Patent ID: 9502920
Filing Date: 2016-11-22
CPC Classification: B60L,H02J,Y02T

Claim Text:
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, and wherein the second unit comprises a second coil in which a resistance value between its first terminal and its second terminal is changeable.