Coil apparatus and non-contact power transmission apparatus
First Claim
1. A coil apparatus for a non-contact power transmission apparatus constituted by a power transmission coil apparatus to which AC power is input and a power receive coil apparatus which outputs AC power from the power transmission coil apparatus,wherein one of the power transmission coil apparatus and the power receive coil apparatus includes:
- a first winding section which constitutes a first resonance circuit together with a first capacitance element, the first winding section being a transmission coil;
a second winding section which constitutes an excitation coil, and which is magnetically coupled to the first winding section; and
a third winding section which constitutes a second resonance circuit together with a second capacitance element, and which is magnetically coupled to the first winding section, the third winding section being a control coil that adjusts a resonance frequency of the first resonance circuit; and
wherein (1) if the second winding is for the power transmission coil apparatus, the second winding is connected to a power source, and (2) if the second winding is for the power receive coil apparatus, the second winding is connected to a load; and
the resonance frequency of the first resonance circuit is smaller than a resonance frequency of the second resonance circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
A coil apparatus and a non-contact power transmission apparatus having improved power transmission efficiency are provided.
A power transmission side coil apparatus comprises: an excitation coil (second winding section) which transmits AC power supplied from a power source to a transmission coil; a resonance circuit (first resonance circuit) which is formed by a capacitor (first capacitance element) and a transmission coil (first winding section) which is connected to this capacitor and which transmits AC power from the excitation coil to a power receive side coil apparatus; and a resonance circuit (second resonance circuit) which is formed by a variable capacitor (second capacitance element) and a control coil (third winding section) which is connected to this variable capacitor and which resonates with the transmission coil.
33 Citations
6 Claims
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1. A coil apparatus for a non-contact power transmission apparatus constituted by a power transmission coil apparatus to which AC power is input and a power receive coil apparatus which outputs AC power from the power transmission coil apparatus,
wherein one of the power transmission coil apparatus and the power receive coil apparatus includes: -
a first winding section which constitutes a first resonance circuit together with a first capacitance element, the first winding section being a transmission coil; a second winding section which constitutes an excitation coil, and which is magnetically coupled to the first winding section; and a third winding section which constitutes a second resonance circuit together with a second capacitance element, and which is magnetically coupled to the first winding section, the third winding section being a control coil that adjusts a resonance frequency of the first resonance circuit; and wherein (1) if the second winding is for the power transmission coil apparatus, the second winding is connected to a power source, and (2) if the second winding is for the power receive coil apparatus, the second winding is connected to a load; and the resonance frequency of the first resonance circuit is smaller than a resonance frequency of the second resonance circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification