EP1225792A1 - Device for electrode heating in discharge lamps - Google Patents

Device for electrode heating in discharge lamps Download PDF

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Publication number
EP1225792A1
EP1225792A1 EP01129891A EP01129891A EP1225792A1 EP 1225792 A1 EP1225792 A1 EP 1225792A1 EP 01129891 A EP01129891 A EP 01129891A EP 01129891 A EP01129891 A EP 01129891A EP 1225792 A1 EP1225792 A1 EP 1225792A1
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EP
European Patent Office
Prior art keywords
operating device
electronic operating
frequency
discharge lamps
heating 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.)
Granted
Application number
EP01129891A
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German (de)
French (fr)
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EP1225792B1 (en
Inventor
Bernhard Schemmel
Michael Dr. Weirich
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps

Definitions

  • the invention is based on an electronic operating device according to the preamble of claim 1.
  • An electronic control gear mainly contains an alternating voltage generator, which provides an AC voltage from an oscillation frequency which is much higher than the frequency of the mains voltage.
  • the electronic control gear must start a connected discharge lamp and then manage their operation.
  • the start of a discharge lamp with electrode coils can be divided into preheating and ignition.
  • a current flows through the electrode coils to preheat them brings a temperature that allows a subsequent ignition that only a low one Brings damage to the electrode coil. Is the discharge lamp ignited, the discharge lamp begins to operate. In this state the Electricity for gas discharge in the lamp through the electrode coil connections fed.
  • a current that flows in at an electrode coil connection divides now on to a part that flows into the gas discharge and a part that flows into the other Connection of the same electrode coil flows out again.
  • the part of the stream that does not flow into the gas discharge causes an additional one compared to the gas discharge Heating the electrode coil, which is why this current is referred to as additional heating current becomes.
  • additional heating current should be compared to the current for the Gas discharge should be low (maximum 20%).
  • the electronic operating device contains a frequency-selective device which only permits preheating of the electrode filaments if the oscillation frequency of the electronic operating device is within a narrow frequency band, which is determined by the frequency-selective device.
  • the frequency-selective device is preferably formed by an oscillating circuit consisting of an inductance L and a capacitance C.
  • this frequency does not have to be set exactly. Rather, it is enough that the oscillation frequency of the electronic control gear for preheating is within a narrow frequency band around the resonance frequency fres. In the Practice has shown that a frequency band of +/- 10% around the resonance frequency is sufficient.
  • the inductance of the resonant circuit can be determined by the primary inductance of the heating transformer are formed. That the inductance, which is the primary winding of the heating transformer, forms together with one connected in series Series resonance capacitor or with a parallel resonance capacitor connected in parallel the resonant circuit.
  • the resonant circuit can also open the secondary side of the heating transformer. However, there the impedance level is lower, there are high resonance currents, which place a high load on the component represent.
  • a heating transformer can be used can be selected with a loose coupling.
  • the resonant circuit can also release voltage due to harmonics be stimulated. Since no additional heating current according to the invention during operation of the lamp the electronic control gear may flow at the operating frequency do not excite the resonant circuit with a harmonic. With operating frequency is meant the oscillation frequency at which the electronic control gear during operation of the lamp works. Because a square wave is only an odd number According to the invention, the resonant circuit is designed so that that its resonant frequency is at or near twice the operating frequency comes to lie. The inventive idea is then realized if the resonance frequency fres of the resonant circuit with a tolerance of +/- 20% in the double Operating frequency.
  • the series connection is present between output A and ground potential M.
  • a trapezoidal capacitor C13 and a resonant circuit according to the invention consists of the parallel connection of a parallel resonance capacitor C14 and the primary winding T11 of a heating transformer.
  • the trapezoidal capacitor C13 is used to couple the resonant circuit to the alternator G.
  • C13 can also be used to relieve switches from switches used in the alternator G are used.
  • the resonant circuit, consisting of C14 and T11 has a resonance frequency fres 1, based on the formula above can be calculated. For the inductance L indicated in the formula, the is on to use the primary winding T11 of the heating transformer effective primary inductance.
  • the heating transformer can be designed with a loose coupling in order to achieve sufficiently high values for the primary inductance.
  • the heating transformer has a secondary winding connected to each electrode coil T12 and T13.
  • the resonance frequency fres1 is designed such that that it is close to twice the operating frequency. So that's at the operating frequency the impedance of the resonant circuit compared to the impedance of C13 low. There is therefore only a small voltage at the primary winding T11 and there is only a negligibly small additional heating current in the electrode filaments fed.
  • the AC voltage generator G for preheating, the AC voltage generator G according to the invention a voltage whose frequency is close to the resonance frequency fres1.
  • a high current flows in the primary winding T11 of the heating transformer is transferred to the secondary windings T12 and T13 for preheating.
  • the trapezoidal capacitor C13 is omitted in FIGS. Possibly can also in Figures 2 and 3, a trapezoidal capacitor between the Output A and the ground potential M switched to the switch relief mentioned above become.
  • the resonant circuit T21 / C23 or T31 / C33 not with a square wave current from the alternating voltage generator G, but, due to the lamp choke L21 or L31, only with an almost sinusoidal current is applied, the resonance frequency fres1 des Resonant circuit T21 / C23 or T31 / C33 not close to twice the operating frequency lie.
  • FIG. 1 Another difference between Figure 1 and Figure 2 is that the Oscillating circuit, consisting of T21 and C23, in Figure 2 in series with the coupling capacitor C21 is switched. Furthermore, the explanations for FIG. 1 apply accordingly.
  • FIG. 4 shows the resonant circuit according to the invention not designed as a parallel resonant circuit, but as a series resonant circuit. He is formed from the series connection of a series resonance capacitor C43 and Primary winding of the heating transformer T41. At the operating frequency is the impedance the primary inductance at T41 compared to the impedance of C43. There is therefore only a small voltage on the primary winding T41 and it will only a negligibly small additional heating current is fed into the electrode filaments. Otherwise, the statements relating to FIG. 1 apply accordingly.
  • the exemplary embodiments are each equipped with a lamp.
  • the invention using techniques that are known to a person skilled in the art and from which State of the art are also transferred to applications with multiple lamps become.

Abstract

An electronic operating device connects to a gas discharge lamp (LP). An AC voltage generator (G) emits an AC voltage at an output (A) regarding a ground potential (M). The frequency of this AC voltage is higher than mains frequency. Between the output and the ground potential there is a series connection made up of a coupling capacitor (C11), a lamp choke (L11) and an ignition capacitor (C12) connected to the ground potential.

Description

Technisches GebietTechnical field

Die Erfindung geht aus von einem elektronischen Betriebsgerät gemäß dem Oberbegriff des Anspruchs 1.The invention is based on an electronic operating device according to the preamble of claim 1.

Ein elektronisches Betriebsgerät enthält in der Hauptsache einen Wechselspannungsgenerator, der eine Wechselspannung von einer Schwingfrequenz bereitstellt, die wesentlich höher ist als die Frequenz der Netzspannung. Durch geeignete Mittel muss das elektronische Betriebsgerät eine angeschlossene Entladungslampe starten und anschließend deren Betrieb bewerkstelligen. Der Start einer Entladungslampe mit Elektrodenwendeln kann unterteilt werden in die Vorheizung und in die Zündung. Zur Vorheizung fließt ein Strom durch die Elektrodenwendeln, der diese auf eine Temperatur bringt, die eine darauffolgende Zündung erlaubt, die nur eine geringe Schädigung für die Elektrodenwendel mit sich bringt. Ist die Entladungslampe gezündet, beginnt der Betrieb der Entladungslampe. In diesem Zustand wird der Strom für die Gasentladung in der Lampe durch die Elektrodenwendelanschlüsse zugeführt. Ein Strom, der bei einem Elektrodenwendelanschluss zufließt teilt sich nun auf in einen Teil, der in die Gasentladung fließt und einen Teil, der am anderen Anschluss der gleichen Elektrodenwendel wieder herausfließt. Der Teil des Stroms, der nicht in die Gasentladung fließt bewirkt gegenüber der Gasentladung eine zusätzliche Heizung der Elektrodenwendel, weshalb dieser Strom mit Zusatzheizstrom bezeichnet wird. Bei Entladungslampen mit wenig robusten Elektrodenwendeln muss dieser Zusatzheizstrom gering sein, um eine hohe Lebensdauer zu erreichen. Es ist also anzustreben, dass im Betrieb die Elektrodenwendeln im wesentlichen den Strom der Gasentladung führen. Der Zusatzheizstrom sollte im Vergleich zum Strom für die Gasentladung gering sein (maximal 20%).An electronic control gear mainly contains an alternating voltage generator, which provides an AC voltage from an oscillation frequency which is much higher than the frequency of the mains voltage. By suitable means the electronic control gear must start a connected discharge lamp and then manage their operation. The start of a discharge lamp with electrode coils can be divided into preheating and ignition. A current flows through the electrode coils to preheat them brings a temperature that allows a subsequent ignition that only a low one Brings damage to the electrode coil. Is the discharge lamp ignited, the discharge lamp begins to operate. In this state the Electricity for gas discharge in the lamp through the electrode coil connections fed. A current that flows in at an electrode coil connection divides now on to a part that flows into the gas discharge and a part that flows into the other Connection of the same electrode coil flows out again. The part of the stream that does not flow into the gas discharge causes an additional one compared to the gas discharge Heating the electrode coil, which is why this current is referred to as additional heating current becomes. Discharge lamps with less robust electrode filaments must this additional heating current must be low in order to achieve a long service life. It is So to strive for the fact that in operation the electrode coils essentially the current lead to gas discharge. The additional heating current should be compared to the current for the Gas discharge should be low (maximum 20%).

Stand der TechnikState of the art

In der Schrift EP0748146 (Krummel) wird zur Vorheizung ein Heiztransformator vorgeschlagen. In dessen Primärwicklung speist der Wechselspannungsgenerator den Vorheizstrom ein. Jede Elektrodenwendel ist an eine Sekundärwicklung des Heiztransformators angeschlossen. Durch einen Schalter kann der Stromfluss in der Primärwicklung des Heiztransformators unterbrochen werden. Damit kann erreicht werden, dass im Betrieb kein Zusatzheizstrom fließt und deshalb die Elektrodenwendeln im wesentlichen den Strom der Gasentladung führen. Diese Lösung benötigt jedoch einen Schalter und die dafür nötige Ansteuerung.In the document EP0748146 (Krummel) a heating transformer is used for preheating proposed. In its primary winding, the AC voltage generator feeds the Preheating current on. Each electrode coil is connected to a secondary winding of the heating transformer connected. A switch allows the current to flow in the primary winding of the heating transformer are interrupted. So that can be achieved that no additional heating current flows during operation and therefore the electrode coils essentially lead the flow of gas discharge. This solution is needed however, a switch and the necessary control.

Darstellung der ErfindungPresentation of the invention

Es ist Aufgabe der vorliegenden Erfindung, ein elektronisches Betriebsgerät gemäß dem Oberbegriff des Anspruchs 1 bereitzustellen, das keinen Schalter zum Abschalten der Vorheizung benötigt und somit kostengünstiger als die o. g. Lösung ist.It is an object of the present invention to provide an electronic operating device to provide the preamble of claim 1, which has no switch to turn off the preheating required and therefore cheaper than the above. Solution is.

Diese Aufgabe wird bei einem elektronischen Betriebsgerät mit den Merkmalen des Oberbegriffs des Anspruchs 1 durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst. Besonders vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen.This task is performed in an electronic control gear with the features of Preamble of claim 1 by the features of the characterizing part of Claim 1 solved. Particularly advantageous configurations can be found in the dependent ones Claims.

Erfindungsgemäß enthält das elektronische Betriebsgerät eine frequenzselektive Einrichtung, die eine Vorheizung der Elektrodenwendeln nur zulässt, falls sich die Schwingfrequenz des elektronischen Betriebsgeräts innerhalb eines engen Frequenzbandes befindet, das durch die frequenzselektive Einrichtung bestimmt wird. Bevorzugt wird die frequenzselektive Einrichtung durch einen Schwingkreis bestehend aus einer Induktivität L und einer Kapazität C gebildet. Die Schwingfrequenz des elektronischen Betriebsgeräts, bei der nun eine Vorheizung möglich ist, wird durch die Resonanzfrequenz fres dieses Schwingkreises vorgegeben, wobei gilt: ƒ res = 12π LC According to the invention, the electronic operating device contains a frequency-selective device which only permits preheating of the electrode filaments if the oscillation frequency of the electronic operating device is within a narrow frequency band, which is determined by the frequency-selective device. The frequency-selective device is preferably formed by an oscillating circuit consisting of an inductance L and a capacitance C. The oscillation frequency of the electronic control gear, at which preheating is now possible, is predetermined by the resonance frequency fres of this oscillation circuit, where: ƒ res = 1 2π LC

Exakt muss diese Frequenz natürlich nicht eingestellt werden. Vielmehr genügt es, dass sich die Schwingfrequenz des elektronischen Betriebsgeräts zur Vorheizung innerhalb eines engen Frequenzbandes um die Resonanzfrequenz fres befindet. In der Praxis hat sich gezeigt, dass ein Frequenzband von +/-10% um die Resonanzfrequenz ausreichend ist.Of course, this frequency does not have to be set exactly. Rather, it is enough that the oscillation frequency of the electronic control gear for preheating is within a narrow frequency band around the resonance frequency fres. In the Practice has shown that a frequency band of +/- 10% around the resonance frequency is sufficient.

Die Induktivität des Schwingkreises kann erfindungsgemäß durch die Primärinduktivität des Heiztransformators gebildet werden. D.h. die Induktivität, die die Primärwicklung des Heiztransformators darstellt, bildet zusammen mit einem in Serie geschaltetem Serienresonanzkondensator oder mit einem parallel geschaltetem Parallelresonanzkondensator den Schwingkreis. Prinzipiell kann der Schwingkreis auch auf der Sekundärseite des Heiztransformators gebildet werden. Da jedoch dort das Impedanzniveau niedriger ist, ergeben sich hohe Resonanzströme, die eine hohe Bauteilbelastung darstellen.According to the invention, the inductance of the resonant circuit can be determined by the primary inductance of the heating transformer are formed. That the inductance, which is the primary winding of the heating transformer, forms together with one connected in series Series resonance capacitor or with a parallel resonance capacitor connected in parallel the resonant circuit. In principle, the resonant circuit can also open the secondary side of the heating transformer. However, there the impedance level is lower, there are high resonance currents, which place a high load on the component represent.

Um eine ausreichend große Primärinduktivität bilden zu können, kann ein Heiztransformator mit einer losen Kopplung gewählt werden.In order to be able to form a sufficiently large primary inductance, a heating transformer can be used can be selected with a loose coupling.

Da der Wechselspannungsgenerator des elektronischen Betriebsgeräts oft eine rechteckförmige Spannung abgibt, kann der Schwingkreis auch durch Oberschwingungen angeregt werden. Da während des Betriebs der Lampe erfindungsgemäß kein Zusatzheizstrom fließen soll, darf bei der Betriebsfrequenz das elektronische Betriebsgerät nicht mit einer Oberschwingung den Schwingkreis anregen. Mit Betriebsfrequenz sei die Schwingfrequenz gemeint, bei der das elektronische Betriebsgerät während des Betriebs der Lampe arbeitet. Da eine Rechteckschwingung nur ungeradzahlige Oberschwingungen aufweist, wird erfindungsgemäß der Schwingkreis so ausgelegt, dass seine Resonanzfrequenz bei oder nahe der doppelten Betriebsfrequenz zu liegen kommt. Der erfinderische Gedanke wird dann noch realisiert, falls die Resonanzfrequenz fres des Schwingkreises mit einer Toleranz von +/-20% bei der doppelten Betriebsfrequenz liegt. Because the AC voltage generator of the electronic control gear is often rectangular The resonant circuit can also release voltage due to harmonics be stimulated. Since no additional heating current according to the invention during operation of the lamp the electronic control gear may flow at the operating frequency do not excite the resonant circuit with a harmonic. With operating frequency is meant the oscillation frequency at which the electronic control gear during operation of the lamp works. Because a square wave is only an odd number According to the invention, the resonant circuit is designed so that that its resonant frequency is at or near twice the operating frequency comes to lie. The inventive idea is then realized if the resonance frequency fres of the resonant circuit with a tolerance of +/- 20% in the double Operating frequency.

Beschreibung der ZeichnungenDescription of the drawings

Im folgenden soll die Erfindung anhand mehrerer Ausführungsbeispiele näher erläutert werden. Es zeigen:

  • Figur 1 ein elektronisches Betriebgerät mit angeschlossener Lampe und erfindungsgemäßem Parallelresonanzkondensator
  • Figur 2 ein weiteres Ausführungsbeispiel mit erfindungsgemäßem Parallelresonanzkondensator
  • Figur 3 ein weiteres Ausführungsbeispiel mit erfindungsgemäßem Parallelresonanzkondensator
  • Figur 4 ein weiteres Ausführungsbeispiel mit erfindungsgemäßem Serienresonanzkondensator
    • The invention will be explained in more detail below with the aid of several exemplary embodiments. Show it:
  • Figure 1 shows an electronic control gear with connected lamp and parallel resonance capacitor according to the invention
  • Figure 2 shows another embodiment with the parallel resonance capacitor according to the invention
  • Figure 3 shows another embodiment with the parallel resonance capacitor according to the invention
  • Figure 4 shows another embodiment with a series resonance capacitor according to the invention

    • Im folgenden sind Kondensatoren durch den Buchstaben C, Induktivitäten durch L, Übertragerwicklungen durch T jeweils gefolgt von einer Zahl, bezeichnet.Below are capacitors by the letter C, inductors by L, Transmitter windings denoted by T followed by a number.

    In Figur 1 ist ein elektronisches Betriebsgerät mit angeschlossener Entladungslampe LP dargestellt. Der Wechselspannungsgenerator G gibt an einem Ausgang A bezüglich eines Massepotenzials M eine Wechselspannung ab. Die Frequenz dieser Wechselspannung ist wesentlich höher als die Netzfrequenz. Zwischen dem Ausgang A und dem Massepotenzial M liegt die Reihenschaltung aus einem Koppelkondensator C11, einer Lampendrossel L11 und einem Zündkondensator C12, wobei C12 mit einem Anschluss auf dem Massepotenzial M liegt. C11 dient zum Abtrennen eines evtl. vorhandenen Gleichanteils der vom Wechselspannungsgenerators G gelieferten Wechselspannung. L11 dient zur Anpassung der Entladungslampe LP an den Wechselspannungsgenerator G. C12 dient in erster Linie zur Erzeugung einer Zündspannung für die Zündung der Entladungslampe LP. C12 kann auch zusammen mit L11 zur Anpassung der Entladungslampe LP an den Wechselspannungsgenerator G benutzt werden. Die Entladungslampe LP ist mit je einem Elektrodenwendelanschluss parallel zu C12 geschaltet. In Figure 1 is an electronic control gear with a connected discharge lamp LP shown. The AC voltage generator G gives an output A with respect from an earth potential M an AC voltage. The frequency of this AC voltage is much higher than the network frequency. Between exit A and the ground potential M is the series connection of a coupling capacitor C11, a lamp inductor L11 and an ignition capacitor C12, C12 with a connection is at ground potential M. C11 is used to disconnect one Possibly existing DC component of the one supplied by the AC voltage generator G. AC voltage. L11 is used to adapt the discharge lamp LP to the AC voltage generator G. C12 is primarily used to generate an ignition voltage for the ignition of the discharge lamp LP. C12 can also be used together with L11 used to adapt the discharge lamp LP to the AC voltage generator G. become. The discharge lamp LP is each with an electrode filament connection connected in parallel to C12.

    Zwischen dem Ausgang A und dem Massepotenzial M liegt die Reihenschaltung aus einem Trapezkondensator C13 und einem erfindungsgemäßem Schwingkreis. Der Schwingkreis besteht aus der Parallelschaltung eines Parallelresonanzkondensators C14 und der Primärwicklung T11 eines Heiztransformators. Der Trapezkondensator C13 dient zur Ankopplung des Schwingkreises an den Wechselstromgenerator G. Außerdem kann C13 zur Schalterentlastung von Schaltern, die im Wechselstromgenerator G enthalten sind, benutzt werden. Der Schwingkreis, bestehend aus C14 und T11, besitzt eine Resonanzfrequenz fres 1, die anhand der oben aufgeführten Formel berechnet werden kann. Für die in der Formel angegebene Induktivität L ist die an der Primärwicklung T11 des Heiztransformators wirksame Primärinduktivität einzusetzen. Erfindungsgemäß kann der Heiztransformator mit loser Kopplung ausgeführt werden, um für die Primärinduktivität genügend hohe Werte zu erzielen. Der Heiztransformator besitzt für jede Elektrodenwendel eine, mit diesen verbundene Sekundärwicklung T12 und T13. Die Resonanzfrequenz fres1 ist erfindungsgemäß so ausgelegt, dass sie nahe der doppelten Betriebsfrequenz liegt. Damit ist bei der Betriebsfrequenz die Impedanz des Schwingkreises im Vergleich zur Impedanz von C13 niederohmig. An der Primärwicklung T11 liegt deshalb nur eine kleine Spannung an und es wird nur ein vernachlässigbar kleiner Zusatzheizstrom in die Elektrodenwendeln eingespeist. Zum Vorheizen gibt der Wechselspannungsgenerator G erfindungsgemäß eine Spannung ab, deren Frequenz nahe der Resonanzfrequenz fres1 liegt. Damit fließt in der Primärwicklung T11 des Heiztransformators ein hoher Strom der zur Vorheizung in die Sekundärwicklungen T12 und T13 übertragen wird.The series connection is present between output A and ground potential M. a trapezoidal capacitor C13 and a resonant circuit according to the invention. The The resonant circuit consists of the parallel connection of a parallel resonance capacitor C14 and the primary winding T11 of a heating transformer. The trapezoidal capacitor C13 is used to couple the resonant circuit to the alternator G. C13 can also be used to relieve switches from switches used in the alternator G are used. The resonant circuit, consisting of C14 and T11, has a resonance frequency fres 1, based on the formula above can be calculated. For the inductance L indicated in the formula, the is on to use the primary winding T11 of the heating transformer effective primary inductance. According to the invention, the heating transformer can be designed with a loose coupling in order to achieve sufficiently high values for the primary inductance. The heating transformer has a secondary winding connected to each electrode coil T12 and T13. According to the invention, the resonance frequency fres1 is designed such that that it is close to twice the operating frequency. So that's at the operating frequency the impedance of the resonant circuit compared to the impedance of C13 low. There is therefore only a small voltage at the primary winding T11 and there is only a negligibly small additional heating current in the electrode filaments fed. For preheating, the AC voltage generator G according to the invention a voltage whose frequency is close to the resonance frequency fres1. Thus, a high current flows in the primary winding T11 of the heating transformer is transferred to the secondary windings T12 and T13 for preheating.

    Bei den Figuren 2 und 3 entfällt gegenüber Figur 1 der Trapezkondensator C13. Gegebenenfalls kann auch in der Figur 2 und 3 ein Trapezkondensator zwischen den Ausgang A und dem Massepotenzial M zur oben erwähnten Schalterentlastung geschaltet werden. Da bei den Figuren 2 und 3 der Schwingkreis T21/C23 bzw. T31/C33 nicht mit einem Rechteckstrom aus dem Wechselspannungsgenerator G, sondern, bedingt durch die Lampendrossel L21 bzw. L31, lediglich mit einem nahezu sinusförmigen Strom beaufschlagt wird, muss die Resonanzfrequenz fres1 des Schwingkreises T21/C23 bzw. T31/C33 nicht nahe der doppelten Betriebsfrequenz liegen. Compared to FIG. 1, the trapezoidal capacitor C13 is omitted in FIGS. Possibly can also in Figures 2 and 3, a trapezoidal capacitor between the Output A and the ground potential M switched to the switch relief mentioned above become. Since in FIGS. 2 and 3 the resonant circuit T21 / C23 or T31 / C33 not with a square wave current from the alternating voltage generator G, but, due to the lamp choke L21 or L31, only with an almost sinusoidal current is applied, the resonance frequency fres1 des Resonant circuit T21 / C23 or T31 / C33 not close to twice the operating frequency lie.

    Ein weiterer Unterschied zwischen Figur 1 und Figur 2 besteht darin, dass der Schwingkreis, bestehend aus T21 und C23, in Figur 2 in Serie zum Koppelkondensator C21 geschaltet ist. Des weiteren gelten die Ausführungen zu Figur 1 entsprechend.Another difference between Figure 1 and Figure 2 is that the Oscillating circuit, consisting of T21 and C23, in Figure 2 in series with the coupling capacitor C21 is switched. Furthermore, the explanations for FIG. 1 apply accordingly.

    Der Unterschied zwischen Figur 2 und Figur 3 besteht darin, dass der Schwingkreis, bestehend aus T31 und C33, in Figur 3 in Serie zum Zündkondensator C32 geschaltet ist. Auch in Figur 3 gelten entsprechend die Ausführungen zu Figur 1.The difference between Figure 2 and Figure 3 is that the resonant circuit, consisting of T31 and C33, in Figure 3 connected in series to the ignition capacitor C32 is. The statements relating to FIG. 1 also apply correspondingly in FIG. 3.

    In Figur 4 ist im Gegensatz zu den Figuren 1 bis 3 der erfindungsgemäße Schwingkreis nicht als Parallelschwingkreis, sondern als Serienschwingkreis ausgelegt. Er wird gebildet aus der Serienschaltung eines Serienresonanzkondensators C43 und der Primärwicklung des Heiztransformators T41. Bei der Betriebsfrequenz ist die Impedanz der Primärinduktivität an T41 gegenüber der Impedanz von C43 niederohmig. An der Pimärwicklung T41 liegt deshalb nur eine kleine Spannung an und es wird nur ein vernachlässigbar kleiner Zusatzheizstrom in die Elektrodenwendeln eingespeist. Im Übrigen gelten die Ausführungen zu Figur 1 entsprechend.In contrast to FIGS. 1 to 3, FIG. 4 shows the resonant circuit according to the invention not designed as a parallel resonant circuit, but as a series resonant circuit. He is formed from the series connection of a series resonance capacitor C43 and Primary winding of the heating transformer T41. At the operating frequency is the impedance the primary inductance at T41 compared to the impedance of C43. There is therefore only a small voltage on the primary winding T41 and it will only a negligibly small additional heating current is fed into the electrode filaments. Otherwise, the statements relating to FIG. 1 apply accordingly.

    Spezielle Vorteile eines Ausführungsbeispiels gegenüber einem anderen können nicht angegeben werden.Special advantages of one embodiment over another can not be specified.

    Die Ausführungsbeispiele sind mit jeweils einer Lampe bestückt. Die Erfindung kann jedoch mit Hilfe von Techniken, die einem Fachmann geläufig und aus dem Stand der Technik bekannt sind, auch auf Anwendungen mit mehreren Lampen übertragen werden.The exemplary embodiments are each equipped with a lamp. The invention However, using techniques that are known to a person skilled in the art and from which State of the art are also transferred to applications with multiple lamps become.

    Claims (11)

    Elektronisches Betriebsgerät zur Vorheizung, Zündung und zum Betrieb von Entladungslampen (LP), bei dem die Elektrodenwendeln von angeschlossenen Entladungslampen (LP) im Betrieb im wesentlichen den Strom der Gasentladung führen,
    dadurch gekennzeichnet, dass das elektronische Betriebsgerät eine frequenzselektive Einrichtung enthält, die eine Vorheizung von besagten Elektrodenwendeln nur zulässt, falls sich die Schwingfrequenz des elektronischen Betriebsgeräts innerhalb eines engen Frequenzbandes befindet, das durch die frequenzselektive Einrichtung bestimmt wird.    Electronic control gear for preheating, ignition and for operating discharge lamps (LP), in which the electrode filaments of connected discharge lamps (LP) essentially conduct the current of the gas discharge during operation,
    characterized in that the electronic operating device contains a frequency-selective device which only allows preheating of said electrode filaments if the oscillation frequency of the electronic operating device is within a narrow frequency band which is determined by the frequency-selective device.         Elektronisches Betriebsgerät nach Anspruch 1, dadurch gekennzeichnet, dass die frequenzselektive Einrichtung einen Heiztransformator (T11/T12/T13, T21/T22/T23, T31/T32/T33, T41/T42/T43) enthält.Electronic operating device according to claim 1, characterized in that the frequency-selective device contains a heating transformer (T11 / T12 / T13, T21 / T22 / T23, T31 / T32 / T33, T41 / T42 / T43). Elektronisches Betriebsgerät nach Anspruch 2, dadurch gekennzeichnet, dass der Heiztransformator (T11/T12/T13,T21/T22/T23, T31/T32/T33, T41/T42/T43) mit loser Kopplung ausgeführt ist.Electronic operating device according to claim 2, characterized in that the heating transformer (T11 / T12 / T13, T21 / T22 / T23, T31 / T32 / T33, T41 / T42 / T43) is designed with a loose coupling. Elektronisches Betriebsgerät nach Anspruch 2, dadurch gekennzeichnet, dass seriell zur Primärwicklung (T41) des Heiztransformators ein Serienresonanzkondensator (C43) geschaltet ist.Electronic operating device according to claim 2, characterized in that a series resonance capacitor (C43) is connected in series with the primary winding (T41) of the heating transformer. Elektronisches Betriebsgerät nach Anspruch 4, dadurch gekennzeichnet, dass der Serienresonanzkondensator (C43) zusammen mit der Primärinduktivität des Heiztransformators eine Resonanzfrequenz aufweist, die nahe dem doppelten Wert der Schwingfrequenz liegt, bei der das elektronisches Betriebsgerät während des Betriebs von angeschlossenen Entladungslampen (LP) schwingt.Electronic operating device according to claim 4, characterized in that the series resonance capacitor (C43) together with the primary inductance of the heating transformer has a resonance frequency which is close to twice the oscillation frequency at which the electronic operating device oscillates during the operation of connected discharge lamps (LP). Elektronisches Betriebsgerät nach Anspruch 2, dadurch gekennzeichnet, dass parallel zur Primärwicklung des Heiztransformators (T11, T21, T31) ein Parallelresonanzkondensator (C14, C23, C33) geschaltet ist.Electronic operating device according to claim 2, characterized in that a parallel resonance capacitor (C14, C23, C33) is connected in parallel with the primary winding of the heating transformer (T11, T21, T31). Elektronisches Betriebsgerät nach Anspruch 6, dadurch gekennzeichnet, dass der Parallelresonanzkondensator (C14, C23, C33) zusammen mit der Primärinduktivität des Heiztransformators eine Resonanzfrequenz aufweist, die nahe dem doppelten Wert der Schwingfrequenz liegt, bei der das elektronisches Betriebsgerät während des Betriebs von angeschlossenen Entladungslampen (LP) schwingt.Electronic operating device according to claim 6, characterized in that the parallel resonance capacitor (C14, C23, C33) together with the primary inductance of the heating transformer has a resonance frequency which is close to twice the oscillation frequency at which the electronic operating device during the operation of connected discharge lamps ( LP) swings. Elektronisches Betriebsgerät nach Anspruch 6, dadurch gekennzeichnet, dass die Primärwicklung (T31) des Heiztransformators in Serie zu einem Zündkondensator (C32) geschaltet ist.Electronic operating device according to claim 6, characterized in that the primary winding (T31) of the heating transformer is connected in series with an ignition capacitor (C32). Elektronisches Betriebsgerät nach Anspruch 6, dadurch gekennzeichnet, dass die Primärwicklung (T11) des Heiztransformators in Serie zu einem Trapezkondensator (C13) geschaltet ist.Electronic operating device according to claim 6, characterized in that the primary winding (T11) of the heating transformer is connected in series to a trapezoidal capacitor (C13). Elektronisches Betriebsgerät nach Anspruch 6, dadurch gekennzeichnet, dass die Primärwicklung (T21) des Heiztransformators in Serie zu einem Koppelkondensator (C21) geschaltet ist.Electronic operating device according to claim 6, characterized in that the primary winding (T21) of the heating transformer is connected in series to a coupling capacitor (C21). Verfahren zum Vorheizen, Zünden und Betreiben von Entladungslampen (LP) mit einem elektronischen Betriebgerät,
    dadurch gekennzeichnet, dass zum Vorheizen das elektronisches Betriebsgerät bei einer Schwingfrequenz arbeitet, die innerhalb eines Frequenzbandes liegt, in dem eine frequenzselektive Einrichtung des elektronischen Betriebsgeräts eine Vorheizung zulässt, zum Zünden das elektronisches Betriebsgerät bei einer Schwingfrequenz arbeitet, bei der an den Entladungslampen eine Spannung erzeugt wird, die zu einer Zündung der Entladungslampen führt, zum Betrieb der Entladungslampen das elektronisches Betriebsgerät bei einer Schwingfrequenz arbeitet, die innerhalb eines Frequenzbandes liegt, in dem die frequenzselektive Einrichtung des elektronischen Betriebsgeräts einen Zusatzheizstrom unterdrückt.     Method for preheating, igniting and operating discharge lamps (LP) with an electronic operating device,
    characterized in that for preheating the electronic operating device operates at an oscillation frequency which lies within a frequency band in which a frequency-selective device of the electronic operating device permits preheating, to ignite, the electronic operating device operates at an oscillation frequency at which a voltage is generated at the discharge lamps, which leads to an ignition of the discharge lamps, to operate the discharge lamps, the electronic operating device operates at an oscillation frequency which lies within a frequency band in which the frequency-selective device of the electronic operating device suppresses an additional heating current.
    EP01129891A 2001-01-22 2001-12-14 Device for electrode heating in discharge lamps Expired - Lifetime EP1225792B1 (en)

    Applications Claiming Priority (2)

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    DE10102837 2001-01-22
    DE10102837A DE10102837A1 (en) 2001-01-22 2001-01-22 Control gear for gas discharge lamps with shutdown of the filament heating

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    EP1225792A1 true EP1225792A1 (en) 2002-07-24
    EP1225792B1 EP1225792B1 (en) 2003-08-13

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    JP (1) JP2002260887A (en)
    KR (1) KR100826323B1 (en)
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    TW526681B (en) 2003-04-01
    KR20020062571A (en) 2002-07-26
    DE50100490D1 (en) 2003-09-18
    US6555970B2 (en) 2003-04-29
    CA2368725A1 (en) 2002-07-22
    CN100386003C (en) 2008-04-30
    US20020125807A1 (en) 2002-09-12
    ATE247373T1 (en) 2003-08-15
    KR100826323B1 (en) 2008-05-02
    AU777106B2 (en) 2004-09-30
    EP1225792B1 (en) 2003-08-13
    JP2002260887A (en) 2002-09-13
    AU1196102A (en) 2002-11-14
    CN1367639A (en) 2002-09-04
    DE10102837A1 (en) 2002-07-25

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