EP2090142B1 - Circuit et procédé pour faire fonctionner une lampe à décharge haute pression - Google Patents

Circuit et procédé pour faire fonctionner une lampe à décharge haute pression Download PDF

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Publication number
EP2090142B1
EP2090142B1 EP06829961A EP06829961A EP2090142B1 EP 2090142 B1 EP2090142 B1 EP 2090142B1 EP 06829961 A EP06829961 A EP 06829961A EP 06829961 A EP06829961 A EP 06829961A EP 2090142 B1 EP2090142 B1 EP 2090142B1
Authority
EP
European Patent Office
Prior art keywords
amplitude
circuit arrangement
feed signal
arrangement according
frequency
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.)
Not-in-force
Application number
EP06829961A
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German (de)
English (en)
Other versions
EP2090142A1 (fr
Inventor
Martin Honsberg-Riedl
Peter Niedermeier
Burkhard Ulrich
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Osram GmbH
Original Assignee
Osram GmbH
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Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2090142A1 publication Critical patent/EP2090142A1/fr
Application granted granted Critical
Publication of EP2090142B1 publication Critical patent/EP2090142B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • 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

Definitions

  • the present invention relates to a circuit arrangement for operating a high-pressure discharge lamp with an electronic ballast, which is designed to provide an AC supply signal for the high-pressure discharge lamp, wherein the frequency of the AC supply signal is at least 1 MHz. It also relates to a method for operating a high-pressure discharge lamp with an AC supply signal, wherein the frequency of the AC supply signal is at least 1 MHz.
  • High-pressure discharge lamps as used for example as video projection lamps, usually have two similar electrodes, which are usually formed rod-shaped.
  • Such a jump in the arc approach particularly affects the use of high pressure discharge lamps in optical devices, such as projection equipment, beamers, Microscope illuminations, and may lead to uselessness in the application.
  • a material annealing ie the electrode metal tungsten from the gas circulation process is deposited with the tungsten halides on the electrodes, and a peaking on the electrodes, which stabilizes the discharge and the approach of the arc very effectively.
  • WO 03/098979 A1 From the WO 03/098979 A1 is the operation of a high-pressure discharge lamp with an unmodulated RF signal of more than 3 MHz known.
  • high-pressure discharge lamps permit successful HF operation only at frequencies which are above the acoustic resonances in the combustion chamber. These acoustic resonances lead to strong currents in the combustion chamber, which generally disturb the discharge arc in general.
  • a gas discharge lamp in which a combustion chamber has only one electrode.
  • a counter electrode is formed by a reflector outside the combustion chamber.
  • the lamp is powered by a high frequency alternating current.
  • an amplitude of the high-frequency alternating current is modulated.
  • a repetition frequency of the amplitude modulation is selected such that acoustic oscillations are excited in the lamp.
  • the present invention is therefore the object of the above-mentioned circuit arrangement or the aforementioned method in such a way that in the specified frequency range, d. H.
  • d. H the specified frequency range
  • the present invention is based on the finding that a very effective stabilization of the arc in high-frequency operation can be achieved when the AC feed signal is modulated in amplitude.
  • the causes of this are currently not fully understood, since in addition amplitude amplitudes and amplitude reductions bring about the success of the invention and to avoid flicker phenomena of discharge arcs in general, especially plasma bows in high pressure discharge lamps lead.
  • An indication of this is that a stabilizing peaking similar to that in operation with that in the mentioned US 5,608,294 presented circuit arrangement, only after a few hours adjusts. In other words, this means that the actual explanation for the solution according to the invention is not to be found in the peak formation.
  • the time constancy and spatial constancy of the discharge arc stabilization is achieved, the self meets the high optical requirements of projection lamps.
  • HF operation In contrast to LF operation, HF operation enables simple, even single-stage ballasts. This allows over the current state of the art (low-frequency operation) greatly reduced and thus significantly cheaper ballasts.
  • the amplitude modulation represents a pulse modulation.
  • a stabilization of the arc is achieved by a pulse-shaped, periodically repeated amplitude modulation of the AC feed signal outside the range of stronger acoustic resonances.
  • the pulse modulation has a repetition frequency of 100 Hz to 100 kHz, preferably from 100 Hz to 2 kHz.
  • the duty cycle of the pulse modulation is preferably between 1% and 50%, preferably between 3% and 20%. From the point of view of video projection applications, duty cycles have proved to be very advantageous in which the modulation pulses only take very short periods of time, in particular periods of time which are shorter than the image dark gap.
  • the amplitude modulation of the AC feed signal may be at a constant frequency, but may also be accompanied by a frequency change.
  • the changed frequency is in a range of - 50% to + 100%, preferably in a range of - 10% to + 10%, the frequency of the AC feed signal.
  • the pulse modulation can be characterized by an amplitude increase compared to the unmodulated AC feed signal.
  • Particularly good results with regard to the stabilization of the arc have at amplitude peaks between 20% and 1000%, preferably between 20% and 200%, of the amplitude of the unmodulated AC feed signal.
  • the pulse modulation can also be characterized by an amplitude reduction compared to the unmodulated AC feed signal.
  • the amplitude reduction is between - 5% and - 90% of the unmodulated AC supply signal.
  • the pulse modulation may be characterized by a sequence of amplitude peaks, a sequence of amplitude decreases, and a sequence of amplitude peaks and reductions in amplitude that alternate.
  • the amplitude peaks and / or the amplitude reductions can always take place to positive amplitudes or always to negative amplitudes or alternately to positive and negative amplitudes or simultaneously to positive or negative amplitudes of the unmodulated AC feed signal.
  • the sequence of an amplitude increase with an immediately following amplitude reduction or the reverse order has proved to be particularly advantageous.
  • the success of the invention has been achieved in a wide variety of pulse shapes, in particular in rectangular, triangular, semi-sinusoidal, rectangular with exponential rise or sawtooth-shaped pulse shape.
  • the electronic ballast preferably has an input connection for connecting an input voltage, an output connection for providing an AC supply signal to the high-pressure discharge lamp and a series connection comprising an inverter and a load network arranged between the input connection and the output connection.
  • the inverter is an inverter output voltage having a predetermined frequency, a predetermined Amplitude and a predetermined duty cycle to the load network provides.
  • the predefinable frequency and / or the predeterminable amplitude of the inverter output voltage is changed for amplitude modulation of the AC supply signal.
  • the load network has at least one transformer which is arranged at the input and / or the output and / or between the input and the output of the load network. This proves to be particularly useful in the case of very low or high operating voltages or in the demand for a safe electrical isolation, which is here, for example, the railway standard of 2 kV to think.
  • the load network is preferably designed so that it can be brought into resonance by changing the predeterminable frequency of the inverter output voltage, thereby generating the ignition voltage for ignition of the high-pressure discharge lamp. This eliminates the provision of a separate ignition device.
  • the high-pressure discharge lamp preferably has an operating pressure of 100 to 500 bar.
  • the Fig. 1 shows a schematic representation of the structure of a circuit arrangement according to the invention.
  • the input voltage Ue which in particular can represent the so-called intermediate circuit voltage, is supplied to a high-frequency inverter 10. Its output signal is characterized by a predeterminable amplitude, a predefinable frequency and a specifiable duty cycle. These predefinable variables can be set via an interface (not shown) on the inverter 10.
  • the output signal Ua of the inverter 10 is supplied to a load network 12. At the output of a lamp current I L is provided to the high-pressure discharge lamp 14.
  • the load network 12 forms the approximately sinusoidal lamp current I L from the output voltage Ua of the inverter 10 and simultaneously serves to limit the current.
  • the lamp current can be dependent on both the frequency and the amplitude of the output voltage of the inverter.
  • the load network 12 is also designed so that it can be brought into resonance by changing the predeterminable frequency of the output voltage Ua of the inverter, so as to generate the ignition voltage for the high-pressure discharge lamp.
  • Fig. 2 shows various embodiments of a suitable load network. It should be noted that in the embodiments according to Fig. 2a and 2d the capacitor C 2 can be designed differently: Once to contribute to the resonant network, on the other hand, only for DC separation. If at least one transformer is inserted at the input or at the output or between the input and the output of the load network 12, it is possible in particular to ensure galvanic isolation. In addition to the illustrated load networks in T-arrangement, pure series circuits of LC elements as well as circuits in ⁇ -arrangement can be used for the purposes of the present invention. As will be apparent to those skilled in the art, the objects of the present invention can also be achieved with higher order load networks.
  • Fig. 3 shows the transfer function of the lamp current I L as a function of the frequency f of the input voltage Ue for the in Fig. 2a shown load network.
  • Two operating points AP1 and AP2 are shown, with reference to FIG Fig. 8 is returned.
  • FIGS. 4 and 5 show examples of inverters 10 that are suitable for the circuit arrangement of Fig. 1 are suitable.
  • Fig. 4 shows a switch-relieved class E-converter
  • Fig. 5 a zero-voltage ZVS (Zero Voltage Switching) half-bridge. Since the inverters according to the FIGS. 4 and 5 the person skilled in the art are known, will not be discussed in detail.
  • ZVS Zero Voltage Switching
  • the driving frequency of the switching transistors, S1 in Fig. 4 or S1 and S2 in Fig. 5 frequency modulated.
  • a voltage-controlled, variable-frequency oscillator can be shared, which is usually present anyway for power or power control.
  • Fig. 6 shows the generation of the drive signals for the inverter according to Fig. 5 ,
  • a pulse signal P is added to the already existing control signal Q for operation in the adder 16.
  • This control signal is supplied to a VCO 18, which supplies it to a pulse shaper 20.
  • the pulse shaper 20 also driver circuits are usually provided.
  • the drive signals for the switches S1, S2 of the inverter 10 are provided.
  • the time profile of the lamp current I L in this variant of the control of the switch of the inverter is in Fig. 8 shown.
  • the shift of the operating point from AP1 to AP2 is associated with a change in frequency.
  • the frequency at the operating point AP2 is lower than the frequency at the operating point AP1, but the lamp current I L has a higher amplitude at the operating point AP2 than at the operating point AP1.
  • the modulation can be made by changing the amplitude of the input voltage of the inverter 10.
  • an increased lamp current I L can also be achieved, for this see the time profile of the lamp current I L of Fig. 7 in which, although the amplitude at the operating point AP1 is greater than the amplitude at the operating point AP2, the frequency remains unchanged.
  • this is particularly preferably an upstream, quickly controllable DC / DC converter.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

La présente invention concerne un circuit pour faire fonctionner une lampe à décharge haute pression (14) au moyen d'un ballast électronique conçu pour fournir un signal d'alimentation CA à la lampe à décharge haute pression (14), la fréquence de ce signal étant supérieure ou égale à 1 MHz. L'invention se caractérise en ce que ledit ballast électronique est conçu en outre pour moduler le signal d'alimentation CA en amplitude. L'invention concerne par ailleurs un procédé pour faire fonctionner une lampe à décharge haute pression (14) au moyen d'un signal d'alimentation CA, la fréquence de ce signal étant supérieure ou égale à 1 MHz et ledit signal étant modulé en amplitude.

Claims (20)

  1. Agencement de circuit pour faire fonctionner une lampe à décharge haute pression (14), ladite lampe à décharge haute pression (14) comportant deux électrodes en forme de tige dans une chambre de combustion, avec un ballast électronique, qui est conçu pour fournir un signal d'alimentation en courant alternatif pour la lampe à décharge haute pression, ledit ballast électronique étant conçu pour moduler l'amplitude du signal d'alimentation en courant alternatif,
    caractérisé par le fait
    que la fréquence du signal d'alimentation en courant alternatif est d'au moins 1 MHz, la modulation d'amplitude représentant une modulation d'impulsion avec une fréquence de répétition allant de 100 Hz à 100 kHz en conservant la fréquence du signal d'alimentation en courant alternatif ou en modifiant la fréquence du signal d'alimentation en courant alternatif dans une plage allant de -50% à +100%, dans laquelle la fréquence de répétition se situe en dehors d'une plage de résonance acoustique de la chambre de combustion.
  2. Agencement de circuit selon la revendication 1,
    caractérisé par le fait
    que la modulation d'impulsion présente une fréquence de répétition allant de 100 Hz à 2 kHz.
  3. Agencement de circuit selon l'une des revendications 1 ou 2,
    caractérisé par le fait
    que la modulation d'impulsion présente un taux d'impulsions compris entre 1% et 50%.
  4. Agencement de circuit selon l'une des revendications précédentes,
    caractérisé par le fait
    que la modulation d'impulsion s'accompagne d'une modification de fréquence du signal d'alimentation en courant alternatif allant de -10% à +10%.
  5. Agencement de circuit selon la revendication 4, caractérisé par le fait
    que la fréquence modifiée se situe dans une plage allant de -50% à +100%, de préférence dans une plage allant de -10% à +10%, de la fréquence du signal d'alimentation en courant alternatif.
  6. Agencement de circuit selon l'une des revendications précédentes,
    caractérisé par le fait
    que la modulation d'impulsion présente un surhaussement d'amplitude par rapport au signal d'alimentation en courant alternatif non modulé.
  7. Agencement de circuit selon la revendication 6, caractérisé par le fait
    que le surhaussement d'amplitude est compris entre 20% et 1000%, de préférence entre 20% et 200%, de l'amplitude du signal d'alimentation en courant alternatif non modulé.
  8. Agencement de circuit selon l'une des revendications précédentes,
    caractérisé par le fait
    que la modulation d'impulsion présente une diminution d'amplitude par rapport au signal d'alimentation en courant alternatif non modulé.
  9. Agencement de circuit selon la revendication 8, caractérisé par le fait
    que la diminution d'amplitude est comprise entre -5% et - 90% du signal d'alimentation en courant alternatif non modulé.
  10. Agencement de circuit selon l'une ou plusieurs des revendications 6 à 9,
    caractérisé par le fait
    qu'à l'intérieur d'une période de la modulation d'impulsion la fraction du signal d'alimentation en courant alternatif non modulé est d'au moins 50%.
  11. Agencement de circuit selon la revendication 10,
    caractérisé par le fait
    que la modulation d'impulsion est caractérisée par :
    - une suite de surhaussements d'amplitude;
    - une suite de diminutions d'amplitude ;
    - une suite de surhaussements d'amplitude et de diminutions d'amplitude, qui se succèdent en alternance.
  12. Agencement de circuit selon la revendication 11,
    caractérisé par le fait
    que le surhaussement d'amplitude et/ou les diminutions d'amplitude se produisent toujours à des amplitudes positives ou toujours à des amplitudes négatives ou en alternance à des amplitudes positives et négatives ou simultanément à des amplitudes positives ou négatives du signal d'alimentation en courant alternatif non modulé.
  13. Agencement de circuit selon l'une des revendications 1 à 7,
    caractérisé par le fait
    que la forme d'impulsion est rectangulaire, triangulaire, demi-sinusoïdale, rectangulaire avec une montée exponentielle ou en dents de scie.
  14. Agencement de circuit selon l'une des revendications précédentes,
    caractérisé par le fait
    que le ballast électronique comporte :
    - une connexion d'entrée pour connecter une tension d'entrée (Ue) ;
    - une connexion de sortie pour fournir le signal d'alimentation en courant alternatif à la lampe à décharge haute pression (14) ; et
    - un montage en série disposé entre la connexion d'entrée et la connexion de sortie composé d'un onduleur (10) et d'un réseau de charge (12), l'onduleur (10) fournissant au réseau de charge (12) une tension de sortie d'onduleur (Ua) avec une fréquence prédéfinissable, une amplitude prédéfinissable et un taux d'impulsions prédéfinissable.
  15. Agencement de circuit selon la revendication 14,
    caractérisé par le fait
    que l'onduleur (10) est conçu pour modifier la fréquence prédéfinissable et/ou l'amplitude prédéfinissable de la tension de sortie d'onduleur (Ua) en vue de la modulation d'amplitude du signal d'alimentation en courant alternatif.
  16. Agencement de circuit selon l'une des revendications 14 ou 15,
    caractérisé par le fait
    que le réseau de charge (12) comporte au moins un transformateur, qui est disposé à l'entrée et/ou à la sortie et/ou entre l'entrée et la sortie du réseau de charge (12).
  17. Agencement de circuit selon l'une des revendications 14 à 16,
    caractérisé par le fait
    que le réseau de charge (12) est conçu pour être mis en résonance par modification de la fréquence prédéfinissable de la tension de sortie d'onduleur (Ua) afin de produire une tension d'allumage pour la lampe à décharge haute pression (14).
  18. Agencement de circuit selon l'une des revendications 14 à 17,
    caractérisé par le fait
    que la lampe à décharge haute pression (14) présente une pression de fonctionnement de 100 à 500 bar.
  19. Procédé pour faire fonctionner une lampe à décharge haute pression (14), ladite lampe à décharge haute pression (14) comportant deux électrodes en forme de tige dans une chambre de combustion, avec un signal d'alimentation en courant alternatif, la fréquence dudit signal d'alimentation en courant alternatif étant au moins de 1 MHz,
    caractérisé par le fait
    que le signal d'alimentation en courant alternatif est modulé en amplitude, la modulation d'amplitude représentant une modulation d'impulsion avec une fréquence de répétition allant de 100 Hz à 100 kHz en conservant la fréquence du signal d'alimentation en courant alternatif ou en modifiant la fréquence du signal d'alimentation en courant alternatif dans une plage allant de -50% à +100%, dans laquelle une fréquence de répétition se situe en dehors d'une plage de résonance acoustique de la chambre de combustion.
  20. Agencement de projection pour contenus sous forme d'image avec un agencement de circuit selon l'une des revendications 1 à 18, une lampe à décharge haute pression (14), l'agencement de circuit faisant fonctionner la lampe à décharge haute pression (14) avec un procédé selon la revendication 19, et la lampe à décharge haute pression (14) comportant deux électrodes en forme de tige dans une chambre de combustion.
EP06829961A 2006-11-09 2006-11-09 Circuit et procédé pour faire fonctionner une lampe à décharge haute pression Not-in-force EP2090142B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/068269 WO2008055544A1 (fr) 2006-11-09 2006-11-09 Circuit et procédé pour faire fonctionner une lampe à décharge haute pression

Publications (2)

Publication Number Publication Date
EP2090142A1 EP2090142A1 (fr) 2009-08-19
EP2090142B1 true EP2090142B1 (fr) 2012-06-27

Family

ID=38198419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06829961A Not-in-force EP2090142B1 (fr) 2006-11-09 2006-11-09 Circuit et procédé pour faire fonctionner une lampe à décharge haute pression

Country Status (6)

Country Link
US (1) US8339057B2 (fr)
EP (1) EP2090142B1 (fr)
KR (1) KR101358173B1 (fr)
CN (1) CN101523997A (fr)
TW (1) TW200829084A (fr)
WO (1) WO2008055544A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6055170B2 (ja) * 2011-06-15 2016-12-27 セイコーエプソン株式会社 光源装置、放電灯の駆動方法およびプロジェクター
JP5768558B2 (ja) * 2011-07-25 2015-08-26 セイコーエプソン株式会社 光源装置、放電灯の駆動方法およびプロジェクター
KR102125026B1 (ko) * 2018-05-17 2020-06-19 주식회사 뉴파워 프라즈마 플라즈마 전원용 공진 네트워크 및 플라즈마 발생기용 전력공급장치

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4123187A1 (de) * 1991-07-12 1993-01-14 Tridonic Bauelemente Vorschaltgeraet zum pulsbetrieb von gasentladungslampen
TW339496B (en) 1994-06-22 1998-09-01 Philips Electronics Nv Method and circuit arrangement for operating a high-pressure discharge lamp
US5684367A (en) 1996-01-16 1997-11-04 Osram Sylvania Inc. Color control and arc stabilization for high-intensity, discharge lamps
DE19829600A1 (de) 1998-07-02 1999-09-23 Seufert Gmbh Dr Betriebsverfahren und elektronisches Vorschaltgerät für Hochdruck-Wechselspannungs-Entladungslampen
US6809483B2 (en) * 2000-07-21 2004-10-26 Osram Sylvania Inc. Method and apparatus for arc detection and protection for electronic ballasts
US6680582B1 (en) * 2000-10-06 2004-01-20 Koninklijke Philips Electronics N.V. System and method for employing pulse width modulation for reducing vertical segregation in a gas discharge lamp
US6566817B2 (en) 2001-09-24 2003-05-20 Osram Sylvania Inc. High intensity discharge lamp with only one electrode
US6737815B2 (en) * 2001-12-21 2004-05-18 Koninklijke Philips Electronics N.V. Reducing vertical segregation in a HID lamp operated at VHF frequencies using simultaneous arc straightening and color mixing
JP4186578B2 (ja) * 2002-10-09 2008-11-26 ウシオ電機株式会社 高圧放電ランプ点灯装置
DE102005028417A1 (de) 2005-06-20 2006-12-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Vorrichtung zum Bereitstellen einer sinusförmig amplitudenmodulierten Betriebsspannung, Beleuchtungssystem und Verfahren zum Erzeugen einer amplitudenmodulierten Spannung

Also Published As

Publication number Publication date
KR20090087049A (ko) 2009-08-14
KR101358173B1 (ko) 2014-02-07
US20100134032A1 (en) 2010-06-03
EP2090142A1 (fr) 2009-08-19
TW200829084A (en) 2008-07-01
CN101523997A (zh) 2009-09-02
WO2008055544A1 (fr) 2008-05-15
US8339057B2 (en) 2012-12-25

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