Nec Corporation

Kaoru Shizuno

Shuhei Yoshida

Masahiro Tanomura

Hiroshi Fukuda

Naoki Kobayashi

Yoshinori Hama

The present invention provides a power transfer system capable of reducing electromagnetic energy that disappears into a medium as a resistor when the coil of a power transmitting device and the coil of a power receiving device are apart from each other, in such a way that the power transmitting device of the power transfer system is equipped with a backside dielectric body and a shield body. A power transmitting device () faces a power receiving device () through a medium. The power transmitting device () comprises: a power transmission coil (); a containment portion () having a first surface (A) facing the power receiving device and a second surface (B) on the opposite side of the first surface and having a dielectric body covering the power transmission coil (); a backside dielectric body () provided on the second surface (B) of the containment portion and having a first surface (A) facing the containment portion and a second surface (B) on the opposite side of the first surface; and a shield body () provided on the second surface (B) of the backside dielectric body.

Power transfer system with shielding body, power transmitting device with shielding body, and power transfer method for power transmitting system

An electric power transmission device for wirelessly transmitting electric power in a highly conductive medium includes a power transmitting unit configured to wirelessly transmit electric power and a power receiving unit configured to intromit the wireless electric power transmitted from the power transmitting unit. The power transmitting unit and the power receiving unit include an electric power transmission coil and a containment member having a dielectric configured to cover the electric power transmission coil, and transmit the electric power by causing resonance at a frequency determined by impedance of the power transmitting unit, impedance of the power receiving unit, and impedance of the highly conductive medium.

Electric power transmission device and electric power transmission method

In order to stably supply power even under a condition such that variations in a transmission environment occur constantly and irregularly in a wireless power transmission, a wireless power transmission control device of the present invention includes: a data collection means for obtaining data indicating the characteristics of a transmission medium for wireless transmission of power via a receiving antenna provided in a movable body; a data prediction means for deriving predicted transmission characteristics that predict a change in the characteristics of the transmission medium by using the data and for calculating a control parameter corresponding to the predicted transmission characteristics; and a parameter control means for controlling the movable body and the receiving antenna by using the control parameter.

Wireless power transmission control device, wireless power transmission system, and wireless power transmission control method

A transmission apparatus transmits electric power via a medium that is present between the transmission apparatus and a receiving apparatus. The transmission apparatus includes: an antenna; and a power transmission circuit that outputs electric power via the antenna of the transmission apparatus, the electric power having a first resonance frequency determined by an impedance of the medium, an impedance of the antenna of the transmission apparatus, and an impedance of an antenna of the receiving apparatus.

Growing community of inventors

Tokyo, Japan

Kaoru Shizuno