WIRELESS POWER TRANSFER APPARATUS AND WIRELESS POWER TRANSFER METHOD
First Claim
1. A wireless power transfer apparatus comprising:
- a power transmitter 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,thereby transferring power from the power transmitter to the power receiver through an interaction between the power transmission coil and the power receiving coil,further comprising;
a power-transmission auxiliary device including an auxiliary resonator composed of an auxiliary coil and a resonant capacitance;
a resonance control unit for adjusting a resonant frequency of the auxiliary resonator; and
a linking supporting mechanism for keeping a coil distance between the power receiving coil and the auxiliary coil constant,wherein the power transmitter and the power-transmission auxiliary device are 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, andthe resonance control unit adjusts a resonant frequency of the auxiliary resonator in accordance with a coil distance between the power transmission coil and the auxiliary coil in an axial direction, thereby optimizing receiving power supplied to the power receiver.
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Accused Products
Abstract
A power transmitter includes a power transmission coil and a power receiver includes a power receiving coil, thereby transferring power between the coils. A power-transmission auxiliary device includes an auxiliary resonator composed of an auxiliary coil and a resonant capacitance, a resonance control unit, and a linking supporting mechanism for keeping a coil distance between the power receiving coil and the auxiliary coil constant, and forms a power receiving space for disposing the power receiving coil between the power transmission coil and the auxiliary coil. The resonance control unit adjusts a resonant frequency of the auxiliary resonator in accordance with a coil distance between the power transmission coil and the auxiliary coil, optimizing receiving power supplied to the power receiver. A possible power transfer distance is increased, and in a region shorter than the coil distance for a critical coupling state, power can be transferred stably.
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Citations
12 Claims
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1. A wireless power transfer apparatus comprising:
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a power transmitter 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, thereby transferring power from the power transmitter to the power receiver through an interaction between the power transmission coil and the power receiving coil, further comprising;
a power-transmission auxiliary device including an auxiliary resonator composed of an auxiliary coil and a resonant capacitance;a resonance control unit for adjusting a resonant frequency of the auxiliary resonator; and a linking supporting mechanism for keeping a coil distance between the power receiving coil and the auxiliary coil constant, wherein the power transmitter and the power-transmission auxiliary device are 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, and the resonance control unit adjusts a resonant frequency of the auxiliary resonator in accordance with a coil distance between the power transmission coil and the auxiliary coil in an axial direction, thereby optimizing receiving power supplied to the power receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless power transfer method using:
- a power transmitter 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, thereby transferring power from the power transmitter to the power receiver through an interaction between the power transmission coil and the power receiving coil,
wherein the method further uses a power-transmission auxiliary device including an auxiliary resonator composed of an auxiliary coil and a resonant capacitance, and the method comprising; disposing the power-transmission auxiliary device and the power transmitter so as to face each other, forming a power receiving space between the power transmission coil and the auxiliary coil, and performing power transfer with the power receiving coil being disposed in the power receiving space, while keeping a coil distance between the power receiving coil and the auxiliary coil constant, and adjusting a resonant frequency of the auxiliary resonator in accordance with the coil distance between the power transmission coil and the auxiliary coil in an axial direction, thereby optimizing receiving power to be supplied from the power transmitter to the power receiver.
- a power transmitter 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, thereby transferring power from the power transmitter to the power receiver through an interaction between the power transmission coil and the power receiving coil,
Specification