Method for detecting foreign material of wireless power transmission apparatus

Abstract

A wireless power transmission apparatus is provided. The apparatus includes a converter configured to perform a DC/DC power conversion operation, an inverter connected to the converter and configured to perform an AC/DC power conversion operation, a coil connected to the inverter, memory storing one or more computer programs, and one or more processors communicatively coupled to the converter, the inverter, the coil, and the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the wireless power transmission device to control the inverter to transmit first power of a first frequency through the coil, compare a first current input to the inverter through the converter with a reference value while the first power is transmitted, identify whether a packet from the outside is identified based on the first current being greater than the reference value, control the inverter to transmit second power having a second frequency lower than the first frequency through the coil based on the packet not being identified while the first power is transmitted, identify whether the packet is identified based on the second current being larger than the reference value, and identify that a foreign material is present, based on the packet not being identified while the second power is transmitted.