EP0561839A1 - High-voltage transformer. - Google Patents

High-voltage transformer.

Info

Publication number
EP0561839A1
EP0561839A1 EP91920765A EP91920765A EP0561839A1 EP 0561839 A1 EP0561839 A1 EP 0561839A1 EP 91920765 A EP91920765 A EP 91920765A EP 91920765 A EP91920765 A EP 91920765A EP 0561839 A1 EP0561839 A1 EP 0561839A1
Authority
EP
European Patent Office
Prior art keywords
winding
transformer
chamber
transformer according
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91920765A
Other languages
German (de)
French (fr)
Other versions
EP0561839B1 (en
Inventor
Walter Dipl Ing Goseberg
Wolfgang Reichow
Hans-Werner Sander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0561839A1 publication Critical patent/EP0561839A1/en
Application granted granted Critical
Publication of EP0561839B1 publication Critical patent/EP0561839B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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 increased 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 consists in the losses in the high-voltage rectifier diodes, namely through 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 in the dielectric losses due to displacement es currents in the dielectric generally formed by a potting resin.
  • 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 thus possible to make this area largely electrically field-free, the dielectric losses can be considerably reduced. 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 impulse 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 avoided as far as possible.
  • 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 reducing 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 the 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.
  • FIG. 1 shows the structural design of a high-voltage transformer according to the invention and
  • FIG. 2 shows an equivalent circuit diagram for the transformer according to 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 end of the winding 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 the value zero at terminal b to the maximum value at terminal d from winding to winding.
  • the pulse voltage decreases by about 16% over the axial length of the upper layer of winding 3 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 former 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 connected to the anode ner high-voltage rectifier diode 6, 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 size in all chambers. At the upper end of winding 4 there is a pulse of -1300 volts.
  • the high-voltage winding 4 also generates pulses with the constant amplitude of +1200 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 the same. 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 upper end of the first winding 4a is grounded and therefore does not carry any 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, likewise 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 Lit ⁇ ze 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. 1 corresponds 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 partial 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 accordingly differently, so that the pulses of the partial windings 4a to 4p each have 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 position of the winding 3 also decreases, ie in FIG. 1 from +1200 volts to +1000 volts.

Abstract

Dans des transformateurs H.T., notamment des transformateurs divisés à diodes, il est généralement nécessaire de réduire autant que possible les dimensions de l'ensemble du dispositif, pour des raisons de coût et de poids. De même, la déperdition de chaleur pendant le fonctionnement d'un tel transformateur H.T. doit être réduite jusqu'à ce que l'échauffement du transformateur n'atteigne pas une plage de température dans laquelle d'autres parties des circuits d'un poste récepteur de télévision soient endommagées ou affectées. L'objet de l'invention est de réduire les pertes d'un transformateur H.T., notamment de minimiser les pertes électriques. A cet effet, un espace à champ pratiquement nul est créé entre l'enroulement primaire et l'enroulement de haute tension d'un transformateur H.T. du type susmentionné. L'invention s'applique à des postes récepteurs de télévision, notamment des postes récepteurs à haute définition construits selon des normes de télévision de haute définition.In high-voltage transformers, in particular divided diode transformers, it is generally necessary to reduce the dimensions of the whole device as much as possible, for reasons of cost and weight. Likewise, the heat loss during the operation of such an HV transformer must be reduced until the heating of the transformer does not reach a temperature range in which other parts of the circuits of a receiving station are damaged or affected. The object of the invention is to reduce the losses of a high voltage transformer, in particular to minimize the electrical losses. For this purpose, a practically zero field space is created between the primary winding and the high voltage winding of an HV transformer of the aforementioned type. The invention applies to television receiver stations, in particular high definition receiver stations constructed according to high definition television standards.

Description

Hochspan-αungstransformator für einen Fernsehempfänger High-voltage transformer for a television receiver
Die Erfindung geht aus von einem Hochspannungstransformator gemäß dem Oberbegriff des Anspruchs 1. Ein derartiger Trans¬ formator ist bekannt durch die DE-OS 35 14 308. Derartige Transformatoren erzeugen eine Hochspannung für Fernsehempfän¬ ger 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 ei¬ nem 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 geometri¬ schen 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 geometrical dimensions required to dissipate the heat increase.
Der Erfindung liegt die Aufgabe zugrunde, bei einem derarti¬ gen Hochspannungstransformator die am Transformator auftre¬ tende Verlustleistung zu verringern. Diese Aufgabe wird durch die im Anspruch 1 angegebene Erfindung gelöst. Vorteil¬ hafte Weiterbildungen der Erfindung sind i den Unteransprü¬ chen 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 ei¬ nem derartigen Transformator insgesamt auftretenden Verlust¬ arten. 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 wer¬ den. Eine zweite Verlustart besteht in Kupferverlusten durch den ohmschen Widerstand des Drahtes und den Skineffekt. Eine dritte Verlustart besteht in den Verlusten in den Hochspan¬ nungsgleichrichterdioden, 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 Verlust¬ art besteht in den dielektrischen Verlusten durch Verschieb- eströme in dem im allgemein durch ein Vergußharz gebildeten Dielektrikum. Bei den drei ersten Verlustarten sind nach un¬ ten hin Grenzen gesetzt insbesondere aus technologischen Gründen und durch die verfügbaren Bauteile. Die Erfindung wendet sich nun der vierten Verlustart zu. Die Erfindung be¬ ruht dabei auf folgender Überlegung. Die dielektrischen Ver¬ luste treten insbesondere in dem Bereich zwischen der Primär¬ wicklung und der Sekundärwicklung oder Hochspannungswicklung auf, weil hier die größten Spannungsunterschiede bestehen. Wenn es somit gelingt, diesen Bereich weiteεtgehend elek¬ trisch feldfrei auszubilden, können die dielektrischen Verlu¬ ste 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 Impulsspan¬ nungen an den beiden Wicklungen, so daß in erwünschter Weise ein elektrisch feldfreier Raum erzielt wird und Verluste durch dielektrische Verschiebeströme we testgehend vermieden werden. Ein wesentlicher Vorteil besteht darin, daß der feld¬ freie Raum nicht durch zusätzliche Mittel, sondern nur durch eine geschickte Anordnung der ohnehin benötigten Teile er¬ reicht wird. Durch die Verringerung der dielektrischen Ver¬ schiebeströme 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 Verrin¬ gerung der Oberwellen bewirkt eine Verbesserung des Innenwi¬ derstandes und außerdem eine Verringerung der am Transforma¬ tor auftretenden akustischen Geräusche. Insgesamt wird auch das die Wicklungen umgebende Material, vorzugsweise ein Gie߬ harz, 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 increased 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 consists in the losses in the high-voltage rectifier diodes, namely through 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 in the dielectric losses due to displacement es currents in the dielectric generally formed by a potting resin. In the first three types of loss, there are 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 thus possible to make this area largely electrically field-free, the dielectric losses can be considerably reduced. 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 impulse 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 avoided as far as possible. 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 reducing 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 the 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 erläu¬ tert. 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 1 shows the structural design of a high-voltage transformer according to the invention and FIG. 2 shows an equivalent circuit diagram for the transformer according to FIG. 1.
In der Beschreibung werden im folgenden nur die am Transfor¬ mator wirksamen ImpulsSpannungen betrachtet. Die auftreten¬ den 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 gesteu¬ ert wird. Die ImpulsSpannung an der Klemme b ist null. Die ImpulsSpannung an der Klemme d hat den vollen Wert der Rück¬ laufspannung von +1200 Volt. Die ImpulRspannung nimmt somit von dem Wert null an der Klemme b bis zum Maximalwert an der Klemme d von Windung zu Windung kontinuierlich zu. Das bedeu¬ tet, daß die ImpulsSpannung über die Axiallänge der oberen Lage der Wicklung 3 etwa um 16 % abnimmt und die Impulsspan¬ nung 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 kon¬ stant 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 end of the winding 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 the value zero at terminal b to the maximum value at terminal d from winding to winding. This means that the pulse voltage decreases by about 16% over the axial length of the upper layer of winding 3 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 former 7 and has an average value of 1100 volts.
Über dem Spulenkörper 7 mit der Primärwicklung 3 ist der Kam¬ merspulenkörper 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 er¬ sten Teilwicklung 4a ist mit Erde verbunden. Jeweils das Wicklungsende am Grund einer Kammer K ist mit der Anode ei- ner Hochspannungsgleichrichterdiode 6 verbunden, deren Katho¬ de jeweils mit dem Wicklungsende vom oberen Ende der näch¬ sten 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 je¬ weils zwischen zwei Kammern eine Diode 6 liegt, sind bei ins¬ gesamt 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 Kam¬ mer 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 connected to the anode ner high-voltage rectifier diode 6, 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 size 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. Ande¬ rerseits entstehen, wie beschrieben, durch die Hochspannungs¬ wicklung 4 in dem der Wicklung 3 zugeordneten Bereich, also im Bereich der unteren Enden der Kammern ebenfalls Impulse mit der konstanten Amplitude von +1200 Volt. Die Impulse an der Wicklung 3 und an der Wicklung 4 sind außerdem zeit¬ gleich. Zwischen den Impulse an der Wicklung 3 und den Impul¬ sen an der Wicklung 4 besteht somit praktisch keine Span¬ nungsdifferenz mehr, so daß sich der durch die strichpunk¬ tierte 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 generates pulses with the constant amplitude of +1200 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 the same. 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 Wicklunςren 4 haben zwar die zur Bildung des feldfreien Raumes falsche negative Polari¬ tät. Die dort stehenden Impulse sind jedoch von der Primär¬ wicklung 3 soweit entfernt, daß sie keine nennenswerte Ver¬ schiebeströme durch daß Dielektrikum mehr bewirken.The impulses at the upper end of the Wicklunςren 4 admittedly 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 appreciable 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 ge¬ wünschten Amplitudenverhältnisse zwischen den Impulsspannun¬ gen 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 Lit¬ ze gewickelt, um die Verluste durch den Skineffekt gering zu halten.The upper end of the first winding 4a is grounded and therefore does not carry any 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, likewise 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 Lit¬ ze 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 Kondensa¬ tor 14 angeschlossen, der im wesentlichen durch den Anodenbe¬ lag der Bildröhre 15 gebildet wird. Die Diode 6b entspricht somit in Fig. 1 der ersten Diode zwischen dem Grund der Kam¬ mer Ka und dem Wicklungsende am oberen Ende der Kammer Kb. Die letzte Diode 6p entspricht der Diode zwischen dem unte¬ ren Ende der Wicklung der Kammer Ko und dem oberen Wicklungs¬ ende 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. 1 corresponds 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 Teil¬ wicklungen aufzuteilen, die auf dem Kern 1 in Axialrichtung nebeneinander liegen und parallel zwischen die Klemmen b vind d geschaltet sind. Im allgemeinen ist die Amplitude an der oberen Lage der Primärwicklung 3 über die Axiallänge unter¬ schiedlich. 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 mterschiedliche 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 obe¬ ren 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 partial 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 accordingly differently, so that the pulses of the partial windings 4a to 4p each have 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 position of the winding 3 also decreases, ie in FIG. 1 from +1200 volts to +1000 volts.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Hochspannungstransformator für einen Fernsehempfänger mit einer Primärwicklung (3) und einer darüber angeord¬ neten Sekundärwicklung (4), deren Teilwicklungen (4a - 4p) in Kammern (K) eines Kammerspulenkörpers (2) liegen und über Dioden (6) miteinander verbunden sind, dadurch gekennzeichnet, daß die Primärwicklung (3) und die Se¬ kundärwicklung (4) derart aufgeteilt und gepolt sind, daß sich in den einander zugewandten Bereichen der Wick¬ lungen (3, 4) Impulse etwa gleicher Amplitude und Pola¬ rität ergeben und zwischen den Wicklungen (3, 4) ein elektrisch nahezu feldfreier Raum gebildet ist.1. High-voltage transformer for a television receiver with a primary winding (3) and a secondary winding (4) arranged above it, the partial windings (4a - 4p) of which are located in chambers (K) of a chamber bobbin (2) and are connected to one another via diodes (6) , characterized in that the primary winding (3) and the secondary winding (4) are divided and polarized such that pulses of approximately the same amplitude and polarity result in the mutually facing regions of the windings (3, 4) and an electrically almost field-free space is formed between the windings (3, 4).
2. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß die Primärwicklung (3) als Lagenwicklung mit mehre¬ ren übereinander liegenden Lagen ausgebildet und das Wicklungsende (b) aus der unteren Lage zum Anschluß an die Betriebsspannung (ÜB) und das Wicklungsende (d) aus der oberen Lage zum Anschluß an einen periodischen Schalter (13) vorgesehen ist.2. Transformer according to claim 1, characterized in that the primary winding (3) is formed as a layer winding with several layers lying one above the other and the winding end (b) from the lower layer for connection to the operating voltage (ÜB) and the winding end (d) from the upper position for connection to a periodic switch (13) is provided.
3. Transformator nach Anspruch 2, dadurch gekennzeichnet, daß die Teilwicklungen (4a - 4p) so gepolt sind, daß jeweils am Wicklungsende am Grund einer Kammer (K) ein positiv gerichtetet Impuls liegt.3. Transformer according to claim 2, characterized in that the partial windings (4a - 4p) are poled so that there is a positively directed pulse at the end of the winding at the bottom of a chamber (K).
4. Transformator nach Anspruch 3, dadurch gekennzeichnet, daß die Zahl der Kammern (K) und Teilwicklungen (4a - 4p) so groß bemessen ist, daß der positiv gerichtete Impuls am Grund einer Kammer (K) etwa die gleiche Ampli¬ tude hat wie der positiv gerichtete Impuls an der obe¬ ren Lage der Primärwicklung (3).4. Transformer according to claim 3, characterized in that the number of chambers (K) and partial windings (4a - 4p) is dimensioned so large that the positive directional pulse at the bottom of a chamber (K) has approximately the same amplitude as the positively directed pulse on the upper position of the primary winding (3).
5. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß jeweils eine Diode (6) mit ihrer Anode an das Wick- lungsende vom Grund einer Kammer (K) und mit ihrer Ka¬ thode an das Wicklungsende aus der oberen Lage der Teil¬ wicklung (4) der nächsten Kammer (K) angeschlossen ist.5. Transformer according to claim 1, characterized in that in each case a diode (6) with its anode to the winding end of the chamber from the bottom of a chamber (K) and with its cathode to the end of the winding from the upper layer of the partial winding (4) of the next chamber (K).
6. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß der Wickelanfang der Sekundärwicklung (4) die die Hochspannung (UH) liefernde Klemme (a) bildet.6. Transformer according to claim 1, characterized in that the winding start of the secondary winding (4) forms the high voltage (UH) supplying terminal (a).
7. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß die Primärwicklung (3) aus mehreren parallel ge¬ schalteten Teilwicklungen (3a - 3c) besteht, die in Axi¬ alrichtung des Spulenkörpers (2) nebeneinander liegen.7. Transformer according to claim 1, characterized in that the primary winding (3) consists of a plurality of parallel ge-connected partial windings (3a - 3c), which lie side by side in the axial direction of the coil former (2).
8. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß der Transformator als Dioden-Split-Transformator ausgebildet ist.8. Transformer according to claim 1, characterized in that the transformer is designed as a diode split transformer.
9. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß die Kammern (K) derart unterschiedlich mit den Teil¬ wicklungen gefüllt sind, daß jeweils der Impuls am Grund der Kammer etwa die gleiche Amplitude hat wie der Impuls an der benachbarten Windung der Primärwicklung (3)9. Transformer according to claim 1, characterized in that the chambers (K) are filled so differently with the partial windings that the pulse at the bottom of the chamber has approximately the same amplitude as the pulse on the adjacent winding of the primary winding (3rd )
10. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß die erste (Ka) und letzte (Kp) Kammer durch die Teilwicklungen (4) relativ zu den übrigen Kammern (Kb - Ko) nur halb gefüllt sind. 10. Transformer according to claim 1, characterized in that the first (Ka) and last (Kp) chamber are only half filled by the partial windings (4) relative to the other chambers (Kb - Ko).
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 true EP0561839A1 (en) 1993-09-29
EP0561839B1 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
KR100235814B1 (en) * 1991-08-22 1999-12-15 루엘랑 브리지뜨 Diode split high voltage transformer for a television receiver
EP0585597B1 (en) * 1992-08-04 1999-05-12 Deutsche Thomson-Brandt Gmbh High voltage line transformer for a TV 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
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

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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
DE3817892C2 (en) * 1987-05-27 1998-01-29 Rca Licensing Corp High voltage transformer

Non-Patent Citations (1)

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Title
See references of WO9210906A1 *

Also Published As

Publication number Publication date
KR100194191B1 (en) 1999-06-15
TR25836A (en) 1993-09-01
DE4039373A1 (en) 1992-06-11
ES2097823T3 (en) 1997-04-16
HK1000744A1 (en) 1998-04-24
FI932627A (en) 1993-06-09
MY107209A (en) 1995-10-31
HU9301604D0 (en) 1993-09-28
DE59108593D1 (en) 1997-04-10
JPH06503448A (en) 1994-04-14
CA2098100A1 (en) 1992-06-10
SG46549A1 (en) 1998-02-20
JP3280965B2 (en) 2002-05-13
FI932627A0 (en) 1993-06-09
PT99742B (en) 1999-02-26
ZA919724B (en) 1993-04-05
HUT64660A (en) 1994-01-28
PT99742A (en) 1993-11-30
MX9102455A (en) 1992-06-01
WO1992010906A1 (en) 1992-06-25
EP0561839B1 (en) 1997-03-05
KR930703789A (en) 1993-11-30

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