EP0393599A2 - Surface mounted electric coil - Google Patents

Surface mounted electric coil Download PDF

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Publication number
EP0393599A2
EP0393599A2 EP90107283A EP90107283A EP0393599A2 EP 0393599 A2 EP0393599 A2 EP 0393599A2 EP 90107283 A EP90107283 A EP 90107283A EP 90107283 A EP90107283 A EP 90107283A EP 0393599 A2 EP0393599 A2 EP 0393599A2
Authority
EP
European Patent Office
Prior art keywords
coil
plastic
electrical
magnetic material
coil according
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.)
Granted
Application number
EP90107283A
Other languages
German (de)
French (fr)
Other versions
EP0393599A3 (en
EP0393599B1 (en
Inventor
Gerhard Dipl.-Ing. Meindl
Ernst Dipl.-Ing. Schmotz
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.)
TDK Electronics AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT90107283T priority Critical patent/ATE91038T1/en
Publication of EP0393599A2 publication Critical patent/EP0393599A2/en
Publication of EP0393599A3 publication Critical patent/EP0393599A3/en
Application granted granted Critical
Publication of EP0393599B1 publication Critical patent/EP0393599B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F2017/048—Fixed inductances of the signal type  with magnetic core with encapsulating core, e.g. made of resin and magnetic powder

Definitions

  • the invention relates to a surface-mountable, plastic-encased electrical coil with a hollow cylindrical coil body as a winding support and with a coil body flange that can be placed on a printed circuit board and preferably with electrical connections led out laterally.
  • SMD technology is becoming increasingly important, i.e. that increasingly unwired components are applied to the conductor track side of a circuit board and are usually mounted on it by wave soldering.
  • Novel circuit concepts, corresponding placement machines and a wide range of types of unwired components enable the transition to this new assembly technology.
  • SMD coils surface-mountable coils
  • SMD coils have a ferrite core in the hollow cylindrical part of the coil body and the entire coil, with the exception of its electrical connections, is coated with plastic.
  • This requires the manufacture and use of ferrite cores and, in addition, the work step of the cladding, which, taken together, requires a considerable amount of production technology.
  • the present invention is based on the object of providing an electrical coil of the type mentioned at the outset, which can be produced with considerably less manufacturing outlay than the known coil and is nevertheless distinguished by high quality.
  • the invention provides for a coil according to the preamble of claim 1 that the hollow cylindrical interior of the coil body and the coil are coated on all sides - with the exception of the electrical connections - with plastic, and that the plastic contains powdery magnetic material in high concentration.
  • a coil sheathing made of thermosetting or thermoplastic material and enriched in high concentration with ferrite powder or carbonyl iron replaces the previously required ferrite cores, particularly in the case of high-frequency coils.
  • the coil covered in this way is largely immersion-resistant and can be soldered onto a printed circuit board by means of wave soldering. This is of great advantage especially for surface-mountable electrical coils.
  • this coil is also characterized by considerable electrical and mechanical advantages. For example, components encased in this way can be positioned much easier and more precisely on PCBs with automatic assembly machines.
  • the known coil according to FIG. 1 has a coil former 1 with an annular and rectangular flange 2 or 3.
  • the flange 3 carries electrical connections 4 which are led out to the side and whose free ends can be soldered onto conductor tracks of a circuit board (not shown in the drawing).
  • a hatched ferrite core 7 is inserted into the hollow cylindrical interior of the coil body.
  • the wound coil is finally on all sides with a dashed envelope 5 made of plastic, e.g. overmoulded from thermosetting or thermoplastic material.
  • the ferrite core 7 according to FIG. 1 is omitted in the case of the electrical coil according to FIG. 2.
  • a sheathing 6 made of plastic which contains powdery, magnetic materials, e.g. Contains ferrite or carbonyl iron in high concentration.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Insulated Conductors (AREA)
  • Closures For Containers (AREA)
  • Magnetic Treatment Devices (AREA)

Abstract

A surface-mounted electric coil, surrounded with plastic (6), having a hollow-cylindrical coil former (1) as a winding support and having a coil former flange (3), which can be placed on a printed-circuit board, with electrical terminals (4) led out preferably on the sides, the hollow-cylindrical interior of the coil former (1) and the coil being surrounded on all sides - with the exception of the electrical terminals (4) - with plastic (6) and the plastic containing powdery magnetic material in a high concentration. <IMAGE>

Description

Die Erfindung betrifft eine oberflächenmontierbare, mit Kunst­stoff umhüllte elektrische Spule mit einen hohlzylindrischen Spulenkörper als Wickelträger und mit einem auf eine Leiter­platte aufsetzbaren Spulenkörperflansch mit bevorzugt seit­lich herausgeführten elektrischen Anschlüssen.The invention relates to a surface-mountable, plastic-encased electrical coil with a hollow cylindrical coil body as a winding support and with a coil body flange that can be placed on a printed circuit board and preferably with electrical connections led out laterally.

Im Zuge der fortschreitenden Automatisierung gewinnt die so­genannte SMD-Technik zunehmend an Bedeutung, d.h. daß in steigendem Maße unbedrahtete Bauelemente auf die Leiterbahnen­seite einer Schaltungsplatine aufgebracht und meist durch Schwallöten auf ihr montiert werden. Neuartige Schaltungs­konzepte, entsprechende Bestückungsautomaten sowie ein breit gefächertes Typenspektrum an unbedrahteten Bauelementen er­möglichen den Übergang zu dieser neuen Aufbautechnik.As automation progresses, so-called SMD technology is becoming increasingly important, i.e. that increasingly unwired components are applied to the conductor track side of a circuit board and are usually mounted on it by wave soldering. Novel circuit concepts, corresponding placement machines and a wide range of types of unwired components enable the transition to this new assembly technology.

Im Rahmen dieser Entwicklung stellt sich die Frage nach der Oberflächenmontierbarkeit auch für elektrische Spulen, Über­trager, Drosseln und dergleichen, deren Wickeldrähte um An­schlussbeine elektrischer Anschlüsse gewickelt und anschließend z.B. mittels Tauch- bzw. Schwallöten auf Schaltungsplatinen befestigt werden.In the course of this development, the question of surface mountability also arises for electrical coils, transformers, chokes and the like, the winding wires of which are wound around connecting legs of electrical connections and subsequently e.g. can be attached to circuit boards using dip or wave soldering.

Bereits vorgeschlagene, insbesondere für hochfrequente An­wendungszwecke geeignete, oberflächenmontierbare Spulen, d.h. sogenannte SMD-Spulen sind im hohlzylindrischen Spulenkörper­teil mit einem Ferritkern besetzt und die gesamte Spule, aus­genommen ihre elektrischen Anschlüsse, mit Kunststoff umhüllt. Dies erfordert die Fertigung und den Einsatz von Ferritkernen und zusätzlich den Arbeitsschritt der Umhüllung, was zusammen­genommen einen erheblichen fertigungstechnischen Aufwand be­dingt.Already proposed, in particular suitable for high-frequency applications, surface-mountable coils, ie so-called SMD coils, have a ferrite core in the hollow cylindrical part of the coil body and the entire coil, with the exception of its electrical connections, is coated with plastic. This requires the manufacture and use of ferrite cores and, in addition, the work step of the cladding, which, taken together, requires a considerable amount of production technology.

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, eine elektrische Spule der eingangs genannten Art zu schaffen, die mit im Vergleich zur bekannten Spule erheblich geringerem Fer­tigungsaufwand herstellbar ist und sich trotzdem durch eine hohe Qualität auszeichnet.The present invention is based on the object of providing an electrical coil of the type mentioned at the outset, which can be produced with considerably less manufacturing outlay than the known coil and is nevertheless distinguished by high quality.

Zur Lösung dieser Aufgabe sieht die Erfindung bei einer Spule gemäß Oberbegriff des Patentanspruchs 1 vor, daß das hohl­zylindrische Innere des Spulenkörpers und die Spule allseitig - ausgenommen die elektrischen Anschlüsse - mit Kunststoff um­hüllt sind, und daß der Kunststoff pulverförmigen magnetischen Werkstoff in hoher Konzentration enthält.To achieve this object, the invention provides for a coil according to the preamble of claim 1 that the hollow cylindrical interior of the coil body and the coil are coated on all sides - with the exception of the electrical connections - with plastic, and that the plastic contains powdery magnetic material in high concentration.

Eine aus duro - oder thermoplastischem Kunststoff bestehende und in hoher Konzentration mit Ferritpulver oder Carbonyleisen angereicherte Spulenumhüllung ersetzt insbesondere bei hoch­frequenten Spulen die bisher erforderlichen Ferritkerne.A coil sheathing made of thermosetting or thermoplastic material and enriched in high concentration with ferrite powder or carbonyl iron replaces the previously required ferrite cores, particularly in the case of high-frequency coils.

Wird beispielsweise das Ferritpulver oder Carbonyleisen in hochtemperaturfeste Kunststoffe, wie z.B. Polyphenylensulfid oder Flüssigkristallpolymere eingemischt, so ist die so um­hüllte Spule weitgehend tauchlötfest und kann mitteils Schwallöten auf eine Leiterplatte aufgelötet werden. Vor allem für oberflächenmontierbare elektrische Spulen ist dies von großem Vorteil. Zusätzlich zeichnet sich diese Spule auch durch erhebliche elektrische und mechanische Vorteile aus. So lassen sich beispielsweise derart umhüllte Bauelemente erheblich einfacher und genauer mit Bestückungsautomaten auf Leiterplatten positionieren.For example, if the ferrite powder or carbonyl iron is used in high-temperature-resistant plastics, e.g. If polyphenylene sulfide or liquid crystal polymers are mixed in, the coil covered in this way is largely immersion-resistant and can be soldered onto a printed circuit board by means of wave soldering. This is of great advantage especially for surface-mountable electrical coils. In addition, this coil is also characterized by considerable electrical and mechanical advantages. For example, components encased in this way can be positioned much easier and more precisely on PCBs with automatic assembly machines.

Die Erfindung wird nachstend anhand eines Ausführungsbeispieles näher erläutert. Es zeigt:

  • FIG 1 in schematischer und perspektivischer Darstellung eine bekannte SMD-gerechte elektrische Spule
  • FIG 2 in der Darstellung nach FIG 1 eine elektrische Spule nach der Erfindung, wobei gleiche Teile mit gleichen Bezugszeichen bezeichnet sind.
The invention is explained in more detail below using an exemplary embodiment. It shows:
  • 1 shows a schematic and perspective representation of a known SMD-compliant electrical coil
  • 2 shows an electrical coil in the illustration according to FIG according to the invention, the same parts being designated by the same reference numerals.

Die bekannte Spule gemäß FIG 1 besitz einen Spulenkörper 1 mit einem ring- und rechteckförmigen Flansch 2 bzw. 3. Der Flansch 3 trägt seitlich herausgeführte elektrische An­schlüsse 4, deren freie Enden auf Leiterbahnen einer in der Zeichnung nicht dargestellten Leiterplatte auflötbar sind.The known coil according to FIG. 1 has a coil former 1 with an annular and rectangular flange 2 or 3. The flange 3 carries electrical connections 4 which are led out to the side and whose free ends can be soldered onto conductor tracks of a circuit board (not shown in the drawing).

In das hohlzylindrische Innere des Spulenkörpers ist ein schraffiert angedeuteter Ferritkern 7 eingesetzt. Die be­wickelte Spule ist schließlich allseitig mit einer strich­liniert angedeuteten Umhüllung 5 aus Kunststoff, z.B. aus duro- oder thermoplatischem Material umspritzt.A hatched ferrite core 7 is inserted into the hollow cylindrical interior of the coil body. The wound coil is finally on all sides with a dashed envelope 5 made of plastic, e.g. overmoulded from thermosetting or thermoplastic material.

Im Unterschied hierzu entfällt bei der elektrischen Spule nach FIG 2 der Ferritkern 7 gemäß FIG 1. An desen Stelle tritt eine Umhüllung 6 aus Kunststoff, die pulverförmige, magne­tischen Werkstoffe, z.B. Ferrit oder Carbonyleisen in hoher Konzentration enthält.In contrast to this, the ferrite core 7 according to FIG. 1 is omitted in the case of the electrical coil according to FIG. 2. At its location there is a sheathing 6 made of plastic, which contains powdery, magnetic materials, e.g. Contains ferrite or carbonyl iron in high concentration.

Die Umhüllung ist nicht auf die gezeigte kubische Form be­schränkt. Sie kann in beliebig anderer Form in bzw. um den Spulenkörper bzw. die Wicklung gespritzt sein.The envelope is not limited to the cubic shape shown. It can be injected in any other form in or around the bobbin or the winding.

Claims (6)

1. Oberflächenmontierbare, mit Kunststoff umhüllte elektrische Spule mit einem hohlzylindrischen Spulenkörper als Wickelträger und mit einem auf eine Leiterplatte aufsetzbaren Spulenkörper­flansch mit bevorzugt seitlich herausgeführten elektrischen An­schlussen, dadurch gekennzeichnet, daß das hohlzylindrische Innere des Spulenkörpers 1 und die Spule allseitig - ausgenommen die elektrischen Anschlüsse 4 - mit Kunststoff 6 umhüllt sind, und daß der Kunststoff pulver­förmigen magnetischen Werkstoff in hoher Konzentration enthält.1.Surface-mountable, plastic-coated electrical coil with a hollow cylindrical coil body as winding support and with a coil body flange which can be placed on a printed circuit board and preferably with electrical connections led out to the side, characterized in that the hollow cylindrical interior of the coil body 1 and the coil on all sides - with the exception of the electrical connections 4 - Are coated with plastic 6, and that the plastic contains powdery magnetic material in high concentration. 2. Elektrische Spule nach Anspruch 1, gekennzeich­net durch die Verwendung von hochtemperaturfesten Kunststoffen.2. Electrical coil according to claim 1, characterized by the use of high temperature resistant plastics. 3. Elektrische Spule nach Anspruch 1, gekennzeich­net durch die Verwendung von thermoplastischem Kunst­stoff als Umhüllung .3. Electrical coil according to claim 1, characterized by the use of thermoplastic material as a sheath. 4. Elektrische Spule nach Anspruch 2, gekennzeich­net durch die Verwendung von duroplastischem Kunst­stoff als Umhüllung .4. Electrical coil according to claim 2, characterized by the use of thermosetting plastic as a covering. 5. Elektrische Spule nach Anspruch 1, dadurch ge­kennzeichnet, daß als magnetischer Werkstoff Ferritpulver vorgesehen ist.5. Electrical coil according to claim 1, characterized in that ferrite powder is provided as the magnetic material. 6. Elektrische Spule nach Anspruch 1, dadurch ge­kennzeichnet, daß als magnetischer Werkstoff Carbonyleisen vorgesehen ist.6. Electrical coil according to claim 1, characterized in that carbonyl iron is provided as the magnetic material.
EP90107283A 1989-04-19 1990-04-17 Surface mounted electric coil Expired - Lifetime EP0393599B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90107283T ATE91038T1 (en) 1989-04-19 1990-04-17 SURFACE MOUNT ELECTRICAL COIL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912890 1989-04-19
DE3912890 1989-04-19

Publications (3)

Publication Number Publication Date
EP0393599A2 true EP0393599A2 (en) 1990-10-24
EP0393599A3 EP0393599A3 (en) 1991-01-09
EP0393599B1 EP0393599B1 (en) 1993-06-23

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EP90107283A Expired - Lifetime EP0393599B1 (en) 1989-04-19 1990-04-17 Surface mounted electric coil

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EP (1) EP0393599B1 (en)
AT (1) ATE91038T1 (en)
DE (1) DE59001832D1 (en)
ES (1) ES2044294T3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933425A1 (en) * 1989-10-06 1991-04-11 Staiger Mohilo & Co Gmbh Prodn. of tubular coil holder - by mixing epoxide] resin and iron particles, centrifuging mix inside tube and curing to form uniform void free product
US6696638B2 (en) 1998-07-10 2004-02-24 Epcos Ag Application and production of a magnetic product
DE102015211734A1 (en) * 2015-06-24 2016-12-29 SUMIDA Components & Modules GmbH SMD component

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2108769A (en) * 1981-09-04 1983-05-18 Toko Inc Arrangement of terminals on a chip type inductor
DE3510638C1 (en) * 1985-03-23 1986-10-16 Neosid Pemetzrieder Gmbh & Co Kg, 5884 Halver Inductive miniature component, especially a miniature coil, and a method for producing such a component
US4890085A (en) * 1987-10-21 1989-12-26 Tdk Electronic Co., Ltd. Terminal fitted bobbin
DE3820976A1 (en) * 1988-06-22 1989-12-28 Vogt Electronic Ag SMD inductor or transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2108769A (en) * 1981-09-04 1983-05-18 Toko Inc Arrangement of terminals on a chip type inductor
DE3510638C1 (en) * 1985-03-23 1986-10-16 Neosid Pemetzrieder Gmbh & Co Kg, 5884 Halver Inductive miniature component, especially a miniature coil, and a method for producing such a component
US4890085A (en) * 1987-10-21 1989-12-26 Tdk Electronic Co., Ltd. Terminal fitted bobbin
DE3820976A1 (en) * 1988-06-22 1989-12-28 Vogt Electronic Ag SMD inductor or transformer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933425A1 (en) * 1989-10-06 1991-04-11 Staiger Mohilo & Co Gmbh Prodn. of tubular coil holder - by mixing epoxide] resin and iron particles, centrifuging mix inside tube and curing to form uniform void free product
US6696638B2 (en) 1998-07-10 2004-02-24 Epcos Ag Application and production of a magnetic product
US7011764B2 (en) 1998-07-10 2006-03-14 Epcos Ag Method for producing a magnetic device
DE102015211734A1 (en) * 2015-06-24 2016-12-29 SUMIDA Components & Modules GmbH SMD component

Also Published As

Publication number Publication date
EP0393599A3 (en) 1991-01-09
ES2044294T3 (en) 1994-01-01
ATE91038T1 (en) 1993-07-15
EP0393599B1 (en) 1993-06-23
DE59001832D1 (en) 1993-07-29

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