Device and method for performing authentication in wireless power transfer system
A wireless power transmitter includes a power conversion unit configured to transfer wireless power to a wireless power receiver by using magnetic coupling between the wireless power transmitter and the wireless power receiver; and a communication/control unit configured to control the wireless power and to perform transmission or reception of data based on communication with the wireless power receiver, wherein the communication/control unit receives from the wireless power receiver a received power packet (RPP) informing a value of power received by the wireless power receiver, transmits a bit pattern, in response to the RPP, requesting for transmitting at least one data packet from the wireless power transmitter to the wireless power receiver, receives a response packet from the wireless power receiver in response to the bit pattern, and transmits the at least one data packet to the wireless power receiver.
1. A wireless power transmitter comprising:
a power converter configured to transfer wireless power to a wireless power receiver by using magnetic coupling between the wireless power transmitter and the wireless power receiver; and
a controller configured to control the wireless power and to perform transmission or reception of data based on communication with the wireless power receiver,
wherein the controller:
transmits a bit pattern requesting communication for transmitting an authentication message, receives a response packet from the wireless power receiver in response to the bit pattern, and transmits, to the wireless power receiver, the authentication message, and
wherein the controller sets a header of an auxiliary data transport (ADT) data packet to a value informing a retransmission of a previous ADT data packet in the authentication message, based on that the controller receives a not acknowledge (NAK) in response to the previous ADT data packet from the wireless power receiver.
2. The wireless power transmitter of claim 1 , wherein the bit pattern includes 8 bits.
3. The wireless power transmitter of claim 2 , wherein the bit pattern includes four ‘0’s and four ‘1’s.
4. The wireless power transmitter of claim 1 , wherein the controller transmits the bit pattern to execute authentication of the wireless power transmitter or the wireless power receiver.
5. A method of data transmission performed by a wireless power transmitter, the method comprising:
transferring wireless power to a wireless power receiver by using magnetic coupling between the wireless power transmitter and the wireless power receiver;
transmitting a bit pattern requesting communication for transmitting an authentication message;
receiving a response packet from the wireless power receiver in response to the bit pattern; and
transmitting, to the wireless power receiver, the authentication message,
wherein a header of an auxiliary data transport (ADT) data packet is set to a value informing a retransmission of a previous ADT data packet in the authentication message, based on that the wireless power transmitter receives a not acknowledge (NAK) in response to the previous ADT data packet from the wireless power receiver.
6. The method of claim 5 , wherein the bit pattern includes 8 bits.
7. The method of claim 6 , wherein the bit pattern includes four ‘0’s and four ‘1’s.
8. The method of claim 5 , wherein the bit pattern is transmitted to execute authentication of the wireless power transmitter or the wireless power receiver.
9. A wireless power receiver comprising:
a power pickup unit configured to receive wireless power from a wireless power transmitter by using magnetic coupling between the wireless power transmitter and the wireless power receiver; and
a controller configured to control the wireless power and to perform transmission or reception of data based on communication with the wireless power transmitter,
wherein the controller:
receives a bit pattern requesting communication for transmitting an authentication message, transmits a response packet to the wireless power transmitter in response to the bit pattern, and receives, from the wireless power transmitter, the authentication message, and
wherein a header of an auxiliary data transport (ADT) data packet is set to a value informing a retransmission of a previous ADT data packet in the authentication message, based on that the controller transmits a not acknowledge (NAK) in response to the previous ADT data packet from the wireless power transmitter.
10. The wireless power receiver of claim 9 , wherein the bit pattern includes 8 bits.
11. The wireless power receiver of claim 10 , wherein the bit pattern includes four ‘0’s and four ‘1’s.
12. The wireless power receiver of claim 9 , wherein the controller receives the bit pattern to execute authentication of the wireless power transmitter or the wireless power receiver.
13. A method of data reception performed by a wireless power receiver, the method comprising:
receiving wireless power from a wireless power transmitter by using magnetic coupling between the wireless power transmitter and the wireless power receiver;
receiving a bit pattern requesting communication for transmitting an authentication message;
transmitting a response packet to the wireless power transmitter in response to the bit pattern; and
receiving, from the wireless power transmitter, the authentication message,
wherein a header of an auxiliary data transport (ADT) data packet is set to a value informing a retransmission of a previous ADT data packet, based on that the previous ADT data packet in the authentication message is received with error.