Wireless power transfer device and wireless power transfer method

摘要

A wireless power transfer device including: a power transmitter 1 including a power transmission resonator composed of a power transmission coil and a resonant capacitance; and a power receiver including a power receiving resonator composed of a power receiving coil and a resonant capacitance. The wireless power transfer device further includes a power-transmission auxiliary device including an auxiliary resonator composed of an auxiliary coil and a resonant capacitance. The power-transmission auxiliary device and the power transmitter are configured to be disposed so as to face each other, forming a power receiving space for disposing the power receiving coil between the power transmission coil and the auxiliary coil. An efficient power transfer can be performed without providing an adjusting circuit in the power receiver even when the power receiving coil is not appropriately disposed with respect to the power transmission coil.

主权项

1. A wireless power transfer device comprising:
a power transmitter including a power transmission resonator composed of a power transmission coil and a resonant capacitance; a power receiver including a power receiving resonator composed of a power receiving coil and a resonant capacitance; and a power-transmission auxiliary device including an auxiliary resonator composed of an auxiliary coil and a resonant capacitance, thereby transferring power from the power transmitter to the power receiver through magnetic field resonance between the power transmission coil and the power receiving coil, wherein the power-transmission auxiliary device and the power transmitter are configured to be disposed so as to face each other, forming a power receiving space for disposing the power receiving coil between the power transmission coil and the auxiliary coil, a resonant frequency ft of a power transmission-side resonant system composed of the power transmission resonator and the auxiliary resonator appears as two resonant frequencies of a lower resonant frequency ftL and a higher resonant frequency ftH by a close coupling between the power transmission resonator and the auxiliary resonator, and a resonant frequency f3 of the auxiliary resonator is set such that the resonant frequency f2 of the power receiving resonator coincides with either the lower resonant frequency ftL or the higher resonant frequency ftH.