COIL UNIT, NONCONTACT POWER RECEIVING APPARATUS, NONCONTACT POWER TRANSMITTING APPARATUS, NONCONTACT POWER FEEDING SYSTEM, AND VEHICLE
First Claim
1. A coil unit for performing at least one of electric power transmission and electric power reception through electromagnetic resonance, comprising:
- a plurality of self-resonant coils with respective coil diameters different from each other for resonating electromagnetically; and
a switch configured to select one of said plurality of self-resonant coils.
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Accused Products
Abstract
In a noncontact electric power feeding system by means of a resonance method, an electric power receiving apparatus includes a plurality of secondary self-resonant coils. The noncontact electric power feeding system makes a switch between these secondary self-resonant coils to detect a distance between the electric power receiving apparatus and an electric power transmitting unit, and selects, according to distance L as detected, a secondary self-resonant coil with high transfer efficiency for receiving electric power to accordingly feed electric power. In this way, distance L between the power receiving apparatus and the power transmitting unit can be precisely detected including distances from longer ones to shorter ones, and the transmission efficiency in transmitting electric power in a noncontact manner by means of the resonance method can be improved.
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Citations
15 Claims
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1. A coil unit for performing at least one of electric power transmission and electric power reception through electromagnetic resonance, comprising:
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a plurality of self-resonant coils with respective coil diameters different from each other for resonating electromagnetically; and a switch configured to select one of said plurality of self-resonant coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification