Patent ID: 9070505
Filing Date: 2015-06-30
Classification: H01F,H02J

Abstract:
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.