Inductance part

• US 8,009,007 B2
• Filed: 11/13/2009
• Issued: 08/30/2011
• Est. Priority Date: 11/26/2008
• Status: Expired due to Fees

• Current Assignee: Sanken Electric Company Limited
• Original Assignee: Sanken Electric Company Limited
• Inventors: Yamazaki, Sadahiro, Miyata, Tomohiro, Ishii, Shigenori, Utsuno, Mizuki
• Primary Examiner(s): NGUYEN, TUYEN T
• Application Number:
  US12/618,475
• Publication Number:
  US 20100127813A1
• Time in Patent Office: 655 Days
• Field of Search: 336/65, 336/83, 336/198, 336/200, 336/232
• US Class Current: 336/200
• CPC Class Codes: H01F 2027/2809 on stacked layers
• CPC Class Codes: H01F 2027/2819 Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/2828 Construction of conductive connections, of leads
• CPC Class Codes: H01F 27/2866 Combination of wires and sheets

Abstract

Since there exists a draw-out portion of a triple insulated wire in a winding structure of a transformer in which the triple insulated wire is used as a secondary winding, the thickness of the transformer is increased by an amount corresponding to the wire diameter of the draw-out portion. Further, when reduction of the thickness of the transformer is prioritized, the secondary winding can be provided only on one side, making it impossible to achieve the sandwich structure. Thus, the coupling between the primary and secondary windings has been sacrificed. An inductance part provided with a magnetic core, two or more sheet coils, and a winding includes: a bobbin constituted by at least two or more sheet coils; and a winding formed by winding a triple insulated wire between the two or more sheet coils constituting the bobbin. A triple insulated wire draw-out portion on the center side of the winding is drawn out to one outer surface side of the bobbin.

Claims

1. An inductance part provided with a magnetic core, a sheet coil, and an insulated wire, comprising:

a bobbin constituted by two or more sheet coils; and

a winding formed by winding the insulated wire between the two or more sheet coils constituting the bobbin, wherein

a draw-out wire on the center side of the winding passes through the center portion of the bobbin to be drawn out to one outer surface side of the bobbin.

2. The inductance part according to claim 1, wherein

a hole through which the magnetic core is inserted is formed in the sheet coil, and

a cut portion through which the draw-out wire of the winding passes is formed in the outer peripheral portion of the hole.

3. The inductance part according to claim 1, wherein

the draw-out wire on the center side of the winding that has been drawn out from the center portion of the bobbin is wound in the opposite direction to the winding on the one outer surface of the bobbin to form a winding.

4. The inductance part according to claim 1, wherein

the bobbin includes, between the two or more sheet coils, a spacer for forming a space within which the winding is accommodated.

5. The inductance part according to claim 4, wherein

the spacer is disposed between the winding and magnetic core.

6. The inductance part according to claim 5, wherein

a cut portion through which the draw-out wire of the winding passes is formed in the spacer.

7. The inductance part according to claim 4, wherein

the spacer is disposed so as to be brought into contact with the outer periphery of the winding.

8. The inductance part according to claim 1, wherein

another winding is disposed on another outer surface side opposite to the one outer surface side of the bobbin to which the draw-out wire is drawn out, and

a draw-out wire of the another winding on the center side thereof is drawn out, through the two or more sheet coils, to the one outer surface side of the bobbin to which the draw-out wire of the winding has been drawn out.

9. The inductance part according to claim 8, comprising:

three or more sheet coils; and

two or more windings sandwiched between the three or more sheet coils, wherein

draw-out wires of the two or more windings interposed between the three or more sheet coils are drawn out, through the three or more sheet coils sandwiching the two or more windings, to the one outer surface side of the bobbin.

10. The inductance part according to claim 6, wherein

the draw-out wire of the winding is wound in the opposite direction to the winding on the one outer surface of the bobbin to form a winding.

11. The inductance part according to claim 2, wherein

the bobbin includes, between the two or more sheet coils, a spacer for forming a space within which the winding is accommodated, and

a cut portion through which the draw-out wire of the winding passes is formed in the spacer.