APPARATUS AND METHOD FOR TRANSMITTING WIRELESS POWER

• US 20130154387A1
• Filed: 12/17/2012
• Published: 06/20/2013
• Est. Priority Date: 12/15/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Kyung-Woo, Byun, Kang-Ho, Park, Se-Ho
• Granted Patent: US 9,438,074 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A method and a wireless power transmitter are provided for transmitting wireless power to at least one wireless power receiver. The method includes setting, by the wireless power transmitter, a search channel to be used for communication with the at least one wireless power receiver; detecting at least one of an energy level and a Received Signal Strength Indication (RSSI) value of a signal received on the search channel; and determining whether to designate the search channel as a communication channel based on the detection results.

Claims

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

setting, by the wireless power transmitter, a search channel to be used for communication with the at least one wireless power receiver;

detecting at least one of an energy level and a Received Signal Strength Indication (RSSI) value of a signal received on the search channel; and

determining whether to designate the search channel as a communication channel based on the detection results.

2. The method of claim 1, wherein determining whether to designate the search channel comprises:

determining whether the at least one of the energy level and the RSSI value of the received signal is less than a predetermined threshold; and

designating the search channel as the communication channel, when the at least one of the energy level and the RSSI value is less than the predetermined threshold.

3. The method of claim 2, further comprising changing the search channel to another channel, when the at least one of the energy level and the RSSI value of the received signal is greater than or equal to the predetermined threshold.

4. The method of claim 3, further comprising:

determining whether there is a remaining another channel, when at least one of an energy level and an RSSI value of a signal received on the changed search channels is greater than or equal to the threshold; and

increasing the threshold, when there is no remaining another channel.

5. The method of claim 4, further comprising:

determining whether at least one of an energy level and an RSSI value of a signal received on a search channel is less than the increased threshold; and

designating the search channel as the communication channel, if the at least one of the energy level and the RSSI value is less than the increased threshold.

6. The method of claim 1, wherein determining whether to designate the search channel comprises:

detecting at least one of an energy level and an RSSI value of a received signal over each of a plurality of search channels; and

designating, as the communication channel, a search channel from among the plurality of search channels having a smallest at least one of an energy level and an RSSI value.

7. The method of claim 1, further comprising generating a network Identifier (ID) of the wireless power transmitter based on a notice signal received from another wireless power transmitter.

8. The method of claim 7, wherein the network ID is different from a network ID of the another wireless power transmitter.

9. The method of claim 7, further comprising generating a notice signal including the generated network ID, and transmitting the generated notice signal.

10. The method of claim 9, wherein the notice signal further includes at least one of protocol version information, a sequence number, information about a wireless power receiver, and information about a number of wireless power receivers in management.

11. The method of claim 1, further comprising determining a number of other wireless power transmitters that use the search channel, based on the detection results.

12. The method of claim 11, further comprising designating the search channel as the communication channel, when the number of the other wireless power transmitters that use the search channel is less than a predetermined number.

13. The method of claim 11, further comprising designating the search channel as the communication channel, when the search channel energy level is less than a predetermined threshold, and the number of the other wireless power transmitters that use the search channel is greater than or equal to a predetermined number.

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

a controller that sets a search channel to be used for communication with the at least one wireless power receiver; and

a communication unit that receives a signal on the search channel;

wherein the controller detects at least one of an energy level and a Received Signal Strength Indication (RSSI) value of the received signal, and determines whether to designate the search channel as a communication channel, based on the detection results.

15. The wireless power transmitter of claim 14, wherein the controller determines whether the at least one of the energy level and the RSSI value of the received signal is less than a predetermined threshold, and designates the search channel as the communication channel, when the at least one of the energy level and the RSSI value is less than the predetermined threshold.

16. The wireless power transmitter of claim 15, wherein the controller changes the search channel to another channel, if the at least one of the energy level and the RSSI value of the received signal is greater than or equal to the predetermined threshold.

17. The wireless power transmitter of claim 16, wherein the controller determines whether there is a remaining another channel, when at least one of an energy level and an RSSI value of a signal received on the changed search channels is greater than or equal to the threshold, and increases the threshold, when there is no remaining another channel.

18. The wireless power transmitter of claim 17, wherein the controller determines whether at least one of an energy level and an RSSI value of a signal received on a search channel is less than the increased threshold, and determines the search channel as the communication channel, if the at least one of the energy level and the RSSI value is less than the increased threshold.

19. The wireless power transmitter of claim 14, wherein the controller detects at least one of an energy level and an RSSI value of a received signal over each of a plurality of search channels, and designates, as the communication channel, a search channel from among the plurality of search channels having a smallest at least one of an energy level and an RSSI value.

20. The wireless power transmitter of claim 14, wherein the controller generates a network Identifier (ID) of the wireless power transmitter based on a notice signal received from another wireless power transmitter.

21. The wireless power transmitter of claim 20, wherein the network ID is different from a network ID of the another wireless power transmitter.

22. The wireless power transmitter of claim 20, wherein the communication unit generates a notice signal including the generated network ID, and transmits the generated notice signal.

23. The wireless power transmitter of claim 22, wherein the notice signal further includes at least one of protocol version information, a sequence number, information about a wireless power receiver, and information about a number of wireless power receivers in management.

24. The wireless power transmitter of claim 14, wherein the controller determines a number of other wireless power transmitters that use the search channel, based on the detection results.

25. The wireless power transmitter of claim 24, wherein the controller designates the search channel as the communication channel, if the number of the other wireless power transmitters that use the search channel is less than a predetermined number.

26. The wireless power transmitter of claim 24, wherein the controller designates the search channel as the communication channel, when the search channel energy level is less than a predetermined threshold, and the number of the other wireless power transmitters that use the search channel is greater than or equal to a predetermined number.