Power receiving device, power transmission device, and power feeding system
First Claim
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1. A power feeding system comprising:
- a power transmission device comprising a resonant coil; and
a power receiving device comprising;
a resonant coil in which a first high-frequency voltage be induced by magnetic resonance with the resonant coil of the power transmission device, the first high-frequency voltage being amplitude-modulated;
a power receiving coil in which a second high-frequency voltage is induced by electromagnetic induction with the resonant coil of the power receiving device;
a communication coil in which a third high-frequency voltage is induced by electromagnetic induction with the resonant coil of the power receiving device;
a load including a first terminal electrically connected to a first terminal of the power receiving coil and a second terminal electrically connected to a second terminal of the power receiving coil;
a variable resistance unit including a first terminal electrically connected to a first terminal of the communication coil and a second terminal electrically connected to a second terminal of the communication coil;
a demodulation circuit configured to demodulate a demodulated signal from one of the second high-frequency voltage induced in the power receiving coil and the third high-frequency voltage induced in the communication coil; and
a controller configured to generate a response signal in response to the demodulated signal,wherein the controller is electrically connected to the load, the variable resistance unit, and the demodulation circuit.
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Abstract
A novel power receiving device and a novel power transmission device are provided. Power feeding and communication are performed using a magnetic resonance method. Specifically, in one embodiment of the present invention, power feeding is performed by generating a second high-frequency voltage based on a first high-frequency voltage induced in a resonant coil and communication is performed by modulating amplitude of the first high-frequency voltage induced in the resonant coil. Thus, it is possible to perform communication and power feeding based on data obtained by the communication in pseudo-parallel.
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Citations
14 Claims
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1. A power feeding system comprising:
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a power transmission device comprising a resonant coil; and a power receiving device comprising; a resonant coil in which a first high-frequency voltage be induced by magnetic resonance with the resonant coil of the power transmission device, the first high-frequency voltage being amplitude-modulated; a power receiving coil in which a second high-frequency voltage is induced by electromagnetic induction with the resonant coil of the power receiving device; a communication coil in which a third high-frequency voltage is induced by electromagnetic induction with the resonant coil of the power receiving device; a load including a first terminal electrically connected to a first terminal of the power receiving coil and a second terminal electrically connected to a second terminal of the power receiving coil; a variable resistance unit including a first terminal electrically connected to a first terminal of the communication coil and a second terminal electrically connected to a second terminal of the communication coil; a demodulation circuit configured to demodulate a demodulated signal from one of the second high-frequency voltage induced in the power receiving coil and the third high-frequency voltage induced in the communication coil; and a controller configured to generate a response signal in response to the demodulated signal, wherein the controller is electrically connected to the load, the variable resistance unit, and the demodulation circuit. - View Dependent Claims (2, 3, 4, 11, 12)
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5. A power feeding system comprising:
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a power transmission device comprising a resonant coil; and a power receiving device comprising a resonant coil in which a first high-frequency voltage be induced by magnetic resonance with the resonant coil of the power transmission device, wherein the power transmission device further comprises; a power transmission coil in which a second high-frequency voltage is induced by electromagnetic induction with the resonant coil of the power transmission device; a high-frequency power source electrically connected to the power transmission coil; a communication coil in which a third high-frequency voltage is induced by electromagnetic induction with the resonant coil of the power transmission device; a variable resistance unit including a first terminal electrically connected to a first terminal of the communication coil and a second terminal electrically connected to a second terminal of the communication coil; a demodulation circuit electrically connected to one of the power transmission coil and the communication coil; and a controller electrically connected to the high-frequency power source, the demodulation circuit, and the variable resistance unit. - View Dependent Claims (6, 7)
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8. A power feeding system comprising:
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a power transmission device comprising a resonant coil; and a power receiving device comprising a resonant coil in which a first high-frequency voltage be induced by magnetic resonance with the resonant coil of the power transmission device, wherein the power transmission device further comprises; a first unit configured to induce a second high-frequency voltage in the resonant coil of the power transmission device by electromagnetic induction; a second unit configured to change amplitude of the second high-frequency voltage induced in the resonant coil of the power transmission device; and a third unit configured to detect a reflected wave component from the second high-frequency voltage induced in the resonant coil of the power transmission device, and wherein the resonant coil of the power transmission device is not directly connected to the first unit, the second unit, and the third unit. - View Dependent Claims (9, 10, 13, 14)
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Specification