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

摘要

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.

主权项

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.