WO2009115117A1 - Système de lampe comportant une lampe à décharge et procédé de fonctionnement d'une lampe à décharge - Google Patents

Système de lampe comportant une lampe à décharge et procédé de fonctionnement d'une lampe à décharge Download PDF

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Publication number
WO2009115117A1
WO2009115117A1 PCT/EP2008/053255 EP2008053255W WO2009115117A1 WO 2009115117 A1 WO2009115117 A1 WO 2009115117A1 EP 2008053255 W EP2008053255 W EP 2008053255W WO 2009115117 A1 WO2009115117 A1 WO 2009115117A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
lamp system
electrodes
gas
gas discharge
Prior art date
Application number
PCT/EP2008/053255
Other languages
German (de)
English (en)
Inventor
Henning Rehn
Ulrich Hartwig
Matthias Morkel
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
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 Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Priority to PCT/EP2008/053255 priority Critical patent/WO2009115117A1/fr
Priority to TW098108519A priority patent/TW200945951A/zh
Publication of WO2009115117A1 publication Critical patent/WO2009115117A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/16—Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/26—Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/84—Lamps with discharge constricted by high pressure
    • H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
    • 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
    • H05B41/2885—Static converters especially adapted therefor; Control thereof

Definitions

  • the invention relates to a lamp system specified in the preamble of claim 1 and a method for operating a gas discharge lamp by means of an electronic ballast.
  • Such a lamp system comprises a gas discharge lamp with a lamp envelope, which is filled with a standing under a cold filling and consisting of a noble gas or noble gas mixture filling gas and within which two tungsten electrodes are arranged at a predetermined distance from each other , Furthermore, the lamp system comprises an electronic ballast, which is coupled to the electrodes of the gas discharge lamp and ⁇ is laid out to provide an AC feed signal for generating a arc discharge between the electrodes. Due to the thermal stress caused by the arc discharge generated during operation between the two electrodes, tungsten evaporates from them and settles on the inner wall of the lamp envelope. This leads to an undesirable blackening of the lamp bulb and a concomitant loss of light output and a significant reduction in the life of the lamp system.
  • the thermal stress of the anode-connected electrode may alternatively be determined by the choice of a larger diameter or by the can be lowered by cooling coils. Further, the geometry and the USAGE for each of the electrodes ⁇ terials can be adapted to each other such that a smallest possible electrode temperature is achieved, in which the gas discharge lamp is still stable. For example, it is known to carbonize the cathode as ge ⁇ switched electrode in order to improve the sheet rest, and to delay the combustion.
  • the object of the present invention is therefore to improve a lamp system of the type mentioned at the outset as well as a method for operating a gas discharge lamp of such a lamp system such that an improved emission characteristic and an increased service life can be achieved in a structurally simple manner.
  • a lamp system which allows a structurally simple manner improved radiation characteristics and has an increased life, is inventively ⁇ created by the fact that the filling gas consisting of a noble gas or noble gas mixture is added a halogen compound and the electronic ballast is out ⁇ forms, an AC Supply signal to be generated by means of which an alternating current between the electrodes.
  • the halogen compound may in principle comprise an elemental halogen, a covalent halide or a salt-like or complexed halide.
  • an operating mode the gas discharge lamp are selected in which a height ⁇ re electrode temperature up to the point of liquefaction of tungsten and a correspondingly improved emission ⁇ characteristic of the gas discharge lamp are given. It can also be provided that both electrodes are made at least predominantly from tungsten. In contrast to the prior art, it is therefore not necessary to have to provide structurally complex cooling mechanisms or specially adapted geometries of the electrodes or of the lamp envelope, nor must compromises with regard to the emission characteristic of the gas discharge lamp be accepted.
  • lamp bulbs with a very small volume and diameter can also be used without any problem, so that near-axis light beams are not scattered by the lamp envelope of the gas discharge lamp and thus can still be captured by the reflector, especially in the case of lamp systems designed as reflector lamps.
  • exit-reducing dopants such as ThO 2 , BaO or La 2 O 3 into the tungsten. In this way, manufacturing processes can be simplified and corresponding cost reductions he will aim ⁇ .
  • the latter dopants usually form precipitates on the lamp bulb as the lamp's life progresses and impair the emission characteristic of the gas discharge lamp.
  • the halo ⁇ gene compound bromine and / or a bromide in particular a liquid at room temperature and / or gaseous bromine compound, preferably HBr and / or CH 2 Br 2 comprises.
  • a liquid at room temperature and / or gaseous bromine compound preferably HBr and / or CH 2 Br 2 comprises.
  • bromine offers the advantage that tungsten-bromine compounds are stable up to about 1500 K and thus reliably decompose at the tips of the electrodes, as these have the required decomposition temperature and represent the hottest points of the gas discharge lamp.
  • tungsten-iodine compounds decompose already at considerably lower temperatures of about 500 K, while on the other hand tungsten-fluorine or tungsten-chlorine compounds decompose at higher temperatures, so that under the usual operating conditions no reliable decomposition is ensured.
  • the KaIt- filling pressure of the filling gas within the lamp envelope between ⁇ rule 5 bar and 45 bar and preferably at least 20 bar.
  • the concentration of the halogen compound is between 5 ppm and 4000 ppm, in particular between 10 ppm and 2000 ppm and preferably between 20 ppm and 800 ppm.
  • ppm refers to mass fractions per milli ⁇ on.
  • the chemical transport process can no longer be sufficiently maintained so that the deposition rate of tungsten on the lamp envelope is not sufficiently reduced.
  • concentration of 4000 ppm occur undesirable reactions between the halogen compound and the electrode material, whereby the life of the gas discharge lamp is also undesirable affected. In this case, the electrode tips can increasingly grow together, which ultimately leads to rapid uselessness of the lamp system.
  • a halogen concentration within the range according to the invention of between 5 ppm and 4000 ppm by contrast, a stable cyclic process is ensured without impairing the electrodes or the characteristic of the arc discharge.
  • the electronic ballast according to the invention is designed to provide an AC feed signal, by means of which an alternating current between the electrodes can be generated.
  • the light ⁇ system of the invention allows a very effective and permanent stabilization of the arc due to the self-repair of the electrodes - discharge.
  • both electrodes burn down evenly and considerably slower, so that the focus of the arc spatially not move even in continuous operation of the gas discharge lamp and a optima ⁇ le radiation of the lamp system is ensured throughout its lifetime.
  • the erfindungsge ⁇ compliant success has been set up in a wide variety of signal forms.
  • the supplied AC feed signal comes from the electronic ballast can therefore have play, a rectangular, triangular or sinusoidal waveform at ⁇ .
  • the AC feed signal has a frequency between 40 Hz and 1000 Hz, preferably between 60 Hz and 400 Hz. Within this frequency band, a special ⁇ DERS stable operation of the gas discharge lamp is reliably ensured with a lower arc instability.
  • the electronic ballast is designed to modulate the AC supply signal in amplitude.
  • amplitude reductions also affect the invention. bring about this and in particular lead to the prevention of bowing.
  • a Stabili ⁇ tion is achieved with regard to the local genentladung constancy of the soil thereby, the self-stanchions high optical requirements sufficient to projection or endoscope lamps.
  • the amplitude modulation representing a pulse amplitude modulation. It can be provided depending on the purpose of use depending ⁇ stan of the lamp system, that the pulse shape of a rectangular, triangular, rudsinus-, sawtooth or rectangular in shape having an exponential rise.
  • the pulse amplitude modulation has an amplitude overshoot in relation to the unmodulated AC feed signal.
  • the amplitude increase is at least 15%, in particular at least 20%, and preferably at least 40%, above an average of the unmodulated amplitude of the AC feed signal.
  • Such an amplitude increase leads to a particularly high stabilization of the arc discharge between the electrodes, which also stabilizes the coupling-in efficiency of the emitted light into a light guide.
  • the electronic ballast being designed to terminate the pulse amplitude modulation at an adjustable time interval, in particular at a distance of less than 0.5 ms, before a subsequent commutation of the AC supply signal.
  • This permits an advantageous control of surface ⁇ temperature of the electrodes, so that in this way fertil in conjunc- with the permanent change of electrode function between the positive polarity and the negative polarity and the halogen cycle process a time A ⁇ position of the flowability and thus the self-healing ⁇ ability of the electrode surfaces is made possible.
  • the proportion of the unmodulated AC feed signal is at least 50%.
  • the amplitude peaks and / or the amplitude reductions can always lead to positive amplitudes or always to negative ones Amplitudes or alternately to positive and negative amplitudes or simultaneously to positive or negative amplitudes of the unmodulated AC feed signal.
  • PHg is provided that within a half-period of the AC feed signal, the proportion of the unmodulated signal at least 50%, in particular between 50% and 80% be ⁇ carries. On the one hand, this ensures stable operation of the lamp system and, moreover, allows the lamp system to be optimally adapted to the respective application.
  • the heat ⁇ pipe through the existing pe at least substantially or entirely of xenon filling gas inside the lamp bulb of the Gasentladungslam- is advantageously reduced. Since the lamp envelope can be formed correspondingly smaller due to the present invention reduced tungsten precipitate advantageous ⁇ adhesive enough, a correspondingly small amount of xenon is be ⁇ forces, thereby further savings.
  • the gas discharge lamp a lamp Leis ⁇ tung between 5 W and 500 W, in particular between 10 W and 350 W on.
  • the lamp system is preferably designed as a double-ended short arc lamp and / or Re ⁇ flektorlampe.
  • the lamp system can be advantageously used as a point light source with low space requirements. Due to the darkness prevented by means of the halogen cycle, the lamp bulb of the gas discharge lamp can be made very compact. The small volume also allows a higher operating pressure, which in turn reduces the evaporation rate of the electrode material and ensures a further extension of the life.
  • a configuration as a reflector lamp has the advantage that the light generated by the gas discharge lamp can be focused in egg ⁇ ner desired manner and selectively radiated. Due to the present invention enabled spatial constancy of the arc discharge the emitted light can thereby reliably and continuously focused and examples play, with the use of parabolic reflectors at least substantially parallel with high intensity note ⁇ irradiated.
  • a light guide is provided, in which a radiated light of the gas discharge lamp can be coupled einbar. Due to the inventively increased Bogensta- stability and coupling efficiency of the emitted light in the light guide, the lamp system is thus ideal for use in projectors, endoscopes or imaging systems. Particularly in the case of endoscopes or image acquisition systems, it is possible to It can be ensured that the electronic ballast is additionally designed to synchronize the AC supply signal or the pulse amplitude modulation with a sampling rate of the respective image acquisition in order to avoid flicker phenomena. A corresponding synchronization can also be advantageously provided when the lighting system is designed as a projector, in which case, for example, a synchronization between the AC feed signal and an image display or a color wheel is made.
  • the distance between the first and the second electrode system is at most 3.0 mm and preferably at most 2.5 mm.
  • the gas discharge lamp is designed as a so-called short-arc lamp and thus can be used advantageously as a point light source.
  • a further aspect of the invention relates to a method for operating a gas discharge lamp by means of an electronic ballast, in which at least the steps a) providing the gas discharge lamp, which comprises a lamp envelope, with a standing under a cold filling and consisting of a noble gas or noble gas mixture filling gas is filled and within which two tungsten electrodes are arranged at a predetermined distance from each other, wherein the filling gas ei ⁇ ne halogen compound is added, b) providing the electronic ballast, which is designed to provide an AC feed signal, c) coupling the electro ⁇ African ballast connected to the electrodes, d) provide readiness of the supply signal by means of the electronic switching device and before ⁇ e) generating an arc discharge be- see the electrodesubenge ⁇ leads by means of the feed signal.
  • the invention relates to a lighting system with a light guide and a lamp system according to one of the preceding exemplary embodiments Ie, wherein a light emitted by the gas discharge lamp of the Lam ⁇ pensystems light into the light guide is einkop- Pelbar.
  • the illumination system can be designed, for example, as a projector or as part of a projector, an endoscope or an image acquisition system, so that the various advantages of the lamp system mentioned above - in particular the increased spatial constancy and reduced flickering of the arc discharge, the considerably extended service life, the possibility To use the lamp system as a point light source, as well as the improved intensity and coupling efficiency of the ab ⁇ radiated light - lead to a significant improvement of the respective lighting system.
  • the electronic ballast is designed to include the AC supply signal or the pulse amplitude modulation Synchronize a sampling rate of the respective image capture to avoid flare.
  • a corresponding synchronization can also be advantageously provided when the lighting system is designed as a projector, in which case, for example, a synchronization between the AC feed signal and an image representation or a color wheel is performed.
  • Fig. 1 is a schematic representation of a lamp system according to an embodiment
  • FIG. 2 is a schematic diagram of different AC supply signals provided by an electronic ballast of the lamp system shown in FIG. 1.
  • FIG. 2 is a schematic diagram of different AC supply signals provided by an electronic ballast of the lamp system shown in FIG. 1.
  • Fig. 1 shows a schematic representation of a lamp ⁇ system according to an embodiment.
  • the lamp system in this case has a gas discharge lamp 10, which comprises a lamp bulb 12, which is filled with a standing under a cold inflation pressure filling gas and within which two, consisting of doping-free tungsten E- electrodes 14a, 14b are arranged at a predetermined distance from each other.
  • the lamp system further for generating a Bogenent- comprises an electrophotographic ⁇ African gear 16 which is coupled to the electrodes 14a, 14b and is adapted to an AC supply signal 18 (s. Fig. 2) charge between provide to the electrodes 14a, 14b.
  • the distance between the electrodes 14a, 14b is less than 3.0 mm, so that the gas discharge lamp 10 is designed as a short arc lamp.
  • the filling gas consists of xenon and is under a cold filling pressure of 40 bar. In principle, however, alternatively or additionally, other filling gases such as neon, krypton or argon or corresponding gas mixtures may be provided. Likewise, deviating cold filling pressures between about 5 bar and 45 bar or more may be provided. In order to ensure an improved Abstrahlcharak ⁇ teristics and an increased life of the lamp system in a structurally simple and cost-effective manner, a halogen compound is added to the filling gas.
  • the halogen compound comprises in the present embodiment, bromine, which can be generally added as ele ⁇ mentares Br 2, as a bromine salt, or as Bromkohlenement ⁇ material connection.
  • the bromine is present in the embodiment shown in a mass concentration of 800 ppm.
  • the gas discharge lamp 10 shown was operated by means of the electronic ballast 16 for a period of 160 hours with one of the explained in more detail in Fig. 2 AC feed signals 18a-c and shows due to the chemical transport process, which is made possible by the added bromine, no blackening of Lamp bulb 12.
  • the lamp system shown is suitable for a wide variety of lighting systems, such as wise projectors or endoscopes and may also include a reflector.
  • Fig. 2 shows a schematic diagram with three different union under ⁇ electronic advantages shown by in Fig. 1 the switching device 16 provided AC feed signals 18a-c, by means of which in each case an alternating current between the E lektroden 14a, is generated 14b, so that which can be operated flexibly 10 depending on their respective purpose of use of the lamp system Gasentla pressure discharge lamp.
  • the time t is plotted on the abscissa of the diagram and the amplitude A of the supply signals 18 is plotted on the ordinate.
  • the AC feed signals 18a-c each have an integral power of 50 W and have frequencies between 40 Hz and 1000 Hz, whereby a stable and long-lasting operation of the gas discharge lamp 10 is ensured with high arc stability and low Flickerne mod.
  • the first AC feed signal 18a represents an unmodulated rectangular signal, which thus periodically changes between two states and thereby generates an alternating current between the two electrodes 14a, 14b.
  • the second AC feed signal 18b represents a pulsamplitudenmodu- profiled feed signal and has a modulated, the amplitude of the unmodulated AC feed signal 18b-enhancing pulse in each Halbpe ⁇ Riode on.
  • the Amp ⁇ litudenüberhöhung of the pulse is at least about 20% egg ⁇ nem average of the unmodulated amplitude of the AC feed signal 18b.
  • the pulse amplitude modulation of the AC feed signal 18b has a duty cycle of about 35% and is provided by the electronic ballast 16 each at a time interval of less than 0.5 ms each subsequent commutation of the AC feed signal 18b terminated.
  • the pulse amplitude modulation comprises an amplitude reduction of the unmodulated AC feed signal 18b, that the pulse amplitude modulation is not performed in each half-period, that individual half periods of the AC feed signal 18b are not modulated, or that a deviating time interval before the respectively following commutation is selected in order to ensure an optimal temperature profile at the surfaces of the electrodes 14a, 14b.
  • the third AC feed signal 18c also constitutes a pulse-amplitude modulated supply signal and thus has like the second AC feed signal 18b in each ⁇ the half period a modulated, the amplitude of the unmodulated AC feed signal 18c-enhancing pulse to.
  • the amplitude increase of the pulse is in this case at least 40% above an average of the unmodulated Amplitu ⁇ de of the AC feed signal 18c.
  • the pulse amplitude modulation of the AC supply signal 18c has a duty cycle of about 50% and is in turn terminated by the electronic ballast 16 at a time interval of less than 0.5 ms before each subsequent commutation.

Abstract

L'invention concerne un système de lampe comportant une lampe à décharge (10) pourvue d'une ampoule (12) qui est remplie d'un gaz composé d'un gaz rare ou d'un mélange de gaz rares sous pression de remplissage à froid et à l'intérieur de laquelle deux électrodes (14a,14b) de tungstène sont montées avec un espacement mutuel prédéfini. Ce système comporte également un ballast électronique (16) couplé aux électrodes (14a,14b) et conçu pour générer un signal d'alimentation en courant alternatif destiné à créer une décharge en arc entre les électrodes (14a,14b), un composé halogène étant ajouté au gaz de remplissage. L'invention porte également sur un procédé de fonctionnement d'une lampe à décharge (10) au moyen d'un ballast électronique (16).
PCT/EP2008/053255 2008-03-19 2008-03-19 Système de lampe comportant une lampe à décharge et procédé de fonctionnement d'une lampe à décharge WO2009115117A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2008/053255 WO2009115117A1 (fr) 2008-03-19 2008-03-19 Système de lampe comportant une lampe à décharge et procédé de fonctionnement d'une lampe à décharge
TW098108519A TW200945951A (en) 2008-03-19 2009-03-17 Lamp system with a gas-discharge lamp and method for operating a gas-discharge lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/053255 WO2009115117A1 (fr) 2008-03-19 2008-03-19 Système de lampe comportant une lampe à décharge et procédé de fonctionnement d'une lampe à décharge

Publications (1)

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WO2009115117A1 true WO2009115117A1 (fr) 2009-09-24

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WO (1) WO2009115117A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920675A1 (de) * 1988-06-23 1990-01-04 Toshiba Lighting & Technology Kurzbogen-entladungslampe
US5608294A (en) * 1994-06-22 1997-03-04 U.S. Philips Corporation High pressure lamp operating circuit with suppression of lamp flicker
US20030076041A1 (en) * 2001-09-19 2003-04-24 Hisashi Honda High pressure discharge lamp and luminaire
US20040036393A1 (en) * 1999-02-01 2004-02-26 Eastlund Bernard J. High intensity discharge lamp with single crystal sapphire envelope
DE10354868A1 (de) * 2002-11-22 2004-06-17 Koito Mfg. Co., Ltd. Quecksilber-freie Bogenentladungsröhre für eine Entladungslampeneinheit
WO2005109968A1 (fr) * 2004-05-10 2005-11-17 Philips Intellectual Property & Standards Gmbh Procede et circuit pour le fonctionnement d'une lampe a decharge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920675A1 (de) * 1988-06-23 1990-01-04 Toshiba Lighting & Technology Kurzbogen-entladungslampe
US5608294A (en) * 1994-06-22 1997-03-04 U.S. Philips Corporation High pressure lamp operating circuit with suppression of lamp flicker
US20040036393A1 (en) * 1999-02-01 2004-02-26 Eastlund Bernard J. High intensity discharge lamp with single crystal sapphire envelope
US20030076041A1 (en) * 2001-09-19 2003-04-24 Hisashi Honda High pressure discharge lamp and luminaire
DE10354868A1 (de) * 2002-11-22 2004-06-17 Koito Mfg. Co., Ltd. Quecksilber-freie Bogenentladungsröhre für eine Entladungslampeneinheit
WO2005109968A1 (fr) * 2004-05-10 2005-11-17 Philips Intellectual Property & Standards Gmbh Procede et circuit pour le fonctionnement d'une lampe a decharge

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