Patent ID: 9270342
Filing Date: 2016-02-23
CPC Classification: H02J,H04B,Y02E,Y04S

Claim Text:
1. A transmission coil for transmitting wireless power to a receive coil, the transmission coil comprising: a first spiral coil comprising a plurality of turns, a center of the first spiral coil to an outermost turn of the first spiral coil defining a first cross section; and a second spiral coil comprising a plurality of turns, a center of the second spiral coil to an outermost turn of the second spiral coil defining a second cross section, portions of the first spiral coil along the first cross section and the second spiral coil along the second cross section having a mutual inductance with respect to the receive coil greater than 65% of a maximum mutual inductance along the first and second cross sections, the second spiral coil counter-wound relative to the first spiral coil.