Planar transformer

• US 9,401,243 B2
• Filed: 12/18/2014
• Issued: 07/26/2016
• Est. Priority Date: 06/21/2010
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Minsu
• Primary Examiner(s): Lian, Mangtin
• Application Number:
  US14/575,460
• Publication Number:
  US 20150102883A1
• Time in Patent Office: 586 Days
• Field of Search: 336/170, 336/192, 336/220, 336/232, 336/221, 336/212, 336/214, 336/215, 336/208, 336/198
• US Class Current: 1/1
• 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 27/00 Details of transformers or inductances, in general
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/306 Fastening or mounting coils or windings on core, casing or other support
• CPC Class Codes: H01F 27/323 Insulation between winding turns, between winding layers
• CPC Class Codes: H01F 27/325 Coil bobbins formers for coils in general H01F5/02

Abstract

The present invention relates to a planar transformer, the transformer including a core provided to induce formation of a magnetic field, a bobbin coupled to a core, at least one primary winding interposed between the core and the bobbin to supply a power signal, a first insulation unit provided to the at least one primary winding to insulate the at least one primary winding, at least one secondary winding provided to the first insulation unit and insulated by the first insulation unit to transform the power signal, and a second insulation unit provided to the at least one secondary winding to insulate the at least one secondary winding.

Claims

1. A planar transformer, comprising:

a core provided to induce formation of a magnetic field;

a bobbin coupled to the core;

at least one primary winding interposed between the core and the bobbin; and

at least one secondary winding interposed between the core and the bobbin, and insulated from the at least one primary winding;

wherein the core includes a first fastening lug and a second fastening lug distanced from the first fastening lug, and

wherein a shape of the first fastening lug is different from a shape of the second fastening lug,

wherein the first fastening lug is formed with a geometric shape different from that of the second fastening lug,

wherein the bobbin includes a first fastening hole to be coupled to the first fastening lug and a second fastening hole to be coupled to the second fastening lug,

wherein the first fastening hole has a geometric shape corresponding to the geometric shape of the first fastening lug, and

wherein the second fastening hole has a geometric shape corresponding to the geometric shape of the second fastening lug.

2. The planar transformer of claim 1, further comprising:

a first insulation unit provided to the at least one primary winding to insulate the at least one primary winding; and

a second insulation unit provided to the at least one secondary winding to insulate the at least one secondary winding,

wherein the at least one secondary winding is insulated from the at least one primary winding by the first and second insulation unit.

3. The planar transformer of claim 2, further comprising:

at least another secondary winding interposed between the core and the bobbin to be coupled to the first fastening unit and to transform the power signal by being distanced from the at least one primary winding and the at least one secondary winding, and

a third insulation unit provided to the at least another secondary winding to insulate the at least another secondary winding by being coupled to the first fastening unit.

4. The planar transformer of claim 3, further comprising:

at least another primary winding interposed between the core and the bobbin to be coupled to the first fastening lug and to transform the power signal by being distanced from the at least one primary winding and the at least one secondary winding, and a fourth insulation unit provided to the at least another primary winding to insulate the at least another primary winding by being coupled to the first fastening lug.

5. The planar transformer of claim 2, wherein the at least one primary winding and the at least one secondary winding each includes a metal thin film pattern layer having an inductance component.

6. The planar transformer of claim 5, wherein the metal thin film pattern layer having an inductance component includes a metal material having a high conductivity.

7. The planar transformer of claim 2, wherein the at least one primary winding and the at least one secondary winding each is provided in at least one of a circular shape, an oval shape, and a polygon shape.

8. The planar transformer of claim 4, wherein the at least one primary winding or the at least one secondary winding includes a metal thin film pattern layer having at least two or more inductance components and at least one primary insulation layer provided to the metal thin film pattern layer having the at least two or more inductance components to insulate the metal thin film pattern layer having the at least two or more inductance components.

9. The planar transformer of claim 4, wherein the at least another primary winding or the at least another secondary winding includes a metal thin film pattern layer having at least two or more inductance components, and the at least another primary insulation layer provided to the metal thin film pattern layer having the at least two or more inductance components to insulate the metal thin film pattern layer having the at least two or more inductance components.

10. The planar transformer of claim 1, further comprising:

a power signal supply unit coupled to one side of the bobbin and electrically connected to the at least one primary winding to supply the power signal to the at least one primary winding, and

a power signal output unit coupled to the other side of the bobbin and electrically connected to the at least another secondary winding to output a power signal transformed by the at least one secondary winding.

11. The planar transformer of claim 10, wherein the power signal supply unit and the power signal output unit each includes a metal material having a high conductivity.

12. The planar transformer claim 10, wherein power signal supply unit and the power signal output unit each is a terminal lug.

13. The planar transformer of claim 1, wherein the core includes a bottom core and an upper core.

14. The planar transformer of claim 4, wherein the at least one primary winding and the at least one secondary winding are provided at an upper surface of the bobbin or a bottom surface of the bobbin.

15. The planar transformer of claim 14, wherein the at least another secondary winding is provided at a bottom surface of the bobbin or an upper surface of the bobbin, and

wherein the at least another primary winding is provided at a bottom surface of the bobbin or an upper surface of the bobbin.

16. The planar transformer of claim 1, wherein the at least one primary winding includes a third fastening hole to be coupled to the first fastening lug that is coupled with the first fastening hole and a fourth fastening hole to be coupled to the second fastening lug that is coupled with the second fastening hole.

17. The planar transformer of claim 16, wherein the at least one primary winding includes a first region having the third fastening hole and a second region having the fourth fastening hole;

and

wherein the first region is overlapped with the at least one secondary winding in the bobbin and the second region is not overlapped with the at least one secondary winding in the bobbin.

18. The planar transformer of claim 1, wherein the at least one secondary winding is coupled to the first fastening lug and is not coupled to the second fastening lug.