{
  "$type": "site.standard.document",
  "description": "A method includes wirelessly transferring power through a main coil of a wireless power transfer system, wherein the main coil is connected in series with a main resonant capacitor, and the main coil and the main resonant capacitor form a main resonant tank having a first resonant frequency…",
  "path": "/patents/1332775",
  "publishedAt": "2022-12-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/60",
    "NuVolta Technologies (Hefei) Co., Ltd."
  ],
  "textContent": "A method includes wirelessly transferring power through a main coil of a wireless power transfer system, wherein the main coil is connected in series with a main resonant capacitor, and the main coil and the main resonant capacitor form a main resonant tank having a first resonant frequency, applying an excitation including a voltage step to an auxiliary resonant tank comprising an auxiliary coil and an auxiliary resonant capacitor, wherein the auxiliary resonant tank has a second resonant frequency different from the first resonant frequency, calculating a quality factor of the wireless power transfer system based on a plurality of parameters derived from a damped sinusoidal waveform obtained from the auxiliary resonant tank, and determining whether a foreign object is magnetically coupled to the wireless power transfer system based on the quality factor.",
  "title": "Foreign Object Detection Apparatus and Method for Wireless Power Transfer System"
}