WO2009115117A1 - Lamp system comprising a gas discharge lamp and method for operating a gas discharge lamp - Google Patents

Lamp system comprising a gas discharge lamp and method for operating a gas discharge lamp 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
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WO
WIPO (PCT)
Prior art keywords
lamp
characterized
lamp system
system according
gas
Prior art date
Application number
PCT/EP2008/053255
Other languages
German (de)
French (fr)
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/en
Publication of WO2009115117A1 publication Critical patent/WO2009115117A1/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas- or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/12Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/16Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas- or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/24Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/26Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas- or vapour-discharge lamps
    • H01J61/84Lamps with discharge constricted by high pressure
    • H01J61/86Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/26Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28Circuit 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
    • H05B41/288Circuit 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
    • H05B41/2885Static converters especially adapted therefor; Control thereof

Abstract

The invention relates to a lamp system comprising a gas discharge lamp (10) that comprises a lamp bulb (12) that is filled with a filling gas consisting of an inert gas or an inert gas mixture at a cold filling pressure and within which two Wolfram electrodes (14a, 14b) are arranged at a predetermined distance in relation to each other. Said system also comprises an electronic ballast (16) which is coupled to electrodes (14a, 14b) and is designed to provide an AC feed signal to generate an arc discharge between the electrodes (14a, 14b). A halogen compound is added to the filling gas. The invention also relates to a method for operating a gas discharge lamp (10) by means of an electronic ballast (16).

Description

Lamp system comprising a gas discharge lamp and method of operating a gas discharge lamp

technical field

The invention relates to a lamp system of the type indicated in the preamble of claim 1 and a method for operating a gas discharge lamp via an electronic ballast.

State of the art

Such a lamp system is known from the prior art and includes a gas discharge lamp having a lamp bulb which is filled with a standing under a cold inflation pressure and consisting of a noble gas or noble gas mixture filling gas and within which two tungsten electrodes are disposed at a predetermined distance from each other , Further, the lamp system includes an electronic ballast which is coupled to the electrodes of the gas discharge lamp and is set from ¬, an AC feed signal for generating an arc discharge between the electrodes to provide. Due to the thermal stress by the heat generated during operation between both electrodes arc discharge tungsten evaporated from these and precipitates on the inner wall of the lamp envelope. This leads to undesirable blackening of the lamp bulb and a concomitant loss of light output and a significant shortening of the life of the lamp system.

To counteract this effect, various structural measures are known. For example, the Elektrodenspit- can zentemperatur lowered by lowering work function doping, and the evaporation of the tungsten can be reduced accordingly. However, the doping is also reflected in the bulb so that large-volume bulb must be chosen to provide a higher surface for the precipitation and to ensure an acceptable lifetime of the gas discharge lamp. However, a larger lamp bulb volume and a larger diameter is detrimental when using smaller reflectors, as paraxial rays may be scattered by the lamp bulb. Because often as doping material USAGE ¬ finished ThO 2 also is radioactive, the gas-discharge lamp ¬ must be disposed comparatively expensive. However, when a DC feed signal ¬ be driven gas discharge lamp, at least the switched as a cathode electrode, requires a minimum temperature to the Ent ¬ are undesirable to prevent spot-like Bogeneinschnürungen on the edges of the electrode. This impair Strengthens the arc stability of the arc and leads to very disturbing flickering due to the jumping of the approach point of the arc. In towards ¬ from burning due to the increased temperature, the connected as Ka ¬ Thode electrode during the operation of essential lent more sharply than the switched as anode Elect ¬ rode, whereby the one hand, moves the position of the arc and on the other hand, the emission of the gas discharge lamp continuously deteriorated. In this way, the service life of the lamp system is shortened accordingly. The thermal stress of connected as the anode electrode can be lowered by cooling coils see alternatively by choosing a larger diameter or by the pre-. 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.

In summary, however, all these measures increase the design complexity of the lamp system significantly without extending its life to the desired extent in return and without to ensure constant over the life of possible radiation.

Summary of the Invention

Object of the present invention is therefore to improve a lamp system of the aforementioned type and a method for operating a gas discharge lamp of such a lamp system so that an improved radiation pattern and an increased service life are achieved in a structurally simple manner.

The object is inventively achieved by a lamp system having the features of claim 1 and by a method according to claim 17 for operating a gas discharge lamp by means of an electronic pre-switching device. Advantageous developments with convenient and non-trivial further developments of the invention are specified in the subclaims, advantageous embodiments of the lamp system can be regarded as advantageous embodiments of the method and vice versa.

A lamp system which enables a structurally simple manner an improved emission as well as an increased service life has is, according to the invention as ¬ by provided that the group consisting of a noble gas or noble gas mixture filling gas is a halogen compound is added, and the electronic ballast is formed ¬, an AC provide feed signal by means of which an alternating current between the electrodes can be generated. The halogen compound may, in principle, comprise an elementary halogen, a covalent halide or a salt-like or complexed halide. This makes it possible during operation of the gas discharge lamp, an advantageous formation of a chemical transport process wherein from one electrode from ¬ steaming tungsten in the cooler portion of the lamp envelope with the gaseous under the prevailing operating temperatures usually halogen compound into a gaseous tungsten halide compound or . in the simultaneous presence of oxygen to a Wolframoxohaloge- reacts nidbildung. The resulting compound is Wolframhalogenid- occurring due to the convection within the lamp envelope transported back to the electrode advantage and decomposes at this due to the high electrode temperature again to solid tungsten and the gaseous halogen compound. Thus, a precipitate of solid tungsten on the bulb and the darkness associated reliably be prevented so that a significantly increased service life of the gas- ¬ discharge lamp results. In addition, a mode of operation of the gas discharge lamp can be selected, wherein a height ¬ re electrode temperature are given up to the softening point of the tungsten and a correspondingly improved ¬ radiating characteristic of the gas discharge lamp. It can also be envisaged that the two electrodes are at least mainly made of tungsten. Unlike the prior art, it is therefore not necessary, constructive having to provide expensive cooling mechanisms or specially Toggle matched geometries of the electrodes or the bulb, even compromising the emission of the gas discharge lamp must be accepted. Moreover, lamp bulb with a very small volume and diameter of paraxial light rays can easily be used, thereby in particular in the reflector lamps formed lamp systems not scattered by the lamp bulb of the gas discharge lamp and thus can still be captured by the reflector. Furthermore, it is not necessary austrittsar- beitssenkende dopants such as ThO 2, La 2 O 3 BaO or to incorporate into the tungsten. In this way, manufacturing processes can be simplified and corresponding cost reductions he will aim ¬. The latter dopants also form usually progresses lamp life rain on the bulb and reduce the emission of the gas discharge lamp. Since further work function lowering Füllzusätze such as cesium, sodium and the like are intended neither necessary nor using the configuration of the gas discharge lamp according to the invention, for example, xenon can be used as al- leiniges filling gas, which color ¬ reproduction indices can be achieved by more than 92 problems. The addition according to the invention a halogen compound dissolves so-with by departure from conventional technologies in a simple and inexpensive manner an unsolved need which in the present mass products in spite of the too ¬ before mentioned, various efforts could not or only satisfied in much more complex ways ¬ te ,

It has proved advantageous that the Halo ¬ gene linkage bromine and / or a bromide, in particular bond a liquid at room temperature and / or gaseous Bromver-, preferably HBr and / or CH 2 Br 2 comprises. Whether ¬ well principle, other halogens such as fluorine, chlorine or iodine may be used, the use of bromine provides the advantage that tungsten-bromine compounds are stable up to approximately 1500 K and therefore decompose reliably at the tips of the electrodes, as these have the required decomposition temperature and represent the hottest places of the gas discharge lamp. In contrast, on the one hand tungsten-iodine compounds decompose already at considerably lower temperatures of about 500 K, tungsten, fluorine or tungsten chloro- currency rend the other hand, compounds at higher temperatures decompose, so that under normal operating conditions, no reliable decomposition is ensured.

It has proved advantageous that the cold- filling pressure of the filling gas inside the lamp bulb Zvi ¬ rule 5 bar and 45 bar is and preferably at least 20 bar. By such a cold fill pressure correspondingly high operating pressures are achieved which additionally reduces the Ab ¬ vapor rate of the tungsten. This results in a further advantageous extension of the life of the lamp system. This also makes significantly increased efficiencies, for example, more than 20 lm / W can be achieved in contrast to the prior art. Furthermore, current density and luminance of the gas discharge lamp of the lamp system over a filled with a low cold fill pressure gas discharge lamp can be significantly increased. The gas discharge lamp of the lamp system can thus easily or as a high pressure ¬, be designed as a high-pressure gas discharge lamp.

Furthermore, it has proven advantageous that the concentration of the halogen compound is between 5 ppm and 4000 ppm, especially between 10 ppm and 2000 ppm and preferably between 20 ppm and 800 ppm. The term "ppm" designates mass fractions per ml ¬ on. Below 5 ppm, the chemical Transportpro- can not be maintained sufficiently process so that the deposition rate of the tungsten to the lamp vessel will not be sufficiently reduced. Above a concentration of 4000 ppm undesirable reactions between the halogen compound and the electrode material on the other hand occur, whereby the life of the gas discharge lamp is also undesirable impaired. Here, the electrode tips can thereby increasingly growing together, which ultimately leads to rapid uselessness of the lamp system. In a halo- gen-concentration within the inventive range between 5 ppm and 4000 ppm, however, a stable cycle without impairing the electrodes or the characteristic of the arc discharge is ensured.

In addition, the electronic ballast formed in accordance with of invention to provide an AC feed signal, by means of which an alternating current between the electrodes can be generated. In contrast to the prior art, in which a lighting system with a halogen-free gas discharge lamp with AC operation would be unusable within a few hours due to the accelerated blackening of the lamp envelope, enables the inventive light ¬ system due to the self-repair of the electrodes a very effective and lasting stabilization of the arc - discharge. In addition, 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 ¬ Permitted success it is set in a wide range nalformen Sig-. The supplied AC feed signal comes from the electronic ballast can therefore have play, a rectangular, triangular or sinusoidal waveform at ¬. It can, however, always be provided different waveforms.

It has also been found to be advantageous that the AC feed signal has a frequency between 40 Hz and 1000 Hz, preferably, comprises 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.

In a further advantageous embodiment of the invention it is provided that the electronic Vorschaltge- formed advises to modulate the AC feed signal in amplitude. The causes are not fully understood at present, as to bring about the ER invention success next Amplitudenüberhöhun ¬ gen and amplitude losses and run genunruhe particular to avoid soil. Advantageously 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.

A further stabilization of the arc discharge is obtained by the amplitude modulation is a pulse amplitude modulation. It can be provided depending on the purpose of use depending ¬ weiligen of the lamp system, that the pulse shape of a rectangular, triangular, halbsinus-, sawtooth or rectangular in shape having an exponential rise.

In a further advantageous embodiment of the invention it is provided that the pulse amplitude modulation with respect to the unmodulated AC feed signal comprises an amplitude denüberhöhung. This allows for selective temperature control at the starting points of the arc, whereby the surface geometry of the electrodes in combination with the halogen cycle process is such impressive ¬ flussbar that the geometry of the Elektrodenoberflä- chen, the geometry of the arc discharge and the reaction of the arc selectively influenced and very can be effectively stabilized ¬ lisiert. This will provide in addition to the improved local constancy of the arc and a further extension of the service life of the lamp system ensured. It should be emphasized that a feed signal can be understood by the unmodulated AC feed signal, of course, which is already produced itself by a Amplitu ¬ denmodulation.

It has also been found to be advantageous that the amplitude overshoot at least 15%, especially at least 20% and preferably at least 40% to an average value of the unmodulated amplitude of the AC feed signal is located. Such an amplitude overshoot leads to a particularly high stabilization of the arc discharge between the electrodes, whereby the coupling efficiency of the emitted light is stabilized in a light guide.

Further advantages are obtained by the electronic ballast is formed, the Pulsamplitudenmodula- tion in an adjustable time interval, in particular at a distance of less than 0.5 ms to terminate prior to a subsequent commutation of the AC feed 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.

In a further advantageous embodiment of the invention provides that within a period of the pulse amplitude modulation of the unmodulated portion of the AC supply signal is at least 50%. This makes it possible to characterize the pulse amplitude modulation by a sequence of amplitude peaks, a sequence of amplitude reductions as well as a series of amplitude peaks and amplitude reductions which alternate each other. Here, different embodiments have proven to be successful: the amplitude denüberhöhungen and / or amplitude reductions can be made always positive amplitudes or always negative amplitudes or alternately positive and negative amplitudes or simultaneously positive or negative amplitude of the unmodulated AC feed signal.

In a further advantageous embodiment of the inventions fertil is provided that carries ¬ within a half period of the AC feed signal, the proportion of the unmodulated signal at least 50%, especially between 50% and 80% be. On the one hand provides a stable operation of the lamp system and permits, moreover, the LAM pen system optimally adapted to the respective application to adapt.

In this case, a sunlight similar Abstrahlcharakteris ¬ tik of the lamp system is accomplished with a color rendering index of about 92, in another embodiment in that the filling gas is at least 90%, especially at least 95% and preferably at least 99%, be ¬ is of xenon. Furthermore, 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.

Advantageously, the gas discharge lamp a lamp Leis ¬ tung between 5 W and 500 W, in particular between 10 W and 350 W on. A particularly flexible arrival is given fittability of the lamp system to different applications. In a further advantageous embodiment of the invention it is provided that the lamp system is preferably designed as a double-ended short arc lamp and / or Re ¬ flektorlampe. By a configuration as a short arc lamp, the lamp system may be advantageously used as a point light source with a low space requirement. Due to the prevented by means of the halogen cycle process blackening of the lamp bulb of the gas discharge lamp can thereby be made very compact. The small volume also enables a higher operating pressure, which in turn reduces the evaporation rate of the electrode material and ensures a further life extension. Alternatively or additionally, provides 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 abge ¬ irradiated.

In a further embodiment, it has proven to be advantageous that a light guide is provided, in which an emitted light of the gas discharge lamp is coupling-bar. Due to the present invention increased Bogensta- stability and coupling efficiency of the radiated light into the light guide, the lamp system is therefore ideal for use in projectors, endoscopes or imaging systems. Particularly in the case of endoscopes or imaging systems can thereby be advanta- way provided that the electronic Vorschaltge- advises is additionally adapted to synchronize the AC feed signal or pulse amplitude modulation with a sampling rate of the respective image sensing in order to avoid phenomena Flimmerer-. A corresponding synchronization may be also advantageously provided, when the illumination system is formed as a projector, wherein for example, a synchronization between the AC supply signal and an image representation or a color wheel is made in this case.

Further advantages are obtained by setting the distance between the first and the second electrode system than 3,0 mm and preferably at most 2.5 mm. With at ¬ whose words, it is provided that the gas discharge lamp is designed as a so-called short-arc lamp and thus can be advantageously used as a point light source.

Another aspect of the invention relates to a method for operating a gas discharge lamp by means of an e- lektronischen ballast in which at least the steps of a) providing the gas discharge lamp comprising a lamp vessel which existing with a standing under a cold inflation pressure and a noble gas or noble gas mixture filling gas is filled and within which two tungsten electrodes are disposed at a predetermined distance from one another, 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 electrostatic ¬ African ballast 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 electrodes by means of feed signal Runaway ¬ leads. In this way, an improved emission and a he ¬ creased service life of the lamp system ensures a simple design because during operation of the gas discharge lamp a beneficial ¬-like formation of a chemical transport and county ¬ process is achieved. The presented in connection with which he ¬ inventive lamp system preferred embodiments and further developments as well as their advan- Ie apply mutatis mutandis for the novel procedural ¬ ren.

In another aspect, the invention relates to an illumination system comprising 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 may be designed for example as a projector or as part of a projector, an endoscope, or an image acquisition system, so that the various above-mentioned advantages of the lamp system - in particular, the increased spatial consistency and reduced Flickerneigung of the arc which significantly extended life, the possibility of to use the lamp system as a point light source, and the improved intensity and coupling efficiency of the ex ¬ reflected light - lead to a substantial improvement of the respective lighting system. thereby, in the case of trained as an endoscope or imaging system illumination systems may be advantageously provided that the electronic ballast is designed to synchronize the AC feed signal or pulse amplitude modulation with a sampling rate of the respective image sensing in order to avoid flicker. A corresponding synchronization may be also advantageously provided, when the illumination system is formed as a projection gate, wherein for example, a synchronization between the AC supply signal and an image representation or a color wheel is made in this case.

Brief Description of Drawings

In the following the invention reference to an exemplary embodiment and will be explained with reference to drawings, which are provided in sliding ¬ che or functionally identical elements with identical reference numbers Be ¬ closer. They show:

Fig. 1 is a schematic diagram of a lamp system according to an embodiment; and

Fig. 2 AC feed signals provided a schematic diagram with different electronic ballast of the lamp by a system shown in FIG. 1.

Preferred embodiments of the invention

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 includes a lamp envelope 12 which is filled with a standing under a cold inflation pressure inflation gas and within which two of dopant free tungsten existing E- lektroden 14a, are arranged at a predetermined distance 14b. For operating the gas discharge ¬ lamp 10, 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 to provide the electrodes 14a 14b. The distance between the electrodes 14a, 14b is we ¬ niger than 3.0 mm, so that the gas discharge lamp 10 is formed as a short arc lamp. The filling gas consists of xenon and is under a cold inflation pressure of 40 bar. In principle, however, other filling gases also as neon, krypton or argon or corresponding gas mixtures can be provided alternatively or additionally. Likewise, different cold filling pressures between about 5 bar and can be provided 45 bar or more. In order to ensure a structurally simple and inexpensive manner an improved Abstrahlcharak ¬ teristik as well as an increased service life of the lamp system, is added to the filling gas is a halogen compound. 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 Bromkohlenwasser ¬ material connection. The bromine is present on of 800 ppm in a Massenkonzentrati- in the illustrated embodiment. The gas discharge lamp 10 shown operated by the electronic ballast 16 for a period of 160 hours with a closer illustrated in Fig. 2 AC feed signals 18a-c and displays a result of the chemical transport process, which is made possible by the added bromine, no blackening of the lamp bulb 12. The lamp system shown is suitable for various lighting systems such as projectors or beispiels- 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. On the abscissa of the diagram is t, and the amplitude A of the feed signals 18 plotted on the ordinate the time. 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 is ensured at high arc stability and low Flickerneigung 10th

The first AC feed signal 18a is an unmodulated square wave signal, which thus changes periodically between two states, and thereby an alternating current between the two electrodes 14a, 14b produces. 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 supply signal 18b has a duty cycle of about 35% and is terminated by the electronic ballast 16 in each case in a time interval of less than 0.5 ms before each successive commutation of the AC feed signal 18b. In this case, alternatively, of course, also be provided that 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 cycle that individual half periods of the AC feed signal 18b are not modulated, or a deviating time interval before each of the subsequent commutation is selected to an optimum temperature curve of the surfaces of the electrodes 14a, 14b ensure. 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 of the overshoot pulse is in this case at least 40% to an average value of the unmodulated Amplitu ¬ de of the AC feed signal 18c. The pulse amplitude modulation of the AC feed signal 18c has a duty cycle of et- wa 50%, and in turn the switching device from the electronic forward 16 in a time interval of less than 0.5 ms before each subsequent commutation terminated.

Claims

claims
1. Lamp system with:
- a gas discharge lamp (10) comprising a Lam ¬ penkolben (12) which is filled with a standing under a cold inflation pressure and consisting of a noble gas or noble gas mixture filling gas and within which two tungsten electrodes (14a, 14b) at a predetermined distance are arranged to each other; and
- an electronic ballast (16) connected to the electrodes (14a, 14b) is coupled and is adapted to a feed signal for generating an arc discharge between the electrodes (14a, 14b) provide, characterized in that the filling gas is a halogen compound is added, and the electronic ballast (16) is designed to provide an AC feed signal (18a-c), by means of which an alternating current between the electrodes (14a, 14b) can be generated.
2. The lamp system according to claim 1, characterized in that the halogen compound is 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.
3. The lamp system of claim 1 or 2, characterized in that the cold filling pressure of the filling gas inside the lamp bulb (12) is between 5 bar and 45 bar and most preferably ¬ at least 20 bar.
4. The lamp system according to one of claims 1 to 3, characterized in that the concentration of the halogen compound is between 5 ppm and 4000 ppm, especially between 10 ppm and 2000 ppm and preferably between 20 ppm and 800 ppm.
5. The lamp system according to one of claims 1 to 4, characterized in that the AC feed signal (18a-c) has a frequency Zvi ¬ rule 40 Hz and 1000 Hz, preferably between 60 Hz and 400 Hz.
6. The lamp system of claim 1, characterized in that the electronic ballast (16) is ausgebil ¬ det, the AC feed signal (18a-c) in the amplitude (A) to modulate.
7. The lamp system according to claim 6, characterized in that the amplitude modulation is an Pulsamplitudenmo ¬ dulation.
8. The lamp system according to claim 7, characterized in that the pulse amplitude modulation over the unmo- dulierten AC feed signal (18a-c) having an amplitude ¬ superelevation.
9. The lamp system of claim 8, characterized in that the amplitude of elevation is at least 15%, in particular ¬ sondere at least 20% and preferably at least 40% to an average value of the unmodulated amplitude (A) of the AC feed signal (18b, 18c).
10. The lamp system according to one of claims 7 to 9, characterized in that the electronic ballast (16) is ausgebil ¬ det, the pulse amplitude modulation in an adjustable time interval, in particular at a distance of less than 0.5 ms, prior to a subsequent commutation of the AC feed signal (18b, 18c) to be terminated ¬.
11. The lamp system according to one of claims 7 to 10, characterized in that within a half period of the AC feed signal, the proportion of the unmodulated signal at least 50%, especially between 50% and 80%.
12. The lamp system according to one of claims 1 to 11, characterized in that the filling gas consists of at least 90%, especially at least 95% and preferably at least 99% of xenon.
13. The lamp system according to one of claims 1 to 12, characterized in that the gas discharge lamp (10) has a lamp power is between 5 W and 500 W, in particular between 10 W and 350 W has.
14. The lamp system according to one of claims 1 to 13, characterized in that it is trained det as a preferably double-ended short arc lamp and / or as a reflector lamp.
15. The lamp system according to one of claims 1 to 14, characterized in that a light conductor is provided, one in which a light emitted of the gas discharge lamp (10) can be coupled.
16. The lamp system according to one of claims 1 to 15, characterized in that the distance between the electrodes is at most 3.0 mm and preferably at most 2.5 mm.
17. A method for operating a gas discharge lamp (10) by means of an electronic ballast (16), comprising the steps of: a. Providing the gas discharge lamp (10), wel ¬ che comprises a lamp bulb (12) which is filled with a standing under a cold inflation pressure and consisting of a noble gas or noble gas mixture filling gas and within which two tungsten electrodes (14a, 14b) at a predetermined distance are arranged to each other, wherein the filling gas is a halogen compound is added; b. Providing the electronic Vorschaltge- Raets (16) is formed, an AC supply signal to provide (18a-c); c. Coupling the electronic ballast (16) with the electrodes (14a, 14b); d. Providing an AC feed signal by means of the electronic ballast (16); and e. Generating an arc discharge between the E lektroden (14a, 14b) by means of the AC feed signal.
18. An illumination system wherein a of the gas discharge lamp (10) of the Lam ¬ pensystems light emitted with a light pipe and a lamp system according to one of claims 1 to 16, in the optical waveguide can be coupled.
PCT/EP2008/053255 2008-03-19 2008-03-19 Lamp system comprising a gas discharge lamp and method for operating a gas discharge lamp WO2009115117A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/053255 WO2009115117A1 (en) 2008-03-19 2008-03-19 Lamp system comprising a gas discharge lamp and method for operating a gas discharge lamp

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP2008/053255 WO2009115117A1 (en) 2008-03-19 2008-03-19 Lamp system comprising a gas discharge lamp and method for operating a gas discharge lamp
TW098108519A TW200945951A (en) 2008-03-19 2009-03-17 Lamp system with a gas-discharge lamp and method for operating a gas-discharge lamp

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WO2009115117A1 true WO2009115117A1 (en) 2009-09-24

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PCT/EP2008/053255 WO2009115117A1 (en) 2008-03-19 2008-03-19 Lamp system comprising a gas discharge lamp and method for operating a gas discharge lamp

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WO (1) WO2009115117A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920675A1 (en) * 1988-06-23 1990-01-04 Toshiba Lighting & Technology Short-arc discharge lamp
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 (en) * 2002-11-22 2004-06-17 Koito Mfg. Co., Ltd. Non-mercurial arc tube for a gas discharge lamp used in a motor vehicle's lighting system has an encased glass bulb with pinch seals and opposing electrodes
WO2005109968A1 (en) * 2004-05-10 2005-11-17 Philips Intellectual Property & Standards Gmbh Method and circuit arrangement for the operation of a discharge lamp

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920675A1 (en) * 1988-06-23 1990-01-04 Toshiba Lighting & Technology Short-arc discharge lamp
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 (en) * 2002-11-22 2004-06-17 Koito Mfg. Co., Ltd. Non-mercurial arc tube for a gas discharge lamp used in a motor vehicle's lighting system has an encased glass bulb with pinch seals and opposing electrodes
WO2005109968A1 (en) * 2004-05-10 2005-11-17 Philips Intellectual Property & Standards Gmbh Method and circuit arrangement for the operation of a discharge lamp

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