Wireless power feeding system
First Claim
1. A wireless power feeding system comprising:
- 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,wherein one of a source and a drain of the transistor is electrically connected to one terminal of the load coil, andwherein the other of the source and the drain of the transistor is electrically connected to the other terminal of the load coil.
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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.
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Citations
19 Claims
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1. 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, wherein one of a source and a drain of the transistor is electrically connected to one terminal of the load coil, and wherein the other of the source and the drain of the transistor is electrically connected to the other terminal of the load coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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, wherein one of a source and a drain of the transistor is electrically connected to one terminal of the load coil, and wherein the other of the source and the drain of the transistor is electrically connected to the other terminal of the load coil. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. 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 one of a source and a drain of the transistor is electrically connected to one terminal of the load coil, and wherein the other of the source and the drain of the transistor is electrically connected to the other terminal of the load coil. - View Dependent Claims (18, 19)
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Specification