Wireless Power Transmission Device And Power Generation Device Provided With Wireless Power Transmission Device

Abstract: A wireless power transmission unit includes oscillators that convert DC energy into RF energy with a frequency f 0, power transmitting antennas that transmit the RF energy, and power receiving antennas that receive at least a part of the RF energy transmitted by the power transmitting antennas. The energies received by the power receiving antennas are combined in parallel with each other and then the combined energy is output. Each power transmitting antenna is a series resonant circuit in which a power transmitting inductor and a first capacitor are connected in series. Each power receiving antenna is a parallel resonant circuit in which a power receiving inductor and a second capacitor are connected in parallel. If the oscillator has a voltage step-up ratio Voc, the power transmitting inductor has an inductance L1, the power receiving inductor has an inductance L2, and the power transmitting and power receiving  antennas  and  have  a  coupling  coefficient  k, (L2/L1) ≥ 4 (k/Voc)2 is satisfied.  The absolute value of the phase difference Ores between the respective resonant magnetic fields of first and second pairs of resonant antennas is set to fall within.the range of 90 to 180 degrees.

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