Patent ID: 9716390
Date: 2017-07-25
CPC Classifications: H01F,H02J

Claim:
1. A power feeding coil unit for wirelessly feeding power, comprising: a power feeding coil having a wire wound in a helical shape; and a first auxiliary coil and a second auxiliary coil, each of the first auxiliary coil and the second auxiliary coil having a wire wound in a helical shape, wherein the first auxiliary coil and the second auxiliary coil are arranged so that the wire of the first auxiliary coil and the wire of the second auxiliary coil do not overlap the wire of the power feeding coil when viewed from a direction perpendicular to an axial direction of the power feeding coil, a direction of circulation of a magnetic flux generated by the first auxiliary coil and a magnetic flux generated by the second auxiliary coil are opposite to a direction of circulation of a magnetic flux generated by the power feeding coil, and an axis of the first auxiliary coil and an axis of the second auxiliary coil are nonparallel to a power feeding direction of the power feeding coil, and are not aligned with an axis of the power feeding coil.