EP0405081B1 - Diode-split transformer - Google Patents

Diode-split transformer Download PDF

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Publication number
EP0405081B1
EP0405081B1 EP90107399A EP90107399A EP0405081B1 EP 0405081 B1 EP0405081 B1 EP 0405081B1 EP 90107399 A EP90107399 A EP 90107399A EP 90107399 A EP90107399 A EP 90107399A EP 0405081 B1 EP0405081 B1 EP 0405081B1
Authority
EP
European Patent Office
Prior art keywords
diode
earth
winding
closest
split transformer
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.)
Expired - Lifetime
Application number
EP90107399A
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German (de)
French (fr)
Other versions
EP0405081A1 (en
Inventor
Klaus Grundig E.M.V. Max Grundig Neuhaus
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.)
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Priority to AT90107399T priority Critical patent/ATE98414T1/en
Publication of EP0405081A1 publication Critical patent/EP0405081A1/en
Application granted granted Critical
Publication of EP0405081B1 publication Critical patent/EP0405081B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a diode split transformer for generating the high voltage in television receivers with the features specified in the preamble of claim 1.
  • a circuit for generating the deflection voltages for a cathode ray tube which contains, inter alia, a transformer and a circuit connected to the primary winding of the transformer, which is also known under the name booster diode saving circuit. This has the task of providing an increased operating voltage for the forward run at the line deflection coils. The diode contained in this circuit also dampens vibrations occurring in the transformer.
  • Diode split transformers with the features specified in the preamble of claim 1 are known, for example, from the magazines “Funk-Technik", 1979, number 4, pages T183-T184, and “Funkschau", 1976, number 24, pages 1051-1054. They are used to obtain the picture tube high voltage from the flashback pulses present in the return period in the horizontal output stage.
  • a problem with such diode split transformers is that ringing effects, which deteriorate the image quality, occur undesirably during line scrolling.
  • the object of the invention is to develop a diode split transformer with the features specified in the preamble of claim 1 such that the ringing effects are completely eliminated in a simple manner while avoiding the aforementioned disadvantages, so that the image quality no longer deteriorates.
  • the figure shows a diode split transformer with a primary winding lp and a secondary winding divided into several partial windings l1, l2 and l3.
  • the partial windings mentioned are connected to one another via diodes D1 and D2.
  • a further diode D3 is arranged between the partial winding l3 and the picture tube.
  • the connection of the partial winding l1 which is not connected to the diode D1 is connected to ground via a parallel circuit comprising a capacitor C1 and a resistor R1.
  • the invention is based on the knowledge that mainly the sub-winding l1 closest to the mass is responsible for the ringing effects.
  • a diode D4 is now connected in parallel to this partial winding l1 in such a way that its anode is connected to ground via the parallel connection of a resistor R2 and a capacitor C2 and its cathode is connected to the distal connection of the partial winding l1, then interference oscillations are derived to ground during the line trace .
  • the resistor R1 is additionally designed as a controllable resistor or as a potentiometer, at the tap of which the screen grid voltage UG for the picture tube is removed.
  • a controllable resistor or as a potentiometer at the tap of which the screen grid voltage UG for the picture tube is removed.
  • This potentiometer simple insulation. It does not have to be potted with the other transformer components or installed in an insulating housing with the focus regulator, as is customary in the case of previously known diode split transformers.
  • a control signal for a protective circuit of the television receiver is derived from the connection point between the diode D4 and the resistor R 2.
  • This protective circuit can be a circuit for beam current limitation.
  • a potentiometer R4 is provided between the cathode of the diode D1 connecting the closest partial winding l1 to the next partial winding l2 and ground, from whose tap the focusing voltage UF for the picture tube is derived.
  • This potentiometer can be plugged directly onto the insulating tube on the diode split transformer during manufacture of the diode split transformer and does not have to be attached to the picture tube plate, as is the case with many known arrangements.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Details Of Television Scanning (AREA)
  • Rectifiers (AREA)

Abstract

In known diode split transformers, transient effects occur during the forward line trace which impair the image quality. In the novel diode split transformer, no transient effects impairing the image quality should occur. Essentially, this is achieved by the fact that a diode (D4) is connected in parallel with the part-winding (I1) of the diode split transformer which is closest to earth, in such a manner that interference oscillations occurring at the part winding closest to earth during the forward line trace are bypassed to earth. <IMAGE>

Description

Die Erfindung betrifft einen Diodensplit-Transformator zur Erzeugung der Hochspannung in Fernsehempfängern mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen.The invention relates to a diode split transformer for generating the high voltage in television receivers with the features specified in the preamble of claim 1.

Aus der US-A-2,796,552 ist eine Schaltung zur Erzeugung der Ablenkspannungen für eine Kathodenstrahlröhre bekannt, welche unter anderem einen Transformator und eine mit der Primärwicklung des Transformators verbundene Schaltung enthält, die auch unter dem Namen Booster-Dioden-Sparschaltung bekannt ist. Diese hat die Aufgabe, eine erhöhte Betriebsspannung für den Hinlauf an den Zeilenablenkspulen bereitzustellen. Die in dieser Schaltung enthaltene Diode bewirkt auch eine Dämpfung von im Transformator auftretenden Schwingungen.From US-A-2,796,552 a circuit for generating the deflection voltages for a cathode ray tube is known, which contains, inter alia, a transformer and a circuit connected to the primary winding of the transformer, which is also known under the name booster diode saving circuit. This has the task of providing an increased operating voltage for the forward run at the line deflection coils. The diode contained in this circuit also dampens vibrations occurring in the transformer.

Diodensplit-Transformatoren mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen sind beispielsweise aus den Zeitschriften "Funk-Technik", 1979, Heft 4, Seiten T183-T184, und "Funkschau", 1976, Heft 24, Seiten 1051-1054, bekannt. Sie dienen dazu, aus den in der Horizontalendstufe in der Rücklaufperiode vorliegenden Rückschlagimpulsen die Bildröhren-Hochspannung zu gewinnen. Ein Problem derartiger Diodensplit-Transformatoren besteht darin, daß in unerwünschter Weise während des Zeilenhinlaufs Nachschwingeffekte (sog. "ringing") auftreten, die die Bildqualität verschlechtern.Diode split transformers with the features specified in the preamble of claim 1 are known, for example, from the magazines "Funk-Technik", 1979, number 4, pages T183-T184, and "Funkschau", 1976, number 24, pages 1051-1054. They are used to obtain the picture tube high voltage from the flashback pulses present in the return period in the horizontal output stage. A problem with such diode split transformers is that ringing effects, which deteriorate the image quality, occur undesirably during line scrolling.

Aus der DE-PS 28 41 885 und der DE-PS 36 02 005 ist es bereits bekannt, diese Nachschwingeffekte unter Verwendung einer Hilfswicklung zu reduzieren. Mittels dieser Hilfswicklung lassen sich die Nachschwingeffekte jedoch nicht vollständig beseitigen. ohne daß die Hochspannungserzeugung negativ beeinflußt wird.From DE-PS 28 41 885 and DE-PS 36 02 005 it is already known to reduce these ringing effects using an auxiliary winding. However, the ringing effects cannot be completely eliminated by means of this auxiliary winding. without the high-voltage generation being adversely affected.

Die Aufgabe der Erfindung besteht darin, einen Diodensplit-Transformator mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen derart weiterzubilden, daß auf einfache Art und Weise unter Vermeidung der vorgenannten Nachteile die Nachschwingeffekte vollständig beseitigt werden, so daß keine Verschlechterung der Bildqualität mehr auftritt.The object of the invention is to develop a diode split transformer with the features specified in the preamble of claim 1 such that the ringing effects are completely eliminated in a simple manner while avoiding the aforementioned disadvantages, so that the image quality no longer deteriorates.

Diese Aufgabe wird bei einem Diodensplit-Transformator der im Oberbegriff des Anspruchs 1 angegebenen Art durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.This object is achieved in a diode split transformer of the type specified in the preamble of claim 1 by the features specified in the characterizing part of claim 1. Advantageous further developments result from the subclaims.

Die Vorteile der Erfindung bestehen insbesondere darin, daß die bei bekannten Diodensplit-Transformatoren auftretenden Nachschwingeffekte durch eine einfache schaltungstechnische Maßnahme beseitigt werden. Weitere vorteilhafte Eigenschaften der Erfindung ergeben sich aus der beispielhaften Erläuterung der Erfindung anhand der Figur.The advantages of the invention consist in particular in that the ringing effects which occur in known diode split transformers are eliminated by a simple circuit measure. Further advantageous properties of the invention result from the exemplary explanation of the invention with reference to the figure.

Die Figur zeigt einen Diodensplit-Transformator mit einer Primärwicklung lp und einer in mehrere Teilwicklungen l1, l2 und l3 aufgeteilten Sekundärwicklung. Die genannten Teilwicklungen sind über Dioden D1 und D2 miteinander verbunden. Zwischen der Teilwicklung l3 und der Bildröhre ist eine weitere Diode D3 angeordnet. Der nicht mit der Diode D1 verbundene Anschluß der Teilwicklung l1 ist über eine Parallelschaltung aus einem Kondensator C1 und einem Widerstand R1 an Masse gelegt.The figure shows a diode split transformer with a primary winding lp and a secondary winding divided into several partial windings l1, l2 and l3. The partial windings mentioned are connected to one another via diodes D1 and D2. A further diode D3 is arranged between the partial winding l3 and the picture tube. The connection of the partial winding l1 which is not connected to the diode D1 is connected to ground via a parallel circuit comprising a capacitor C1 and a resistor R1.

Die Erfindung beruht auf der Erkenntnis, daß hauptsächlich die massenäheste Teilwicklung l1 für die Nachschwingeffekte verantwortlich ist.The invention is based on the knowledge that mainly the sub-winding l1 closest to the mass is responsible for the ringing effects.

Wird nun parallel zu dieser Teilwicklung l1 eine Diode D4 derart geschaltet, daß ihre Anode über die Parallelschaltung eines Widerstandes R2 und eines Kondensators C2 mit Masse und ihre Kathode mit dem massefernen Anschluß der Teilwicklung l1 verbunden ist, dann werden während des Zeilenhinlaufs Störschwingungen nach Masse abgeleitet.If a diode D4 is now connected in parallel to this partial winding l1 in such a way that its anode is connected to ground via the parallel connection of a resistor R2 and a capacitor C2 and its cathode is connected to the distal connection of the partial winding l1, then interference oscillations are derived to ground during the line trace .

Gemäß einer vorteilhaften Weiterbildung der Erfindung ist zusätzlich der Widerstand R1 als regelbarer Widerstand bzw. als Potentiometer ausgebildet, an dessen Abgriff die Schirmgitterspannung UG für die Bildröhre abgenommen wird. Für dieses Potentiometer genügt eine einfache Isolierung. Es muß nicht - wie es bei bisher bekannten Diodensplit-Transformatoren üblich ist - mit den übrigen Transformatorbauteilen vergossen werden oder mit dem Fokus-Regler in einem Isoliergehäuse eingebaut sein.According to an advantageous development of the invention, the resistor R1 is additionally designed as a controllable resistor or as a potentiometer, at the tap of which the screen grid voltage UG for the picture tube is removed. One is sufficient for this potentiometer simple insulation. It does not have to be potted with the other transformer components or installed in an insulating housing with the focus regulator, as is customary in the case of previously known diode split transformers.

Gemäß einer weiteren vorteilhaften Weiterbildung der Erfindung wird vom Verbindungspunkt zwischen der Diode D4 und dem Widerstand R 2 ein Regelsignal für eine Schutzschaltung des Fernsehempfängers abgeleitet. Bei dieser Schutzschaltung kann es sich um eine Schaltung zur Strahlstrombegrenzung handeln.According to a further advantageous development of the invention, a control signal for a protective circuit of the television receiver is derived from the connection point between the diode D4 and the resistor R 2. This protective circuit can be a circuit for beam current limitation.

Gemäß einer weiteren vorteilhaften Weiterbildung der Erfindung ist zwischen der Kathode der die massenäheste Teilwicklung l1 mit der nächsten Teilwicklung l2 verbindenen Diode D1 und Masse ein Potentiometer R4 vorgesehen, von dessen Abgriff die Fokussierspannung UF für die Bildröhre abgeleitet wird. Dieses Potentiometer kann bei der Fertigung des Diodensplit-Transformators direkt auf das Isolierrohr am Diodensplit-Transformator aufgesteckt werden und muß nicht - wie es bei vielen bekannten Anordnungen der Fall ist - an der Bildröhrenplatte befestigt werden.According to a further advantageous development of the invention, a potentiometer R4 is provided between the cathode of the diode D1 connecting the closest partial winding l1 to the next partial winding l2 and ground, from whose tap the focusing voltage UF for the picture tube is derived. This potentiometer can be plugged directly onto the insulating tube on the diode split transformer during manufacture of the diode split transformer and does not have to be attached to the picture tube plate, as is the case with many known arrangements.

Claims (4)

  1. Diode-split transformer for generating the high voltage in television receivers, having a primary winding and a secondary winding, divided into a plurality of part-windings respectively interconnected via a diode, characterized in that parallel to the part-winding (l1) closest to earth there is connected a diode (D4), the cathode of which is connected to the earth-remote terminal of the part-winding (l1) closest to earth, so that interfering oscillations occurring during the line sweep at the part-winding (l1) closest to earth are diverted to earth.
  2. Diode-split transformer according to Claim 1, characterized in that the parallel connection of a capacitor (C1) and a potentiometer (R1) is provided between the terminal closer to earth of the part-winding (l1) closest to earth and earth and the screen grid voltage (UG) for the picture tube is taken from the tap of the potentiometer (R1).
  3. Diode-split transformer according to Claim 1 or 2, characterized in that a control signal for a protective circuit of the television receiver is derived from the base point of the diode (D4) arranged parallel to the part-winding (l1) closest to earth.
  4. Diode-split transformer according to one or more of Claims 1 - 3, characterized in that the focusing voltage (UF) for the picture tube is derived from the cathode of the diode (D1) connecting the part-winding (l1) closest to earth to the closest part-winding (12).
EP90107399A 1989-06-28 1990-04-19 Diode-split transformer Expired - Lifetime EP0405081B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90107399T ATE98414T1 (en) 1989-06-28 1990-04-19 DIODE SPLIT TRANSFORMER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3921096 1989-06-28
DE3921096A DE3921096A1 (en) 1989-06-28 1989-06-28 Diode split transformer

Publications (2)

Publication Number Publication Date
EP0405081A1 EP0405081A1 (en) 1991-01-02
EP0405081B1 true EP0405081B1 (en) 1993-12-08

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ID=6383724

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Application Number Title Priority Date Filing Date
EP90107399A Expired - Lifetime EP0405081B1 (en) 1989-06-28 1990-04-19 Diode-split transformer

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EP (1) EP0405081B1 (en)
AT (1) ATE98414T1 (en)
DE (2) DE3921096A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2796552A (en) * 1955-05-02 1957-06-18 Rca Corp Deflection coil isolation circuitry
DE3122588A1 (en) * 1981-06-06 1983-04-14 Standard Elektrik Lorenz Ag, 7000 Stuttgart LINE TRANSFORMER FOR TELEVISIONS

Also Published As

Publication number Publication date
ATE98414T1 (en) 1993-12-15
DE3921096A1 (en) 1991-01-03
EP0405081A1 (en) 1991-01-02
DE59003761D1 (en) 1994-01-20

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