The message 512 may be divided into a length field 5121 of a parameter and a value field 5122 of the parameter. That is, the originator of the packet 510 may generate the message by a length-value pair (5121a-5122a, etc.) of at least one parameter, which is required to represent data desired to transmit.
Referring to
The preamble 520 may be used to perform synchronization with data received by the wireless power transmitter 100 and detect the start bit of the header 520. The preamble 520 may be configured to repeat the same bit. For instance, the preamble 520 may be configured such that data bit 1 according to the DBP encoding is repeated eleven to twenty five times.
The checksum 530 may be used to detect an error that can be occurred in the command packet 510 while transmitting a power control message.
Operation Phases
Hereinafter, description will be given of operation phases of the wireless power transmitter 100 and the wireless power receiver 200.