EP0450448A1 - Transformateur plat - Google Patents

Transformateur plat Download PDF

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Publication number
EP0450448A1
EP0450448A1 EP91104678A EP91104678A EP0450448A1 EP 0450448 A1 EP0450448 A1 EP 0450448A1 EP 91104678 A EP91104678 A EP 91104678A EP 91104678 A EP91104678 A EP 91104678A EP 0450448 A1 EP0450448 A1 EP 0450448A1
Authority
EP
European Patent Office
Prior art keywords
planar coils
flat
transformer
coils
planar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91104678A
Other languages
German (de)
English (en)
Inventor
Tetsuya Yokokawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Publication of EP0450448A1 publication Critical patent/EP0450448A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/0006—Printed inductances

Definitions

  • the present invention relates to a flat-type transformer having a thin compact size and light weight suitable for a transformer utilized for a power device, an invertor or an oscillator particularly for improving coefficient of coupling between a plurality of flat-type plane coils of the transformer.
  • a transformer is composed of a primary coil and a secondary coil both wound around iron cores.
  • These primary and secondary coils are generally formed of copper wires in form of coil, and accordingly, there is a limit for constructing the transformer having a thin and compact structure and light weight.
  • a planar coil such as sliced coil or inductance element in which a conductor element is printed on a print circuit substrate in a coiled or vortex (spiral) shape.
  • the sliced coil is usualy formed by first forming a spiral cylindrical member from an electroconductive thin band plate-like member having a predetermined width and then slicing the cylindrical member along the axial direction thereof so as to produce a plurality of sliced coil elements each having a required thickness.
  • Each of the thus formed sliced coil has of course a spiral or vortex shape.
  • a flat plane-type transformer, called flat transformer hereinlater, utilizing such sliced coils has been provided.
  • the flat transformer comprises a plurality of planar coils stacked with plate-like electric insulators interposed between adjacent planar coils.
  • the stacked structure of the planar coils and the insulators are sandwiched by a pair of magnetic members with the electric insulators also interposed between the magnetic members and the outermost planar coils, thereby to form a flat transformer provided with a pair of magnetic members formed as primary and secondary sides, respectively.
  • the conventional flat transformer comprises a plurality of planar coils having different outer diameters. Accordingly, the coefficient of coupling between the adjacent planar coils is low and, hence, the coefficient of conversion of the transformer itself is reduced, thus providing a significant problem. It is considered that this adverse phenomenon is caused by the increasing of the the leakage of the magnetic flux into a space formed by the difference in the outer diameter of the respective planar coils.
  • An object of the present invention is to substantially eliminate the defects encountered in the prior art and to provide a flat-type transformer having a compact structure capable of increasing the coefficient of coupling between the planar coils and improving the coefficient of conversion of the transformer.
  • a flat-type transformer comprising a plurality, at least two, of planar coils, a plate-like electric insulator disposed between adjacent two plane coils so as to form a stacked structure of the insulator and the planar coils, and a pair of magnetic members disposed on both the sides of the stacked structure with electric insulators being interposed between the magnetic members and the outermost planar coils, the planar coils having substantially the same outer diameter in the stacked structure.
  • each of the planar coils so as to have a vortex structure in a plane.
  • the coefficient of the coupling between the respective planar coils can be increased and the coefficient of conversion of the transformer can be also improved.
  • Fig. 2 shows one example of a planar coil 1 formed by coiling an electroconductive material 2 into a vortex shape in one plane.
  • Fig. 3 represents a flat transformer 3 constructed by utilizing the planar coil 1 such as shown in Fig. 2 and the flat transformer 3 comprises a plurality, three in the illustration, of planar coils 1a, 1b and 1c stacked with plate-like electric insulators 4 interposed between adjacent two planar coils 1a and 1b, for example.
  • the laminated structure of the planar coils 1 and the insulators 4 are sandwiched by a pair of upper and lower plate-like magnetic members 5a and 5b with the electric insulators 4 also interposed between the magnetic members 5a and 5b and the outermost planar coils 1a and 1c, thereby to form a flat transformer 3 provided with a pair of magnetic members 5a and 5b formed as primary and secondary sides, respectively.
  • the conventional flat transformer comprises a plurality of planar coils having different outer diameters. Accordingly, the coefficient of coupling between the adjacent two planar coils is low and, hence, the coefficient of conversion of the transformer itself is reduced. It is considered that this adverse phenomenon is caused by the increasing of the the leakage of the magnetic flux into a space formed by the difference in the outer diameter of the respective planar coils.
  • Fig. 4 shows the relation between the outer diameter ratio of the planar coils 1a to 1c and coefficient of coupling thereof.
  • the coefficient of coupling is largely reduced in comparison with a case where the planar coils have substantially the same outer diameter (i.e. the outer diameter ratio of 1 : 1).
  • a flat transformer 11 comprises a plurality, three in the illustration for the sake of convenience, of planar coils 12a, 12b and 12c, a plurality of plate-like electric insulators 13 and 13 each interposed between adjacent two planar coils 12a and 12b, for example, so as to form a stacked structure of the planar coils and the insulators, and a pair of upper and lower, as viewed, magnetic members 14a and 14b so as to sandwich the stacked structure therebetween with further insulators 13 interposed between the magnetic members and the outermost planar coils.
  • the respective planar coils 12a to 12c are formed of the electroconductive material.
  • the magnetic member 14a and 14b are constructed as the primary and secondary sides of the transformer 11.
  • the planar coils 12a to 12c are all formed so as to have substantially the same outer diameter.
  • This structure is very significant as understood from the disclosure of Fig. 4. According to this structure, since the outer diameter ratio becomes substantially 1 : 1, (i.e. 100% in the graph) the coefficient of coupling K between the respective planar coils 12a to 12c is remarkably improved, for example, to 0.95% and the coefficient of conversion as the transformer can be also remakably improved.
  • any other type planar coil may be utilized in place of vortex coil as described hereinabove as far as the coils have flat planar shapes and all have substantially the same outer diameters.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP91104678A 1990-03-29 1991-03-25 Transformateur plat Withdrawn EP0450448A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP78654/90 1990-03-29
JP2078654A JPH03280409A (ja) 1990-03-29 1990-03-29 平面トランス

Publications (1)

Publication Number Publication Date
EP0450448A1 true EP0450448A1 (fr) 1991-10-09

Family

ID=13667848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104678A Withdrawn EP0450448A1 (fr) 1990-03-29 1991-03-25 Transformateur plat

Country Status (2)

Country Link
EP (1) EP0450448A1 (fr)
JP (1) JPH03280409A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4317545A1 (de) * 1992-05-27 1993-12-02 Fuji Electric Co Ltd Dünnschichtübertrager
JP2017017103A (ja) * 2015-06-29 2017-01-19 株式会社村田製作所 コイル部品

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4997330B2 (ja) 2010-07-27 2012-08-08 株式会社神戸製鋼所 多相変圧器および変圧システム
JP2012060194A (ja) * 2010-07-27 2012-03-22 Kobe Steel Ltd 多相変圧器および変圧システム
KR20130072816A (ko) * 2011-12-22 2013-07-02 삼성전기주식회사 인덕터의 제조 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR981390A (fr) * 1948-12-31 1951-05-25 Procédé pour la constitution de bobinages électriques par empilage d'éléments préfabriqués
US3431144A (en) * 1963-12-26 1969-03-04 Nippon Electric Co Method for manufacturing microminiature coils
US3848210A (en) * 1972-12-11 1974-11-12 Vanguard Electronics Miniature inductor
GB2083952A (en) * 1980-09-11 1982-03-31 Asahi Chemical Ind Microcoil Assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR981390A (fr) * 1948-12-31 1951-05-25 Procédé pour la constitution de bobinages électriques par empilage d'éléments préfabriqués
US3431144A (en) * 1963-12-26 1969-03-04 Nippon Electric Co Method for manufacturing microminiature coils
US3848210A (en) * 1972-12-11 1974-11-12 Vanguard Electronics Miniature inductor
GB2083952A (en) * 1980-09-11 1982-03-31 Asahi Chemical Ind Microcoil Assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
W. Leonhard, J. Holtz, H.Ch. Skudelny: "3rd Europeen Conference on Power Electronics and Applications, Aachen 1989" October 1989, EPE '89 - Secretariat, Düsseldorf, *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4317545A1 (de) * 1992-05-27 1993-12-02 Fuji Electric Co Ltd Dünnschichtübertrager
JP2017017103A (ja) * 2015-06-29 2017-01-19 株式会社村田製作所 コイル部品

Also Published As

Publication number Publication date
JPH03280409A (ja) 1991-12-11

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19910325

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