EP0037970A2 - Line transformer for a television receiver - Google Patents

Line transformer for a television receiver Download PDF

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Publication number
EP0037970A2
EP0037970A2 EP81102482A EP81102482A EP0037970A2 EP 0037970 A2 EP0037970 A2 EP 0037970A2 EP 81102482 A EP81102482 A EP 81102482A EP 81102482 A EP81102482 A EP 81102482A EP 0037970 A2 EP0037970 A2 EP 0037970A2
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EP
European Patent Office
Prior art keywords
primary winding
winding
transformer
grooves
voltage
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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.)
Withdrawn
Application number
EP81102482A
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German (de)
French (fr)
Other versions
EP0037970A3 (en
Inventor
Walter Goseberg
Wolfgang Reichow
Alfred Pollak
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication of EP0037970A2 publication Critical patent/EP0037970A2/en
Publication of EP0037970A3 publication Critical patent/EP0037970A3/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Withdrawn legal-status Critical Current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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H01F38/42—Flyback transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications

Definitions

  • a line transformer for a television receiver contains u. a. the primary winding, a high-voltage winding and a high-voltage rectifier for generating the high voltage for the picture tube.
  • the primary winding is generally between the line end stage transistor and the operating voltage. This means that between the beginning and end of the primary winding lies the entire pulse voltage generated on the primary winding, ie a return voltage with an amplitude of approximately 1.2 kV. These high voltage difference requires special measures for insulation.
  • the invention has for its object to design the line transformer so that you can still do without this insulating film while maintaining the necessary dielectric strength.
  • the solution according to the invention essentially consists of two steps.
  • the first is the use of a multiple enamelled wire, which, however, alone could not achieve the desired dielectric strength without an insulating film.
  • the second step is to provide grooves on the surface of the coil body. This step is based on the following knowledge. If the primary winding is wound in a known manner on the smooth surface of a cylindrical bobbin, the potting compound cannot properly penetrate into the spaces between the individual turns of the primary winding during casting, so that there are easily air pockets or voids. However, these endanger the desired dielectric strength of the primary winding.
  • the grooves mentioned now form channels through which the casting compound can also penetrate into the winding from the inside of the primary winding, namely over its entire length and from both sides of the primary winding. This ensures that the gaps between the individual turns of the primary winding are properly filled by the sealing compound and the desired dielectric strength is achieved without an insulating film. Manufacturing costs and stability of the coil body, however, are not affected by the small grooves.
  • the line output stage transistor 2 controlled by the line-frequency switching voltage 1, the line transformer 3 with the primary winding 4 and the high-voltage winding 5, the two high-voltage rectifiers 6, 7, the smoothing capacitor 8 for the high voltage, the picture tube 9, the tangent capacitor 10, the line deflection coils 11 and the return condenser 12.
  • the mode of operation of the high-voltage rectifiers 6, 7 located at the two ends of the high-voltage winding 5 is described in more detail in the earlier patent application P 29 44 220.
  • the primary winding 4 is divided into two sub-windings 4a and 4b, one of which from the first to the second end and the other from the second end to the first end of the Is wound back. It is thereby achieved that the beginning and end of the primary winding 4 end in a desired manner at the same end of the coil former of the line transformer and can be led out of the sealing compound.
  • the winding 4 is switched according to FIG. 1, the operating voltage of, for example, + 150 V without AC voltage is at the beginning of the partial winding 4a.
  • the line return pulse 13 At the lower end of the partial winding 4b, however, is the line return pulse 13 with an amplitude of approximately 1.5 kV.
  • the insulating film 14 is therefore necessary in known transformers.
  • Figure 3 shows a section of the rotationally symmetrical arrangement of the encapsulated line transformer.
  • the primary winding 4 with its two layers 4a and 4b is wound directly onto the cylindrical bobbin 15, which has the central bore 20 for receiving the transformer core.
  • the coil body 15 is provided on its surface with axially extending grooves 16, through which the section shown in FIG. 3 is passed. These grooves 16 form channels through which the casting compound 17 can also penetrate into the winding 4 from the inside in the direction 18. All individual turns of the winding 4 are then properly surrounded by the potting compound 17. Without these channels, this perfect penetration of the sealing compound into the spaces between the wires of the winding 4 would not be guaranteed.
  • the potting compound 17 surrounds the coil former 15, the winding 4 and the coil former 19 for the high-voltage winding 5 designed as a chamber winding. This creates a closed casting body from which the connections for the primary winding 4 and the high-voltage winding 5 are led out.
  • the two high-voltage rectifiers 6, 7 can be cast into the potting compound 17, so that the potting body still has a connection for the rectified high voltage U2 on its upper side.
  • Figure 4 shows a cross section through the coil body 15, which is provided over its circumference with a total of six distributed grooves 16. These have a width of approximately 2 mm and a depth of approximately 0.25 mm. The shape of the winding 4 is practically not influenced by the narrow slots 16, since the tightly wound turns span the slots in a bridge-like manner. In the final state, the grooves 16 are also filled by the potting compound 17.
  • An epoxy resin is preferably used as casting compound 17, and a multi-copper enamelled wire of the Cu2L or Cu3L type is used for the wire of the windings 4.
  • the windings 4a and 4b are continuously wound with two wires lying next to one another, which are connected to one another at the input and output of the overall winding 4 and are therefore parallel.
  • Two wires lying in parallel have approximately the shape of a rectangular wire. This type of winding achieves a particularly good use of space on the coil former 15. This is important so that the distance between the high-voltage winding 5 and the primary winding 4 is as small as possible to achieve a fixed coupling.

Landscapes

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

Abstract

In a line transformer for a television receiver in which the start and end of the primary winding (4) end at the same end of the coil former (15), an insulating film is required between the two partial windings (4a, 4b) to achieve the necessary dielectric strength. Moreover, it is necessary to ensure that the cast mass (17) penetrates satisfactorily into the intermediate spaces of the turns of the primary winding (4). To save insulating film, and to improve the penetration of the cast mass (17), the coil former (15) is provided with axially running grooves (16) on its surface through which the cast mass (17) can flow. <IMAGE>

Description

Ein Zeilentransformator für einen Fernsehempfänger enthält u. a. die Primärwicklung, eine Hochspannungswicklung und einen Hochspannungsgleichrichter zur Erzeugung der Hochspannung für die Bildröhre.A line transformer for a television receiver contains u. a. the primary winding, a high-voltage winding and a high-voltage rectifier for generating the high voltage for the picture tube.

Zur Erzielung der notwendigen Spannungsfestigkeit ist es bekannt, alle diese Teile in eine Vergußmasse einzugießen. Dadurch entsteht ein kompaktes Bauteil mit mehreren Anschlußstiften, mit denen es in eine gedruckte Leiterplatte freitragend eingelötet werden kann.To achieve the necessary dielectric strength, it is known to pour all of these parts into a casting compound. This creates a compact component with several connection pins with which it can be soldered in a self-supporting manner in a printed circuit board.

U.a. aus diesem Grunde ist man bemüht, die Primärwicklung so auf einem Spulenkörper anzuordnen, daß Anfang und Ende der Wicklung am selben Ende des Spulenkörpers liegen. Andererseits liegt die Primärwicklung im allgemeinen zwischen dem Zeilenendstufentransistor und der Betriebsspannung. Das bedeutet, daß zwischen Anfang und Ende der Primärwicklung die gesamte an der Primärwicklung erzeugte Impulsspannung liegt, d.h. eine Rücklaufspannung mit einer Amplitude von ca. 1,2 kV. Diese hohe Spannungsdifferenz erfordert besondere Maßnahmen für die Isolation.For this reason, one tries to arrange the primary winding on a bobbin so that the beginning and end of the winding are at the same end of the bobbin. On the other hand, the primary winding is generally between the line end stage transistor and the operating voltage. This means that between the beginning and end of the primary winding lies the entire pulse voltage generated on the primary winding, ie a return voltage with an amplitude of approximately 1.2 kV. These high voltage difference requires special measures for insulation.

Um diese Spannungsfestigkeit an der Primärwicklung zu gewährleisten, ist es notwendig, zwischen den beiden übereinander liegenden Teilwicklungen eine Isolierfolie vorzusehen. Der Materialaufwand für eine solche Folie ist zwar gering. Das zusätzliche Einfügen der Isolierfolie beim Wickelvorgang erfordert jedoch einen zusätzlichen Arbeitsaufwand und kostet zusätzliche Herstellungszeit. Ganz besonders gravierend ist dieser Nachteil bei automatischen Wickelmaschinen. Diese werden beträchtlich teurer, wenn zwischen den beiden Teilwicklungen noch eine Isolierfolie aufgebracht werden muß. Versuche, ohne eine solche Isolierfolie auszukommen, waren bislang ohne Erfolg.In order to ensure this dielectric strength at the primary winding, it is necessary to provide an insulating film between the two partial windings lying one above the other. The cost of materials for such a film is low. However, the additional insertion of the insulating film during the winding process requires additional work and costs additional manufacturing time. This disadvantage is particularly serious with automatic winding machines. These become considerably more expensive if an insulating film still has to be applied between the two partial windings. Attempts to do without such an insulating film have so far been unsuccessful.

Der Erfindung liegt die Aufgabe zugrunde, den Zeilentrafo so auszubilden, daß man bei Einhaltung der notwendigen Spannungsfestigkeit trotzdem ohne diese Isolierfolie auskommt.The invention has for its object to design the line transformer so that you can still do without this insulating film while maintaining the necessary dielectric strength.

Diese Aufgabe wird durch die im Anspruch 1 beschriebene Erfindung gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.This object is achieved by the invention described in claim 1. Advantageous developments of the invention are described in the subclaims.

Die erfindungsgemäße Lösung besteht also im wesentlichen aus zwei Schritten. Der erste besteht in der Verwendung eines Mehrfach-Lackdrahtes, wodurch allein jedoch noch nicht die gewünschte Spannungsfestigkeit ohne Isolierfolie erreicht werden konnte. Der zweite Schritt besteht in der Maßnahme, an der Oberfläche des Spulenkörpers Nuten vorzusehen. Diesem Schritt liegt folgende Erkenntnis zugrunde. Wenn die Primärwicklung in bekannter Weise auf die glatte Oberfläche eines zylindrischen Spulenkörpers gewickelt wird, kann beim Vergießen die Vergußmasse nicht einwandfrei in die Zwischenräume zwischen den einzelnen Windungen der Primärwicklung eindringen, so daß dort leicht Lufteinschlüsse oder Lunker entstehen. Diese jedoch gefährden die gewünschte Spannungsfestigkeit der Primärwicklung. Die genannten Nuten hingegen bilden nunmehr Kanäle, durch die die Vergußmasse auch von der Innenseite der Primärwicklung in die Wicklung eindringen kann, und zwar über deren gesamte Länge und von beiden Seiten der Primärwicklung. Dadurch wird erreicht, daß die Zwischenräume zwischen den einzelnen Windungen der Primärwicklung einwandfrei von der Vergußmasse ausgefüllt werden und ohne Isolierfolie die angestrebte Spannungsfestigkeit erreicht wird. Herstellungskosten und Stabilität des Spulenkörpers werden hingegen durch die kleinen Nuten nicht beeinträchtigt.The solution according to the invention essentially consists of two steps. The first is the use of a multiple enamelled wire, which, however, alone could not achieve the desired dielectric strength without an insulating film. The second step is to provide grooves on the surface of the coil body. This step is based on the following knowledge. If the primary winding is wound in a known manner on the smooth surface of a cylindrical bobbin, the potting compound cannot properly penetrate into the spaces between the individual turns of the primary winding during casting, so that there are easily air pockets or voids. However, these endanger the desired dielectric strength of the primary winding. The grooves mentioned, on the other hand, now form channels through which the casting compound can also penetrate into the winding from the inside of the primary winding, namely over its entire length and from both sides of the primary winding. This ensures that the gaps between the individual turns of the primary winding are properly filled by the sealing compound and the desired dielectric strength is achieved without an insulating film. Manufacturing costs and stability of the coil body, however, are not affected by the small grooves.

Die Erfindung wird anhand der Zeichnung an einem Ausführungsbeispiel erläutert. Darin zeigen

  • Figur 1 das Schaltbild einer Zeilenendstufe mit einem Zeilentransformator,
  • Figur 2 den Aufbau der Primärwicklung mit der Isolierfolie,
  • Figur 3 ein Ausführungsbeispiel der Erfindung und
  • Figur 4 den Spulenkörper von Figur 3 in einem Querschnitt.
The invention is explained with reference to the drawing using an exemplary embodiment. Show in it
  • FIG. 1 shows the circuit diagram of a line output stage with a line transformer,
  • FIG. 2 shows the structure of the primary winding with the insulating film,
  • Figure 3 shows an embodiment of the invention and
  • Figure 4 shows the coil body of Figure 3 in a cross section.

Figur 1 zeigt den von der zeilenfrequenten Schaltspannung 1 gesteuerten Zeilenendstufentransistor 2, den Zeilentrafo 3 mit der Primärwicklung 4 und der Hochspannungswicklung 5, die beiden Hochspannungsgleichrichter 6,7, den Glättungskondensator 8 für die Hochspannung, die Bildröhre 9, den Tangenskondensator 10, die Zeilenablenkspulen 11 und den Rücklaufkondensator 12. Die Wirkungsweise der an den beiden Enden der Hochspannungswicklung 5 liegenden Hochspannungsgleichrichter 6,7 ist näher beschrieben in der älteren Patentanmeldung P 29 44 220.1 shows the line output stage transistor 2 controlled by the line-frequency switching voltage 1, the line transformer 3 with the primary winding 4 and the high-voltage winding 5, the two high-voltage rectifiers 6, 7, the smoothing capacitor 8 for the high voltage, the picture tube 9, the tangent capacitor 10, the line deflection coils 11 and the return condenser 12. The mode of operation of the high-voltage rectifiers 6, 7 located at the two ends of the high-voltage winding 5 is described in more detail in the earlier patent application P 29 44 220.

Gemäß Figur 2 ist die Primärwicklung 4 in zwei Teilwicklungen 4a und 4b aufgeteilt, von denen die eine vom ersten zum zweiten Ende und die andere vom zweiten Ende zum ersten Ende des Spulenkörpers zurückgewickelt ist. Dadurch wird erreicht, daß Anfang und Ende der Primärwicklung 4 in erwünschter Weise am selben Ende des Spulenkörpers des Zeilentrafos enden und aus der Vergußmasse herausgeführt werden können. Wenn die Wicklung 4 gemäß Figur 1 geschaltet ist, so steht am Anfang der Teilwicklung 4a die Betriebsspannung von z.B. + 150 V ohne Wechselspannung. Am unteren Ende der Teilwicklung 4b steht jedoch der Zeilenrücklaufimpuls 13 mit einer Amplitude von etwa 1,5 kV. Um die Spannungsfestigkeit an den unteren Enden der Teilwicklungen 4a und 4b zu gewährleisten, ist daher bei bekannten Trafos die Isolierfolie 14 notwendig.According to Figure 2, the primary winding 4 is divided into two sub-windings 4a and 4b, one of which from the first to the second end and the other from the second end to the first end of the Is wound back. It is thereby achieved that the beginning and end of the primary winding 4 end in a desired manner at the same end of the coil former of the line transformer and can be led out of the sealing compound. If the winding 4 is switched according to FIG. 1, the operating voltage of, for example, + 150 V without AC voltage is at the beginning of the partial winding 4a. At the lower end of the partial winding 4b, however, is the line return pulse 13 with an amplitude of approximately 1.5 kV. In order to ensure the dielectric strength at the lower ends of the partial windings 4a and 4b, the insulating film 14 is therefore necessary in known transformers.

Figur 3 zeigt einen Ausschnitt aus der rotationssymmetrischen Anordnung des vergossenen Zeilentrafos. Die Primärwicklung 4 mit ihren beiden Lagen 4a und 4b ist direkt auf den zylindrischen Spulenkörper 15 gewickelt, der die zentrale Bohrung 20 zur Aufnahme des Trafokerns aufweist. An seiner Oberfläche ist der Spulenkörper 15 mit axial verlaufenden Nuten 16 versehen, durch die der in Figur 3 dargestellte Schnitt hindurchgelegt ist. Diese Nuten 16 bilden Kanäle, durch die hindurch die Vergußmasse 17 in Richtung 18 auch von der Innenseite in die Wicklung 4 eindringen kann. Alle einzelnen Windungen der Wicklung 4 werden dann einwandfrei von der Vergußmasse 17 umgeben. Ohne diese Kanäle wäre dieses einwandfreie Eindringen der Vergußmasse in die Zwischenräume zwischen den Drähten der Wicklung 4 nicht gewährleistet. Die Vergußmasse 17 umgibt den Spulenkörper 15, die Wicklung 4 und den Spulenkörper 19 für die als Kammerwicklung ausgebildete Hochspannungswicklung 5. Dadurch entsteht ein geschlossener Vergußkörper, aus dem die Anschlüsse für die Primärwicklung 4 und die Hochspannungswicklung 5 herausgeführt sind. In die Vergußmasse 17 können zusätzlich noch die beiden Hochspannungsgleichrichter 6,7 eingegossen sein, so daß der Vergußkörper an seiner Oberseite noch einen Anschluß für die gleichgerichtete Hochspannung U2 aufweist.Figure 3 shows a section of the rotationally symmetrical arrangement of the encapsulated line transformer. The primary winding 4 with its two layers 4a and 4b is wound directly onto the cylindrical bobbin 15, which has the central bore 20 for receiving the transformer core. The coil body 15 is provided on its surface with axially extending grooves 16, through which the section shown in FIG. 3 is passed. These grooves 16 form channels through which the casting compound 17 can also penetrate into the winding 4 from the inside in the direction 18. All individual turns of the winding 4 are then properly surrounded by the potting compound 17. Without these channels, this perfect penetration of the sealing compound into the spaces between the wires of the winding 4 would not be guaranteed. The potting compound 17 surrounds the coil former 15, the winding 4 and the coil former 19 for the high-voltage winding 5 designed as a chamber winding. This creates a closed casting body from which the connections for the primary winding 4 and the high-voltage winding 5 are led out. In addition, the two high-voltage rectifiers 6, 7 can be cast into the potting compound 17, so that the potting body still has a connection for the rectified high voltage U2 on its upper side.

Figur 4 zeigt einen Querschnitt durch den Spulenkörper 15, der über seinen Umfang mit insgesamt sechs verteilten Nuten 16 versehen ist. Diese haben eine Breite von etwa 2 mm und eine Tiefe von etwa 0,25 mm. Die Form der Wicklung 4 wird durch die schmalen Nuten 16 praktisch nicht beeinflußt, da die stramm gewickelten Windungen die Nuten brückenartig überspannen. Im Endzustand sind auch die Nuten 16 durch die Vergußmasse 17 ausgefüllt.Figure 4 shows a cross section through the coil body 15, which is provided over its circumference with a total of six distributed grooves 16. These have a width of approximately 2 mm and a depth of approximately 0.25 mm. The shape of the winding 4 is practically not influenced by the narrow slots 16, since the tightly wound turns span the slots in a bridge-like manner. In the final state, the grooves 16 are also filled by the potting compound 17.

Als Vergußmasse 17 wird vorzugsweise ein Epoxidharz verwendet, für den Draht der Wicklungen 4 ein Mehrfach-Kupfer-Lackdraht vom Typ Cu2L oder Cu3L.An epoxy resin is preferably used as casting compound 17, and a multi-copper enamelled wire of the Cu2L or Cu3L type is used for the wire of the windings 4.

Die Wicklungen 4a und 4b sind durchgehend mit zwei nebeneinander liegenden Drähten gewickelt, die am Eingang und Ausgang der Gesamtwicklung 4 miteinander verbunden sind und somit parallel liegen. Zwei derart parallel liegende Drähte haben annähernd die Form eines rechteckförmigen Drahtes. Durch diese Art der Wicklung wird eine besonders gute Raumausnutzung auf dem Spulenkörper 15 erreicht. Dieses ist wichtig, damit der Abstand der Hochspannungswicklung 5 von der Primärwicklung 4 zur Erzielung eine festen Kopplung möglichst gering ist.The windings 4a and 4b are continuously wound with two wires lying next to one another, which are connected to one another at the input and output of the overall winding 4 and are therefore parallel. Two wires lying in parallel have approximately the shape of a rectangular wire. This type of winding achieves a particularly good use of space on the coil former 15. This is important so that the distance between the high-voltage winding 5 and the primary winding 4 is as small as possible to achieve a fixed coupling.

Claims (5)

1. Zeilentransformator für einen Fernsehempfänger mit einer auf einen Spulenkörper gewickelten Primärwicklung, bei dem der Spulenkörper, die Primärwicklung und weitere Trafoteile in eine Vergußmasse eingegossen sind, gekennzeichnet durch folgende Merkmale: a) die Primärwicklung (4) besteht aus zwei unmittelbar aufeinander gewickelten Lagen, derart, daß der Anfang und das Ende der Primärwicklung (4) an demselben Ende des Spulenkörpers (15) liegen. b) für die Primärwicklung (4) ist ein Draht mit einer mehrfachen Lackschicht verwendet. c) der Spulenkörper (5) ist an seiner Oberfläche mit axial verlaufenden Nuten (16) versehen, die zum Ende des Spulenkörpers hin offen sind. d) die Primärwicklung (4) ist in beiden Lagen mit zwei unmittelbar nebeneinander liegenden, parallel geschalteten Drähten gewickelt. 1. Line transformer for a television receiver with a primary winding wound on a coil former, in which the coil former, the primary winding and further transformer parts are cast in a casting compound, characterized by the following features: a) the primary winding (4) consists of two directly wound layers, such that the beginning and end of the primary winding (4) are at the same end of the bobbin (15). b) a wire with a multiple layer of lacquer is used for the primary winding (4). c) the coil body (5) is provided on its surface with axially extending grooves (16) which are open towards the end of the coil body. d) the primary winding (4) is wound in both layers with two directly adjacent, parallel wires. 2. Trafo nach Anspruch 1, dadurch gekennzeichnet, daß der Draht ein Dreifach-Lackdraht ist.2. Transformer according to claim 1, characterized in that the wire is a triple enamelled wire. 3. Trafo nach Anspruch 1, dadurch gekennzeichnet, daß etwa sechs über den Umfang des Spulenkörpers (15) verteilte Nuten (16) vergesehen sind.3. Transformer according to claim 1, characterized in that about six over the circumference of the coil body (15) distributed grooves (16) are provided. 4. Trafo nach Anspruch 1, dadurch gekennzeichnet, daß die Breite der Nuetn (16) in der Größenordnung von 2 mm liegt.4. Transformer according to claim 1, characterized in that the width of the nuetn (16) is of the order of 2 mm. 5. Trafo nach Anspruch 1, dadurch gekennzeichnet, daß die Tiefe der Nuten (16) in der Größenordnung von 0,25 mm liegt.5. Transformer according to claim 1, characterized in that the depth of the grooves (16) is of the order of 0.25 mm.
EP81102482A 1980-04-10 1981-04-02 Line transformer for a television receiver Withdrawn EP0037970A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803013725 DE3013725A1 (en) 1980-04-10 1980-04-10 LINE TRANSFORMER FOR A TELEVISION RECEIVER
DE3013725 1980-04-10

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EP0037970A2 true EP0037970A2 (en) 1981-10-21
EP0037970A3 EP0037970A3 (en) 1981-12-02

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JP (1) JPS56153712A (en)
DE (1) DE3013725A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0777240A1 (en) * 1995-12-01 1997-06-04 Deutsche Thomson-Brandt Gmbh High voltage line transfomer for a TV receiver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733458A1 (en) * 1987-09-30 1989-04-13 Electronic Werke Deutschland Line transformer for a television receiver (television set)

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Cited By (1)

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EP0777240A1 (en) * 1995-12-01 1997-06-04 Deutsche Thomson-Brandt Gmbh High voltage line transfomer for a TV receiver

Also Published As

Publication number Publication date
JPS56153712A (en) 1981-11-27
EP0037970A3 (en) 1981-12-02
DE3013725A1 (en) 1981-10-15

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