{
  "$type": "site.standard.document",
  "description": "A power transmitter () for a wireless power transfer system comprises a transmitter coil () and a driver () generates a drive signal for the transmitter coil () employing a repeating time frame with a power transfer time interval and a foreign object detection time interval. A test generator ()…",
  "path": "/patents/1298668",
  "publishedAt": "2021-08-26T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/60",
    "KONINKLIJKE PHILIPS N.V."
  ],
  "textContent": "A power transmitter () for a wireless power transfer system comprises a transmitter coil () and a driver () generates a drive signal for the transmitter coil () employing a repeating time frame with a power transfer time interval and a foreign object detection time interval. A test generator () generates a test drive signal for a test coil () during the foreign object detection time interval. A foreign object detector () performs a foreign object detection test based on a measured parameter for the test drive signal. Prior to entering a power transfer phase, an adapter () controls the power transmitter () to operate in a foreign object detection initialization mode in which a preferred value of a signal parameter for the test drive signal is determined in response to at least a first message received from the power receiver (). During the foreign object detection time interval the signal parameter of is set to the preferred value.",
  "title": "FOREIGN OBJECT DETECTION IN A WIRELESS POWER TRANSFER SYSTEM"
}