Structures, devices, and methods for wireless power transfer systems are described. A structure can include a plurality of strands arranged into a first coil layer and a second coil layer. The plurality of strands can be formed on a parallel path surroundi...

A power transmission device having a surface a part of which defines a power transmission plane. The device includes: a power transmission coil structure including 2N planar coils laminated in a perpendicular direction to the power transmission plane and w...

A contactless power transmission device (1) is provided with: a washstand (10) that includes a primary coil (24); and an electric toothbrush (30) that includes a secondary coil (41), a rectifier circuit (42), and a feed control unit (43). The electric toot...

There are provided a coil for cordless charging, which may be formed as a thin coil in spite of the presence of a plurality of coils included therein, and a cordless charging apparatus using the same. The cordless charging apparatus includes: a coil unit i...

An antenna (200) and a mobile terminal (100) having the antenna are discussed. According to an embodiment, the antenna can include a flexible board (210) having a first region and a second region; a high frequency antenna pattern (220) formed in the first ...

There are provided a thin film coil and an electronic device having the same, the thin film coil including a substrate; and a coil pattern including a first coil strand and a second coil strand formed on both surfaces of the substrate, respectively, wherei...

A noncontact power-transmission coil is provided. The noncontact power-transmission coil includes a planar coil and a printed-circuit board. The planar coil is formed by spirally winding a linear conductor made of a single or twisted wire in a substantiall...

Wireless power supply and information communication are achieved between electronic circuit substrates in the electronic equipment, and the size of the means for achieving the above is reduced. There are provided a first electronic circuit substrate 2, a s...

A super-thin PCB (Printed Circuit Board) transformer is manufactured by installing windings on a common PCB without using a magnetic core. A non-contact battery charger using the PCB transformer includes a converter for converting a supply voltage into a h...