{
  "$type": "site.standard.document",
  "description": "A wireless power transfer system can be achieved at a low cost, can be used as both a power transmission apparatus and a power reception apparatus, and can cope with a change in coupling coefficient of a resonant coil of the power transmission apparatus and a resonant coil of the power reception…",
  "path": "/patents/1271222",
  "publishedAt": "2020-09-03T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J50/12",
    "Maxell Holdings, Ltd."
  ],
  "textContent": "A wireless power transfer system can be achieved at a low cost, can be used as both a power transmission apparatus and a power reception apparatus, and can cope with a change in coupling coefficient of a resonant coil of the power transmission apparatus and a resonant coil of the power reception apparatus. The wireless power transfer system is a power transmission apparatus that is able to perform bidirectional wireless power transmission, and includes the following: a power supply; a switching circuit that includes a plurality of switching devices; a resonator that includes a coil and a capacitor; a drive control circuit that controls an ON/OFF operation of each switching device of the switching circuit; and a detector that detects a resonance current flowing through the switching circuit. The drive control circuit controls the ON/OFF of each switching device of the switching circuit to perform a power transmission operation or a power reception operation based on a resonant current waveform detected by the detector.",
  "title": "WIRELESS POWER TRANSFER SYSTEM, POWER TRANSMISSION APPARATUS, AND POWER RECEPTION APPARATUS"
}