COIL APPARATUS AND NON-CONTACT POWER TRANSMISSION APPARATUS

• US 20120043826A1
• Filed: 08/19/2011
• Published: 02/23/2012
• Est. Priority Date: 08/23/2010
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: SAITOH, Yoshihiro
• Granted Patent: US 9,070,505 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

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.

Claims

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 at least 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;

a second winkling section 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.

2. The coil apparatus according to claim 1, wherein a winding region formed by the third winding section is larger than a winding region formed by the second winding section, and in a plan view in a plane intersecting with a winding axis of the second winding section or the third winding section, the winding region formed by the second winding section is formed on the inside of the winding region formed by the third winding section.

3. The coil apparatus according to claim 1, wherein a winding region formed by the third winding section is larger than a winding region formed by the first winding section, and in a plan view in a plane intersecting with a winding axis of the first winding section or the third winding section, the winding region formed by the first winding section. is formed on the inside of the winding region formed by the third winding section.

4. The coil apparatus according to claim 1, wherein a resonance frequency of the first resonance circuit is smaller than a resonance frequency of the second resonance circuit.

5. A non-contact power transmission apparatus, comprising the coil apparatus according to claim 1.