Two-way communication in wireless power transfer

• US 8,798,537 B2
• Filed: 06/27/2012
• Issued: 08/05/2014
• Est. Priority Date: 06/27/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Jaesung, Park, Yongcheol, Seo, Jeongkyo, Lee, Seonghun, Son, Dohyeon
• Primary Examiner(s): Trinh, Sonny
• Application Number:
  US13/534,996
• Publication Number:
  US 20120329405A1
• Time in Patent Office: 769 Days
• Field of Search: 455/573, 455/343.1, 455/69, 455/41.1, 320/104, 320/108, 340/5.8, 340/455
• US Class Current: 455/41.1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

Disclosed herein is a wireless power transmitter for solving a problem that a collision occurs when recognizing an initial wireless power receiver in two-way communication of wireless power transmission. A wireless power transmitter according to a first embodiment disclosed herein may include a transceiver configured to transmit and/or receive a message to and/or from a wireless power receiver; and a controller configured to control the transceiver to transmit a message for requesting identification information to the wireless power receiver, and determine whether the identification information is validly received from the wireless power receiver by the transceiver in response to the identification information request, and control the transceiver to transmit a message for requesting sleep mode switching to the wireless power receiver when the identification information is validly received by the transceiver.

Claims

1. A wireless power transmitter, comprising:

a transceiver configured to transmit and/or receive a message to and/or from a wireless power receiver; and

a controller configured to control the transceiver to transmit a message for requesting identification information to the wireless power receiver, and determine whether the identification information is validly received from the wireless power receiver by the transceiver in response to the identification information request, and control the transceiver to transmit a message for requesting sleep mode switching to the wireless power receiver when the identification information is validly received by the transceiver.

2. The wireless power transmitter of claim 1, wherein the controller controls the transceiver to transmit a message for requesting identification information to the wireless power receiver again when the identification information is not validly received.

3. The wireless power transmitter of claim 1, wherein the controller is changed to a power transmission state when a response to the identification information request is not received any more.

4. The wireless power transmitter of claim 1, wherein the controller registers the identification information of the wireless power receiver.

5. The wireless power transmitter of claim 1, wherein the controller determines that the identification information is validly received when a first message for receiving identification information from the wireless power receiver is not collided with a second message for receiving identification information from another wireless power receiver.

6. A wireless power transmitter, comprising:

a transceiver configured to transmit and/or receive a message to and/or from a wireless power receiver; and

a controller configured to control the transceiver to transmit a message for requesting identification information to the wireless power receiver, and receive a message containing identification information from a first wireless power receiver in response to the identification information request, and transmit a message for requesting status information to the first wireless power receiver,

wherein the message for requesting status information comprises the identification information of the first wireless power receiver.

7. The wireless power transmitter of claim 6, wherein the controller controls the transceiver to receive a message containing status information from the first wireless power receiver in response to the identification information request from the wireless power receiver.

8. The wireless power transmitter of claim 7, wherein the controller comprises a controller configured to control the transceiver to receive a message containing identification information from a second wireless power receiver in response to the identification information request, and transmit a message for requesting status information to the second wireless power receiver, and

the message for requesting status information comprises the identification information of the second wireless power receiver.

9. The wireless power transmitter of claim 8, wherein the controller controls the transceiver to receive a message containing status information from the second wireless power receiver in response to the identification information request from the wireless power receiver.

10. The wireless power transmitter of claim 8, wherein the first identification information and the second identification information are different from each other.

11. The wireless power transmitter of claim 7, wherein the message containing status information further comprises the identification information of the first wireless power transmitter.

12. The wireless power transmitter of claim 6, wherein the controller registers the identification information of the wireless power receiver.

13. A wireless power transmitter, comprising:

a transceiver configured for transmitting and/or receiving a message to and/or from a wireless power receiver; and

a controller configured to control the transceiver to transmit a message for requesting identification information to the wireless power receiver, and determine whether the identification information is validly received from the first and the second wireless power receiver by the transceiver in response to the request, wherein the identification information is received through a time slot selected by the first and the second wireless power receiver, respectively, among a plurality of time slots, and change the time slot assigned to at least one of the first and the second wireless power receiver when the identification information is not validly received from the first and second wireless power receiver.

14. The wireless power transmitter of claim 13, wherein the controller transmits information on the changed time slot to at least one of the first and second wireless power receiver.

15. The wireless power transmitter of claim 13, wherein the controller controls the transceiver to transmit a message for the identification information to the wireless power receiver again.

16. The wireless power transmitter of claim 13, wherein the controller registers the identification information of the first and second wireless power receiver when the identification information is validly received from the first and second wireless power receiver.

17. The wireless power transmitter of claim 13, wherein the message for requesting identification information comprises the number of the plurality of time slots.

18. The wireless power transmitter of claim 17, wherein the controller waits for a period of time corresponding to the number of the plurality of time slots subsequent to transmitting the message for requesting identification information.

19. The wireless power transmitter of claim 13, wherein the controller is immediately changed to a power transmission state when identification information is validly received from the first and second wireless power receiver.

20. The wireless power transmitter of claim 13, wherein the controller changes a time slot assigned to at least one of the first and second wireless power receiver to a vacant time slot.