{
  "$type": "site.standard.document",
  "description": "Methods and apparatus for online foreign object detection for use with wireless charging systems. In an embodiment, an apparatus is provided that comprises a resonant circuit having a foreign object detection (FOD) coil that is energized by an online power transfer coil. The resonant circuit…",
  "path": "/patents/1296589",
  "publishedAt": "2021-07-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/60",
    "Wen Cai"
  ],
  "textContent": "Methods and apparatus for online foreign object detection for use with wireless charging systems. In an embodiment, an apparatus is provided that comprises a resonant circuit having a foreign object detection (FOD) coil that is energized by an online power transfer coil. The resonant circuit outputs a time-decaying resonate signal that indicates whether or not a foreign object is present. The apparatus also comprises a determination circuit that determines a decay time from the time-decaying resonate signal, and a detector circuit that outputs a detection signal having a first state when the decay time is greater than a threshold value to indicate that a foreign object is not present. The detector circuit also outputs the detection signal having a second state when the decay time is not greater than the threshold value to indicate that a foreign object is present.",
  "title": "METHODS AND APPARATUS FOR ONLINE FOREIGN OBJECT DETECTION IN WIRELESS CHARGING SYSTEMS"
}