EP0875129A1 - Gas discharge lamp - Google Patents

Gas discharge lamp

Info

Publication number
EP0875129A1
EP0875129A1 EP97947024A EP97947024A EP0875129A1 EP 0875129 A1 EP0875129 A1 EP 0875129A1 EP 97947024 A EP97947024 A EP 97947024A EP 97947024 A EP97947024 A EP 97947024A EP 0875129 A1 EP0875129 A1 EP 0875129A1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
gas discharge
output
voltage
potential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97947024A
Other languages
German (de)
French (fr)
Other versions
EP0875129B1 (en
Inventor
Karl-Heinrich Preis
Robert Kern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0875129A1 publication Critical patent/EP0875129A1/en
Application granted granted Critical
Publication of EP0875129B1 publication Critical patent/EP0875129B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H05B41/288—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 without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the invention relates to a device for operating a gas discharge lamp according to the preamble of the main claim. From DE-OS 42 18 647 is one
  • High-voltage discharge lamp device known.
  • the output voltage of the step-up direct voltage converter is fed to the high-voltage discharge lamp with alternately switched polarities.
  • a voltage is thus present at the gas discharge lamp, which alternates in a rectangular shape between the positive and negative values of the output voltage of the DC-DC converter.
  • With a constant frequency of the polarity reversal an average value of the voltage applied to the gas discharge lamp is obtained, which corresponds to the reference potential. If the gas discharge lamp is accommodated in a housing, which is also at this reference potential, there is no potential difference which prevents harmful ion migration in the lamp.
  • DE-PS 41 41 804 is to generate a potential difference between the gas discharge lamp and the environment a part is provided which is set to a potential which is positive in comparison with the gas discharge lamp. However, this arrangement is associated with additional manufacturing outlay.
  • the invention has for its object to provide a device for operating a gas discharge lamp, which enables a long service life of the gas discharge lamp.
  • a DC-DC converter converts one to one
  • Reference potential related input voltage into two different from the reference potential output potentials which are characterized in that their amounts are different in size.
  • Such a bipolar DC-DC converter has some specific advantages, which consist, for example, in the fact that the demands on the electronic components decrease due to more favorable voltage distributions. Circuit breakers or diodes with lower dielectric strength can be used.
  • an average potential arises which deviates from the reference potential.
  • the potential difference that arises in this way has a positive effect on the life of the gas discharge lamp in that it reduces interactions of the gas ions with the lamp body. Ion diffusions in the lamp body can be reduced.
  • a expedient improvement provides that a first output voltage, which relates the first output potential to the reference potential, has different polarity than a second output voltage, which relates the second output potential to the reference potential. If the gas discharge lamp is actuated alternately for the same time, an average output voltage is set, the value of which differs from the reference potential.
  • the gas discharge lamp is housed in a housing, the potential of which is at the reference potential. A potential difference is thus built up between the housing and the gas discharge lamp, which - as already explained - reduces ion migration.
  • the gas discharge lamp is preferably used in a headlight of a motor vehicle.
  • FIG. 1 shows a block diagram of an exemplary embodiment and FIG. 2 shows a typical voltage curve on a gas discharge lamp.
  • An input voltage 11 related to a reference potential 12 is converted by a DC-DC converter 10 into two output potentials, which can be tapped at a first output terminal 21 and at a second output terminal 22. If the first output potential is tapped at the first output terminal 21 and referred to the reference potential 12, the first output voltage 23 is obtained, and the second output potential tapped at the second output terminal 22 is obtained The second output voltage 24 results in reference potential 12.
  • the two output potentials are supplied to an circuit 15, which in turn supplies a gas discharge lamp 16.
  • the device according to the invention for operating a gas discharge lamp 16 works as follows:
  • the DC voltage converter 10 converts the input voltage 11 related to the reference potential 12 into a bipolar output voltage.
  • a DC voltage taken from a battery is used as input voltage 11, for example.
  • a bipolar DC voltage converter 10 is understood to be a DC voltage converter 10 which converts the input voltage 11 related to the reference potential 12 into two output potentials which are different from the reference potential 12.
  • Such DC-DC converters 10 are from the relevant
  • Single-ended flyback converters or single-ended forward converters can also be used, such as push-pull converters, in which a transformer is isolated.
  • a second output potential different from the reference potential 12 could also be achieved in that the current flowing on the primary side of the transformer via a diode and a smoothing capacitor of the first output terminal 21 while the current flowing on the secondary side is supplied to the second output terminal 22.
  • control circuit 15 can consist, for example, of an H-bridge in the
  • the gas discharge lamp 16 lies diagonally.
  • the first and the second output potential are always applied alternately to the connections of the gas discharge lamp 16 by suitable control of the four power switches.
  • the clocking in the exemplary embodiment is constant. Then it is ensured that an average value 25 is set, the potential of which is different from the reference potential 12.
  • a clocked polarity reversal circuit is also conceivable.
  • the control circuit 15 causes a rectangular
  • the first and second output voltages 23, 24 are alternately applied to the gas discharge lamp 16 with the same duration.
  • the average value 25 could also be realized by different time periods of the activation with respect to the first and second output potential. However, this increases the effort for the control.
  • the gas discharge lamp 16 can be used in particular in motor vehicles. If the lamp holder or the housing of the gas discharge lamp 16 is placed on the device ground, the desired potential difference arises.
  • the negative mean value 25 based on the device mass prevents the undesired ion migration.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

Disclosed is a device for operating a gas discharge lamp (16), comprising a DC/DC converter (10) which converts an input voltage (11) corresponding to the standard voltage into two output voltages differing from said standard voltage (12). The gas discharge lamp (16) is connected through an activating circuit (15) to those output voltage of different values.

Description

_ _ _ _
Vorrichtung zum Betreiben einer GasentladungslampeDevice for operating a gas discharge lamp
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zum Betreiben einer Gasentladungslampe nach der Gattung des Hauptanspruchs. Aus der DE-OS 42 18 647 ist eineThe invention relates to a device for operating a gas discharge lamp according to the preamble of the main claim. From DE-OS 42 18 647 is one
Hochspannungs-Entladungslampeneinrichtung bekannt. Hierbei wird die AusgangsSpannung des Aufwärts-Gleichspannungs- Wandlers der Hochspannungs-Entladungslampe mit abwechselnd umgeschalteten Polaritäten zugeführt. An der Gasentladungslampe liegt somit eine Spannung an, die rechteckformig zwischen dem positiven und negativen Wert der AusgangsSpannung des Gleichspannungswandlers abwechselt . Bei einer gleichbleibenden Frequenz der Polaritätsumkehr ergibt sich somit ein Mittelwert der an der Gasentladungslampe anliegenden Spannung, der dem Bezugspotential entspricht. Ist die Gasentladungslampe in einem Gehäuse untergebracht, das ebenfalls auf diesem Bezugspotential liegt, stellt sich keine Potentialdifferenz ein, die schädliche Ionenwanderungen in der Lampe unterbindet .High-voltage discharge lamp device known. Here, the output voltage of the step-up direct voltage converter is fed to the high-voltage discharge lamp with alternately switched polarities. A voltage is thus present at the gas discharge lamp, which alternates in a rectangular shape between the positive and negative values of the output voltage of the DC-DC converter. With a constant frequency of the polarity reversal, an average value of the voltage applied to the gas discharge lamp is obtained, which corresponds to the reference potential. If the gas discharge lamp is accommodated in a housing, which is also at this reference potential, there is no potential difference which prevents harmful ion migration in the lamp.
In der DE-PS 41 41 804 ist zur Erzeugung einer Potentialdifferenz zwischen Gasentladungslampe und Umgebung ein Teil vorgesehen, das auf ein im Vergleich zur Gasentladungslampe positives Potential gelegt wird. Diese Anordnung ist jedoch mit zusätzlichem fertigungstechnischen Aufwand verbunden.In DE-PS 41 41 804 is to generate a potential difference between the gas discharge lamp and the environment a part is provided which is set to a potential which is positive in comparison with the gas discharge lamp. However, this arrangement is associated with additional manufacturing outlay.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Betreiben einer Gasentladungslampe anzugeben, die eine hohe Lebensdauer der Gasentladungslampe ermöglicht.The invention has for its object to provide a device for operating a gas discharge lamp, which enables a long service life of the gas discharge lamp.
Die Aufgabe wird durch die im unabhängigen Anspruch angegebenen Merkmale gelöst.The object is achieved by the features specified in the independent claim.
Vorteile der ErfindungAdvantages of the invention
Ein Gleichspannungswandler wandelt eine auf einA DC-DC converter converts one to one
Bezugspotential bezogene EingangsSpannung in zwei vom Bezugspotential verschiedene Ausgangspotentiale um, die sich dadurch auszeichnen, daß ihre Beträge unterschiedlich groß sind. Ein solcher bipolarer Gleichspannungswandler weist einige spezifische Vorteile auf, die beispielsweise darin bestehen, daß aufgrund günstigerer Spannungsaufteilungen die Anforderungen an die elektronischen Bauteile abnehmen. So können Leistungsschalter oder Dioden geringerer Spannungsfestigkeit Verwendung finden. Darüber hinaus stellt sich bei wechselweiser Ansteuerung der Gasentladungslampe mit den beiden Ausgangspotentialen ein mittleres Potential ein, das von dem Bezugspotential abweicht. Die so entstehende Potentialdifferenz wirkt sich insofern positiv auf die Lebensdauer der Gasentladungslampe aus, als sie Wechselwirkungen der Gasionen mit dem Lampenkörper vermindert. Ionendiffusionen in den Lampenkörper lassen sich reduzieren.Reference potential related input voltage into two different from the reference potential output potentials, which are characterized in that their amounts are different in size. Such a bipolar DC-DC converter has some specific advantages, which consist, for example, in the fact that the demands on the electronic components decrease due to more favorable voltage distributions. Circuit breakers or diodes with lower dielectric strength can be used. In addition, when the gas discharge lamp is actuated alternately with the two output potentials, an average potential arises which deviates from the reference potential. The potential difference that arises in this way has a positive effect on the life of the gas discharge lamp in that it reduces interactions of the gas ions with the lamp body. Ion diffusions in the lamp body can be reduced.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen möglich. Eine zweckmäßige Verbesserung sieht vor, daß eine erste AusgangsSpannung, die das erste Ausgangspotential auf das Bezugspotential bezieht, unterschiedliche Polarität besitzt wie eine zweite AusgangsSpannung, die das zweite Ausgangspotential auf das Bezugspotential bezieht. Bei gleichdauernder wechselweiser Ansteuerung der Gasentladungslampe stellt sich eine mittlere AusgangsSpannung ein, deren Wert vom Bezugspotential verschieden ist.Advantageous further developments are possible through the measures listed in the dependent claims. A expedient improvement provides that a first output voltage, which relates the first output potential to the reference potential, has different polarity than a second output voltage, which relates the second output potential to the reference potential. If the gas discharge lamp is actuated alternately for the same time, an average output voltage is set, the value of which differs from the reference potential.
In einer Weiterbildung ist vorgesehen, daß die Gasentladungslampe in einem Gehäuse untergebracht wird, dessen Potential auf dem Bezugspotential liegt. Zwischen dem Gehäuse und der Gasentladungslampe wird somit eine Potentialdifferenz aufgebaut, die - wie bereits ausgeführt - Ionenwanderungen reduziert.In a further development it is provided that the gas discharge lamp is housed in a housing, the potential of which is at the reference potential. A potential difference is thus built up between the housing and the gas discharge lamp, which - as already explained - reduces ion migration.
Bevorzugte Verwendung findet die Gasentladungslampe in einem Scheinwerfer eines Kraftfahrzeugs.The gas discharge lamp is preferably used in a headlight of a motor vehicle.
Zeichnungdrawing
Es zeigen Figur 1 ein Blockschaltbild eines Ausführungsbeispiels sowie Figur 2 einen typischen Spannungsverlauf an einer Gasentladungslampe.FIG. 1 shows a block diagram of an exemplary embodiment and FIG. 2 shows a typical voltage curve on a gas discharge lamp.
Eine auf ein Bezugspotential 12 bezogene Eingangsspannung 11 wird durch einen Gleichspannungswandler 10 in zwei Ausgangspotentiale umgewandelt, die an einer ersten Ausgangsklemme 21 und an einer zweiten Ausgangsklemme 22 abgegriffen werden können. Wird das erste Ausgangspotential an der ersten Ausgangsklemme 21 abgegriffen und auf das Bezugspotential 12 bezogen, so erhält man die erste AusgangsSpannung 23, das an der zweiten Ausgangsklemme 22 abgegriffene zweite Ausgangspotential auf das Bezugspotential 12 bezogen ergibt die zweite AusgangsSpannung 24. Die beiden Ausgangspotentiale werden einer Ans euerSchaltung 15 zugeführt, die wiederum eine Gasentladungslampe 16 versorgt.An input voltage 11 related to a reference potential 12 is converted by a DC-DC converter 10 into two output potentials, which can be tapped at a first output terminal 21 and at a second output terminal 22. If the first output potential is tapped at the first output terminal 21 and referred to the reference potential 12, the first output voltage 23 is obtained, and the second output potential tapped at the second output terminal 22 is obtained The second output voltage 24 results in reference potential 12. The two output potentials are supplied to an circuit 15, which in turn supplies a gas discharge lamp 16.
Der zeitliche Verlauf einer Lampenspannung 26, wie er sich an der Gasentladungslampe 16 einstellen könnte, schwankt in zeitlich gleichbleibenden Abständen zwischen der ersten AusgangsSpannung 23 und der zweiten AusgangsSpannung 24. Hierbei stellt sich ein Mittelwert 25 dieser Lampenspannung 26 ein.The temporal course of a lamp voltage 26, as it could occur on the gas discharge lamp 16, fluctuates at constant intervals between the first output voltage 23 and the second output voltage 24. Here, an average value 25 of this lamp voltage 26 is established.
Die erfindungsgemäße Vorrichtung zum Betreiben einer Gasentladungslampe 16 arbeitet folgendermaßen:The device according to the invention for operating a gas discharge lamp 16 works as follows:
Der Gleichspannungswandler 10 wandelt die auf das Bezugspotential 12 bezogene EingangsSpannung 11 in eine bipolare AusgangsSpannung um. Als EingangsSpannung 11 dient beispielsweise eine einer Batterie entnommene Gleichspannung. Als bipolarer Gleichspannungswandler 10 wird in diesem Zusammenhang ein Gleichspannungswandler 10 verstanden, der die auf das Bezugspotential 12 bezogene Eingangsspannung 11 in zwei Ausgangspotentiale umwandelt, die vom Bezugspotential 12 verschieden sind. Solche Gleichspannungswandler 10 sind aus der einschlägigenThe DC voltage converter 10 converts the input voltage 11 related to the reference potential 12 into a bipolar output voltage. A DC voltage taken from a battery is used as input voltage 11, for example. In this context, a bipolar DC voltage converter 10 is understood to be a DC voltage converter 10 which converts the input voltage 11 related to the reference potential 12 into two output potentials which are different from the reference potential 12. Such DC-DC converters 10 are from the relevant
Fachliteratur bekannt. Eintakt-Sperrwandler oder Eintakt- Durchflußwandler können ebenso Verwendung finden wie beispielsweise Gegentakt-Wandler, bei denen eine transformatorische Potentialtrennung erfolgt. Neben einer transformatorischen Potentialtrennung könnte ein zweites vom Bezugspotential 12 verschiedenes Ausgangspotential auch dadurch erreicht werden, daß der primärseitig fließende Strom des Transformators über eine Diode und einem Glättungskondensator der ersten Ausgangsklemme 21, während der sekundärseitig fließende Strom der zweiten Ausgangsklemme 22 zugeführt wird.Technical literature known. Single-ended flyback converters or single-ended forward converters can also be used, such as push-pull converters, in which a transformer is isolated. In addition to a transformer isolation, a second output potential different from the reference potential 12 could also be achieved in that the current flowing on the primary side of the transformer via a diode and a smoothing capacitor of the first output terminal 21 while the current flowing on the secondary side is supplied to the second output terminal 22.
Diese beiden vom Bezugspotential 12 verschiedenen Ausgangspotentiale bilden die Eingangsgrößen der AnsteuerSchaltung 15. Diese sorgt dafür, daß der Gasentladungslampe 16 ein Wechselstrom zugeführt wird, da im Gleichstrom die Lebensdauer der Gasentladungslampe 16 stark beeinträchtigt würde . Die Ansteuerschaltung 15 kann beispielsweise aus einer H-Brücke bestehen, in derenThese two output potentials, which differ from the reference potential 12, form the input variables of the control circuit 15. This ensures that an alternating current is supplied to the gas discharge lamp 16, since the lifetime of the gas discharge lamp 16 would be severely impaired in direct current. The control circuit 15 can consist, for example, of an H-bridge in the
Diagonale die Gasentladungslampe 16 liegt. Durch geeignete Ansteuerung der vier Leistungsschalter wird immer abwechselnd das erste und das zweite Ausgangspotential an die Anschlüsse der Gasentladungslampe 16 gelegt. Die Taktung im Ausführungsbeispiel erfolgt gleichbleibend. Dann ist gewährleistet, daß sich ein Mittelwert 25 einstellt, dessen Potential unterschiedlich ist zum Bezugspotential 12. Ebenso ist eine getaktete Umpolschaltung denkbar.The gas discharge lamp 16 lies diagonally. The first and the second output potential are always applied alternately to the connections of the gas discharge lamp 16 by suitable control of the four power switches. The clocking in the exemplary embodiment is constant. Then it is ensured that an average value 25 is set, the potential of which is different from the reference potential 12. A clocked polarity reversal circuit is also conceivable.
Die AnsteuerSchaltung 15 bewirkt einen rechteckförmigenThe control circuit 15 causes a rectangular
Verlauf der Lampenspannung 26 gemäß Figur 2. Die erste und zweite AusgangsSpannung 23, 24 liegen abwechselnd mit der gleichen Zeitdauer an der Gasentladungslampe 16 an. Der Mittelwert 25 ließe sich ebenso durch unterschiedliche Zeitdauern der Ansteuerung bezüglich des ersten und zweiten Ausgangspotentials realisieren. Damit erhöht sich jedoch der Aufwand für die Ansteuerung.Course of the lamp voltage 26 according to FIG. 2. The first and second output voltages 23, 24 are alternately applied to the gas discharge lamp 16 with the same duration. The average value 25 could also be realized by different time periods of the activation with respect to the first and second output potential. However, this increases the effort for the control.
Die Gasentladungslampe 16 läßt sich insbesondere bei Kraftfahrzeugen einsetzen. Wird die Lampenfassung oder das Gehäuse der Gasentladungslampe 16 auf die Gerätemasse gelegt, so entsteht die gewünschte Potentialdifferenz. Der negative Mittelwert 25 bezogen auf die Gerätemasse verhindert die unerwünschten Ionenwanderungen. The gas discharge lamp 16 can be used in particular in motor vehicles. If the lamp holder or the housing of the gas discharge lamp 16 is placed on the device ground, the desired potential difference arises. The negative mean value 25 based on the device mass prevents the undesired ion migration.

Claims

Ansprüche Expectations
1. Vorrichtung zum Betreiben einer Gasentladungslampe (16), mit einem Gleichspannungswandler (10) , der eine auf ein Bezugspotential (12) bezogene Eingangsspannung (11) in zumindest zwei vom Bezugspotential (12) verschiedene Ausgangspotentiale umwandelt, wobei die Gasentladungslampe (16) über eine Ansteuerschaltung (15) auf diese1. Device for operating a gas discharge lamp (16), with a DC-DC converter (10), which converts an input voltage (11) related to a reference potential (12) into at least two output potentials different from the reference potential (12), the gas discharge lamp (16) a control circuit (15) on this
Ausgangspotentiale gebracht ist, dadurch gekennzeichnet, daß die Beträge der beiden Ausgangspotentiale unterschiedlich groß sind.Output potentials is brought, characterized in that the amounts of the two output potentials are of different sizes.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß eine erste AusgangsSpannung (23) , die das erste Ausgangspotential auf das Bezugspotential (12) bezieht, unterschiedliche Polarität besitzt wie eine zweite AusgangsSpannung (24) , die das zweite Ausgangspotential auf das Bezugspotential (12) bezieht.2. Device according to claim 1, characterized in that a first output voltage (23), which relates the first output potential to the reference potential (12), has different polarity than a second output voltage (24), which has the second output potential to the reference potential (12 ) relates.
3. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Gasentladungslampe (16) in einem Gehäuse untergebracht ist, dessen Potential auf dem Bezugspotential (12) liegt.3. Device according to one of the preceding claims, characterized in that the gas discharge lamp (16) is housed in a housing, the potential of which is at the reference potential (12).
4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Gasentladungslampe (16) in einem Scheinwerfer eines Kraftfahrzeugs angeordnet ist. 4. Device according to one of the preceding claims, characterized in that the gas discharge lamp (16) is arranged in a headlight of a motor vehicle.
EP97947024A 1996-11-13 1997-10-25 Gas discharge lamp Expired - Lifetime EP0875129B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19646861 1996-11-13
DE19646861A DE19646861C1 (en) 1996-11-13 1996-11-13 Device for operating a gas discharge lamp
PCT/DE1997/002486 WO1998021920A1 (en) 1996-11-13 1997-10-25 Gas discharge lamp

Publications (2)

Publication Number Publication Date
EP0875129A1 true EP0875129A1 (en) 1998-11-04
EP0875129B1 EP0875129B1 (en) 2000-01-12

Family

ID=7811526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97947024A Expired - Lifetime EP0875129B1 (en) 1996-11-13 1997-10-25 Gas discharge lamp

Country Status (7)

Country Link
US (1) US6078149A (en)
EP (1) EP0875129B1 (en)
JP (1) JP2000503469A (en)
KR (1) KR19990077118A (en)
DE (2) DE19646861C1 (en)
ES (1) ES2142692T3 (en)
WO (1) WO1998021920A1 (en)

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Publication number Priority date Publication date Assignee Title
KR100674423B1 (en) * 2001-01-19 2007-01-29 엘지전자 주식회사 Transmitting/receiving system and data processing method
GB2372646B (en) * 2001-02-26 2005-06-22 Cambridge Consultants Electronic circuits
DE102008025748A1 (en) 2008-05-29 2009-12-03 Automotive Lighting Reutlingen Gmbh Electrical circuit arrangement for controlling LEDs in lighting equipment of car, has energy source comprising component that is arranged in feedback branch arranged between load-sided connection of switch element and source

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Publication number Priority date Publication date Assignee Title
US5010279A (en) * 1985-08-26 1991-04-23 Lathom Michael S Switched capacitive ballasts for discharge lamps
EP0359860A1 (en) * 1988-09-23 1990-03-28 Siemens Aktiengesellschaft Device and method for operating at least one discharge lamp
JP2587720B2 (en) * 1990-10-19 1997-03-05 株式会社小糸製作所 Lighting circuit for vehicle discharge lamps
DE4141804C1 (en) * 1991-12-18 1993-02-25 Robert Bosch Gmbh, 7000 Stuttgart, De
DE4218647A1 (en) * 1992-01-27 1993-08-12 Mitsubishi Electric Corp HV gas-discharge lamp arrangement with DC voltage source - has one or two dc voltage converters followed by polarity reversing switch, with driver circuit and oscillator
JP2875129B2 (en) * 1993-01-05 1999-03-24 三菱電機株式会社 Vehicle discharge lamp lighting device
JP2879514B2 (en) * 1993-01-07 1999-04-05 株式会社小糸製作所 Lighting circuit for vehicle discharge lamps
JP3244859B2 (en) * 1993-04-12 2002-01-07 池田デンソー株式会社 Discharge lamp lighting device
JP3224948B2 (en) * 1994-08-30 2001-11-05 株式会社小糸製作所 Lighting circuit of discharge lamp

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Title
See references of WO9821920A1 *

Also Published As

Publication number Publication date
ES2142692T3 (en) 2000-04-16
JP2000503469A (en) 2000-03-21
KR19990077118A (en) 1999-10-25
WO1998021920A1 (en) 1998-05-22
DE19646861C1 (en) 1998-04-16
DE59701000D1 (en) 2000-02-17
EP0875129B1 (en) 2000-01-12
US6078149A (en) 2000-06-20

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