US 9,070,505 B2Granted

Coil apparatus and non-contact power transmission apparatus

AssigneeTDK Corporation

InventorYoshihiro Saitoh

Life of this patent

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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.

Claims6

Dependent claims

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.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/213,574Filed 19 Aug 2011
Priority: JP P2010-18626223 Aug 2010
Published: US 2012/0043826 A123 Feb 2012
Granted: 30 Jun 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01F 38/14
Adaptations of transformers or inductances for specific applications or functions: inductive couplings
H02J 50/12
Using inductive coupling: of the resonant type
H02J 50/70
Circuit arrangements or systems for wireless supply or distribution of electric power: involving the reduction of electric, magnetic or…
H02J 50/40
Circuit arrangements or systems for wireless supply or distribution of electric power: using two or more transmitting or receiving devices