EP0378992A1 - Circuitry for driving discharge lamps - Google Patents

Circuitry for driving discharge lamps Download PDF

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Publication number
EP0378992A1
EP0378992A1 EP90100027A EP90100027A EP0378992A1 EP 0378992 A1 EP0378992 A1 EP 0378992A1 EP 90100027 A EP90100027 A EP 90100027A EP 90100027 A EP90100027 A EP 90100027A EP 0378992 A1 EP0378992 A1 EP 0378992A1
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EP
European Patent Office
Prior art keywords
circuit
relay
lamp
ptc thermistor
series
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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
EP90100027A
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German (de)
French (fr)
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EP0378992B1 (en
Inventor
Anton Zuchtriegel
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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
    • H05B41/26—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/05—Starting and operating circuit for fluorescent lamp

Definitions

  • the invention relates to a circuit arrangement for high-frequency operation of one or more low-pressure discharge lamps connected in series in accordance with the preamble of claim 1.
  • Such a circuit arrangement for igniting a low-pressure discharge lamp is listed in DE-OS 34 41 992.
  • the circuit arrangement includes a further capacitor in parallel with the PTC thermistor.
  • the PTC thermistor When a mains voltage is applied to the circuit arrangement, the PTC thermistor has a low resistance and thus enables a preheating current to flow through the two electrodes of the lamp.
  • the PTC thermistor is heated by the current flow and changes into a high-resistance state after a period of time characteristic of the respective PTC thermistor. This interrupts the preheating of the electrodes and the lamp can be ignited by the resonance circuit.
  • the PTC thermistor enables sufficient and quick preheating of the electrodes and reliable ignition of the lamp.
  • the PTC thermistor is heated for the entire duration of the lamp after the ignition. This results in relatively high energy losses due to the long burning times for fluorescent lamps.
  • the permanent heating of the PTC thermistor represents an additional thermal load on the circuit arrangement, which can lead to premature failure of a circuit part, in particular the PTC thermistor itself.
  • the object of the invention is to provide a circuit arrangement which prevents further heating of the PTC thermistor after the low-pressure discharge lamp or lamps have been ignited, so as to keep the power loss of the circuit arrangement low.
  • the number of circuit elements required for this shutdown should be as small as possible so that the circuit arrangement can also be easily integrated into small device housings.
  • the relay uses the switch to deactivate the PTC thermistor if the electrodes have been preheated sufficiently. So far, it has been known to control complex contacts, such as e.g. RC circuits to use as a timer.
  • the circuit arrangement according to the invention does not require such circuits, since the PTC thermistor to be switched off itself - by transition to the high-resistance state - serves as a time constant element for the normally closed contact relay.
  • the relay is connected in parallel with the PTC thermistor in the heating circuit via a rectifier. It is also in a the supply lines between the PTC thermistor and the AC input of the relay rectifier, a capacitor is used to set the relay switching voltage. Another capacitor in parallel with the DC output of the relay rectifier has the task of screening the DC voltage if low-noise direct current is required to operate the relay.
  • the PTC thermistor in multiple functions as a preheating element and time constant element, an optimal preheating time, a quick and glow phase-free lamp ignition and a high system efficiency are achieved in the circuit arrangement according to the invention.
  • the relay remains switched on during the operating period of the lamp or lamps, ie as long as the push-pull frequency generator oscillates.
  • the PTC thermistor cools down immediately after being switched off by the relay when starting the lamp. Thus, if the device is switched off within a few minutes and then switched on again, a new preheating with subsequent good ignition is guaranteed.
  • a circuit arrangement for operating a fluorescent lamp LP is shown.
  • the circuit includes a high-frequency filter 1, a rectifier arrangement 2, a smoothing capacitor C1 and a push-pull frequency generator with two alternating switching transistors T1, T2, emitter resistors R1, R2 and a control circuit 3.
  • the push-pull frequency generator is self-controlling, the control voltage being generated by a toroidal transformer TR with a primary winding is obtained in the operating circuit and one secondary winding each in the basic controls of the transistors T1, T2.
  • the circuit arrangement has a series resonance circuit with an inductance L1, a coupling capacitor C2 and a resonance capacitor C3.
  • the resonance inductance L1 and the coupling capacitor C2 are placed in series with the toroidal transformer TR in the operating circuit between the center tap M and the first electrode E1 of the lamp LP and the resonance capacitor C3 in the heating circuit of the lamp LP.
  • the second electrode E2 of the low-pressure discharge lamp LP is connected on the network side to the positive pole of the rectifier arrangement 2.
  • a PTC thermistor KL and a switch S of a relay RL are placed in the heating circuit.
  • a relay rectifier GL with its AC inputs is connected in parallel with the PTC thermistor KL and the switch S, a capacitor C4 also being placed in a supply line.
  • the DC outputs of the relay rectifier GL are connected to the relay RL, in which the switch S is integrated.
  • a capacitor C5 is connected in parallel with the DC output of the relay rectifier GL.
  • FIG. 2 shows a circuit arrangement according to the invention for operating two series connected Fluorescent lamps LP1, LP2 reproduced.
  • the structure of the basic circuit and the circuit for switching off the PTC thermistor KL correspond to the circuit shown in Figure 1, here the first electrode E1 of the first lamp LP1 with the center tap M and the second electrode E2 'of the second lamp LP2 with the positive pole of the rectifier arrangement 2 is connected.
  • the two middle electrodes E2 and E1 'of the lamp LP1 and lamp LP2 are combined to form a separate heating circuit which supplies the electrodes with current through a secondary winding L2' at the resonance inductor L1 '.
  • the heating circuit also includes a switch S 'integrated in the relay RL, which is opened by the relay RL. This makes it possible to use the relay RL, which is controlled by the PTC thermistor KL, to interrupt the preheating currents of all the electrodes at the same time if there is sufficient preheating to ignite the lamp.

Abstract

In a circuit arrangement for the radio-frequency operation of low- pressure discharge lamps (LP), a PTC thermistor (KL) is integrated in the network circuit adjacent to the resonant capacitor (C3), which thermistor provides suitable preheating of the electrodes (E1, E2). In addition, the circuit arrangement contains a relay (RL), with which the thermistor (KL) can be isolated from the circuit by means of a switch (S) in series with the thermistor (KL), the thermistor (KL) serving as a timer for controlling the relay (RL). In this way it is possible to eliminate further heating of the thermistor (KL) after a suitable preheating time of the electrodes (E1, E2) and thus to keep the power loss of the circuit arrangement small. …<IMAGE>…

Description

Die Erfindung betrifft eine Schaltungsanordnung zum hochfrequenten Betrieb einer bzw. mehrerer in Reihe geschalteter Niederdruckentladungslampen entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a circuit arrangement for high-frequency operation of one or more low-pressure discharge lamps connected in series in accordance with the preamble of claim 1.

In der DE-OS 34 41 992 ist eine solche Schaltungsan­ordnung zum Zünden einer Niederdruckentladungslampe aufgeführt. Die Schaltungsanordnung beinhaltet dabei einen weiteren Kondensator parallel zum Kaltleiter.Such a circuit arrangement for igniting a low-pressure discharge lamp is listed in DE-OS 34 41 992. The circuit arrangement includes a further capacitor in parallel with the PTC thermistor.

Bei Anlegen einer Netzspannung an die Schaltungsanord­nung ist der Kaltleiter niederohmig und ermöglicht so das Fließen eines Vorheizstromes durch die beiden Elektroden der Lampe. Durch den Stromfluß wird der Kaltleiter erwärmt und geht nach einer für den jewei­ligen Kaltleiter charakteristischen Zeitspanne in einen hochohmigen Zustand über. Dadurch wird die Vor­heizung der Elektroden unterbrochen und die Lampe kann durch den Resonanzkreis gezündet werden. Der Kalt­leiter ermöglicht so eine ausreichende und schnelle Vorheizung der Elektroden und eine sichere Zündung der Lampe.When a mains voltage is applied to the circuit arrangement, the PTC thermistor has a low resistance and thus enables a preheating current to flow through the two electrodes of the lamp. The PTC thermistor is heated by the current flow and changes into a high-resistance state after a period of time characteristic of the respective PTC thermistor. This interrupts the preheating of the electrodes and the lamp can be ignited by the resonance circuit. The PTC thermistor enables sufficient and quick preheating of the electrodes and reliable ignition of the lamp.

Nachteilig ist jedoch, daß der Kaltleiter nach der Zündung während der gesamten Brenndauer der Lampe geheizt wird. Daraus ergeben sich aufgrund der langen Brennzeiten bei Leuchtstofflampen verhältnismäßig hohe Verlustenergien. Außerdem stellt die Dauerheizung des Kaltleiters eine thermische Zusatzbelastung der Schaltungsanordnung dar, die zu einem vorzeitigen Ausfall eines Schaltungsteils, insbesondere des Kalt­leiters selbst führen kann.However, it is disadvantageous that the PTC thermistor is heated for the entire duration of the lamp after the ignition. This results in relatively high energy losses due to the long burning times for fluorescent lamps. In addition, the permanent heating of the PTC thermistor represents an additional thermal load on the circuit arrangement, which can lead to premature failure of a circuit part, in particular the PTC thermistor itself.

Aufgabe der Erfindung ist es, eine Schaltungsanordnung zu schaffen, die nach Zündung der Niederdruckentla­dungslampe bzw. -lampen eine weitere Heizung des Kaltleiters unterbindet, um so die Verlustleistung der Schaltungsanordnung gering zu halten. Die für diese Abschaltung benötigte Zahl an Schaltungselementen sollte möglichst klein sein, damit die Schaltungsan­ordnung auch in kleinen Gerätegehäusen problemlos integriert werden kann.The object of the invention is to provide a circuit arrangement which prevents further heating of the PTC thermistor after the low-pressure discharge lamp or lamps have been ignited, so as to keep the power loss of the circuit arrangement low. The number of circuit elements required for this shutdown should be as small as possible so that the circuit arrangement can also be easily integrated into small device housings.

Die Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Weitere vorteilhafte Ausge­staltungen der Schaltungsanordnung sind den Unteran­sprüchen zu entnehmen.The object is achieved by the characterizing features of claim 1. Further advantageous refinements of the circuit arrangement can be found in the subclaims.

Das Relais setzt mit Hilfe des Schalters den Kaltlei­ter außer Funktion, wenn eine ausreichende Vorheizung der Elektroden erfolgt ist. Bisher ist es bekannt, für die Ansteuerung eines Ruhekontakt-Relais, wie es hier vorliegt, aufwendige Schaltkreise, wie z.B. RC-Schal­tungen, als Zeitglied zu verwenden. Die erfindungsge­mäße Schaltungsanordnung benötigt solche Schaltkreise nicht, da der abzuschaltende Kaltleiter selbst - durch Übergang in den hochohmigen Zustand - als Zeitkon­stantenglied für das Ruhekontakt-Relais dient.The relay uses the switch to deactivate the PTC thermistor if the electrodes have been preheated sufficiently. So far, it has been known to control complex contacts, such as e.g. RC circuits to use as a timer. The circuit arrangement according to the invention does not require such circuits, since the PTC thermistor to be switched off itself - by transition to the high-resistance state - serves as a time constant element for the normally closed contact relay.

Zur Erzeugung der benötigten Gleichspannung ist das Relais über einen Gleichrichter parallel zum Kalt­leiter im Heizkreis geschaltet. Außerdem ist in eine der Zuleitungen zwischen Kaltleiter und Wechselstrom­eingang des Relais-Gleichrichters ein Kondensator ge­schaltet, der zur Einstellung der Relais-Schaltspan­nung dient. Ein weiterer Kondensator parallel zum Gleichstromausgang des Relais-Gleichrichters hat die Aufgabe, eine Siebung der Gleichspannung vorzunehmen, wenn zum Betrieb des Relais brummarmer Gleichstrom erforderlich ist.To generate the required DC voltage, the relay is connected in parallel with the PTC thermistor in the heating circuit via a rectifier. It is also in a the supply lines between the PTC thermistor and the AC input of the relay rectifier, a capacitor is used to set the relay switching voltage. Another capacitor in parallel with the DC output of the relay rectifier has the task of screening the DC voltage if low-noise direct current is required to operate the relay.

Bei Betrieb von mehreren in Reihe geschalteten Nieder­druckentladungslampen ist es für eine optimale Zündung notwendig, daß alle Elektroden vorgeheizt werden. Die nicht mit dem Mittenabgriff zwischen den beiden Tran­sistoren bzw. mit dem Plus- und/oder Minuspol verbun­denen Elektroden müssen daher eine zusätzliche Vor­heizung erfahren. Vorteilhaft geschieht dies durch einen eigenen Heizkreis, der diese Elektroden mitein­ander verbindet und in den zusätzlich eine Sekundär­wicklung an der Resonanzinduktivität integriert ist. Mit Hilfe eines weiteren Schalters in diesem zusätz­lichen Heizkreis, der ebenfalls im oben aufgeführten Ruhekontakt-Relais integriert ist, kann dann dieser Heizkreis gleichzeitig mit dem Heizkreis der äußeren Elektroden außer Funktion gesetzt werden.When operating several low-pressure discharge lamps connected in series, for optimal ignition it is necessary that all electrodes are preheated. The electrodes that are not connected to the center tap between the two transistors or to the positive and / or negative pole must therefore undergo additional preheating. This is advantageously done by a separate heating circuit which connects these electrodes to one another and in which a secondary winding on the resonance inductor is additionally integrated. With the help of another switch in this additional heating circuit, which is also integrated in the break contact relay listed above, this heating circuit can then be deactivated at the same time as the heating circuit of the outer electrodes.

Durch die Verwendung des Kaltleiters in Mehrfach­funktion als Vorheizglied und Zeitkonstantenglied wird bei der erfindungsgemäßen Schaltungsanordnung eine optimale Vorheizzeit, eine schnelle und glimmphasen­freie Lampenzündung und ein hoher Systemwirkungsgrad erzielt. Das Relais bleibt während der Betriebsdauer der Lampe bzw. Lampen eingeschaltet, d.h. solange der Gegentaktfrequenzgenerator schwingt. Der Kaltleiter kühlt sich sofort nach Abschaltung durch das Relais beim Lampenstart ab. Somit ist bei einer Geräteab­schaltung innerhalb einiger Minuten mit anschließender Wiedereinschaltung eine erneute Vorheizung mit nach­folgender guter Zündung gewährleistet. Diese Eigen­schaften ermöglichen somit auch den Einsatz der Schal­tungsanordnung in Kurzzeit-Betriebsanwendungen.By using the PTC thermistor in multiple functions as a preheating element and time constant element, an optimal preheating time, a quick and glow phase-free lamp ignition and a high system efficiency are achieved in the circuit arrangement according to the invention. The relay remains switched on during the operating period of the lamp or lamps, ie as long as the push-pull frequency generator oscillates. The PTC thermistor cools down immediately after being switched off by the relay when starting the lamp. Thus, if the device is switched off within a few minutes and then switched on again, a new preheating with subsequent good ignition is guaranteed. These properties therefore also enable the circuit arrangement to be used in short-term operating applications.

Die Schaltungsanordnung ist anhand der nachfolgenden Figuren näher veranschaulicht.

  • Figur 1 zeigt eine erfindungsgemäße Schaltungsan­ordnung zum Betrieb einer Niederdruckent­ladungslampe
  • Figur 2 zeigt eine erfindungsgemäße Schaltungsan­ordnung zum Betrieb von zwei in Reihe ge­schalteten Niederdruckentladungslampen
The circuit arrangement is illustrated in more detail with reference to the following figures.
  • FIG. 1 shows a circuit arrangement according to the invention for operating a low-pressure discharge lamp
  • FIG. 2 shows a circuit arrangement according to the invention for operating two low-pressure discharge lamps connected in series

Im Ausführungsbeispiel der Figur 1 ist eine Schal­tungsanordnung zum Betrieb einer Leuchtstofflampe LP wiedergegeben. Die Schaltung beinhaltet ein Hoch­frequenzfilter 1, eine Gleichrichteranordnung 2, einen Glättungskondensator C1 und einen Gegentaktfrequenz­generator mit zwei alternierend schaltenden Transi­storen T1, T2, Emitterwiderständen R1, R2 sowie einer Ansteuerschaltung 3. Der Gegentaktfrequenzgenerator ist selbststeuernd, wobei die Steuerspannung von einem Ringkerntrafo TR mit einer Primärwicklung im Betriebs­stromkreis und je einer Sekundärwicklung in den Basis­steuerungen der Transistoren T1, T2 erhalten wird. Außerdem weist die Schaltungsanordnung einen Serien­resonanzkreis mit einer Induktivität L1, einem Kopp­lungskondensator C2 und einem Resonanzkondensator C3 auf. Die Resonanzinduktivität L1 und der Kopplungs­ kondensator C2 sind in Reihe zum Ringkerntrafo TR in den Betriebsstromkreis zwischen den Mittenabgriff M und die erste Elektrode E1 der Lampe LP und der Reso­nanzkondensator C3 in den Heizkreis der Lampe LP gelegt. Die zweite Elektrode E2 der Niederdruckent­ladungslampe LP ist netzseitig mit dem Pluspol der Gleichrichteranordnung 2 verbunden.In the exemplary embodiment in FIG. 1, a circuit arrangement for operating a fluorescent lamp LP is shown. The circuit includes a high-frequency filter 1, a rectifier arrangement 2, a smoothing capacitor C1 and a push-pull frequency generator with two alternating switching transistors T1, T2, emitter resistors R1, R2 and a control circuit 3. The push-pull frequency generator is self-controlling, the control voltage being generated by a toroidal transformer TR with a primary winding is obtained in the operating circuit and one secondary winding each in the basic controls of the transistors T1, T2. In addition, the circuit arrangement has a series resonance circuit with an inductance L1, a coupling capacitor C2 and a resonance capacitor C3. The resonance inductance L1 and the coupling capacitor C2 are placed in series with the toroidal transformer TR in the operating circuit between the center tap M and the first electrode E1 of the lamp LP and the resonance capacitor C3 in the heating circuit of the lamp LP. The second electrode E2 of the low-pressure discharge lamp LP is connected on the network side to the positive pole of the rectifier arrangement 2.

Der genaue Schaltungsaufbau und die Funktionsweise einer solchen Schaltungsanordnung kann dem Buch "Elek­tronikschaltungen" von W. Hirschmann (Siemens AG), 1982, Seite 148 entnommen werden und soll hier nicht näher ausgeführt werden.The exact circuit structure and the mode of operation of such a circuit arrangement can be found in the book "Electronics Circuits" by W. Hirschmann (Siemens AG), 1982, page 148 and will not be described in more detail here.

In Reihe zum Resonanzkondensator C3 ist in den Heiz­kreis ein Kaltleiter KL und ein Schalter S eines Relais RL gelegt. Parallel zum Kaltleiter KL und zum Schalter S ist ein Relais-Gleichrichter GL mit seinen Wechselstromeingängen geschaltet, wobei in eine Zu­leitung außerdem ein Kondensator C4 gelegt ist. Die Gleichstromausgänge des Relais-Gleichrichters GL sind mit dem Relais RL verbunden, in das der Schalter S integriert ist. Außerdem ist parallel zum Gleichstrom­ausgang des Relais-Gleichrichters GL ein Kondensator C5 geschaltet.In series with the resonance capacitor C3, a PTC thermistor KL and a switch S of a relay RL are placed in the heating circuit. A relay rectifier GL with its AC inputs is connected in parallel with the PTC thermistor KL and the switch S, a capacitor C4 also being placed in a supply line. The DC outputs of the relay rectifier GL are connected to the relay RL, in which the switch S is integrated. In addition, a capacitor C5 is connected in parallel with the DC output of the relay rectifier GL.

Bei Anlegen einer Netzspannung an die Schaltungsan­ordnung fließt ein Vorheizstrom über die beiden Elek­troden El, E2 durch den Heizkreis. Der Kaltleiter KL ist zuerst niederohmig und geht aufgrund des Strom­flusses nach einer gewissen Vorheizzeit in den hoch­ohmigen Zustand über. Nun kann sich der Kondensator C4 aufladen, bis am Gleichspannungsausgang des Relais-­Gleichrichters GL die für das Relais RL erforderliche Schaltspannung vorliegt. Ist diese Spannung erreicht, so wird der Schalter S durch das Relais geöffnet und macht den Kaltleiter KL stromlos. Gleichzeitig wird die Lampe LP gezündet. Der Kaltleiter KL bleibt während der gesamten Brennzeit der Lampe LP abgeschal­tet, da das Relais RL durch Dauererregung seinen Ruhekontaktschalter S offenhält. Wird die Schaltungs­anordnung durch Abschalten der Netzspannung ausge­schaltet, so schließt sich auch der Ruhekontaktschal­ter S wieder. Wird die Schaltungsanordnung erneut ans Netz angeschlossen, so beginnt der Vorgang von vorn.When a mains voltage is applied to the circuit arrangement, a preheating current flows through the heating circuit via the two electrodes E1, E2. The PTC thermistor is initially low-resistance and, due to the current flow, changes to the high-resistance state after a certain preheating time. Now the capacitor C4 can charge until the DC voltage output of the relay rectifier GL requires the relay RL Switching voltage is present. If this voltage is reached, the switch S is opened by the relay and de-energizes the PTC thermistor KL. At the same time, the lamp LP is ignited. The PTC thermistor KL remains switched off during the entire burning time of the lamp LP, since the relay RL keeps its normally closed contact switch S open by permanent excitation. If the circuit arrangement is switched off by switching off the mains voltage, the normally closed contact switch S closes again. If the circuit arrangement is reconnected to the mains, the process begins again.

In der nachfolgenden Bestückungsliste sind die ver­wendeten Schaltungselemente für die erfindungsgemäße Schaltungsanordnung entsprechend Figur 1 zum Betrieb einer 58 W-Leuchtstofflampe an 220 V Wechselspannung zusammengestellt:
C1 : 10 µF/450 V-
T1, T2 : MJE 13007
R1, R2 : 0,39Ω
TR : Ringkern (10x6x4) primär 9 Windungen
sekundär je 3 Windungen
L1 : EF25, 1,4 mH
C2 : 100 nF/250 V∼
KL : Kaltleiter 65Ω (1,5 A)
GL : B 250, C 800
RL : 24 V DC/1400Ω , Ruhekontakt 2 A/250 V∼
C3 : 2,2 nF/630 V-
C4 : 0,47 nF/1000 V-
C5 : 0,1 µf/100 V-In the following equipment list, the circuit elements used for the circuit arrangement according to the invention in accordance with FIG. 1 for the operation of a 58 W fluorescent lamp on 220 V AC voltage are summarized:
C1: 10 µF / 450 V-
T1, T2: MJE 13007
R1, R2: 0.39Ω
TR: toroidal core (10x6x4) primarily 9 turns
secondary 3 turns each
L1: EF25, 1.4 mH
C2: 100 nF / 250 V∼
KL: PTC thermistor 65Ω (1.5 A)
GL: B 250, C 800
RL: 24 V DC / 1400Ω, normally closed contact 2 A / 250 V∼
C3: 2.2 nF / 630 V-
C4: 0.47 nF / 1000 V-
C5: 0.1 µf / 100 V-

In Figur 2 ist eine erfindungsgemäße Schaltungsanord­nung zum Betrieb von zwei in Reihe geschalteten Leuchtstofflampen LP1, LP2 wiedergegeben. Der Aufbau der Grundschaltung und des Schaltkreises für die Ab­schaltung des Kaltleiters KL entsprechen der in Figur 1 aufgeführten Schaltung, wobei hier die erste Elektrode E1 der ersten Lampe LP1 mit dem Mittenab­griff M und die zweite Elektrode E2′ der zweiten Lampe LP2 mit dem Pluspol der Gleichrichteranordnung 2 verbunden ist. Zusätzlich sind die beiden mittleren Elektroden E2 und E1′ der Lampe LP1 bzw. Lampe LP2 zu einem eigenen Heizkreis zusammengefaßt, der durch eine Sekundärwicklung L2′ an der Resonanzinduktivität L1′ die Elektroden mit Strom versorgt. Der Heizkreis beinhaltet außerdem einen im Relais RL integrierten Schalter S′, der durch das Relais RL geöffnet wird. Dadurch ist es möglich, mit dem Relais RL, das durch den Kaltleiter KL gesteuert wird, die Vorheizströme sämtlicher Elektroden gleichzeitig zu unterbrechen, wenn eine für die Zündung der Lampe ausreichende Vorheizung erfolgt ist.FIG. 2 shows a circuit arrangement according to the invention for operating two series connected Fluorescent lamps LP1, LP2 reproduced. The structure of the basic circuit and the circuit for switching off the PTC thermistor KL correspond to the circuit shown in Figure 1, here the first electrode E1 of the first lamp LP1 with the center tap M and the second electrode E2 'of the second lamp LP2 with the positive pole of the rectifier arrangement 2 is connected. In addition, the two middle electrodes E2 and E1 'of the lamp LP1 and lamp LP2 are combined to form a separate heating circuit which supplies the electrodes with current through a secondary winding L2' at the resonance inductor L1 '. The heating circuit also includes a switch S 'integrated in the relay RL, which is opened by the relay RL. This makes it possible to use the relay RL, which is controlled by the PTC thermistor KL, to interrupt the preheating currents of all the electrodes at the same time if there is sufficient preheating to ignite the lamp.

Claims (5)

1. Schaltungsanordnung zum hochfrequenten Betrieb einer Niederdruckentladungslampe (LP) bzw. mehrerer in Reihe geschalteter Niederdruckentladungslampen (LP1, LP2), wobei die Schaltung folgende Merkmale aufweist:
- eine Gleichrichteranordnung (2);
- einen mit dem Gleichstromausgang der Gleichrichter­anordnung (2) verbundenen Gegentaktfrequenzgenerator mit zwei alternierend schaltenden Transistoren (T1, T2), einer Ansteuerschaltung (3) und einem Glät­tungskondensator (C1), wobei ein Mittenabgriff (M) zwischen den beiden Transistoren vorgesehen ist;
- Anschlußleitungen für die Niederdruckentladungslampe (LP) bzw. -lampen (LP1, LP2), wobei eine Leitung die erste Elektrode (E1) der Lampe (LP) bzw. der ersten Lampe (LP1) mit dem Mittenabgriff (M) zwischen den beiden Transistoren (T1, T2) und eine weitere Lei­tung die zweite Elektrode (E2; E2′) der Lampe (LP) bzw. der letzten Lampe (LP2) mit dem Plus- und/oder Minuspol der Gleichrichteranordnung (2) verbindet;
- einen Serienresonanzkreis, bestehend aus Resonanz­induktivität (L1, L1′), Kopplungskondensator (C2) und Resonanzkapazität (C3), wobei die Resonanzinduk­tivität (L1, L1′) und der Kopplungskondensator (C2) in Reihe zwischen den Mittenabgriff (M) und die erste Elektrode (E1) der Lampe (LP) bzw. der ersten Lampe (LP1) und die Resonanzkapazität (C3) in den Heizkreis parallel zur Lampe (LP) bzw. zu den Lampen (LP1, LP2) geschaltet ist,
- sowie einem Kaltleiter (KL) in Reihe zum Resonanz­kondensator (C3) im Heizkreis,
dadurch gekennzeichnet, daß die Schaltungsanordnung ein Relais (RL) beinhaltet, mit dem mittels eines Schalters (S) in Reihe zum Kaltleiter (KL) im Heiz­kreis der Kaltleiter (KL) von der Schaltung abgetrennt werden kann, wobei der Kaltleiter (KL) gleichzeitig als Zeitglied für die Steuerung des Relais (RL) dient.1. Circuit arrangement for the high-frequency operation of a low-pressure discharge lamp (LP) or a plurality of low-pressure discharge lamps (LP1, LP2) connected in series, the circuit having the following features:
- A rectifier arrangement (2);
- A push-pull frequency generator connected to the direct current output of the rectifier arrangement (2) with two alternating switching transistors (T1, T2), a control circuit (3) and a smoothing capacitor (C1), a center tap (M) being provided between the two transistors;
- Connection lines for the low-pressure discharge lamp (LP) or lamps (LP1, LP2), with one line the first electrode (E1) of the lamp (LP) or the first lamp (LP1) with the center tap (M) between the two transistors (T1, T2) and a further line connects the second electrode (E2; E2 ') of the lamp (LP) or the last lamp (LP2) to the positive and / or negative pole of the rectifier arrangement (2);
- A series resonance circuit consisting of resonance inductance (L1, L1 '), coupling capacitor (C2) and resonance capacitance (C3), the resonance inductance (L1, L1') and the coupling capacitor (C2) in series between the center tap (M) and the first Electrode (E1) of the lamp (LP) or the first lamp (LP1) and the resonance capacitance (C3) in the Heating circuit is connected in parallel to the lamp (LP) or to the lamps (LP1, LP2),
- and a PTC thermistor (KL) in series with the resonance capacitor (C3) in the heating circuit,
characterized in that the circuit arrangement includes a relay (RL) with which the PTC thermistor (KL) can be separated from the circuit by means of a switch (S) in series with the PTC thermistor (KL) in the heating circuit, the PTC thermistor (KL) being used simultaneously as Timer for controlling the relay (RL) is used. 2. Schaltungsanordnung nach Anspruch 1, dadurch ge­kennzeichnet, daß die Stromanschlüsse des Relais (RL) mit dem Gleichspannungsausgang eines Relais-Gleich­richters (GL) verbunden sind und der Relais-Gleich­richter (GL) mit seinen Wechselstromeingängen paral­lel zum Kaltleiter (KL) geschaltet ist.2. Circuit arrangement according to claim 1, characterized in that the power connections of the relay (RL) are connected to the DC voltage output of a relay rectifier (GL) and the relay rectifier (GL) is connected in parallel with the PTC thermistor (KL) with its AC inputs. 3. Schaltungsanordnung nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß in eine der beiden Wechselstromanschlußleitungen zwischen Kaltleiter (KL) und Relais-Gleichrichter (GL) ein Kondensator (C4) geschaltet ist.3. Circuit arrangement according to claim 1 and / or 2, characterized in that a capacitor (C4) is connected in one of the two AC connecting lines between the PTC thermistor (KL) and relay rectifier (GL). 4. Schaltungsanordnung nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß paral­lel zum Gleichstromausgang des Relais-Gleichrichters (GL) ein Kondensator (C5) geschaltet ist.4. Circuit arrangement according to one or more of claims 1 to 3, characterized in that a capacitor (C5) is connected in parallel with the DC output of the relay rectifier (GL). 5. Schaltungsanordnung nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß bei Betrieb von mehreren in Reihe geschalteten Nieder­ druckentladungslampen (LP1, LP2) die Elektroden (E2, E1′), die nicht mit dem Mittenabgriff (M) bzw. dem Plus- und/oder Minuspol verbunden sind, in Reihe mit einer Sekundärwicklung (L2′) an der Resonanzinduktivi­tät (L1′) zu einem weiteren Heizkreis verschaltet sind, und in diesem Heizkreis ein Schalter (S′) inte­griert ist, durch den mittels des Relais (RL) der weitere Heizkreis unterbrochen werden kann.5. Circuit arrangement according to one or more of claims 1 to 4, characterized in that when operating a plurality of low connected in series pressure discharge lamps (LP1, LP2) the electrodes (E2, E1 ′), which are not connected to the center tap (M) or the positive and / or negative pole, in series with a secondary winding (L2 ′) at the resonance inductor (L1 ′ ) are connected to another heating circuit, and a switch (S ') is integrated in this heating circuit, through which the further heating circuit can be interrupted by means of the relay (RL).
EP90100027A 1989-01-16 1990-01-02 Circuitry for driving discharge lamps Expired - Lifetime EP0378992B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3901111 1989-01-16
DE3901111A DE3901111A1 (en) 1989-01-16 1989-01-16 CIRCUIT ARRANGEMENT FOR THE OPERATION OF DISCHARGE LAMPS

Publications (2)

Publication Number Publication Date
EP0378992A1 true EP0378992A1 (en) 1990-07-25
EP0378992B1 EP0378992B1 (en) 1993-08-25

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EP90100027A Expired - Lifetime EP0378992B1 (en) 1989-01-16 1990-01-02 Circuitry for driving discharge lamps

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US (1) US5027033A (en)
EP (1) EP0378992B1 (en)
JP (1) JP2846025B2 (en)
DE (2) DE3901111A1 (en)

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WO1991007070A1 (en) * 1989-10-26 1991-05-16 Skyline Holding Ag Preheater circuit for fluorescent lamps
EP0693864A3 (en) * 1994-07-21 1997-12-03 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit for operating one or more lour pressure discharge lamps
EP1424880A2 (en) * 2002-11-13 2004-06-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Device for operating discharge lamps
EP1601237A2 (en) 2004-05-26 2005-11-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Ballast with control circuit for the permanent operation of a discharge lamp

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DE4005850A1 (en) * 1990-02-23 1991-08-29 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Gas discharge lamp operating circuit - uses cold conductor for switching between pre-heating and lamp ignition
DE4025938A1 (en) * 1990-08-16 1992-02-20 Diehl Gmbh & Co CIRCUIT ARRANGEMENT FOR THE OPERATION OF A FLUORESCENT LAMP
DE4119775A1 (en) * 1991-06-15 1992-12-17 Vossloh Schwabe Gmbh CONTROL UNIT WITH CONTROLLED HEATING TIME
DE4121009C2 (en) * 1991-06-21 1994-01-13 Prolux Maschinenbau Gmbh Circuit arrangement for operating a discharge lamp
DE4140557A1 (en) * 1991-12-09 1993-06-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh CIRCUIT ARRANGEMENT FOR OPERATING ONE OR MORE LOW-PRESSURE DISCHARGE LAMPS
US5444333A (en) * 1993-05-26 1995-08-22 Lights Of America, Inc. Electronic ballast circuit for a fluorescent light
US5483125A (en) * 1993-12-06 1996-01-09 General Electric Company Ballast circuit for a gas discharge lamp having a cathode pre-heat arrangement
JPH07161483A (en) * 1993-12-13 1995-06-23 U R D:Kk Fluorescent lamp device
DE9404469U1 (en) * 1994-03-16 1994-11-10 Trilux Lenze Gmbh & Co Kg Multi-lamp ballast for discharge lamps
US5656891A (en) * 1994-10-13 1997-08-12 Tridonic Bauelemente Gmbh Gas discharge lamp ballast with heating control circuit and method of operating same
DE19524386B4 (en) * 1995-07-04 2005-10-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Rod-shaped electric light
BE1009717A3 (en) * 1995-10-20 1997-07-01 Philips Electronics Nv Shifting.
DE10125510A1 (en) * 2001-05-23 2002-12-05 Innolux Gmbh fluorescent lamp circuit
US7586268B2 (en) * 2005-12-09 2009-09-08 Lutron Electronics Co., Inc. Apparatus and method for controlling the filament voltage in an electronic dimming ballast
CN101206709B (en) * 2006-12-22 2010-06-23 晨星半导体股份有限公司 Reading state hold circuit and reading state hold method
DE102007054806A1 (en) * 2007-11-16 2009-05-20 Tridonicatco Schweiz Ag Operating circuit for series-connected lamps, in particular HID gas discharge lamps

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
WO1991007070A1 (en) * 1989-10-26 1991-05-16 Skyline Holding Ag Preheater circuit for fluorescent lamps
AU638068B2 (en) * 1989-10-26 1993-06-17 Skyline Holding Ag Preheater circuit for fluorescent lamps
EP0693864A3 (en) * 1994-07-21 1997-12-03 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit for operating one or more lour pressure discharge lamps
EP1424880A2 (en) * 2002-11-13 2004-06-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Device for operating discharge lamps
EP1424880A3 (en) * 2002-11-13 2008-03-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Device for operating discharge lamps
EP1601237A2 (en) 2004-05-26 2005-11-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Ballast with control circuit for the permanent operation of a discharge lamp
EP1601237A3 (en) * 2004-05-26 2009-07-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Ballast with control circuit for the permanent operation of a discharge lamp

Also Published As

Publication number Publication date
DE3901111A1 (en) 1990-07-19
EP0378992B1 (en) 1993-08-25
JPH02227998A (en) 1990-09-11
US5027033A (en) 1991-06-25
JP2846025B2 (en) 1999-01-13
DE59002409D1 (en) 1993-09-30

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