Method for avoiding signal collision in wireless power transfer

• US 10,700,530 B2
• Filed: 10/22/2018
• Issued: 06/30/2020
• Est. Priority Date: 06/29/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Jaesung, Park, Yongcheol, Lee, Jun
• Primary Examiner(s): Borroto, Alfonso Perez
• Assistant Examiner(s): Yeshaw, Esayas G
• Application Number:
  US16/167,094
• Publication Number:
  US 20190058332A1
• Time in Patent Office: 617 Days
• 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 50/80 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence

Abstract

A wireless power transmitter, includes a power conversion unit configured to form a wireless power for power transmission; and a power transmission control unit configured to control the power conversion unit to detect a collision between a first packet generated by a first wireless power receiver and a second packet generated by a second wireless power receiver in a same time slot, and control the power conversion unit to transmit information indicating the collision to the first wireless power receiver and the second wireless power receiver.

Claims

1. A wireless power transmitter, comprising:

a power conversion unit for forming wireless power for power transmission via magnetic coupling between the power conversion unit and a wireless power receiver; and

a power transmission control unit for;

controlling the power conversion unit to detect a collision between a first packet generated by a first wireless power receiver and a second packet generated by a second wireless power receiver in a same time slot, and

controlling the power conversion unit to transmit information indicating the collision to the first wireless power receiver and the second wireless power receiver.

2. The wireless power transmitter of claim 1, wherein the power transmission control unit controls the power conversion unit to detect at least one of the first packet regenerated by the first wireless power receiver and the second packet regenerated by the second wireless power receiver in at least one time slot after transmitting the information.

3. The wireless power transmitter of claim 2, wherein the power transmission control unit controls the power conversion unit to detect the first packet regenerated by the first wireless power receiver at a first time slot after transmitting the information, and to detect the second packet regenerated by the second wireless power receiver at a second time slot after transmitting the information.

4. The wireless power transmitter of claim 3, wherein the first time slot is selected based on a first random number by the first wireless power receiver, and the second time slot is selected based on a second random number by the second wireless power receiver.

5. The wireless power transmitter of claim 3, wherein the power transmission control unit controls the power conversion unit to detect the first packet periodically at the first time slot, and to detect the second packet periodically at the second time slot.

6. A wireless power receiver, comprising:

a power receiving unit for receiving wireless power from a wireless power transmitter via magnetic coupling between the power receiving unit and the wireless power transmitter; and

a power reception control unit for;

controlling the power receiving unit to generate a first packet for the wireless powertransmitter, and

controlling the power receiving unit to receive information indicating a collision between the first packet and a second packet from another wireless power receiver is detected in a same time slot from the wireless power transmitter.

7. The wireless power receiver of claim 6, wherein the power reception control unit controls the power receiving unit to regenerate the first packet for the wireless power transmitter at a first time slot after receiving the information.

8. The wireless power receiver of claim 7, wherein the power reception control unit selects the first time slot based on a first random number.

9. The wireless power receiver of claim 7, wherein the power transmission control unit controls the power conversion unit to generate the first packet periodically at the first time slot.

10. A method of avoiding signal collision by a wireless power receiver, the method comprising:

receiving wireless power from a wireless power transmitter via magnetic coupling between the wireless power receiver and the wireless power transmitter;

generating a first packet for the wireless power transmitter, and

receiving information indicating a collision between the first packet and a second packet from another wireless power receiver is detected in a same time slot from the wireless power transmitter.

11. The method of claim 10, further comprising:

regenerating the first packet for the wireless power transmitter at a first time slot after receiving the information.

12. The method of claim 11, further comprising:

selecting the first time slot based on a first random number.

13. The method of claim 11, further comprising:

generating the first packet periodically at the first time slot.