PLANE COIL

• US 20110102125A1
• Filed: 06/22/2009
• Published: 05/05/2011
• Est. Priority Date: 07/04/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Electric Works Company Limited (Panasonic Holdings Corporation)
• Inventors: Suzuki, Masayuki, Tamura, Hideki, Ota, Tomohiro, Kada, Kyohei
• Granted Patent: US 8,362,868 B2
• Time in Patent Office: Days
• US Class Current: 336/232
• CPC Class Codes: H01F 2027/348 Preventing eddy currents
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/34 Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10

Abstract

A plane coil which reduces an increase of an effective resistance in a high-frequency area and is made thinner is provided. The plane coil is equipped with plural conductive wires which are parallel to each other, wherein the conductive wires are arranged in a plane and spirally wound, and coil ends of the respective conductive wires are electrically connected to each other at coil lead-out portions and thus are connected in parallel. The conductive wires are arranged in plane, so that a coil thickness does not increase, and the coil is made thinner. Moreover, the plural conductive wires are connected in parallel, an increase of an effective resistance due to an influence of a skin effect in a high-frequency area is reduced.

Claims

1. A plane coil equipped with plural conductive wires which are parallel to each other,

wherein the conductive wires are arranged in a plane and spirally wounded, and

coil ends of the respective conductive wires are electrically connected to each other at a coil lead-out portion and thus thereby the wires are connected in parallel.

2. The plane coil according to claim 1, wherein

an arrangement of inner and outer peripheries of the conductive wires, which are connected in parallel, are changed on a way of the winding of the conductive wires.

3. The plane coil according to claim 2, wherein

the arrangement of the conductive wires is changed even number of times per turn.

4. The plane coil according to claim 2, wherein

changing positions of the plural conductive wires are not lined up each other.

5. The plane coil according to claim 1, wherein

the conductive wires whose number is an even multiple number of wires connected in parallel are wound number of turns divided a predetermined number of turns by the even number,

the conductive wires whose arrangement of inner and outer peripheries are different from each other are connected in series at a coil lead-out portion to be the predetermined number of turns.

6. The plane coil according to claim 2, wherein

even numbers of coils which have either one of equal coil diameters and equal number of turns with each other are stacked, and

the conductive wires, whose arrangement of the inner and outer peripheries are different from each other, are changed at an arrangement between the coils and are connected in series.

7. The plane coil according to claim 1, wherein

the conductive wire is a copper wire.

8. The plane coil according to claim 1, wherein

the conductive wire is a copper foil pattern.

9. The plane coil according to claim 7, wherein

the copper wire is a litz wire.