WIRELESS POWER FEEDING SYSTEM
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Abstract
An object is to provide a wireless power feeding system using the resonance method, which can increase power transmission efficiency. The wireless power feeding system includes a power transmission coil electrically connected to a high-frequency power supply, a power transmission resonance coil for transmitting power by electromagnetic induction with the power transmission coil, a power reception resonance coil for exciting high-frequency power by magnetic resonance, a load coil for exciting high-frequency power by electromagnetic induction with the power reception resonance coil, a load, and a variable element. The load includes a microprocessor for controlling the impedance of the load, a battery charger, and a battery. The battery charger is configured to charge the battery with the high-frequency power excited by the load coil.
7 Citations
19 Claims
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1. (canceled)
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2. A wireless power feeding system comprising:
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a power transmission resonance coil configured to transmit power by electromagnetic induction with a power transmission coil; a load coil configured to excite high-frequency power by electromagnetic induction with a power reception resonance coil; a load electrically connected to the load coil; and a transistor electrically connected to the load coil, wherein a channel formation region of the transistor comprises an oxide semiconductor. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. A power-receiving device comprising:
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a load coil configured to excite high-frequency power by electromagnetic induction with a power reception resonance coil; a load electrically connected to the load coil; and a transistor electrically connected to the load coil, wherein a channel formation region of the transistor comprises an oxide semiconductor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification