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 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.

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.