{
  "$type": "site.standard.document",
  "description": "In a resonant frequency control method in a magnetic field resonant coupling type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonance, a high-speed, accurate and real-time adjustment of the resonant…",
  "path": "/patents/994989",
  "publishedAt": "2012-12-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G06G7/18",
    "FUJITSU LTD [JP]"
  ],
  "textContent": "In a resonant frequency control method in a magnetic field resonant coupling type power transmission system transmitting an electric power from a power transmitting coil to a power receiving coil using magnetic field resonance, a high-speed, accurate and real-time adjustment of the resonant frequency of a coil is realized. The phase of a voltage supplied to a power transmitting coil and the phase of a current that flows in the power transmitting coil or a power receiving coil is detected and the resonant frequency of the power transmitting coil or the power receiving coil is varied such that the phase difference between them becomes a target value. The power transmitting coil has a power supplying coil to which an alternating-current power supply is connected and a power transmitting resonant coil electromagnetically coupled with the power supplying coil closely, and the power receiving coil resonant coil and a power drawing coil electromagnetically coupled with the power receiving resonant coil closely. Control is performed such that the phase difference between the voltage of the alternating-current power supply and the current of the power transmitting resonant coil becomes a target value ², and the phase difference between the voltage of the alternating-current power supply and the current of the power receiving resonant coil becomes a target value (²-À/2) .",
  "title": "RESONANCE FREQUENCY CONTROL METHOD, POWER TRANSMISSION DEVICE, AND POWER RECEPTION DEVICE FOR MAGNETIC-RESONANT-COUPLING TYPE POWER TRANSMISSION SYSTEM"
}