Method and apparatus for controlling wireless power transmission

1. A wireless power transmission control method, comprising:

transmitting a wake-up request signal that is used to wake up a target device;

receiving a response message comprising an identification (ID) of the target device and information about an amount of power to be used by the target device from the target device that is activated by the wake-up request signal;

setting a demand power based on the response message;

transmitting a resonance power to the target device based on the set demand power;

receiving at least one check message including a power receiving state of the target device in real-time; and

adjusting the resonance power based on the check message.

2. The wireless power transmission control method of claim 1 , wherein the wake-up request signal comprises an amount of power used to switch a mode of the target device to a power receiving mode.

3. The wireless power transmission control method of claim 1 , wherein the setting comprises:

demodulating the response message;

verifying an amount of current to be used and an amount of voltage to be used of the target device from the demodulated response message; and

setting the demand power based on the used amount of current and the used amount of voltage.

4. The wireless power transmission control method of claim 3 , wherein the demand power is set based on a number of target devices and a reflected power that is reflected from at least one target device.

5. The wireless power transmission control method of claim 1 , wherein the check message comprises the ID and a power receiving state of the target device.

6. The wireless power transmission control method of claim 5 , wherein the power receiving state comprises at least one of information about a battery charging state, whether a power is turned on or off, a reflected power amount, coupling information, and power consumption information.

7. The wireless power transmission control method of claim 1 , wherein resonance power is transmitted to the target device to supply the target device with a desired amount of power in real-time.

8. A wireless power transmission control apparatus, comprising:

a communication unit configured to transmit a wake-up request signal to wake up a target device, to receive a response message comprising an identification (ID) of the target device and information about an amount of power to be used by the target device from the target device activated by the wake-up request signal, and to receive at least one check message including a power receiving state of the target device in real-time;

a controller configured to set a demand power based on the response message; and

a source resonator configured to transmit resonance power corresponding to the demand power, to the target device,

wherein the controller is further configured to adjust the resonance power based on the check message.

9. The wireless power transmission control apparatus of claim 8 , wherein the wake-up request signal comprises a power used to switch a mode of the target device to a power receiving mode.

10. The wireless power transmission control apparatus of claim 8 , further comprising:

a direct current (DC) level setting unit to set a voltage corresponding to the demand power;

a current setting unit to set a current corresponding to the demand power; and

a resonance power sensor to sense, in real-time, the resonance power transmitted to the target device.

11. The wireless power transmission control apparatus of claim 10 , wherein the resonance power sensor senses the resonance power transmitted to the target device, in real-time, using an alternating current (AC) power that is coupled at a λ/4 point in a radio frequency (RF) line, wherein λ denotes a wavelength of a resonance frequency.

12. A wireless power transmission control apparatus, comprising:

a target resonator operated at a same resonance frequency as a source resonator;

a communication unit configured to receive, from a source device, a wake-up request signal to wake up the power transmission control apparatus, to transmit a response message to the wake-up request signal to the source device, and to transmit at least one check message include a power receiving state of the target device in real-time; and

a controller that is activated by a resonance power comprised in the wake-up request signal, and configured to generate the response message,

wherein the response message comprises an identification (ID) of the power transmission control apparatus and information about an amount of power to be used by the power transmission control apparatus, and

wherein the resonance power is adjusted by the source device in accordance with the check message.

13. The wireless power transmission control apparatus of claim 11 , further comprising:

a coupling state detector to detect a coupling state between the source resonator and the target resonator.

14. The wireless power transmission control apparatus of claim 11 , further comprising:

a charging state detector to detect a charging state of the power transmission control apparatus.

15. The wireless power transmission control apparatus of claim 11 , wherein the controller controls the communication unit to periodically or aperiodically transmit a check message comprising the ID and a power receiving state of the power transmission control apparatus.