WIRELESS POWER RECEIVER, WIRELESS POWER TRANSMITTER, AND WIRELESS POWER TRANSFER METHOD USING SAME

A wireless power receiver comprises: a power pickup circuit for receiving wireless power from a wireless power transmitter on the basis of a magnetic coupling with the wireless power transmitter, and converting an alternating current signal generated by the wireless power into a direct current signal; and a communication/control circuit for communicating with the wireless power transmitter and controlling the wireless power that is received, wherein the communication/control circuit transmits, to the wireless power transmitter, an end power transfer packet for detecting a foreign object in a primary power transfer step of receiving the wireless power so as to enable the wireless power transmitter to detect the foreign object, receives a ping signal from the wireless power transmitter which has estimated that no foreign object is present, and transmits a data packet, in response to the ping signal, for entering a secondary power transfer step.