EP0351861A1 - Inductive component, especially a transformer - Google Patents

Inductive component, especially a transformer Download PDF

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Publication number
EP0351861A1
EP0351861A1 EP89113372A EP89113372A EP0351861A1 EP 0351861 A1 EP0351861 A1 EP 0351861A1 EP 89113372 A EP89113372 A EP 89113372A EP 89113372 A EP89113372 A EP 89113372A EP 0351861 A1 EP0351861 A1 EP 0351861A1
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EP
European Patent Office
Prior art keywords
winding
connecting elements
core
component according
toroidal core
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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.)
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EP89113372A
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German (de)
French (fr)
Inventor
Horst Ing. Scheffler (Grad.)
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Siemens AG
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Siemens AG
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    • 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
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H01F2005/046—Details of formers and pin terminals related to mounting on printed circuits

Definitions

  • the invention relates to an inductive component, in particular a choke coil or a transformer, for. B. pulse, power, broadband transformer u.
  • an inductive component in particular a choke coil or a transformer, for. B. pulse, power, broadband transformer u.
  • a toroidal core made of ferromagnetic material, depending on the application, at least one winding applied to the toroidal core and connecting elements for connecting the winding ends.
  • ring cores made of ferromagnetic material, usually. H. so-called ferrite ring cores are used.
  • the advantages mentioned with regard to their magnetic values were bought through a complex winding technique due to the toroidal core.
  • the winding ends were wound onto the preferably pin-shaped connection elements of the connection carriers and the winding of toroidal cores of smaller diameter was carried out by hand.
  • the winding devices for toroidal cores which have become known in recent times and which automatically fix the winding ends to the connection elements, now offer the possibility of automatic loading and winding of the toroidal cores or their connection elements.
  • a holder for the wound toroidal cores there is a one-piece toroidal core holder equipped with the connecting elements, which can be used both for conventional assembly, e.g. B. circuit boards, as well as for the so-called. Surface mounting of the components.
  • Transmitter z. B. intended for use at higher voltages, require electrical insulation between the toroid and the winding.
  • a known embodiment of such components therefore provides toroidal cores that can be painted or Vertebral sintering with a z. B. 0.4 mm thick plastic layer are insulated from the winding.
  • connection carriers The ring cores treated and wound in this way are usually applied to a separate connection carrier and their winding ends are soldered to the connection pins of this connection carrier.
  • the design of these connection carriers and the sequence of the individual manufacturing and assembly steps do not allow automatic loading and unwinding.
  • FIG. 1 in plan view or in FIG. 2 in a section along line 2, 2 according to FIG. 1, a ferrite toroidal core 1 is inserted into an annular holding pot 2 made of insulating material. In the area of its open end face, this holding pot is closed by means of a cover 3 made of insulating material. Eyes 4, 5, 8, 9 are injection-molded in one piece onto the opposite end face of the mounting pot, into which connection pins 6, 7, 12 and 13 are injected. The winding ends of the windings wound on the holder pot 2 are, as z. B. for the winding end 11 of the winding 10 shown in Figure 1, wound on the corresponding pins and soldered to them.
  • this embodiment can be wound automatically, it has the disadvantage that the completely tight pressing of the cover into the holder pot is generally not possible, so that inadmissibly short creepage distances occur between the windings and the toroidal core, which are only used by means of a greater wall thickness Plastic parts can be extended to a permissible level.
  • this wound version is immersed in the wave pool, there is also the risk that the lid will be pressed outwards by the increased pressure that occurs in the interior of the holder pot.
  • the present invention has for its object to provide an inductive component or a holder for this component, which avoids the aforementioned disadvantages, i. H. in particular the fully automatic production of these preferably surface-mountable components.
  • the invention provides in a component according to the preamble of claim 1 that the toroid is directly overmolded with high-temperature-resistant plastic and that in its adjacent areas to at least one of the end faces of the ring core, z. B. pins are injected.
  • the layer or wall thickness of the plastic covering can also be chosen to be so thin that, if the holding function is maintained, any VDE regulations can still be observed. By means of relatively thin wall thicknesses, a correspondingly enlarged changing space can finally be created.
  • extruded toroidal cores which are easier to manufacture and extruded can also be used instead of extruded toroidal cores.
  • partitions can be molded onto the plastic layer, through which z. B. for winding insulation or for layered winding in multi-layer windings, the holder can be divided into individual mutually insulated chambers without great effort.
  • the z. B. pin-shaped connections can be replaced by L-shaped, which are led out in the area of the end face of the ring core transversely to the longitudinal central axis of the ring core.
  • the surface-mountable component can be soldered onto the circuit board by means of IR soldering, vapor phase soldering or wave soldering, without causing damage to the plastic casing of the toroid fear. This provides an SMD component that is suitable for mixed assembly and also for double-sided SMD assembly.
  • 4 is a z. B. extruded ring core 20 with a high-temperature resistant plastic layer 21. Eyes 22, 24, 26, 28, into which connection pins 23, 25, 27, 29 are embedded, are injection molded onto the lower end face of the plastic layer 21, viewed in the plane of the drawing.
  • One-piece partitions 30 to 33 are preferably injection molded onto the plastic layer 21, through which the peripheral surface of the components is in each case in separate chambers for the individual windings - for. B. for the winding 40 - is divided.
  • the transformer designed in this way ensures perfect winding insulation and creates the prerequisites for a position-oriented and automated winding and winding of the winding ends 41 onto the connecting pins.
  • the SMD-compliant transformer version according to FIG. 5 shows a ferrite ring core 50 with an encapsulated plastic layer 51 and molded partitions 56, 57 and 58.
  • L-shaped connecting elements e.g. B. terminal lugs 52 to 54, injected, which lead out transversely to the longitudinal central axis of the ring core 50 and are curved in their free ends so that a SMD - suitable assembly of the components is possible. If one also observes a certain height of the partition walls 56 to 58 in the area of the connection elements 52 to 54, then a minimum distance from the surface of the circuit board required for the components and the windings is also ensured in the case of SMD assembly.

Abstract

Inductive component, especially a transformer, reactor and the like having an annular core (20) made of ferromagnetic material, at least one winding (40) applied to the annular core (20) and connection elements (23, 25, 27, 29) for connecting the winding ends (41), the annular core (20) being sprayed all round directly with preferably high-temperature resistant plastic (21) and connection elements (23, 25, 27, 29) being sprayed in in the region thereof on the bottom side of the annular core. <IMAGE>

Description

Die Erfindung betrifft ein induktives Bauelement, insbesondere eine Drosselspule oder einen Übertrager, z. B. Impuls-,Leistungs-, Breitbandübertrager u. dgl., mit einem Ringkern aus ferromagne­tischem Material, je nach Anwendungsfall mindestens einer auf den Ringkern aufgebrachten Wicklung und Anschlußelementen zum Anschluß der Wickelenden.The invention relates to an inductive component, in particular a choke coil or a transformer, for. B. pulse, power, broadband transformer u. Like., With a toroidal core made of ferromagnetic material, depending on the application, at least one winding applied to the toroidal core and connecting elements for connecting the winding ends.

Für Übertrager, die sich durch geringes magnetisches Streufeld und durch eine im Verhältnis zu ihrem Volumen hohe magnetische Permeabilität auszeichnen, gelangen üblicherweise Ringkerne aus ferromagnetischem Material, d. h. sog. Ferrit-Ringkerne zum Einsatz. Die erwähnten Vorteile hinsichtlich ihrer magnetischen Werte wurden bis vor kurzem durch eine durch den Ringkern be­dingte, aufwendige Wickeltechnik erkauft. So erfolgte das An­wickeln der Wicklungsenden an die bevorzugt stiftförmigen Anschlußelemente der Anschlußträger und das Bewickeln von Ringkernen kleineren Durchmessers grundsätzlich von Hand.For transformers which are characterized by a low magnetic stray field and by a high magnetic permeability in relation to their volume, ring cores made of ferromagnetic material, usually. H. so-called ferrite ring cores are used. Until recently, the advantages mentioned with regard to their magnetic values were bought through a complex winding technique due to the toroidal core. For example, the winding ends were wound onto the preferably pin-shaped connection elements of the connection carriers and the winding of toroidal cores of smaller diameter was carried out by hand.

Durch die in jüngerer Zeit bekanntgewordenen Wickelvorrichtungen für Ringkerne, welche die Wicklungsenden an den Anschlußelementen automatisch fixieren, ist nunmehr jedoch die Möglichkeit des selbsttätigen Be- und Anwickelns der Ringkerne bzw. ihrer Anschlußelemente gegeben. Als Halterung für die bewickelten Ringkerne bietet sich dabei eine mit den Anschlußelementen ausgerüstete einstückige Ringkernhalterung an, die sowohl für konventionelle Bestückung, z. B. von Schaltungsplatinen, als auch für die sog. Oberflächenmontage der Bauelemente geeignet ist.The winding devices for toroidal cores, which have become known in recent times and which automatically fix the winding ends to the connection elements, now offer the possibility of automatic loading and winding of the toroidal cores or their connection elements. As a holder for the wound toroidal cores, there is a one-piece toroidal core holder equipped with the connecting elements, which can be used both for conventional assembly, e.g. B. circuit boards, as well as for the so-called. Surface mounting of the components.

Übertrager, die z. B. für den Einsatz bei höheren Spannungen be­stimmt sind, benötigen zwischen Ringkern und Wicklung eine elektrische Isolation. Eine bekannte Ausführung solcher Bau­elemente sieht daher Ringkerne vor, die mittels Lackieren oder Wirbelsintern mit einer z. B. 0,4 mm dicken Kunststoffschicht gegenüber der Wicklung isoliert sind.Transmitter z. B. intended for use at higher voltages, require electrical insulation between the toroid and the winding. A known embodiment of such components therefore provides toroidal cores that can be painted or Vertebral sintering with a z. B. 0.4 mm thick plastic layer are insulated from the winding.

Die so behandelten und gewickelten Ringkerne sind üblicherweise auf einen gesonderten Anschlußträger aufgebracht und ihre Wicklungsenden an die Anschlußstifte dieser Anschlußträger angelötet. Die Gestaltung dieser Anschlußträger und die Abfolge der einzelnen Fertigungs- und Montageschritte läßt dabei keine automatische Be- und Anwicklung zu.The ring cores treated and wound in this way are usually applied to a separate connection carrier and their winding ends are soldered to the connection pins of this connection carrier. The design of these connection carriers and the sequence of the individual manufacturing and assembly steps do not allow automatic loading and unwinding.

In einer weiteren, in Fig. 1 in Draufsicht bzw. in Fig. 2 in einem Schnitt gemäß der Linie 2,2 nach Figur 1 gezeigten, bekannten Ausführung, ist ein Ferrit-Ringkern 1 in einen aus Isoliermaterial gefertigten ringförmigen Halterungstopf 2 eingesetzt. Im Bereich seiner offenen Stirnfläche ist dieser Halterungstopf mittels eines aus Isolierstoff gefertigten Deckels 3 geschlossen. An die hierzu gegenüberliegende Stirn­fläche des Halterungstopfs sind Augen 4, 5, 8, 9 einstückig angespritzt, in welche Anschlußstifte 6, 7, 12, bzw. 13 eingespritzt sind. Die Wicklungsenden der auf den Halterungstopf 2 aufgewickelten Wicklungen sind, wie dies z. B. für das Wicklungsende 11 der Wicklung 10 gemäß Figur 1 gezeigt ist, an die entsprechenden Anschlußstifte angewickelt und an diese angelötet.In a further known embodiment shown in FIG. 1 in plan view or in FIG. 2 in a section along line 2, 2 according to FIG. 1, a ferrite toroidal core 1 is inserted into an annular holding pot 2 made of insulating material. In the area of its open end face, this holding pot is closed by means of a cover 3 made of insulating material. Eyes 4, 5, 8, 9 are injection-molded in one piece onto the opposite end face of the mounting pot, into which connection pins 6, 7, 12 and 13 are injected. The winding ends of the windings wound on the holder pot 2 are, as z. B. for the winding end 11 of the winding 10 shown in Figure 1, wound on the corresponding pins and soldered to them.

Diese Ausführungsform ist zwar automatisch bewickelbar, sie hat jedoch den Nachteil, daß im allgemeinen das völlig dichte Einpressen des Deckels in den Halterungstopf nicht möglich ist, so daß häufig unzulässig kurze Kriechstrecken zwischen den Wicklungen und dem Ringkern auftreten, die nur mittels größerer Wanddicke der verwendeten Kunststoffteile auf ein zulässiges Maß verlängerbar sind. Beim Eintauchen dieser bewickelten Ausführung ins Schwallbad besteht zudem die Gefahr, daß der Deckel durch den dabei im Halterungstopfinneren auftretenden erhöhten Druck nach außen gedrückt wird.Although this embodiment can be wound automatically, it has the disadvantage that the completely tight pressing of the cover into the holder pot is generally not possible, so that inadmissibly short creepage distances occur between the windings and the toroidal core, which are only used by means of a greater wall thickness Plastic parts can be extended to a permissible level. When this wound version is immersed in the wave pool, there is also the risk that the lid will be pressed outwards by the increased pressure that occurs in the interior of the holder pot.

Einige der vorerwähnten Probleme sind zwar behebbar, wenn der Deckel mittels Ultraschallschweißung auf den Halterungstopf aufgeschweißt wird; es verbleibt jedoch der Nachteil, daß der Ringkern, bedingt durch die erforderliche Toleranz seiner Kern­abmessungen, im Halterungstopfinneren erheblichen Spielraum be­sitzt. Die Ultraschallschweißung führt zudem zu Schweißnähten und erfordert allgemein dickere Wandstärken der zu verschweißen­den Kunststoffteile, wodurch widerum die elektrische Kopplung beeinträchtigt werden kann.Some of the aforementioned problems can be remedied if the cover is ultrasonically welded onto the holder pot; however, there remains the disadvantage that the toroidal core, due to the required tolerance of its core dimensions, has considerable scope inside the holder pot. Ultrasonic welding also leads to weld seams and generally requires thicker walls of the plastic parts to be welded, which in turn can impair the electrical coupling.

Neben größerem Montageaufwand spricht gegen diese bekannte Ausführung auch, daß eine z. B. bei gewünschter Kriechstrecken­verlängerung zwischen den einzelnen Wicklungen erforderliche Aufteilung in Wickelkammern, ähnlich den herkömmlichen Mehr­kammer-Spulenkörpern, nur mit aufwendiger Gestaltung der Kunst­stoffteile möglich ist.In addition to greater assembly costs speak against this known design that a z. B. with the desired creepage distance between the individual windings required division into winding chambers, similar to the conventional multi-chamber bobbins, is only possible with an elaborate design of the plastic parts.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde ein induk­tives Bauelement bzw. eine Halterung für dieses Bauelement zu schaffen, das die vorerwähnten Nachteile vermeidet, d. h. ins­besondere die vollautomatische Fertigung dieser bevorzugt auch oberflächenmontierbaren Bauelemente zuläßt.The present invention has for its object to provide an inductive component or a holder for this component, which avoids the aforementioned disadvantages, i. H. in particular the fully automatic production of these preferably surface-mountable components.

Zur Lösung dieser Aufgabe sieht die Erfindung bei einem Bau­element gemäß Oberbegriff des Patentanspruches 1 vor, daß der Ringkern unmittelbar mit hochtemperaturfestem Kunststoff um­spritzt ist und daß in dessen zu mindestens einer der Ringkern-­Stirnflächen benachbarten Bereiche Anschlußelemente, z. B. An­schlußstifte eingespritzt sind.To achieve this object, the invention provides in a component according to the preamble of claim 1 that the toroid is directly overmolded with high-temperature-resistant plastic and that in its adjacent areas to at least one of the end faces of the ring core, z. B. pins are injected.

Durch die vollständige Umspritzung des Ringkerns mittels Kunst­stoff, z. B. in einer Schichtdicke von etwa 0,4 mm, ist eine einwandfreie elektrische Isolierung des Ringkerns gegen die Wicklung gewährleistet. Durch die Umspritzung des Ringkerns mit Kunststoff wird letzlich eine Halterung geschaffen, die eine unverrückbare Positionierung des Ringkerns in der Halte­rung bewirkt.Due to the complete encapsulation of the toroidal core by means of plastic, for. B. in a layer thickness of about 0.4 mm, a perfect electrical insulation of the toroidal core against the winding is guaranteed. The encapsulation of the toroidal core with plastic ultimately creates a holder which causes the toroidal core to be immovably positioned in the holder.

Durch das vollständige Umspritzen des Ringkerns wird im übrigen an den Umlenkstellen des Wicklungsdrahtes eine Gratbildung ver­mieden, die insbesondere bei dünnen Drähten die Gefahr von Drahtrissen und Lackbeschädigungen in sich birgt. Auch kann die Schicht- bzw. Wanddicke der Kunststoffumhüllung so dünn gewählt werden, daß bei Aufrechterhaltung der Halterungs-Funktion auch eventuelle VDE-Vorschriften noch eingehalten werden können. Durch verhältnismäßig dünne Wanddicken kann schließlich ein entsprechend vergrößerter Wickelraum geschaffen werden.By completely encapsulating the toroidal core, burr formation is avoided at the deflection points of the winding wire, which, particularly in the case of thin wires, entails the risk of wire cracks and damage to the lacquer. The layer or wall thickness of the plastic covering can also be chosen to be so thin that, if the holding function is maintained, any VDE regulations can still be observed. By means of relatively thin wall thicknesses, a correspondingly enlarged changing space can finally be created.

Da bei Umspritzung der Ringkerne mit Kunststoff die elektrischen Wicklungen nicht unmittelbar auf dem Ringkern aufliegen und folglich zur Vermeidung von Draht- und Lackbrüchen die Stirn­kanten des Ringkerns nicht verrundet sein müssen, sind an Stelle von formgepreßten aufwendigen Ringkernen auch ein­facher herstellbare, stranggepreßte Ringkerne verwendbar.Since the electrical windings do not rest directly on the toroid when the toroidal cores are encapsulated with plastic, and consequently the end edges of the toroidal core do not have to be rounded in order to avoid wire and lacquer breaks, extruded toroidal cores which are easier to manufacture and extruded can also be used instead of extruded toroidal cores.

Gemäß einem weiteren Vorschlag nach der Erfindung können an die Kunststoffschicht Trennwände angespritzt sein, durch welche z. B. zur Wicklungsisolation oder zum lagengerechten Wickeln bei mehrlagigen Wicklungen die Halterung ohne großen Aufwand in einzelne gegeneinander isolierte Kammern aufteilbar ist.According to a further proposal according to the invention, partitions can be molded onto the plastic layer, through which z. B. for winding insulation or for layered winding in multi-layer windings, the holder can be divided into individual mutually insulated chambers without great effort.

Die z. B. stiftförmigen Anschlüsse können durch L-förmige er­setzt sein, die im Bereich der Ringkernstirnfläche quer zur Längsmittelachse des Ringkerns herausgeführt sind. Durch die Verwendung dieser Anschlußelemente und hochtemperaturfester Kunststoffe erhält man Übertrager in sog. SMD-Ausführung; d. h. oberflächenmontierbare Übertrager.The z. B. pin-shaped connections can be replaced by L-shaped, which are led out in the area of the end face of the ring core transversely to the longitudinal central axis of the ring core. Through the use of these connection elements and high-temperature-resistant plastics, transformers are obtained in the so-called SMD version; d. H. surface mount transformers.

Werden dabei die Wicklungsenden an die Anschlußelemente ange­schweißt bzw. mit einem bevorzugt erst bei Temperaturen über 260 °C schmelzenden Lot angelötet und verwendet man einen hochtemperaturbeständigen Wickeldraht, z. B. einem mit Polyimid isolierten Draht, so kann das oberflächenmontierbare Bauele­ment mittels IR-Lötung, Dampfphaselötung oder auch Schwall­lötung auf die Schaltungsplatine aufgelötet werden, ohne daß eine Beschädigung der Kunststoffumhüllung des Ringkernes zu befürchten ist. Somit ist ein SMD-Bauelement gegeben, das für Mischbestückung und auch für doppelseitige SMD-Bestückung ge­eignet ist.If the winding ends are welded to the connection elements or soldered with a solder that preferably only melts at temperatures above 260 ° C., and use is made of a high-temperature-resistant winding wire, for. B. a wire insulated with polyimide, the surface-mountable component can be soldered onto the circuit board by means of IR soldering, vapor phase soldering or wave soldering, without causing damage to the plastic casing of the toroid fear. This provides an SMD component that is suitable for mixed assembly and also for double-sided SMD assembly.

Die Erfindung wird nachstehend anhand von Ausführungsbei­spielen erläutert. Es zeigt:

  • Figur 3 eine Draufsicht auf ein Ausführungsbeispiel eines Über­tragers nach der Erfindung, wobei nur eine Wicklung dargestellt ist
  • Figur 4 einen Schnitt gemäß der Linie 4,4 in Figur 3, betrachtet in Pfeilrichtung BB
  • Figur 5 ein zweites Ausführungsbeispiel des Gegenstandes nach Erfindung in der Darstellung nach Figur 4
The invention is explained below using exemplary embodiments. It shows:
  • Figure 3 is a plan view of an embodiment of a transformer according to the invention, only one winding is shown
  • Figure 4 shows a section along the line 4,4 in Figure 3, viewed in the direction of arrow BB
  • FIG. 5 shows a second exemplary embodiment of the object according to the invention in the illustration according to FIG. 4

Gemäß Figur 3, 4 ist ein z. B. stranggepreßter Ringkern 20 mit einer hochtemperaturfesten Kunststoffschicht 21 umspritzt. An die, betrachtet in Zeichnungsebene untere Stirnfläche der Kunststoffschicht 21 sind Augen 22, 24, 26, 28 angespritzt, in die Anschlußstifte 23, 25, 27, 29 eingebettet sind.According to Figure 3, 4 is a z. B. extruded ring core 20 with a high-temperature resistant plastic layer 21. Eyes 22, 24, 26, 28, into which connection pins 23, 25, 27, 29 are embedded, are injection molded onto the lower end face of the plastic layer 21, viewed in the plane of the drawing.

An die Kunststoffschicht 21 sind bevorzugt einstückige Trenn­wände 30 bis 33 angespritzt, durch welche die Umfangsfläche der Bauelemente jeweils in getrennte Kammern für die einzelnen Wicklungen - so z. B. für die Wicklung 40 - aufgeteilt wird.One-piece partitions 30 to 33 are preferably injection molded onto the plastic layer 21, through which the peripheral surface of the components is in each case in separate chambers for the individual windings - for. B. for the winding 40 - is divided.

Der so gestaltete Übertrager gewährleistet eine einwandfreie Wicklungsisolierung und schafft die Vorraussetzung für ein lagengerechtes und automatisiertes Wickeln und Anwickeln der Wicklungsenden 41 an die Anschlußstifte.The transformer designed in this way ensures perfect winding insulation and creates the prerequisites for a position-oriented and automated winding and winding of the winding ends 41 onto the connecting pins.

Die SMD-gerechte Übertrager-Ausführung nach Figur 5 zeigt einen Ferrit-Ringkern 50 mit umspritzter Kunststoffschicht 51 und an­gespritzten Trennwänden 56, 57 und 58. In den, betrachtet in Zeichnungsebene unteren Teil der Kunststoffschicht 51 sind L-för­mige Anschlußelemente, z. B. Anschlußfahnen 52 bis 54, einge­spritzt, die quer zur Längsmittelachse des Ringkerns 50 heraus­geführt und in ihren freien Enden so gekrümmt sind, daß eine SMD - geeignete Montage der Bauelemente möglich ist. Beachtet man zudem im Bereich der Anschlußelemente 52 bis 54 eine bestimmte Höhe der Trennwände 56 bis 58, so wird zusätzlich ein für die Bauelemente sowie die Wicklungen erforderlicher Mindest­abstand zur Oberfläche der Schaltungsplatine bei SMD-Montage ge­währleistet.The SMD-compliant transformer version according to FIG. 5 shows a ferrite ring core 50 with an encapsulated plastic layer 51 and molded partitions 56, 57 and 58. In the lower part of the plastic layer 51, as seen in the plane of the drawing, L-shaped connecting elements, e.g. B. terminal lugs 52 to 54, injected, which lead out transversely to the longitudinal central axis of the ring core 50 and are curved in their free ends so that a SMD - suitable assembly of the components is possible. If one also observes a certain height of the partition walls 56 to 58 in the area of the connection elements 52 to 54, then a minimum distance from the surface of the circuit board required for the components and the windings is also ensured in the case of SMD assembly.

Claims (5)

1. Induktives Bauelement, insbesondere Übertrager, Drossel­spule u. dgl., mit einem Ringkern aus ferromagnetischem Material, mindestens einer auf den Ringkern aufgebrachten Wicklung und Anschlußelementen zum Anschluß der Wickelenden, dadurch gekennzeichnet, daß der Ring­kern (20, 50) unmittelbar mit bevorzugt hochtemperaturfestem Kunststoff (21, 51) umspritzt ist und daß in dessen zu mindestens einer der Ringkernstirnflächen benachbarten Bereiche Anschluß­elemente (23, 25, 27, 29 bzw. 52, 53, 54) eingespritzt sind.1. Inductive component, especially transformer, choke coil u. Like., With a toroidal core made of ferromagnetic material, at least one winding applied to the toroidal core and connecting elements for connecting the winding ends, characterized in that the toroidal core (20, 50) is directly encapsulated with preferably high-temperature-resistant plastic (21, 51) and that in whose connecting elements (23, 25, 27, 29 or 52, 53, 54) are injected into at least one of the areas adjacent to the ring core end faces. 2. Bauelement nach Anspruch 1, dadurch gekenn­zeichnet, daß die Anschlußelemente Anschlußstifte (23, 25, 27, 29) sind.2. Component according to claim 1, characterized in that the connecting elements are connecting pins (23, 25, 27, 29). 3. Bauelement nach Anspruch 1, dadurch gekenn­zeichnet, daß die Anschlußelemente L-förmige, im Bereich der Ringkernstirnfläche quer zur Längsmittelachse des Ringkerns (50) herausgeführte Anschlußelemente (52, 53, 54) sind.3. Component according to claim 1, characterized in that the connecting elements are L-shaped, in the region of the ring core end face transversely to the longitudinal central axis of the ring core (50) leading out connecting elements (52, 53, 54). 4. Bauelement nach Anspruch 1, dadurch gekenn­zeichnet, daß an die Kunststoffschicht (21, 51) Trenn­wände (30 bis 33 bzw. 56 bis 58) für die einzelnen Wicklungen (40) angespritzt sind.4. The component according to claim 1, characterized in that on the plastic layer (21, 51) partitions (30 to 33 or 56 to 58) for the individual windings (40) are injection molded. 5. Bauelement nach Anspruch 1, 3 und 4 gekennzeich­net durch die Verwendung als SMD-Bauelement.5. The component according to claim 1, 3 and 4 characterized by the use as a SMD component.
EP89113372A 1988-07-21 1989-07-20 Inductive component, especially a transformer Withdrawn EP0351861A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824833 1988-07-21
DE3824833 1988-07-21

Publications (1)

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EP0351861A1 true EP0351861A1 (en) 1990-01-24

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EP89113372A Withdrawn EP0351861A1 (en) 1988-07-21 1989-07-20 Inductive component, especially a transformer

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EP (1) EP0351861A1 (en)
FI (1) FI893511A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5233318A (en) * 1991-03-29 1993-08-03 Kokusai Electric Co., Ltd. Cm type directional coupler
DE19633983C1 (en) * 1996-08-22 1997-08-28 Vacuumschmelze Gmbh Winding protection production for laminated cores
US6849295B2 (en) 1996-08-22 2005-02-01 Vacuumschmelze Gmbh Method for producing a winding protection for tape-wound cores

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307262A1 (en) * 1983-03-02 1984-09-06 Vogt Gmbh & Co Kg, 8391 Erlau Annular core suppression inductor with a directed scatter field
AT376518B (en) * 1977-05-14 1984-11-26 Vogt Gmbh & Co Kg RADIO INTERFERENCE THROTTLE FOR PHASE-CONTROLLED SEMICONDUCTOR SWITCHES
EP0175069A1 (en) * 1984-09-20 1986-03-26 Vacuumschmelze GmbH Process for making an inductive element with a wound toroidal core

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT376518B (en) * 1977-05-14 1984-11-26 Vogt Gmbh & Co Kg RADIO INTERFERENCE THROTTLE FOR PHASE-CONTROLLED SEMICONDUCTOR SWITCHES
DE3307262A1 (en) * 1983-03-02 1984-09-06 Vogt Gmbh & Co Kg, 8391 Erlau Annular core suppression inductor with a directed scatter field
EP0175069A1 (en) * 1984-09-20 1986-03-26 Vacuumschmelze GmbH Process for making an inductive element with a wound toroidal core

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5233318A (en) * 1991-03-29 1993-08-03 Kokusai Electric Co., Ltd. Cm type directional coupler
DE19633983C1 (en) * 1996-08-22 1997-08-28 Vacuumschmelze Gmbh Winding protection production for laminated cores
US6849295B2 (en) 1996-08-22 2005-02-01 Vacuumschmelze Gmbh Method for producing a winding protection for tape-wound cores

Also Published As

Publication number Publication date
FI893511A0 (en) 1989-07-20
FI893511A (en) 1990-01-22

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