RESONANCE FREQUENCY CONTROL METHOD, POWER TRANSMISSION DEVICE, AND POWER RECEPTION DEVICE FOR MAGNETIC-RESONANT-COUPLING TYPE POWER TRANSMISSION SYSTEM

摘要

In a magnetic field resonance type power transmission system for transmitting electric power from a transmission system coil to a water system coil using magnetic field resonance, it is possible to adjust the resonance frequency of the coil at high speed and accurately in real time. The phase of the voltage supplied to the transmission system coil and the phase of the current flowing through the transmission system coil or the water system coil are detected and the resonance frequency of the transmission system coil or the electric system system coil is varied so that the phase difference therebetween becomes the target value. The power transmission system coil includes a power supply coil to which an AC power source is connected and a transmission resonance coil that is electromagnetically coupled with the power supply coil. The electric field coil includes power reception resonance coil and electric power And has a take-out coil. The phase difference between the voltage of the AC power supply and the current of the power reception resonance coil is controlled to be the target value (? -? / 2) so that the phase difference between the voltage of the AC power supply and the current of the transmission resonance coil becomes the target value?.