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; and
a power receiving device comprising;
a first resonant coil in which a first high-frequency voltage be induced by magnetic resonance with the power transmission device;
a first unit comprising a first coil, the first coil being adjacent to the first resonant coil to induce a second high-frequency voltage by electromagnetic induction with the first resonant coil;
a load configured to be supplied with electric power using the second high-frequency voltage induced by the first coil;
a first demodulation circuit configured to demodulate a signal from the second high-frequency voltage; and
a second unit configured to receive the signal and to modulate amplitude of the first high-frequency voltage induced in the first resonant coil,wherein the power receiving device is configured to respond to the signal using the second unit, andwherein the second unit comprises a second coil in which a resistance value between its first terminal and its second terminal is changeable.
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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.
28 Citations
13 Claims
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1. A power feeding system comprising:
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a power transmission device; and a power receiving device comprising; a first resonant coil in which a first high-frequency voltage be induced by magnetic resonance with the power transmission device; a first unit comprising a first coil, the first coil being adjacent to the first resonant coil to induce a second high-frequency voltage by electromagnetic induction with the first resonant coil; a load configured to be supplied with electric power using the second high-frequency voltage induced by the first coil; a first demodulation circuit configured to demodulate a signal from the second high-frequency voltage; and a second unit configured to receive the signal and to modulate amplitude of the first high-frequency voltage induced in the first resonant coil, wherein the power receiving device is configured to respond to the signal using the second unit, and wherein the second unit comprises a second coil in which a resistance value between its first terminal and its second terminal is changeable. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power feeding system comprising:
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a power transmission device; and a power receiving device comprising; a first resonant coil in which a first high-frequency voltage is induced by magnetic resonance with the power transmission device; a power-receiving/communication coil being adjacent to the first resonant coil to induce a second high-frequency voltage by electromagnetic induction with the first resonant coil; a switching unit including a first terminal being capable of electrically connecting to a first terminal of the power-receiving/communication coil and a second terminal being capable of electrically connecting to a second terminal of the power-receiving/communication coil; a load including a first terminal being capable of electrically connecting to the first terminal of the switching unit and a second terminal being capable of electrically connecting to the second terminal of the switching unit; a first variable resistance unit including a first terminal being capable of electrically connecting to the first terminal of the switching unit and a second terminal being capable of electrically connecting to the second terminal of the switching unit; a first demodulation circuit configured to demodulate a signal from the second high-frequency voltage induced in the power-receiving/communication coil, the first demodulation circuit including a first terminal being capable of electrically connecting to the first terminal of the switching unit and a second terminal being capable of electrically connecting to the second terminal of the switching unit; and a first controller configured to generate a switching signal for selecting to receive power or to respond and a response signal in response to the signal, wherein in a state where the power-receiving/communication coil is electrically connected to the first variable resistance unit, a resistance value between the first terminal and the second terminal of the power-receiving/communication coil is changed by the first variable resistance unit based on the response signal. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification