Wireless power transmission apparatus and method therefor

1. A wireless power transmitter comprising:

a power transmitting module configured to transmit wireless power using one of a magnetic field of first frequency band and a magnetic field of second frequency band that is different from the first frequency band;

a first communication module;

a second communication module; and

a controller configured to:

transmit a first magnetic field signal of the first frequency band through the power transmitting module;

detect a first response signal regarding the first magnetic field signal through the first communication module;

in response to receipt of the first response signal, search for a first wireless power receiver that transmits and receives wireless power using the first frequency band;

transmit the second magnetic field signal through the power transmitting module;

detect a second response signal regarding the second magnetic field signal through the second communication module; and

in response to receipt of the second response signal, search for a second wireless power receiver that transmits and receives wireless power using the second frequency band.

2. The wireless power transmitter of claim 1 , wherein the first communication module is an in-band communication module using the magnetic field of the first frequency band, and the second communication module is an in-band communication module using the magnetic field of the second frequency band.

3. The wireless power transmitter of claim 1 , wherein the first communication module is an in-band communication module using the magnetic field of the first frequency band, and the second communication module is an out-band communication module that performs communication using a communication carrier different from the magnetic field.

4. The wireless power transmitter of claim 3 , wherein the second communication module is a communication module that performs one of Bluetooth, Zigbee, Wi-Fi, Near Field Communication (NFC), and Radio Frequency Identification (RFID).

5. The wireless power transmitter of claim 1 , wherein the controller is further configured to:

determine that the first wireless power transmitter exists within a wireless power transmission range in the case where the first response signal is received during a first preset time period;

determine that the first wireless power transmitter does not exist within the wireless power transmission range in the case where the first response signal is not received during the first preset time period;

determine that the second wireless power transmitter exits within the wireless power transmission range in the case where the second response signal is received during a second preset time period; and

determine that the second wireless power transmitter does not exist within the wireless power transmission range in the case where the second response signal is not received during the second preset time period.

6. The wireless power transmitter of claim 1 , wherein the controller is further configured to detect the first response signal during a first preset time period after transmitting the first magnetic field signal, and, if the first present time period expires, transmit the second magnetic field signal.

7. The wireless power transmitter of claim 1 , wherein the controller is further configured to, in the case where the first wireless power receiver and the second wireless power receiver are found, assign a first identifier (ID) to the first wireless power receiver and a second ID to the second wireless power receiver.

8. The wireless power transmitter of claim 7 , wherein the controller is further configured to transmit a message including the first ID to the first wireless power receiver through the first communication module and a message including the second ID to the second wireless power receiver through the second communication module.

9. A wireless power transmission method comprising:

transmitting a first magnetic field signal of a first frequency band through a power transmitting module that transmits wireless power by using any one of a magnetic field of the first frequency band and a magnetic field of a second frequency band that is different from the first frequency band;

detecting a first response signal regarding the first magnetic signal through the first communication module;

in response to receipt of the first response signal, searching for a first wireless power receiver that transmits and receives wireless power using the first frequency band;

transmitting a second magnetic signal of the second frequency band through the power transmitting module;

detecting a second response signal regarding for the first magnetic field signal through the second communication module; and

in response to receipt of the second response signal, searching for a second wireless power receiver that transmits and receives wireless power using the second frequency band.

10. The wireless power transmission method of claim 9 , wherein the first communication module is an in-band communication module using the magnetic field of the first frequency band, and the second communication module is an in-band communication module using the magnetic field of the second frequency band.

11. The wireless power transmission method of claim 9 , wherein the first communication module is an in-band communication module using the magnetic field of the first frequency band, and the second communication module is an out-band communication module that performs communication using a communication carrier different from the magnetic.

12. The wireless power transmission method of claim 11 , wherein the second communication module is a communication module that performs one of Bluetooth, Zigbee, Wi-Fi, Near Field Communication (NFC), and Radio Frequency Identification (RFID).

13. The wireless power transmission method of claim 9 ,

wherein the searching for the first wireless power receiver comprises determining that the first wireless power receiver exists in a wireless power transmission range in the case where the first response signal is received during a first preset time period, and determining that the first wireless power receiver does not exist in the wireless power transmission range in the case where the first response signal is not received during the first present time, and

wherein the searching for the second wireless power receiver comprises determining that the second wireless power receiver exists in the wireless power transmission range in the case where the second response signal is received during a second present time period, and determining that the second wireless power receiver does not exists in the wireless power transmission range in the case where the second response signal is not received during the second preset time period.

14. The wireless power transmission method of claim 9 ,

wherein the detecting of the first response signal is performed for a first present time period after transmission of the first magnetic field signal, and

wherein the detecting of the second response signal is performed when a second present time period expires after transmission of the first magnetic field signal.

15. The wireless power transmission method of claim 9 , further comprising:

in a case where the first wireless power receiver and the second wireless power receiver are found, assigning a first identifier (ID) to the first wireless power receiver and a second ID to the second wireless power receiver.

16. The wireless power transmission method of claim 15 , further comprising:

transmitting a message including the first ID to the first wireless power receiver through the first communication module; and

transmitting a message including the second ID to the second wireless power receiver through the second communication module.