EP0471331A1 - Circuit assembly for operating a fluorescent lamp - Google Patents

Circuit assembly for operating a fluorescent lamp Download PDF

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Publication number
EP0471331A1
EP0471331A1 EP91113562A EP91113562A EP0471331A1 EP 0471331 A1 EP0471331 A1 EP 0471331A1 EP 91113562 A EP91113562 A EP 91113562A EP 91113562 A EP91113562 A EP 91113562A EP 0471331 A1 EP0471331 A1 EP 0471331A1
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EP
European Patent Office
Prior art keywords
brightness
fluorescent lamp
control circuit
switch
circuit arrangement
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
EP91113562A
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German (de)
French (fr)
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EP0471331B1 (en
Inventor
Gottfried Stockinger
Jürgen Ludwig
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Diehl Verwaltungs Stiftung
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Diehl GmbH and Co
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Publication of EP0471331A1 publication Critical patent/EP0471331A1/en
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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
    • H05B41/20—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 having no starting switch
    • H05B41/23—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 having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/232—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 having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps
    • H05B41/2325—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 having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps provided with pre-heating electrodes
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor

Definitions

  • the invention relates to a circuit arrangement for operating a fluorescent lamp on an AC network, for example an aircraft electrical system.
  • the object of the invention is to propose a circuit arrangement of the type mentioned, which avoids unwanted, visible fluctuations in brightness.
  • the above object is achieved in a circuit arrangement of the aforementioned type with a switch located between two lamp electrodes, which can be switched by means of a control circuit which periodically switches the switch at brightness-shifted switching times for brightness control, in that a measuring element is connected to the control circuit, which depending on deviations in the mains frequency and / or the mains voltage and / or the brightness of setpoints, the switching times of the control circuit are shifted in such a way that brightness fluctuations in the visible range are compensated for.
  • Another circuit arrangement according to the invention of the type mentioned at the outset with a choke connected upstream of the fluorescent lamp is characterized in that the inductance of the choke is adjustable and that a regulator is provided for setting the inductance, which uses a measuring element to deviate from the mains frequency and / or the mains voltage and / or the brightness of setpoints and adjusts the inductance to compensate for visible fluctuations in brightness.
  • a circuit arrangement of the type mentioned a switch for switching off the fluorescent lamp and a control circuit is provided which monitors the ignition attempts and the lighting of the fluorescent lamp and which opens the switch after a certain number of ignition attempts, or after a certain time after the first ignition attempt, if the fluorescent lamp has not ignited after these ignition attempts.
  • This circuit arrangement alone solves the problem.
  • This circuit arrangement can also be used in conjunction with one of the circuit arrangements mentioned above. This circuit arrangement ensures that a used fluorescent lamp is switched off automatically after a few start attempts without the other fluorescent lamps of the lighting being affected.
  • a fluorescent lamp (1) has a fluorescent tube (2) with two lamp electrodes (3, 4).
  • the lamp electrodes (3, 4) are connected to an AC voltage source (6), in particular an aircraft electrical system, via a passive or active ballast (5).
  • the ballast (5) is a choke.
  • the ballast (5) is an adjustable choke.
  • the poles of the lamp electrodes (3, 4) facing away from the AC voltage source (6) are connected to one another via a switch (7). This can be controlled by a control circuit (8).
  • the control circuit (8) enables brightness control of the fluorescent lamp (1) (dimming operation) in a manner known per se.
  • the control circuit (8) has a phase shifter (9). For example, it opens the switch (7) more or less out of phase with respect to the zero crossing in each half-wave of the AC line voltage. Opening the switch (7) creates an ignition pulse that ignites the fluorescent tube (2).
  • FIG. 3 shows a time diagram of the current flowing through the ballast (5).
  • the switching times at which the switch (7) is switched are designated t1 and t2.
  • the switch (7) is opened at times t1.
  • the switching times t1 are therefore the ignition times.
  • At times t2 the switch (7) is closed.
  • the switching times t2 are therefore the deletion times.
  • the lamp brightness depends on the current-time area between the switching times t1 and t2.
  • the brightness control or brightness regulation can accordingly be carried out by shifting the ignition times t1 and / or shifting the extinguishing times t2 (cf. FIG. 3).
  • a measuring element (10) is connected to the control circuit (8). This detects deviations in the network frequency and / or the network voltage and accordingly shifts the switching times t1 or t2 of the control circuit (8). This compensates for annoying fluctuations in brightness.
  • the measuring element (10) can also be formed by a brightness sensor which detects the brightness of the fluorescent lamp (1). In the event of fluctuations in the brightness, it shifts the switching times of the control circuit (8) so that the brightness remains constant. There is a brightness control.
  • additional heating circuits are provided for the lamp electrodes (3, 4) and are connected to the AC voltage source (6) bypassing the ballast (5).
  • the adjustable throttle (5) is connected to a controller (13). This is connected to the measuring element (10) and the AC voltage source (6).
  • the controller (13) detects deviations in the mains frequency and / or the mains voltage and / or the brightness. It adjusts the inductance of the choke (5) so that the choke current compensates for the brightness fluctuations.
  • the measuring element (10) is, for example, an ammeter which measures the current flowing through the ballast (5). Since the lamp brightness depends on the current time area between the switching times t1 and t2 and the control circuit (8) generates it, the brightness can be readjusted. Deviations in the mains frequency and / or the mains voltage lead to a change in the current flowing through the ballast (5), which in itself would lead to a change in the brightness. This effect can be corrected by shifting the switching times t1 and / or t2.
  • an additional switch (14) is provided, with which flickering, that is to say used-up, fluorescent lamps can be switched off.
  • the switch (14) is switched by the control circuit (8).
  • the measuring element (10) formed by an ammeter measures the current each time the switch (7) is opened, that is to say after the ignition pulse. If a current flows, this is a sign that the fluorescent lamp (1) has been lit. The switch (14) remains closed. If, on the other hand, no current is flowing, this is a sign that the ignition pulse has not led to the ignition of the fluorescent lamp (1). If the fluorescent lamp (1) is not ignited after one or more ignition pulses, the control circuit (8) opens the switch (14), whereby the fluorescent lamp (1) is forcibly switched off.
  • a voltage meter is provided as the measuring element (10), which detects the voltage between the lamp electrodes (3, 4) on the mains side. If the switch (7) is open and the fluorescent lamp (1) still does not light up, the voltage measured by the measuring element (10) deviates from the voltage which arises when the fluorescent lamp (1) shines. This is a sign that the fluorescent lamp (1) has not ignited despite one or more ignition attempts. The control circuit (8) then opens the switch (14).
  • a brightness sensor (15) is provided, which is connected to the control circuit (8). If the fluorescent lamp (1) does not light up despite one or more ignition attempts, then the switch (14) is opened again by the control circuit (8).

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  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

In a circuit assembly for operating a fluorescent lamp from an AC network, for example an aircraft on-board network, a switch (7), which a control circuit (8) periodically open at phase-shifted switching times for brightness control, is connected between two lamp electrodes (3, 4). In order to compensate for undesired brightness fluctuations, connected to the control circuit (8) is a measuring element (10) which shifts the switching times of the control circuit (8) suitably as a function of deviations from the network frequency and/or from the network voltage and/or of the brightness from nominal values. <IMAGE>

Description

Die Erfindung betrifft eine Schaltungsanordnung für den Betrieb einer Leuchtstofflampe an einem Wechselstromnetz, beispielsweise einem Flugzeug-Bordnetz.The invention relates to a circuit arrangement for operating a fluorescent lamp on an AC network, for example an aircraft electrical system.

Eine derartige Schaltungsanordnung ist in der DE 33 27 189 A1 beschrieben. Zwischen den Lampenelektroden liegt ein Schalter, den eine Steuerschaltung zum Dimmen der Helligkeit schaltet. Durch öffnen des Schalters in jeder Netzhalbwelle entstehen phasenverschobene Zündspannungsimpulse. Bei geschlossenem Schalter fließt ein Heizstrom über die Lampenelektroden.Such a circuit arrangement is described in DE 33 27 189 A1. There is a switch between the lamp electrodes, which is switched by a control circuit for dimming the brightness. Opening the switch in each mains half-wave results in phase-shifted ignition voltage pulses. When the switch is closed, a heating current flows through the lamp electrodes.

Eine ähnliche Schaltungsanordnung ist in der CH-PS 595 036 beschrieben.A similar circuit arrangement is described in CH-PS 595 036.

Bei den bekannten Schaltungsanordnungen führen Netzspannungsschwankungen und Netzfrequenzschwankungen zu unerwünschten Helligkeitsschwankungen der Leuchtstofflampe. Diese machen sich insbesondere dann bemerkbar, wenn die Wiederholungsrate der Schwankungen zwischen 0 und etwa 50/s liegt. Solche Helligkeitsschwankungen sind insbesondere in Fluggastzellen unangenehm. Außerdem treten Helligkeitsschwankungen auch durch verbrauchte Leuchtstofflampen auf. Diese flackern ständig, da die Startversuche nicht zum Zünden führen.In the known circuit arrangements, mains voltage fluctuations and mains frequency fluctuations lead to undesirable fluctuations in brightness of the fluorescent lamp. These are particularly noticeable when the repetition rate of the fluctuations is between 0 and about 50 / s. Such fluctuations in brightness are particularly unpleasant in passenger compartments. In addition, fluctuations in brightness also occur due to used fluorescent lamps. These flicker constantly because the start attempts do not lead to ignition.

Aufgabe der Erfindung ist es, eine Schaltungsanordnung der eingangs genannten Art vorzuschlagen, die unerwünschte, sichtbare Helligkeitsschwankungen vermeidet.The object of the invention is to propose a circuit arrangement of the type mentioned, which avoids unwanted, visible fluctuations in brightness.

Erfindungsgemäß ist obige Aufgabe bei einer Schaltungsanordnung der eingangs genannten Art mit einem zwischen zwei Lampenelektroden liegenden Schalter, der mittels einer Steuerschaltung schaltbar ist, die zur Helligkeitssteuerung den Schalter in phasenverschobenen Schaltzeitpunkten periodisch schaltet, dadurch gelöst, daß an die Steuerschaltung ein Meßglied angeschlossen ist, das in Abhängigkeit von Abweichungen der Netzfrequenz und/oder der Netzspannung und/oder der Helligkeit von Sollwerten die Schaltzeitpunkte der Steuerschaltung so verschiebt, daß im sichtbaren Bereich liegende Helligkeitsschwankungen ausgeglichen werden.According to the invention, the above object is achieved in a circuit arrangement of the aforementioned type with a switch located between two lamp electrodes, which can be switched by means of a control circuit which periodically switches the switch at brightness-shifted switching times for brightness control, in that a measuring element is connected to the control circuit, which depending on deviations in the mains frequency and / or the mains voltage and / or the brightness of setpoints, the switching times of the control circuit are shifted in such a way that brightness fluctuations in the visible range are compensated for.

Dadurch ist erreicht, daß sich Schwankungen der Spannung und/oder der Frequenz des Netzes nicht auf die Beleuchtung auswirken können. Dies ist insbesondere bei Flugzeugen wichtig, da dort in bestimmten Situationen solche Schwankungen auftreten können und die Fluggäste nicht durch Helligkeitsschwankungen der Beleuchtung beunruhigt werden sollen.This ensures that fluctuations in the voltage and / or the frequency of the network can not affect the lighting. This is particularly important in the case of aircraft, since such fluctuations can occur in certain situations and the passengers should not be disturbed by fluctuations in the brightness of the lighting.

Eine andere erfindungsgemäße Schaltungsanordnung der eingangs genannten Art mit einer der Leuchtstofflampe vorgeschalteten Drossel ist dadurch gekennzeichnet, daß die Induktivität der Drossel einstellbar ist und daß zur Einstellung der Induktivität ein Regler vorgesehen ist, der mittels eines Meßgliedes Abweichungen der Netzfrequenz und/oder der Netzspannung und/oder der Helligkeit von Sollwerten erfaßt und die Induktivität zum Ausgleich von sichtbaren Helligkeitsschwankungen nachstellt. Auch mit dieser Schaltungsanordnung lassen sich die oben genannten Vorteile erreichen.Another circuit arrangement according to the invention of the type mentioned at the outset with a choke connected upstream of the fluorescent lamp is characterized in that the inductance of the choke is adjustable and that a regulator is provided for setting the inductance, which uses a measuring element to deviate from the mains frequency and / or the mains voltage and / or the brightness of setpoints and adjusts the inductance to compensate for visible fluctuations in brightness. The above-mentioned advantages can also be achieved with this circuit arrangement.

Um Helligkeitsschwankungen zu vermeiden, die auf dem Flackern verbrauchter Leuchtstofflampen beruhen, ist bei einer Schaltungsanordnung der eingangs genannten Art ein Schalter zum Abschalten der Leuchtstofflampe und eine Steuerschaltung vorgesehen, die die Zündversuche und das Leuchten der Leuchtstofflampe überwacht und die nach einer gewissen Anzahl von Zündversuchen, oder nach einer bestimmten Zeit nach dem ersten Zündversuch, den Schalter öffnet, wenn die Leuchtstofflampe nach diesen Zündversuchen nicht gezündet hat.In order to avoid fluctuations in brightness due to the flickering of used fluorescent lamps, a circuit arrangement of the type mentioned, a switch for switching off the fluorescent lamp and a control circuit is provided which monitors the ignition attempts and the lighting of the fluorescent lamp and which opens the switch after a certain number of ignition attempts, or after a certain time after the first ignition attempt, if the fluorescent lamp has not ignited after these ignition attempts.

Auch diese Schaltungsanordnung allein löst die Aufgabe. Diese Schaltungsanordnung kann auch in Verbindung mit einer der bei den vorgenannten Schaltungsanordnungen eingesetzt werden. Durch diese Schaltungsanordnung ist erreicht, daß eine verbrauchte Leuchtstofflampe nach einigen Startversuchen selbsttätig abgeschaltet wird, ohne daß davon die anderen Leuchtstofflampen der Beleuchtung betroffen sind.This circuit arrangement alone solves the problem. This circuit arrangement can also be used in conjunction with one of the circuit arrangements mentioned above. This circuit arrangement ensures that a used fluorescent lamp is switched off automatically after a few start attempts without the other fluorescent lamps of the lighting being affected.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der folgenden Beschreibung von Ausführungsbeispielen.
In der Zeichnung zeigen:

  • Figur 1 eine Schaltung einer Leuchtstofflampe mit Helligkeitssteuerung,
  • Figur 2 eine weitere Schaltung einer Leuchtstofflampe mit Helligkeitssteuerung,
  • Figur 3 ein Stromdiagramm,
  • Figur 4 eine Schaltung einer Leuchtstofflampe mit verstellbarer Drossel,
  • Figur 5 eine weitere Schaltung einer Leuchtstofflampe mit verstellbarer Drossel,
  • Figur 6 eine Schaltung einer Leuchtstofflampe zur Vermeidung des Flackerns,
  • Figur 7 eine Alternative zu Figur 6 und
  • Figur 8 eine weitere Alternative zu Figur 6.
Advantageous embodiments of the invention result from the following description of exemplary embodiments.
The drawing shows:
  • 1 shows a circuit of a fluorescent lamp with brightness control,
  • FIG. 2 shows a further circuit of a fluorescent lamp with brightness control,
  • FIG. 3 shows a current diagram,
  • FIG. 4 shows a circuit of a fluorescent lamp with an adjustable choke,
  • FIG. 5 shows a further circuit of a fluorescent lamp with an adjustable choke,
  • FIG. 6 shows a circuit of a fluorescent lamp to avoid flickering,
  • Figure 7 shows an alternative to Figure 6 and
  • 8 shows a further alternative to FIG. 6.

Eine Leuchtstofflampe(1) weist eine Leuchtstoffröhre(2) mit zwei Lampenelektroden(3,4) auf. Die Lampenelektroden(3,4) sind über ein passives oder aktives Vorschaltgerät(5) an eine Wechselspannungsquelle(6), insbesondere ein Flugzeug-Bordnetz, angeschlossen. Bei der Ausführung nach Figur 1 ist das Vorschaltgerät(5) eine Drossel. Bei den Ausführungsbeispielen nach den Figuren 3 und 4 ist das Vorschaltgerät(5) eine verstellbare Drossel.A fluorescent lamp (1) has a fluorescent tube (2) with two lamp electrodes (3, 4). The lamp electrodes (3, 4) are connected to an AC voltage source (6), in particular an aircraft electrical system, via a passive or active ballast (5). In the embodiment according to FIG. 1, the ballast (5) is a choke. In the exemplary embodiments according to FIGS. 3 and 4, the ballast (5) is an adjustable choke.

Bei den Ausführungsbeispielen nach den Figuren 1,2 und 6 bis 8 sind die der Wechselspannungsquelle(6) abgewandten Pole der Lampenelektroden(3,4) über einen Schalter(7) miteinander verbunden. Dieser ist von einer Steuerschaltung(8) steuerbar.In the exemplary embodiments according to FIGS. 1, 2 and 6 to 8, the poles of the lamp electrodes (3, 4) facing away from the AC voltage source (6) are connected to one another via a switch (7). This can be controlled by a control circuit (8).

Mittels der Steuerschaltung(8) ist eine Helligkeitssteuerung der Leuchtstofflampe(1) (Dimmbetrieb) in an sich bekannter Weise möglich. Die Steuerschaltung(8) weist hierfür einen Phasenschieber(9) auf. Sie öffnet beispielsweise in jeder Halbwelle der Netzwechselspannung den Schalter(7) gegenüber dem Nulldurchgang mehr oder weniger phasenverschoben. Durch das öffnen des Schalters(7) entsteht ein Zündimpuls, der die Leuchtstoffröhre(2) zündet.The control circuit (8) enables brightness control of the fluorescent lamp (1) (dimming operation) in a manner known per se. For this purpose, the control circuit (8) has a phase shifter (9). For example, it opens the switch (7) more or less out of phase with respect to the zero crossing in each half-wave of the AC line voltage. Opening the switch (7) creates an ignition pulse that ignites the fluorescent tube (2).

Figur 3 zeigt ein Zeitdiagramm des durch das Vorschaltgerät(5) fließenden Stromes. Die Schaltzeitpunkte, zu denen der Schalter(7) geschaltet wird, sind mit t1 bzw. t2 bezeichnet. Zu den Zeitpunkten t1 wird der Schalter(7) geöffnet. Die Schaltzeitpunkte t1 sind also die Zündzeitpunkte. Zu den Zeitpunkten t2 wird der Schalter(7) geschlossen. Die Schaltzeitpunkte t2 sind also die Löschzeitpunkte. Die Lampenhelligkeit hängt von der Strom-Zeitfläche zwischen den Schaltzeitpunkten t1 und t2 ab. Die Helligkeitssteuerung bzw. Helligkeitsregelung kann dementsprechend durch ein Verschieben der Zündzeitpunkte t1 und/oder ein Verschieben der Löschzeitpunkte t2 vorgenommen werden (vgl. Figur 3).FIG. 3 shows a time diagram of the current flowing through the ballast (5). The switching times at which the switch (7) is switched are designated t1 and t2. The switch (7) is opened at times t1. The switching times t1 are therefore the ignition times. At times t2 the switch (7) is closed. The switching times t2 are therefore the deletion times. The lamp brightness depends on the current-time area between the switching times t1 and t2. The brightness control or brightness regulation can accordingly be carried out by shifting the ignition times t1 and / or shifting the extinguishing times t2 (cf. FIG. 3).

An die Steuerschaltung(8) ist ein Meßglied(10) angeschlossen. Dieses erfaßt Abweichungen der Netzfrequenz und/oder der Netzspannung und verschiebt dementsprechend die Schaltzeitpunkte t1 oder t2 der Steuerschaltung(8). Dadurch werden störende Helligkeitsschwankungen ausgeglichen.A measuring element (10) is connected to the control circuit (8). This detects deviations in the network frequency and / or the network voltage and accordingly shifts the switching times t1 or t2 of the control circuit (8). This compensates for annoying fluctuations in brightness.

Das Meßglied(10) kann auch von einem Helligkeitssensor gebildet sein, der die Helligkeit der Leuchtstofflampe(1) erfaßt. Bei Schwankungen der Helligkeit verschiebt er die Schaltzeitpunkte der Steuerschaltung(8) so, daß eine gleichbleibende Helligkeit entsteht. Es liegt eine Helligkeitsregelung vor.The measuring element (10) can also be formed by a brightness sensor which detects the brightness of the fluorescent lamp (1). In the event of fluctuations in the brightness, it shifts the switching times of the control circuit (8) so that the brightness remains constant. There is a brightness control.

Bei den Ausführungsbeispielen nach den Figuren 2 und 5 sind für die Lampenelektroden(3,4) zusätzliche Heizschaltungen(11,12) vorgesehen, die unter Umgehung des Vorschaltgeräts(5) an die Wechselspannungsquelle(6) angeschlossen sind.In the exemplary embodiments according to FIGS. 2 and 5, additional heating circuits (11, 12) are provided for the lamp electrodes (3, 4) and are connected to the AC voltage source (6) bypassing the ballast (5).

Bei den Ausführungsbeispielen nach den Figuren 4 und 5 ist die verstellbare Drossel(5) an einen Regler(13) angeschlossen. Dieser ist mit dem Meßglied(10) und der Wechselspannungsquelle(6) verbunden. Der Regler(13) erfaßt Abweichungen der Netzfrequenz und/oder der Netzspannung und/oder der Helligkeit. Er stellt die Induktivität der Drossel(5) so nach, daß der Drosselstrom die Helligkeitsschwankungen ausgleicht.In the exemplary embodiments according to FIGS. 4 and 5, the adjustable throttle (5) is connected to a controller (13). This is connected to the measuring element (10) and the AC voltage source (6). The controller (13) detects deviations in the mains frequency and / or the mains voltage and / or the brightness. It adjusts the inductance of the choke (5) so that the choke current compensates for the brightness fluctuations.

Das Meßglied(10) ist beispielsweise ein Strommesser, der den durch das Vorschaltgerät(5) fließenden Strom mißt. Da die Lampenhelligkeit von der Strom-Zeitfläche zwischen den Schaltzeitpunkten t1 und t2 abhängt und die Steuerschaltung(8) diese erzeugt, kann eine Nachsteuerung der Helligkeit erfolgen. Abweichungen der Netzfrequenz und/oder der Netzspannung führen zu einer Änderung des durch das Vorschaltgerät(5) fließenden Stromes, was an sich zu einer Änderung der Helligkeit führen würde. Durch die Verschiebung der Schaltzeitpunkte t1 und/oder t2 läßt sich dieser Effekt ausregeln.The measuring element (10) is, for example, an ammeter which measures the current flowing through the ballast (5). Since the lamp brightness depends on the current time area between the switching times t1 and t2 and the control circuit (8) generates it, the brightness can be readjusted. Deviations in the mains frequency and / or the mains voltage lead to a change in the current flowing through the ballast (5), which in itself would lead to a change in the brightness. This effect can be corrected by shifting the switching times t1 and / or t2.

Bei den Ausführungsbeispielen nach den Figuren 6 bis 8 ist ein zusätzlicher Schalter(14) vorgesehen, mit dem sich flackernde, also verbrauchte Leuchtstofflampen abschalten lassen. Der Schalter(14) wird von der Steuerschaltung(8) geschaltet.In the exemplary embodiments according to FIGS. 6 to 8, an additional switch (14) is provided, with which flickering, that is to say used-up, fluorescent lamps can be switched off. The switch (14) is switched by the control circuit (8).

Beim Ausführungsbeispiel nach Figur 6 mißt das von einem Strommesser gebildete Meßglied(10) nach jedem öffnen des Schalters(7), also nach dem Zündimpuls, den Strom. Fließt ein Strom, dann ist dies ein Zeichen dafür, daß die Leuchtstofflampe(1) gezündet ist. Der Schalter(14) bleibt geschlossen. Fließt dagegen kein Strom, dann ist dies ein Zeichen dafür, daß der Zündimpuls nicht zum Zünden der Leuchtstofflampe(1) geführt hat. Erfolgt nach einem oder mehreren Zündimpulsen kein Zünden der Leuchtstofflampe(1), dann öffnet die Steuerschaltung(8) den Schalter(14), wodurch die Leuchtstofflampe(1) zwangsweise abgeschaltet wird.In the exemplary embodiment according to FIG. 6, the measuring element (10) formed by an ammeter measures the current each time the switch (7) is opened, that is to say after the ignition pulse. If a current flows, this is a sign that the fluorescent lamp (1) has been lit. The switch (14) remains closed. If, on the other hand, no current is flowing, this is a sign that the ignition pulse has not led to the ignition of the fluorescent lamp (1). If the fluorescent lamp (1) is not ignited after one or more ignition pulses, the control circuit (8) opens the switch (14), whereby the fluorescent lamp (1) is forcibly switched off.

Beim Ausführungsbeispiel nach Figur 7 ist als Meßglied(10) ein Spannungsmesser vorgesehen, der netzseitig die Spannung zwischen den Lampenelektroden(3,4) erfaßt. Wenn der Schalter(7) offen ist und die Leuchtstofflampe(1) trotzdem nicht leuchtet, weicht die vom Meßglied(10) gemessene Spannung von der Spannung ab, die entsteht, wenn die Leuchtstofflampe(1) leuchtet. Dies ist ein Zeichen dafür, daß die Leuchtstofflampe(1) trotz eines bzw. mehrerer Zündversuche nicht gezündet hat. Die Steuerschaltung(8) öffnet dann den Schalter(14).In the embodiment according to FIG. 7, a voltage meter is provided as the measuring element (10), which detects the voltage between the lamp electrodes (3, 4) on the mains side. If the switch (7) is open and the fluorescent lamp (1) still does not light up, the voltage measured by the measuring element (10) deviates from the voltage which arises when the fluorescent lamp (1) shines. This is a sign that the fluorescent lamp (1) has not ignited despite one or more ignition attempts. The control circuit (8) then opens the switch (14).

Beim Ausführungsbeispiel nach Figur 8 ist ein Helligkeitssensor(15) vorgesehen, der an die Steuerschaltung(8) angeschlossen ist. Leuchtet die Leuchtstofflampe(1) trotz eines oder mehrerer Zündversuche nicht, dann wird wiederum der Schalter(14) von der Steuerschaltung(8) geöffnet.In the exemplary embodiment according to FIG. 8, a brightness sensor (15) is provided, which is connected to the control circuit (8). If the fluorescent lamp (1) does not light up despite one or more ignition attempts, then the switch (14) is opened again by the control circuit (8).

Weitere Ausführungsbeispiele ergeben sich durch eine Kombination eines oder mehrerer Merkmale der beschriebenen Ausführungsbeispiele. So ist es beispielsweise möglich die Maßnahme nach Figur 6 bei den Schaltungen nach den Figuren 1 oder 2 einzusetzen. Es ist dann nur ein einziges Stommeßglied(10) nötig.Further exemplary embodiments result from a combination of one or more features of the exemplary embodiments described. For example, it is possible to use the measure according to FIG. 6 in the circuits according to FIGS. 1 or 2. Then only a single current measuring element (10) is required.

Claims (6)

Schaltungsanordnung für den Betrieb einer Leuchtstofflampe an einem Wechselstromnetz, beispielsweise einem Flugzeug-Bordnetz, mit einem zwischen zwei Lampenelektroden liegenden Schalter, der mittels einer Steuerschaltung schaltbar ist, die zur Helligkeitssteuerung den Schalter in phasenverschobenen Schaltzeitpunkten periodisch schaltet,
dadurch gekennzeichnet,
daß an die Steuerschaltung(8) ein Meßglied(10) angeschlossen ist, das in Abhängigkeit von Abweichungen der Netzfrequenz und/oder der Netzspannung und/oder der Helligkeit von Sollwerten die Schaltzeitpunkte der Steuerschaltung so verschiebt, daß im sichtbaren Bereich liegende Helligkeitsschwankungen ausgeglichen werden.Circuit arrangement for the operation of a fluorescent lamp on an alternating current network, for example an aircraft electrical system, with a switch located between two lamp electrodes which can be switched by means of a control circuit which periodically switches the switch at brightness-shifted switching times for brightness control,
characterized,
that a measuring element (10) is connected to the control circuit (8) which, depending on deviations in the mains frequency and / or the mains voltage and / or the brightness of setpoints, shifts the switching times of the control circuit in such a way that brightness fluctuations lying in the visible range are compensated for. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß das Meßglied ein Strommesser(10) ist.Circuit arrangement according to claim 1, characterized in that the measuring element is a current meter (10). Schaltungsanordnung für den Betrieb einer Leuchtstofflampe an einem Wechselstromnetz, beispielsweise einem Flugzeug-Bordnetz, mit einer der Leuchtstofflampe vorgeschalteten Drossel,
dadurch gekennzeichnet,
daß die Induktivität der Drossel(5) einstellbar ist und daß zur Einstellung der Induktivität ein Regler(13) vorgesehen ist, der mittels eines Meßgliedes(10) Abweichungen der Netzfrequenz und/oder der Netzspannung und/oder der Helligkeit von Sollwerten erfaßt und die Induktivität zum Ausgleich von sichtbaren Helligkeitsschwankungen nachstellt.Circuit arrangement for operating a fluorescent lamp on an AC network, for example an aircraft electrical system, with a choke connected upstream of the fluorescent lamp,
characterized,
that the inductance of the inductor (5) is adjustable and that a regulator (13) is provided for setting the inductance, which detects deviations in the mains frequency and / or the mains voltage and / or the brightness from setpoints by means of a measuring element (10) and the inductance to compensate for visible fluctuations in brightness. Schaltungsanordnung für den Betrieb einer Leuchtstofflampe an einem Wechselstromnetz, beispielsweise einem Flugzeug-Bordnetz,
dadurch gekennzeichnet,
daß ein Schalter(14) zum Abschalten der Leuchtstofflampe(1) und eine Steuerschaltung(8) vorgesehen sind, die die Zündversuche und das Leuchten der Leuchtstofflampe(1) überwacht und die nach einer gewissen Anzahl von Zündversuchen oder einer bestimmten Zeit nach dem ersten Zündversuch den Schalter(14) öffnet, wenn die Leuchtstofflampe(1) nach diesen Zündversuchen nicht gezündet hat.Circuit arrangement for the operation of a fluorescent lamp on an AC network, for example an aircraft electrical system,
characterized,
that a switch (14) for switching off the fluorescent lamp (1) and a control circuit (8) are provided, which monitors the ignition attempts and the lighting of the fluorescent lamp (1) and after a certain number of ignition attempts or a certain time after the first ignition attempt the switch (14) opens if the fluorescent lamp (1) has not ignited after these ignition attempts. Schaltungsanordnung nach Anspruch 4, dadurch gekennzeichnet, daß ein Meßglied(10) angeschlossen ist, das den nach Zündversuchen durch die Leuchtstofflampe(1) fließenden Strom oder die nach Zündversuchen an der Leuchtstofflampe abfallende Spannung erfaßt.Circuit arrangement according to Claim 4, characterized in that a measuring element (10) is connected which detects the current flowing through the fluorescent lamp (1) after ignition attempts or the voltage drop across the fluorescent lamp after ignition attempts. Schaltungsanordnung nach Anspruch 4, dadurch gekennzeichnet, daß ein Helligkeitsmesser(15) an die Steuerschaltung angeschlossen ist, der die Lampenhelligkeit erfaßt.Circuit arrangement according to claim 4, characterized in that a brightness meter (15) is connected to the control circuit which detects the lamp brightness.
EP91113562A 1990-08-16 1991-08-13 Circuit assembly for operating a fluorescent lamp Expired - Lifetime EP0471331B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4025939 1990-08-16
DE4025939A DE4025939C2 (en) 1990-08-16 1990-08-16 Circuit arrangement for starting and controlling the brightness of a fluorescent lamp during operation

Publications (2)

Publication Number Publication Date
EP0471331A1 true EP0471331A1 (en) 1992-02-19
EP0471331B1 EP0471331B1 (en) 1995-02-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91113562A Expired - Lifetime EP0471331B1 (en) 1990-08-16 1991-08-13 Circuit assembly for operating a fluorescent lamp

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DE (2) DE4025939C2 (en)

Cited By (5)

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WO1997011580A1 (en) * 1995-09-19 1997-03-27 Beacon Light Products, Inc. Preheating and starting circuit and method for a fluorescent lamp
WO1997011585A1 (en) * 1995-09-19 1997-03-27 Beacon Light Products, Inc. Resonant voltage-multiplication, current-regulating and ignition circuit for a fluorescent lamp
WO1997011586A1 (en) * 1995-09-19 1997-03-27 Beacon Light Products, Inc. Method of regulating lamp current through a fluorescent lamp by pulse energizing a driving supply
US5652481A (en) * 1994-06-10 1997-07-29 Beacon Light Products, Inc. Automatic state tranition controller for a fluorescent lamp
US5955847A (en) * 1994-06-10 1999-09-21 Beacon Light Products, Inc. Method for dimming a fluorescent lamp

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DE19625077B4 (en) * 1996-06-22 2005-05-19 Diehl Stiftung & Co. Kg Fluorescent lamp ballast
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US5652481A (en) * 1994-06-10 1997-07-29 Beacon Light Products, Inc. Automatic state tranition controller for a fluorescent lamp
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WO1997011586A1 (en) * 1995-09-19 1997-03-27 Beacon Light Products, Inc. Method of regulating lamp current through a fluorescent lamp by pulse energizing a driving supply

Also Published As

Publication number Publication date
DE59104466D1 (en) 1995-03-16
DE4025939C2 (en) 1994-03-24
DE4025939A1 (en) 1992-02-20
EP0471331B1 (en) 1995-02-01

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