Method and device for preventing data transmission collision in wireless power transmission system

A wireless power transmitter, comprising:

• a power converter related to transferring wireless power to a wireless power receiver;
• and
• a communication/controller related to communicating with the wireless power receiver and controlling the transfer of the wireless power;
• wherein the communication/controller is configured to:
• transmit a digital ping to the wireless power receiver;
• enter a power transfer phase;
• receive a plurality of control error (CE) packets from the wireless power receiver during the power transfer phase;
• determine an interval between the plurality of CE packets;
• and
• transmit data packet information to the wireless power receiver during the power transfer phase based on the interval;
• wherein a length of the data packet information is determined based on a length of the interval.

A method for receiving data packet information in a wireless power transfer system, the method performed by a wireless power receiver and comprising:

• receiving a digital ping to a wireless power transmitter;
• entering a power transfer phase;
• transmitting a plurality of control error (CE) packets to a wireless power transmitter during the power transfer phase;
• receiving the data packet information from the wireless power transmitter during the power transfer phase based on an interval between the plurality of CE packets;
• wherein a length of the data packet information is determined based on a length of the interval.