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Power receiving device, power transmission device, and power feeding system

  • US 9,502,920 B2
  • Filed: 11/05/2012
  • Issued: 11/22/2016
  • Est. Priority Date: 11/16/2011
  • Status: Active Grant
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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