{
  "$type": "site.standard.document",
  "description": "Embodiments of this application provide a wireless charger and a control method. The wireless charger includes a class-E power amplifier and a tunable impedance circuit that is connected to an output end of the class-E power amplifier. The class-E power amplifier includes a switching transistor and…",
  "path": "/patents/1425567",
  "publishedAt": "2023-12-20T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/05",
    "HUAWEI TECH CO LTD [CN]"
  ],
  "textContent": "Embodiments of this application provide a wireless charger and a control method. The wireless charger includes a class-E power amplifier and a tunable impedance circuit that is connected to an output end of the class-E power amplifier. The class-E power amplifier includes a switching transistor and a tunable capacitance circuit that is parallelly connected to the switching transistor. The wireless charger further includes a control unit, configured to obtain a constraint condition of the class-E power amplifier; determine N1 target equivalent load impedances of the class-E power amplifier based on the constraint condition; and adjust a capacitance value of the tunable capacitance circuit in the class-E power amplifier, and adjust an impedance value of the tunable impedance circuit, to enable an equivalent load impedance of the class-E power amplifier to match one of the N1 target equivalent load impedances. Because the equivalent load impedance of the class-E power amplifier matches the target equivalent load impedance, the wireless charger provided in the embodiments of this application can implement efficient and stable output of the class-E power amplifier.",
  "title": "WIRELESS CHARGER AND CONTROL METHOD"
}