{
  "$type": "site.standard.document",
  "description": "A power transmitter comprises a transmitter coil () generating an electromagnetic field. A set of balanced detection coils (, ) comprises detection coils in series and compensating each other. A foreign object detector () performs foreign object detection, by potentially detect a foreign object in…",
  "path": "/patents/1346893",
  "publishedAt": "2023-06-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/60",
    "KONINKLIJKE PHILIPS N.V."
  ],
  "textContent": "A power transmitter comprises a transmitter coil () generating an electromagnetic field. A set of balanced detection coils (, ) comprises detection coils in series and compensating each other. A foreign object detector () performs foreign object detection, by potentially detect a foreign object in response to a property of an output signal from the set of balanced detection coils (, ) in response to the electromagnetic test meeting a foreign object detection criterion. A communicator () is coupled to a communication antenna () communicates with a power receiver () via this. The communication antenna () comprises a plurality of communication coils (, ) coupled in parallel. A first segment of a first communication coil () has a first coupling to a first detection coil and a second segment of a second coil () has a second coupling to a second detection coil. The couplings are capacitive and/or inductive couplings and the first coupling and the second coupling compensate each other in the output signal.",
  "title": "FOREIGN OBJECT DETECTION IN A WIRELESS POWER TRANSFER SYSTEM"
}