{
  "$type": "site.standard.document",
  "description": "A wireless power supply system includes a power transmission device (10a) having a power transmission coil (14) and a power receiving device (40) having a power receiving coil (41). The power transmission coil (14) transmits electric power to the power receiving coil (41) via a wireless connection…",
  "path": "/patents/932651",
  "publishedAt": "2017-01-04T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L50/51",
    "NISSAN MOTOR [JP]"
  ],
  "textContent": "A wireless power supply system includes a power transmission device (10a) having a power transmission coil (14) and a power receiving device (40) having a power receiving coil (41). The power transmission coil (14) transmits electric power to the power receiving coil (41) via a wireless connection, so as to supply the electric power to a battery (44) installed in the power receiving device (40). The power transmission device (10a) includes a control amount calculator (29) configured to control electric power supplied to the power transmission coil (14) according to a transmission power command value. The power receiving device (40) includes an efficiency calculator (55) configured to calculate a power transmission efficiency based on the electric power supplied to the electrical load and the transmission power command value, a relay (47) configured to switch between supply and stop of the electric power with respect to the battery (44), and a relay controller (54) configured to cut off the relay (47) to stop supplying the electric power when the power transmission efficiency falls to a threshold efficiency or less. The control amount calculator (29) regulates the output power when a current flowing through the power transmission coil (14) exceeds a threshold current.",
  "title": "WIRELESS POWER SUPPLY SYSTEM AND POWER TRANSMISSION DEVICE"
}