including each coil have less influence on the power efficiency than the inductive coupling method.

Hereinafter, a method of efficiently transmitting wireless power to the wireless power transmission system according to the resonance coupling method will be described in detail. In particular, as shown in Equation 1 shown below, according to the resonance coupling method, the inductance is determined by the distance (d), the length, and the number of rotations between the coils constituting the transmitter and receiver of the wireless power transmission system. The resonance frequency f is determined according to the value of power capacity C determined by L) and the space d between the coil and the area of the coil.

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

As shown in FIG. 1, the wireless power transmitter 100 may include a transmission side resonance power generation unit 130, a transmission side power supply unit 110, and a transmission side control unit 170.

The transmission side resonance power generation unit 130 may generate a resonance power having a predetermined resonance frequency and output the generated resonance power to an external power receiver so that the external power receiver is charged by the resonance power. . That is, the transmission side resonance power generation unit 130 generates the resonance power by the aforementioned resonance coupling method, and for this purpose, the transmission side including the resonance coil L1 and the resonance capacitor C (not shown). And a transmission side signal processing unit 131 for processing signals such as modulating / demodulating a signal applied to the resonance power generation unit 135 and the transmission side resonance power generation unit 135. Here, the transmission side resonance power generation unit 130 may further include a resonance frequency changing unit 133 for changing the resonance frequency value of the transmission side resonance power generation unit 135. That is, the resonance frequency changing unit 133 may include, for example, a motor capable of changing the value of the capacitance C of the resonance capacitor by adjusting the distance of the resonance capacitor included in the transmission side resonance power generator 135. have. Alternatively, the transmission side resonance power generating unit 135 may include a motor capable of changing the value of the capacitance L1 of the coil by adjusting the number of turns of the resonance coil or the diameter of the coil.

The transmission side power supply unit 110 may supply power to the transmission side resonance power generation unit 130 to drive the transmission side resonance power generation unit 130.

The transmitter control unit 170 controls each component included in the wireless power transmitter 100. That is, the transmitter side control unit 170 may control the transmitter side power supply unit 110 to supply power to the transmitter side resonance power generator 130, and accordingly, the transmitter side resonance power generator 130 is driven to A resonance signal having a predetermined resonance frequency value may be generated and controlled to be transmitted to the wireless power receiver 200. In this case, the resonance signal may include a resonance power, and may include a signal having a transmission packet for transmitting to the wireless power receiver together with or separately from the resonance power.

In this case, according to an embodiment of the present invention, the wireless power transmission apparatus 100 further includes a communication unit (not shown), which will be described later through the communication unit, a wake-up signal, a detection signal, a response signal for a detection signal, and a charge related information request. A signal, an authentication information request signal, a power state confirmation signal, an end signal, and response signals thereof may all be transmitted and received.

However, according to the preferred embodiment of the present invention, the wireless power transmission apparatus 100 does not include a communication unit separately, and instead of the communication unit, the transmitting signal processor 131 is an A / D converter, a D / A converter, an encoding unit, At least one of the decoder and the demodulator may modulate the aforementioned resonance signal and output predetermined data to the wireless power receiver 200 through the transmission side resonance power generator 135. In addition, the transmitting side signal processor 131 may process data received from the wireless power receiver 200. Here, the transmitting side signal processor 131 may generate a detection signal, a charging related information request signal, an authentication information request signal, a power state confirmation signal, and an end signal and output the generated signal to the wireless power receiver 200, and outputs resonance power. While not transmitting, the resonance power and the transmission-side resonance power generator 135 may control to output a signal including the above-described data at the same resonance frequency. In addition, the transmitting side signal processing unit 131 also processes the detection signal response signal, charging related information, authentication information, power status information, and termination signal response signal received from the wireless power receiver 200 and transmits the result. And transmit to 170.

In addition, the wireless power receiver 200 according to the present invention may include a charging unit 210, the receiving side resonance power processing unit 230 and the receiving side control unit 270. That is, the reception side resonance power processor 230 according to the present invention is received from the resonance power receiver 235 and the resonance power receiver 235 for receiving a resonance signal having a predetermined resonance frequency from the wireless power transmitter 100. And a receiver side signal unit for processing the resonance signal. Here, the resonance power receiver 235 includes a receiving side resonance coil L2 and a not shown receiving side resonance capacitor C, and the resonance frequencies of the receiving side resonance coil L2 and the receiving side resonance capacitor are wireless power reception. Matches the resonant frequency of the resonant signal transmitted from the device 200.

In addition, when the wireless power receiver 200 receives the resonance power, the charging unit 210 receives the resonance power processed by the reception side signal processor 231 to perform charging. In addition, although not shown, the wireless power receiver 200 according to the present invention may include a receiving side power supply for supplying power to each component. The reception side controller 270 controls each component included in the wireless power receiver 200 similarly to the transmission side controller 170.

Here, when the wireless power transmitter includes a communication unit according to an embodiment of the present invention, the wireless power receiver 200 may further include a communication unit (not shown) to transmit and receive the above-described data with the wireless power transmitter.

However, according to the preferred embodiment of the present invention, the receiving side signal processing unit 231 also includes at least one of an A / D converter, a D / A converter, an encoding unit, a decoding unit, and a demodulation unit like the transmitting side signal processing unit 131. It may process the resonance signal received from the wireless power transmission apparatus. In addition, according to an embodiment of the present invention, the transmitter control unit and the receiver control unit may include at least one of a microcomputer and a digital signal process.

2 is a simplified circuit diagram of a transmission side resonant power generation unit 130 and a transmission side power supply unit 110 of the wireless power transmission apparatus 100 according to the present invention and a simplified view of a wireless power reception apparatus 200 receiving a resonance power. It is a circuit diagram.

값을 갖고 공진 커패시터가

값을 갖는 경우 이를 수학식 1에 대입하면 공진주파수 값을 구할 수 있다. 또한, 공진전력수신장치의 공진코일 및 공진커패시터에 의한 공진주파수 값 역시 동일한 경우 공진전력전송장치의 공진코일과 공진전력수신장치의 공진코일의 거리가 유도전력에 따른 1차코일 및 2차코일에 비하여 거리가 멀고 배열이 어긋나 있어도 공진전력이 전송될 수 있다.As described above with respect to the resonance coupling, the resonance frequency is determined according to the values of the transmission side resonance power generator 135 and the resonance power generator 135 of the resonance capacitor. Therefore, the resonance coil

Value and the resonant capacitor

In case of having a value, the resonance frequency can be obtained by substituting this value into Equation 1. In addition, when the resonance frequency of the resonance power receiver and the resonance frequency of the resonance capacitor are the same, the distance between the resonance coil of the resonance power transmitter and the resonance coil of the resonance power receiver is equal to the primary coil and the secondary coil according to the induced power. In comparison, the resonance power can be transmitted even if the distance and the arrangement are different.

3 and 4 are control flow diagrams briefly illustrating a transmission and reception procedure between the wireless power transmitter 100 and the wireless power receiver 200 according to the present invention.

As shown in FIG. 3 and FIG. 4, the wireless power transmitter 100 according to the present invention recognizes whether the wireless power receiver 200 is located outside, and recognizes the wireless power receiver 200. In operation S130, the wireless power receiver 200 requests charging related information. In response, the wireless power receiver 200 transmits a charging response signal including charging related information to the wireless power transmitter 100 (S210), and the wireless power transmitter 100 receives the corresponding charging response signal. If so, each component of the wireless power transmitter 100 may be controlled based on the corresponding charging response signal. That is, the transmitting side controller 170 of the wireless power transmitter 100 generates the resonance power based on the charging related information and outputs the generated resonance power to the wireless power receiver 200 so as to output the generated resonance power to the wireless power receiver 200. 130 may be controlled (S150). Then, the wireless power receiver 200 receives the resonance power through the resonance power receiver 235 to start charging the charger 210 (S230), and the receiving side controller 270 is in the state of charge of the charger 210. Detect and check whether the charging is complete (S250). Therefore, when it is determined that the charging is completed, the wireless power receiver 200 transmits a status signal indicating that the charging is completed to the wireless power transmitter 100 (S270), and receives the corresponding state signal. 100 stops the generation and transmission of the resonance power (S170) and terminates the wireless power transmission process.

That is, as shown in FIG. 4, the wireless power transmitter 100 and the wireless power receiver 200 according to the present invention undergo a recognition step (INQUIRY) step to recognize each other. Here, the recognition step is performed in the step before S110 of FIG. Thereafter, when the wireless power transmitter 100 recognizes the wireless power receiver 200, each device goes through an authentication step and a connection step. Here, the authentication step and the connection step corresponds to the steps S130 and S210 of FIG. Thereafter, the wireless power transmitter 100 and the wireless power receiver 200 transmit and receive resonant power through a transmitter / receiver and check the state of charge of each other. Here, the transmitting and receiving steps correspond to the steps S150, S230, S250, and S270 of FIG. Finally, the wireless power transmitter 100 and the wireless power receiver 200 terminate the operation while going through the end of the communication (Close).

5 to 10 are control flowcharts specifically illustrating the above-described recognition step, authentication step, connection step, transmission and reception step. 5 to 10, the communication between the transmitting side controller 170 and the transmitting side resonance power generation unit 130 and the communication between the receiving side controller 270 and the receiving side resonance power processing unit 230 are illustrated by solid lines. Communication between the transmitter 100 and the wireless power receiver 200, that is, RF communication is shown by a dotted line.

5 is a control flowchart of a recognition step according to an embodiment of the present invention. That is, the wireless power transmitter 100 periodically outputs a detection signal in order to recognize whether the wireless power receiver 200 is externally present, and when a response signal for the detection signal is received, the wireless power receiver. 200 can be recognized. In this case, the sensing response signal may be a signal in which the frequency of the sensing signal is shifted or the amplitude is changed.

Specifically, the recognition step is performed as follows. In the wireless power transmitter 100 according to the present invention, the transmitter-side controller 170 and the transmitter-side resonance power generator 130 check the state of each other. In this case, the transmitting side controller 170 may determine whether the transmitting side resonance power generation unit 130 is in a chargeable state. That is, when the transmission side control unit 170 requests the transmission side resonance power generation unit 130 (Cmd_Host_Status) (1101: Cmd_Host_Status), the transmission side generation power generation unit sends the status information in response to the transmission side control unit 170. (1103: Evt_Command_Status). In addition, the wireless power transmitter 100 periodically or aperiodically outputs a detection signal for detecting whether the wireless power receiver 200 is external (1301: Detection of device). In this case, when the wireless power receiver 200 is detected, a signal indicating that the wireless power receiver 200 is detected is input again to the wireless power transmitter 100. At this time, in order to inform that the wireless power receiver 200 is detected, the frequency of the above-described detection signal may be shifted and input to the wireless power transmitter 100 (Resonance shift). Then, the transmitting side controller 170 controls the transmitting side resonance power generating unit 130 to transmit the request signal to the wireless power receiving apparatus 200 (Cmd_Inquiry), and the transmitting side resonance power generating unit 130 The request signal is transmitted to the wireless power receiver 200 (1305: Inquiry). The wireless power receiver 200 receiving the request signal from the wireless power transmitter 100 checks each other's statuses between the receiving controller 270 and the receiving resonance power processor 230 (1201, 1203: Cmd_Device_Status, Evt_Device_Result). In this case, the receiving side controller 270 and the receiving side resonance power processor 230 may check the charging state of the charging unit 210. Thereafter, the receiving side controller 270 may control the receiving side resonance power processor 230 to output the request response signal for the request signal to the wireless power transmitter 100 (1205 and 1307: Cmd_Inquiry Response, Inquiry). Response). Then, the wireless power transmitter 100 notifies the transmitting control unit that the request response signal has been received (1107: Evt_Device_Result), and the wireless power receiving apparatus 200 informs the receiving control unit 270 that the request response signal has been output. Notified (1207: Evt_Inquiry_Result).

On the other hand, Figure 6 is a control flowchart of the recognition step in accordance with another embodiment of the present invention. That is, the method for recognizing whether the wireless power transmitter 100 is external to the wireless power receiver 200 may be provided as follows. That is, the wireless power transmitter 100 is provided in a standby state and wirelessly. The power receiver 200 may transmit a detection signal to the outside. At this time, when the wireless power transmitter 100 receives the corresponding detection signal, the wireless power transmitter 100 recognizes the wireless power receiver 200. In addition, when the wireless power transmitter 100 recognizes the wireless power receiver 200, the transmission control unit 170 ends the standby state and generates and outputs resonance power to the wireless power receiver 200. Each component can be activated.

Specifically, the recognition step according to FIG. 6 is performed as follows. When the wireless power transmitter 100 does not communicate with the wireless power receiver 200, the wireless power transmitter 100 is in a standby mode. The wireless power receiver 200 outputs a predetermined detection signal periodically or aperiodically (2301: Wake up), and the detection signal operates as a wake up signal to the wireless power transmitter 100. . That is, the wireless power transmitter 100 terminates the standby mode when the detection signal is received, and the transmission control unit activates each component. When the wakeup signal is received as shown in FIG. 6, the wireless power transmitter 100 may transmit a response signal to the wireless power receiver 200 to the wireless power receiver 200 (Wake up Response). However, instead of selectively transmitting the response signal to the wake-up signal, only a request signal (Inquiry) to be described later may be transmitted. When the standby mode ends, the wireless power transmitter 100 internally checks the state of the transmitter side control unit 170 and the transmitter side resonance power generation unit 130. That is, when the transmission side control unit 170 requests the status information from the transmission side resonance power generation unit 130 (Cmd_Host_Status), the transmission side power generation unit sends the status information to the transmission side control unit 170 in response thereto. (2103: Evt_Command_Status). In addition, the transmitter-side controller 170 controls the transmitter-side resonance power generator 130 to transmit the request signal to the wireless power receiver 200 (Cmd_Inquiry), and the transmitter-side resonance power generator 130 The request signal is transmitted to the wireless power receiver 200 (2305: Inquiry). The wireless power receiver 200 receiving the request signal from the wireless power transmitter 100 checks each other's states between the receiving controller 270 and the receiving resonance power processor 230 (2201, 2203: Cmd_Device_Status, Evt_Device_Result), and outputs a request response signal for the request signal to the wireless power transmitter 100 (2205, 2307: Cmd_Inquiry Response, Inquiry Response). Then, the wireless power transmitter 100 notifies the transmitting control unit that the request response signal has been received (2107: Evt_Device_Result), and the wireless power receiving apparatus 200 informs the receiving control unit 270 that the request response signal has been output. Notify (2207: Evt_Inquiry_Result).

7 is a control flowchart of the authentication step according to an embodiment of the present invention.

In the authentication step according to an embodiment of the present invention, the wireless power transmitter 100 authenticates whether the wireless power receiver 200 is a device to be charged, that is, a registered device. Specifically, in the wireless power transmitter 100 according to the present invention, the transmitter-side control unit 170 and the transmitter-side resonant power generator 130 check the state of each other (3101, 3103). Then, the transmitting side controller 170 controls the transmitting side resonance power generation unit 130 to request authentication information (3105), and accordingly, the transmitting side resonance power generation unit 130 transmits to the wireless power receiving apparatus 200. The authentication information request information is output (3301). Then, the receiving side control unit 270 of the wireless power receiving apparatus 200 checks the state of the receiving side resonance power processing unit 230 such as checking whether it can respond to the authentication information request information (3201, 3203, the reception side resonance power processing unit 230 controls to output the authentication signal to the wireless power transmission apparatus 100 (3205, 3305). Here, the authentication information includes information on the ID of the wireless power receiver 200, whether or not it can be charged, etc. The transmitting side controller 170 of the wireless power transmitter 100 may be configured based on the ID of the wireless power receiver 200. Authentication can be performed. In addition, the wireless power transmitter 100 may notify the control unit that the authentication information has been received (3107: Evt_Device_Result), and the wireless power receiver 200 may inform the receiving controller 270 that the authentication information has been output. (3207: Evt_Inquiry_Result).

8 is a control flowchart of the connection step according to an embodiment of the present invention.

In the wireless power transmitter 100 according to the present invention, the transmitter-side controller 170 and the transmitter-side resonant power generator 130 check each other's states (4101 and 4103). Here, the transmitting side controller 170 may check a state of whether the transmitting side resonance power generation unit 130 may transmit charging related information. In addition, the transmitter-side controller 170 controls the transmitter-side resonance power generator 130 to generate and output a charge related information request signal for requesting charge related information (4105 and 4301). Here, the charging related information may include at least one of voltage, power, and resonant frequency of resonant power required for charging. When the wireless power receiver 200 receives the charging related information request signal, the receiving controller 270 and the receiving resonance power processor 230 check the state of each other (4201, 4203), and the voltage, power, Determine information necessary for charging such as resonant frequency. The reception side controller 270 controls the reception side resonance power processor 230 to transmit the charging related information to the wireless power transmitter 100 based on the determination result (4205 and 4303). When the transmitting side resonance power generation unit 130 receives the corresponding charging related information, the transmitting side resonance power generation unit 130 transmits the received charging related information to the transmitting side control unit 170 (4107). The transmitter side controller 170 controls the transmitter side resonance power generation unit 130 to output a connection confirmation signal to confirm whether the wireless power receiver 200 is ready to receive the resonance power (4109). Accordingly, the transmission side resonance power generation unit 130 outputs the connection confirmation signal (ReadyRx) to the wireless power receiver 200 (4305), and the wireless power receiver 200 receives the received control unit 270 And after determining whether the resonance power processing unit 230 is ready to receive the resonance power (4209, 4211), and when it is determined that the resonance power is ready to be received, the reception side controller 270 receives the reception side. The resonance power processor 230 controls to output the connection acknowledgment signal (4209). Accordingly, the reception side resonance power processor 230 outputs the connection acknowledgment signal to the wireless power transmission apparatus 100 (4207), and the reception side resonance power generation unit 130 receives the wireless power reception apparatus 200. Informs the transmitting side control section 170 that it is ready to receive the resonance power (4113). In addition, the wireless power transmitter 200 may allocate an address to the wireless power receiver 200 and transmit the address to the wireless power receiver 200. At this time, if the wireless power receiver 200 is a device that has not been previously assigned an address, the wireless power transmitter 100 may receive the aforementioned charging related information and then transmit the address to the wireless power receiver 200. . In this case, the wireless power transmitter may transmit the address information allocated together with the connection confirmation signal ReadyRx to the wireless power receiver 200.

9 is a control flowchart of a transmission and reception step according to an embodiment of the present invention.

In the wireless power transmitter 100 according to the present invention, the transmitter side controller 170 and the transmitter side resonance power generation unit 130 check states of each other (5101, 5103), and the transmitter side controller 170 The transmission side resonance power generation unit 130 determines whether the resonance power is ready to output to the wireless power receiver 200. As a result, when the transmission side resonance power generation unit 130 is ready to output the resonance power, the transmission side control unit 170 may convert the resonance power generated by the transmission side resonance power generation unit 130 into the wireless power receiver ( Control to output to 200) (5105). Accordingly, the transmission side resonance power generation unit 130 outputs the resonance power (5303). In addition, the transmission-side resonant power generation unit 130 periodically outputs a power state confirmation signal for confirming the state of the wireless power receiver 200 to the wireless power receiver 200. This may continuously check the power state because the transmission voltage of the resonance power to be output from the wireless power transmission apparatus 100 may be changed according to the charging degree of the wireless power receiving apparatus 200. That is, since the load amount varies depending on the state of charge of the wireless power receiver 200, in order to maintain a constant power, the voltage size of the resonance power to be transmitted by the wireless power transmitter 100 may vary. That is, the wireless power transmitter 100 may periodically output the power status check signal to check the charging status. In addition, the power status check information may also include charging completion information on whether the charging is completed. Here, the power state confirmation signal may be output to the wireless power receiver 200 at the same resonance frequency together with the resonance power. Then, when the receiving side resonance power processor 230 receives the resonance power signal, the receiving side resonance power processor 230 separates the power state check signal from the received resonance power signal and outputs only the resonance power to the charging unit 210. Charging may be performed. In addition, the receiving side resonance power processor 230 transmits the power state confirmation signal separated from the resonance power signal to the receiving side controller 270. Then, the receiving side controller 270 and the receiving side resonance power processor 230 check each other's state (5201, 5203), and the receiving side controller 270 receives the power side information from the receiving side resonance power processor 230. Control to generate and output (5205, 5305). In addition, the wireless power transmitter 100 may inform the transmitting side controller that power state information has been received (5107), and the wireless power receiver 200 may inform the receiving side controller 270 that the power state information has been output. There is (5207). Here, the transmitter side controller transmits the resonance side power generation unit 130 to adjust the state of the resonance power to be transmitted to the wireless power receiver 200 based on the received power state information, that is, for example, the voltage magnitude of the resonance power. ) Can be controlled.

10 is a control flowchart of an end step according to an embodiment of the present invention.

In the wireless power transmission apparatus 100 according to the present invention, the transmitting side controller 170 and the transmitting side resonance power generation unit 130 may check the state of each other (6101, 6103). In addition, the transmitting side controller 170 of the wireless power transmitter 100 no longer needs to output the resonance power due to the completion of the charging of the wireless power receiver 200 according to the power state information described with reference to FIG. 9. If it is determined, the transmitting side controller 170 controls the transmitting side resonance power generation unit 130 to no longer generate the resonance power. According to an embodiment of the present invention, the transmission side controller 170 controls the transmission side resonance power generation unit 130 to stop the output of the resonance power and outputs a termination signal to the wireless power reception device 200. The transmission side resonance power generation unit 130 is controlled (6105 and 6301). The receiving side resonance power processor 230 outputs the termination signal to the receiving side controller 270 and receives the receiving side resonance power processor 230 so that the receiving side controller 270 receives the termination response. The side resonance power processor 230 ends the connection with the wireless power transmitter 100. Here, the wireless power transmitter 100 may not separately request a signal for the termination response of the wireless power receiver 200 as necessary. That is, the wireless power receiver 200 may terminate the connection without sending a signal for the end response, and the wireless power transmitter 100 also outputs only the end signal to the wireless power receiver 200 without a signal for the end response. You can then terminate the connection.

Accordingly, when the wireless power transmitter 100 and the wireless power receiver 200 that transmit and receive wireless power by the resonance coupling method according to the present invention are approached within a predetermined range, the wireless power transmitter 100 is wireless. The power receiver 200 may be recognized and charged if it is determined that the wireless power receiver 200 needs to be charged. That is, in the resonance coupling method, since the wireless power transmitter 100 and the wireless power receiver 200 do not necessarily need to be adjacent to each other, the wireless power transmitter 100 communicates with each other about the necessity of charging each other if it is located within a certain chargeable distance. It is possible to determine whether or not to perform charging.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

Claims (15)

In the wireless power transmission method for transmitting power wirelessly,
Recognizing an external device;
Requesting charging related information from the external device when the external device is recognized;
Receiving a charge response signal including the charge related information corresponding to the charge related information from the external device;
Generating resonance power based on the charge response signal including the charge related information;
And wirelessly outputting the resonance power to the external device. The method of claim 1,
Recognizing the external device,
Periodically outputting a detection signal;
And receiving a detection response signal with respect to the detection signal. The method of claim 2,
The detection response signal is a wireless power transmission method, characterized in that the frequency of the detection signal is shifted. The method of claim 1,
Recognizing the external device,
Receiving a detection signal from a predetermined external device;
And controlling the control unit to generate the resonance power when the detection signal is received. The method according to any one of claims 1 to 4,
Outputting an authentication request signal to the external device when the detection signal is received;
Receiving an authentication response signal corresponding to the authentication request signal;
And determining whether the external device can be charged based on the authentication response signal. The method according to any one of claims 1 to 4,
The charging related information includes at least one of the resonance frequency, voltage and power of the resonance power required for charging the external device. The method according to any one of claims 1 to 4,
Outputting a status check request signal for checking a charging state while outputting the resonance power;
Generating the resonance power,
And controlling the state of the resonance power based on the state check signal received in response to the state check request signal. The method of claim 7, wherein
The status confirmation signal includes charging completion information that the charging of the external device is completed,
And generating and outputting the resonance power when the charging completion information is received. In the wireless power charging method for performing the charging with the power received wirelessly,
Recognizing an external wireless power transmitter for generating wireless power;
Receiving a request signal for requesting charging related information from the external wireless power transmitter;
Outputting a charge response signal including the charge related information corresponding to the request signal to the external wireless power transmitter;
Receiving resonance power generated based on the charging response signal from the external wireless power transmitter;
And charging by the resonance power. 10. The method of claim 9,
Recognizing the external wireless power transmitter,
Receiving a predetermined detection signal from the external wireless power transmitter;
And outputting a detection response signal for the detection signal to the external wireless power transmission device. 10. The method of claim 9,
Recognizing the external wireless power transmitter,
Outputting a predetermined detection signal;
And receiving a signal upon detection response corresponding to the detection signal from a predetermined external wireless power transmission device. 12. The method according to any one of claims 9 to 11,
The charging related information comprises at least one of the resonance frequency, voltage and power of the resonance power required for charging the external device. In the wireless power transmission device for transmitting power wirelessly,
A resonance power generation unit generating resonance power at a predetermined resonance frequency and transmitting the generated resonance power to an external device;
A power supply unit supplying power to the resonance power generation unit;
Recognizing a predetermined external device, if the external device is recognized, requesting the charging related information from the external device, and based on the charging response signal including the charging related information corresponding to the charging related information from the external device And a controller configured to control the resonance power generator to generate resonance power and output the resonance power to the external device. The method of claim 13,
Further comprising a communication unit for transmitting and receiving data,
The controller outputs a request signal for requesting the charging related information through the communication unit, and receives the charging response signal. In the wireless power charging device that performs charging with the power received wirelessly,
A power receiver for receiving a predetermined resonance power;
A charging unit which performs charging based on the resonance power;
Recognizing an external wireless power transmission device for generating the resonance power, when a request signal for requesting charging related information is received from the external wireless power transmission device, the charging response signal including the charging related information corresponding to the request signal And a control unit for controlling the charging unit to perform charging by the resonance power when the resonance power generated based on the charging response signal is received from the external wireless power transmitter through the power receiver. Wireless power charging device comprising a.

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