EP1202612B1 - Lighting system with improved preheating of discharge lamps - Google Patents

Lighting system with improved preheating of discharge lamps Download PDF

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Publication number
EP1202612B1
EP1202612B1 EP01123438A EP01123438A EP1202612B1 EP 1202612 B1 EP1202612 B1 EP 1202612B1 EP 01123438 A EP01123438 A EP 01123438A EP 01123438 A EP01123438 A EP 01123438A EP 1202612 B1 EP1202612 B1 EP 1202612B1
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EP
European Patent Office
Prior art keywords
lamp
frequency
gas discharge
lighting system
impedance network
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EP01123438A
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German (de)
French (fr)
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EP1202612A3 (en
EP1202612A2 (en
Inventor
Alfons Lechner
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP1202612A3 publication Critical patent/EP1202612A3/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

Definitions

  • the invention relates to a lighting system consisting of an electronic control gear and at least one gas discharge lamp with helices. Especially the preheating of the gas discharge lamps should be improved.
  • FIG. 1 In an electronic control gear for gas discharge lamps fed an AC generator G, which works at a frequency that is much higher than the grid frequency, energy in a load circuit.
  • the AC generator G is connected to a Load circuit consisting of a lamp inductor L1, a resonance capacitor C1 and a gas discharge lamp Lp connected.
  • the following is the gas discharge lamp called lamp for short.
  • the lamp inductor L1 and the resonance capacitor C1 a series resonant circuit, the the AC generator G is connected.
  • the lamp Lp is parallel to the Resonant capacitor C1 connected. This configuration is not just for operation the lamp Lp suitable, but also allows the ignition of the lamp.
  • the load circuit Before the Ignition of the lamp, the load circuit is a high-quality series resonant circuit. If this resonant circuit is excited with its resonant frequency, then arises over the Lamp Lp high voltage, which leads to the ignition of the lamp. To increase the The life of the lamp must be before the ignition of the coils W1 and W2 Lamp Lp preheated. To realize the preheating has in FIG 1 circuit proven proven.
  • the resonance capacitor C1 is not directly with the lamp inductor L1 and the AC generator G. Much more the connection to the lamp choke L1 is made via the helix W1 and the connection to the AC generator G via the coil W2.
  • EP 848 581 A1 proposes a heating circuit for spirals, with which the heating current can be adjusted during operation.
  • Fig. 8 and in Column 4 / lines 2-24 of this document discloses an impedance network (12 ', 11) which between a helical connection of a first coil (6) and a helical connection a second coil (7) is connected.
  • the in EP 848 581 A1 (Naakka) described impedance network is designed so that when operating a lamp only low current flows through the coils to save energy.
  • EP 848 581 A1 has no indication of how to design the impedance network is, so when preheating enough heating current at low lamp voltage flows.
  • This task is provided by a lighting system having the features of the preamble of the claim 1 solved by the features of the characterizing part of claim 1.
  • For lighting systems with multiple lamps applies according to claim 4.
  • Especially advantageous embodiments can be found in the dependent claims.
  • the above-described resonance capacitor C 1 is replaced by An impedance network that has the following characteristics:
  • the impedance function of the impedance network has a zero at the frequency f1.
  • the impedance network over the Spirals W1, W2 connected in series to the lamp inductor L1.
  • the series connection of the Impedance network with the lamp inductor L1 has an impedance function with a zero at frequency f1.
  • For preheating gives the AC voltage generator G now a voltage whose essential spectral component at a frequency which is close to the frequency f1 for the zero point of the impedance function of the Impedance network is located.
  • Near the frequency f1 describes in this context a frequency range of 0.8 * f1 to 1.2 * f1. This is the tension at the Lamp low (below the non-ignition voltage) and at the same time is a sufficiently high Current through the coils W1, W2 feasible, the preheating time under a Second allowed.
  • To ignite the AC voltage generator G is a voltage whose essential spectral component is at a frequency close to the frequency f2 for the zero point of the impedance function of the series circuit, consisting of the lamp inductor L1 and the impedance network is located.
  • a preheating circuit according to the invention can also be used for lighting systems several lamps are used. Here are all combinations of parallel and Series connection possible.
  • parallel connection several lamp circuits, an impedance network according to the invention, a lamp choke and a Lamp included, connected in parallel.
  • series circuit only the Lamps are connected in series. Then it is sufficient the inventive Impedance network, each with a helical connection of the first and the last Lamp to connect the series connection of lamps.

Abstract

The system has an electronic operating device and a gas discharge lamp with coils. Each coil has a terminal connected to an impedance network whose impedance function has a null point at a frequency close to a frequency that the electronic operating device produces before ignition of the gas discharge lamp.

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Beleuchtungssystem, das aus einem elektronischen Betriebsgerät und mindestens einer Gasentladungslampe mit Wendeln besteht. Insbesondere soll der Vorheizvorgang der Gasentladungslampen verbessert werden.The invention relates to a lighting system consisting of an electronic control gear and at least one gas discharge lamp with helices. Especially the preheating of the gas discharge lamps should be improved.

Stand der TechnikState of the art

In einem elektronischen Betriebsgerät für Gasentladungslampen speist ein Wechselspannungsgenerator G, der bei einer Frequenz arbeitet die wesentlich höher liegt als die Netzfrequenz, Energie in einen Lastkreis. In Figur 1 ist dieser Sachverhalt in einem Prinzipschaltbild dargestellt. Der Wechselspannungsgenerator G ist an einen Lastkreis, bestehend aus einer Lampendrossel L1, einem Resonanzkondensator C1 und einer Gasentladungslampe Lp, angeschlossen. Im folgenden wird die Gasentladungslampe kurz Lampe genannt. Meist bildet, wie in Figur 1 dargestellt, die Lampendrossel L1 und der Resonanzkondensator C1 einen Serienschwingkreis, der an den Wechselspannungsgenerator G angeschlossen ist. Die Lampe Lp ist parallel zum Resonanzkondensator C1 geschaltet. Diese Konfiguration ist nicht nur zum Betrieb der Lampe Lp geeignet, sondern ermöglicht auch die Zündung der Lampe. Vor der Zündung der Lampe stellt der Lastkreis einen Serienschwingkreis hoher Güte dar. Wird dieser Schwingkreis mit seiner Resonanzfrequenz angeregt, so entsteht über der Lampe Lp eine hohe Spannung, die zur Zündung der Lampe führt. Zur Erhöhung der Lebensdauer der Lampe müssen vor der Zündung die Wendeln W1 und W2 der Lampe Lp vorgeheizt werden. Zur Realisierung der Vorheizung hat sich die in Figur 1 dargestellte Schaltung bewährt. Der Resonanzkondensator C1 wird nicht direkt mit der Lampendrossel L1 und dem Wechselspannungsgenerator G verbunden. Vielmehr erfolgt der Anschluss zur Lampendrossel L1 über die Wendel W1 und der Anschluss zum Wechselspannungsgenerator G über die Wendel W2. Zum Vorheizen gibt der Wechselspannungsgenerator G eine Spannung ab, deren Frequenz deutlich über der Resonanzfrequenz des Serienschwingkreises, bestehend aus der Lampendrossel L1 und dem Resonanzkondensator C1, liegt. Somit führen die Wendeln W1, W2 bereits vor der Zündung Strom und werden vorgeheizt. Dieser Vorheizvorgang führt jedoch in ein Dilemma: Zum einen muss der Vorheizstrom stark genug sein, um die Wendeln in einer Zeit, die im Bereich einer Sekunde sein soll, auf die notwendige Temperatur aufzuheizen. Dazu darf die Frequenz der Spannung, die der Wechselspannungsgenerators G während der Vorheizung abgibt, nicht zu hoch gewählt werden. Zum anderen darf während der Vorheizung die Spannung an der Lampe Lp nicht zu hoch sein, da es sonst zu wendelschädigenden Glimmentladungen kommt. Dazu darf die Frequenz der Spannung, die der Wechselspannungsgenerators G während der Vorheizung abgibt, nicht zu niedrig gewählt werden. Maßgeblich dafür ist die vom Lampenhersteller angegebene Nichtzündspannung. Sie darf während der Vorheizung nicht überschritten werden. Für viele Lampen gibt es keine Frequenz für die während der Vorheizung vom Wechselspannungsgenerators G abgegebene Spannung, für die beide o. g. Bedingungen erfüllt sind. Alle möglichen Frequenzen liegen entweder zu nahe an der Resonanzfrequenz des Serienschwingkreises, bestehend aus Lampendrossel L1 und Resonanzkondensators C1, und ergeben somit eine zu hohe Spannung an der Lampe Lp, oder sie sind zu weit von der Resonanzfrequenz entfernt und ergeben somit einen zu niedrigen Vorheizstrom.In an electronic control gear for gas discharge lamps fed an AC generator G, which works at a frequency that is much higher than the grid frequency, energy in a load circuit. In Figure 1, this fact is in one Block diagram shown. The AC generator G is connected to a Load circuit consisting of a lamp inductor L1, a resonance capacitor C1 and a gas discharge lamp Lp connected. The following is the gas discharge lamp called lamp for short. Most forms, as shown in Figure 1, the lamp inductor L1 and the resonance capacitor C1 a series resonant circuit, the the AC generator G is connected. The lamp Lp is parallel to the Resonant capacitor C1 connected. This configuration is not just for operation the lamp Lp suitable, but also allows the ignition of the lamp. Before the Ignition of the lamp, the load circuit is a high-quality series resonant circuit. If this resonant circuit is excited with its resonant frequency, then arises over the Lamp Lp high voltage, which leads to the ignition of the lamp. To increase the The life of the lamp must be before the ignition of the coils W1 and W2 Lamp Lp preheated. To realize the preheating has in FIG 1 circuit proven proven. The resonance capacitor C1 is not directly with the lamp inductor L1 and the AC generator G. Much more the connection to the lamp choke L1 is made via the helix W1 and the connection to the AC generator G via the coil W2. To preheat gives the AC generator G from a voltage whose frequency is well above the Resonant frequency of the series resonant circuit, consisting of the lamp inductor L1 and the resonance capacitor C1. Thus, the coils W1, W2 already lead electricity before ignition and are preheated. However, this preheating process leads in a dilemma: First, the preheating current must be strong enough to the coils in a time that should be in the range of one second to the necessary temperature heat. To do this, the frequency of the voltage, that of the AC generator G during preheating, not too high. On the other hand, during preheating the voltage at the lamp Lp must not be too high be high, otherwise it comes to spiral damaging glow discharges. This is allowed the frequency of the voltage that the AC generator G during the Preheating issues, not too low. Decisive for this is the from Lamp manufacturer specified non-ignition voltage. It is allowed during preheating not be exceeded. For many lamps, there is no frequency for the while the preheating of the AC generator G output voltage for the both o. g. Conditions are met. All possible frequencies are either too close to the resonant frequency of the series resonant circuit, consisting of lamp choke L1 and resonance capacitor C1, and thus give too high a voltage at the lamp Lp, or they are too far from the resonant frequency and result thus a too low preheating.

In der Schrift EP 848 581 A1 (Naakka) wird eine Heizschaltung für Wendeln vorgeschlagen, mit der der Heizstrom im Betrieb eingestellt werden kann. In Fig. 8 und in Spalte 4 / Zeilen 2-24 dieser Schrift ist ein Impedanznetzwerk (12', 11) offenbart, das zwischen einem Wendelanschluß einer ersten Wendel (6) und einem Wendelanschluß einer zweiten Wendel (7) angeschlossen ist. Das in EP 848 581 A1 (Naakka) beschriebene Impedanznetzwerk ist so ausgelegt, dass beim Betrieb einer Lampe nur geringer Strom durch die Wendeln fließt, um Energie zu sparen. Es gibt in EP 848 581 A1 (Naakka) keine Hinweise darauf, wie das Impedanznetzwerk auszulegen ist, damit bei der Vorheizung genügend Heizstrom bei geringer Lampenspannung fließt. The document EP 848 581 A1 (Naakka) proposes a heating circuit for spirals, with which the heating current can be adjusted during operation. In Fig. 8 and in Column 4 / lines 2-24 of this document discloses an impedance network (12 ', 11) which between a helical connection of a first coil (6) and a helical connection a second coil (7) is connected. The in EP 848 581 A1 (Naakka) described impedance network is designed so that when operating a lamp only low current flows through the coils to save energy. There are in EP 848 581 A1 (Naakka) has no indication of how to design the impedance network is, so when preheating enough heating current at low lamp voltage flows.

Darstellung der ErfindungPresentation of the invention

Es ist nun Aufgabe der vorliegenden Erfindung, ein Beleuchtungssystem bereitzustellen, bei dem die Lampen in kurzer Zeit vorgeheizt werden können, ohne dass die für die Lampen angegebene Nichtzündspannung überschritten wird. Diese Aufgabe wird durch ein Beleuchtungssystem mit den Merkmalen des Oberbegriffs des Anspruchs 1 durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst. Für Beleuchtungssysteme mit mehreren Lampen gilt entsprechend Anspruch 4. Besonders vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen.It is an object of the present invention to provide a lighting system, in which the lamps can be preheated in a short time, without the for the lamps specified non-ignition voltage is exceeded. This task is provided by a lighting system having the features of the preamble of the claim 1 solved by the features of the characterizing part of claim 1. For lighting systems with multiple lamps applies according to claim 4. Especially advantageous embodiments can be found in the dependent claims.

Erfindungsgemäß wird der oben beschriebene Resonanzkondensator C 1 ersetzt durch ein Impedanznetzwerk, das folgende Eigenschaften aufweist: Die Impedanzfunktion des Impedanznetzwerks besitzt eine Nullstelle bei der Frequenz f1. Entsprechend den obigen Ausführungen zum Stand der Technik, ist das Impedanznetzwerk über die Wendeln W1, W2 in Serie zur Lampendrossel L1 geschaltet. Die Serienschaltung des Impedanznetzwerks mit der Lampendrossel L1 besitzt eine Impedanzfunktion mit einer Nullstelle bei der Frequenz f1. Zum Vorheizen gibt der Wechselspannungsgenerator G nun eine Spannung ab, deren wesentlicher Spektralanteil bei einer Frequenz liegt, die nahe der Frequenz f1 für die Nullstelle der Impedanzfunktion des Impedanznetzwerks liegt. "Nahe der Frequenz f1" beschreibt in diesem Zusammenhang einen Frequenzbereich von 0,8*f1 bis 1,2*f1. Dadurch ist die Spannung an der Lampe niedrig (unter der Nichtzündspannung) und gleichzeitig ist ein genügend hoher Strom durch die Wendeln W1, W2 realisierbar, der eine Vorheizzeit unter einer Sekunde erlaubt. Zum Zünden gibt der Wechselspannungsgenerator G eine Spannung ab, deren wesentlicher Spektralanteil bei einer Frequenz liegt, die nahe der Frequenz f2 für die Nullstelle der Impedanzfunktion der Serienschaltung, bestehend aus der Lampendrossel L1 und dem Impedanznetzwerk, liegt.According to the invention, the above-described resonance capacitor C 1 is replaced by An impedance network that has the following characteristics: The impedance function of the impedance network has a zero at the frequency f1. According to the The above discussion of the prior art, the impedance network over the Spirals W1, W2 connected in series to the lamp inductor L1. The series connection of the Impedance network with the lamp inductor L1 has an impedance function with a zero at frequency f1. For preheating gives the AC voltage generator G now a voltage whose essential spectral component at a frequency which is close to the frequency f1 for the zero point of the impedance function of the Impedance network is located. "Near the frequency f1" describes in this context a frequency range of 0.8 * f1 to 1.2 * f1. This is the tension at the Lamp low (below the non-ignition voltage) and at the same time is a sufficiently high Current through the coils W1, W2 feasible, the preheating time under a Second allowed. To ignite the AC voltage generator G is a voltage whose essential spectral component is at a frequency close to the frequency f2 for the zero point of the impedance function of the series circuit, consisting of the lamp inductor L1 and the impedance network is located.

Eine einfache Ausgestaltung des Impedanznetzwerks besteht aus der Serienschaltung eines Kondensators und einer Spule. Hat der Kondensator die Kapazität C und die Spule die Induktivität L, so liegt die Nullstelle der Impedanzfunktion bei der Frequenz f 1 = 1/2π LC .A simple embodiment of the impedance network consists of the series connection of a capacitor and a coil. If the capacitor has the capacitance C and the coil has the inductance L, then the zero point of the impedance function lies at the frequency f 1 = 1 / 2π LC ,

Eine erfindungsgemäße Vorheizschaltung kann auch für Beleuchtungssysteme mit mehreren Lampen eingesetzt werden. Dabei sind alle Kombinationen aus Parallel-und Serienschaltung möglich. Bei der Parallelschaltung werden mehrere Lampenkreise, die ein erfindungsgemäßes Impedanznetzwerk, eine Lampendrossel und eine Lampe enthalten, parallel geschaltet. Bei der Serienschaltung werden lediglich die Lampen in Serie geschaltet werden. Dann ist es ausreichend das erfindungsgemäße Impedanznetzwerk mit jeweils einem Wendelanschluss der ersten und der letzten Lampe der Serienschaltung von Lampen zu verbinden.A preheating circuit according to the invention can also be used for lighting systems several lamps are used. Here are all combinations of parallel and Series connection possible. In parallel connection, several lamp circuits, an impedance network according to the invention, a lamp choke and a Lamp included, connected in parallel. In the series circuit, only the Lamps are connected in series. Then it is sufficient the inventive Impedance network, each with a helical connection of the first and the last Lamp to connect the series connection of lamps.

Beschreibung der ZeichnungenDescription of the drawings

Es zeigen:

Figur 1
ein Prinzipschaltbild zum Stand der Technik
Figur 2
ein Schaltbild eines bevorzugten Ausführungsbeispiels der Erfindung
Show it:
FIG. 1
a schematic diagram of the prior art
FIG. 2
a circuit diagram of a preferred embodiment of the invention

Figur 1 wurde bereits in den Ausführungen zum Stand der Technik erläutert.Figure 1 has already been explained in the comments on the prior art.

In Figur 2 ist der Wechselspannungsgenerator G als Halbbrückenwechselrichter ausgeführt. Diese Schaltung hat sich für Betriebgeräte für Lampen wegen ihrer niedrigen Kosten und ihrer Zuverlässigkeit verbreitet. Sie besteht im wesentlichen aus einer Serienschaltung zweier Schalter S1 und S2. Sie wird gespeist von einer Gleichspannungsquelle DC. Soll die Halbbrücke an einem Wechselstromnetz betrieben werden, so sind zwischen Netzanschluss und Halbbrücke geeignete Schaltungen einzufügen, die eine Gleichspannungsquelle nachbilden. In der Praxis können für die Schalter S1 und S2 alle Halbleiterschalter wie z.B. Bipolartransistor, FET oder IGBT eingesetzt werden. Die Schalter S1 und S2 werden abwechselnd ein- und ausgeschaltet. Damit steht am Verbindungspunkt der Schalter S1 und S2 eine Wechselspannung zur Verfügung. An diesem Verbindungspunkt ist die Serienschaltung bestehend aus einer Lampendrossel L21, einer Lampe Lp und einem Koppelkondensator C22 angeschlossen. Das andere Ende dieser Serienschaltung ist mit dem Plus- oder Minuspol der Gleichspannungsquelle DC verbunden. Da die Lampe die Wendeln W1 und W2 beinhaltet, besitzt sie vier Anschlüsse; zwei für jede Wendel. Jeweils ein Anschluss einer Wendel wird für die Serienschaltung mit Lampendrossel L21 und Koppelkondensator C22 verwendet. Zwischen den jeweils anderen Anschlüssen ist erfindungsgemäß ein Impedanznetzwerk bestehend aus der Serienschaltung eines Kondensators C21 und einer Spule L22 geschaltet. Der Kondensator C22 dient zum Abtrennen des Gleichanteils der von der Halbbrücke gelieferten Wechselspannung. Zum Vorheizen wird nun die Halbbrücke so getaktet, dass sie eine rechteckförmige Wechselspannung mit einer Frequenz f1 abgibt, die nahe bei der Resonanzfrequenz des Serienschwingkreises bestehend aus dem Kondensator C21 und der Spule L22 liegt. Für ein Beleuchtungssystem mit einer 20W Leuchtstofflampe sind folgende Werte geeignet:

  • Lampendrossel L21: 1,7mH
  • Kondensator C21: 2,7nF
  • Spule L22: 1,8mH
  • Koppelkondensator C22: 100nF
  • Vorheizfrequenz f1: 65kHz
    • In Figure 2, the AC voltage generator G is designed as a half-bridge inverter. This circuit has become popular for lamp operating devices because of their low cost and reliability. It consists essentially of a series connection of two switches S1 and S2. It is powered by a DC voltage source DC. If the half-bridge is to be operated on an alternating current network, suitable circuits are to be inserted between the grid connection and the half bridge, which emulate a direct voltage source. In practice, all semiconductor switches such as bipolar transistor, FET or IGBT can be used for the switches S1 and S2. The switches S1 and S2 are alternately turned on and off. Thus, an alternating voltage is available at the connection point of the switches S1 and S2. At this connection point, the series circuit consisting of a lamp inductor L21, a lamp Lp and a coupling capacitor C22 is connected. The other end of this series circuit is connected to the positive or negative pole of the DC voltage source DC. Since the lamp includes the coils W1 and W2, it has four terminals; two for each helix. One connection each of a helix is used for the series connection with lamp choke L21 and coupling capacitor C22. Between the respective other terminals according to the invention an impedance network consisting of the series connection of a capacitor C21 and a coil L22 is connected. The capacitor C22 serves to separate the DC component of the AC voltage supplied by the half-bridge. For preheating, the half-bridge is then clocked so that it emits a rectangular alternating voltage with a frequency f1, which is close to the resonance frequency of the series resonant circuit consisting of the capacitor C21 and the coil L22. For a lighting system with a 20W fluorescent lamp, the following values are suitable:
  • Lamp choke L21: 1.7mH
  • Capacitor C21: 2.7nF
  • Coil L22: 1,8mH
  • Coupling capacitor C22: 100nF
  • Preheat frequency f1: 65kHz

    • Claims (4)

    1. Lighting system which includes an electronic operating device and a gas discharge lamp (Lp) with two filaments (W1, W2), a filament terminal of one filament (W1) being connected via an impedance network (L22, C21) to a filament terminal of the other filament (W2), characterized in that the impedance network (L22, C21) has an impedance function having a zero point at a frequency (f1) which is close to a frequency which the electronic operating device generates before the starting of the gas discharge lamp (Lp) in order to preheat the filaments (W1, W2).
    2. Lighting system according to Claim 1, characterized in that the impedance network (L22, C21) includes a series circuit of a capacitor (C21) and an inductor (L22).
    3. Lighting system according to Claim 1, characterized in that the electronic operating device includes a half-bridge inverter.
    4. Lighting system which includes an electronic operating device and a number of series-connected gas discharge lamps (Lp) with filaments (W1, W2), a filament terminal of the first and a filament terminal of the last gas discharge lamp (Lp) of the series circuit being connected to one another via an impedance network (L22, C21), characterized in that the impedance network (L22, C21) has an impedance function having a zero point at a frequency (f1) which is close to a frequency which the electronic operating device generates before the starting of the gas discharge lamp (Lp) in order to preheat the filaments (W1, W2).
    EP01123438A 2000-10-30 2001-09-28 Lighting system with improved preheating of discharge lamps Expired - Lifetime EP1202612B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10053803A DE10053803A1 (en) 2000-10-30 2000-10-30 Lighting system with gentle preheating of gas discharge lamps
    DE10053803 2000-10-30

    Publications (3)

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    EP1202612A2 EP1202612A2 (en) 2002-05-02
    EP1202612A3 EP1202612A3 (en) 2003-11-19
    EP1202612B1 true EP1202612B1 (en) 2005-06-29

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    US (1) US6788001B2 (en)
    EP (1) EP1202612B1 (en)
    AT (1) ATE298970T1 (en)
    CA (1) CA2360052A1 (en)
    DE (2) DE10053803A1 (en)

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    Also Published As

    Publication number Publication date
    US20020050797A1 (en) 2002-05-02
    EP1202612A3 (en) 2003-11-19
    DE50106617D1 (en) 2005-08-04
    DE10053803A1 (en) 2002-05-08
    EP1202612A2 (en) 2002-05-02
    US6788001B2 (en) 2004-09-07
    ATE298970T1 (en) 2005-07-15
    CA2360052A1 (en) 2002-04-30

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