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EP0435160A1 - Induktor - Google Patents

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Publication number
EP0435160A1
EP0435160A1 EP90124835A EP90124835A EP0435160A1 EP 0435160 A1 EP0435160 A1 EP 0435160A1 EP 90124835 A EP90124835 A EP 90124835A EP 90124835 A EP90124835 A EP 90124835A EP 0435160 A1 EP0435160 A1 EP 0435160A1
Authority
EP
European Patent Office
Prior art keywords
inductor
present
spiral
spiral coil
coil
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Withdrawn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
EP90124835A
Other languages
English (en)
French (fr)
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 EP0435160A1 publication Critical patent/EP0435160A1/de
Withdrawn legal-status Critical Current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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • 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
    • H01F2017/0066—Printed inductances with a magnetic layer

Definitions

  • the present invention relates generally to an inductor, and more particularly, to an inductor which has an improved induction characteristics.
  • FIGURES 1 and 2 show a side section and a plan section of the planar inductor 10, respectively.
  • a planar inductor 10 comprises a planar inductor element 12 and a base 14 for mounting the element 12 thereon (see FIGURE 1).
  • the planar inductor element 12 comprises a spiral coil 16 and a pair of magnetic layers 18, 20.
  • the spiral coil 16 is laid between the magnetic layers 18, 20 via insulating layers 22, 24.
  • the spiral coil 16 includes a conductor layer 26 and an insulator layer 28 which are coiled together (see FIGURE 2).
  • planar inductor 10 is adapted in a power supply circuit.
  • a specific characteristic of inductance to current e.g., a non-linear characteristics as shown in FIGURE 3
  • two planar inductors with different inductances have been used in series connection, as shown in FIGURE 4.
  • a first planar inductor 10a with a small inductance L1 and a second planar inductor 10b with a large inductance L2 are coupled in series within a power supply circuit 30.
  • the present invention therefore seeks to provide an improved inductor.
  • the present invention also seeks to provide an inductor having an inductance characteristic which is equivalent to that obtained by using a plurality of inductance elements.
  • An inductor includes a spiral coil consisting of a conductor material and an insulating material formed into a spiral together, wherein the conductor material in the spiral is selectively connected through the insulating material.
  • FIGURES 5 through 8 The present invention will be described in detail with reference to the FIGURES 5 through 8.
  • reference numerals or letters used in FIGURES 1 through 4 will be used to designate like or equivalent elements for simplicity of explanation.
  • FIGURES 5 and 6 an embodiment of the inductor according to the present invention will be described in detail.
  • the inductor is implemented as a planar inductor 10.
  • FIGURES 5 and 6 show a cross section and a plan section of the planar inductor 10, respectively.
  • the planar inductor 10 comprises a planar inductor element 12 and a base 14 for mounting the inductor element 12 thereon (see FIGURE 5).
  • the base 14 is, for instance, made of alumina.
  • the planar inductor element 12 comprises a spiral coil 16 and a pair of magnetic layers 18, 20.
  • the spiral coil 16 is laid between magnetic layers 18, 20 via insulating layers 22, 24, respectively.
  • the spiral coil 16 includes a conductor layer 26 and an insulator layer 28 which are coiled together (see FIGURE 6).
  • a bridging section A as shown in FIGURE 6, two adjacent turns 26a and 26b of the conductor layer 26 are electrically bridged with each other by a bridge connection 32 through the insulator layer 28.
  • the spiral coil 16 is separated into the inner and outer coil parts at the bridging section A.
  • the planar inductor 10 exhibits a non-linear inductance characteristics which is equivalent to that of FIGURE 3.
  • the non-linear D.C. biased current dependence of induction can be realized by a single element.
  • the same characteristic as that obtainable from two inductance elements can be obtained from a single inductance element, cost can be reduced below that of a conventional inductor, and also, the mounting density can be increased.
  • FIGURE 7 a modification of the planar inductor 10 will be described in brief.
  • a spiral coil 16 is formed by using a conventional print circuit technique.
  • the spiral coil 16 may be formed by a conductive coil pattern 26 printed on an insulative substrate 34.
  • the coil pattern 26 is separated into the inner and outer coil parts at a bridging section A.
  • two adjascent turns 26a and 26b of the coil pattern 26 are electrically bridged with each other by a bridge pattern 32.
  • the inner end of the coil pattern 26 is connected to a lead terminal 36 on the opposite surface of the substrate 34 via a through-hole 38.
  • the conductor coil or the coil pattern 26 of the spiral coil 16 is bridged at one portion, but it may be bridged at plural portions more than one.
  • FIGURE 8 shows such a modification of the inductor which is also implemented by using a print circuit technique.
  • the spiral coil 16 has two bridge portions A1 and A2.
  • the spiral coil can have any number of bridge portions more than two.
  • the inductor with the plural bridge portions becomes equivalent to those with a series circuit including a corresponding number of conventional inductor devices.
  • inductor can be implemented for many types of inductors, without being limited to the planar inductor.
  • a desired non-linear inductor characteristic can be obtained by an inductor with a very simple construction. Further, such an inductor can be accomplished at a low cost.
  • the present invention can provide an extremely preferable inductor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP90124835A 1989-12-28 1990-12-19 Induktor Withdrawn EP0435160A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP343628/89 1989-12-28
JP1343628A JPH03201511A (ja) 1989-12-28 1989-12-28 平面インダクタ

Publications (1)

Publication Number Publication Date
EP0435160A1 true EP0435160A1 (de) 1991-07-03

Family

ID=18363001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124835A Withdrawn EP0435160A1 (de) 1989-12-28 1990-12-19 Induktor

Country Status (3)

Country Link
EP (1) EP0435160A1 (de)
JP (1) JPH03201511A (de)
KR (1) KR910013322A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997020327A1 (en) * 1995-11-27 1997-06-05 Matsushita Electric Industrial Co., Ltd. Coiled component and its production method
DE19733360A1 (de) * 1997-08-01 1999-02-04 Leybold Systems Gmbh Schaltungsanordnung zum Nachweis elektrisch leitender Substanzen
CN1108614C (zh) * 1997-10-24 2003-05-14 株式会社村田制作所 电感及其生产方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB956284A (en) * 1959-11-11 1964-04-22 Philips Electrical Ind Ltd Improvements in or relating to tuning devices comprising a substantially circular line
US3688232A (en) * 1971-02-16 1972-08-29 Gabor Szatmari Capacitive inductive winding
US4494100A (en) * 1982-07-12 1985-01-15 Motorola, Inc. Planar inductors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB956284A (en) * 1959-11-11 1964-04-22 Philips Electrical Ind Ltd Improvements in or relating to tuning devices comprising a substantially circular line
US3688232A (en) * 1971-02-16 1972-08-29 Gabor Szatmari Capacitive inductive winding
US4494100A (en) * 1982-07-12 1985-01-15 Motorola, Inc. Planar inductors

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 108 (E-495)(2555) 04 April 1987, & JP-A-61 256611 (FUJITSU LTD) 14 November 1986, *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 7 (E-41)(679) 17 January 1981, & JP-A-55 138206 (NIPPON DENKI K.K.) 28 October 1980, *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997020327A1 (en) * 1995-11-27 1997-06-05 Matsushita Electric Industrial Co., Ltd. Coiled component and its production method
US6169470B1 (en) 1995-11-27 2001-01-02 Matsushita Electric Industrial Co., Ltd. Coiled component and its production method
CN1130735C (zh) * 1995-11-27 2003-12-10 松下电器产业株式会社 线圈元件
DE19733360A1 (de) * 1997-08-01 1999-02-04 Leybold Systems Gmbh Schaltungsanordnung zum Nachweis elektrisch leitender Substanzen
CN1108614C (zh) * 1997-10-24 2003-05-14 株式会社村田制作所 电感及其生产方法

Also Published As

Publication number Publication date
KR910013322A (ko) 1991-08-08
JPH03201511A (ja) 1991-09-03

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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: 19901219

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Effective date: 19920909