{
  "$type": "site.standard.document",
  "description": "A wireless power transmitter () comprises a driver () generating a drive signal for a transmitter coil () thereby generating a power transfer signal during power transfer intervals of a repeating time frame comprising at least one power transfer interval and one foreign object detection interval. A…",
  "path": "/patents/1271229",
  "publishedAt": "2020-09-03T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/60",
    "KONINKLIJKE PHILIPS N.V."
  ],
  "textContent": "A wireless power transmitter () comprises a driver () generating a drive signal for a transmitter coil () thereby generating a power transfer signal during power transfer intervals of a repeating time frame comprising at least one power transfer interval and one foreign object detection interval. A test generator () generates a test drive signal for a test coil () thereby generating an electromagnetic test signal during foreign object detection intervals. A foreign object detector () performs a foreign object detection test in response to a measured parameter for the test drive signal during the foreign object detection intervals. An adapter () generates a varying test drive signal for the test coil () during an adaptation interval, and determines a test drive signal parameter value in response to the varying test drive signal. The test generator () sets a signal property of the test drive signal during at least one foreign object detection interval in response to the test drive signal parameter value.",
  "title": "FOREIGN OBJECT DETECTION IN A WIRELESS POWER TRANSFER SYSTEM"
}