Method and apparatus for performing wireless power transmission on basis of authentication

Patent metadata

Field	Value
Publication number	US-12119673-B2
Application number	US-201917310168-A
Country	US
Kind code	B2
Filing date	Oct 16, 2019
Priority date	Jan 23, 2019
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

The present disclosure relates to a device and a method for performing wireless power transmission on the basis of authentication. A wireless power receiver according to the present specification comprises a communication/control circuit for performing an authentication procedure on the basis of out-band communication, wherein the out-band communication is Bluetooth low energy (BLE) communication, and the communication/control circuit performs the authentication procedure on the basis of a logical link control and adaptation protocol (L2CAP) or a generic attribute profile (GATT) of the BLE communication. The present disclosure defines an authentication procedure or authentication messages of a wireless transmission device or a wireless reception device by using an out-band communication protocol, and thus can support various applications of wireless power.

First claim

What is claimed is:

1. A wireless power receiver for performing authentication based on out-band communication, the wireless power receiver comprising:
a power pick-up circuit configured to receive wireless power from a wireless power transmitter by magnetic coupling to the wireless power transmitter at an operating frequency and convert an alternating current signal generated by the wireless power to a direct current signal;
a communication/control circuit configured to receive the direct current signal from the power pick-up circuit and to perform at least one of in-band communication using the operating frequency or out-band communication using a frequency other than the operating frequency; and
a load configured to be supplied with the direct current signal from the power pick-up circuit,
wherein the communication/control circuit performs an authentication procedure based on the out-band communication,
the wireless power receiver is an initiator of the authentication procedure, and
the wireless power transmitter is a responder of the authentication procedure,
wherein the out-band communication uses Bluetooth Low Energy (BLE), and the communication/control circuit performs the authentication procedure based on a Logical Link Control and Adaptation Protocol (L2CAP) or a Generic Attribute Profile (GATT) of the BLE,
wherein the communication/control circuit performs the authentication procedure based on the L2CAP, and
wherein the authentication procedure based on the L2CAP includes transmitting a Low Energy (LE) credit-based connection request message including identification information of a first channel related to the wireless power receiver to the wireless power transmitter, receiving an LE credit-based connection response message including identification information of a second channel related to the wireless power transmitter from the wireless power transmitter, transmitting a first LE information frame including the identification information of the second channel and an authentication request message to the wireless power transmitter, and receiving a second LE information frame including identification information of the first channel and an authentication response message from the wireless power transmitter.

2. The wireless power receiver of claim 1 , wherein the communication/control circuit performs the authentication procedure based on the GATT, wherein the GATT-based authentication procedure includes performing a procedure for negotiating with the wireless power transmitter for a Maximum Transmission Unit (MTU), which is the maximum data size transmitted, by the communication/control circuit and transmitting or receiving an authentication-related message based on the MTU when the negotiation for the MTU is completed.

3. The wireless power receiver of claim 2 , wherein, when the negotiated MTU is larger than the size of the authentication-related message, the GATT-based authentication procedure includes transmitting a WRITE REQUEST packet including an authentication request message to the wireless power transmitter by the communication/control circuit and receiving a NOTIFICATION packet including an authentication response message from the wireless power transmitter.

4. The wireless power receiver of claim 2 , wherein, when the negotiated MTU is less than the size of the authentication-related message, the GATT-based authentication procedure includes transmitting a WRITE REQUEST packet including an authentication request message to the wireless power transmitter by the communication/control circuit, receiving a NOTIFICATION packet indicating that an authentication response message is DATA TOO BIG from the wireless power transmitter, transmitting a read Binary Large Object (BLOB) request packet indicating a byte offset of the authentication response message to the wireless power transmitter, and receiving a read BLOB response packet including a portion ranging from the byte offset to the negotiated MTU within the authentication response message from the wireless power transmitter.

5. The wireless power receiver of claim 2 , wherein, when the negotiated MTU is less than the size of the authentication-related message, the GATT-based authentication procedure includes transmitting a WRITE REQUEST packet including an authentication request message to the wireless power transmitter by the communication/control circuit and receiving an authentication response message comprising a plurality of message fragments over a plurality of NOTIFICATION packets from the wireless power transmitter, wherein one NOTIFICATION packet includes one message fragment.

6. The wireless power receiver of claim 5 , wherein the header a header for each of the plurality of message fragments includes a control field indicating the number of the plurality of message fragments or the number of the one message fragment.

7. The wireless power receiver of claim 1 , wherein the authentication request message includes one of GET_CERTIFICATE, GET_DIGESTS, and CHANLLENGE; and
the authentication response message includes one of CERTIFICATE, DIGESTS, and CHALLENGE_AUTH.

8. The wireless power receiver of claim 7 , wherein the communication/control circuit includes an out-band communication module performing the out-band communication and an in-band communication module performing the in-band communication;
and the authentication procedure is performed after handover from the in-band communication to the out-band communication is completed.

9. A wireless power transmitter for performing authentication based on out-band communication, the wireless power transmitter comprising:
a power conversion circuit configured to transfer wireless power to a wireless power receiver by magnetic coupling to the wireless power receiver at an operating frequency; and
a communication/control circuit configured to perform at least one of in-band communication using the operating frequency or out-band communication using a frequency other than the operating frequency,
wherein the communication/control circuit performs an authentication procedure based on the out-band communication,
the wireless power receiver is an initiator of the authentication procedure, and
the wireless power transmitter is a responder of the authentication procedure,
wherein the out-band communication uses Bluetooth Low Energy (BLE), and the communication/control circuit performs the authentication procedure based on a Logical Link Control and Adaptation Protocol (L2CAP) or a Generic Attribute Profile (GATT) of the BLE,
wherein the communication/control circuit performs the authentication procedure based on the L2CAP, and
wherein the authentication procedure based on the L2CAP includes receiving a Low Energy (LE) credit-based connection request message including identification information of a first channel related to the wireless power receiver from the wireless power receiver, transmitting an LE credit-based connection response message including identification information of a second channel related to the wireless power transmitter to the wireless power receiver, receiving a first LE information frame including the identification information of the second channel and an authentication request message from the wireless power receiver, and transmitting a second LE information frame including identification information of the first channel and an authentication response message to the wireless power receiver.

10. The wireless power transmitter of claim 9 , wherein the communication/control circuit performs the authentication procedure based on the GATT, wherein the GATT-based authentication procedure includes performing a procedure for negotiating with the wireless power receiver for a Maximum

Assignees

• Lg Electronics Inc

Inventors

• Kim Jaehyu
• Choi Jingu
• Lee Minsoo
• Lim Jinkwon

Classifications

• H04W12/06 Primary

  Authentication · CPC title

• H04W4/80

  Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J50/80 Primary

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

• H04W12/00

  Security arrangements; Authentication; Protecting privacy or anonymity · CPC title