{
  "$type": "site.standard.document",
  "description": "A wireless power transfer system includes a power receiver () receiving a power transfer from a power transmitter () via a wireless inductive power transfer signal. The power transmitter () comprises a transmit power coil () generating the power transfer signal. A test signal coil () coupled to a…",
  "path": "/patents/1274672",
  "publishedAt": "2020-10-15T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/12",
    "KONINKLIJKE PHILIPS N.V."
  ],
  "textContent": "A wireless power transfer system includes a power receiver () receiving a power transfer from a power transmitter () via a wireless inductive power transfer signal. The power transmitter () comprises a transmit power coil () generating the power transfer signal. A test signal coil () coupled to a test signal generator () generates a magnetic test signal. A plurality of spatially distributed detection coils () is coupled to measurement unit () generating a set of measurement values reflecting signals induced in the detection coils () by the magnetic test signal. A processor () determines a measurement spatial distribution of the measurement value where the spatial distribution reflects positions of the detection coils (). A foreign object detector () detects a presence of a foreign object in response to a comparison of the measurement spatial distribution to a reference spatial distribution. The foreign object detector () is arranged to determine the reference spatial distribution in response to data received from the power receiving device ().",
  "title": "FOREIGN OBJECT DETECTION IN A WIRELESS POWER TRANSFER SYSTEM"
}