EP1945008B1 - Light sensor for a pre-switching device for operating a gas discharge light - Google Patents

Light sensor for a pre-switching device for operating a gas discharge light Download PDF

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Publication number
EP1945008B1
EP1945008B1 EP08155561.7A EP08155561A EP1945008B1 EP 1945008 B1 EP1945008 B1 EP 1945008B1 EP 08155561 A EP08155561 A EP 08155561A EP 1945008 B1 EP1945008 B1 EP 1945008B1
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EP
European Patent Office
Prior art keywords
lamp
gas discharge
discharge lamp
circuit
potential
Prior art date
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Expired - Lifetime
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EP08155561.7A
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German (de)
French (fr)
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EP1945008A1 (en
Inventor
Falk Richter
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Tridonic GmbH and Co KG
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Tridonic GmbH and Co KG
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Publication of EP1945008A1 publication Critical patent/EP1945008A1/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
    • H05B41/26—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
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
    • 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
    • H05B41/282—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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the invention relates to a ballast for at least one gas discharge lamp.
  • the lamp electrodes are preheated before the ignition voltage is applied between them. It has been shown that the life of the lamps can be extended to a considerable extent by this measure.
  • the gas discharge lamp is usually operated on a series resonant circuit, wherein the resonant circuit capacitor is generally parallel to the discharge path of the gas discharge lamp.
  • the electrodes of the lamp are designed as heating coils, through which the current of the resonant circuit flows when the lamp is not lit.
  • the frequency is changed relative to the resonance frequency of the series resonant circuit such that the voltage across the resonant capacitor and thus across the gas discharge lamp does not cause ignition of the gas discharge lamp.
  • a substantially constant current flows through the lamp electrodes designed as helices, so that they are preheated.
  • the frequency is set in the vicinity of the resonant frequency of the resonant circuit, whereby the voltage across the resonant capacitor is increased so that the gas discharge lamp finally ignites.
  • the ballast should additionally have a function monitoring the status of the lamp in order to detect any malfunctions and to be able to initiate corresponding measures. These measures may include, for example, the shutdown of the high voltage part.
  • a malfunction may occur, for example, if one of the two coils or both are defective, or if the lamp has been completely removed or not (correctly) inserted into the sockets of the lamp.
  • a ballast for the operation of gas discharge lamps which contains a controlled inverter, which operates at a frequency above the mains frequency.
  • a monitoring circuit which is connected in parallel with the gas discharge lamp, both the supply voltage for the inverter and the voltage occurring at the lamp filaments are monitored.
  • the inverter is thereby to be protected against overload due to a too high supply voltage or in the absence or failure of the fluorescent lamp.
  • the publication EP 0 707 437 A2 describes a circuit arrangement for operating one or more low-pressure discharge lamps.
  • the circuit arrangement includes an inverter and a drive device for the inverter and a DC path which connects the drive device of the inverter with an electrical voltage source and in which the electrodes of the low-pressure charged lamps to be operated are integrated.
  • the DC path ensures that the drive device starts the inverter for the first time.
  • the lamp electrodes are integrated in the DC path, so that in the case of a defective lamp electrode, the DC path is interrupted. This prevents a renewed oscillation of the inverter when the supply voltage is switched on.
  • the publication US 5,883,473 describes an operating device having an AC-to-DC converter, an inverter, a high voltage detection circuit 500, and a no-load detection circuit 600.
  • the operating device stops switching the inverter in response to lamp failures.
  • Fig. 3 schematically shows a section of a ballast, which is designed on the one hand for detecting a lamp failure (coil breakage, non-insertion or removal of the lamp, etc.) and on the other hand for detecting the lamp voltage.
  • a lamp failure coil breakage, non-insertion or removal of the lamp, etc.
  • a lamp voltage It is denoted by the reference numeral 1 in the FIGS. 1 to 3 schematically an inverter with its two alternately clocked switches (power transistors) 17 and 18 referred to.
  • a load circuit 3 is connected, which has a series resonant circuit 22, consisting of a resonance inductor 16 (L R ) and a resonant capacitor 5 (C R ) .
  • a coupling capacitor 2 C K
  • the discharge path of the lamp 4 is connected in parallel with the resonance capacitor 5.
  • the heating coils 8 and 9 of the gas discharge lamp 4 can be seen.
  • a measuring resistor 26 (R) is connected, through which the lamp current and the Helical current flows.
  • a measuring signal 10a (S1) can be tapped which shows whether a heating current can flow through the coils 8 and 9 in the unfired condition of the lamp and if thus a lamp 4 with proper heating coils 8 and 9 is inserted in the provided sockets.
  • a voltage divider 7 is additionally connected in parallel to the gas discharge lamp 4 on the side of the coupling capacitor 2 ( C K ) of the load circuit 3.
  • This voltage divider 7 has two resistors 14 and 15 ( R 1 and R 2 ) , which are connected in series.
  • a signal 10b (S2) can be tapped, which is representative of the voltage applied across the discharge path of the gas discharge lamp 4 voltage.
  • the sensor circuit has a voltage divider which, on the one hand, is connected to the "upper" potential-carrying filament of the lamp and, on the other hand, to ground.
  • the sensor circuit 6 allows the tapping of a sensor signal (S2) for detecting a lamp failure or for detecting the lamp voltage.
  • S2 sensor signal
  • a high-resistance resistor R K may be connected in parallel to easily form a DC branch.
  • the sensor circuit may be integrated in an ASIC.
  • the heating power can be capacitively or inductively coupled into at least one filament of the gas discharge lamp.
  • a method for detecting the lamp voltage and for detecting a lamp failure in a ballast for gas discharge lamps according to claim 7 is provided according to the invention.
  • the filament current is monitored and during normal operation the lamp current is monitored.
  • Fig. 1 schematically an embodiment of the present invention is shown.
  • the ballast according to the invention has an inverter 1 with two series-connected, connected to a DC voltage source U bus and alternately clocked transistor switches 17 and 18 ( T 1 and T 2 ) on.
  • the switching can be effected by a control unit 23, which can be realized as an integrated circuit (IC) and in particular in an ASIC.
  • a load circuit 3 is connected, which has a series resonant circuit 22 and the lamp 4.
  • the series resonant circuit 22 consists of a resonance inductor 16 ( L R ) and a resonant capacitor 5 ( C R ).
  • the discharge path of the gas discharge lamp 4 between the two heating coils 8 and 9 is, as known, connected in parallel with the resonance capacitor 5 (C R ) .
  • a high-resistance resistor 12 ( R K ) is connected, so that bypassing the coupling capacitor 2 ( C K ) a low DC current I Dc through the upper heating coil 8 and a voltage divider explained later in detail. 7 can flow.
  • a measurement signal 10b is generated (Sensor signal S2) tapped, which after an analog-to-digital conversion of a (digital) evaluation circuit 13 can be supplied.
  • This evaluation circuit 13 can also be implemented as an integrated circuit.
  • the voltage divider 7 together with the signal tap 11 thus represents a sensor circuit 6 for detecting a lamp failure as well as for detecting the lamp voltage.
  • the evaluation circuit 13 can detect the following luminous states depending on the value of the sensor signal 10b (S2):
  • the high-resistance resistor 12 (R K ) in the parallel branch of the coupling capacitor 2 (C K ) further has the advantage that it so-called "Walmen", ie alternately bright and dark sections in the gas discharge lamp 4, by providing a can at least greatly reduce certain DC component.
  • Fig. 2 shows a further embodiment of the present invention.
  • the coupling of the heating power takes place in the heating coils 8 and 9 inductively via the two coils 19 and 20 ( L h 1 and L h 2 ) of a transformer. While a capacitive coupling of the heating power is usually preferred for non-dimmed devices, the dimmed devices, the inductive form of Schumacherseinkopplung is preferred.
  • the primary winding 21 ( L h 3 ) of a separate transformer can be used as a primary winding for the inductive heating power transmission.
  • the resonance inductance 16 ( L R ) is also shown schematically that the primary winding 21 ( L h 3 ) of a separate transformer can be used as a primary winding for the inductive heating power transmission.
  • the resonance inductance 16 ( L R ) is also shown schematically as a primary winding for the inductive coupling of the heating power into the heating coils 8 and 9 of the gas discharge lamp 4.
  • any type of coupling of the heating power in the heating coils 8 and 9 can be applied.
  • Inductance L h2 (implemented as a primary winding of a heating transformer Tr 2 ) for inductive coupling of the heating power in the second (lower) heating coil 9 of the gas discharge lamp.
  • Inductance L h3 (realized as a primary winding of a heating transformer Tr 3 ) for inductive coupling of the heating power in the heating coils of the gas discharge lamp.
  • 4 22 Series resonant circuit as part of the load circuit 3
  • Control unit (implemented as IC or ASIC) for driving the two realized as a self-locking n-channel MOSFETs T 1 and T 2 transistor switch 17 and 18th 24 Coupling capacitor C h 1 in Einkoppelzweig the first (upper) heating coil 8 of the gas discharge lamp.
  • 4 25 Coupling capacitor C h2 in Einkoppelzweig the second (lower) heating coil 9 of the gas discharge lamp.
  • 4 26 Measuring resistor R , connected in series with the second (lower) heating coil of the gas discharge lamp.

Abstract

The choke device has an inverter (1) with a pair of transistor switches (17,18) connected in series with a DC source (Ubus) in a push-pull circuit, the inverter linked to a load circuit (3) containing a gas discharge lamp (4) and a series resonance circuit (22) via a coupling capacitor (2) in parallel with a high-impedance resistor (12). A sensor circuit (6), for detecting lamp malfunction and the voltage applied to the lamp, has a voltage divider (7) in parallel with the lamp filaments (8,9) and the resonance capacitor (5), its center-tap (11) coupled to an evaluation circuit (13). An independent claim for a method for detection of lamp malfunction and the lamp voltage in a choke device for a gas discharge lamp is also included.

Description

Die Erfindung betrifft ein Vorschaltgerät für mindestens eine Gasentladungslampe.The invention relates to a ballast for at least one gas discharge lamp.

Üblicherweise werden heutzutage bei hochwertigen Vorschaltgeräten für Gasentladungslampen die Lampenelektroden vorgeheizt, bevor die Zündspannung zwischen diesen angelegt wird. Es hat sich gezeigt, dass durch diese Maßnahme die Lebensdauer der Lampen in erheblichem Maße verlängert werden kann.Typically, nowadays in high quality ballasts for gas discharge lamps, the lamp electrodes are preheated before the ignition voltage is applied between them. It has been shown that the life of the lamps can be extended to a considerable extent by this measure.

Wie beispielsweise in EP 0 594 880 A1 beschrieben, wird die Gasentladungslampe in der Regel an einem Serienschwingkreis betrieben, wobei der Schwingkreiskondensator in der Regel parallel zur Entladungsstrecke der Gasentladungslampe liegt. Die Elektroden der Lampe sind als Heizwendeln ausgebildet, durch die der Strom des Schwingkreises bei nicht gezündeter Lampe fließt. Im Vorheizbetrieb wird die Frequenz gegenüber der Resonanzfrequenz des Serienresonanzkreises derart verändert, dass die über dem Resonanzkondensator und damit über der Gasentladungslampe liegende Spannung keine Zündung der Gasentladungslampe verursacht. Auf diese Weise fließt ein im Wesentlichen konstanter Strom durch die als Wendeln ausgeführten Lampenelektroden, so dass diese vorgeheizt werden. Nach Ablauf der Vorheizphase wird die Frequenz in der Nähe der Resonanzfrequenz des Resonanzkreises eingestellt, wodurch sich die Spannung über den Resonanzkondensator so erhöht, dass die Gasentladungslampe schließlich zündet.Such as in EP 0 594 880 A1 described, the gas discharge lamp is usually operated on a series resonant circuit, wherein the resonant circuit capacitor is generally parallel to the discharge path of the gas discharge lamp. The electrodes of the lamp are designed as heating coils, through which the current of the resonant circuit flows when the lamp is not lit. In the preheating operation, the frequency is changed relative to the resonance frequency of the series resonant circuit such that the voltage across the resonant capacitor and thus across the gas discharge lamp does not cause ignition of the gas discharge lamp. In this way, a substantially constant current flows through the lamp electrodes designed as helices, so that they are preheated. After the preheat phase, the frequency is set in the vicinity of the resonant frequency of the resonant circuit, whereby the voltage across the resonant capacitor is increased so that the gas discharge lamp finally ignites.

Das Vorschaltgerät sollte neben der Hauptfunktion der Initiierung, Aufrechterhaltung und Abschaltung der Gasentladung zusätzlich eine den Zustand der Lampe überwachende Funktion aufweisen, um eventuelle Betriebsstörungen erfassen und dementsprechende Maßnahmen einleiten zu können. Diese Maßnahmen können beispielsweise die Abschaltung des Hochspannungsteils beinhalten.In addition to the main function of initiating, maintaining and switching off the gas discharge, the ballast should additionally have a function monitoring the status of the lamp in order to detect any malfunctions and to be able to initiate corresponding measures. These measures may include, for example, the shutdown of the high voltage part.

Eine Betriebsstörung kann beispielsweise dann vorliegen, wenn eine der beiden Wendeln oder auch beide defekt sind, oder wenn die Lampe vollständig entfernt bzw. nicht (korrekt) in die Fassungen der Leuchte eingesetzt wurde.A malfunction may occur, for example, if one of the two coils or both are defective, or if the lamp has been completely removed or not (correctly) inserted into the sockets of the lamp.

Aus EP 0 707 439 A1 ist ein Verfahren bekannt, bei dem bei einem elektronischen Vorschaltgerät für eine Gasentladungslampe der Spannungsabfall über einen in Serie mit der Primärwicklung eines Heiztransformators geschalteten Widerstand und somit der Heizstrom gemessen wird, um zu erfassen, ob ein Wendelbruch vorliegt, oder aber keine Lampe in die Fassung in die Leuchte eingesetzt wurde.Out EP 0 707 439 A1 a method is known in which, in an electronic ballast for a gas discharge lamp, the voltage drop across a connected in series with the primary winding of a heating transformer resistor and thus the heating current is measured to detect whether a coil breakage is present, or no lamp in the socket was used in the lamp.

In der Druckschrift DE 41 20 649 A1 wird ein Vorschaltgerät zum Betrieb von Gasentladungslampen beschrieben, das einen eingesteuerten Wechselrichter enthält, der auf einer über der Netzfrequenz liegenden Frequenz arbeitet. Mit Hilfe einer Überwachungsschaltung, die parallel zur Gasentladungslampe geschaltet ist, wird sowohl die Versorgungsspannung für den Wechselrichter als auch die an den Lampenwendeln auftretende Spannung überwacht. Der Wechselrichter soll dadurch gegen Überlast infolge einer zu hohen Versorgungsspannung oder bei Fehlen oder Versagen der Leuchtstofflampe geschützt werden.In the publication DE 41 20 649 A1 a ballast for the operation of gas discharge lamps is described, which contains a controlled inverter, which operates at a frequency above the mains frequency. By means of a monitoring circuit, which is connected in parallel with the gas discharge lamp, both the supply voltage for the inverter and the voltage occurring at the lamp filaments are monitored. The inverter is thereby to be protected against overload due to a too high supply voltage or in the absence or failure of the fluorescent lamp.

Die Druckschrift EP 0 707 437 A2 beschreibt eine Schaltungsanordnung zum Betrieb einer oder mehrere Niederdruckentladungslampen. Die Schaltungsanordnung enthält einen Inverter und einen Ansteuerungsvorrichtung für den Inverter sowie einen Gleichstrompfad der die Ansteuerungsvorrichtung des Inverters mit einer elektrischen Spannungsquelle verbindet und in den die Elektroden der zu betreibenden Niederdruckladungslampen integriert sind. Unmittelbar nach dem Einschalten der Versorgungsspannung gewährleistet der Gleichstrompfad, dass die Ansteuerungsvorrichtung den Inverter erstmalig startet. Die Lampenelektroden sind derart in den Gleichstrompfad integriert, dass im Fall einer defekten Lampenelektrode der Gleichstrompfad unterbrochen wird. Dadurch wird ein erneutes Anschwingen des Inverters bei Einschalten der Versorgungsspannung verhindert.The publication EP 0 707 437 A2 describes a circuit arrangement for operating one or more low-pressure discharge lamps. The circuit arrangement includes an inverter and a drive device for the inverter and a DC path which connects the drive device of the inverter with an electrical voltage source and in which the electrodes of the low-pressure charged lamps to be operated are integrated. Immediately after switching on the supply voltage, the DC path ensures that the drive device starts the inverter for the first time. The lamp electrodes are integrated in the DC path, so that in the case of a defective lamp electrode, the DC path is interrupted. This prevents a renewed oscillation of the inverter when the supply voltage is switched on.

Die Druckschrift US 5,883,473 beschreibt ein Betriebsgerät mit einem AC-nach-DC-Wandler, einem Inverter, einer Hochspannungserkennungsschaltung 500 und einer "no-load detection circuit" 600. Das Betriebsgerät beendet ein Schalten des Inverters in Antwort auf Lampenstörungen.The publication US 5,883,473 describes an operating device having an AC-to-DC converter, an inverter, a high voltage detection circuit 500, and a no-load detection circuit 600. The operating device stops switching the inverter in response to lamp failures.

Eine weitere Anforderung an moderne Vorschaltgeräte ist die Erfassung der über der Entladungsstrecke der Gasentladungslampe anliegenden Spannung.Another requirement for modern ballasts is the detection of the voltage applied across the discharge path of the gas discharge lamp.

Fig. 3 zeigt schematisch einen Ausschnitt eines Vorschaltgerätes, das einerseits zur Erfassung einer Lampenstörung (Wendelbruch, Nicht-Einsetzen bzw. Entnahme der Lampe etc.) und andererseits zur Erfassung der Lampenspannung ausgelegt ist. Dabei ist mit dem Bezugszeichen 1 in den Figuren 1 bis 3 schematisch ein Wechselrichter mit seinen beiden abwechselnd getakteten Schaltern (Leistungstransistoren) 17 und 18 bezeichnet. An dem Knotenpunkt des Wechselrichters 1 ist ein Lastkreis 3 angeschlossen, der einen Serienresonanzkreis 22, bestehend aus einer Resonanzinduktivität 16 (LR) und einem Resonanzkondensator 5 (CR), aufweist. Weiterhin ist ein Koppelkondensator 2 (CK ) vorgesehen, der den Lastkreis 3 kapazitiv an den Knotenpunkt des Wechselrichters 1 anschließt. Die Entladungsstrecke der Lampe 4 ist parallel zu dem Resonanzkondensator 5 geschaltet. Fig. 3 schematically shows a section of a ballast, which is designed on the one hand for detecting a lamp failure (coil breakage, non-insertion or removal of the lamp, etc.) and on the other hand for detecting the lamp voltage. It is denoted by the reference numeral 1 in the FIGS. 1 to 3 schematically an inverter with its two alternately clocked switches (power transistors) 17 and 18 referred to. At the node of the inverter 1, a load circuit 3 is connected, which has a series resonant circuit 22, consisting of a resonance inductor 16 (L R ) and a resonant capacitor 5 (C R ) . Furthermore, a coupling capacitor 2 ( C K ) is provided, which connects the load circuit 3 capacitively connected to the node of the inverter 1. The discharge path of the lamp 4 is connected in parallel with the resonance capacitor 5.

Weiterhin sind die Heizwendeln 8 und 9 der Gasentladungslampe 4 ersichtlich. In Serie zu der unteren Heizwendel 9, d.h. zwischen der Lampe 4 und dem Masseknoten ist ein Messwiderstand 26 (R) geschaltet, durch den der Lampenstrom und der Wendelstrom fließt. Mittels der somit an dem Messwiderstand 26 (R) abfallenden Spannung kann ein Messsignal 10a (S1) abgegriffen werden, das wiedergibt, ob im ungezündeten Zustand der Lampe ein Heizstrom durch die Wendeln 8 und 9 fließen kann und ob somit eine Lampe 4 mit ordnungsgemäßen Heizwendeln 8 und 9 in die dafür vorgesehenen Fassungen eingesetzt ist.Furthermore, the heating coils 8 and 9 of the gas discharge lamp 4 can be seen. In series with the lower heating coil 9, ie between the lamp 4 and the ground node, a measuring resistor 26 (R) is connected, through which the lamp current and the Helical current flows. By means of the voltage thus dropping across the measuring resistor 26 (R), a measuring signal 10a (S1) can be tapped which shows whether a heating current can flow through the coils 8 and 9 in the unfired condition of the lamp and if thus a lamp 4 with proper heating coils 8 and 9 is inserted in the provided sockets.

Zur Erfassung der Lampenspannung ist zusätzlich auf der Seite des Koppelkondensators 2 (CK ) des Lastkreises 3 ein Spannungsteiler 7 parallel zur Gasentladungslampe 4 geschaltet. Dieser Spannungsteiler 7 weist zwei Widerstände 14 und 15 (R 1 bzw. R2) auf, die in Serie geschaltet sind. Somit kann an dem Schaltungsknoten 11 zwischen den beiden Widerständen 14 und 15 ein Signal 10b (S2) abgegriffen werden, das für die über der Entladungsstrecke der Gasentladungslampe 4 anliegende Spannung repräsentativ ist.For detecting the lamp voltage, a voltage divider 7 is additionally connected in parallel to the gas discharge lamp 4 on the side of the coupling capacitor 2 ( C K ) of the load circuit 3. This voltage divider 7 has two resistors 14 and 15 ( R 1 and R 2 ) , which are connected in series. Thus, at the circuit node 11 between the two resistors 14 and 15 a signal 10b (S2) can be tapped, which is representative of the voltage applied across the discharge path of the gas discharge lamp 4 voltage.

Festzuhalten ist somit, dass bei einer derartigen Schaltung für die Erfassung der Lampenspannung sowie für die Erkennung einer Betriebsstörung der Lampe 4 je eine separat vorgesehene Schaltung vorgesehen werden muss. Dementsprechend müssen auch zwei Signale S1 und S2 verwertet werden.It should be noted that in such a circuit for the detection of the lamp voltage as well as for the detection of a malfunction of the lamp 4 per a separately provided circuit must be provided. Accordingly, two signals S1 and S2 must be utilized.

Angesichts der oben genannten Anforderungen an moderne elektronische Vorschaltgeräte ist es Aufgabe der vorliegenden Erfindung, eine Technologie bereitzustellen, die die Erfassung der an einer Gasentladungslampe in Betrieb anliegenden Spannung sowie das Erkennen einer Lampenstörung (fehlende Lampe etc.) in einfacher Weise ermöglicht.In view of the above requirements for modern electronic ballasts, it is an object of the present invention to provide a technology that allows the detection of voltage applied to a gas discharge lamp in operation voltage and the detection of a lamp failure (missing lamp, etc.) in a simple manner.

Insbesondere sollte für die Erfassung der Lampenspannung sowie die Erkennung einer Betriebsstörung der Lampe ein einziges Signal genügen.In particular, a single signal should suffice for the detection of the lamp voltage as well as the detection of a malfunction of the lamp.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des unabhängigen Anspruchs gelöst. Die abhängigen Ansprüche bilden den zentralen Gedanken der Erfindung in besonders vorteilhafter Weise weiter.This object is achieved by the features of the independent claim. Make the dependent claims continue the central idea of the invention in a particularly advantageous manner.

Erfindungsgemäß ist also ein Vorschaltgerät zum Betreiben einer Gasentladungslampe nach Anspruch 1 vorgesehen. Die Sensorschaltung weist dabei einen Spannungsteiler auf, der einerseits mit der "oberen" potentialführende Wendel der Lampe und andereseits mit Masse verbunden.According to the invention, therefore, a ballast for operating a gas discharge lamp according to claim 1 is provided. In this case, the sensor circuit has a voltage divider which, on the one hand, is connected to the "upper" potential-carrying filament of the lamp and, on the other hand, to ground.

Die Sensorschaltung 6 ermöglicht den Abgriff eines Sensorsignals (S2) zum Erkennen einer Lampenstörung bzw. zur Erfassung der Lampenspannung. Somit ist es Vorteil der vorliegenden Erfindung, das auf Grundlage eines einzigen Sensorsignals (S2) sowohl eine Lampenstörung wie auch die Lampenspannung ausgewertet werden können.The sensor circuit 6 allows the tapping of a sensor signal (S2) for detecting a lamp failure or for detecting the lamp voltage. Thus, it is an advantage of the present invention that on the basis of a single sensor signal (S2) both a lamp failure and the lamp voltage can be evaluated.

Zu dem Koppelkondensator kann ein hochohmiger Widerstand RK parallel geschaltet sein, um auf einfache Weise eine Gleichstromzweig zu bilden.To the coupling capacitor, a high-resistance resistor R K may be connected in parallel to easily form a DC branch.

Die Sensorschaltung kann in einem ASIC integriert sein.The sensor circuit may be integrated in an ASIC.

Die Heizleistung kann kapazitiv oder induktiv in wenigstens eine Wendel der Gasentladungslampe eingekoppelt sein.The heating power can be capacitively or inductively coupled into at least one filament of the gas discharge lamp.

Weiterhin ist gemäß der Erfindung ein Verfahren zur Erfassung der Lampenspannung und zur Erkennung einer Lampenstörung in einem Vorschaltgerät für Gasentladungslampen nach Anspruch 7 vorgesehen. Insbesondere während der Vorheiz- und Zündphase wird der Wendelstrom und während des Normalbetriebs der Lampenstrom überwacht.Furthermore, a method for detecting the lamp voltage and for detecting a lamp failure in a ballast for gas discharge lamps according to claim 7 is provided according to the invention. In particular during the preheating and ignition phase, the filament current is monitored and during normal operation the lamp current is monitored.

Weitere Merkmale, Vorteile und Eigenschaften werden nunmehr, bezugnehmend auf die Figuren der begleitenden Zeichnungen und anhand einer detaillierten Beschreibung von Ausführungsbeispielen, erläutert.

Fig. 1
zeigt dabei ein erstes Ausführungsbeispiel der Erfindung in schematischer Weise,
Fig. 2
zeigt ein weiteres Ausführungsbeispiel der Erfindung, und
Fig. 3
zeigt eine weitere prinzipielle Möglichkeit zur Erkennung einer Lampenstörung sowie zur Erfassung der an der Entladungsstrecke der Lampe anliegenden Spannung.
Further features, advantages and features will now be explained with reference to the figures of the accompanying drawings and to a detailed description of exemplary embodiments.
Fig. 1
shows a first embodiment of the invention in a schematic way,
Fig. 2
shows a further embodiment of the invention, and
Fig. 3
shows a further principal possibility for detecting a lamp failure and for detecting the voltage applied to the discharge path of the lamp voltage.

In Fig. 1 ist schematisch eine Ausführungsform der vorliegenden Erfindung dargestellt. Wie bekannt, weist auch das erfindungsgemäße Vorschaltgerät einen Wechselrichter 1 mit zwei in Serie geschalteten, an einer Gleichspannungsquelle Ubus angeschlossenen und abwechselnd getakteten Transistor-Schaltern 17 und 18 (T 1 bzw. T 2) auf. Das Schalten kann dabei durch eine Steuereinheit 23 erfolgen, die als integrierte Schaltung (IC) und insbesondere in einem ASIC realisiert werden kann. An dem Knotenpunkt der beiden Schalter 17 und 18 ist ein Lastkreis 3 angeschlossen, der einen Serienresonanzkreis 22 und die Lampe 4 aufweist. Der Serienresonanzkreis 22 besteht dabei aus einer Resonanzinduktivität 16 (LR ) und einem Resonanzkondensator 5 (CR ). Die Entladungsstrecke der Gasentladungslampe 4 zwischen den beiden Heizwendeln 8 und 9 ist, wie bekannt, parallel zu dem Resonanzkondensator 5 (CR) geschaltet.In Fig. 1 schematically an embodiment of the present invention is shown. As is known, the ballast according to the invention has an inverter 1 with two series-connected, connected to a DC voltage source U bus and alternately clocked transistor switches 17 and 18 ( T 1 and T 2 ) on. The switching can be effected by a control unit 23, which can be realized as an integrated circuit (IC) and in particular in an ASIC. At the junction of the two switches 17 and 18, a load circuit 3 is connected, which has a series resonant circuit 22 and the lamp 4. The series resonant circuit 22 consists of a resonance inductor 16 ( L R ) and a resonant capacitor 5 ( C R ). The discharge path of the gas discharge lamp 4 between the two heating coils 8 and 9 is, as known, connected in parallel with the resonance capacitor 5 (C R ) .

Parallel zu dem Koppelkondensator 2 (CK ) ist ein hochohmiger Widerstand 12 (RK ) geschaltet, so dass unter Umgehung des Koppelkondensators 2 (CK ) ein geringer Gleichstrom IDc durch die obere Heizwendel 8 sowie einen später noch im Detail erläuterten Spannungsteiler 7 fließen kann.Parallel to the coupling capacitor 2 ( C K ), a high-resistance resistor 12 ( R K ) is connected, so that bypassing the coupling capacitor 2 ( C K ) a low DC current I Dc through the upper heating coil 8 and a voltage divider explained later in detail. 7 can flow.

Wie in Fig. 1 ersichtlich, ist erfindungsgemäß ein Spannungsteiler 7 mit den Widerständen 14 und 15 (R 1 bzw. R 2) parallel zu der Parallelschaltung der Gasentladungslampe 4 und des Resonanzkondensators 5 (CR ) geschaltet. Genauer gesagt ist der Spannungsteiler 7 auf der von dem Koppelkondensator 2 (CK) abgewandten Seite der Lampe 4 vorgesehen und somit, betrachtet von dem Wechselrichter 1 aus, der oberen Heizwendel 8 nachgeschaltet. Wie bereits erwähnt, fließt infolge des hochohmigen Parallelwiderstandes 12 ein Gleichstrom IDC durch die Widerstände 14 und 15 (R 1 bzw. R 2) des Spannungsteilers 7. An dem Schaltungsknoten 11 zwischen den beiden Widerständen 14 und 15 des Spannungsteilers 7 wird ein Messsignal 10b (Sensorsignal S2) abgegriffen, das nach einer Analog-Digital-Wandlung einer (digitalen) Auswerteschaltung 13 zugeführt werden kann. Diese Auswerteschaltung 13 kann ebenfalls als integrierte Schaltung implementiert sein. Der Spannungsteiler 7 zusammen mit dem Signalabgriff 11 stellt somit eine Sensorschaltung 6 zum Erkennen einer Lampenstörung wie auch zur Erfassung der Lampenspannung dar.As in Fig. 1 can be seen, according to the invention, a voltage divider 7 with the resistors 14 and 15 ( R 1 and R 2 ) connected in parallel to the parallel connection of the gas discharge lamp 4 and the resonance capacitor 5 ( C R ). More specifically, the voltage divider 7 is provided on the side facing away from the coupling capacitor 2 (C K ) side of the lamp 4 and thus, as viewed from the inverter 1, the upper heating coil 8 downstream. As already mentioned, as a result of the high-impedance parallel resistor 12, a direct current I DC flows through the resistors 14 and 15 ( R 1 or R 2 ) of the voltage divider 7. At the circuit node 11 between the two resistors 14 and 15 of the voltage divider 7, a measurement signal 10b is generated (Sensor signal S2) tapped, which after an analog-to-digital conversion of a (digital) evaluation circuit 13 can be supplied. This evaluation circuit 13 can also be implemented as an integrated circuit. The voltage divider 7 together with the signal tap 11 thus represents a sensor circuit 6 for detecting a lamp failure as well as for detecting the lamp voltage.

Die Funktion der erfindungsgemäßen Schaltung soll nunmehr erläutert werden. Die Auswerteschaltung 13 kann abhängig von dem Wert des Sensorsignals 10b (S2) die folgenden Leuchtzustände erkennen:The function of the circuit according to the invention will now be explained. The evaluation circuit 13 can detect the following luminous states depending on the value of the sensor signal 10b (S2):

Wenn keine Lampe 4 in die Fassungen der Leuchte eingesetzt ist oder aber wenn die obere Heizwendel 8 der Gasentladungslampe 4 gebrochen ist, kann kein Gleichstrom IDC durch diese Heizwendel 8 und somit durch den Spannungsteiler 7 fließen. Dementsprechend fällt an dem Spannungsteiler 7 in diesem Fall auch keine Gleichspannung ab. Im ungezündeten Zustand liegt somit für den Fall einer Lampenstörung lediglich eine Wechselspannung entsprechend dem Schwingverhalten des Serienresonanzkreises 22 an dem Spannungsteiler 7 an. Dies kann wie gesagt auf Grundlage des Sensorsignals 10b (S2) durch die Auswerteschaltung 13 erfasst werden. Für diesen Fall der Lampenstörung müssen unter Umständen sofort Maßnahmen getroffen werden, da beispielsweise ohne eingesetzte Lampe 4 an dem Ausgang des Wechselrichters 1 sehr hohe Spannungen auftreten können. Eine Maßnahme, die dann durch die Auswerteschaltung 13 veranlasst wird, kann dementsprechend in einer Systemabschaltung bzw. wenigstens in der Abschaltung des Wechselrichters 1 bestehen.If no lamp 4 is inserted into the sockets of the lamp or if the upper heating coil 8 of the gas discharge lamp 4 is broken, no direct current I DC can flow through this heating coil 8 and thus through the voltage divider 7. Accordingly, no DC voltage drops at the voltage divider 7 in this case. In the non-ignited state, therefore, there is only one in the event of a lamp failure AC voltage according to the vibration behavior of the series resonant circuit 22 to the voltage divider 7. As already stated, this can be detected by the evaluation circuit 13 on the basis of the sensor signal 10b (S2). Under certain circumstances, measures may have to be taken immediately in this case of the lamp failure, since, for example, very high voltages can occur at the output of the inverter 1 without the use of a lamp 4. A measure, which is then caused by the evaluation circuit 13, can accordingly consist of a system shutdown or at least shutdown of the inverter 1.

Für den Fall, dass eine Lampe 4, bei der wenigstens die obere Heizwendel 8 ordnungsgemäß arbeitet, in die dafür vorgesehenen Fassungen der Leuchte eingesetzt ist, kann durch diese obere Heizwendel 8 und somit auch durch den Spannungsteiler 7 ein Gleichstrom IDC fließen. Auf Grundlage des Sensorsignals 10b (S2) wird die Auswerteschaltung 13 in diesem Fall eine um einen Gleichspannungsabfall an dem Spannungsteiler 7 verschobene Wechselspannung erfassen.In the event that a lamp 4, in which at least the upper heating coil 8 is working properly, is inserted into the lamp sockets provided for this purpose, a direct current I DC can flow through this upper heating coil 8 and thus also through the voltage divider 7. On the basis of the sensor signal 10b (S2), the evaluation circuit 13 will detect in this case an AC voltage shifted by a DC voltage drop across the voltage divider 7.

Die an der Lampe 4 abfallende Wechselspannung wird also in jedem Fall gemessen. Abhängig davon, ob eine Lampe 4 mit ordnungsgemäßer oberer Heizwendel 8 eingesetzt ist oder nicht, ist diese Wechselspannung gegebenenfalls um die an dem Spannungsteiler abfallende Gleichspannung verschoben.The voltage drop across the lamp 4 AC voltage is thus measured in each case. Depending on whether or not a lamp 4 with proper upper heating coil 8 is inserted, this alternating voltage is possibly shifted by the DC voltage dropping at the voltage divider.

Es ist darauf hinzuweisen, dass der hochohmige Widerstand 12 (RK) im Parallelzweig des Koppelkondensators 2 (CK) weiterhin den Vorteil aufweist, dass er das sogenannte "Walmen", d.h. abwechselnd helle und dunkle Abschnitte in der Gasentladungslampe 4, durch Bereitstellung eines gewissen Gleichstromanteils zumindest stark verringern kann.It should be noted that the high-resistance resistor 12 (R K ) in the parallel branch of the coupling capacitor 2 (C K ) further has the advantage that it so-called "Walmen", ie alternately bright and dark sections in the gas discharge lamp 4, by providing a can at least greatly reduce certain DC component.

Fig. 2 zeigt eine weitere Ausführungsform der vorliegenden Erfindung. Bei dieser Ausführungsform erfolgt die Einkopplung der Heizleistung in die Heizwendeln 8 und 9 induktiv über die zwei Spulen 19 und 20 (L h1 bzw. L h2) eines Übertragers. Während eine kapazitive Einkopplung der Heizleistung in der Regel bei nicht gedimmten Geräten bevorzugt wird, wird bei gedimmten Geräten die induktive Form der Heizleistungseinkopplung bevorzugt. Fig. 2 shows a further embodiment of the present invention. In this embodiment, the coupling of the heating power takes place in the heating coils 8 and 9 inductively via the two coils 19 and 20 ( L h 1 and L h 2 ) of a transformer. While a capacitive coupling of the heating power is usually preferred for non-dimmed devices, the dimmed devices, the inductive form of Heizkraftseinkopplung is preferred.

In dieser Zeichnung ist auch schematisch dargestellt, dass als Primärwicklung für die induktive Heizleistungsübertragung die Primärwicklung 21 (L h3) eines gesonderten Transformators verwendet werden kann. Alternativ ist möglich, die Resonanzinduktivität 16 (LR ) als Primärwicklung zur induktiven Einkopplung der Heizleistung in die Heizwendeln 8 und 9 der Gasentladungslampe 4 zu verwenden.In this drawing is also shown schematically that the primary winding 21 ( L h 3 ) of a separate transformer can be used as a primary winding for the inductive heating power transmission. Alternatively, it is possible to use the resonance inductance 16 ( L R ) as a primary winding for the inductive coupling of the heating power into the heating coils 8 and 9 of the gas discharge lamp 4.

Festzuhalten ist ferner, dass im Zusammenhang mit der vorliegenden Erfindung jegliche Art der Einkopplung der Heizleistung in die Heizwendeln 8 und 9 angewendet werden kann.It should also be noted that in connection with the present invention, any type of coupling of the heating power in the heating coils 8 and 9 can be applied.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

Nr.No. Komponente bzw. SignalComponent or signal 11 Wechselrichter, realisiert als zwei in Serie geschaltete selbstsperrende n-Kanal-MOSFETs T 1 und T 2 Inverter implemented as two series-connected normally-off n-channel MOSFETs T 1 and T 2 22 Koppelkondensator CK im Serienresonanzkreis 22Coupling capacitor C K in the series resonant circuit 22nd 33 Lastkreis, bestehend aus einem Serienresonanzkreis 22 und einer Gasentladungslampe 4Load circuit, consisting of a series resonant circuit 22 and a gas discharge lamp. 4 44 Gasentladungslampe im Lastkreis 3Gas discharge lamp in the load circuit 3 55 Resonanzkondensator CR des Serienresonanzkreises 22Resonant capacitor C R of the series resonant circuit 22nd 66 Sensorschaltung (realisiert als Spannungsteiler 7 mit den Widerständen R1 und R2) zur Erkennung einer Störung der Gasentladungslampe 4 sowie zur Erfassung eines Spannungsabfalls an der Gasentladungslampe 4Sensor circuit (realized as a voltage divider 7 with the resistors R 1 and R 2 ) for detecting a disturbance of the gas discharge lamp 4 and for detecting a voltage drop across the gas discharge lamp. 4 77 Spannungsteiler, verwendet als Sensorschaltung 6Voltage divider used as sensor circuit 6 88th erste (obere) Heizwendel der Gasentladungslampe 4first (upper) heating coil of the gas discharge lamp 4 99 zweite (untere) Heizwendel der Gasentladungslampe 4second (lower) heating coil of the gas discharge lamp 4 10a10a Spannungsabfall am Messwiderstand 26 (Sensorsignal S1)Voltage drop across measuring resistor 26 (sensor signal S1) 10b10b Ausgangsspannung der Sensorschaltung 6 (Sensorsignal S2)Output voltage of the sensor circuit 6 (sensor signal S2) 1111 Schaltungsknoten in der Mitte des Spannungsteilers 7Circuit node in the middle of the voltage divider 7th 1212 hochohmiger Widerstand RK im Parallelzweig des Koppelkondensators CK high-impedance resistor R K in the parallel branch of the coupling capacitor C K 1313 Auswerteschaltung zur Auswertung des Sensorsignals 10Evaluation circuit for evaluating the sensor signal 10 1414 erster (oberer) Widerstand R 1 des Spannungsteilers 7first (upper) resistor R 1 of the voltage divider 7th 1515 zweiter (unterer) Widerstand R 2 des Spannungsteilers 7second (lower) resistor R 2 of the voltage divider 7th 1616 Resonanzinduktivität LR des Serienresonanzkreises 22Resonant inductance L R of the series resonant circuit 22 1717 erster getakteter Transistor-Schalter (realisiert als selbstsperrender n-Kanal-MOSFET T 1)first clocked transistor switch (realized as a self-blocking n-channel MOSFET T 1 ) 1818 zweiter getakteter Transistor-Schalter (realisiert als selbstsperrender n-Kanal-MOSFET T2 )second clocked transistor switch (realized as a self-blocking n-channel MOSFET T 2 ) 1919 Induktivität L h1 (realisiert als Primärwicklung eines Heiztransformators Tr 1) zur induktiven Einkopplung der Heizleistung in die erste (obere) Heizwendel 8 der Gasentladungslampe 4Inductance L h 1 (realized as a primary winding of a heating transformer Tr 1 ) for inductive coupling of the heating power in the first (upper) heating coil 8 of the gas discharge lamp. 4 2020 Induktivität Lh2 (realisiert als Primärwicklung eines Heiztransformators Tr 2) zur induktiven Einkopplung der Heizleistung in die zweite (untere) Heizwendel 9 der Gasentladungslampe 4Inductance L h2 (implemented as a primary winding of a heating transformer Tr 2 ) for inductive coupling of the heating power in the second (lower) heating coil 9 of the gas discharge lamp. 4 2121 Induktivität Lh3 (realisiert als Primärwicklung eines Heiztransformators Tr 3) zur induktiven Einkopplung der Heizleistung in die Heizwendeln der Gasentladungslampe 4Inductance L h3 (realized as a primary winding of a heating transformer Tr 3 ) for inductive coupling of the heating power in the heating coils of the gas discharge lamp. 4 2222 Serienresonanzkreis als Teil des Lastkreises 3Series resonant circuit as part of the load circuit 3 2323 Steuereinheit (realisiert als IC bzw. ASIC) zur Ansteuerung der beiden als selbstsperrende n-Kanal-MOSFETs T 1 und T 2 realisierten Transistor-Schalter 17 und 18Control unit (implemented as IC or ASIC) for driving the two realized as a self-locking n-channel MOSFETs T 1 and T 2 transistor switch 17 and 18th 2424 Koppelkondensator C h1 im Einkoppelzweig der ersten (oberen) Heizwendel 8 der Gasentladungslampe 4Coupling capacitor C h 1 in Einkoppelzweig the first (upper) heating coil 8 of the gas discharge lamp. 4 2525 Koppelkondensator Ch2 im Einkoppelzweig der zweiten (unteren) Heizwendel 9 der Gasentladungslampe 4Coupling capacitor C h2 in Einkoppelzweig the second (lower) heating coil 9 of the gas discharge lamp. 4 2626 Messwiderstand R, in Serie geschaltet zu der zweiten (unteren) Heizwendel der Gasentladungslampe 4Measuring resistor R , connected in series with the second (lower) heating coil of the gas discharge lamp. 4

Claims (10)

  1. Ballast for operating a gas discharge lamp comprising heating filaments (8, 9), having:
    - an inverter (1), which has two switches (17, 18), which are in series, are connected to a DC voltage source (Ubus ) and are switched in the push-pull mode, and which is connected to a load circuit (3) by means of a coupling capacitor (2), which load circuit has the gas discharge lamp (4) having a potential-conducting heating filament (8) and a series resonant circuit (22),
    characterized in that the ballast further has:
    - a sensor circuit (6), which is connected to the potential-conducting heating filament (8) of the gas discharge lamp (4) and detects a single measurement signal, and
    - an evaluation circuit (13) for the combined identification of a lamp fault, in particular a filament breakage of the potential-conducting heating filament (8), and of the lamp voltage present at the gas discharge lamp (4) on the basis of the single measurement signal (10b),
    wherein a high-resistance resistor (12) is connected in parallel with the coupling capacitor (2) and with the potential-conducting heating filament (8), wherein when a gas discharge lamp (4) without a lamp fault is inserted, a direct current (IDC) flows through the potential-conducting heating filament (8) via the high-resistance resistor (12).
  2. Ballast according to Claim 1, in which the evaluation circuit (13) identifies, on the basis of the direct current (IDC) which is not flowing, that no gas discharge lamp (4) has been inserted or the potential-conducting heating filament (8) is broken.
  3. Ballast according to one of the preceding claims, characterized in that the sensor circuit (6) is integrated in an ASIC.
  4. Ballast according to one of Claims 1 to 3, characterized in that the heating power is coupled into the filaments (8, 9) of the gas discharge lamp (4) inductively via two coils (19, 20).
  5. Ballast according to Claim 4, characterized in that an inductance (16) of the series resonant circuit acts as primary winding for inductively coupling the heating power into the filaments (8, 9) of the lamp (4).
  6. Ballast according to one of the preceding claims, characterized in that the evaluation circuit (13) is designed to disconnect at least the inverter (1) when the direct current (IDC) is not flowing.
  7. Method for detecting the lamp voltage and for identifying a lamp fault in a ballast for gas discharge lamps (4) according to Claim 1, having the following steps:
    - detecting the single measurement signal (10b),
    - determining a lamp voltage and identifying a filament breakage of the potential-conducting heating filament (8) of the gas discharge lamp (4) on the basis of the single measurement signal (10b),
    wherein when a gas discharge lamp (4) without a lamp fault is inserted, a direct current (IDC) flows through the potential-conducting heating filament (8) via a high-resistance resistor (12) in parallel with a coupling capacitor (2).
  8. Method according to Claim 7, in which it is identified, on the basis of the direct current (IDC) which is not flowing, that no gas discharge lamp (4) has been inserted or the potential-conducting heating filament (8) is broken.
  9. Method according to either of Claims 7 and 8, in which on identification of the direct current (IDC) which is not flowing, at least the inverter is disconnected.
  10. Method according to one of Claims 7 to 9, in which the filament current is monitored during a preheating and starting phase, and the direct current (IDC) is monitored during normal operation.
EP08155561.7A 2002-02-18 2003-02-03 Light sensor for a pre-switching device for operating a gas discharge light Expired - Lifetime EP1945008B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10206731.7A DE10206731B4 (en) 2002-02-18 2002-02-18 Lamp sensor for a ballast for operating a gas discharge lamp
EP03704522A EP1477046B1 (en) 2002-02-18 2003-02-03 Lamp sensor for a choke for operating a gas discharge lamp

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP03704522A Division EP1477046B1 (en) 2002-02-18 2003-02-03 Lamp sensor for a choke for operating a gas discharge lamp
EP03704522.6 Division 2003-02-03

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EP1945008A1 EP1945008A1 (en) 2008-07-16
EP1945008B1 true EP1945008B1 (en) 2013-09-11

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EP08155561.7A Expired - Lifetime EP1945008B1 (en) 2002-02-18 2003-02-03 Light sensor for a pre-switching device for operating a gas discharge light

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CN (1) CN1633830B (en)
AT (1) ATE464774T1 (en)
AU (1) AU2003206824A1 (en)
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KR20110083823A (en) * 2010-01-15 2011-07-21 삼성전자주식회사 Detecting circuit of arc noise, light source driving apparatus having the same and method of driving a light source using the same
CN106896244B (en) * 2017-04-12 2023-10-10 江苏伊施德创新科技有限公司 Aging clamp and method for testing contact condition and aging result by using same

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CN1633830A (en) 2005-06-29
DE10206731A1 (en) 2003-08-28
EP1477046B1 (en) 2010-04-14
AU2003206824A1 (en) 2003-09-04
DE50312613D1 (en) 2010-05-27
DE10206731B4 (en) 2016-12-22
WO2003069963A1 (en) 2003-08-21
CN1633830B (en) 2010-06-30
EP1477046A1 (en) 2004-11-17
EP1945008A1 (en) 2008-07-16
ATE464774T1 (en) 2010-04-15

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