{
  "$type": "site.standard.document",
  "description": "A method of controlling a wireless power transmitter is discussed. The method includes transmitting a power signal having a predetermined strength; measuring a quality factor and a peak frequency of a coil of the wireless power transmitter using the power signal; receiving reference values…",
  "path": "/patents/1293367",
  "publishedAt": "2021-06-17T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/60",
    "LG INNOTEK CO., LTD."
  ],
  "textContent": "A method of controlling a wireless power transmitter is discussed. The method includes transmitting a power signal having a predetermined strength; measuring a quality factor and a peak frequency of a coil of the wireless power transmitter using the power signal; receiving reference values including a reference quality factor and a reference peak frequency of a wireless power receiver; determining whether or not a foreign object is present in a charging area of the wireless power transmitter based on a comparison of the reference quality factor with the measured quality factor and a comparison of the reference peak frequency with the measured peak frequency; transmitting response signals indicating a result of the determination; and determining whether to continue or stop a wireless charging procedure based on the response signals.",
  "title": "METHOD FOR DETECTING FOREIGN MATERIAL, AND APPARATUS AND SYSTEM THEREFOR"
}