{
  "$type": "site.standard.document",
  "description": "A wireless power supply system includes a power transmission device having a power transmission coil and a power receiving device having a power receiving coil. The power receiving device calculates a first efficiency based on a transmission power command value and the electric power supplied to…",
  "path": "/patents/1172703",
  "publishedAt": "2016-12-08T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L11/182",
    "NISSAN MOTOR CO., LTD."
  ],
  "textContent": "A wireless power supply system includes a power transmission device having a power transmission coil and a power receiving device having a power receiving coil. The power receiving device calculates a first efficiency based on a transmission power command value and the electric power supplied to the battery. The power transmission device calculates a second efficiency based on a phase difference between a voltage and a current supplied to the power transmission coil. The power transmission device controls electric power supplied to the power transmission coil according to the transmission power command value, and regulate the electric power supplied to the power transmission coil when the first efficiency falls to a predetermined first threshold efficiency or less or when the second efficiency falls to a predetermined second threshold efficiency or less.",
  "title": "Wireless Power Supply System and Power Transmission Device"
}