{
  "$type": "site.standard.document",
  "description": "Embodiments of this application provide a foreign object detection apparatus and a foreign object detection method. The foreign object detection apparatus includes a controller, a first resonant network, a signal coupler, and a phase difference detector. The signal coupler may obtain a resonance…",
  "path": "/patents/1395128",
  "publishedAt": "2025-11-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L53/12",
    "HUAWEI TECH CO LTD [CN]"
  ],
  "textContent": "Embodiments of this application provide a foreign object detection apparatus and a foreign object detection method. The foreign object detection apparatus includes a controller, a first resonant network, a signal coupler, and a phase difference detector. The signal coupler may obtain a resonance current signal corresponding to the first resonant network, and couple the resonance current signal to a preset carrier signal to obtain a coupled current signal. Herein, a frequency of the preset carrier signal is the same as a frequency of an excitation signal. The phase difference detector may extract a low-frequency signal component from the coupled current signal, and determine a phase difference signal based on the low-frequency signal component. An amplitude of the phase difference signal correspondingly indicates a phase difference between the excitation signal and the resonance current signal. The controller may determine, based on the amplitude of the phase difference signal, whether a foreign object exists in a detection area corresponding to the first resonant network. With the apparatus and the method provided in embodiments of this application, costs of foreign object detection can be reduced, and precision of foreign object detection can be improved.",
  "title": "FOREIGN OBJECT DETECTION APPARATUS AND METHOD, AND WIRELESS CHARGING TRANSMITTER DEVICE"
}