METHOD FOR DETECTING FOREIGN MATERIAL IN WIRELESS POWER TRANSMISSION SYSTEM USING MAGNETIC RESONANCE INDUCTION MANNER

摘要

According to the present invention, when a foreign material is detected in a wireless power transmission system, it is determined whether the foreign material is a device being charged or not by transmitting a joining request signal. A method for detecting a foreign material by a wireless power transmission device in a wireless power transmission system using the magnetic resonance induction manner according to the present invention comprises the steps of detecting a foreign material by detecting at least one change of a current, a voltage and a phase; transmitting a joining request signal according to a magnetic field communication protocol; detecting a joining response signal which responds to the joining request signal; and informing a user of the presence of the foreign material unless receiving the joining response signal.;COPYRIGHT KIPO 2014;[Reference numerals] (AA) Start; (BB,DD,GG) No; (CC,EE,FF) Yes; (HH) End; (S510) Foreign material detected?; (S530) Transmit a joining request signal N = N+1; (S540) Joining request signal received ?; (S550) Charging mode; (S570) Inform