Device and method for wirelessly transmitting power on basis of reestablishment of out-band communication

Patent metadata

Field	Value
Publication number	US-11916615-B2
Application number	US-201917310089-A
Country	US
Kind code	B2
Filing date	Dec 2, 2019
Priority date	Jan 16, 2019
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

The present specification relates to a device and method for wirelessly transmitting power on the basis of the reestablishment of out-band communication. The present specification discloses a wireless power receiving device comprising a communication/control circuit configured to carry out the operations of: performing handover from in-band communication using operating frequencies to out-band communication using any frequencies except for the operating frequencies; transmitting power characteristic information to the wireless power transmitting device or receiving power characteristic information from the wireless power transmitting device through the out-band communication before entering a power transmission phase; and saving power state information determined during the power transmission phase. By defining an out-band communication reestablishment protocol for the wireless power transmitting device or wireless power receiving device, it is possible to improve the performance of wireless power transmission throughout-band communication reestablishment that is fast and efficient.

First claim

What is claimed is:

1. A wireless power receiver for receiving wireless power based on an out-band communication, comprising:
a power pickup circuit configured to receive wireless power from a wireless power transmitter based on magnetic coupling with the wireless power transmitter in an operation frequency and transform an alternate current (AC) signal generated by the wireless power to a direct current (DC) signal;
a communication/control circuit configured to be provided with the DC signal from the power pickup circuit, perform a handover to the out-band communication using a frequency except the operating frequency in an in-band communication using the operation frequency, transmit power characteristic information to the wireless power transmitter or receive the power characteristic information from the wireless power receiver based on the out-band communication before entering a power transfer phase, and perform a process of saving power state information determined during the power transfer phase; and
a load configured to receive the direct current from the power pickup circuit.

2. The wireless power receiver of claim 1 , wherein the out-band communication is Bluetooth low energy (BLE), and
wherein the communication/control circuit transmits or receives the power characteristic information based on a generic attribute profile (GATT) of the BLE.

3. The wireless power receiver of claim 1 , wherein the process of saving the power state information includes:
receiving, by the communication/control circuit, a save request message for requesting a saving of the power state information based on the out-band communication from the wireless power transmitter; and
transmitting a save response message for identifying the saving of the power state information to the wireless power transmitter based on the out-band communication.

4. The wireless power receiver of claim 3 , wherein the communication/control circuit includes an in-band communication module configured to perform the in-band communication and an out-band communication module configured to perform the out-band communication, and
wherein the out-band communication module transfers the power state information to the in-band communication module based on the save response message of power information.

5. The wireless power receiver of claim 3 , wherein the save request message includes at least one of device ID information, device address information, power level information, and a public key.

6. The wireless power receiver of claim 1 , wherein the communication/control circuit is configured to perform a process of exchanging the power state information with the wireless power transmitter in a reconnection after a disconnection of the out-band communication.

7. The wireless power receiver of claim 6 , wherein the process of exchanging the power state information includes:
receiving, by the communication/control circuit, a power information request message from the wireless power transmitter;
transmitting a power information response message to the wireless power transmitter; and
performing a power calibration.

8. The wireless power receiver of claim 7 , wherein the power information response message includes at least one of device ID information, device address information, power level information, and a public key.

9. The wireless power receiver of claim 7 , wherein the process of exchanging the power state information further includes:
changing, by the communication/control circuit, a power contract by performing a renegotiation phase with the wireless power transmitter based on the out-band communication.

10. The wireless power receiver of claim 9 , wherein the communication/control circuit is configured to perform a process of saving updated power state information during the renegotiation phase.

11. A wireless power transmitter for performing an authentication based on an out-band communication, comprising:
a power conversion circuit configured to transmit wireless power to a wireless power receiver based on magnetic coupling with the wireless power receiver in an operation frequency; and
a communication/control circuit configured to perform a handover to the out-band communication using a frequency except the operating frequency in an in-band communication using the operation frequency, receive power characteristic information from the wireless power receiver or transmit power characteristic information to the wireless power receiver based on the out-band communication before entering a power transfer phase, and perform a process of saving power state information determined during the power transfer phase.

12. The wireless power transmitter of claim 11 , wherein the out-band communication is Bluetooth low energy (BLE), and
wherein the communication/control circuit transmits or receives the power characteristic information based on a generic attribute profile (GATT) of the BLE.

13. The wireless power transmitter of claim 11 , wherein the process of saving the power state information includes:
transmitting, by the communication/control circuit, a save request message for requesting a saving of the power state information based on the out-band communication to the wireless power receiver; and
receiving a save response message for identifying the saving of the power state information from the wireless power receiver based on the out-band communication.

14. The wireless power transmitter of claim 13 , wherein the communication/control circuit includes an in-band communication module configured to perform the in-band communication and an out-band communication module configured to perform the out-band communication, and
wherein the out-band communication module transfers the power state information to the in-band communication module based on the save response message of power information.

15. The wireless power transmitter of claim 13 , wherein the save request message includes at least one of device ID information, device address information, power level information, and a public key.

16. The wireless power transmitter of claim 11 , wherein the communication/control circuit is configured to perform a process of exchanging the power state information with the wireless power receiver in a reconnection after a disconnection of the out-band communication.

17. The wireless power transmitter of claim 16 , wherein the process of exchanging the power state information includes:
transmitting, by the communication/control circuit, a power information request message to the wireless power receiver;
receiving a power information response message from the wireless power receiver; and
performing a power calibration.

18. The wireless power transmitter of claim 17 , wherein the power information response message includes at least one of device ID information, device address information, power level information, and a public key.

19. The wireless power transmitter of claim 17 , wherein the process of exchanging the power state information further includes:
changing, by the communication/control circuit, a power contract by performing a renegotiation phase with the wireless power receiver based on the out-band communication.

20. The wireless power transmitter of claim 19 , wherein the communication/control circuit is configured to perform a process of saving updated power state information during the renegotiation phase.

Assignees

• Lg Electronics Inc

Inventors

• Lim Jinkwon
• Choi Jingu
• Park Joonho
• Park Yongcheol

Classifications

• H02J7/47

  Arrangements for checking compatibility or authentication between one component, e.g. a battery or a battery charger, and another component, e.g. a power source · CPC title

• H04W36/035

  in self-organising networks · CPC title

• H04B5/0037 Primary

  Electricity · mapped topic

• H02J7/00045

  Electricity · mapped topic

• H02J7/02

  for charging batteries from AC mains by converters · CPC title