Wireless power feeding system and wireless power feeding method

摘要

An object is to provide a power feeding system and a power feeding method which are more convenient for a power feeding user at the power receiving end, without causing increases in complexity and size of devices. An object is to provide a power feeding system and a power feeding method which also allow a power feeding provider (a company) which feeds power (at the power transmitting end) to supply power without waste. A power feeding device which wirelessly supplies power to a power receiver detects the position and the resonant frequency of the power receiver by receiving a position and resonant frequency detection signal using a plurality of sub-carriers having different frequencies from the power receiver, and controls the frequency of a power signal to be transmitted to the power receiver on the basis of the information. An efficient power feeding service can be offered by transmitting a power signal to the power receiver at an optimum frequency for high power transmission efficiency.

主权项

1. A semiconductor device comprising:
an antenna circuit; a rectifier circuit; a demodulation circuit; a signal processing circuit portion; an oscillator circuit; a divider circuit; a switch; a mixer; and a secondary battery, wherein the antenna circuit is configured to receive an electromagnetic wave from a power feeding device and output an electrical signal, wherein the rectifier circuit is configured to rectify the electrical signal and generate a rectified signal, wherein the demodulation circuit is configured to demodulate the rectified signal and transmit a demodulated signal to the signal processing circuit portion, wherein the signal processing circuit portion is configured to receive the demodulated signal and generate a transmission signal, wherein the oscillator circuit is configured to operate in response to the transmission signal and input a base carrier to the divider circuit and the mixer via the switch, wherein the divider circuit is configured to divide a frequency of the base carrier, thereby generating signals having a plurality of frequencies which are lower than the frequency of the base carrier generated in the oscillator circuit, wherein the switch is configured to select one of the signals having the plurality of frequencies and transmit a selected signal to the mixer, wherein the mixer is configured to mix the base carrier with the selected signal, and is configured to transmit a mixed signal to the antenna circuit, wherein the secondary battery is configured to store first power transmitted from the power feeding device and supply second power to a power load portion, and wherein the switch is provided between the mixer and the divider circuit.