DE2034704A1 - Circuit arrangement for switching off the residual demagnetizing alternating current of a color television receiver - Google Patents

Circuit arrangement for switching off the residual demagnetizing alternating current of a color television receiver

Info

Publication number
DE2034704A1
DE2034704A1 DE19702034704 DE2034704A DE2034704A1 DE 2034704 A1 DE2034704 A1 DE 2034704A1 DE 19702034704 DE19702034704 DE 19702034704 DE 2034704 A DE2034704 A DE 2034704A DE 2034704 A1 DE2034704 A1 DE 2034704A1
Authority
DE
Germany
Prior art keywords
alternating current
switching
circuit arrangement
television receiver
color television
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.)
Pending
Application number
DE19702034704
Other languages
German (de)
Inventor
Peter 7300 Esshngen Schulz
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Standard Elektrik Lorenz AG
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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Priority to DE19702034704 priority Critical patent/DE2034704A1/en
Publication of DE2034704A1 publication Critical patent/DE2034704A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/29—Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Description

Schaltungsanordnung zur Abschaltung des Res-tentmag?etisierungs-lilechselstroms eines Farbfernsehempfängers Gegenstand der Erfindung ist eine Schaltungsanordnung zur Abschaltung des Restentmagnetisierungs-Wechselstroms eines Farbfernsehempfängers, bei der der Entmagnetisierungs-Wechselstrom über einen positiv temperaturabhängigen Widerstand (arc) der Entmagnetisierungsspule zugeführt wird und der dabei verbleibende Restentmagnetisierungs-Wechselstrom mitteiles eines Relais verzögert abgeschaltet wird.Circuit arrangement for switching off the residual magnetization alternating current of a color television receiver The invention is a circuit arrangement for switching off the residual demagnetization alternating current of a color television receiver, in which the demagnetizing alternating current has a positive temperature-dependent one Resistance (arc) is supplied to the degaussing coil and the remaining Residual demagnetization alternating current message of a relay switched off with a delay will.

Bei bekannten derartigen Schaltungsanordnungen erfolgt die Erregung des Relais und damit die Abschaltung des Restentmagnetisierungsstromes mitteis einer Zeitschaltung. Im Rahmen der an sich einfachen Schaltungsanordnung stellt diese Zeitschaltung einen beträchtlichen Aufwand dar.In known circuit arrangements of this type, the excitation takes place of the relay and thus the shutdown of the residual demagnetization current by means of a Timer. In the context of the circuit arrangement, which is simple per se, this represents Time switching represents a considerable effort.

Die Erfindung stellt sich daher die Aufgabe, eine. Schaltung der eingangs errJahnten Art, bei der diese Zeitschaltung nicht erforderlich ist, zu schaffen.The invention therefore has the task of providing a. Circuit of the input errJahnten way in which this timer is not required.

Nach der Erfindung wird dies bei einer Schaltungsanordnung der eingangs erwähnten Gattung dadurch erreicht, dass das Relais erst mit der verzögert einsetzenden Emission der indirekt geheizten Kathode einer der Empfängerröhren erregt wird.According to the invention, this becomes the initially mentioned in a circuit arrangement mentioned type achieved by the fact that the relay only starts with the delayed onset Emission of the indirectly heated cathode of one of the receiver tubes is excited.

Anhand der Ausführungsbeispiele werden im folgenden die Erfindung weitere ihrer Merkmale und Vorteile näher erläutert.The invention is described below on the basis of the exemplary embodiments further of their features and advantages explained in more detail.

In der Figur ist die Schaltung zur Entrgnetisierung einer Farbbildröhre gezeigt. Der Entmagnetisierungsstromkreis besteht aus dem Netzschalter 1, der bei einem ausgefünrten Empfänger das ganze Gerät einschaltet, dem Entmagnetisierungsnetzwerk, aus dem Widerstand mit positivem Temperaturverhalten 2, dem spannungsabhängigen Widerstand 3 und dem Widerstand 4 bestehend, sowie dem Abschaltkontakt 5 und der Entmagnetisierungsspule 6.The figure shows the circuit for de-energizing a color picture tube shown. The degaussing circuit consists of the power switch 1, which is at an executed receiver turns on the whole device, the degaussing network, from the resistance with positive temperature behavior 2, the voltage-dependent one Resistor 3 and the resistor 4, as well as the disconnection contact 5 and the Degaussing coil 6.

Wird das Gerät mit dem Netzschalter 1 eingeschaltet, so sorgt das Entmagnetisierungsnetzwerk dafür, dass der anfänglich sehr grosse Wechselstrom durch die Entmagnetisierungsspule 6 langsam bis auf einen verbleibenden Reststrom abnimmt. Dieser statische Zustand des Stromes ist nach ca. zehn Sekunden erreicht. Während dieser ganzen Zeit und einige Zeit danach bleibt der Abschaltkontakt 5 geschlossen. Erst dann, wenn närnlich die Empfängerröhre 8 angeheizt ist ur,d Kathodenstrom oder Schirmgitterstrom zu fliessen beginnt, wird das Relais 7, dessen Erregerxricklung in der Kathoden- oder Schirmgitterzuleitung der Röhre liegt, betätigt und öffnet dadurch den Abschaltkontakt 5.If the device is switched on with the mains switch 1, this takes care of that Demagnetization network ensures that the initially very large alternating current through the degaussing coil 6 slowly decreases to a residual current. This static state of the current is reached after approx. Ten seconds. While all this time and some time thereafter, the shutdown contact 5 remains closed. Only when the receiver tube 8 is heated up ur, d cathode current or If the screen grid current begins to flow, the relay 7, its Erregerxricklung is in the cathode or screen grid lead of the tube, actuates and opens thereby the switch-off contact 5.

Damit ist der Entma£;netisierungsstromkreis unterbrochen und der Restentmagnetisierungsstrom hört auf zu fliessen.This interrupts the demagnetization circuit and the residual demagnetization current stops flowing.

1 Patentanspruch 1 B1. Zeichnung mit 1 Fig.1 claim 1 B1. Drawing with 1 Fig.

Claims (1)

PatentanspruchClaim Schaltungsanordnung zur Abschaltung des Restentmagnetisierungs-Wechselstromes eines Farbfernsehempfängers, bei der der Entrnagnetisierungs-Wechselstrom über einen positiv temperaturabhängigen Widerstand (PTC) der Entmagnetisierungsspule zugeführt wird und der dabei verbleibende Restentmagnetisierungslrechselstrom mittels eines Relais verzögert abgeschaltet wird, dadurch gekennzeichnet, dass das Relais erst mit der verzögert einsetzenden Emission der indirekt geheizten Kathode einer der Empfängerröhren erregt wird.Circuit arrangement for switching off the residual demagnetizing alternating current of a color television receiver, in which the demagnetizing alternating current via a positive temperature-dependent resistor (PTC) fed to the degaussing coil and the remaining demagnetization current by means of a Relay is switched off with a delay, characterized in that the relay only with the delayed onset of the emission of the indirectly heated cathode one of the Receiver tubes is excited. L e e r s e i t eL e r s e i t e
DE19702034704 1970-07-13 1970-07-13 Circuit arrangement for switching off the residual demagnetizing alternating current of a color television receiver Pending DE2034704A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19702034704 DE2034704A1 (en) 1970-07-13 1970-07-13 Circuit arrangement for switching off the residual demagnetizing alternating current of a color television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702034704 DE2034704A1 (en) 1970-07-13 1970-07-13 Circuit arrangement for switching off the residual demagnetizing alternating current of a color television receiver

Publications (1)

Publication Number Publication Date
DE2034704A1 true DE2034704A1 (en) 1972-01-20

Family

ID=5776627

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702034704 Pending DE2034704A1 (en) 1970-07-13 1970-07-13 Circuit arrangement for switching off the residual demagnetizing alternating current of a color television receiver

Country Status (1)

Country Link
DE (1) DE2034704A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3118816A1 (en) * 1980-05-12 1982-02-11 RCA Corp., 10020 New York, N.Y. "DE-MAGNETIZING CIRCUIT FOR A COLOR TV RECEIVER"
US4742270A (en) * 1985-09-30 1988-05-03 Rca Corporation Degaussing circuit with residual current cutoff

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3118816A1 (en) * 1980-05-12 1982-02-11 RCA Corp., 10020 New York, N.Y. "DE-MAGNETIZING CIRCUIT FOR A COLOR TV RECEIVER"
US4742270A (en) * 1985-09-30 1988-05-03 Rca Corporation Degaussing circuit with residual current cutoff

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