COIL UNIT, WIRELESS POWER FEEDING DEVICE, WIRELESS POWER RECEIVING DEVICE, AND WIRELESS POWER TRANSMISSION DEVICE
First Claim
1. A coil unit comprising:
- a power transmission coil;
a reactance circuit that forms a resonant circuit together with the power transmission coil; and
a metal part disposed on a same side as a back side of the power transmission coil,wherein the reactance circuit has a first reactance circuit connected to one end of a winding of the power transmission coil, and a second reactance circuit connected to another end of the winding of the power transmission coil, andwherein a ratio of a second reactance value of the second reactance circuit to a first reactance value of the first reactance circuit is set based on a ratio of a mean distance between the winding and the metal part in a part of the winding from the one end to a central portion to a mean distance between the winding and the metal part in a part of the winding from the other end to the central portion.
1 Assignment
0 Petitions
Accused Products
Abstract
A coil unit, a wireless power feeding device, a wireless power receiving device, and a wireless power transmission device are provided that can reduce high induced voltage on the metal part. A coil unit includes a power transmission coil, reactance circuits and that each form a resonant circuit together with the power transmission coil, and a metal part disposed on the same side as the back side of the power transmission coil. A ratio between a first reactance value of the first reactance circuit and a second reactance value of the second reactance circuit is set based on the ratio of the mean distance between the winding and the metal part in a part of the winding from the other end to the central portion to the mean distance between the winding and the metal part in a part of the winding from one end to the central portion.
3 Citations
6 Claims
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1. A coil unit comprising:
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a power transmission coil; a reactance circuit that forms a resonant circuit together with the power transmission coil; and a metal part disposed on a same side as a back side of the power transmission coil, wherein the reactance circuit has a first reactance circuit connected to one end of a winding of the power transmission coil, and a second reactance circuit connected to another end of the winding of the power transmission coil, and wherein a ratio of a second reactance value of the second reactance circuit to a first reactance value of the first reactance circuit is set based on a ratio of a mean distance between the winding and the metal part in a part of the winding from the one end to a central portion to a mean distance between the winding and the metal part in a part of the winding from the other end to the central portion. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification