EP0561839B1 - High-voltage transformer - Google Patents

High-voltage transformer Download PDF

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Publication number
EP0561839B1
EP0561839B1 EP91920765A EP91920765A EP0561839B1 EP 0561839 B1 EP0561839 B1 EP 0561839B1 EP 91920765 A EP91920765 A EP 91920765A EP 91920765 A EP91920765 A EP 91920765A EP 0561839 B1 EP0561839 B1 EP 0561839B1
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EP
European Patent Office
Prior art keywords
winding
transformer according
transformer
cells
voltage
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EP91920765A
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German (de)
French (fr)
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EP0561839A1 (en
Inventor
Walter Goseberg
Wolfgang Reichow
Hans-Werner Sander
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Deutsche Thomson Brandt GmbH
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Deutsche Thomson Brandt GmbH
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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
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • 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 invention is based on a high-voltage transformer according to the preamble of claim 1.
  • a transformer is known from DE-OS 35 14 308.
  • Such transformers generate a high voltage for television receivers in the order of 25 kV.
  • the object of the invention is to reduce the power loss occurring at the transformer in such a high-voltage transformer. This object is achieved by the invention specified in claim 1. Advantageous developments of the invention are specified in the subclaims.
  • the invention is initially based on an analysis of the total loss types occurring in such a transformer.
  • a first type of loss consists in the ferrite losses due to magnetization of the core in accordance with the area formed by the hysteresis curve. Such losses can only be reduced by ferrite material of higher quality.
  • a second type of loss consists of copper losses due to the ohmic resistance of the wire and the skin effect.
  • a third type of loss is the loss in the high voltage rectifier diode due to the forward voltage and the forward current, the reverse voltage and the reverse current and the switch losses when switching from the blocked to the conductive state and vice versa.
  • a fourth type of loss consists of dielectric losses due to displacement currents in the dielectric generally formed by a potting resin.
  • the first three types of loss have lower limits, particularly for technological reasons and due to the available components.
  • the invention now turns to the fourth type of loss.
  • the invention is based on the following consideration.
  • the dielectric losses occur in particular in the area between the primary winding and the secondary winding or high-voltage winding because the greatest voltage differences exist here. If it is possible to make this area largely electrically free of fields, the dielectric losses can be reduced considerably. In the invention, this is achieved only by a particularly advantageous division of the pulse voltages on the primary winding and on the secondary winding, in such a way that in the area mentioned on the primary winding and on the secondary winding, the pulses have approximately the same amplitude and polarity.
  • the difference in the pulse voltages on the two windings practically disappears, so that in the desired manner an electrically field-free space is achieved and losses due to dielectric displacement currents are largely avoided.
  • a major advantage is that the field-free space is not achieved by additional means, but only by a clever arrangement of the parts that are required anyway.
  • the harmonic content of the generated voltages is also reduced by the reduction of the dielectric displacement currents in the dielectric surrounding the windings. This leads to fewer natural resonances that are otherwise triggered by displacement currents. This reduction in harmonics causes an improvement in the internal resistance and also a reduction in the acoustic noises occurring at the transformer. Overall, the material surrounding the windings, preferably a cast resin, is also less stressed.
  • the bobbin 7 is supported on the core 1, which carries the primary winding 3.
  • the primary winding 3 consists of six layers.
  • the winding end from the lower layer is connected to terminal b with the operating voltage + UB.
  • the winding end from the upper layer is connected to terminal d and to switching transistor 13, which is controlled at terminal c with a line-frequency switching voltage Z.
  • the pulse voltage at terminal b is zero.
  • the pulse voltage at terminal d has the full value of the return voltage of +1200 volts. The pulse voltage thus increases continuously from winding to winding from the value zero at terminal b to the maximum value at terminal d.
  • the pulse voltage over the axial length of the upper layer of the winding 3 decreases by about 16% and the pulse voltage at the right end of the upper layer is +1000 volts.
  • the pulse voltage is therefore largely constant in the upper position of the winding 3 over the axial length of the coil body 7 and has an average value of 1100 volts.
  • the chamber coil former 2 Arranged above the coil former 7 with the primary winding 3 is the chamber coil former 2, which has a total of 16 chambers Ka to Kp formed by walls 8, which are filled with partial windings 4a to 4p of the secondary winding or high-voltage winding 4.
  • the winding end from the upper layer of the first partial winding 4a is connected to earth.
  • the winding end at the bottom of a chamber K is one with the anode High-voltage rectifier diode 6 connected, the cathode of which is connected in each case to the winding end from the upper end of the next partial winding 4.
  • the end of the winding from the bottom of the last partial winding 4p in the bracket Kp forms the high-voltage terminal a.
  • the winding process for the entire secondary winding 4 begins at the bottom of the chamber Kp. Since there is a diode 6 between each two chambers, a total of 15 diodes 6 are provided for a total of 16 chambers K. A high voltage UH of 32 kV develops at terminal a. With these assumed values, there is a pulse of +1100 volts at the bottom of a chamber K, which is the same in all chambers. At the upper end of winding 4 there is a pulse of -1300 volts.
  • the high-voltage winding 4 also produces pulses with the constant amplitude of +1100 volts in the area assigned to the winding 3, that is to say in the area of the lower ends of the chambers.
  • the pulses on the winding 3 and on the winding 4 are also simultaneous. There is therefore practically no voltage difference between the pulses on the winding 3 and the pulses on the winding 4, so that the electrically field-free space indicated by the dash-dotted line F results.
  • the pulses at the upper end of the windings 4 have the wrong negative polarity to form the field-free space. However, the pulses there are so far removed from the primary winding 3 that they no longer cause any significant displacement currents through the dielectric.
  • the upper end of the first winding 4a is grounded and therefore carries no pulse voltage, while on the other hand the lower end of the last winding 4p, which is grounded via the capacitance of the picture tube, also does not carry any pulse voltage.
  • the tension ratios of these two windings are therefore different from that of the other windings 4b to 4o.
  • the primary winding 3 is preferably wound from stranded wire in order to keep the losses due to the skin effect low.
  • FIG. 2 shows the equivalent circuit diagram belonging to FIG. 1.
  • the capacitor 14, which is essentially formed by the anode coating of the picture tube 15, is connected to the terminal a carrying the high voltage UH.
  • the diode 6b thus corresponds in FIG. 1 to the first diode between the bottom of the chamber Ka and the winding end at the upper end of the chamber Kb.
  • the last diode 6p corresponds to the diode between the lower end of the winding of the chamber Ko and the upper winding end of the last Chamber Kp.
  • the primary winding 3 it is also possible to divide the primary winding 3 into a plurality of sub-windings which are axially adjacent to one another on the core 1 and are connected in parallel between the terminals b and d.
  • the amplitude at the upper layer of the primary winding 3 is different over the axial length. This can be taken into account in that the chambers Ka to Kp are filled correspondingly differently, so that the pulses of the partial windings 4a to 4p each have correspondingly different amplitudes at the bottom of the chamber.
  • the filling factor of the chambers K with the partial windings 4 would then decrease from the left to the right end of the coil formers 7.2 as the amplitude of the pulses at the upper layer of the winding 3 also decreases, in FIG. 1 from +1200 volts to + 1000 volts.

Abstract

In high-voltage transformers, in particular diode split-transformers, it is generally necessary to reduce as much as possible the size of the arrangement as a whole, for cost and weight reasons. The heat losses during operation of such a high-voltage transformer must further be reduced to such an extent that the temperature rise of the transformer does not enter a temperature range in which other parts of the circuitry of a television receiver are damaged or negatively affected. The object of the invention is to reduce losses in a high-voltage transformer, in particular to minimize electric losses. For that purpose, a practically field-free space is arranged between the primary coil and the high-voltage coil of a high-voltage transformer of the above-mentioned type. The invention has applications in television receivers, in particular high-definition receivers of HDTV standard.

Description

Die Erfindung geht aus von einem Hochspannungstransformator gemäß dem Oberbegriff des Anspruchs 1. Ein derartiger Transformator ist bekannt durch die DE-OS 35 14 308. Derartige Transformatoren erzeugen eine Hochspannung für Fernsehempfänger in der Größenordnung von 25 kV.The invention is based on a high-voltage transformer according to the preamble of claim 1. Such a transformer is known from DE-OS 35 14 308. Such transformers generate a high voltage for television receivers in the order of 25 kV.

Bei Fernsehempfängern mit größeren Bildröhren, z.B. mit einem Seitenverhältnis von 16:9 oder einer Bildschirmdiagonale von 85 cm werden höhere Hochspannungen in der Größenordnung von 35 kV benötigt. Transformatoren für eine derartig hohe Hochspannung haben unvermeidbar ein erhöhte Verlustleistung, wodurch die Wärmeentwicklung und die erforderlichen geometrischen Abmessungen zur Abfuhr der Wärme ansteigen.For television receivers with larger picture tubes, e.g. With an aspect ratio of 16: 9 or a screen diagonal of 85 cm, higher high voltages in the order of 35 kV are required. Transformers for such a high voltage inevitably have an increased power loss, as a result of which the heat development and the geometric dimensions required to dissipate the heat increase.

Der Erfindung liegt die Aufgabe zugrunde, bei einem derartigen Hochspannungstransformator die am Transformator auftretende Verlustleistung zu verringern. Diese Aufgabe wird durch die im Anspruch 1 angegebene Erfindung gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.The object of the invention is to reduce the power loss occurring at the transformer in such a high-voltage transformer. This object is achieved by the invention specified in claim 1. Advantageous developments of the invention are specified in the subclaims.

Die Erfindung basiert zunächst auf einer Analyse der bei einem derartigen Transformator insgesamt auftretenden Verlustarten. Eine erste Verlustart besteht in den Ferritverlusten durch Ummagnetisierung des Kerns entsprechend der durch die Hysteresiskurve gebildeten Fläche. Derartige Verluste können nur durch Ferritmaterial erhöhter Qualität verringert werden. Eine zweite Verlustart besteht in Kupferverlusten durch den ohmschen Widerstand des Drahtes und den Skineffekt. Eine dritte Verlustart besteht in den Verlusten in den Hochspannungsgleichrichterdiode, und zwar durch die Flußspannung und den Durchlaßstrom, die Sperrspannung und den Sperrstrom und die Schalterverluste beim Umschalten von dem gesperrten in den leitenden Zustand und umgekehrt. Eine vierte Verlustart besteht in den dielektrischen Verlusten durch Verschiebeströme in dem im allgemein durch ein Vergußharz gebildeten Dielektrikum. Bei den drei ersten Verlustarten sind nach unten hin Grenzen gesetzt insbesondere aus technologischen Gründen und durch die verfügbaren Bauteile. Die Erfindung wendet sich nun der vierten Verlustart zu. Die Erfindung beruht dabei auf folgender Überlegung. Die dielektrischen Verluste treten insbesondere in dem Bereich zwischen der Primärwicklung und der Sekundärwicklung oder Hochspannungswicklung auf, weil hier die größten Spannungsunterschiede bestehen. Wenn es somit gelingt, diesen Bereich weitestgehend elektrisch feldfrei auszubilden, können die dielektrischen Verluste beträchtlich verringert werden. Bei der Erfindung wird dies erreicht lediglich durch eine besonders vorteilhafte Aufteilung der Impulsspannungen an der Primärwicklung und an der Sekundärwicklung, und zwar derart, daß in dem genannten Bereich an der Primärwicklung und an der Sekundärwicklung die Impulse etwa die gleiche Amplitude und Polarität haben. Dann verschwindet praktisch die Differenz in den Impulsspannungen an den beiden Wicklungen, so daß in erwünschter Weise ein elektrisch feldfreier Raum erzielt wird und Verluste durch dielektrische Verschiebeströme weitestgehend vermieden werden. Ein wesentlicher Vorteil besteht darin, daß der feldfreie Raum nicht durch zusätzliche Mittel, sondern nur durch eine geschickte Anordnung der ohnehin benötigten Teile erreicht wird. Durch die Verringerung der dielektrischen Verschiebeströme in dem die Wicklungen umgebenden Dielektrikum wird außerdem der Oberwellengehalt der erzeugten Spannungen verringert. Es kommt dadurch zu weniger Eigenresonanzen, die sonst durch Verschiebeströme ausgelöst werden. Diese Verringerung der Oberwellen bewirkt eine Verbesserung des Innenwiderstandes und außerdem eine Verringerung der am Transformator auftretenden akustischen Geräusche. Insgesamt wird auch das die Wicklungen umgebende Material, vorzugsweise ein Gießharz, weniger belastet.The invention is initially based on an analysis of the total loss types occurring in such a transformer. A first type of loss consists in the ferrite losses due to magnetization of the core in accordance with the area formed by the hysteresis curve. Such losses can only be reduced by ferrite material of higher quality. A second type of loss consists of copper losses due to the ohmic resistance of the wire and the skin effect. A third type of loss is the loss in the high voltage rectifier diode due to the forward voltage and the forward current, the reverse voltage and the reverse current and the switch losses when switching from the blocked to the conductive state and vice versa. A fourth type of loss consists of dielectric losses due to displacement currents in the dielectric generally formed by a potting resin. The first three types of loss have lower limits, particularly for technological reasons and due to the available components. The invention now turns to the fourth type of loss. The invention is based on the following consideration. The dielectric losses occur in particular in the area between the primary winding and the secondary winding or high-voltage winding because the greatest voltage differences exist here. If it is possible to make this area largely electrically free of fields, the dielectric losses can be reduced considerably. In the invention, this is achieved only by a particularly advantageous division of the pulse voltages on the primary winding and on the secondary winding, in such a way that in the area mentioned on the primary winding and on the secondary winding, the pulses have approximately the same amplitude and polarity. Then the difference in the pulse voltages on the two windings practically disappears, so that in the desired manner an electrically field-free space is achieved and losses due to dielectric displacement currents are largely avoided. A major advantage is that the field-free space is not achieved by additional means, but only by a clever arrangement of the parts that are required anyway. The harmonic content of the generated voltages is also reduced by the reduction of the dielectric displacement currents in the dielectric surrounding the windings. This leads to fewer natural resonances that are otherwise triggered by displacement currents. This reduction in harmonics causes an improvement in the internal resistance and also a reduction in the acoustic noises occurring at the transformer. Overall, the material surrounding the windings, preferably a cast resin, is also less stressed.

Die Erfindung wird im folgenden anhand der Zeichnung erläutert. Darin zeigen

Fig. 1
den konstruktiven Aufbau eines erfindungsgemäßen Hochspannungstransformators und
Fig. 2
ein Ersatzschaltbild für den Transformator gemäß Fig. 1.
The invention is explained below with reference to the drawing. Show in it
Fig. 1
the structural design of a high-voltage transformer according to the invention and
Fig. 2
an equivalent circuit diagram for the transformer of FIG. 1.

In der Beschreibung werden im folgenden nur die am Transformator wirksamen Impulsspannungen betrachtet. Die auftretenden Gleichspannungen werden dabei nicht berücksichtigt, weil diese keine dielektrischen Verschiebeströme und somit keine Verlustleistung bewirken.In the description below, only the pulse voltages effective at the transformer are considered. The DC voltages that occur are not taken into account here because they cause no dielectric displacement currents and therefore no power loss.

In Fig. 1 ist auf dem Kern 1 der Spulenkörper 7 gelagert, der die Primärwicklung 3 trägt. Die Primärwicklung 3 besteht aus sechs Lagen. Das Wicklungsende aus der unteren Lage ist an die Klemme b mit der Betriebsspannung +UB angeschlossen. Das Wicklungsende aus der oberen Lage ist an die Klemme d und an den Schalttransistor 13 angeschlossen, der an der Klemme c mit einer zeilenfrequenten Schaltspannung Z gesteuert wird. Die Impulsspannung an der Klemme b ist null. Die Impulsspannung an der Klemme d hat den vollen Wert der Rücklaufspannung von +1200 Volt. Die Impulsspannung nimmt somit von dem Wert null an der Klemme b bis zum Maximalwert an der Klemme d von Windung zu Windung kontinuierlich zu. Das bedeutet, daß die Impulsspannung über die Axiallänge der oberen Lage der Wicklung 3 etwa um 16 % abnimmt und die Impulsspannung am rechten Ende der oberen Lage +1000 Volt beträgt. Die Impulsspannung ist also in der oberen Lage der Wicklung 3 über die Axiallänge des Spulenkörpers 7 weitestgehend konstant und hat einen mittleren Wert von 1100 Volt.In Fig. 1, the bobbin 7 is supported on the core 1, which carries the primary winding 3. The primary winding 3 consists of six layers. The winding end from the lower layer is connected to terminal b with the operating voltage + UB. The winding end from the upper layer is connected to terminal d and to switching transistor 13, which is controlled at terminal c with a line-frequency switching voltage Z. The pulse voltage at terminal b is zero. The pulse voltage at terminal d has the full value of the return voltage of +1200 volts. The pulse voltage thus increases continuously from winding to winding from the value zero at terminal b to the maximum value at terminal d. This means that the pulse voltage over the axial length of the upper layer of the winding 3 decreases by about 16% and the pulse voltage at the right end of the upper layer is +1000 volts. The pulse voltage is therefore largely constant in the upper position of the winding 3 over the axial length of the coil body 7 and has an average value of 1100 volts.

Über dem Spulenkörper 7 mit der Primärwicklung 3 ist der Kammerspulenkörper 2 angeordnet, der insgesamt 16 durch Wände 8 gebildete Kammern Ka bis Kp aufweist, die mit Teilwicklungen 4a bis 4p der Sekundärwicklung oder Hochspannungswicklung 4 gefüllt sind. Das Wicklungsende aus der oberen Lage der ersten Teilwicklung 4a ist mit Erde verbunden. Jeweils das Wicklungsende am Grund einer Kammer K ist mit der Anode einer Hochspannungsgleichrichterdiode 6 verbunden, deren Kathode jeweils mit dem Wicklungsende vom oberen Ende der nächsten Teilwicklung 4 verbunden ist. Das Wicklungsende vom Grund der letzten Teilwicklung 4p in der Klammer Kp bildet die Hochspannungsklemme a. Der Wickelvorgang für die gesamte Sekundärwicklung 4 beginnt am Grund der Kammer Kp. Da jeweils zwischen zwei Kammern eine Diode 6 liegt, sind bei insgesamt 16 Kammern K insgesamt 15 Dioden 6 vorgesehen. An der Klemme a entsteht eine Hochspannung UH von 32 kV. Bei diesen angenommenen Werten ergibt sich jeweils am Grund einer Kammer K ein Impuls von +1100 Volt, der bei allen Kammern gleich groß ist. Am oberen Ende der Wicklung 4 ergibt sich ein Impuls von -1300 Volt.Arranged above the coil former 7 with the primary winding 3 is the chamber coil former 2, which has a total of 16 chambers Ka to Kp formed by walls 8, which are filled with partial windings 4a to 4p of the secondary winding or high-voltage winding 4. The winding end from the upper layer of the first partial winding 4a is connected to earth. In each case the winding end at the bottom of a chamber K is one with the anode High-voltage rectifier diode 6 connected, the cathode of which is connected in each case to the winding end from the upper end of the next partial winding 4. The end of the winding from the bottom of the last partial winding 4p in the bracket Kp forms the high-voltage terminal a. The winding process for the entire secondary winding 4 begins at the bottom of the chamber Kp. Since there is a diode 6 between each two chambers, a total of 15 diodes 6 are provided for a total of 16 chambers K. A high voltage UH of 32 kV develops at terminal a. With these assumed values, there is a pulse of +1100 volts at the bottom of a chamber K, which is the same in all chambers. At the upper end of winding 4 there is a pulse of -1300 volts.

Entlang der oberen Lage der Wicklung 3 stehen somit Impulse mit weitestgehend konstanter Amplitude von +1100 Volt. Andererseits entstehen, wie beschrieben, durch die Hochspannungswicklung 4 in dem der Wicklung 3 zugeordneten Bereich, also im Bereich der unteren Enden der Kammern ebenfalls Impulse mit der konstanten Amplitude von +1100 Volt. Die Impulse an der Wicklung 3 und an der Wicklung 4 sind außerdem zeitgleich. Zwischen den Impulse an der Wicklung 3 und den Impulsen an der Wicklung 4 besteht somit praktisch keine Spannungsdifferenz mehr, so daß sich der durch die strichpunktierte Linie F angedeutete elektrisch feldfreie Raum ergibt.Along the upper layer of winding 3 there are pulses with a largely constant amplitude of +1100 volts. On the other hand, as described, the high-voltage winding 4 also produces pulses with the constant amplitude of +1100 volts in the area assigned to the winding 3, that is to say in the area of the lower ends of the chambers. The pulses on the winding 3 and on the winding 4 are also simultaneous. There is therefore practically no voltage difference between the pulses on the winding 3 and the pulses on the winding 4, so that the electrically field-free space indicated by the dash-dotted line F results.

Die Impulse am oberen Ende der Wicklungen 4 haben zwar die zur Bildung des feldfreien Raumes falsche negative Polarität. Die dort stehenden Impulse sind jedoch von der Primärwicklung 3 soweit entfernt, daß sie keine nennenswerte Verschiebeströme durch daß Dielektrikum mehr bewirken.The pulses at the upper end of the windings 4 have the wrong negative polarity to form the field-free space. However, the pulses there are so far removed from the primary winding 3 that they no longer cause any significant displacement currents through the dielectric.

Das obere Ende der ersten Wicklung 4a ist geerdet und führt somit keine Impulsspannung, während andererseits das untere Ende der letzten Wicklung 4p, das über die Kapazität der Bildröhre geerdet ist, ebenfalls keine Impulsspannung führt. Die Spannungsverhältnisse dieser beiden Wicklungen sind also anders als die der übrigen Wicklungen 4b bis 4o. Um die gewünschten Amplitudenverhältnisse zwischen den Impulsspannungen auch in diesem Bereich herzustellen, ist es vorteilhaft, die Kammern Ka und Kp gegenüber den übrigen Kammern nur halb zu bewickeln. Die Primärwicklung 3 ist vorzugsweise aus Litze gewickelt, um die Verluste durch den Skineffekt gering zu halten.The upper end of the first winding 4a is grounded and therefore carries no pulse voltage, while on the other hand the lower end of the last winding 4p, which is grounded via the capacitance of the picture tube, also does not carry any pulse voltage. The tension ratios of these two windings are therefore different from that of the other windings 4b to 4o. In order to produce the desired amplitude relationships between the pulse voltages in this area as well, it is advantageous to wind the chambers Ka and Kp only half as compared to the other chambers. The primary winding 3 is preferably wound from stranded wire in order to keep the losses due to the skin effect low.

Fig. 2 zeigt das zu Fig. 1 gehörende Ersatzschaltbild. An die die Hochspannung UH führende Klemme a ist der Kondensator 14 angeschlossen, der im wesentlichen durch den Anodenbelag der Bildröhre 15 gebildet wird. Die Diode 6b entspricht somit in Fig. 1 der ersten Diode zwischen dem Grund der Kammer Ka und dem Wicklungsende am oberen Ende der Kammer Kb. Die letzte Diode 6p entspricht der Diode zwischen dem unteren Ende der Wicklung der Kammer Ko und dem oberen Wicklungsende der letzten Kammer Kp.FIG. 2 shows the equivalent circuit diagram belonging to FIG. 1. The capacitor 14, which is essentially formed by the anode coating of the picture tube 15, is connected to the terminal a carrying the high voltage UH. The diode 6b thus corresponds in FIG. 1 to the first diode between the bottom of the chamber Ka and the winding end at the upper end of the chamber Kb. The last diode 6p corresponds to the diode between the lower end of the winding of the chamber Ko and the upper winding end of the last Chamber Kp.

Es ist auch möglich, die Primärwicklung 3 in mehrere Teilwicklungen aufzuteilen, die auf dem Kern 1 in Axialrichtung nebeneinander liegen und parallel zwischen die Klemmen b und d geschaltet sind. Im allgemeinen ist die Amplitude an der oberen Lage der Primärwicklung 3 über die Axiallänge unterschiedlich. Dies kann dadurch berücksichtigt werden, daß die Kammern Ka bis Kp entsprechend unterschiedlich gefüllt sind, so daß auch die Impulse der Teilwicklungen 4a bis 4p jeweils am Grund der Kammer entsprechend unterschiedliche Amplitude haben. Der Füllfaktor der Kammern K mit den Teilwicklungen 4 würde dann vom linken zum rechten Ende der Spulenkörper 7,2 so abnehmen, wie auch die Amplitude der Impulse an der oberen Lage der Wicklung 3 abnimmt, in Fig. 1 also von +1200 Volt auf +1000 Volt.It is also possible to divide the primary winding 3 into a plurality of sub-windings which are axially adjacent to one another on the core 1 and are connected in parallel between the terminals b and d. In general, the amplitude at the upper layer of the primary winding 3 is different over the axial length. This can be taken into account in that the chambers Ka to Kp are filled correspondingly differently, so that the pulses of the partial windings 4a to 4p each have correspondingly different amplitudes at the bottom of the chamber. The filling factor of the chambers K with the partial windings 4 would then decrease from the left to the right end of the coil formers 7.2 as the amplitude of the pulses at the upper layer of the winding 3 also decreases, in FIG. 1 from +1200 volts to + 1000 volts.

Claims (10)

  1. High voltage transformer for a television receiver with a primary winding (3) and a secondary winding (4) arranged above this, the partial windings (4a through 4p) of which are located in cells (K) of a compartment coil former (2) and are connected to each other via diodes (6), characterized in that the primary winding (3) and the secondary winding (4) are sub-divided and polarized in such a way that they produce impulses of roughly equal amplitude and polarity in the regions of the windings (3, 4) adjacent each other, and that a space almost free of electric fields is formed between the windings (3, 4).
  2. Transformer according to claim 1, characterized in that the primary winding (3) is wound in layers with several layers lying above each other and the lead-out wire (b) from the lower layer is provided for connecting to the operating voltage (UB) and the lead-out wire (d) from the upper layer for connecting to a periodic switch (13).
  3. Transformer according to claim 2, characterized in that the partial windings (4a through 4p) are so polarized that there is a positive-directed impulse always at the lead-out wire from the base of each of the cells (K).
  4. Transformer according to claim 3, characterized in that the number of cells (K) and partial windings (4a through 4p) is proportioned sufficiently large so that the positive-directed impulse at the base of a cell (K) has approximately the same amplitude as the positive-directed impulse at the upper layer of the primary winding (3).
  5. Transformer according to claim 1, characterized in that always one diode (6) is connected via its anode to the lead-out wire from the base of a cell (K) and the cathode of each said diode is connected to the lead-out wire from the upper layer of the partial winding (4) of the next cell (K).
  6. Transformer according to claim 1, characterized in that the start of the winding for the secondary winding (4) forms the terminal (a) supplying the high voltage (UH).
  7. Transformer according to claim 1, characterized in that the primary winding (3) consists of several partial windings (3a through 3c) wired in parallel which are arranged adjacent each other in the axial direction of the coil former (2).
  8. Transformer according to claim 1, characterized in that the transformer is constructed as a diode-split transformer.
  9. Transformer according to claim 1, characterized in that the cells (K) are filled differently by the partial windings in such a way that the impulses at the base of each cell have roughly the same amplitude as the impulses at the neighboring winding of the primary winding (3).
  10. Transformer according to claim 1, characterized in that the first (Ka) and the last (Kp) cells are, relative to the other cells (Kb through Ko), only half filled with the partial windings (4).
EP91920765A 1990-12-10 1991-12-03 High-voltage transformer Expired - Lifetime EP0561839B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4039373 1990-12-10
DE4039373A DE4039373A1 (en) 1990-12-10 1990-12-10 HIGH VOLTAGE TRANSFORMER
PCT/EP1991/002285 WO1992010906A1 (en) 1990-12-10 1991-12-03 High-voltage transformer

Publications (2)

Publication Number Publication Date
EP0561839A1 EP0561839A1 (en) 1993-09-29
EP0561839B1 true EP0561839B1 (en) 1997-03-05

Family

ID=6419986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920765A Expired - Lifetime EP0561839B1 (en) 1990-12-10 1991-12-03 High-voltage transformer

Country Status (16)

Country Link
EP (1) EP0561839B1 (en)
JP (1) JP3280965B2 (en)
KR (1) KR100194191B1 (en)
CA (1) CA2098100A1 (en)
DE (2) DE4039373A1 (en)
ES (1) ES2097823T3 (en)
FI (1) FI932627A0 (en)
HK (1) HK1000744A1 (en)
HU (1) HUT64660A (en)
MX (1) MX9102455A (en)
MY (1) MY107209A (en)
PT (1) PT99742B (en)
SG (1) SG46549A1 (en)
TR (1) TR25836A (en)
WO (1) WO1992010906A1 (en)
ZA (1) ZA919724B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ282042B6 (en) * 1991-08-22 1997-04-16 Deutsche Thomson-Brandt Gmbh Diode-separated high-voltage transformer for television receiver
DE4225692A1 (en) * 1992-08-04 1994-02-10 Thomson Brandt Gmbh HV line transformer for TV receiver - has ratio of axial total length of coils to OD of HV coil considerably less than unity
EP0585597B1 (en) * 1992-08-04 1999-05-12 Deutsche Thomson-Brandt Gmbh High voltage line transformer for a TV receiver
DE19510678A1 (en) * 1995-03-27 1996-10-02 Thomson Brandt Gmbh High voltage transformer for a television receiver
FR2783965B1 (en) * 1998-09-30 2000-12-29 Thomson Television Components HIGH VOLTAGE TRANSFORMER
DE19900111A1 (en) 1999-01-05 2000-07-06 Thomson Brandt Gmbh Diode split high voltage transformer
JP5950655B2 (en) * 2012-04-02 2016-07-13 三菱電機株式会社 Flyback transformer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665288A (en) * 1970-09-02 1972-05-23 Zenith Radio Corp Television sweep transformer
NL159223C (en) * 1973-10-10
JPS50109625A (en) * 1974-02-04 1975-08-28
DE3033979A1 (en) * 1980-09-10 1982-04-22 Blaupunkt-Werke Gmbh, 3200 Hildesheim TRANSFORMER
JPS60172319U (en) * 1984-04-21 1985-11-15 株式会社村田製作所 flyback transformer
JPS6374083U (en) * 1986-10-31 1988-05-17
JP2951662B2 (en) * 1987-05-27 1999-09-20 アールシーエー トムソン ライセンシング コーポレイシヨン Video equipment

Also Published As

Publication number Publication date
HUT64660A (en) 1994-01-28
FI932627A (en) 1993-06-09
TR25836A (en) 1993-09-01
SG46549A1 (en) 1998-02-20
ES2097823T3 (en) 1997-04-16
ZA919724B (en) 1993-04-05
KR100194191B1 (en) 1999-06-15
JPH06503448A (en) 1994-04-14
MY107209A (en) 1995-10-31
WO1992010906A1 (en) 1992-06-25
FI932627A0 (en) 1993-06-09
DE59108593D1 (en) 1997-04-10
PT99742A (en) 1993-11-30
HK1000744A1 (en) 1998-04-24
CA2098100A1 (en) 1992-06-10
JP3280965B2 (en) 2002-05-13
KR930703789A (en) 1993-11-30
PT99742B (en) 1999-02-26
EP0561839A1 (en) 1993-09-29
MX9102455A (en) 1992-06-01
DE4039373A1 (en) 1992-06-11
HU9301604D0 (en) 1993-09-28

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