EP0602528A1 - Transformer - Google Patents

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Publication number
EP0602528A1
EP0602528A1 EP93119794A EP93119794A EP0602528A1 EP 0602528 A1 EP0602528 A1 EP 0602528A1 EP 93119794 A EP93119794 A EP 93119794A EP 93119794 A EP93119794 A EP 93119794A EP 0602528 A1 EP0602528 A1 EP 0602528A1
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EP
European Patent Office
Prior art keywords
transformer
core
partial windings
windings
turns
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Withdrawn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
EP93119794A
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German (de)
French (fr)
Inventor
Andreas Huber
Franz Bernitz
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0602528A1 publication Critical patent/EP0602528A1/en
Withdrawn legal-status Critical Current

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    • 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
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core

Definitions

  • the invention relates to a transformer for forward and choke converters, in particular for supplying discharge lamps and low-voltage halogen lamps, according to the preamble of claim 1.
  • Transformers in various designs are known from the prior art.
  • at least one primary winding and one secondary winding wind around a core which is made of magnetizable material and has a ring shape, rod shape or other possible shapes.
  • the primary and secondary windings are usually layered on top of each other.
  • DE-OS 40 01 840 A1 proposes a transformer which has a primary winding and at least two secondary windings, and a transformer core with a central leg carrying the primary windings and two side legs.
  • the secondary windings are on the side legs and the middle leg.
  • the primary and secondary windings are stacked on top of each other on the middle leg.
  • Field distortions for example caused by an air gap in the transformer core or inhomogeneities in the core material, can produce a large difference in the magnetic flux in the partial windings due to the stacking of the primary and secondary windings, since the field distortions result in different magnetic fields at different distances from the core. As a result, the coupling between the partial windings is reduced, which in turn leads to poorer efficiency. This has a very negative effect, especially when using such transformers in forward and choke converters.
  • the invention has for its object to provide a transformer of the type mentioned, which has an improved coupling between the windings of the transformer.
  • the core carrying the winding is designed as a closed ring core.
  • a metal powder core offers the advantage of a highly controllable transformer.
  • a ferrite core offers good high-frequency properties of the transformer.
  • the arrangement of an air gap reduces the initial permeability ⁇ i to the effective permeability ⁇ e .
  • the component has a high strength and is easier to handle, which has a particularly favorable effect on soldering onto a circuit board .
  • the transformer can be used as an energy store and transformer in forward converters, e.g. Push-pull flow converter as well as in throttle converters, e.g. Use electrically isolated fly-back converters or tapped high actuators.
  • forward converters e.g. Push-pull flow converter
  • throttle converters e.g. Use electrically isolated fly-back converters or tapped high actuators.
  • Figure 1 shows a transformer 10 in which the core 12 is designed as a ring core.
  • a primary winding 14 and a secondary winding 16 are wound around the core 12, the secondary winding 16 having twice as many turns as the primary winding 14.
  • the winding is carried out in one layer, so that two secondary winding wires lie directly and immediately adjacent to the primary winding wire. Due to this close localization of the winding wires, corresponding primary or secondary winding segments are always exposed to almost exactly the same magnetic flux.
  • the winding wires experience almost exactly the same changed magnetic flux.
  • Such disturbances are caused, for example, by the sawn-in air gap in the ferrite core or by inhomogeneities in the core material itself. Because the partial windings are always surrounded by the same magnetic flux at corresponding points, even if this flux varies somewhat locally, there is a high coupling between primary winding 14 and secondary winding 16. This results in an improved efficiency of the transformer.
  • FIG. 2 shows a transformer 10 with a toroidal core 12 on which partial windings 18 are arranged.
  • the wound toroidal core 12 is fastened to a base plate 20 by means of adhesive 32.
  • the base plate 20 is provided with solder pins 22.
  • Corresponding winding ends 24 of the partial windings 18 are provided with corresponding solder pins 22. This resulting component can be e.g. insert into a circuit board using the soldering pins 22 and then solder firmly onto the circuit board.
  • FIGS. 3 and 4 show in circuit diagram form the use of the transformer once in a floating fly-back converter 26 (FIG. 3) and in a tapped up positioner 28 (FIG. 4).
  • the circuits in FIGS. 3 and 4 are used to supply discharge lamps and low-voltage halogen lamps.
  • the memory inductors 30 are constructed from a plurality of windings, as set out in the embodiment according to FIGS. 1 and 2.
  • the degree of freedom resulting from the multi-winding structure can be used in these application examples for a more favorable adaptation of the power components, e.g. via only one tap as winding transformer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

A transformer (10) for forward converters and constant-current transformers, in particular for feeding discharge lamps and low-voltage halogen lamps, has part windings (14, 16) which are wound jointly around a toroidal (annular) core (12). The toroidal core (12) is essentially occupied by one layer of turns of the part windings (14, 16), and the ratio of the number of turns per unit length of the individual part windings (14, 16) with respect to one another is approximately equal or approximately forms an integral multiple. <IMAGE>

Description

Die Erfindung betrifft einen Transformator für Durchfluß- und Drosselwandler, insbesondere zur Speisung von Entladungslampen und Niedervolt-Halogenlampen, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a transformer for forward and choke converters, in particular for supplying discharge lamps and low-voltage halogen lamps, according to the preamble of claim 1.

Transformatoren sind in den unterschiedlichsten Ausführungsformen aus dem Stand der Technik bekannt. Im allgemeinen winden sich mindestens eine Primärwicklung und eine Sekundärwicklung um einen Kern, der aus magnetisierbarem Material besteht und Ringform, Stabform oder auch andere mögliche Formen besitzt. Die Primär- und Sekundärwicklungen sind dabei meist übereinander geschichtet.Transformers in various designs are known from the prior art. In general, at least one primary winding and one secondary winding wind around a core which is made of magnetizable material and has a ring shape, rod shape or other possible shapes. The primary and secondary windings are usually layered on top of each other.

Je nach Art und Bauform der Transformatoren haben sie einen unterschiedlichen Wirkungsgrad, der in erster Linie von der Güte der Kopplung zwischen den Wicklungen bestimmt wird. In der DE-OS 40 01 840 A1 wird ein Transformator vorgeschlagen, der eine Primärwicklung und wenigstens zwei Sekundärwicklungen aufweist, sowie einen Trafokern mit einem, die Primärwicklungen tragenden Mittelschenkel und zwei Seitenschenkeln. Die Sekundärwicklungen sind auf den Seitenschenkeln und dem Mittelschenkel angeordnet. Auf dem Mittelschenkel sind Primär- und Sekundärwicklung aufeinander geschichtet. Feldverzerrungen, die beispielsweise durch einen Luftspalt im Trafokern oder Inhomogenitäten im Kernmaterial hervorgerufen werden, können durch die Aufeinanderschichtung der Primär- und Sekundärwicklung einen großen Unterschied im magnetischen Fluß in den Teilwicklungen erzeugen, da die Feldverzerrungen in unterschiedlichem Abstand vom Kern unterschiedliche magnetische Felder ergeben. Im Resultat ist die Kopplung zwischen den Teilwicklungen verringert, was wiederum einen schlechteren Wirkungsgrad bedingt. Dies wirkt sich insbesondere bei Verwendung solcher Transformatoren in Durchfluß- und Drosselwandlern sehr negativ aus.Depending on the type and design of the transformers, they have a different efficiency, which is primarily determined by the quality of the coupling between the windings. DE-OS 40 01 840 A1 proposes a transformer which has a primary winding and at least two secondary windings, and a transformer core with a central leg carrying the primary windings and two side legs. The secondary windings are on the side legs and the middle leg. The primary and secondary windings are stacked on top of each other on the middle leg. Field distortions, for example caused by an air gap in the transformer core or inhomogeneities in the core material, can produce a large difference in the magnetic flux in the partial windings due to the stacking of the primary and secondary windings, since the field distortions result in different magnetic fields at different distances from the core. As a result, the coupling between the partial windings is reduced, which in turn leads to poorer efficiency. This has a very negative effect, especially when using such transformers in forward and choke converters.

Der Erfindung liegt die Aufgabe zugrunde, einen Transformator der eingangs genannten Art zur Verfügung zu stellen, der eine verbesserte Kopplung zwischen den Wicklungen des Transformators aufweist.The invention has for its object to provide a transformer of the type mentioned, which has an improved coupling between the windings of the transformer.

Diese Aufgabe wird bei einem Transformator der eingangs genannten Art erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention in a transformer of the type mentioned at the outset by the characterizing features of claim 1.

Durch die einlagige Wicklung mit schraubenförmiger Verschachtelung und die in etwa gleichen oder ganzzahlig vielfachen Windungszahlen bei den Teilwicklungen, ist es möglich, daß Feldverzerrungen und Inhomogenitäten im während des Betriebs die Wicklungen umgebenden Magnetfeld keinen großen Unterschied im magnetischen Fluß in den einzelnen Teilwicklungen erzeugen. Die daraus resultierende gute Kopplung zwischen den Wicklungen verbessert den Wirkungsgrad des Transformators. In etwa bedeutet dabei, daß vorteilhaft die Abweichungen bei der Gleichheit oder dem ganzzahligen Vielfachen der Windungszahlen der Teilwicklungen höchstens 10 % betragen, da dann keine merkliche Störung bei der Kopplung der Teilwicklungen auftritt.Due to the single-layer winding with helical interleaving and the approximately equal or integral number of turns in the partial windings, it is possible that field distortions and inhomogeneities in the magnetic field surrounding the windings during operation do not produce a great difference in the magnetic flux in the individual partial windings. The resulting one good coupling between the windings improves the efficiency of the transformer. In this case, approximately means that the deviations in the equality or the integral multiple of the number of turns of the partial windings are advantageously at most 10%, since then there is no noticeable disturbance in the coupling of the partial windings.

Besonders vorteilhaft für eine homogene Feldverteilung ist es, wenn der die Wicklung tragende Kern als geschlossener Ringkern ausgebildet ist.It is particularly advantageous for a homogeneous field distribution if the core carrying the winding is designed as a closed ring core.

Ein Metallpulverkern bietet den Vorteil eines hoch aussteuerbaren Transformators. Ein Ferritkern bietet gute Hochfrequenzeigenschaften des Transformators.A metal powder core offers the advantage of a highly controllable transformer. A ferrite core offers good high-frequency properties of the transformer.

Durch die Anordnung eines Luftspalts wird die Anfangspermeabilität µi auf die effektive Permeabilität µe reduziert. Die Permeabilität eines Stoffes ist der Faktor, um den die magnetische Induktion durch Einbringen des Stoffes in das Feld vergrößert wird. Dieser Faktor ist im allgemeinen eine Funktion der magnetischen Feldstärke H und hat bei H = 0 den Wert µi. Diese Anfangspermeabilität µi kann von der Vorgeschichte des Stoffes, d.h. welche magnetischen Feldstärken H wie lange und wie oft auf den Stoff einwirken, abhängen.The arrangement of an air gap reduces the initial permeability µ i to the effective permeability µ e . The permeability of a substance is the factor by which the magnetic induction is increased by introducing the substance into the field. This factor is generally a function of the magnetic field strength H and has the value µ i at H = 0. This initial permeability μ i can depend on the previous history of the substance, ie which magnetic field strengths H act for how long and how often.

Ist der Ringkern mit den aufgebrachten Wicklungen mit einer Bodenplatte verklebt und mit an der Bodenplatte angeordneten Lötstiften versehen, die mit entsprechenden Wicklungsenden der Teilwicklungen verbunden sind, so hat das Bauteil eine hohe Festigkeit und ist leichter handhabbar, was insbesondere das Einlöten auf eine Platine günstig beeinflußt.If the toroid with the applied windings is glued to a base plate and provided with solder pins arranged on the base plate, which are connected to corresponding winding ends of the partial windings, the component has a high strength and is easier to handle, which has a particularly favorable effect on soldering onto a circuit board .

Bei entsprechendem Anordnen und Abgreifen der Teilwicklungen läßt sich der Transformator als Energiespeicher und Übertrager in Durchflußwandlern, wie z.B. Gegentakt-Durchflußwandler sowie in Drosselwandlern, wie z.B. potentialgetrennte Fly-Back-Wandler oder angezapfte Hochsteller verwenden.With appropriate arrangement and tapping of the partial windings, the transformer can be used as an energy store and transformer in forward converters, e.g. Push-pull flow converter as well as in throttle converters, e.g. Use electrically isolated fly-back converters or tapped high actuators.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der folgenden Beschreibung einer Ausführungsform und mehreren Anwendungsbeispielen sowie aus den Zeichnungen, auf die Bezug genommen wird. Darin zeigt

Figur 1
einen Transformator mit Ringkern und Wicklungen
Figur 2
einen Transformator gemäß Fig. 1, der mit einer Bodenplatte verklebt ist
Figur 3
ein Schaltbild eines potentialgetrennten Fly-Back-Wandlers mit einem Transformator gemäß Figur 1 und
Figur 4
ein Schaltbild eines angezapften Hochstellers mit einem Transformator gemäß Figur 1.
Further advantages and features of the invention result from the following description of an embodiment and several application examples and from the drawings to which reference is made. In it shows
Figure 1
a transformer with toroidal core and windings
Figure 2
a transformer as shown in FIG. 1, which is glued to a base plate
Figure 3
a circuit diagram of a floating fly-back converter with a transformer according to Figure 1 and
Figure 4
2 shows a circuit diagram of a tapped step-up actuator with a transformer according to FIG. 1.

Im folgenden werden für übereinstimmende Elemente die gleichen Bezugszeichen verwendet.The same reference numerals are used below for matching elements.

Figur 1 zeigt einen Transformator 10, bei dem der Kern 12 als Ringkern ausgeführt ist. Um den Kern 12 ist eine Primärwicklung 14 und eine Sekundärwicklung 16 gewunden, wobei die Sekundärwicklung 16 doppelt so viele Windungen aufweist, wie die Primärwicklung 14. Die Wicklung ist einlagig ausgeführt, so daß neben dem Primärwicklungsdraht direkt und unmittelbar angrenzend zwei Sekundärwicklungsdrähte liegen. Durch diese nahe Lokalisation der Wicklungsdrähte sind entsprechende Primär- bzw. Sekundärwindungssegmente immer nahezu exakt dem gleichen magnetischen Fluß ausgesetzt. Somit erfahren die Wicklungsdrähte bei einer Störung der homogenen Feldverteilung nahezu exakt denselben geänderten magnetischen Fluß. Solche Störungen werden beispielsweise durch den eingesägten Luftspalt im Ferritkern oder durch Inhomogenitäten im Kernmaterial selbst hervorgerufen. Dadurch, daß die Teilwicklungen an entsprechenden Stellen immer vom gleichen magnetischen Fluß, auch wenn dieser Fluß lokal etwas variiert, umgeben sind, ist eine hohe Kopplung zwischen Primärwicklung 14 und Sekundärwicklung 16 gegeben. Dies resultiert in einem verbesserten Wirkungsgrad des Transformators.Figure 1 shows a transformer 10 in which the core 12 is designed as a ring core. A primary winding 14 and a secondary winding 16 are wound around the core 12, the secondary winding 16 having twice as many turns as the primary winding 14. The winding is carried out in one layer, so that two secondary winding wires lie directly and immediately adjacent to the primary winding wire. Due to this close localization of the winding wires, corresponding primary or secondary winding segments are always exposed to almost exactly the same magnetic flux. Thus, in the event of a disturbance in the homogeneous field distribution, the winding wires experience almost exactly the same changed magnetic flux. Such disturbances are caused, for example, by the sawn-in air gap in the ferrite core or by inhomogeneities in the core material itself. Because the partial windings are always surrounded by the same magnetic flux at corresponding points, even if this flux varies somewhat locally, there is a high coupling between primary winding 14 and secondary winding 16. This results in an improved efficiency of the transformer.

In Figur 2 ist ein Transformator 10 mit einem Ringkern 12 dargestellt, auf dem Teilwicklungen 18 angeordnet sind. Der umwickelte Ringkern 12 ist mit einer Bodenplatte 20 mittels Klebstoff 32 befestigt. Die Bodenplatte 20 ist mit Lötstiften 22 versehen. Entsprechende Wicklungsenden 24 der Teilwicklungen 18 sind mit entsprechenden Lötstiften 22 versehen. Dieses so entstandene Bauteil läßt sich z.B. mittels der Lötstifte 22 in eine Platine einsetzen und auf der Platine dann fest verlöten.FIG. 2 shows a transformer 10 with a toroidal core 12 on which partial windings 18 are arranged. The wound toroidal core 12 is fastened to a base plate 20 by means of adhesive 32. The base plate 20 is provided with solder pins 22. Corresponding winding ends 24 of the partial windings 18 are provided with corresponding solder pins 22. This resulting component can be e.g. insert into a circuit board using the soldering pins 22 and then solder firmly onto the circuit board.

Figuren 3 und 4 zeigen in Schaltbildform die Verwendung des Transformators einmal in einem potentialgetrennten Fly-Back-Wandler 26 (Fig. 3) und in einem angezapften Hochsteller 28 (Fig. 4).FIGS. 3 and 4 show in circuit diagram form the use of the transformer once in a floating fly-back converter 26 (FIG. 3) and in a tapped up positioner 28 (FIG. 4).

Diese beiden verschiedenen Anwendungen lassen sich aus ein und demselben Bauteil, wie es in Figur 1 und 2 dargestellt ist, dadurch realisieren, daß die Wicklungsenden 24 entsprechend angezapft werden.These two different applications can be realized from one and the same component, as shown in FIGS. 1 and 2, in that the winding ends 24 are tapped accordingly.

Die Schaltungen in den Figuren 3 und 4 dienen zur Speisung von Entladungslampen und Niedervolt-Halogenlampen. Die Speicherinduktivitäten 30 sind aus mehreren Wicklungen aufgebaut, wie sie die Ausführungsform gemäß Figur 1 und 2 darlegt. Der sich durch den Mehrwicklungsaufbau ergebende Freiheitsgrad läßt sich bei diesen Anwendungsbeispielen für eine günstigere Anpassung der Leistungsbauelemente benutzen, z.B. über nur eine Wicklungsanzapfung als Spartrafo.The circuits in FIGS. 3 and 4 are used to supply discharge lamps and low-voltage halogen lamps. The memory inductors 30 are constructed from a plurality of windings, as set out in the embodiment according to FIGS. 1 and 2. The degree of freedom resulting from the multi-winding structure can be used in these application examples for a more favorable adaptation of the power components, e.g. via only one tap as winding transformer.

Claims (9)

Transformator (10) für Durchfluß- und Drosselwandler, insbesondere zur Speisung von Entladungslampen und Niedervolt-Halogenlampen, mit Teilwicklungen (14,16,18), die sich gemeinsam um einen Kern (12) winden, dadurch gekennzeichnet, daß der Kern (12) im wesentlichen einlagig mit Windungen der Teilwicklungen (14,16,18) belegt ist, wobei die einzelnen Teilwicklungen (14,16,18) schraubenförmig verschachtelt sind, und das Verhältnis der Windungszahlen der einzelnen Teilwicklungen (14, 16,18) zueinander in etwa gleich ist oder in etwa ein ganzzahliges Vielfaches bildet.Transformer (10) for forward and choke converters, in particular for supplying discharge lamps and low-voltage halogen lamps, with partial windings (14, 16, 18) which wind together around a core (12), characterized in that the core (12) essentially one layer is covered with turns of the partial windings (14, 16, 18), the individual partial windings (14, 16, 18) being nested helically, and the ratio of the number of turns of the individual partial windings (14, 16, 18) to one another is approximately is the same or approximately forms an integral multiple. Transformator (10) nach Anspruch 1, dadurch gekennzeichnet, daß die Abweichung der Windungszahlen der Teilwicklungen (14,16,18) von der Gleichheit oder dem ganzzahligen Vielfachen nicht mehr als 10 % beträgt.Transformer (10) according to claim 1, characterized in that the deviation of the number of turns of the partial windings (14, 16, 18) from the equality or the integral multiple is not more than 10%. Transformator (10) nach Anspruch 1, dadurch gekennzeichnet, daß der Kern als Ringkern (12) ausgeführt ist.Transformer (10) according to claim 1, characterized in that the core is designed as a toroidal core (12). Transformator (10) nach Anspruch 3, dadurch gekennzeichnet, daß der Kern (12) aus Metallpulver besteht.Transformer (10) according to claim 3, characterized in that the core (12) consists of metal powder. Transformator (10) nach Anspruch 3, dadurch gekennzeichnet, daß der Kern (12) aus Ferrit besteht.Transformer (10) according to claim 3, characterized in that the core (12) consists of ferrite. Transformator (10) nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Kern (12) einen Luftspalt aufweist.Transformer (10) according to claim 4 or 5, characterized in that the core (12) has an air gap. Transformator (10) nach mindestens einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß der Ringkern (12) mit den aufgebrachten Teilwicklungen (14,16,18) mit einer Bodenplatte (20) verklebt ist und die Bodenplatte (20) Lötstifte (22) aufweist, die mit entsprechenden Wicklungsenden (24) der Teilwicklungen (14,16,18) verbunden sind.Transformer (10) according to at least one of Claims 2 to 6, characterized in that the toroidal core (12) with the applied partial windings (14, 16, 18) is glued to a base plate (20) and the base plate (20) has solder pins (22 ) which are connected to corresponding winding ends (24) of the partial windings (14, 16, 18). Transformator (10) nach mindestens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Teilwicklungen (14,16) derart angeordnet und abgegriffen sind, daß der Transformator (10) als Energiespeicher und Übertrager in einem potentialgetrennten Fly-Back-Wandler (26) verwendet werden kann.Transformer (10) according to at least one of Claims 1 to 7, characterized in that the partial windings (14, 16) are arranged and tapped in such a way that the transformer (10) acts as an energy store and transmitter in a floating fly-back converter (26 ) can be used. Transformator (10) nach mindestens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Teilwicklungen (14,16) derart angeordnet und abgegriffen sind, daß der Transformator (10) als Energiespeicher und Übertrager in einem angezapften Hochsteller (28) verwendet werden kann.Transformer (10) according to at least one of Claims 1 to 7, characterized in that the partial windings (14, 16) are arranged and tapped in such a way that the transformer (10) can be used as an energy store and transmitter in a tapped up positioner (28) .
EP93119794A 1992-12-15 1993-12-08 Transformer Withdrawn EP0602528A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4242295 1992-12-15
DE19924242295 DE4242295A1 (en) 1992-12-15 1992-12-15 transformer

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EP0602528A1 true EP0602528A1 (en) 1994-06-22

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19960881A1 (en) * 1999-12-17 2001-06-21 Abb Research Ltd Low-cost transformer design, uses cylindrical core partly enclosed by coils forming the low-voltage (LV) and high-voltage (HV) circuits
DE102006013692A1 (en) * 2006-03-24 2007-10-04 Handlbauer, Gerhard Dimmer for controlling light source active at low voltage, has housing, free from manually operated switching or adjusting equipment, comprising infrared signal receiver influenced by signals of remote control transmitter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB918978A (en) * 1958-09-23 1963-02-20 Racal Electronics Ltd Improvements in electrical transformers
DE8809164U1 (en) * 1988-07-13 1989-05-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Low-leakage inductance medium-frequency transformer
WO1992004723A1 (en) * 1990-09-07 1992-03-19 Electrotech Instruments Limited Power transformers and coupled inductors with optimum interleaving of windings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB918978A (en) * 1958-09-23 1963-02-20 Racal Electronics Ltd Improvements in electrical transformers
DE8809164U1 (en) * 1988-07-13 1989-05-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Low-leakage inductance medium-frequency transformer
WO1992004723A1 (en) * 1990-09-07 1992-03-19 Electrotech Instruments Limited Power transformers and coupled inductors with optimum interleaving of windings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NASA TECH BRIEFS: "coaxial cable on toroid yields wide-band transformer", ELECTRONIC DESIGN, vol. 15, no. 13, 21 June 1967 (1967-06-21), pages 108 *

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