DE2407776A1 - Voltage regulator for TV receiver line output stage - has booster diode with transducer as variable regulating impedance - Google Patents
Voltage regulator for TV receiver line output stage - has booster diode with transducer as variable regulating impedanceInfo
- Publication number
- DE2407776A1 DE2407776A1 DE19742407776 DE2407776A DE2407776A1 DE 2407776 A1 DE2407776 A1 DE 2407776A1 DE 19742407776 DE19742407776 DE 19742407776 DE 2407776 A DE2407776 A DE 2407776A DE 2407776 A1 DE2407776 A1 DE 2407776A1
- Authority
- DE
- Germany
- Prior art keywords
- voltage
- output stage
- booster
- inductance
- line output
- 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
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
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
- H04N3/185—Maintaining dc voltage constant
- H04N3/1856—Maintaining dc voltage constant using regulation in series
Abstract
Description
Schaltung zur Regelung der Betriebsspannung für die Transistor-Zeilenendstufe eines Fernsehemafängers In einem Fernsehernpfänger ist es oft erforderlich, die Betrebsspannung für die Zeilenendstufe zu stabilisieren, damit diese von den Netzspannungsschwankungen nicht abhängig ist.Circuit for regulating the operating voltage for the transistor line output stage of a television receiver In a television receiver it is often necessary to have the Stabilize the operating voltage for the line output stage so that it is protected from the mains voltage fluctuations is not dependent.
Zweck dieser Stabilisierung ist es, die Bildbreite und weitere, aus dem Zeilentranformator durch Gleichrichtung der Wechselspannung erzeugte Betriebs-Hilfsspannungen zu stabilisieren.The purpose of this stabilization is to adjust the image width and more auxiliary voltages generated by the line transformer by rectifying the alternating voltage to stabilize.
Dazu ist es bekannt, die Betriebsspannung für die Zeilenendstufe einem elektronisch stabilisierten Netzgerät zu entnehmen.For this purpose, it is known to use the operating voltage for the line output stage electronically stabilized power supply.
Dieses erfordert aber einen relativ großen Schaltungsaufwand und hewirkt außerdem Spannungs- und Leistungsverluste.However, this requires a relatively large amount of circuitry and has an effect also voltage and power losses.
Es ist auch bekannt, mit einem gesteuerten Transistor, der im Betriebsstrom liegt, nur die Betriebs spannung für die Zeilenendstufe zu stabilisieren. Aber auch diese Lösung bewirkt Spannungs- und Leistungsverluste.It is also known to use a controlled transistor that is in operating current is to stabilize only the operating voltage for the line output stage. But also this solution causes voltage and power losses.
Es gibt Zeilenendstufen, die mit Spannungsrückgewinnung oder Strom-Spannungsrückgewinnung arbeiten und über eine Boosterdiode einen impulsförmigen Betriebsstrom aufnehmen.There are line output stages with voltage recovery or current-voltage recovery work and take up a pulsed operating current via a booster diode.
Die Erfindung hat sich die Aufgabe gestellt, für eine derartige Zeilenendstufe eine einfache Schaltung zur Regelung der Betriebsspannung zu schaffen, die weitestgehend verlustlos arbeitet.The invention has set itself the task for such a line output stage to create a simple circuit for regulating the operating voltage, as far as possible works lossless.
Diese Aufgabe wird durch die im Anspruch 1 beschriebene Erfindung gelöst. Vorteilhafte Ausführungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the invention described in claim 1 solved. Advantageous embodiments of the invention are given in the subclaims.
Die Erfindung beruht auf folgender Erkenntnis. Bei der beschriebenen Zeilenendstufe mit Spannungsrückgewinnung oder Strom-Spannungsrückgewinnung wird von der Endstufe über die Boosterdiode ein impulsförmiger Betriebsstrom aufgenommen.The invention is based on the following knowledge. With the described Line output stage with voltage recovery or current-voltage recovery is A pulsed operating current is absorbed by the output stage via the booster diode.
Dieser impulsförmige Betriebsstrom gestattet somit eine Änderung der an der Zeilenendstufe wirksamen Betriebs spannung mit einer steuerbaren Induktivität. Bei einer Zeilenendstufe, die einen reinen Betriebs-Gleichstrom aufnimmt, ist eine solche Schaltung nicht möglich, weil ein Gleichstrom durch eine veränderbare Induktivität nicht beeinflußt werden kann. Durch die Erfindung wird also der impulsförmige Betriebsstrom in vorteilhafter Weise zur Regelung der an der Zeilenendstufe wirksamen Betriebs spannung ausgenutzt. Da eine Induktivität nur einen geringen ohmschen Widerstand hat, hat die erfindungsgemäße Schaltung praktisch keine Verluste.This pulsed operating current thus allows a change in the at the line output stage effective operating voltage with a controllable inductance. In the case of a line output stage that consumes pure operating direct current, there is a Such a circuit is not possible because a direct current through a variable inductance cannot be influenced. The invention thus provides the pulsed operating current in an advantageous manner for regulating the effective operation at the line output stage voltage exploited. Since an inductance only has a low ohmic resistance has, the circuit according to the invention has practically no losses.
Es ist zwar bei einer Ablenkschaltung mit Thyristoren bekannt (DT-OS 2 325 370), zur Stabilisierung in den Weg des Betriebsstromes einen gesteuerten Transduktor einzuschalten. Dabei handelt es sich aber nicht um die der Erfindung zugrunde liegende Schaltung mit einem Endstufen-Transistor in Spannungsrückgewinnung oder Strom-Spannungsrückgewinnung und einer Boosterdiode, die einen impulsförmigen Betriebsstrom aufnimmt.It is known for a deflection circuit with thyristors (DT-OS 2,325,370), a controlled one for stabilization in the path of the operating current Switch on the transducer. However, this is not the case with the invention underlying circuit with an output stage transistor in voltage recovery or current-voltage recovery and a booster diode, which is a pulse-shaped Consumes operating current.
Bei der bekannten Thyristorschaltung entsteht an der Endstufe eine pulsierende Spannung. Damit sich diese Spannung ausbilden kann, muß zwischen der Betriebs spannung und der Endstufe ohnehin eine Drossel eingeschaltet sein. Da an dieser Drossel also eine Wechselspannung liegt, kann durch Steurung des Wertes der Drossel, z.B. durch Verwendung eines Transduktors, die Stromaufnahme und damit die Ablenkamplitude beeinflußt werden.In the case of the known thyristor circuit, a pulsating tension. So that this tension can develop, between the Operating voltage and the output stage have to be switched on anyway. There on This choke is therefore an alternating voltage, can by controlling the value of the Choke, e.g. by using a transducer, the current consumption and thus the Deflection amplitude can be influenced.
Bei dieser bekannten Schaltung ist also der Transduktor aus einem anderen Grunde in die Schaltung eingefügt und wirkt auch auf andere Weise. Das Prinzip dieser bekannten Schaltung kann bei der der Erfindung zugrundeliegenden Schaltung mit einer Boosterdiode nicht ohne weiteres angewendet werden.In this known circuit, the transducer is made of one inserted into the circuit for another reason and also acts in a different way. The principle this known circuit can be used in the circuit on which the invention is based cannot easily be used with a booster diode.
Die Erfindung wird'anhand der Zeichnung an einem Ausführungsbeispiel erläutert. Darin zeigen Figur 1 ein Ausführungsbeispiel der Erfindung und Figur 2,3 Strom- und Spannungsverläufe zur Erläuterung der Wirkungsweise. Die kleinen Buchstaben zeigen, an welchen Punkten in Figur 1 die Spannungen gemäß Figur 2,3 stehen.The invention is illustrated by means of the drawing using an exemplary embodiment explained. FIG. 1 shows an exemplary embodiment of the invention and FIG 2.3 Current and voltage curves to explain how they work. The small Letters show at which points in FIG. 1 the voltages according to FIG. 2, 3 stand.
Figur 1 zeigt zunächst eine bekannte Zeilenablenkschaltung mit einem Netzgleichrichter 1, einen Schutzwiderstand 2, einem Ladekondensator 3, der an einem Punkt d eine gleichgerichtete Netzspannung erzeugt. Die Zeilenendstufe enthält eine Boosterdiode 7, einen Zeilentransformator 8, einen Zeilenendstufen-Transistor 9, einen Boosterkondensator 10, einen Rücklaufkondensator 11, einen auch zur Tangensentzerrung dienenden Koppelkondensator 12 und eine Ablenkeinheit 13. Mit einer Hochspannungswicklung 17 und einem Gleichrichter 18 wird die Hoch an nung für die nicht dargestellte Bildröhre erzeugt. Der Transistor 9 wird von einer Oszillator- und Treiberschaltung 15 gesteuert, die ihre Betriebsspannung vom Boosterkondensator 10 erhält. Bei einer solchen Schaltung fließt über die Leitung 19 ein impulsförmiger Strom i1 über die Boosterdiode 7 zum Transformator 8.Figure 1 first shows a known line deflection circuit with a Mains rectifier 1, a protective resistor 2, a charging capacitor 3, which is connected to a Point d generates a rectified line voltage. The line end stage contains a Booster diode 7, a flyback transformer 8, a flyback transistor 9, a booster capacitor 10, a return capacitor 11, one also for tangent equalization Serving coupling capacitor 12 and a deflection unit 13. With a high-voltage winding 17 and a rectifier 18 is the high voltage for the picture tube, not shown generated. The transistor 9 is controlled by an oscillator and driver circuit 15, which receives its operating voltage from the booster capacitor 10. With such a circuit A pulsed current i1 flows via the line 19 via the booster diode 7 to the Transformer 8.
Wenn die Netzspannung schwankt, schwankt auch die Spannung am Punkt d, damit die Boosterspannung am Punkt c und damit auch in unerwünschter Weise die Bildbreite.When the line voltage fluctuates, the voltage at the point also fluctuates d, so that the booster voltage at point c and thus also in an undesirable manner the Image width.
Zur Stabilisierung der Bildbreite ist in den Weg des Betriebsstromes ein Transduktor 5 mit seiner Arbeitswicklung 21 eingeschaltet. Die Steuerwicklung 20 des Transduktors 5 liegt einerseits an einer Betriebs spannung von +24 V und andererseits am Ausgang einer Steuerschaltung 16, an die außerdem die am Boosterkondensator 10 stehende Spannung angelegt ist.To stabilize the image width is in the way of the operating current a transductor 5 with its working winding 21 switched on. The control winding 20 of the transducer 5 is on the one hand due to an operating voltage of +24 V and on the other hand at the output of a control circuit 16, to which the booster capacitor 10 standing voltage is applied.
In der Schaltung 16 wird die geteilte Boosterspannung mit einer Referenzspannung verglichen. Die daraus gewonnene Stellgröße steuert den in die Steuerwicklung 20 fließenden Strom i2 so, daß beim Sinken der Boosterspannung am Punkt c der Strom in der Steuerwicklung 20 ansteigt, die Induktivität des Transduktors abnimmt und der Strom i1 und damit die Spannung am Punkt c wieder erhöht wird. Die Diode 6 verhindert negative Spannungsspitzen, die aufgrund der nicht zu vermeidenden Wicklungskapazitäten der gesteuerten Induktivität auftreten können.In the circuit 16, the divided booster voltage is compared with a reference voltage compared. The manipulated variable obtained therefrom controls the input into the control winding 20 flowing current i2 so that when the booster voltage drops at point c the current in the control winding 20 increases, the inductance of the transductor decreases and the current i1 and thus the voltage at point c is increased again. The diode 6 prevents negative voltage peaks due to the unavoidable winding capacities the controlled inductance can occur.
Anhand der Figuren 2,3 wird die Wirkungsweise erläutert. Dabei wird für den Transformator 8 ein Übersetzungsverhältnis von 1:2 angenommen, d.h. die Boosterspannung am Punkt c ist doppelt so groß wie die Spannung am Punkt b während des Hinlaufs. Bei einer Boosterspannung von 320 V am Punkt c steht am Punkt b eine Spannung von 160 V. Als Ladespannung am Punkt d ist ein dazwischenliegender Wert von 240 V angenommen. Während des Hinlaufes liegt an der Arbeitswicklung 21 des Transduktors 5, also an der gesteuerten Induktivität, eine Spannung von 80 V.The mode of operation is explained on the basis of FIGS. 2, 3. It will a transformation ratio of 1: 2 assumed for the transformer 8, i.e. the Booster voltage at point c is twice the voltage at point b during of the outward run. With a booster voltage of 320 V at point c, there is a at point b Voltage of 160 V. The charging voltage at point d is an intermediate value assumed to be 240 V. During the outward run is on the working winding 21 of the Transductor 5, i.e. at the controlled inductance, a voltage of 80 V.
Der Strom durch diese Wicklung steigt während des Hinlaufes annähernd linear an, und zwar um so schneller, je größer die Spannung über der Arbeitswicklung 21 ist. Der Strom steigt andererseits um so langsamer an, je größer die Induktivität der Arbeitswicklung 21 ist. Während des Rücklaufes hat der Strom i1r der die Arbeitswicklung 21 und die Boosterdiode 7 durchfließt, das Bestreben, weiterzufließen. Dafür steht als einziger Weg die Boosterdiode 7 zur Verfügung. Demzufolge steigt die Spannung am Punkt a an, steuert die Diode 7 leitend und folgt somit dem Verlauf der Rücklaufspannung am Punkt b (gestrichelte Linie) solange, bis der Strom durch die Boosterdiode 7 abgeklungen ist. Danach fällt die Spannung am Punkt a steil ab, um nach einem mit der Diode 6 begrenzten Uberschwingen den Wert der Ladespannung am Punkt d anzunehmen. Da an der Arbeitswicklung 21 keine Gleichspannung liegen kann, sind die beiden dargestellten Flächen F1 und F2 einander gleich. Daraus folgt, daß bei einer reduzierten Ladespannung am Punkt d von z.B. 200 V der Abfall der Spannung am Punkt a gemäß Figur 3 während des Rücklaufes früher erfolgen muß. Im Vergleich zu Figur 2 bekommt man praktisch den gleichen, der Stromaufnahme der Zeilenendstufe entsprechenden Gleichanteil des Stromes i1 durch die Boosterdiode 7, wenn die Induktivität der Arbeitswicklung 21 annähernd halbiert wird. Auf der anderen Seite können bei praktisch konstanter Ladespannung durch entsprechende Änderung der Induktivität der Wicklung 21 Schwankungen der Stromaufnahme der Zeilenendstufe aufgefangen werden, wie es durch den gestrichelten gezeichneten Verlauf des Stromes i1 in Figur 2 unten angedeutet ist.The current through this winding almost increases during the run-out linearly, and the faster the higher the voltage across the working winding 21 is. On the other hand, the greater the inductance, the slower the current increases the working winding 21 is. During the retraction, the current i1r has the working winding 21 and the booster diode 7 flowing through, the striving to keep flowing. The booster diode 7 is the only way to do this. As a result, it increases the voltage at point a, controls the diode 7 conductive and thus follows the course the return voltage at point b (dashed line) until the current passes through the booster diode 7 has decayed. Then the voltage drops sharply at point a, after an overshoot limited by the diode 6, the value of the charging voltage at point d to be assumed. Since there is no DC voltage on the working winding 21 can, the two areas shown F1 and F2 are equal to each other. It follows, that with a reduced charging voltage at point d of e.g. 200 V the drop in Voltage at point a according to Figure 3 must take place earlier during the return. in the Compared to Figure 2, you get practically the same, the power consumption of the line output stage corresponding direct component of the current i1 through the booster diode 7 if the inductance the working winding 21 is approximately halved. On the other hand, at practically constant charging voltage by changing the inductance accordingly the winding 21 absorbs fluctuations in the power consumption of the line output stage, as indicated by the dashed curve of the current i1 in FIG. 2 below is indicated.
In Abhängigkeit von dem Ist-Wert der Spannung am Punkt c wird also der Strom durch die Steuerwicklung 20 und damit der Wert der Induktivität der Arbeitswicklung 21 so gesteuert, daß bei Schwankungen der Netzspannung die Amplitude des Stromes i1 und damit die Bildbreite konstant bleiben. Der Transuktor 5 ist dabei ein passives Bauelement, das praktisch keine Verluste aufweist. Der Eingang der Schaltung 16 kann auch statt an Punkt c an Punkt d angeschlossen werden.Depending on the actual value of the voltage at point c, the current through the control winding 20 and thus the value of the inductance of the working winding 21 controlled so that the amplitude of the current in the event of fluctuations in the mains voltage i1 and thus the image width remain constant. The transuctor 5 is a passive one Component that has practically no losses. The input of circuit 16 can also be connected to point d instead of point c.
Claims (6)
Priority Applications (1)
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DE19742407776 DE2407776A1 (en) | 1974-02-19 | 1974-02-19 | Voltage regulator for TV receiver line output stage - has booster diode with transducer as variable regulating impedance |
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DE19742407776 DE2407776A1 (en) | 1974-02-19 | 1974-02-19 | Voltage regulator for TV receiver line output stage - has booster diode with transducer as variable regulating impedance |
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DE2407776A1 true DE2407776A1 (en) | 1975-09-04 |
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DE19742407776 Pending DE2407776A1 (en) | 1974-02-19 | 1974-02-19 | Voltage regulator for TV receiver line output stage - has booster diode with transducer as variable regulating impedance |
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