Wireless power transmission device, wireless power transmission method by wireless power transmission device, wireless power reception device, and wireless power reception method by wireless power reception device
A wireless power transmission method by a wireless power transmission device according to an embodiment of the present specification comprises: a ping step of transmitting a digital ping and receiving a response to the digital ping from a wireless power reception device; a configuration step of receiving, from the wireless power reception device, a configuration packet including information on elements of an initial power transmission contract; a negotiation step of receiving, from the wireless power reception device, information on elements of an extended power transmission contract for updating the initial power transmission contract to the extended power transmission contract; and a power transmission step of transmitting wireless power to the wireless power reception device on the basis of the extended power transmission contract, wherein in the power transmission step, a request packet for requesting a specific packet is received from the wireless power reception device, and in response to the request packet, the specific packet is transmitted to the wireless power reception device.
1 . A method for transferring wireless power, the method performed by a wireless power transmitter and comprising:
transmitting a digital ping to a wireless power receiver;
after transmitting the digital ping, receiving a signal strength (SIG) packet from the wireless power receiver;
after receiving the SIG packet, receiving a configuration (CFG) packet from the wireless power receiver;
after receiving the CFG packet, performing a negotiation phase to negotiate a power transfer contract element; and
after performing the negotiation phase, entering a power transfer phase;
wherein, in the power transfer phase,
a request packet requesting a specific packet is received from the wireless power receiver,
the specific packet is transmitted to the wireless power receiver in response to the request packet.
2 . The method of claim 1 , wherein the request packet includes a header value of the specific packet.
3 . The method of claim 1 , wherein the specific packet is a packet including information on negotiable load power of the wireless power transmitter.
4 . The method of claim 1 , wherein the specific packet is a packet including information on potential load power of the wireless power transmitter.
5 . The method of claim 1 , wherein the specific packet is a foreign object detection status packet including information on a foreign object detection result.
6 . A wireless power transmitter, comprising:
a power converter configured to transfer wireless power to a wireless power receiver by magnetic coupling with the wireless power receiver at an operating frequency; and
a controller configured to communicate with the wireless power receiver and to control the transfer of the wireless power,
wherein the controller is configured to:
transmit a digital ping to the wireless power receiver;
after transmitting the digital ping, receive a signal strength (SIG) packet from the wireless power receiver;
after receiving the SIG packet, receive a configuration (CFG) packet from the wireless power receiver;
after receiving the CFG packet, perform a negotiation phase to negotiate a power transfer contract element; and
after performing the negotiation phase, enter a power transfer phase;
wherein, in the power transfer phase,
a request packet requesting a specific packet is received from the wireless power receiver,
the specific packet is transmitted to the wireless power receiver in response to the request packet.
7 . The wireless power transmitter of claim 6 , wherein the request packet includes a header value of the specific packet.
8 . The wireless power transmitter of claim 6 , wherein the specific packet is a packet including information on negotiable load power of the wireless power transmitter.
9 . The wireless power transmitter of claim 6 , wherein the specific packet is a packet including information on potential load power of the wireless power transmitter.
10 . The wireless power transmitter of claim 6 , wherein the specific packet is a foreign object detection status packet including information on a foreign object detection result.
11 . A method for receiving wireless power, the method performed by a wireless power receiver and comprising:
receiving a digital ping from a wireless power transmitter;
after receiving the digital ping, transmitting a signal strength (SIG) packet to the wireless power transmitter;
after transmitting the SIG packet, transmitting a configuration (CFG) packet to the wireless power transmitter;
after transmitting the CFG packet, performing a negotiation phase to negotiate a power transfer contract element; and
after performing the negotiation phase, entering a power transfer phase;
wherein, in the power transfer phase,
a request packet requesting a specific packet is transmitted to the wireless power transmitter,
the specific packet is received from the wireless power transmitter in response to the request packet.
12 . The method of claim 11 , wherein the request packet includes a header value of the specific packet.
13 . The method of claim 11 , wherein the specific packet is a packet including information on negotiable load power of the wireless power transmitter.
14 . The method of claim 11 , wherein the specific packet is a packet including information on potential load power of the wireless power transmitter.
15 . The method of claim 11 , wherein the specific packet is a foreign object detection status packet including information on a foreign object detection result.