Method and apparatus for wirelessly charging multiple wireless power receivers

1. A wireless power transmitter for transmitting wireless power to at least one wireless power receiver, the wireless power transmitter comprising:

a communication unit that receives power management information from each of the at least one wireless power receiver, wherein the power management information includes a power capacity of each of the at least one wireless power receiver; and

a controller that:

analyzes the power management information,

identifies whether an output capacity of the wireless power transmitter is greater than a total sum of the power capacities of the at least one wireless power receiver,

selects a charging priority identifying method for identifying a charging priority of the at least one wireless power receiver from a plurality of charging priority identifying method candidates, if the output capacity of the wireless power transmitter is less than or equal to the total sum of the power capacities of the at least one wireless power receiver,

identifies the charging priority of each of the at least one wireless power receiver according to the selected charging priority identifying method, and

identifies at least one wireless power receiver to be charged according to the charging priority of the at least one wireless power receiver.

2. The wireless power transmitter of claim 1 , further comprising a wireless power transmission unit that transmits the wireless power for charging the at least one wireless power receiver.

3. The wireless power transmitter of claim 2 , wherein the controller controls the wireless power transmission unit to supply power to all of the at least one wireless power receiver, if the output capacity of the wireless power transmitter is greater than the total sum of the power capacities of the at least one wireless power receiver.

4. The wireless power transmitter of claim 1 , wherein the controller controls the wireless power transmission unit to transmit charging control signals to the selected at least one wireless power receiver to be charged, and

wherein the charging control signals control the selected at least one wireless power receiver to be charged to prepare to be charged.

5. The wireless power transmitter of claim 1 , wherein the controller controls the wireless power transmission unit to transmit charging control signals to a non-selected wireless power receiver, and

wherein the charging control signals control the non-selected wireless power receiver to disable their charging functions.

6. The wireless power transmitter of claim 1 , wherein the power management information further includes charging priority information of the wireless power receiver, and

wherein the controller identifies a wireless power receiver having a top charging priority to be charged.

7. The wireless power transmitter of claim 6 , wherein the controller controls the wireless power transmission unit to transmit wireless power charging control signals to the at least one wireless power receiver, other than the wireless power receiver having the top charging priority, and

wherein the charging control signals control the at least one wireless power receiver, other than the wireless power receiver having the top charging priority, to disable their charging functions.

8. The wireless power transmitter of claim 1 , wherein the power management information further includes at least one of remaining battery power, charging count, consumption, battery capacity, and remaining battery power/capacity ratio, and

wherein the controller identifies the at least one wireless power receiver to be charged, based on the at least one of the remaining battery power, the charging count, the consumption, the battery capacity, and the remaining battery power/capacity ratio.

9. The wireless power transmitter of claim 8 , wherein the controller further identifies the at least one wireless power receiver to be charged, based on a remaining battery power order, based on a lower charging count order, based on a higher consumption order, based on a higher battery capacity order, or based on a lower remaining battery power/capacity order.

10. A method for transmitting, by a wireless power transmitter, wireless power to at least one wireless power receiver, the method comprising:

receiving power management information from each of the at least one wireless power receiver, wherein the power management information includes a power capacity of each of the at least one wireless power receiver;

identifying whether an output capacity of the wireless power transmitter is greater than a total sum of the power capacities of the at least one wireless power receiver,

selecting a charging priority identifying method for identifying a charging priority of the at least one wireless power receiver from a plurality of charging priority identifying method candidates, if the output capacity of the wireless power transmitter is less than or equal to the total sum of the power capacities of the at least one wireless power receiver,

identifying the charging priority of each of the at least one wireless power receiver according to the selected charging priority identifying method, and

identifying at least one wireless power receiver to be charged according to the charging priority of the at least one wireless power receiver.

11. The method of claim 10 , further comprising transmitting the wireless power for charging all of the at least one wireless power receiver, if the output capacity of the wireless power transmitter is greater than the total sum of the power capacities of the at least one wireless power receiver.

12. The method of claim 10 , further comprising transmitting charging control signals to the selected at least one wireless power receiver to be charged,

wherein the charging control signals control the selected at least one wireless power receiver to be charged to prepare to be charged.

13. The method of claim 12 , further comprising transmitting the wireless power for charging the selected at least one wireless power receiver to be charged.

14. The method of claim 10 , further comprising transmitting charging control signals to a non-selected wireless power receiver,

wherein the charging control signals control the non-selected wireless power receiver to disable their charging functions.

15. The method of claim 10 , wherein the power management information further includes charging priority information of the at least one wireless power receiver, and

wherein the method further comprises identifying a wireless power receiver having a top charging priority to be charged.

16. The method of claim 15 , further comprising transmitting wireless power charging control signals to the at least one wireless power receiver, other than the wireless power receiver having the top charging priority,

wherein the charging control signals control the at least one wireless power receiver, other than the wireless power receiver having the top charging priority, to disable their charging functions.

17. The method of claim 10 , wherein the power management information further includes at least one of remaining battery power, charging count, consumption, battery capacity, and remaining battery power/capacity ratio, and

wherein identifying the at least one wireless power receiver to be charged comprises identifying the at least one wireless power receiver to be charged based on the at least one of the remaining battery power, charging count, consumption, battery capacity, and remaining battery power/capacity ratio.

18. The method of claim 17 , wherein identifying the at least one wireless power receiver to be charged further comprises identifying the at least one wireless power receiver to be charged based on a lower remaining battery power order, based on a lower charging count order, based on a higher consumption order, based on a higher battery capacity order, or based on a lower remaining battery power/capacity order.