EP0033450B1 - Line output transformer for television receiver - Google Patents

Line output transformer for television receiver Download PDF

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Publication number
EP0033450B1
EP0033450B1 EP81100252A EP81100252A EP0033450B1 EP 0033450 B1 EP0033450 B1 EP 0033450B1 EP 81100252 A EP81100252 A EP 81100252A EP 81100252 A EP81100252 A EP 81100252A EP 0033450 B1 EP0033450 B1 EP 0033450B1
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EP
European Patent Office
Prior art keywords
winding
line transformer
transformer according
rectifier
high 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.)
Expired
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EP81100252A
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German (de)
French (fr)
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EP0033450A1 (en
Inventor
Walter Dipl.-Ing. Goseberg
Alfred Pollak
Wolfgang Dipl.-Ing. Reichow
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Cessione telefunken Fernseh und Rundfunk GmbH
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Licentia Patent Verwaltungs GmbH
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Priority to AT81100252T priority Critical patent/ATE5355T1/en
Publication of EP0033450A1 publication Critical patent/EP0033450A1/en
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Publication of EP0033450B1 publication Critical patent/EP0033450B1/en
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    • 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

  • the line transformer of a television receiver produces, as is known, by means of a high-voltage winding and a high-voltage rectifier and the like. a. the high voltage for the picture tube in the order of 25 KV. This voltage is obtained by rectifying the pulse-shaped return voltage. Because of this high pulse-shaped voltage, particularly high demands are placed on the dielectric strength of the line transformer, since such high pulse voltages can easily lead to flashovers and spray phenomena.
  • the line transformer generally contains a frame-shaped core with an air gap, with the principle of the single-leg transformer, the primary winding and the high-voltage winding being arranged one above the other on the same leg of the core.
  • the high voltage winding takes up practically the entire length of one leg of the core, i. H. as far as the other legs extending at right angles from this leg. It is precisely at these points, where the end of the high-voltage winding lies close to the budding core leg, that the high pulse voltage of the high-voltage winding also lies. Therefore, there are particular difficulties at this point in achieving the necessary dielectric strength.
  • Such transformers are tested with an overvoltage of 50%, so that in this case even higher pulse voltages occur, which reach the order of 40 KV over the entire high-voltage winding.
  • the invention is based on the object of designing the line transformer in such a way that the requirements for dielectric strength, in particular between the pulse-shaped voltage and the core of the transformer, can be mastered even with a narrow structure of the entire transformer.
  • the two ends of the entire high-voltage winding do not carry any pulse voltage, but are cold in terms of AC voltage.
  • One end of the high voltage winding can be directly grounded.
  • the other end of the high-voltage winding connected to the anode of the picture tube likewise does not carry any pulse voltage due to the effect of the capacitance of the picture tube, but only the direct anode voltage for the picture tube.
  • a DC voltage is, however, much less critical than a pulsed voltage with regard to the dielectric strength and the risk of arcing.
  • the high pulse voltage which inevitably occurs on the high-voltage winding, however, in the case of the invention is advantageously effective in its full amount only in the middle of the entire high-voltage winding.
  • the pulse voltage can be handled much better because the center of the high-voltage winding is far away from the two legs of the core that depart at right angles.
  • the unavoidable maximum pulse voltage is thus spatially moved to where it can best be mastered.
  • additional constructive measures can also be provided on the winding former, by means of which, for. B. the distance of the high-voltage rectifier from the core is increased.
  • the winding body is preferably made of Makrolon. This has a much better dielectric strength than a potting compound.
  • the division of the high-voltage winding and the interposed diode leads to a forced symmetry of the high-voltage winding. This reduces the safety surcharge required in known transformers when dimensioning the diode blocking voltage.
  • the aforementioned forced symmetry in connection with the absence of AC voltage at the ends of the winding leads to minimal interference radiation from the high-voltage winding.
  • the high-voltage winding is also divided into several partial windings, between which high-voltage rectifiers are arranged. There, however, no use is made of the solution according to the invention. Rather, the end of the high-voltage winding facing the picture tube is not cold in terms of AC voltage, but still carries a pulse voltage, which is to be avoided in the present invention.
  • 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, the picture tube 9, the capacitor 8 essentially formed by the picture tube 9, the coupling capacitor 10 also used for equalizing the tangents, and the line deflection coils 11.
  • the high-voltage winding for generating the high voltage of 24 KV for the picture tube 9 is divided into two sub-windings 12, 13 of the same size, between which the high-voltage rectifier 14 is located.
  • the mode of operation is explained with reference to FIG.
  • the lower end of the winding 13 is grounded and therefore carries neither a DC voltage nor an AC voltage. No problems can therefore arise at this end of the entire high-voltage winding.
  • the upper end of the winding 12 is also without pulse voltage due to the action of the capacitor 8, so that there is only a pure DC high voltage on the picture tube 9.
  • At the upper end of the winding 13 is the DC voltage-free pulse voltage a with an amplitude of z. B. 12.5 KV. If the upper end of the winding 13 carries a positive pulse with respect to earth, then the lower end of the winding 12 must carry a negative pulse b with the same winding direction of the windings 12, 13.
  • FIG. 3 shows the frame-shaped core with the three legs 15, 16, 17.
  • the leg 15 carries the winding body 18 for the high-voltage winding designed as a chamber winding.
  • the winding body 18 contains a wall 19, the width and diameter of which are greater than that of the other chamber walls 20.
  • Two rectifiers 14a and 14b connected in series are arranged on the outer circumference of the wall 19 for reasons of dielectric strength.
  • One end of the series connection of these two rectifiers is connected to the left part of the chamber winding, which represents the partial winding 13, and the other end of the series connection to the right part of the chamber winding, which represents the partial winding 12. It can be seen that the rectifiers 14, at which the pulse voltages a and b occur, now have a large distance from the legs 16, 17 and the particularly dangerous corners between the legs 16/15 and 17/15.
  • Figure 4 shows the arrangement of Figure 3 from below.
  • FIG. 5 shows a chamber winding as in FIGS. 3, 4, but which is advantageously adapted to the voltage ratios of the pulse voltage.
  • the windings 12, 13 are designed as a chamber winding and each consist of partial windings 21, which are in the chambers formed by the chamber walls 20 22 are arranged distributed.
  • another wall 19 is provided in the middle, on the circumference of which the rectifier 14 or the series connection of the rectifiers 14a and 14b are located.
  • the chambers 22 are rounded at the bottom by a groove 30. Avoiding a sharp corner improves the dielectric strength.
  • the groove 31 on the wall 19 has an even larger radius for this purpose.
  • the pulse voltage at the left and right ends of the total winding is zero and increases towards the middle.
  • This fact is the thickness d of the bobbin 18 at the bottom of each chamber 22 adapted by the wall thickness d increases from the two ends to the center, because yes there.
  • Pulse voltage has its maximum amplitude.
  • the insulation between the individual partial windings 21 and the primary winding 4 or the core 15 is therefore advantageously adapted to the actual amplitude of the effective pulse voltage. In this way, a particularly strong coupling between the high-voltage winding and the primary winding 4 can be achieved. This results in a low leakage inductance and thus the advantage of matching the leakage inductance to a high harmonic of the frequency of the return vibration in order to achieve a low internal resistance of the high-voltage source.
  • the respective first and last chamber is not provided with a partial winding 21 and can be used for the wire infeed.
  • the individual chambers 22 are filled differently with the partial windings 21. With such a different filling, the leakage inductance and thus the tuning to a harmonic can also be influenced.
  • FIG. 6 shows a special position of the rectifier 14 on the outer circumference of the chamber wall 19.
  • the rectifier 14 is arranged obliquely to the circumferential direction of the chamber wall 19. This position increases the distance between the connecting wires 25 of the rectifier 14 from the following chamber, that is to say at the other end of the rectifier 14. It can be seen that the lead wire 25 of the rectifier 14 is further from the chamber 22a lies as if the rectifier 14 were arranged exactly in the circumferential direction of the chamber wall 19. It is precisely between the connecting wire 25 and the winding in the chamber 22a that there is the greatest risk of arcing because there the voltage difference according to FIG. 2 is maximum.
  • the rectifier 14, as in FIG. 5, is arranged offset radially outward.
  • the chamber wall 19 does not have a continuously larger diameter than the other chamber walls 20.
  • the chamber wall 19 is rather only provided with a radially directed extension 26 at the location of the rectifier 14. In the remaining area, the chamber wall 19 has the same diameter as the other chamber walls 20.
  • the rectifier 14 is preferably on the chamber wall 19 by a fastening device, for. B. a snap-in connection.
  • the relatively rigid connecting wires of the rectifier 14 can simultaneously serve as support points for the relatively thin wire of the high-voltage winding 12.
  • the ends of the partial windings arranged in the chambers 22 are connected directly to the connecting wires of the rectifier 14. Their connecting wires thus take over the task of the pins otherwise provided on a coil former and serving as a base.
  • the primary winding 4, the high-voltage windings 12, 13 and the rectifier 14 are cast together in a cast resin block and thus surrounded on all sides by the resin. This creates a tension-proof and fireproof unit.
  • a resin for. B. a thermosetting epoxy resin or a polyester resin can be used.
  • the cast resin block containing the named components then has four connections, namely the connections for the primary winding 4, the output for the high voltage according to c in FIG. 1 and the output for the lower end of the winding 13, which is grounded when the transformer is installed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Details Of Television Scanning (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Television Receiver Circuits (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Details Of Television Systems (AREA)
  • Communication Cables (AREA)
  • Rectifiers (AREA)

Abstract

In a horizontal deflection circuit output transformer for a television receiver, which transformer includes a primary coil, a secondary coil inductively coupled to the primary coil, and a rectifier connected to the secondary coil and cooperating therewith to generate a high voltage for the picture tube, the secondary coil is divided into two partial windings and the rectifier is located physically between the partial windings.

Description

Der Zeilentransformator eines Fernsehempfängers erzeugt bekanntlich mittels einer Hochspannungswicklung und eines Hochspannungsgleichrichters u. a. die Hochspannung für die Bildröhre in der Größenordnung von 25 KV. Diese Spannung wird durch Gleichrichtung der impulsförmigen Rücklaufspannung gewonnen. Wegen dieser hohen impulsförmigen Spannung werden an die Spannungsfestigkeit des Zeilentransformators besonders hohe Anforderungen gestellt, da derart hohe Impulsspannungen leicht zu Überschlägen und Sprüherscheinungen führen können.The line transformer of a television receiver produces, as is known, by means of a high-voltage winding and a high-voltage rectifier and the like. a. the high voltage for the picture tube in the order of 25 KV. This voltage is obtained by rectifying the pulse-shaped return voltage. Because of this high pulse-shaped voltage, particularly high demands are placed on the dielectric strength of the line transformer, since such high pulse voltages can easily lead to flashovers and spray phenomena.

Der Zeilentransformator enthält im allgemeinen einen rahmenförmigen Kern mit einem Luftspalt, wobei bei dem Prinzip des Einschenkeltrafos die Primärwicklung und die Hochspannungswicklung übereinander auf demselben Schenkel des Kerns angeordnet sind. Dabei ist man bemüht, den Kern aus Kosten- und Gewichtsgründen möglichst klein zu bemessen. Das führt dazu, daß die Hochspannungswicklung praktisch die gesamte Länge eines Schenkels des Kerns einnimmt, d. h. bis an die von diesem Schenkel rechtwinklig abgehenden weiteren Schenkel heranreicht. Gerade an diesen Stellen, wo das Ende der Hochspannungswicklung eng an dem angehenden Kernschenkel liegt, liegt aber auch die hohe Impulsspannung der Hochspannungswicklung. Daher gibt es besonders an dieser Stelle besondere Schwierigkeiten, die notwendige Spannungsfestigkeit zu erzielen.The line transformer generally contains a frame-shaped core with an air gap, with the principle of the single-leg transformer, the primary winding and the high-voltage winding being arranged one above the other on the same leg of the core. One tries to make the core as small as possible for reasons of cost and weight. As a result, the high voltage winding takes up practically the entire length of one leg of the core, i. H. as far as the other legs extending at right angles from this leg. It is precisely at these points, where the end of the high-voltage winding lies close to the budding core leg, that the high pulse voltage of the high-voltage winding also lies. Therefore, there are particular difficulties at this point in achieving the necessary dielectric strength.

Die Prüfung derartiger Transformatoren erfolgt mit einer Überspannung von 50 %, so daß in diesem Fall noch weit höhere Impulsspannungen auftreten, die die Größenordnung von 40 KV über der gesamten Hochspannungswicklung erreichen.Such transformers are tested with an overvoltage of 50%, so that in this case even higher pulse voltages occur, which reach the order of 40 KV over the entire high-voltage winding.

Der Erfindung liegt die Aufgabe zugrunde, den Zeilentransformator so auszubilden, daß sich die Anforderungen an die Spannungsfestigkeit, insbesondere zwischen der impulsförmigen Spannung und dem Kern des Trafos, auch bei engem Aufbau des gesamten Trafos beherschen lassen.The invention is based on the object of designing the line transformer in such a way that the requirements for dielectric strength, in particular between the pulse-shaped voltage and the core of the transformer, can be mastered even with a narrow structure of the entire transformer.

Diese Aufgabe wird durch die im Anspruch 1 beschriebene Erfindung gelöst.This object is achieved by the invention described in claim 1.

Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.Advantageous developments of the invention are described in the dependent claims.

Durch die Erfindung wird in vorteilhafter Weise erreicht, daß die beiden Enden der gesamten Hochspannungswicklung keine Impulsspannung führen, sondern wechselspannungsmäßig kalt sind. Das eine Ende der Hochspannungswicklung kann direkt geerdet sein. Das andere, mit der Anode der Bildröhre verbundene Ende der Hochspannungswicklung führt durch die Wirkung der Kapazität der Bildröhre ebenfalls keine Impulsspannung, sondern nur die Anodengleichspannung für die Bildröhre. Eine Gleichspannung ist aber hinsichtlich der Spannungsfestigkeit und der Überschlagsgefahr wesentlich weniger kritisch als eine impulsförmige Spannung. Die unvermeidbar an der Hochspannungswicklung auftretende hohe Impulsspannung indessen wird bei der Erfindung in vorteilhafter Weise in ihrer vollen Höhe nur in der Mitte der gesamten Hochspannungswicklung wirksam.It is advantageously achieved by the invention that the two ends of the entire high-voltage winding do not carry any pulse voltage, but are cold in terms of AC voltage. One end of the high voltage winding can be directly grounded. The other end of the high-voltage winding connected to the anode of the picture tube likewise does not carry any pulse voltage due to the effect of the capacitance of the picture tube, but only the direct anode voltage for the picture tube. A DC voltage is, however, much less critical than a pulsed voltage with regard to the dielectric strength and the risk of arcing. The high pulse voltage which inevitably occurs on the high-voltage winding, however, in the case of the invention is advantageously effective in its full amount only in the middle of the entire high-voltage winding.

Dort läßt sich die Impulsspannung aber wesentlich besser beherschen, weil die Mitte der Hochspannungswicklung von den beiden rechtwinklig abgehenden Schenkeln des Kerns weit entfernt ist. Bei der Erfindung wird also die unvermeidbare maximale Impulsspannung räumlich dorthin verlegt, wo sie sich am besten beherschen läßt. In der Mitte der Hochspannungswicklung können außerdem am Wickelkörper zusätzliche konstruktive Maßnahmen vorgesehen sein, durch die z. B. der Abstand des Hochspannungsgleichrichters vom Kern noch vergrößert wird. Der Wickelkörper wird vorzugsweise aus Makrolon hergestellt. Dieser hat eine weitaus bessere Spannungsfestigkeit als eine Vergußmasse.There, however, the pulse voltage can be handled much better because the center of the high-voltage winding is far away from the two legs of the core that depart at right angles. In the case of the invention, the unavoidable maximum pulse voltage is thus spatially moved to where it can best be mastered. In the middle of the high-voltage winding, additional constructive measures can also be provided on the winding former, by means of which, for. B. the distance of the high-voltage rectifier from the core is increased. The winding body is preferably made of Makrolon. This has a much better dielectric strength than a potting compound.

Die Aufteilung der Hochspannungswicklung und die dazwischengeschaltete Diode führt zu einer Zwangssymmetrie der Hochspannungswicklung. Dadurch wird der an sich bei bekannten Transformatoren notwendige Sicherheitszuschlag bei der Bemessung der Diodensperrspannung verringert. Die genannte Zwangssymmetrierung in Verbindung mit Wechselspannungsfreiheit der Enden der Wicklung führt zu einer minimalen Störstrahlung der Hochspannungswicklung.The division of the high-voltage winding and the interposed diode leads to a forced symmetry of the high-voltage winding. This reduces the safety surcharge required in known transformers when dimensioning the diode blocking voltage. The aforementioned forced symmetry in connection with the absence of AC voltage at the ends of the winding leads to minimal interference radiation from the high-voltage winding.

Beim sogenannten Diodensplittrafo (Funktechnik 1979 Nr. 4 Seite T 183-184) ist zwar auch die Hochspannungswicklung in mehrere Teilwicklungen aufgeteilt, zwischen denen Hochspannungsgleichrichter angeordnet sind. Dort wird aber von der erfindungsgemäßen Lösung kein Gebrauch gemacht. Vielmehr ist dort das der Bildröhre zugewandte Ende der Hochspannungswicklung wechselspannungsmäßig nicht kalt, sondern führt noch eine Impulsspannung, die bei der vorliegenden Erfindung gerade vermieden werden soll.In the so-called diode split transformer (radio technology 1979 No. 4 page T 183-184), the high-voltage winding is also divided into several partial windings, between which high-voltage rectifiers are arranged. There, however, no use is made of the solution according to the invention. Rather, the end of the high-voltage winding facing the picture tube is not cold in terms of AC voltage, but still carries a pulse voltage, which is to be avoided in the present invention.

Die Erfindung wird im folgenden anhand der Zeichnung an einem Ausführungsbeispiel erläutert.The invention is explained below with reference to the drawing using an exemplary embodiment.

Darin zeigen

  • Figur 1 ein Prinzipschaltbild der Erfindung,
  • Figur 2 Kurven zur Erläuterung der Wirkungsweise,
  • Figur 3, 4 im Prinzip einen Aufbau des Wickelkörpers für die Hochspannungswicklung,
  • Figur 5 eine spezielle Ausbildung des Wickelkörpers für eine Kammerwicklung,
  • Figur 6 eine besondere geometrische Anordnung des Gleichrichters und
  • Figur 7 eine spezielle Ausführung des Wickelkörpers zur Erzielung einer hohen Spannungsfestigkeit.
Show in it
  • FIG. 1 shows a basic circuit diagram of the invention,
  • FIG. 2 curves to explain the mode of action,
  • 3, 4 in principle a structure of the winding body for the high-voltage winding,
  • 5 shows a special design of the winding body for a chamber winding,
  • 6 shows a special geometric arrangement of the rectifier and
  • Figure 7 shows a special design of the winding body to achieve a high dielectric strength.

In Figur 1, 2 zeigen die kleinen Buchstaben a-c, an welchen Punkten in Figur 1 die Spannungen gemäß Figur 2 auftreten.In Figures 1, 2, the small letters ac indicate the points at which the voltages in Figure 1 occur according to Figure 2.

Figur 1 zeigt den von der zeilenfrequenten Schaltspannung 1 gesteuerten Zeilenendstufentransistor 2, den Zeilentrafo 3 mit der Primärwicklung 4, die Bildröhre 9, den im wesentlichen durch die Bildröhre 9 gebildeten Kondensator8, den auch zur Tangensentzerrung dienenden Koppelkondensator10 sowie die Zeilenablenkspulen 11.1 shows the line output stage transistor 2 controlled by the line-frequency switching voltage 1, the line transformer 3 with the primary winding 4, the picture tube 9, the capacitor 8 essentially formed by the picture tube 9, the coupling capacitor 10 also used for equalizing the tangents, and the line deflection coils 11.

Die Hochspannungswicklung zur Erzeugung der Hochspannung von 24 KV für die Bildröhre 9 ist in zwei gleich große Teilwicklungen 12, 13 aufgeteilt, zwischen denen der Hochspannungsgleichrichter 14 liegt.The high-voltage winding for generating the high voltage of 24 KV for the picture tube 9 is divided into two sub-windings 12, 13 of the same size, between which the high-voltage rectifier 14 is located.

Anhand der Figur 2 wird die Wirkungsweise erläutert. Das untere Ende der Wicklung 13 ist geerdet und führt somit weder eine Gleichspannung noch eine Wechselspannung. An diesem Ende der gesamten Hochspannungswicklung können daher keine Probleme auftreten. Das obere Ende der Wicklung 12 ist durch die Wirkung des Kondensators 8 ebenfalls ohne Impulsspannung, so daß an der Bildröhre 9 nur eine reine Gleich-Hochspannung steht. Am oberen Ende der Wicklung 13 steht die gleichspannungsfreie Impulsspannung a mit einer Amplitude von z. B. 12,5 KV. Wenn das obere Ende der Wicklung 13 gegenüber Erde einen positiven Impuls führt, so muß bei gleicher Wicklungsrichtung der Wicklungen 12, 13 das untere Ende der Wicklung 12 einen negativen Impuls b führen. Durch die Wirkung des Gleichrichters 14 kann die Spannung b nicht unter die Spannung a sinken. Das hat zur Folge, daß die Impulsspitzen der Spannung b auf die Impulsspitzen der Spannung a geklemmt werden. Am oberen Ende der Wicklung 12 entsteht dann durch die Wirkung des Kondensators 8 die reine Gleichspannung c, die die Hochspannung für die Bildröhre 9 darstellt. Es ist ersichtlich, daß die Enden der gesamten Hochspannungswicklung, d. h. das untere Ende der Wicklung 13 und das obere Ende der Wicklung 12, in vorteilhafter Weise keine Impulsspannung führen. Diese Impulsspannung liegt, wie Figur 2 zeigt, in vorteilhafter Weise nur in der Mitte der Wicklung an den beiden Enden des Gleichrichters 14.The mode of operation is explained with reference to FIG. The lower end of the winding 13 is grounded and therefore carries neither a DC voltage nor an AC voltage. No problems can therefore arise at this end of the entire high-voltage winding. The upper end of the winding 12 is also without pulse voltage due to the action of the capacitor 8, so that there is only a pure DC high voltage on the picture tube 9. At the upper end of the winding 13 is the DC voltage-free pulse voltage a with an amplitude of z. B. 12.5 KV. If the upper end of the winding 13 carries a positive pulse with respect to earth, then the lower end of the winding 12 must carry a negative pulse b with the same winding direction of the windings 12, 13. Due to the action of the rectifier 14, the voltage b cannot drop below the voltage a. As a result, the pulse peaks of voltage b are clamped onto the pulse peaks of voltage a. At the upper end of the winding 12, the effect of the capacitor 8 then produces the pure DC voltage c, which represents the high voltage for the picture tube 9. It can be seen that the ends of the entire high voltage winding, e.g. H. the lower end of the winding 13 and the upper end of the winding 12, advantageously no pulse voltage. As shown in FIG. 2, this pulse voltage is advantageously only in the middle of the winding at the two ends of the rectifier 14.

Figur 3 zeigt den rahmenförmigen Kern mit den drei Schenkeln 15, 16, 17. Der Schenkel 15 trägt den Wickelkörper 18 für die als Kammerwicklung ausgebildete Hochspannungswicklung. In der Mitte enthält der Wickelkörper 18 eine Wand 19, deren Breite und Durchmesser größer sind als die der übrigen Kammerwände 20. Am äußeren Umfang der Wand 19 sind aus Gründen der Spannungsfestigkeit zwei in Reihe geschaltete Gleichrichter 14a und 14b angeordnet. Das eine Ende der Reihenschaltung dieser beiden Gleichrichter ist mit dem linken Teil der Kammerwicklung verbunden, die die Teilwicklung 13 darstellt, und das andere Ende der Reihenschaltung mit dem rechten Teil der Kammerwicklung, die die Teilwicklung 12 darstellt. Es ist ersichtlich, daß die Gleichrichter 14, an denen die Impulsspannungen a und b auftreten, nunmehr einen großen Abstand von den Schenkeln 16, 17 und den besonders gefährlichen Ecken zwischen den Schenkeln 16/15 und 17/15 aufweisen.Figure 3 shows the frame-shaped core with the three legs 15, 16, 17. The leg 15 carries the winding body 18 for the high-voltage winding designed as a chamber winding. In the middle, the winding body 18 contains a wall 19, the width and diameter of which are greater than that of the other chamber walls 20. Two rectifiers 14a and 14b connected in series are arranged on the outer circumference of the wall 19 for reasons of dielectric strength. One end of the series connection of these two rectifiers is connected to the left part of the chamber winding, which represents the partial winding 13, and the other end of the series connection to the right part of the chamber winding, which represents the partial winding 12. It can be seen that the rectifiers 14, at which the pulse voltages a and b occur, now have a large distance from the legs 16, 17 and the particularly dangerous corners between the legs 16/15 and 17/15.

Figur 4 zeigt die Anordnung nach Figur 3 von unten.Figure 4 shows the arrangement of Figure 3 from below.

Figur 5 zeigt eine Kammerwicklung wie in Figur 3, 4, die jedoch den Spannungsverhältnissen der Impulsspannung in vorteilhafter Weise angepaßt ist. Auf dem Schenkel 15 des Zeilentrafos 3 befindet sich die Primärwicklung 4 und darüber der Spulenkörper 18 für die beiden Wicklungen 12, 13. Die Wicklungen 12, 13 sind als Kammerwicklung ausgebildet und bestehen je aus Teilwicklungen 21, die in den durch die Kammerwände 20 gebildeten Kammern 22 verteilt angeordnet sind. Wie in Figur 3, 4 ist in der Mitte wieder eine weitere Wand 19 vorgesehen, an deren Umfang sich der Gleichrichter 14 oder die Reihenschaltung der Gleichrichter 14a und 14b befinden. Die Kammern 22 sind an ihrem Grund durch eine Hohlkehle 30 abgerundet. Durch die Vermeidung einer scharfen Ecke wird die Spannungsfestigkeit verbessert. Die Hohkehle 31 an der Wand 19 hat zu diesem Zweck einen noch größeren Radius.FIG. 5 shows a chamber winding as in FIGS. 3, 4, but which is advantageously adapted to the voltage ratios of the pulse voltage. On the leg 15 of the line transformer 3 there is the primary winding 4 and above it the coil former 18 for the two windings 12, 13. The windings 12, 13 are designed as a chamber winding and each consist of partial windings 21, which are in the chambers formed by the chamber walls 20 22 are arranged distributed. As in FIGS. 3, 4, another wall 19 is provided in the middle, on the circumference of which the rectifier 14 or the series connection of the rectifiers 14a and 14b are located. The chambers 22 are rounded at the bottom by a groove 30. Avoiding a sharp corner improves the dielectric strength. The groove 31 on the wall 19 has an even larger radius for this purpose.

Wie bereits ausgeführt, ist die Impulsspannung am linken und rechten Ende der Gesamtwicklung null und nimmt zur Mitte hin zu. Dieser Tatsache ist die Stärke d des Spulenkörpers 18 am Grund jeweils einer Kammer 22 angepaßt, indem die Wandstärke d von den beiden Enden zur Mitte hin zunimmt, weil ja dort die. Impulsspannung ihre maximale Amplitude hat. Die Isolation zwischen den einzelnen Teilwicklungen 21 und der Primärwicklung 4 bzw. dem Kern 15 ist also in vorteilhafter Weise der tatsächlichen Amplitude der wirksamen Impulsspannung angepaßt. Auf diese Weise läßt sich eine besonders feste Kopplung zwischen der Hochspannungswicklung und der Primärwicklung 4 erreichen. Dadurch ergibt sich eine geringe Streuinduktivität und somit der Vorteil, die Streuinduktivität zur Erzielung eines geringen Innenwiderstandes der Hochspannungsquelle auf eine hohe Harmonische der Frequenz der Rücklaufschwingung abzustimmen.As already stated, the pulse voltage at the left and right ends of the total winding is zero and increases towards the middle. This fact is the thickness d of the bobbin 18 at the bottom of each chamber 22 adapted by the wall thickness d increases from the two ends to the center, because yes there. Pulse voltage has its maximum amplitude. The insulation between the individual partial windings 21 and the primary winding 4 or the core 15 is therefore advantageously adapted to the actual amplitude of the effective pulse voltage. In this way, a particularly strong coupling between the high-voltage winding and the primary winding 4 can be achieved. This results in a low leakage inductance and thus the advantage of matching the leakage inductance to a high harmonic of the frequency of the return vibration in order to achieve a low internal resistance of the high-voltage source.

Die jeweils erste und letzte Kammer ist nicht mit einer Teilwicklung 21 versehen und kann zu Einlaufzwecken für den Draht verwendet werden.The respective first and last chamber is not provided with a partial winding 21 and can be used for the wire infeed.

Wie Figur 5 zeigt, sind die einzelnen Kammern 22 unterschiedlich mit den Teilwicklungen 21 gefüllt. Durch eine solche unterschiedliche Füllung läßt sich die Streuinduktivität und damit die Abstimmung auf eine Harmonische ebenfalls beeinflussen.As FIG. 5 shows, the individual chambers 22 are filled differently with the partial windings 21. With such a different filling, the leakage inductance and thus the tuning to a harmonic can also be influenced.

Figur 6 zeigt eine besondere Lage des Gleichrichters 14 am äußeren Umfang der Kammerwand 19. Der Gleichrichter 14 ist schräg zur Umfangrichtung der Kammerwand 19 angeordnet. Durch diese Lage wird der Abstand der Anschlußdrähte 25 des Gleichrichters 14 zur folgenden d. h. am anderen Ende des Gleichrichters 14 liegenden Kammer vergrößert. Es ist ersichtlich, daß der Anschlußdraht 25 des Gleichrichters 14 weiter von der Kammer 22a entfernt liegt, als wenn der Gleichrichter 14 genau in Umfangrichtung der Kammerwand 19 angeordnet wäre. Gerade zwischen dem Anschlußdraht 25 und der Wicklung in der Kammer 22a besteht die größte Überschlagsgefahr, weil dort die Spannungsdifferenz gemäß Figur 2 maximal Ist.FIG. 6 shows a special position of the rectifier 14 on the outer circumference of the chamber wall 19. The rectifier 14 is arranged obliquely to the circumferential direction of the chamber wall 19. This position increases the distance between the connecting wires 25 of the rectifier 14 from the following chamber, that is to say at the other end of the rectifier 14. It can be seen that the lead wire 25 of the rectifier 14 is further from the chamber 22a lies as if the rectifier 14 were arranged exactly in the circumferential direction of the chamber wall 19. It is precisely between the connecting wire 25 and the winding in the chamber 22a that there is the greatest risk of arcing because there the voltage difference according to FIG. 2 is maximum.

In Figur 7 ist zur Verbesserung der Spannungsfestigkeit der Gleichrichter 14 wie in Figur 5 radial nach außen versetzt angeordnet. Die Kammerwand 19 hat jedoch nicht einen durchgehend größeren Durchmesser als die übrigen Kammerwände 20. Die Kammerwand 19 ist vielmehr nur an der Stelle des Gleichrichters 14 mit einem radial gerichteten Ansatz 26 versehen. Im übrigen Bereich hat die Kammerwand 19 den gleichen Durchmesser wie die übrigen Kammerwände 20.In FIG. 7, to improve the dielectric strength, the rectifier 14, as in FIG. 5, is arranged offset radially outward. However, the chamber wall 19 does not have a continuously larger diameter than the other chamber walls 20. The chamber wall 19 is rather only provided with a radially directed extension 26 at the location of the rectifier 14. In the remaining area, the chamber wall 19 has the same diameter as the other chamber walls 20.

Der Gleichrichter 14 wird vorzugsweise an der Kammerwand 19 durch eine Befestigungseinrichtung, z. B. einer snap-in-Verbindung gehaltert. Bei dieser Lösung können die relativ starren Anschlußdrähte des Gleichrichters 14 gleichzeitig als Stützpunkte für den relativ dünnen Draht der Hochspannungswicklung 12 dienen. Beim Wickelvorgang werden also die Enden der in den Kammern 22 angeordneten Teilwicklungen direkt mit den Anschlußdrähten des Gleichrichters 14 verbunden. Deren Anschlußdrähte übernehmen somit die Aufgabe der sonst an einem Spulenkörper vorgesehenen, als Stützpunkt dienenden Stifte.The rectifier 14 is preferably on the chamber wall 19 by a fastening device, for. B. a snap-in connection. In this solution, the relatively rigid connecting wires of the rectifier 14 can simultaneously serve as support points for the relatively thin wire of the high-voltage winding 12. During the winding process, the ends of the partial windings arranged in the chambers 22 are connected directly to the connecting wires of the rectifier 14. Their connecting wires thus take over the task of the pins otherwise provided on a coil former and serving as a base.

Die Primärwicklung 4, die Hochspannungswicklungen 12, 13 und der Gleichrichter 14 sind gemeinsam in einem Gießharzblock vergossen und somit allseitig von dem Harz umgeben. Dadurch ergibt sich eine spannungsfeste und feuerfeste Einheit. Als Harz kann z. B. ein heißhärtendes Epoxidharz oder auch ein Polyesterharz verwendet werden. Der die genannten Bauteile enthaltende Gießharzblock hat dann vier Anschlüsse, nämlich die Anschlüsse für die Primärwicklung 4, den Ausgang für die Hochspannung gemäß c in Figur 1 und den Ausgang für das untere Ende der Wicklung 13, der beim Einbau des Transformators geerdet wird.The primary winding 4, the high-voltage windings 12, 13 and the rectifier 14 are cast together in a cast resin block and thus surrounded on all sides by the resin. This creates a tension-proof and fireproof unit. As a resin, for. B. a thermosetting epoxy resin or a polyester resin can be used. The cast resin block containing the named components then has four connections, namely the connections for the primary winding 4, the output for the high voltage according to c in FIG. 1 and the output for the lower end of the winding 13, which is grounded when the transformer is installed.

Claims (20)

1. Line transformer for a television receiver having a primary winding (4), a high voltage winding (12, 13) from the impulsive voltage of which the high voltage for the picture tube (9) is derived with the aid of a rectifier (14), characterised in that the high voltage winding is divided into two part windings (12, 13) and the rectifier (14) is positioned between these part windings.
2. Line transformer according to Claim 1, characterised in that both the part windings (12, 13) are equally large.
3. Line transformer according to Claim 1, characterised in that two rectifiers (14a, 14b) are connected in series.
4. Line transformer according to Claim 1, characterised in that there is a frame shaped core (15-17) on the limb (15) of which the primary winding (4) and the high voltage winding (12, 13) are arranged one over the other.
5. Line transformer according to Claim 1, characterised in that the insulating separation (d) between the primary winding (4) and the high voltage winding (12, 13) has a maximum at the centre of the windings and diminishes towards the end of the windings (Fig. 5).
6. Line transformer according to Claim 1, characterised in that the high voltage winding (12, 13) is constructed as a compartmented winding.
7. Line transformer according to Claim 5 and 6, characterised in that, at the base of the compartment (22), the wall thickness (d) of the coil former (18) for the compartmented winding increases from the end to the middle of the coil former (18).
8. Line transformer according to Claim 6, characterised in that the annular faces at the base of a compartment (20) are rounded off in flute-like manner (30, 31).
9. Line transformer according to Claim 8, characterised in that the rounded faces are different at the two faces (30, 31 in Fig. 5).
10. Line transformer according to Claim 9, characterised in that, at the compartments immediately adjacent to the compartment wall (19) carrying the rectifier (14), the face (31) turned towards the compartment wall (19) displays the larger rounding off radius.
11. Line transformer according to Claim 1, characterised in that the primary winding (4) which lies beneath the high voltage winding projects in the axial direction beyond the high voltage winding (Fig. 5).
12. Line transformer according to Claim 1, characterised in that the first and/or the last compartment is not occupied by a part winding (21, Fig. 5).
13. Line transformer according to Claim 6, characterised in that the excitation of the high voltage winding at a harmonic of the frequency of the flyback oscillation is achieved by filling the compartments (22) with the high frequency winding to different extents.
14. Line transformer according to Claim 6, characterised in that the rectifier (14) is positioned at the outer circumference of a compartment wall (19) the thickness and diameter of which are larger than those of the other compartment walls.
15. Line transformer according to Claim 14, characterised in that the compartment wall (19) has an enlarged dimension (26) in a radial direction only at the position of the rectifier (14) and shows, over the remaining circumference, the same diameter as the other compartment walls (20, Fig. 5, 6, 7).
16. Line transformer according to Claim 14, characterised in that the rectifier (14) is arranged obliquely with respect to the circumferential direction of the compartment wall (19, Fig. 6).
17. Line transformer according to Claim 14, characterised in that the compartment wall (19) has a positioning and securing means for the rectifier (14) and the wire terminals (25) of the high voltage windings (12, 13) are connected directly to the connecting wires of the rectifier (14).
18. Line transformer according to Claim 6, characterised in that the compartment winding (21) is arranged asymmetrically with respect to the core (15) and the distances of the winding groups with reference to the core (15) are optimised according to the voltage loading.
19. Line transformer according to Claim 1, characterised in that further windings are arranged on a free limb of the core (15), such for example as auxiliary windings for the derivation of fly back impulses.
20. Line transformer according to Claim 1, characterised in that the primary winding (4), the high frequency windings (12, 13) and the rectifier (14) are sealed together by a sealing resin, such for example as a thermosetting epoxy resin or a polyester resin.
EP81100252A 1980-01-21 1981-01-15 Line output transformer for television receiver Expired EP0033450B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100252T ATE5355T1 (en) 1980-01-21 1981-01-15 LINE TRANSFORMER FOR A TELEVISION RECEIVER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3001975 1980-01-21
DE19803001975 DE3001975A1 (en) 1980-01-21 1980-01-21 LINE TRANSFORMER FOR A TELEVISION RECEIVER

Publications (2)

Publication Number Publication Date
EP0033450A1 EP0033450A1 (en) 1981-08-12
EP0033450B1 true EP0033450B1 (en) 1983-11-16

Family

ID=6092532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100252A Expired EP0033450B1 (en) 1980-01-21 1981-01-15 Line output transformer for television receiver

Country Status (8)

Country Link
US (1) US4406978A (en)
EP (1) EP0033450B1 (en)
JP (1) JPS56109073A (en)
AT (1) ATE5355T1 (en)
BR (1) BR8100290A (en)
DE (2) DE3001975A1 (en)
ES (1) ES8200803A1 (en)
HK (1) HK103588A (en)

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JPS57135680A (en) * 1981-02-12 1982-08-21 Murata Mfg Co Ltd Flyback transformer
US4507721A (en) * 1982-07-28 1985-03-26 Nippon Telegraph & Telephone Public Corporation DC-DC Converter for remote power feeding
JPS6374083U (en) * 1986-10-31 1988-05-17
JPS6379615U (en) * 1986-11-14 1988-05-26
DE3733458A1 (en) * 1987-09-30 1989-04-13 Electronic Werke Deutschland Line transformer for a television receiver (television set)
DE3902219A1 (en) * 1989-01-26 1990-08-02 Electronic Werke Deutschland Compartment coil former for the high-tension transformer of a television receiver
DE59202215D1 (en) * 1991-08-22 1995-06-22 Thomson Brandt Gmbh Diode split high voltage transformer for a television receiver.
DE4129678A1 (en) * 1991-09-06 1993-03-11 Thomson Brandt Gmbh Divide split high voltage transformer for high-scan TV receiver with HV of 35kV
DE4300624A1 (en) * 1993-01-13 1994-07-14 Thomson Brandt Gmbh HV line transformer for TV receiver
ATE180101T1 (en) * 1992-08-04 1999-05-15 Thomson Brandt Gmbh HIGH VOLTAGE FLYER TRANSFORMER FOR A TELEVISION RECEIVER
DE19543673A1 (en) * 1995-11-23 1997-05-28 Thomson Brandt Gmbh High voltage transformer for use with a TV receiver
DE19510678A1 (en) * 1995-03-27 1996-10-02 Thomson Brandt Gmbh High voltage transformer for a television receiver
FR2756967B1 (en) * 1996-12-09 1999-01-08 Thomson Television Components TRANSFORMER FOR HIGH-CUT FREQUENCY POWER SUPPLY
TW369654B (en) * 1997-07-07 1999-09-11 Thomson Brandt Gmbh Diode-split high-voltage transformer
JP7055435B2 (en) * 2017-07-04 2022-04-18 テグ キョンブク インスティトゥート オブ サイエンス アンド テクノロジー Linear variable differential transducer

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Also Published As

Publication number Publication date
ES498632A0 (en) 1981-11-16
HK103588A (en) 1988-12-30
ES8200803A1 (en) 1981-11-16
DE3161388D1 (en) 1983-12-22
JPH0338792B2 (en) 1991-06-11
EP0033450A1 (en) 1981-08-12
BR8100290A (en) 1981-08-04
ATE5355T1 (en) 1983-12-15
JPS56109073A (en) 1981-08-29
DE3001975A1 (en) 1981-07-23
US4406978A (en) 1983-09-27

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