EP0471331B1 - Circuit assembly for operating a fluorescent lamp - Google Patents
Circuit assembly for operating a fluorescent lamp Download PDFInfo
- Publication number
- EP0471331B1 EP0471331B1 EP91113562A EP91113562A EP0471331B1 EP 0471331 B1 EP0471331 B1 EP 0471331B1 EP 91113562 A EP91113562 A EP 91113562A EP 91113562 A EP91113562 A EP 91113562A EP 0471331 B1 EP0471331 B1 EP 0471331B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluorescent lamp
- switch
- ignition
- brightness
- lamp
- 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.)
- Expired - Lifetime
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Classifications
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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 starting and controlling the brightness of a fluorescent lamp in operation according to the preamble of claim 1.
- DE 30 25 249 A1 discloses a generic circuit arrangement.
- a shunt branch which has a controllable electrical valve in the form of a triac.
- One of the electrodes of the fluorescent lamp is grounded via a current measuring resistor.
- a zero crossing of the lamp current generates a certain voltage drop across this current measuring resistor, which causes a short zero crossing signal to be generated in a pulse generator.
- a control pulse generator is operatively connected to the pulse generator, which applies the ignition pulses to the electrodes of the fluorescent lamp. Since a lamp current at the current measuring resistor does not cause a voltage drop before the start-up, so that the circuit is not yet working, the signals which excite the pulse generator are applied by an ignition pulse generator.
- DE 36 13 876 A1 discloses an electronic starting device for preheating and igniting fluorescent lamps operated with ac voltage.
- an ignition circuit has an inductance and a controllable semiconductor switch which acts as an electronic switch with a purely time specification.
- the solution features ensure that fluctuations in the voltage and / or the frequency of the network cannot 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.
- a switch for switching off the fluorescent lamp and a control circuit are provided in the circuit arrangement, which monitors the ignition attempts and the lighting of the fluorescent lamp and which after a certain number of ignition attempts or after a specific time after the first attempt to ignite, the switch opens if the fluorescent lamp has not ignited after these attempts to ignite.
- 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. Alternatively, it can also be an adjustable throttle.
- 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 this purpose. 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) generates 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.
- the switch (7) is closed at the times t2.
- the switching times t2 are therefore the deletion times.
- the lamp brightness depends on the current-time area between the switching points 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 mains frequency and / or the mains voltage and accordingly shifts the switching times t1 or t2 of the control circuit (8). This compensates for annoying fluctuations in brightness.
- additional heating current circuits (11, 12) are provided for the lamp electrodes (3, 4) and are connected to the AC voltage source (6) bypassing the ballast (5).
- the measuring element (10) is 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.
Description
Die Erfindung betrifft eine Schaltungsanordnung für das Starten und die Helligkeitssteuerung einer Leuchtstofflampe im Betrieb nach dem Oberbegriff des Patentanspruches 1.The invention relates to a circuit arrangement for starting and controlling the brightness of a fluorescent lamp in operation according to the preamble of claim 1.
Durch die DE 30 25 249 A1 ist eine gattungsgemäße Schaltungsanordnung offenbart. Parallel zur Entladungsstrecke der Leuchtstofflampe liegt bei dieser Schaltungsanordnung ein Nebenschlußzweig, der ein steuerbares elektrisches Ventil in Gestalt eines Triac aufweist. Eine der Elektroden der Leuchtstofflampe ist über einen Strommeßwiderstand geerdet. Ein Nulldurchgang des Lampenstromes erzeugt an diesem Strommeßwiderstand einen bestimmten Spannungsabfall, der in einem Impulsgeber die Erzeugung eines kurzen Nulldurchgangmeldesignales bewirkt. Mit dem Impulsgeber steht ein Steuerimpulsgeber in Wirkverbindung, der die Zündimpulse an die Elektroden der Leuchtstofflampe legt. Da vor Inbetriebnahme ein Lampenstrom an dem Strommeßwiderstand noch keinen Spannungsabfall verursacht, so daß die Schaltung noch nicht arbeitet, erfolgt eine Beaufschlagung mit den Impulsgeber erregenden Signalen durch einen Zündimpulsgenerator.DE 30 25 249 A1 discloses a generic circuit arrangement. In this circuit arrangement, parallel to the discharge path of the fluorescent lamp, there is a shunt branch which has a controllable electrical valve in the form of a triac. One of the electrodes of the fluorescent lamp is grounded via a current measuring resistor. A zero crossing of the lamp current generates a certain voltage drop across this current measuring resistor, which causes a short zero crossing signal to be generated in a pulse generator. A control pulse generator is operatively connected to the pulse generator, which applies the ignition pulses to the electrodes of the fluorescent lamp. Since a lamp current at the current measuring resistor does not cause a voltage drop before the start-up, so that the circuit is not yet working, the signals which excite the pulse generator are applied by an ignition pulse generator.
Eine weitere 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.Another 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. By opening the switch in every mains half-wave there are 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 diesen 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 these 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.
Durch die DE OS-21 15 293 ist ein Bimetallschalter für Leuchtstofflampen bekannt, der parallel zu den Lampenelektroden angeordnet ist und als Starter wirkt.From DE OS-21 15 293 a bimetal switch for fluorescent lamps is known, which is arranged parallel to the lamp electrodes and acts as a starter.
Die DE 36 13 876 A1 offenbart eine elektronische Startvorrichtung zum Vorheizen und Zünden von mit Neztwechselspannung betriebenen Leuchtstofflampen. Ein Zündstromkreis weist neben den Elektroden der Leuchtstofflampe eine Induktivität und einen steuerbaren Halbleiterschalter auf, der als Elektronikschalter mit reiner Zeitvorgabe wirkt.DE 36 13 876 A1 discloses an electronic starting device for preheating and igniting fluorescent lamps operated with ac voltage. In addition to the electrodes of the fluorescent lamp, an ignition circuit has an inductance and a controllable semiconductor switch which acts as an electronic switch with a purely time specification.
Ausgehend von dem geschilderten Stand der Technik ist es Aufgabe der Erfindung, eine Schaltungsanordnung der eingangs genannten Art vorzuschlagen, die unerwünschte, sichtbare Helligkeitsschwankungen beim Startvorgang der Leuchtstofflampe vermeidet.Starting from the described prior art, it is an object of the invention to propose a circuit arrangement of the type mentioned at the outset which avoids undesirable, visible fluctuations in brightness when the fluorescent lamp is started up.
Erfindungsgemäß ist obige Aufgabe bei einer Schaltungsanordnung der eingangs genannten Art durch die Merkmale des Patentanspruches 1 gelöst. Weiterbildungen dieser Lösung ergeben sich aus dem Patentanspruch 2.According to the invention the above object is in a circuit arrangement of the type mentioned by the features of Claim 1 solved. Further developments of this solution result from
Durch die Lösungsmerkmale 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.The solution features ensure that fluctuations in the voltage and / or the frequency of the network cannot 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.
Um Helligkeitsschwankungen zu vermeiden, die auf dem Flackern verbrauchter Leuchtstofflampen beruhen, ist bei der Schaltungsanordnung 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 bestimmtenZeit nach dem ersten Zündversuch, den Schalter öffnet, wenn die Leuchtstofflampe nach diesen Zündversuchen nicht gezündet hat.In order to avoid brightness fluctuations, which are based on the flickering of used fluorescent lamps, a switch for switching off the fluorescent lamp and a control circuit are provided in the circuit arrangement, which monitors the ignition attempts and the lighting of the fluorescent lamp and which after a certain number of ignition attempts or after a specific time after the first attempt to ignite, the switch opens if the fluorescent lamp has not ignited after these attempts to ignite.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der folgenden Beschreibung von Ausführungsbeispielen. In den Zeichnungen 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 zur Vermeidung des Flackerns.
- Figure 1
- a circuit of a fluorescent lamp with brightness control,
- Figure 2
- another circuit of a fluorescent lamp with brightness control,
- Figure 3
- a current diagram,
- Figure 4
- a circuit of a fluorescent lamp to avoid flickering.
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. Es kann alternativ auch eine verstellbare Drossel sein.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. Alternatively, it can also be an adjustable throttle.
Bei den Ausführungsbeispielen nach den Figuren 1, 2 und 4 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 4, 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. The control circuit (8) has a phase shifter (9) for this purpose. 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) generates 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 Schaltpunkten 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. The switch (7) is closed at the times t2. The switching times t2 are therefore the deletion times. The lamp brightness depends on the current-time area between the switching points 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 mains frequency and / or the mains voltage and accordingly shifts the switching times t1 or t2 of the control circuit (8). This compensates for annoying fluctuations in brightness.
Bei dem Ausführungsbeispiel nach Figur 2 sind für die Lampenelektroden (3,4) zusätzlich Heizstromschaltungen (11,12) vorgesehen, die unter Umgehung des Vorschaltgerätes (5) an die Wechselspannungsquelle (6) angeschlossen sind.In the exemplary embodiment according to FIG. 2, additional heating current circuits (11, 12) are provided for the lamp electrodes (3, 4) and are connected to the AC voltage source (6) bypassing the ballast (5).
Das Meßglied (10) ist 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 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 dem Ausführungsbeispiel nach Figur 4 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 embodiment according to FIG. 4, 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).
Das von einem Strommesser gebildete Meßglied (10) mißt 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.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.
Weitere Ausführungsbeispiele ergeben sich durch eine Kombination eines oder mehrerer Merkmale der beschriebenen Ausführungsbeispiele. So ist es beispielsweise möglich, die Maßnahme nach Figur 4 bei den Schaltungen nach den Figuren 1 oder 2 einzusetzen. Es ist dann nur ein einziges Strommeßglied (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. 4 in the circuits according to FIGS. 1 or 2. Then only a single current measuring element (10) is required.
Claims (2)
- Circuit arrangement for starting and adjusting the brightness of a fluorescent lamp (1) operating on an alternating current mains, for example an aeroplane's supply system, with a choke (5) connected on the supply side of the fluorescent lamp (1), a measuring element (10) provided in the input current circuit and a switch (7), which lies between two lamp electrodes and is periodically switchable in out-of-phase instants of switching by means of a control circuit (8),
characterized in that
during the starting process, the control circuit (8) monitors the ignition attempts and the lighting of the fluorescent lamp (1) and opens a switch (14) located in a mains supply line if, after a certain number of ignition attempts or a certain time following the first ignition attempt, the fluorescent lamp (1) has not ignited, and in that the measuring element (10) is an ammeter, which measures the current value and in operation, for the adjustment of visible brightness fluctuations, defers the instants of switching of the control circuit (8). - Circuit arrangement according to Claim 1,
characterized in that the measuring element (10) measures the current flowing through the fluorescent lamp (1) after ignition attempts or the voltage falling off at the fluorescent lamp (1) after ignition attempts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4025939A DE4025939C2 (en) | 1990-08-16 | 1990-08-16 | Circuit arrangement for starting and controlling the brightness of a fluorescent lamp during operation |
| DE4025939 | 1990-08-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0471331A1 EP0471331A1 (en) | 1992-02-19 |
| EP0471331B1 true EP0471331B1 (en) | 1995-02-01 |
Family
ID=6412347
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 |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0471331B1 (en) |
| DE (2) | DE4025939C2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4328306A1 (en) * | 1993-08-23 | 1994-03-17 | Spindler Bernhard Dipl Ing | Circuit for HF operation for low presence discharge lamps - has rectifier and inverter and several opto-couplers, with controlled load circuit |
| DE9402631U1 (en) * | 1994-02-17 | 1995-06-22 | Trilux Lenze Gmbh & Co Kg | Fluorescent ballast |
| 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 |
| DE4428423A1 (en) * | 1994-08-11 | 1996-02-15 | Diehl Gmbh & Co | Measurement method for measuring flicker intensity of discharge lamp |
| AU7070496A (en) * | 1995-09-19 | 1997-04-09 | Beacon Light Products, Inc. | Method of regulating lamp current through a fluorescent lamp by pulse energizing a driving supply |
| US5708330A (en) * | 1995-09-19 | 1998-01-13 | Beacon Light Products, Inc. | Resonant voltage-multiplication, current-regulating and ignition circuit for a fluorescent lamp |
| US5736817A (en) * | 1995-09-19 | 1998-04-07 | Beacon Light Products, Inc. | Preheating and starting circuit and method for a fluorescent lamp |
| DE19625077B4 (en) * | 1996-06-22 | 2005-05-19 | Diehl Stiftung & Co. Kg | Fluorescent lamp ballast |
| DE19943256A1 (en) * | 1999-09-10 | 2001-03-15 | Hella Kg Hueck & Co | Aircraft light unit control device has switched bypass unit in parallel with light unit for providing overvoltage protection |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3025249A1 (en) * | 1980-07-03 | 1982-01-28 | Helmut Ulrich Apparatebau, 8000 München | Brightness control circuit for fluorescent lamps - has controllable shunt, parallel to lamp discharge path, and in series with heating electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1932931A1 (en) * | 1968-04-06 | 1971-01-07 | Stotz Kontakt Gmbh | Arrangement for controlling the brightness of a fluorescent lamp |
| US3599037A (en) * | 1969-05-01 | 1971-08-10 | Xerox Corp | Gaslamp lead ballast circuit having feedback control |
| DE2115293A1 (en) * | 1971-03-30 | 1972-10-12 | Schulz J | Bimetal switch for fluorescent lamps |
| CH595036A5 (en) * | 1975-05-30 | 1978-01-31 | Novelectric Ag | Fluorescent lamp control circuit |
| FI78212C (en) * | 1982-12-10 | 1989-06-12 | Siemens Ag | Apparatus for controlling light intensity of low-pressure discharge lamps |
| DE3327189A1 (en) * | 1983-07-28 | 1985-02-07 | Diehl GmbH & Co, 8500 Nürnberg | Circuit arrangement for the starting and brightness control of fluorescent lamps |
| DE3343930A1 (en) * | 1983-12-05 | 1985-06-13 | Horst 2741 Kutenholz Erzmoneit | CIRCUIT ARRANGEMENT FOR OPERATING FLUORESCENT OR ULTRAVIOLET LOW-VOLTAGE DISCHARGE LAMPS |
| GB8520105D0 (en) * | 1985-08-09 | 1985-09-18 | Parker Graphics Ltd | Electric control circuit |
| DE3613876A1 (en) * | 1986-04-24 | 1987-10-29 | Thomas Bilger | Electronic starting and protection device for preheating and starting fluorescent lamps which are operated using the mains AC voltage |
| DE3710275A1 (en) * | 1987-03-28 | 1988-10-06 | Ceag Licht & Strom | ARRANGEMENT FOR STARTING AND OPERATING A FLUORESCENT LAMP |
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1990
- 1990-08-16 DE DE4025939A patent/DE4025939C2/en not_active Expired - Fee Related
-
1991
- 1991-08-13 EP EP91113562A patent/EP0471331B1/en not_active Expired - Lifetime
- 1991-08-13 DE DE59104466T patent/DE59104466D1/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3025249A1 (en) * | 1980-07-03 | 1982-01-28 | Helmut Ulrich Apparatebau, 8000 München | Brightness control circuit for fluorescent lamps - has controllable shunt, parallel to lamp discharge path, and in series with heating electrode |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4025939A1 (en) | 1992-02-20 |
| DE59104466D1 (en) | 1995-03-16 |
| DE4025939C2 (en) | 1994-03-24 |
| EP0471331A1 (en) | 1992-02-19 |
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