EP0039485B1 - Line transformer for a television receiver - Google Patents

Line transformer for a television receiver Download PDF

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Publication number
EP0039485B1
EP0039485B1 EP81103263A EP81103263A EP0039485B1 EP 0039485 B1 EP0039485 B1 EP 0039485B1 EP 81103263 A EP81103263 A EP 81103263A EP 81103263 A EP81103263 A EP 81103263A EP 0039485 B1 EP0039485 B1 EP 0039485B1
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EP
European Patent Office
Prior art keywords
air gap
core
transformer according
core parts
cross
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Expired
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EP81103263A
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German (de)
French (fr)
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EP0039485A1 (en
Inventor
Walter Dipl.-Ing. Goseberg
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Deutsche Thomson oHG
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Licentia Patent Verwaltungs GmbH
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Priority to AT81103263T priority Critical patent/ATE8186T1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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

Definitions

  • a line transformer for a television receiver generally contains a primary winding, a secondary winding which supplies the high voltage and a core which has an air gap in one core leg or in both core legs. This air gap is generally formed by a plastic film inserted between two core parts.
  • the line transformer supplies the line deflection current for the deflection coils of the picture tube and the high voltage for the picture tube via a high-voltage rectifier.
  • the high-voltage source thus formed has an internal resistance in the order of 2-3 MQ. This internal resistance of the high-voltage source is undesirable since the high voltage decreases as the beam current increases.
  • Circuits are known which stabilize the high voltage against beam current changes. However, these circuits are generally relatively complex and require a large number of active and passive components.
  • the internal resistance of the high-voltage source is essentially disruptive at higher beam currents, it would be advantageous if the internal resistance decreased with increasing beam current: However, this cannot be achieved easily. Rather, the internal resistance of the high-voltage source is generally approximately constant, depending on the beam current. This applies at least from 100-150 ⁇ A beam current.
  • the invention has for its object to design the line transformer without the use of additional components so that the internal resistance of the high voltage source decreases with increasing beam current.
  • transformers (DE-C-733 783) to provide air gaps, the width of which changes over the cross section of the core legs.
  • this solution is not based on the task of reducing the internal resistance of the high-voltage source with increasing beam current in a line transformer. Rather, a flattened current-voltage characteristic curve is to be achieved there by special design of the air gap in order, for. B. to avoid damage to a relay in the event of short circuits.
  • the essential feature of the invention is missing that the two core parts meet directly over part of their cross-section without an air gap and thus an insulating film forming the air gap can be completely dispensed with.
  • the advantageous mode of operation of the solution according to the invention can be explained as follows.
  • a low beam current that is to say a low direct current through the primary winding
  • the premagnetization of the core is small. Therefore, only a small area of the core cross section is saturated.
  • a small air gap is effective, starting from zero towards small values.
  • the core's magnetization also increases, so that a larger area of the core cross-section is saturated.
  • the magnetically effective air gap volume is increased in a desired manner.
  • increasing the air gap volume reduces the effective inductance and thus the return length in the deflection circuit.
  • reduced return means increasing high voltage.
  • the magnetically effective air gap volume is thus dependent on the jet current by the air gap designed according to the invention and adapts itself in a desired manner to the respectively effective jet current in such a way that the decrease in the high voltage is counteracted by shortening the return flow. This in turn means a reduction in the internal resistance.
  • FIG. 1 shows the core 1 of a line transformer, which is composed of two U-shaped core parts 2, 3.
  • the primary winding 5 and the high-voltage winding 6 are located on the core leg 4.
  • the two core parts 2, 3 abut one another directly without forming an air gap.
  • the two core parts 2, 3 meet on the inner edge without forming an air gap.
  • the core part 3 is chamfered at its front end, so that there is a wedge-shaped air gap 8. Its width increases linearly from zero to d.
  • the value d can be on the order of 0.25 to 1.0 mm.
  • This wedge-shaped air gap 8 brings about the described advantageous properties of the line transformer, i. H. in particular the reduction of the internal resistance of the high voltage source with increasing beam current.
  • This solution has the advantage that a perfect support of the core parts 2, 3 is ensured and an extremely sharp edge is avoided at the support point, which can easily lead to core parts breaking out.
  • the width of the air gap 8 increases in a wedge shape up to the final value d.
  • This solution has the advantage that only the core part 3 needs to be ground at an angle, while the front end of the core part 2 closes vertically and evenly, as in known cores.
  • FIGS. 2a and 2b shows a combination of the solutions according to FIGS. 2a and 2b.
  • 2d shows a further embodiment in which the two core parts 2, 3 are identical.
  • the opening angle a of the gap 8 is on the order of 10 to 14 °.
  • the end of the core section 3 having a rectangular cross section has two rectangular, flat surfaces 14, 15 on two opposite edges, on which the core part 2, not shown, rests directly without an air gap, similar to that in FIG. 2c.
  • the end of the core part 3 is formed into a concave surface 16, which forms a section from a cylindrical surface. This also forms an air gap with a width that changes over the cross section.
  • the width a of the surfaces 14, 15 is of the order of 1 mm and the radius of curvature r of the surface 16 is of the order of 20-30 mm.
  • the lower end of the attached core part 2 can then be flat as in FIG. 2a. This has the advantage that the core part 2 is easier to manufacture.
  • the front end of the core part 2 can also have a concave surface 16 like that of the core part 3. This has the advantage that then both core parts 2, 3 are identical and thus only one core part of a single type has to be manufactured.
  • Fig. 3 shows the deformation of a horizontal white bar in the reproduced image if the internal resistance of the high voltage source is too high.
  • the fully drawn white bar 9 is in the upper half of the picture and extends z. B. over 20 to 30 lines. It is assumed that the maximum beam current for the white bar 9 is of the order of 3000 to 5000 ⁇ A. Since the white bar 9 extends over a large number of lines, the smoothing capacitor for the high voltage, which is of the order of 1000 to 2500 pF, cannot maintain the high voltage for such a long time that the high voltage during the display of the white bar 9, i.e. from top to bottom in direction 10, decreases.
  • a reduced high voltage causes an increase in the sensitivity to deflection because the electric radiation passes through the deflection field at a lower speed. This will make the. effective horizontal deflection amplitude, ie the image width is increased.
  • the sensitivity to deflection in the vertical direction is also increased, so that the vertical deflection in the lower region of the white bar 9 becomes too great.
  • Curve 12 shows this dependency for a known line transformer which is tuned to the 9th harmonic of the return frequency of the return vibration and has an air gap of constant width. It can be seen that the internal resistance of the high voltage source, ie the slope of curve 12, is approximately constant. This internal resistance has a disadvantageous effect, in particular in the case of high beam current, in the manner described.
  • Curve 13 shows the dependence of the high voltage on the beam current when using the invention. It can be seen that at the same high voltage at zero beam current, the high voltage drops significantly less with increasing beam current and that, in addition, the internal resistance of the high voltage source, namely the slope of the curve with increasing beam current, decreases in a desired manner. The dependency of the high voltage on the beam current is thus reduced, in particular in the case of high beam currents> 1000 ⁇ A, compared to curve 12. This reduces, among other things, the errors in the display on the screen explained with reference to FIG. 3.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Details Of Television Scanning (AREA)

Abstract

1. Line transformer for a television receiver having a primary winding bracket (5), a secondary winding (6) and two core parts (2, 3) which are placed together to provide an air gap, characterized in that the core parts (2, 3) are directly in contact, without air gap, over a limited part of their cross section and that an air gap (8), having a width which varies over the cross section, is provided over the remaining cross section.

Description

Ein Zeilentransformator für einen Fernsehempfänger enthält im allgemeinen eine Primärwicklung, eine die Hochspannung liefernde Sekundärwicklung und einen Kern, der in einem Kernschenkel oder in beiden Kernschenkeln einen Luftspalt aufweist. Dieser Luftspalt wird im allgemeinen durch eine zwischen zwei Kernteilen eingelegte Kunststoffolie gebildet. Der Zeilentransformator liefert einerseits den Zeilenablenkstrom für die Abienkspulen der Bildröhre und andererseits über einen Hochspannungsgleichrichter die Hochspannung für die Bildröhre. Die so gebildete Hochspannungsquelle hat dabei einen Innenwiderstand in der Größenordnung von 2-3 MQ. Dieser Innenwiderstand der Hochspannungsquelle ist unerwünscht, da dadurch mit steigendem Strahlstrom die Hochspannung abnimmt.A line transformer for a television receiver generally contains a primary winding, a secondary winding which supplies the high voltage and a core which has an air gap in one core leg or in both core legs. This air gap is generally formed by a plastic film inserted between two core parts. The line transformer supplies the line deflection current for the deflection coils of the picture tube and the high voltage for the picture tube via a high-voltage rectifier. The high-voltage source thus formed has an internal resistance in the order of 2-3 MQ. This internal resistance of the high-voltage source is undesirable since the high voltage decreases as the beam current increases.

Diese Abnahme der Hochspannung hat u. a. folgende Auswirkung. Wenn die Strahlstrom ansteigt und die Hochspannung durch die erhöhte Belastung abnimmt, wird die Ablenkempfindlichkeit wegen der geringeren Geschwindigkeit des Elektronenstrahls im Ablenkfeld größer, so daß in unerwünschter Weise bei steigendem Strahlstrom die Bildbreite zunimmt.This decrease in high voltage has u. a. following impact. If the beam current increases and the high voltage decreases due to the increased load, the deflection sensitivity becomes greater because of the lower speed of the electron beam in the deflection field, so that the image width increases undesirably as the beam current increases.

Zur Verringerung dieser Wirkung ist es bekannt, in den Weg des Betriebsstromes zur Zeilenendstufe einen Vorwiderstand einzuschalten. Dieser wirkt folgendermaßen. Wenn der Strahlstrom zunimmt, die Hochspannung absinkt und die Bildbreite unerwünscht zunimmt, steigt auch die Stromaufnahme der Zeilenendstufe an. Dadurch wird der Spannungsabfall über dem genannten Vorwiderstand erhöht und somit die an der Zeilenendstufe wirksame Betriebsspannung verringert. Diese Verringerung der Betriebsspannung bewirkt eine Verringerung der Ablenkamplitude und wirkt somit der genannten Vergrößerung der Bildbreite entgegen. Da über den genannten Vorwiderstand jedoch der gesamte Betriebsgleichstrom der Zeilenendstufe fließt, entsteht eine unerwünschte Verlustleistung, so daß dieser Widerstand für eine relativ hohe Leistung bemessen sein muß und daher auch relativ teuer ist. Man ist daher bemüht, diesen Widerstand einzusparen.To reduce this effect, it is known to switch a series resistor in the path of the operating current to the line output stage. This works as follows. If the beam current increases, the high voltage drops and the image width increases undesirably, the current consumption of the line output stage also increases. This increases the voltage drop across the series resistor mentioned and thus reduces the operating voltage effective at the line output stage. This reduction in the operating voltage brings about a reduction in the deflection amplitude and thus counteracts the aforementioned enlargement of the image width. However, since the entire operating direct current of the line output stage flows through the series resistor, an undesired power loss arises, so that this resistor must be dimensioned for a relatively high power and is therefore also relatively expensive. One tries therefore to save this resistance.

Es sind zwar Schaltungen bekannt, die die Hochspannung gegen;Strahlstromänderung stabilisieren. Diese Schaltungen sind aber im allgemeinen relativ aufwandreich und erfordern eine Vielzahl von aktiven und passiven Bauteilen.Circuits are known which stabilize the high voltage against beam current changes. However, these circuits are generally relatively complex and require a large number of active and passive components.

Da der Innenwiderstand der Hochspannungsquelle im wesentlichen bei höheren Strahlströmen störend in Erscheinung tritt, wäre es vorteilhaft, wenn der Innenwiderstand mit steigendem Strahlstrom abnimmt: Dieses ist jedoch ohne weiteres nicht zu erreichen. Vielmehr ist im allgemeinen der Innenwiderstand der Hochspannungsquelle in Abhängigkeit vom Strahlstrom etwa konstant. Das gilt zumindest ab 100-150 µA Strahlstrom.Since the internal resistance of the high-voltage source is essentially disruptive at higher beam currents, it would be advantageous if the internal resistance decreased with increasing beam current: However, this cannot be achieved easily. Rather, the internal resistance of the high-voltage source is generally approximately constant, depending on the beam current. This applies at least from 100-150 µA beam current.

Der Erfindung liegt die Aufgabe zugrunde, ohne Einsatz zusätzlicher Bauteile den Zeilentransformator so auszubilden, daß der Innenwiderstand der Hochspannungsquelle mit steigendem Strahlstrom abnimmt.The invention has for its object to design the line transformer without the use of additional components so that the internal resistance of the high voltage source decreases with increasing beam current.

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

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

Es ist zwar allgemein bei Transformatoren bekannt (DE-C-733 783), Luftspalte vorzusehen, deren Weite sich über dem Querschnitt der Kernschenkel ändert. Dieser Lösung liegt jedoch nicht die Aufgabe zugrunde, bei einem Zeilentransformator den Innenwiderstand der Hochspannungsquelle bei steigendem Strahlstrom zu verringern. Vielmehr soll dort durch besondere Ausbildung des Luftspaltes eine abgeflachte Strom-Spannungskennlinie erreicht werden, um z. B. bei Kurzschlüssen eine Beschädigung eines Relais zu vermeiden. Außerdem fehlt das für die Erfindung wesentliche Merkmal, daß die beiden Kernteile über einen Teil ihres Querschnittes unmittelbar ohne Luftspalt aufeinanderstoßen und somit auf eine den Luftspalt bildende Isolierfolie völlig verzichtet werden kann.It is generally known for transformers (DE-C-733 783) to provide air gaps, the width of which changes over the cross section of the core legs. However, this solution is not based on the task of reducing the internal resistance of the high-voltage source with increasing beam current in a line transformer. Rather, a flattened current-voltage characteristic curve is to be achieved there by special design of the air gap in order, for. B. to avoid damage to a relay in the event of short circuits. In addition, the essential feature of the invention is missing that the two core parts meet directly over part of their cross-section without an air gap and thus an insulating film forming the air gap can be completely dispensed with.

Die vorteilhafte Wirkungsweise der erfindungsgemäßen Lösung läßt sich folgendermaßen erklären. Bei einem geringen Strahlstrom, also einem geringen Gleichstrom durch die Primärwicklung, ist die Vormagnetisierung des Kernes klein. Daher ist nur ein geringer Bereich des Kern-Querschnittes gesättigt. Für diesen geringen Bereich des Kern-Querschnittes ist ein kleiner Luftspalt, von Null beginnend zu kleinen Werten hin, wirksam. Bei steigendem Strahlstrom steigt auch die Vormagnetisierung des Kernes an, so daß nun ein größerer Bereich des Kern-Querschnittes in Sättigung gerät. Dadurch wird das magnetisch wirksame Luftspalt-Volumen in erwünschter Weise erhöht. Eine Erhöhung des Luftspaltvolumens verringert aber die wirksame Induktivität und damit die Rücklauflänge im Ablenkkreis. Verringerter Rücklauf bedeutet aber ansteigende Hochspannung. Das magnetisch wirksame Luftspalt-Volumen wird also durch den erfindungsgemäß ausgebildeten Luftspalt in erwünschter Weise vom Strahlstrom abhängig und paßt sich in erwünschter Weise dem jeweils wirksamen Strahlstrom in der Weise an, daß durch Rücklaufverkürzung der Abnahme der Hochspannung entgegengewirkt wird. Das wiederum bedeutet eine Verringerung des Innenwiderstandes.The advantageous mode of operation of the solution according to the invention can be explained as follows. With a low beam current, that is to say a low direct current through the primary winding, the premagnetization of the core is small. Therefore, only a small area of the core cross section is saturated. For this small area of the core cross-section, a small air gap is effective, starting from zero towards small values. As the beam current increases, the core's magnetization also increases, so that a larger area of the core cross-section is saturated. As a result, the magnetically effective air gap volume is increased in a desired manner. However, increasing the air gap volume reduces the effective inductance and thus the return length in the deflection circuit. However, reduced return means increasing high voltage. The magnetically effective air gap volume is thus dependent on the jet current by the air gap designed according to the invention and adapts itself in a desired manner to the respectively effective jet current in such a way that the decrease in the high voltage is counteracted by shortening the return flow. This in turn means a reduction in the internal resistance.

Durch die erfindungsgemäße Lösung werden in überraschender Weise mehrere Vorteile erzielt.

  • a) Der bisher im Weg des Betriebsstromes zur Zeilenendstufe vorgesehene Widerstand zur Kompensation der strahlstromabhängigen Bildbreite kann kleiner und damit billiger werden oder sogar vollständig entfallen. Dadurch wird die dort auftretende Verlustleistung verringert.
  • b) Bisher wurden zur Realisierung eines definierten Luftspaltes konstanter Weise Isoliereinlagen verwendet, die zwischen die beiden Kernschenkel eingeklebt wurden. Da bei der erfindungsgemäßen Lösung der Luftspalt an einer Stelle Null sein kann, die beiden Kernschenkel also direkt aufeinanderstoßen können, können derartige Einlagen vollständig entfallen. Dadurch ergibt sich insbesondere ein Vorteil bei der Fertigung, weil die Handhabungen zum Einlegen der Zwischenlagen und zum Festkleben derselben entfallen.
  • c) Dadurch, daß ein echter Luftspalt vorliegt, der nicht durch eine Zwischenlage gebildet ist, kann dieser Luftspalt mit einem Klebstoff wie z. B. Araldith vollständig ausgefüllt werden. Dadurch ergibt sich eine gute Möglichkeit zur Verklebung der beiden Kernteile. Außerdem wird dadurch die Neigung des Trafos zur Funkenbildung im Luftspalt durch unterschiedliche Aufladung der beiden Kernteile beim Prüfen beträchtlich herabgesetzt.
  • d) Durch die Verringerung des Innenwiderstandes der Hochspannungsquelle wird im Sinne der Aufgabenstellung ein sehr gutes Verhalten des Strahlstromes bei waagerechten Weißbalken erreicht, wie anhand der Beschreibung näher erläutert wird.
The solution according to the invention surprisingly achieves several advantages.
  • a) The resistance previously provided in the path of the operating current to the line output stage for compensating the beam current-dependent image width can become smaller and thus cheaper or even be completely eliminated. This will result in the loss occurring there performance reduced.
  • b) Insulating inserts that have been glued between the two core legs have been used consistently to realize a defined air gap. Since in the solution according to the invention the air gap can be zero at one point, that is to say the two core limbs can meet directly, such deposits can be dispensed with entirely. This results in particular in an advantage in production, because the manipulations for inserting the intermediate layers and for sticking them are eliminated.
  • c) Because there is a real air gap that is not formed by an intermediate layer, this air gap can be sealed with an adhesive such as. B. Araldith must be filled in completely. This results in a good possibility for gluing the two core parts. In addition, the tendency of the transformer to form sparks in the air gap is considerably reduced by different charging of the two core parts during testing.
  • d) By reducing the internal resistance of the high-voltage source, a very good behavior of the beam current is achieved with horizontal white bars in the sense of the task, as will be explained in more detail with reference to the description.

Die Erfindung wird im folgenden anhand der Zeichnung an verschiedenen Ausführungsbeispielen erläutert. Darin zeigt

  • Fig. 1 im Prinzip den erfindungsgemäßen Zeilentrafo,
  • Fig. 2 verschiedene Ausbildungen des Luftspaltes,
  • Fig. 3 die bei einem zu hohen Innenwiderstand auftretende Störung bei einem Weißbalken und
  • Fig. 4 Meßkurven zur Erläuterung der erzielten Verringerung des Innenwiderstandes bei hohem Strahlstrom.
The invention is explained below with reference to the drawing using various exemplary embodiments. It shows
  • 1 in principle the line transformer according to the invention,
  • 2 different designs of the air gap,
  • Fig. 3 shows the disturbance with a white bar when the internal resistance is too high
  • Fig. 4 measurement curves to explain the reduction in internal resistance achieved at high beam current.

Fig. 1 zeigt von einem Zeilentransformator den Kern 1, der aus zwei U-förmigen Kernteilen 2, 3 zusammengesetzt ist. Auf dem Kernschenkel 4 befinden sich die Primärwicklung 5 und die Hochspannungswicklung 6. Unter der Primärwicklung 5 stoßen die beiden Kernteile 2, 3 unmittelbar ohne Bildung eines Luftspaltes aufeinander. Das hat den Vorteil, daß hier in erwünschter Weise eine besonders feste Kopplung zwischen den Wicklungen 5, 6 erzielt wird und auch keine Zwischenlage zur Bildung eines Luftspaltes benötigt wird. In dem gegenüberliegenden Kernschenkel 7 stoßen die beiden Kernteile 2, 3 am Innenrand auch ohne Bildung eines Luftspaltes aufeinander. Der Kernteil 3 ist jedoch an seinem Stirnende abgeschrägt, so daß sich dort ein keilförmiger Luftspalt 8 ergibt. Dessen Weite nimmt vom Wert Null linear bis zum Wert d zu. Der Wert d kann in der Größenordnung von 0,25 bis 1,0 mm liegen. Dieser keilförmige Luftspalt 8 bewirkt die beschriebenen vorteilhaften Eigenschaften des Zeilentrafos, d. h. insbesondere die Verringerung des Innenwiderstandes der Hochspannungsquelle bei steigendem Strahlstrom.1 shows the core 1 of a line transformer, which is composed of two U-shaped core parts 2, 3. The primary winding 5 and the high-voltage winding 6 are located on the core leg 4. Under the primary winding 5, the two core parts 2, 3 abut one another directly without forming an air gap. This has the advantage that a particularly firm coupling between the windings 5, 6 is achieved in the desired manner and no intermediate layer is required to form an air gap. In the opposite core leg 7, the two core parts 2, 3 meet on the inner edge without forming an air gap. However, the core part 3 is chamfered at its front end, so that there is a wedge-shaped air gap 8. Its width increases linearly from zero to d. The value d can be on the order of 0.25 to 1.0 mm. This wedge-shaped air gap 8 brings about the described advantageous properties of the line transformer, i. H. in particular the reduction of the internal resistance of the high voltage source with increasing beam current.

In Fig. 2a liegen die beiden im Querschnitt rechteckigen Kernteile 2, 3 über den quaderförmigen Bereich der Breite a unmittelbar ohne Luftspalt aufeinander. Diese Lösung hat den Vorteil, daß eine einwandfreie Auflage der Kernteile 2, 3 gewährleistet und an der Auflagestelle eine extrem scharfe Kante vermieden wird, die leicht zu einem Ausbrechen von Kernteilen führen kann. Zum rechten Ende hin nimmt die Weite des Luftspaltes 8 keilförmig bis auf den Endwert d hin zu. Diese Lösung hat den Vorteil, daß nur der Kernteil 3 schräg geschliffen zu werden braucht, während das Stirnende des Kernteils 2 wie bei bekannten Kernen senkrecht und eben abschließt.In Fig. 2a, the two core parts 2, 3, which are rectangular in cross-section, lie directly on top of one another without an air gap over the cuboid area of width a. This solution has the advantage that a perfect support of the core parts 2, 3 is ensured and an extremely sharp edge is avoided at the support point, which can easily lead to core parts breaking out. Towards the right end, the width of the air gap 8 increases in a wedge shape up to the final value d. This solution has the advantage that only the core part 3 needs to be ground at an angle, while the front end of the core part 2 closes vertically and evenly, as in known cores.

In Fig. 2b stoßen die Kernteile 2, 3 am linken Ende wieder direkt aufeinander. Die beiden Stirnenden sind jedoch gleichmäßig schräg geschliffen, so daß am rechten Ende wieder der Luftspalt mit der maximalen Weite d entsteht. Diese Lösung hat den Vorteil, daß beide Kernteile 2, 3 identisch sind und somit insgesamt nur ein Teil hergestellt und auf Lager gehalten zu werden braucht. Bei einem kleinen Strahlstrom, also einem geringen Gleichstrom durch die Primärwicklung, ist die Vormagnetisierung des Kernes klein. Daher ist nur ein geringer Bereich des Kern-Querschnittes gesättigt. Dieser Bereich ist durch die schraffierten Kernteile 17 angedeutet. Diese Wirkung liegt auch bei den anderen Ausführungsbeispielen vor.In Fig. 2b, the core parts 2, 3 meet again directly at the left end. However, the two ends are ground at an even angle so that the air gap with the maximum width d is created again at the right end. This solution has the advantage that both core parts 2, 3 are identical and therefore only a part needs to be manufactured and kept in stock. With a small beam current, that is to say a low direct current through the primary winding, the premagnetization of the core is small. Therefore, only a small area of the core cross section is saturated. This area is indicated by the hatched core parts 17. This effect is also present in the other exemplary embodiments.

Fig. 2c zeigt eine Kombination der Lösungen gemäß Fig. 2a und 2b.2c shows a combination of the solutions according to FIGS. 2a and 2b.

Fig. 2d zeigt eine weitere Ausführungsform, bei der die beiden Kernteile 2, 3 identisch sind. Der Öffnungswinkel a des Spaltes 8 liegt in der Größenordnung von 10 bis 14°.2d shows a further embodiment in which the two core parts 2, 3 are identical. The opening angle a of the gap 8 is on the order of 10 to 14 °.

In Fig. 2e hat das Ende des Rechteckquerschnitt aufweisenden Kernteils 3 an zwei gegenüberliegenden Kanten zwei rechteckförmige, ebene Flächen 14, 15, an denen der nicht dargestellte Kernteil 2 ohne Luftspalt direkt aufliegt, ähnlich wie in Fig. 2c. Zwischen den Flächen 14, 15 ist das Ende des Kernteils 3 zu einer konkaven Fläche 16 ausgebildet, die einen Ausschnitt aus einer Zylindermantelfläche bildet. Dadurch wird ebenfalls ein Luftspalt mit sich über dem Querschnitt ändernder Weite gebildet. Die Breite a der Flächen 14, 15 liegt in der Größenordnung von 1 mm und der Abrundungsradius r der Fläche 16 in der Größenordnung von 20-30 mm. Das untere Ende des aufgesetzten Kernteils 2 kann dann wie in Fig. 2a eben ausgebildet sein. Das hat den Vorteil, daß der Kernteil 2 leichter herstellbar ist. Das Stirnende des Kernteils 2 kann aber auch wie das des Kernteils 3 ebenfalls eine konkave Fläche 16 aufweisen. Das hat den Vorteil, daß dann beide Kernteile 2, 3 identisch sind und somit nur ein Kernteil einer einzigen Sorte hergestellt werden muß.In FIG. 2e, the end of the core section 3 having a rectangular cross section has two rectangular, flat surfaces 14, 15 on two opposite edges, on which the core part 2, not shown, rests directly without an air gap, similar to that in FIG. 2c. Between the surfaces 14, 15, the end of the core part 3 is formed into a concave surface 16, which forms a section from a cylindrical surface. This also forms an air gap with a width that changes over the cross section. The width a of the surfaces 14, 15 is of the order of 1 mm and the radius of curvature r of the surface 16 is of the order of 20-30 mm. The lower end of the attached core part 2 can then be flat as in FIG. 2a. This has the advantage that the core part 2 is easier to manufacture. The front end of the core part 2 can also have a concave surface 16 like that of the core part 3. This has the advantage that then both core parts 2, 3 are identical and thus only one core part of a single type has to be manufactured.

Fig. 3 zeigt die Verformung eines waagerechten weißen Balkens im wiedergegebenen Bild bei einem zu hohen Innenwiderstand der Hochspannungsquelle. Der voll ausgezogen dargestellte Weißbalken 9 liegt in der oberen Bildhälfte und erstreckt sich z. B. über 20 bis 30 Zeilen. Es sei angenommen, daß für den Weißbalken 9 der maximale Strahlstrom in der Größenordnung von 3000 bis 5000 µA liegt. Da sich der Weißbalken 9 über eine Vielzahl von Zeilen erstreckt, kann der Glättungskondensator für die Hochspannung, der in der Größenordnung von 1000 bis 2500 pF liegt, die Hochspannung nicht derart lange aufrechterhalten, so daß die Hochspannung während der Darstellung des Weißbalkens 9, also vom oberen zum unteren Rand in Richtung 10, abnimmt. Eine verringerte Hochspannung bewirkt aber eine Erhöhung der Ablenkempfindlichkeit, weil die Elektrorienstrahlen das Ablenkfeld mit geringerer Geschwindigkeit durchlaufen. Dadurch wird die. wirksame Horizontal-Ablenkamplitude, d. h. die Bildbreite vergrößert. Auch die Ablenkempfindlichkeit in Vertikalrichtung wird vergrößert, so, daß die Vertikalablenkung im unteren Bereich des Weißbalkens 9 zu groß wird. Dadurch ergibt sich der gestrichelt dargestellte verzerrte Weißbalken 11 mit einer in Richtung 10 zunehmenden Bildbreite und einer durch die erhöhte Vertikalablenkempfindlichkeit verringerten geometrischen Breite in Vertikalrichtung. Da diese Wirkung durch den zu hohen Innenwiderstand der Hochspannungsquelle bedingt und dieser Innenwiderstand durch die erfindungsgemäße Lösung verringert wird, wird auch die in Fig. 3 dargestellte Verzerrung bei der Wiedergabe des Weißbalkens 9 verringert.Fig. 3 shows the deformation of a horizontal white bar in the reproduced image if the internal resistance of the high voltage source is too high. The fully drawn white bar 9 is in the upper half of the picture and extends z. B. over 20 to 30 lines. It is assumed that the maximum beam current for the white bar 9 is of the order of 3000 to 5000 μA. Since the white bar 9 extends over a large number of lines, the smoothing capacitor for the high voltage, which is of the order of 1000 to 2500 pF, cannot maintain the high voltage for such a long time that the high voltage during the display of the white bar 9, i.e. from top to bottom in direction 10, decreases. A reduced high voltage, however, causes an increase in the sensitivity to deflection because the electric radiation passes through the deflection field at a lower speed. This will make the. effective horizontal deflection amplitude, ie the image width is increased. The sensitivity to deflection in the vertical direction is also increased, so that the vertical deflection in the lower region of the white bar 9 becomes too great. This results in the distorted white bar 11 shown in broken lines with an image width increasing in the direction 10 and a geometric width in the vertical direction reduced by the increased vertical deflection sensitivity. Since this effect is caused by the excessive internal resistance of the high-voltage source and this internal resistance is reduced by the solution according to the invention, the distortion shown in FIG. 3 when the white bar 9 is reproduced is also reduced.

In Fig. 4 ist die Hochspannung UH in Abhängigkeit vom Strahlstrom is für ein praktisch erprobtes Ausführungsbeispiel dargestellt. Die Kurve 12 zeigt diese Abhängigkeit für einen bekannten Zeilentransformator, der auf die 9. Harmonische der Rücklauffrequenz der Rücklaufschwingung abgestimmt ist und einen Luftspalt konstanter Weite aufweist. Es ist ersichtlich, daß der Innenwiderstand der Hochspannungsquelle, d. h. die Steigung der Kurve 12, etwa konstant ist. Dieser Innenwiderstand wirkt sich insbesondere bei hohem Strahlstrom in der beschriebenen Weise nachteilig aus. Die Kurve 13 zeigt die Abhängigkeit der Hochspannung vom Strahlstrom bei Anwendung der Erfindung. Es ist ersichtlich, daß bei gleicher Hochspannung bei Strahlstrom Null die Hochspannung mit steigendem Strahlstrom wesentlich weniger abfällt und daß außerdem der Innenwiderstand der Hochspannungsquelle, nämlich die Steigung der Kurve mit steigendem Strahlstrom, in erwünschter Weise abnimmt. Die Abhängigkeit der Hochspannung vom Strahlstrom wird also insbesondere bei hohen Strahlströmen > 1000 µA gegenüber der Kurve 12 verringert. Dadurch werden u. a. die anhand der Figur 3 erläuterten Fehler bei der Wiedergabe auf dem Bildschirm verringert.4 shows the high voltage U H as a function of the beam current is for a practical example. Curve 12 shows this dependency for a known line transformer which is tuned to the 9th harmonic of the return frequency of the return vibration and has an air gap of constant width. It can be seen that the internal resistance of the high voltage source, ie the slope of curve 12, is approximately constant. This internal resistance has a disadvantageous effect, in particular in the case of high beam current, in the manner described. Curve 13 shows the dependence of the high voltage on the beam current when using the invention. It can be seen that at the same high voltage at zero beam current, the high voltage drops significantly less with increasing beam current and that, in addition, the internal resistance of the high voltage source, namely the slope of the curve with increasing beam current, decreases in a desired manner. The dependency of the high voltage on the beam current is thus reduced, in particular in the case of high beam currents> 1000 μA, compared to curve 12. This reduces, among other things, the errors in the display on the screen explained with reference to FIG. 3.

Bei einem praktisch erprobten Ausführungsbeispiel wurden folgende Werte für den differentiellen Innenwiderstand Ri der Hochspannungsquelle gemessen:

Figure imgb0001
In a practical example, the following values were measured for the differential internal resistance Ri of the high voltage source:
Figure imgb0001

Es ist ersichtlich, daß bei Anwendung der Erfindung, also einem Luftspalt mit unterschiedlicher Weite, ohne zusätzliche Schaltungsmaßnahmen der Innenwiderstand der Hochspannungsquelle bei großen Strahlströmen verringert wird.It can be seen that when the invention is used, that is to say an air gap with different widths, the internal resistance of the high-voltage source is reduced with large beam currents without additional circuit measures.

Claims (14)

1. Line transformer for a television receiver having a primary winding bracket (5), a secondary winding (6) and two core parts (2, 3) which are placed together to provide an air gap, characterized in that the core parts (2, 3) are directly in contact, without air gap, over a limited part of their cross section and that an air gap (8), having a width which varies over the cross section, is provided over the remaining cross section.
2. Transformer according to Claim 1, characterized in that the core parts (2, 3) are directly in contact, without air gap, only at an edge.
3. Transformer according to Claim 1, characterized in that the width of the air gap increases like a wedge from the position of the direct contact of the core parts (2, 3).
4. Transformer according to Claim 1, characterized in that core parts (2, 3) are directly in contact, without air gap, over a quadrilateral surface (Fig. 2a, 2c, 2e).
5. Transformer according to Claim 1, characterized in that the boundary surfaces of the air gap (8) are planar.
6. Transformer according to Claim 1, characterized in that the air gap (8) is provided in the limb (7) of the core carrying no coils.
7. Transformer according to Claim 1, characterized in that the limb (4) carrying the coils (5, 6) exhibits no air gap.
8. Transformer according to Claim 1, characterized in that in the case of a core assembled from two U-formed core parts (2, 3) a limb of one of the core parts (3) is slanted at the end (Fig. 2a).
9; Transformer according to Claim 1, characterized in that in the case of a core assembled from two equally large U formed core parts (2, 3); both the core limbs applisd to each other are equally slanted so that the two core parts (2, 3) are identical.
10. Transformer according to Claim 3, characterized in that the. angle of opening (α of the wedge shaped air gap (8) is of the order of from f0° to 14° in magnitude.
11. Transformer according to Claim 1, characterized in that the core parts (2, 3) are directly in contact at two oppositely located-corners over a small quadrilateral part (14, 15) and that the end of the core part (3) is concavely formed in the remaining region of the cross sectional surface (Fig. 2e)
12. Transformer according to Claim 11, characterized, in that the breadth (a) of the cross sectional surface is of the order of 1 mm in magnitude.
13. Transformer according to Claim 11, characterized in that the surface at the front end of the core part (3) displays the form of a sector of a cylindrical surface in the remaining region of the cross sectional surface.
14. Transformer according to Claim 13, characterized in that the radius of curvature of the cylindrical surface is of the order of 20-30 mm in magnitude (Fig. 2e).
EP81103263A 1980-05-07 1981-04-30 Line transformer for a television receiver Expired EP0039485B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81103263T ATE8186T1 (en) 1980-05-07 1981-04-30 LINE TRANSFORMER FOR A TELEVISION RECEIVER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3017368 1980-05-07
DE19803017368 DE3017368A1 (en) 1980-05-07 1980-05-07 LINE TRANSFORMER FOR A TELEVISION RECEIVER

Publications (2)

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EP0039485A1 EP0039485A1 (en) 1981-11-11
EP0039485B1 true EP0039485B1 (en) 1984-06-27

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EP (1) EP0039485B1 (en)
JP (1) JPS5731113A (en)
AT (1) ATE8186T1 (en)
DE (2) DE3017368A1 (en)
HK (1) HK5990A (en)

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DE3140818A1 (en) * 1981-10-13 1983-04-21 Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut Module for generating EHT for television sets
JPH0415220U (en) * 1990-05-29 1992-02-06
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FR2725320B1 (en) * 1994-09-29 1996-10-31 Schneider Electric Sa TRIGGERING DEVICE HAVING AT LEAST ONE CURRENT TRANSFORMER
DE19515226A1 (en) * 1995-04-28 1996-11-07 Thomson Brandt Gmbh High voltage transformer for a television receiver
DE19528185A1 (en) * 1995-08-01 1997-02-06 Thomson Brandt Gmbh transformer
TR199902411A2 (en) 1998-11-02 2000-06-21 Lincoln Global, Inc. Output coil and usage method for direct current welding machine
US20030174039A1 (en) * 2000-05-11 2003-09-18 Bodger Patrick Selwyn Partial core, low frequency transformer
DE10128527A1 (en) * 2001-06-13 2002-12-19 Lite On Electronics Inc Inductor for large-current application, includes magnetic core with air gap having small and large gap portions and stair-shaped surface
WO2020070316A1 (en) * 2018-10-05 2020-04-09 Abb Schweiz Ag Magnetic core arrangement, inductive device and installation device

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Also Published As

Publication number Publication date
DE3017368A1 (en) 1981-11-12
ATE8186T1 (en) 1984-07-15
EP0039485A1 (en) 1981-11-11
JPS6339084B2 (en) 1988-08-03
JPS5731113A (en) 1982-02-19
HK5990A (en) 1990-02-02
DE3164409D1 (en) 1984-08-02

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