METHOD FOR DETECTING FOREIGN MATERIAL, AND APPARATUS AND SYSTEM THEREFOR

A power reception method for a wireless power receiver, the power reception method including storing information on a reference quality factor and a reference peak frequency; generating a foreign object detection (FOD) status packet including the information on the reference quality factor and the reference peak frequency; transmitting the FOD status packet to a wireless power transmitter; and receiving a foreign object detection indicator indicating whether a foreign object is present in a charging area of the wireless power transmitter in response to the FOD status packet, wherein the FOD status packet has a length of two bytes, wherein one byte of the FOD status packet includes a 6-bit reservation field and a 2-bit mode field, and wherein all bits of the reservation field are recorded as zero.