US 2010/0148939 A1 · ELECTRIC POWER TRANSMITTING AND RECEIVING DEVICE, ELECTRIC POWER TRANSMITTING DEVICE AND ELECTRIC POWER RECEIVING DEVICE

Abstract

In wireless electric power transmission and reception, the efficiency of transmission and reception is improved and a device to which electric power can be supplied is specified to improve security. Two antennas with different resonance frequencies are provided, and the resonance frequencies of a reception loop and a reception coil of a receiver are corrected in accordance with a reception status of a carrier transmitted from a transmitter to improve the efficiency of transmission and reception. Further, data transmitted from the transmitter are demodulated on the basis of the reception levels of two antennas with different resonance frequencies, and the data are transmitted to the transmitter using a reflective wave to perform data transmission and reception. By using this, device authentication is performed, and security is improved.

Claims8

Dependent claims

An electric power transmitting and receiving device for transmitting electric power from a transmitting device to a receiving device using magnetic resonance at a predetermined resonance frequency, wherein the transmitting device includes:

a transmission unit which includes a transmission loop and a transmission coil and transmits the electric power;
a supplying unit which supplies the electric power to the transmission unit;
a detection unit which detects a frequency transmitted from the transmission unit;
and a transmitter which includes a first correction unit for correcting the frequency transmitted from the transmission unit, and
the receiving device includes:
a reception unit which includes a reception loop and a reception coil for receiving the electric power transmitted from the transmission unit;
a first antenna having a resonance frequency higher than that of the reception unit;
a second antenna having a resonance frequency lower than that of the reception unit;
a comparing unit which compares reception levels between the first antenna and the second antenna;
and a receiver which includes a second correction unit for correcting the resonance frequency of the reception unit on the basis of the comparison result of the comparing unit.

7 more elements

Dependencies are inferred from the claim text.

Electric power transmitting and receiving device, electric power transmitting device and electric power receiving device

Life of this patent

Electric power transmitting and receiving device, electric power transmitting device and electric power receiving device

Life of this patent

Abstract

Claims8