Wireless power transmitter and method of wireless power transmission

1. A wireless power transmitter for transmitting wireless power to an electronic device to which a wireless power receiver is applied, the wireless power transmitter comprising:

a power supply unit configured to supply an input voltage;

a receiving unit configured to receive a power-on signal or power-off signal from a remote controller;

a low power transmission controller configured to generate a low power drive signal to supply low power for an operation of the receiving unit based on the input voltage;

a power transmission controller configured to generate a drive signal to supply power for the operation of the electronic device based on the power-on signal; and

a power transmission unit configured to form a wireless power signal based on the supplied voltage and the drive signal to transmit wireless power to the wireless power receiver,

wherein the power transmission controller and power transmission unit are turned off and wireless power transmitted from the wireless power transmitter to the wireless power receiver is blocked until the power on-signal is received when the power off-signal is received, and

wherein the low power transmission controller is not turned off when the power-off signal is received and the low power transmission controller is turned off when the input voltage is not supplied.

2. The wireless power transmitter of claim 1 , wherein the receiving unit receives identification information from the wireless power receiver, receives the power-off signal from the remote controller and turns off the power transmission controller and the power transmission unit when the power-off signal is received from the remote controller before receiving a power control message for requesting suspension of wireless power transfer if charging of the wireless power has been completed.

3. The wireless power transmitter of claim 2 , wherein the power transmission unit further includes a power sensing unit, a resonant circuit, and a frequency adjustment unit,

wherein the frequency adjustment unit changes a capacitance or an inductance of the resonant circuit when the identification information is received,

wherein the inverter, the power sensing unit, and the frequency adjustment unit are turned off when the power-off signal is received, and

wherein the frequency adjustment unit does not change the capacitance or the inductance of the resonant circuit when the power-off signal is received.

4. The wireless power transmitter of claim 1 , further comprising:

a sub-power supply unit configured to apply low power used in the receiving unit.

5. The wireless power transmitter of claim 1 , further comprising:

a sub-power supply unit configured to generate wireless low power based on the supplied voltage, and apply the generated wireless low power to the receiving unit.

6. The wireless power transmitter of claim 1 , further comprising:

a sub-power supply unit configured to convert the supplied voltage to a low voltage, and form a wireless low power signal based on the converted low voltage and a low power drive signal for the operation of the receiving unit to generate wireless low power, and apply the generated wireless low power to the receiving unit.

7. The wireless power transmitter of claim 6 , wherein the receiving unit receives the power-on signal or power-off signal from the remote controller based on the wireless low power applied from the sub-power supply unit.

8. The wireless power transmitter of claim 6 , wherein the sub-power supply unit comprises:

a low power transmission unit configured to convert the voltage supplied from the power supply unit to a low voltage, and form a wireless low power signal based on the converted low voltage and the low power drive signal to transmit wireless low power; and

a low power receiving unit configured to receive the wireless low power transmitted from the low power transmission unit, and apply the received wireless low power to the receiving unit.

9. The wireless power transmitter of claim 1 , wherein the power transmission controller adjusts a transmission rate of the wireless power according to the power usage of the electronic device.

10. The wireless power transmitter of claim 1 , wherein the receiving unit comprises a charging device configured to charge the wireless power output from the wireless power receiver, and supply the charged power to the receiving unit for a period of time in which the wireless power transmitter is turned off.

11. A wireless power transmission method for transmitting wireless power to an electronic device to which a wireless power receiver is applied, the method comprising:

generating, at a low power transmission controller, a low power drive signal to supply low power for an operation of a receiving unit based on an input voltage,

receiving a power-on signal or power-off signal from a remote controller through a receiving unit;

receiving the power-on signal from the remote controller through the receiving unit;

turning on the power transmission controller and the power transmission unit until the power-off signal is received when the power on-signal is received;

generating a drive signal to supply power for the operation of the electronic device based on the power-on signal; and

forming a wireless power signal based on an input voltage and the drive signal to transmit wireless power to the wireless power receiver,

wherein the low power transmission controller is not turned off when the power off-signal is received and the low power transmission controller is turned off when the input voltage is not supplied.

12. The method of claim 11 , wherein said receiving the power-on signal or power-off signal further comprises:

receiving identification information from the wireless power receiver;

receiving the power-off signal from the remote controller; and

turning off the wireless power transmitter when the power-off signal is received from the remote controller before receiving a power control message for requesting suspension of wireless power transfer if charging of the wireless power has been completed.

13. The method of claim 11 , wherein said receiving a power-on signal or power-off signal receives the power-on signal or power-off signal based on an input power source different from the input power.

14. The method of claim 11 , further comprising:

applying low power used in the receiving unit.

15. The method of claim 11 , further comprising:

generating wireless low power based on the input voltage, and applying the generated wireless low power to the receiving unit.