| 摘要 |
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) . |
