Method and device for controlling power of multiple devices in wireless power transmission system

Patent metadata

Field	Value
Publication number	US-12322982-B2
Application number	US-202218280375-A
Country	US
Kind code	B2
Filing date	Mar 3, 2022
Priority date	Mar 3, 2021
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

Provided are: a method for establishing out-band communication performed by a wireless power transmitter in a wireless power transmission system; and a device for using same. The method comprises the steps of: transmitting a plurality of pieces of capability information to a plurality of wireless power receivers respectively through in-band communication, wherein each of the plurality of pieces of capability information includes information about whether the wireless power transmitter supports the out-band communication; establishing the out-band communication with the plurality of wireless power transmitters on the basis of the transmission of the plurality of pieces of capability information; and exchanging power control information pertaining to the plurality of wireless power receivers with the plurality of wireless power receivers through the out-band communication.

First claim

What is claimed is:

1. A method for establishing out-band communication in a wireless power transfer system, the method performed by a wireless power transmitter and comprising:
transmitting a plurality of capability information to each of a plurality of wireless power receivers through in-band communication, respectively,
wherein each of the plurality of the capability information includes information for whether the wireless power transmitter supports the out-band communication;
establishing the out-band communication with the plurality of the wireless power receivers based on transmitting the plurality of capability information, respectively; and
exchanging power control information for the plurality of the wireless power receivers with the plurality of the wireless power receivers through the out-band communication,
wherein the exchanging the power control information includes performing renegotiation of a power transfer contract.

2. The method of claim 1 , wherein the performing the renegotiation includes:
receiving a requested load power from at least one wireless power receiver among the plurality of wireless power receivers;
determining a guaranteed load power for the at least one wireless power receiver based on the requested load power; and
performing a power transfer based on the guaranteed load power.

3. The method of claim 1 , wherein the exchanging the power control information includes exchanging information for charging priority.

4. The method of claim 3 , wherein the exchanging the information for the charging priority includes:
receiving information for the charging priority for each of the plurality of the wireless power receivers from the plurality of the wireless power receivers; and
performing a power transfer based on the information for the charging priority.

5. The method of claim 4 , wherein the wireless power transmitter performs renegotiation of a power transfer contract based on the information for the charging priority,
wherein the wireless power transmitter performs the power transfer based on the renegotiation.

6. The method of claim 3 , wherein the exchanging the information for the charging priority includes:
assigning the charging priority to the plurality of the wireless power receivers;
transmitting the information for the charging priority to at least one wireless power receiver among the plurality of the wireless power receivers.

7. The method of claim 6 , wherein in response to the transmitting of the information for the charging priority, the wireless power transmitter receives information for a user-set charging priority from the at least one wireless power receiver.

8. The method of claim 6 , wherein the wireless power transmitter assigns the charging priority based on at least one of i) device type, ii) required power of the device, or iii) battery power.

9. The method of claim 1 , wherein the wireless power transmitter receives charging priority information from the wireless power receiver through the in-band communication.

10. The method of claim 1 , wherein the in-band communication includes communication based on a power signal of wireless power, and
wherein the out-band communication is Bluetooth-based communication.

11. The method of claim 1 , wherein the wireless power transmitter includes a plurality of coils.

12. A wireless power transmitter, comprising:
a power converter related to transferring wireless power to a plurality of wireless power receivers; and
a communicator/controller related to communicating with the plurality of the wireless power receivers and controlling transfer of the wireless power,
wherein the wireless power transmitter is configured to:
transmit a plurality of capability information to each of the plurality of the wireless power receivers through in-band communication, respectively,
wherein each of the plurality of the capability information includes information for whether the wireless power transmitter supports out-band communication;
establish the out-band communication with the plurality of the wireless power receivers based on transmitting the plurality of capability information, respectively; and
exchange power control information for the plurality of the wireless power receivers with the plurality of the wireless power receivers through the out-band communication,
wherein the exchanging the power control information includes performing renegotiation of a power transfer contract.

13. A method for establishing out-band communication in a wireless power transfer system, the method performed by a wireless power transmitter including a plurality of coils and comprising:
transmitting at least one capability information to each of at least one wireless power receiver through in-band communication, respectively,
wherein each of the at least one capability information includes information for whether the wireless power transmitter supports the out-band communication;
establishing the out-of-band communication with the at least one wireless power receiver based on transmitting of the at least one capability information, respectively; and
exchanging power control information related to the at least one wireless power receiver and the plurality of coils through the out-band communication,
wherein the exchanging the power control information includes performing renegotiation of a power transfer contract.

14. The method of claim 13 , wherein the wireless power transmitter transmits information for the plurality of the coils to the at least one wireless power receiver through the in-band communication,
wherein the information for the plurality of the coils includes ID information for each of the plurality of coils.

15. The method of claim 14 , wherein the wireless power transmitter receives the power control information from the at least one wireless power receiver,
wherein the power control information includes information for a plurality of power levels of the at least one wireless power receiver for each of the plurality of the coils.

16. The method of claim 15 , wherein the wireless power transmitter selects a specific coil having a maximum power level among the plurality of the coils based on the power control information,
wherein the wireless power transmitter performs power transfer to the at least one wireless power receiver based on the specific coil.

17. The method of claim 15 , wherein the power control information includes information for a charging priority of the at least one wireless power receiver.

18. The method of claim 15 , wherein the power control information includes an ID for the at least one wireless power receiver.

Assignees

• Lg Electronics Inc

Inventors

• Lee Minsoo
• Yook Gyunghwan
• Youn Jinho
• Kwon Taewook
• Park Yongcheol

Classifications

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• H04L9/40

  Network security protocols · CPC title