EP0914754A1 - Dispositif d'allumage pour une lampe a decharge et procede pour allumer une lampe a decharge - Google Patents

Dispositif d'allumage pour une lampe a decharge et procede pour allumer une lampe a decharge

Info

Publication number
EP0914754A1
EP0914754A1 EP98933472A EP98933472A EP0914754A1 EP 0914754 A1 EP0914754 A1 EP 0914754A1 EP 98933472 A EP98933472 A EP 98933472A EP 98933472 A EP98933472 A EP 98933472A EP 0914754 A1 EP0914754 A1 EP 0914754A1
Authority
EP
European Patent Office
Prior art keywords
winding
connection
ignition device
ignition
voltage
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.)
Withdrawn
Application number
EP98933472A
Other languages
German (de)
English (en)
Inventor
Günther Hirschmann
Jürgen Becker
Gerhard Behr
Christian Wittig
Peter Helbig
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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
Priority claimed from DE1997121149 external-priority patent/DE19721149A1/de
Priority claimed from DE19803139A external-priority patent/DE19803139A1/de
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0914754A1 publication Critical patent/EP0914754A1/fr
Withdrawn legal-status Critical Current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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • 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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices

Definitions

  • Ignition device for a discharge lamp and method for igniting a discharge lamp
  • the invention relates to an ignition device for a discharge lamp according to the preamble of claim 1 or 13 and a method for igniting a discharge lamp.
  • the invention relates to an ignition device for a high-pressure discharge lamp, for example a low-wattage metal halide high-pressure discharge lamp for a motor vehicle headlight.
  • the high-pressure discharge lamp has a gas-tight discharge vessel. Two gas discharge electrodes protrude into the discharge space and are electrically conductively connected to external power supplies. During the operation of the discharge lamp, a light-emitting discharge arc is formed between its gas discharge electrodes.
  • an operating device is required which supplies the discharge lamp with electrical energy and which limits the discharge current via the discharge arc.
  • the operating device also comprises an ignition device for the discharge lamp which initiates the gas discharge.
  • an ignition voltage of a few kilovolts is necessary when the lamp is cold, while an ignition voltage of more than 20 kN may be required to re-ignite the same lamp - that is, to ignite it while it is still hot.
  • the operating voltage of the high-pressure discharge lamp ie the voltage drop across the discharge path required to maintain the discharge arc, to only about 80 V to 100 V.
  • the ignition device can be designed, for example, as a pulse ignition device which detects one of the two gas discharge electrodes of the high-pressure discharge lamp during the discharge Ignition phase applied with unipolar high-voltage pulses.
  • An ignition device corresponding to the preamble of claim 1 is disclosed in the PCT application with the international publication number WO 97/04624.
  • This ignition device is a pulse ignition device for a high-pressure discharge lamp.
  • the pulse ignition device has an ignition transformer with a primary and a secondary winding, an ignition capacitor, a resistance element, via which the ignition capacitor is charged, and an automatic switch.
  • One connection of the secondary winding is connected to one of the gas discharge electrodes of the high-pressure discharge lamp, while its other connection is connected to the voltage input of the ignition device.
  • the primary winding of the ignition transformer and the switching path of the automatic switch are arranged in such a way that the discharge current of the ignition capacitor flows through them.
  • the ignition transformer Since the ignition voltage required for the hot re-ignition of the high-pressure discharge lamp is considerably higher than the voltage present at the voltage input of the ignition device, the ignition transformer must have a correspondingly high transmission ratio.
  • the large transmission ratio of the ignition transformer means that the known and commercially available ignition devices require a large amount of space due to the large-volume ignition transformer. That's why it is in the case of low-wattage metal halide high-pressure discharge lamps which are intended for use in motor vehicle headlights, it is not possible to accommodate the ignition device for these lamps in the lamp base.
  • the object of the invention to provide an improved ignition device for a discharge lamp and an improved method for igniting a discharge lamp.
  • the ignition device should have a construction which is as compact as possible, so that it can still be accommodated in the lamp base even in the case of the low-wattage metal halide high-pressure discharge lamps used in motor vehicle headlights, which have a very small construction.
  • the ignition device has a transformer which has a parallel connection consisting of at least two primary windings and at least one secondary winding, the parallel connection of the primary windings being inductively coupled to the at least one secondary winding.
  • This measure allows the number of turns on the secondary side of the transformer to be considerably reduced for a given transformation ratio of the transformer without the inductive coupling between the primary and secondary side being impaired by the low number of turns of the primary windings.
  • the induction voltage available on the secondary side does not change if the gear ratio is maintained.
  • the primary windings advantageously each have a maximum of two turns. This also reduces the number of turns of the at least one secondary winding in accordance with the desired transmission ratio.
  • a transformer with two primary windings connected in parallel each having two turns
  • the primary windings connected in parallel can advantageously each consist of a copper strip.
  • the reduction in the number of turns on the secondary side enables a compact construction of the transformer and of the entire ignition device, so that all components of the ignition device, including the transformer, can be accommodated in the lamp base.
  • the high-voltage pulses for igniting the gas discharge are then generated within the lamp base and are therefore no longer accessible from the outside.
  • the use of a transformer with a ferrite core and a coil former which has at least one chamber for the transformer windings has proven to be advantageous.
  • the ferrite core advantageously consists of a high-resistance material, so that the ferrite core has an electrical resistance of more than 1 M ⁇ .
  • E-cores or cylindrical cores such as, for example, cylinder cores, tube cores or thread cores, are advantageously used as ferrite bodies.
  • the ignition device comprises a capacitor, a resistance element, an automatic switch and a transformer with at least two primary windings connected in parallel and with at least one secondary winding.
  • the components of the ignition device are arranged and interconnected in such a way that the condenser sensor discharges abruptly to ignite the gas discharge in the lamp, the discharge current of the capacitor flowing through the parallel connection of the primary windings and over the switching path of the automatic switch, so that one of the Gas discharge electrodes of the lamp are acted upon by the voltage pulses induced in the at least one secondary winding.
  • the ignition device is designed as an asymmetrical pulse ignition device which applies only one of the lamp electrodes to unipolar ignition voltage pulses.
  • the transformer has only one secondary winding, which is connected to a connection of the ignition voltage output for the discharge lamp.
  • the ignition device is designed as a symmetrical pulse ignition device which simultaneously applies unipolar ignition voltage pulses of opposite polarity to both gas discharge electrodes of the lamp.
  • This mode of operation has compared to the asymmetrical pulse ignition device the advantage of lower cable losses and lower requirements for the electrical insulation of the high voltage lamp parts.
  • the particularly preferred second exemplary embodiment of the pulse ignition device has a transformer with two primary windings connected in parallel, both of which are discharged during the ignition phase of the lamp by the discharge current of the capacitor of the ignition device discharging abruptly over the switching path of the automatic switch, and two secondary windings both are inductively coupled to the parallel connection of the primary windings.
  • the two secondary windings are each connected via a connection of the ignition voltage output to a gas discharge electrode of the lamp and arranged in such a way that unipolar high-voltage pulses of opposite polarity are induced in the two secondary windings by the aforementioned discharge current.
  • the transformer belonging to the ignition device has a primary winding with at most two turns, which according to the invention consists of a wide metal strip which encloses the at least one secondary winding and advantageously also the ferrite body of the transformer.
  • This measure allows the number of turns on the secondary side of the transformer to be significantly reduced for a given transformation ratio of the transformer without the inductive coupling between the primary and secondary side being impaired by the low number of turns of the primary winding.
  • the use of a transformer with a ferrite core and a coil former, which has at least one chamber for the at least one secondary winding, has proven to be advantageous.
  • the ferrite core advantageously consists of a material which has an electrical resistance of more than 1 M ⁇ .
  • E-cores or cylindrical cores such as, for example, cylinder cores, tube cores or threaded cores, are advantageously used as ferrite bodies.
  • Figure 1 is a schematic circuit diagram of an asymmetrical ignition device according to the first embodiment of the invention
  • Figure 2 is a schematic circuit diagram of a symmetrical ignition device according to the second embodiment of the invention.
  • FIG. 3 is a schematic representation of the transformer of the ignition device according to the invention with a 4-chamber coil body and ferrite core
  • Figure 4 is a schematic representation of the transformer of the ignition device according to the invention with a 5-chamber coil body and ferrite core
  • Figure 5 is a schematic circuit diagram of an asymmetrical ignition device according to the fourth embodiment of the invention.
  • FIG. 1 the circuit diagram of an asymmetrical pulse ignition device according to the first embodiment of the invention is shown.
  • This ignition device is used to ignite a gas discharge in a halogen Metal vapor high-pressure discharge lamp LP1, which has an electrical nominal output of 35 watts and which is operated, for example, in a motor vehicle headlight.
  • the ignition device consists of a transformer TRl with two primary windings NIO, Nil and a secondary winding N12, a capacitor Cl, a resistance element R1, a spark gap F1 and a diode Dl.
  • the ignition device has a DC voltage input with a first j10 and a second DC voltage connection jll and an ignition voltage output with a first jl2 and a second ignition voltage connection jl3.
  • the ignition device is provided with a DC voltage of approximately 400 V, which is generated, for example, by a voltage converter (not shown) from the on-board electrical system voltage of the motor vehicle.
  • the DC voltage connection j10 is at +400 V and the other DC voltage connection is at ground potential.
  • the positive connection j10 is connected to a connection of the capacitor C1 via a branch point V10.
  • the other connection of the capacitor C1 is connected via a further branching point VI 1 and via the ohmic resistor R1 and via the diode D1 polarized in the forward direction to the DC voltage connection j11 which is at ground potential.
  • a charging current for the capacitor C1 flows through the resistance element R1 and the diode D1, so that the capacitor C1 is charged to approximately 350 V.
  • the branch point V10 is connected to the start of the winding of the secondary winding N12 of the transformer TR1 and to the beginning of the windings of the primary windings N10, Nil of the transformer TR1 arranged in a parallel connection.
  • the winding end of the secondary winding N12 is connected to the ignition voltage terminal j12 of the ignition voltage output, which in turn is connected to a gas discharge electrode E10 of the lamp LP1 when the lamp LP1 is installed.
  • the other ignition voltage connection jl3 which contacts the second gas discharge electrode EH of the lamp when the lamp is installed, is connected to the DC voltage connection jll, which is at ground potential, of the DC voltage input of the ignition device.
  • the two primary windings NIO, Nil of the transformer TR1 are connected in parallel. That is, the winding start of the first primary winding NIO is connected to the winding start of the second primary winding Nil and the winding end of the first primary winding NIO is connected to the winding end of the second primary winding Nil.
  • the beginning of the winding of the transformer windings N10, Nil, N12 are each identified in FIG. 1 by a point above the corresponding winding.
  • the start of the winding of both primary windings NIO, Nil connected in parallel is connected to the branching point V10, while the winding end of both primary windings NIO, Nil is connected to a connection of the spark gap F1.
  • the other connection of the spark gap F1 is connected to the second branch point VI 1.
  • the transformer TRl has a coil body S with four chambers S1, S2, S3, S4 and a cylindrical ferrite core Kl, which is arranged in an axially extending recess in the coil body S.
  • the secondary winding N12 has 320 turns and consists of a copper strand with a diameter of 0.3 mm. It is wound evenly over the four chambers S1 to S4 of the bobbin S.
  • the two primary windings NIO, Nil each have two turns and each consist of a 20-strand copper strand, with each wire of the copper strand having a diameter of 0.1 mm. Both primary windings N10, Nil are separated by an electrical insulation and wound over the secondary winding N12.
  • the ferrite core Kl is approximately in the winding axis of the transformer winding lungs NIO, Nil, N12 arranged.
  • the ferrite body has an electrical resistance of more than 1 M ⁇ .
  • the capacitor C1 is charged via the resistor R1 and via the diode D1 polarized in the forward direction. If the voltage drop across the capacitor C1 reaches a value of approximately 350 V, the spark gap F1 breaks through, that is to say spray discharges occur on the spark gap, so that the capacitor C1 is connected in parallel with the two primary windings NIO, Nil and over the spark gap Fl discharged intermittently.
  • This discharge current flowing through the two primary windings NIO, Nil induces in the secondary winding N12, which is inductively coupled to both primary windings, high-voltage pulses of positive polarity, with which the gas discharge electrode E10 of the discharge lamp LP1 connected to the winding end of the secondary winding N12 is applied, and the gas discharge ignite in the lamp LP1.
  • the voltage pulses at the ignition voltage output jl2 and at the lamp electrode E10 reach values of up to +25 kV and have a width of approx. 300 ns.
  • the other lamp electrode EH is at ground potential.
  • FIG. 2 shows the circuit diagram of a symmetrical pulse ignition device according to the particularly preferred second exemplary embodiment of the invention.
  • This ignition device is also used to ignite a gas discharge in a metal halide high-pressure discharge lamp LP2, which has an electrical nominal power of 35 watts and which is operated, for example, in a motor vehicle headlight.
  • the ignition device consists of a transformer TR2 with two primary windings N20, N21 and two secondary windings N22, N23, a capacitor C2, a resistance element R2, a spark gap F2 and a diode D2.
  • the ignition device has a DC voltage input with a first j20 and a second DC voltage connection j21 and an ignition voltage output with a first j22 and a second ignition voltage connection j23.
  • the ignition device is provided with a DC voltage of approximately 400 V, which is generated, for example, by a voltage converter (not shown) from the on-board electrical system voltage of the motor vehicle.
  • the DC voltage connection j20 is at +400 V and the other DC voltage connection j21 is at ground potential.
  • the positive terminal j20 is connected to a terminal of the capacitor C2 via a branch point V20.
  • the other connection of the capacitor C2 is connected to the DC voltage connection j21, which is at ground potential, via a further branching point V21 and via the Olim resistor R2 and via the diode D2 polarized in the forward direction.
  • a charging current for the capacitor C2 flows through the resistor element R2 and the diode D2, so that the capacitor C2 is charged to approximately 350 V.
  • the branch point V20 is connected to the start of the winding of the first secondary winding N22 of the transformer TR2 and to the beginning of the windings of the primary windings N20, N21 of the transformer TR2 arranged in a parallel connection.
  • the winding end of the first secondary winding N22 is connected to the ignition voltage connection j22 of the ignition voltage output, which in turn, when the lamp LP2 is installed, is connected to a gas discharge electrode E20 of the lamp LP2.
  • the other ignition voltage connection j23 which contacts the second gas discharge electrode E21 of the lamp LP2 when the lamp is installed, is connected to the start of the winding of the second secondary winding N23.
  • the winding end of the second secondary winding N23 is connected to the DC voltage connection j21 of the DC voltage input of the ignition device which is at ground potential.
  • the two primary windings N20, N21 of the transformer TR2 are connected in parallel. That is, the winding start of the first primary winding N20 is connected to the winding start of the second primary winding N21 and the winding end of the first primary winding N20 is connected to the winding end of the second primary winding N21.
  • the beginning of the winding of the transformer windings N20, N21, N22, N23 are each identified in FIG. 2 by a point above the corresponding winding.
  • the start of the winding of both primary windings N20, N21 connected in parallel is connected to the branch point V20, while the end of the winding of both primary windings N20, N21 is connected to a connection of the spark gap F2.
  • the other connection of the spark gap F2 is connected to the second branch point V21.
  • the two secondary windings N22, N23 are inductively coupled to the parallel connection of the primary windings N20, N21 in such a way that induction voltages of opposite polarity are generated in them.
  • the transformer TR2 of the ignition device has a coil body S 'with five chambers S1', S2 ', S3', S4 ', S5' and a cylindrical ferrite core K2, which is arranged in an axially extending recess in the coil body S '.
  • the two primary windings N20, N21 of the transformer TR2 each have two windings and each consist of a 20-wire copper strand, each wire of the copper strand having a diameter of 0.1 mm.
  • the two secondary windings N22, N23 of the transformer TR2 each have 160 turns and each consist of a copper strand with a diameter of approximately 0.3 mm.
  • the two primary windings N20, N21 are arranged in the middle chamber S3 'of the bobbin S', while the first secondary winding N22 evenly over the first two chambers S1 ', S2' and the second secondary winding N23 over the last two chambers S4 ', S5' of the bobbin S ' divides are wrapped.
  • the two secondary windings N22, N23 are wound in opposite directions.
  • the ferrite core K2 is arranged approximately in the winding axis of the transformer windings N20, N21, N22, N23.
  • the ferrite body K2 has an electrical resistance of more than 1 M ⁇ .
  • the capacitor C2 is charged via the resistor R2 and via the diode D2 polarized in the forward direction. If the voltage drop across the capacitor C2 reaches a value of approximately 350 V, the spark gap F2 breaks through, that is to say spray discharges occur on the spark gap, so that the capacitor C2 is connected in parallel via the two primary windings N20, N21 and over the spark gap F2 discharges intermittently. This discharge current flowing through the two primary windings N20, N21 induces unipolar high-voltage pulses in the two secondary windings N22 and N23, both of which are inductively coupled to both primary windings N20, N21.
  • the high-voltage pulses induced in them have an opposite polarity, so that the first lamp electrode E20 via the connection j22 from the first secondary winding N22 with positive high-voltage pulses and the second lamp electrode E21 via the Negative high-voltage pulses are applied simultaneously to terminal j23 by the second secondary winding N23.
  • the positive voltage pulses at the ignition voltage output j22 and at the lamp electrode E20 reach values of up to +11 kV, while the negative voltage pulses at the ignition voltage output j23 and at the lamp electrode E21 assume values of up to - 11 kV, so that the voltage drop across the discharge path of the lamp LP2 is up to 22 kV during the ignition phase.
  • Table contains information on the dimensioning of the components of the two exemplary embodiments of the invention described in more detail above. Table: Dimensioning of the components used in the exemplary embodiments according to FIGS. 1 and 2
  • the third embodiment of the invention is largely identical to the first embodiment described above. It differs from the first embodiment only in the transformer.
  • the transformer of the third exemplary embodiment like the transformer of the first exemplary embodiment shown in FIG. 3, has a coil former with four chambers and a cylindrical ferrite core which is arranged in an axially extending recess in the coil former.
  • the secondary winding has 320 turns and consists of a copper strand with a diameter of 0.3 mm. It is wound evenly over the four chambers of the bobbin.
  • the transformer according to the third exemplary embodiment has only one primary winding.
  • This primary winding has two turns and consists of a wide copper strip, which, separated by an electrically insulating lacquer layer, is wound evenly over the secondary winding so that it encloses the secondary winding.
  • the ferrite core of the transformer is arranged approximately in the winding axis of the primary and secondary windings.
  • the ferrite body has an electrical resistance of more than 1 M ⁇ .
  • the third exemplary embodiment is identical to the first in all other details.
  • the ignition device (FIG. 5) has a transformer TR with two primary windings connected in parallel. - solve
  • an automatic switch designed as a spark gap F1, an ignition capacitor C3, a further capacitor C4, two chokes L1, L2, a DC voltage input J1, J2, J3 and an ignition voltage output J4, J5 .
  • the ignition capacitor C3 and the spark gap F1 are fastened on a metal plate shaped as a ring segment, with which they form a prefabricated structural unit.
  • an electrical connection of the ignition capacitor C3 and the spark gap Fl is connected to the metal plate by one or more welding spots.
  • This assembly also includes two metal strips and a wire welded to the metal plate, which serves as an electrical connection to the metal plate.
  • the first sheet metal strip is connected to the second electrical connection of the ignition capacitor C3 by one or more welding spots.
  • the second sheet metal strip is connected to the second electrical connection of the spark gap F1 by one or more welding spots.
  • One free end of each of the first and second sheet metal strips is provided with an electrical connection which serves for the electrical connection of the winding start and the winding end of the primary windings N1, N2 to the second connection of the ignition capacitor C3 and to the second connection of the spark gap Fl, respectively.
  • the ignition device shown in FIG. 5 has three DC voltage connections J1 (for -400V supply voltage), J2 (for + 600V supply voltage), J3 (is at ground potential or at ground potential), two of which are optionally used.
  • the DC voltage connection J1 is connected via the branch points V3, VI to the second connection of the ignition capacitor C3.
  • the first connection of the ignition capacitor C3 (68nF; 1000V) is connected to the DC voltage connection J2 and through the measurement tallplatte connected to the first terminal of the spark gap Fl.
  • the branch point V3 is connected to the ignition voltage output J4 via the secondary winding N3 of the transformer TR and the choke L1 connected downstream.
  • the branch point VI is connected to the start of the winding of the two primary windings N1, N2 connected in parallel.
  • the winding end of the two primary windings Nl, N2 is connected via the branch point V2 to the second connection of the spark gap F1.
  • the DC voltage connection J3 is connected to the ignition voltage output J5 via the choke L2.
  • the ignition device also has a further capacitor C4 (4.7nF; 1000V), the first connection of which is connected to the DC voltage connection J1 and the second connection of which is connected to the DC voltage connection J3.
  • the invention is not limited to the exemplary embodiments explained in more detail above.
  • an E core or a ring core or a U core can also be used instead of a cylindrical ferrite core in all the exemplary embodiments explained above for the transformer.
  • an equivalent automatic switch for example a semiconductor switch.
  • the diode Dl or D2 serves to protect the capacitor Cl or C2 in the event that the DC voltage connections of the DC voltage input of the ignition device are interchanged. It is not absolutely necessary for the functionality of the ignition device according to the invention.
  • the transformer TR of the ignition device according to the fourth embodiment can also have a second secondary winding, which is connected between the connections j3 and j5 in series with the inductor L2, so that from the asymmetrical ignition device of the fourth embodiment, a symmetrical ignition device, the two lamp electrodes with ignition voltage pulses is acted upon.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un dispositif d'allumage par impulsion et un procédé d'allumage pour une lampe à décharge, notamment une lampe à décharge à haute pression destinée à un projecteur de véhicule automobile. Ledit dispositif d'allumage présente un transformateur qui possède soit deux enroulements primaires montés en parallèle, qui sont tous les deux couplés par induction à au moins un enroulement secondaire, soit un enroulement primaire constitué d'une large bande métallique, qui est séparée par une isolation électrique et enroulée sur le ou les enroulements secondaires. Le dispositif d'allumage selon l'invention est conçu de manière compacte de façon à permettre le logement du dispositif d'allumage complet dans le culot de la lampe.
EP98933472A 1997-05-21 1998-05-08 Dispositif d'allumage pour une lampe a decharge et procede pour allumer une lampe a decharge Withdrawn EP0914754A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE1997121149 DE19721149A1 (de) 1997-05-21 1997-05-21 Zündvorrichtung für eine Entladungslampe und Verfahren zum Zünden einer Entladungslampe
DE19721149 1997-05-21
DE19803139 1998-01-28
DE19803139A DE19803139A1 (de) 1998-01-28 1998-01-28 Zündvorrichtung für eine Entladungslampe
PCT/DE1998/001272 WO1998053647A1 (fr) 1997-05-21 1998-05-08 Dispositif d'allumage pour une lampe a decharge et procede pour allumer une lampe a decharge

Publications (1)

Publication Number Publication Date
EP0914754A1 true EP0914754A1 (fr) 1999-05-12

Family

ID=26036694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98933472A Withdrawn EP0914754A1 (fr) 1997-05-21 1998-05-08 Dispositif d'allumage pour une lampe a decharge et procede pour allumer une lampe a decharge

Country Status (7)

Country Link
US (1) US6181081B1 (fr)
EP (1) EP0914754A1 (fr)
JP (1) JP2001501027A (fr)
KR (1) KR20000029460A (fr)
CN (1) CN1227041A (fr)
CA (1) CA2261316C (fr)
WO (1) WO1998053647A1 (fr)

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CA2261316C (fr) 2006-01-10
KR20000029460A (ko) 2000-05-25
WO1998053647A1 (fr) 1998-11-26
CN1227041A (zh) 1999-08-25
CA2261316A1 (fr) 1998-11-21
JP2001501027A (ja) 2001-01-23
US6181081B1 (en) 2001-01-30

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