WIRELESS POWER SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a wireless power supply device which avoids the deterioration of transfer efficiency at the time of feeding an electric power even when there are a plurality of power receiving units for one power transmission unit.SOLUTION: A phase control part 60 of a power receiving unit 12 intentionally changes a phase difference Δφ of a power reception side driving signal generated in a signal generating section 42 for a driving signal generated in a high frequency generation section 32 of a power transmission unit 11. The phase control part 60 intermittently connects a magnetic field resonance between the power transmission unit 11 and the power receiving unit 12. When supplying the electric power with magnetic field resonance between the other power receiving unit out of itself and the power transmission unit 11, the phase control part 60 sets the phase of power reception side driving signal as a phase difference Δφ of which the resonance is not generated with the power transmission unit 11. On the other hand, in the case where the electric power is not supplied by the magnetic field resonance between the other power receiving unit and the power transmission unit 11, the phase control part 60 sets the power reception side driving signal as a phase difference Δφ of which the resonance is generated with the power transmission unit 11.SELECTED DRAWING: Figure 1