WIRELESS POWER TRANSMITTER AND WIRELESS POWER TRANSMISSION METHOD BY WIRELESS POWER TRANSMITTER

摘要

In a wireless power transmission method according to an embodiment of the present specification, a power transmission step comprises: receiving, from a wireless power receiver, a reception power packet including information related to a reception power value; stopping transmission of wireless power for a slot time on the basis of the reception power value; and detecting a foreign material on the basis of a change in voltage or current within the slot time.