DE3139927A1 - Horizontal deflection circuit for cathode ray tubes in television receivers - Google Patents
Horizontal deflection circuit for cathode ray tubes in television receiversInfo
- Publication number
- DE3139927A1 DE3139927A1 DE19813139927 DE3139927A DE3139927A1 DE 3139927 A1 DE3139927 A1 DE 3139927A1 DE 19813139927 DE19813139927 DE 19813139927 DE 3139927 A DE3139927 A DE 3139927A DE 3139927 A1 DE3139927 A1 DE 3139927A1
- Authority
- DE
- Germany
- Prior art keywords
- capacitor
- series
- horizontal deflection
- deflection circuit
- television receivers
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/237—Distortion correction, e.g. for pincushion distortion correction, S-correction using passive elements, e.g. diodes
Abstract
Description
Horizontalablenkschaltung für Katodenstrahlröhren Horizontal deflection circuit for cathode ray tubes
in Fernsehempfängern Beschreibung Die Erfindung betrifft eine Horizontalablenkschaltung für Ka40denstrahlröhren, vorzugsweise in Fernsehempfängern, bestehend aus der Serienschaltung von Ablenkspulen,. Linearitätseinsteller, einem Tangens-Korrekturkondensator und der dazu parallel angeordneten Serienschaltung aus Zeilentransformator und zugehörigem Serienkondensator, sowie aus Rücklaufkondensator und Ablenkschalter. in television receivers Description The invention relates to a horizontal deflection circuit for Ka40den ray tubes, preferably in television receivers, consisting of the series circuit of deflection coils ,. Linearity adjuster, a tangent correction capacitor and the series circuit arranged in parallel with the flyback transformer and associated Series capacitor, as well as a return capacitor and deflection switch.
Bei derartigen Fernsehempfängern ist ein Störeffekt bekannt, der immer dann auftritt, wenn auf einem dunklen Hintergrund einzelne helle waagrechte Linien auftreten (z.B. Gittermustertestbild nach Fig. 2b). In diesem Fall erscheinen senkrechte gerade Linien unterhalb der waawrechten Gitterlinien als Wellenlinien in Form einer gedämpften Schwingung, wie in Fig. 2a dargestellt ist.In such television receivers, an interference effect is known that always occurs when single light horizontal lines on a dark background occur (e.g. grid pattern test image according to Fig. 2b). In this case, verticals appear straight lines below the horizontal grid lines as wavy lines in the form of a damped oscillation, as shown in Fig. 2a.
Besonders stark tritt dieser Störeffekt auf, wenn, wie es bei den Schaltungskonzepten moderner Fernsehempfänger der Fall ist, der Zeilentransformator nur zur Gewinnung von Hilfsspannungen und der Beschleunigungsspannung für die Bildröhre dient.This disruptive effect occurs particularly strongly when, as is the case with the Circuit concepts of modern television receivers is the case, the flyback transformer only for obtaining auxiliary voltages and the acceleration voltage for the picture tube serves.
Es wurden in der Vergangenheit immer wieder Versuche unternommen, um diesen Störeffekt zu beseitigen, jedoch offenbar ohne durchschlagenden Erfolg.Attempts have repeatedly been made in the past to eliminate this disruptive effect, but apparently without resounding success.
Hier will die Erfindung Abhilfe schaffen. Der Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, liegt die Aufgabe zugrunde, mit einfachen Mitteln diesen Störeffekt zu verhindern, um dadurch die Qualität des Fernsehbildes zu erhöhen.The invention aims to provide a remedy here. The invention as it is in the claims is characterized, the underlying task is to use simple means to prevent this disruptive effect in order to increase the quality of the television picture.
Die durch die Erfindung erreichten Vorteile bestehen inbesondere darin, daß die Bildqualität wesentlich verbessert ist, weil keine Verformungen von senkrechten Linien und 4) Kanten unterhalb von einzelnen waagfvecht verlaufenden hellen Linien mehr auftreten.The advantages achieved by the invention consist in particular in that the image quality is significantly improved because there are no deformations of perpendicular Lines and 4) edges below individual horizontal light lines occur more.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and is described in more detail below.
Die Horizontalablenkschaltung nach Fig. 1 enthält Ablenkspulen 1, die zusammen mit einem Linearitätseinsteller 2 und einem Tangens-Korrekturkondensator 3 eine Serienschaltung bilden, die einerseits parallel zu einer zweiten Serienschaltung, bestehend aus der Primärwicklung eines Zeilentransformators 4 und einem Serienkondensator 5, und andererseits parallel zu einem Rücklaufkondensator 15 und zu einem Ablenkschalter 6, bestehend aus einem Transistor 7 und einer antiparallel angeordneten Diode 8, liegt. Die Betriebsspannung wird aus einer Gleichspannungsquelle 9 über eine Speisedrossel 10 eingespeist. Der Basis des Transistors 7 werden zeilenfrequente Steuerimpulse zugeführt. Die Sekundärwicklung des Zeilentransformators 4 liefert eine Hochspannung, die nach Gleichrichten und Vervielfachen mit einer Gleichrichteranordnung 13 in einem Kondensator 14 gespeichert wird und als Beschleunigungsspannung für die (nicht dargestellte) Bildröhre dient.The horizontal deflection circuit according to FIG. 1 contains deflection coils 1, which together with a linearity adjuster 2 and a tangent correction capacitor 3 form a series circuit which, on the one hand, is parallel to a second series circuit, consisting of the primary winding of a flyback transformer 4 and a series capacitor 5, and on the other hand in parallel with a flyback capacitor 15 and a deflection switch 6, consisting of a transistor 7 and an anti-parallel diode 8, lies. The operating voltage is obtained from a DC voltage source 9 via a feed choke 10 fed. The base of the transistor 7 are line-frequency control pulses fed. The secondary winding of the flyback transformer 4 supplies a high voltage, after rectifying and multiplying with a rectifier arrangement 13 in a capacitor 14 is stored and used as an acceleration voltage for the (not shown) picture tube is used.
Erfindungsmäßig sind nun die Elemente 1, 2, 3 der ersten und 4, 5 der zweiten Serienschaltung so angeordnet, daß die einen Anschlüsse des Serienkondensators 5 und des Tangens-Korrekturkondensätors 3 an demselben Potential, vorzugsweise Bezugspotential liegen, während die beiden anderen Anschlüsse dieser Kondensatoren 5, 3 über ein Impedanzglied miteinander verbunden sind, das aus der Serienschaltung eines ohmschen Widerstandes 11 von vorzugsweise einigen hundert Ohm mit einer Induktivität 12 besteht.Elements 1, 2, 3 of the first and 4, 5 are now in accordance with the invention the second series circuit arranged so that the one terminals of the series capacitor 5 and the tangent correction capacitor 3 at the same potential, preferably Reference potential lie, while the other two connections of these capacitors 5, 3 via a Impedance member are connected to each other, which consists of the series circuit of an ohmic Resistance 11 of preferably a few hundred ohms with an inductance 12 is made.
Es genügt auch, nur einen Widerstand 11 einzufügen. Sein Energieverbrauch liegt dann im allgemeinen unter einem Watt und ist somit durchaus vertretbar. Im Falle der Serienschaltung mit der Induktivität 12 kann die Verlustleistung jedoch erheblich verringert werden.It is also sufficient to insert just one resistor 11. Its energy consumption is then generally less than one watt and is therefore entirely acceptable. in the In the case of the series connection with the inductance 12, however, the power loss can can be reduced significantly.
Der Widerstand 11 wirkt stark dämpfend auf den Einschwingvorgang, dessen Auswirkungen an seinen beiden Anschlußpunkten gegenphasig auftreten, wogegen die betriebsmäßigen mittleren Gleichspannungen an den Anschlußpunkten in gleicher Richtung liegen, sich somit also aufheben. Der Einfluß des Widerstandes 11 auf die Ablenkschaltung ist gering und besteht nur darin, daß die überlagerten Parabelspannungen an beiden Kondensatoren 5, 3 nicht gleich groß sind. Bei der Verwendung der Serienschaltung aus Widerstand 11 und Induktivität 12 werden die von den Parabelspannungen hervorgerufenen Ausgleichströme wesentlich verringert, der niederfrequente Ausgleichsvorgang, der die Dämpfung des Einschwingens bewirkt, wird bei geeigneter Dimensionierung jedoch nur unwesentlich beeinflußt.The resistor 11 has a strong dampening effect on the transient process, the effects of which occur in phase opposition at its two connection points, whereas the operational mean DC voltages at the connection points are the same Direction, thus cancel each other out. The influence of the resistor 11 on the Deflection circuit is small and consists only in the fact that the superimposed parabolic voltages on both capacitors 5, 3 are not the same size. When using the series connection Resistance 11 and inductance 12 become those caused by the parabolic voltages Compensating currents significantly reduced, the low-frequency compensation process, the the damping of the transient effects is, however, with suitable dimensioning only marginally affected.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19813139927 DE3139927C2 (en) | 1980-10-30 | 1981-10-08 | Horizontal deflection circuit for cathode ray tubes in television receivers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3040859 | 1980-10-30 | ||
DE19813139927 DE3139927C2 (en) | 1980-10-30 | 1981-10-08 | Horizontal deflection circuit for cathode ray tubes in television receivers |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3139927A1 true DE3139927A1 (en) | 1982-05-27 |
DE3139927C2 DE3139927C2 (en) | 1983-08-18 |
Family
ID=25788808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19813139927 Expired DE3139927C2 (en) | 1980-10-30 | 1981-10-08 | Horizontal deflection circuit for cathode ray tubes in television receivers |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3139927C2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2732302A1 (en) * | 1977-07-16 | 1979-01-25 | Koerting Radio Werke Gmbh | TV line deflection circuit with east-west pincushion correction - has impedance switched in and out at line frequency between line transformer tap and junction of deflection coil and correction coil |
DE2744250A1 (en) * | 1977-10-01 | 1979-04-12 | Licentia Gmbh | East-west pincushion distortion correction circuit for colour TV - has two parallel paths for deflection current, one with inductor carrying S-correction free current increased at picture edges |
DE2747340A1 (en) * | 1977-10-21 | 1979-04-26 | Licentia Gmbh | Line deflection circuit with reduced distortion due to white loading - has diode and capacitor in series and connected in parallel to S-correction capacitor |
DE2559863B2 (en) * | 1974-04-18 | 1981-07-02 | RCA Corp., 10020 New York, N.Y. | East-west pillow correction circuit |
-
1981
- 1981-10-08 DE DE19813139927 patent/DE3139927C2/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2559863B2 (en) * | 1974-04-18 | 1981-07-02 | RCA Corp., 10020 New York, N.Y. | East-west pillow correction circuit |
DE2732302A1 (en) * | 1977-07-16 | 1979-01-25 | Koerting Radio Werke Gmbh | TV line deflection circuit with east-west pincushion correction - has impedance switched in and out at line frequency between line transformer tap and junction of deflection coil and correction coil |
DE2744250A1 (en) * | 1977-10-01 | 1979-04-12 | Licentia Gmbh | East-west pincushion distortion correction circuit for colour TV - has two parallel paths for deflection current, one with inductor carrying S-correction free current increased at picture edges |
DE2747340A1 (en) * | 1977-10-21 | 1979-04-26 | Licentia Gmbh | Line deflection circuit with reduced distortion due to white loading - has diode and capacitor in series and connected in parallel to S-correction capacitor |
Also Published As
Publication number | Publication date |
---|---|
DE3139927C2 (en) | 1983-08-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |