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EP1994805B1 - Ensemble circuit et procédé pour faire fonctionner une lampe à décharge haute pression - Google Patents

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

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Publication number
EP1994805B1
EP1994805B1 EP07712190A EP07712190A EP1994805B1 EP 1994805 B1 EP1994805 B1 EP 1994805B1 EP 07712190 A EP07712190 A EP 07712190A EP 07712190 A EP07712190 A EP 07712190A EP 1994805 B1 EP1994805 B1 EP 1994805B1
Authority
EP
European Patent Office
Prior art keywords
switch
pressure discharge
voltage
discharge lamp
circuit arrangement
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
EP07712190A
Other languages
German (de)
English (en)
Other versions
EP1994805A1 (fr
Inventor
Alois Braun
Joachim MÜHLSCHLEGEL
Walter Limmer
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
Osram GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP1994805A1 publication Critical patent/EP1994805A1/fr
Application granted granted Critical
Publication of EP1994805B1 publication Critical patent/EP1994805B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
    • H05B41/2883—Load circuits; Control thereof the control resulting from an action on the static converter the controlled element being a DC/AC converter in the final stage, e.g. by harmonic mode starting
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the present invention relates to a circuit arrangement for operating a high-pressure discharge lamp comprising a bridge circuit having at least two switches and a control device which is designed to control the at least two switches. It also relates to a method of operating a high-pressure discharge lamp on a circuit comprising a half-bridge circuit having exactly two switches, a control device which turns on and off the first and second switches of the half-bridge circuit alternately at a first frequency, and during the off-phase of the one switch the other switch with a square wave signal of a second frequency, which is greater than the first frequency, and a predetermined duty cycle controls.
  • the present invention generally relates to the problem of extinguishing high-pressure discharge lamps.
  • high-pressure discharge lamps are operated on a full-bridge circuit, ie on a bridge circuit with four switches.
  • DE 199 17 180 A1 discloses a high pressure discharge lamp operated by a half-bridge circuit.
  • the object of the present invention is therefore the circuit arrangement mentioned at the outset or the operating method mentioned at the outset in such a way that the operation of as many types of high-pressure discharge lamps is also possible using a half-bridge circuit.
  • the present invention is based on the finding that a half-bridge circuit is less "stiff" in comparison to a full-bridge circuit, ie has fewer voltage reserves (too low no-load voltage).
  • Fig. 1 to explain the resulting consequences of the time course of the so-called intermediate circuit voltage U ZW , which is applied to the half-bridge circuit, and the time course of the current I L through the lamp and the voltage U L to the lamp.
  • the zero line for the voltage U L is marked "4", while the zero line for the current I L is labeled "3".
  • a control device which alternately turns on and off the first and second switches of the half-bridge circuit at a first frequency and during the off phase of one switch, the other switch with a square wave signal of a second frequency which is greater than the first frequency , and a predetermined duty cycle controls.
  • the first frequency is in the embodiment of Fig. 1 at 160 Hz, while the second frequency is at 90 kHz.
  • the duty cycle of the square wave signal of the second frequency is constant and is about 6 ⁇ s.
  • Fig. 1 Due to the real converter output characteristic, which is flatter in a half-bridge circuit than in a full-bridge circuit, the burning voltage of the high-pressure discharge lamp after commutation increases due to the extremely non-linear load, which is a high-pressure discharge lamp.
  • the lamp current I L rises after commutation only to about half the nominal value and then drops to zero due to plasma cooling and consequent further increase in the burning voltage.
  • a measurement of the lamp current I L is possible with reasonable effort in a half-bridge circuit only in one direction with respect to the first frequency. In the other direction, the monitoring would therefore be "blind” and could not counteract the increase in the burning voltage taking place during such a cycle.
  • a measurement of the lamp current in both current directions constantly or with a high sampling rate results in an undesirably high cost, especially if, as in the exemplary embodiment, the first frequency is relatively low.
  • the invention takes a different approach.
  • An increase of the burning voltage can be detected easily with a voltage measuring device. This can be done without much effort for both directions realize the first frequency. It is also based on keeping the first frequency substantially constant, but increasing the switch-on duration of the signal with which one switch of the half-bridge circuit is activated during the off phase of the other switch, at least for a predefinable time duration. This can cause an increase in the lamp current, which together with the increase in the operating voltage of the lamp leads to a power converted in the lamp, which is sufficient to prevent cooling of the plasma, which would cause the lamp to extinguish.
  • the second frequency is reduced. This offers the advantage that the half-bridge switches then turn on when the current in the lamp inductor is equal to zero. This reduces the switching losses in the half-bridge switches.
  • the second frequency is at least 15 kHz, while the first frequency is at most 500 Hz.
  • the predefinable time duration of the increase of the duty cycle is at least 30 ⁇ s, in particular at least 100 ⁇ s, and at most 3 ms, in particular at most 500 ⁇ s.
  • the voltage measuring device, the reference value device, the comparison device and the Control device dimensioned such that the period between the actual exceeding of the at least one threshold and the driving of the two switches of the half-bridge circuit with the increased duty cycle a maximum of 1 ms, in particular a maximum of 0.3 ms.
  • the at least one threshold may be a constant threshold; However, it may also be a limit that depends on the average voltage across the high pressure discharge lamp.
  • the latter realization takes into account an age-related shift of the standard burning voltage and makes it possible to detect a deviation independently of the life of the high-pressure discharge lamp.
  • the average voltage of the high-pressure discharge lamp is preferably updated at equidistant times, for example every 50 to 100 ms.
  • control device is designed to measure the increase of the duty cycle as a function of the measured voltage across the high-pressure discharge lamp and / or the time average of the voltage across the high-pressure discharge lamp and / or from the relevant limit value.
  • the control device can furthermore be designed to ignore an exceeding of the limit value by the voltage measured at the high-pressure discharge lamp after the commutation of the current by the high-pressure discharge lamp for a predefinable period of time, in particular for at least 10 ⁇ s. This will ensure that the lamp voltage is not removed until after the period of ignoring, i. H. after the overshoot of the lamp voltage resulting from the commutation is upgraded. This overshoot is to be distinguished from the undesirable increase in the Brennspannüng, which is possible due to its temporal limitation.
  • Preferred embodiments of the circuit arrangement according to the invention are characterized in that after an increase in the switch-on duration for the predetermined period of time the duty cycle is stepped or continuously reduced again to the initial value. In this case, several intermediate stages may be provided. By this measure, a undershoot in the lamp current can be reliably avoided.
  • control device may also be designed to increase the duty cycle stepwise or continuously.
  • Fig. 2 shows a schematic representation of the structure of an embodiment of a circuit arrangement according to the invention.
  • the so-called intermediate circuit voltage U ZW is applied to the two switches S1, S2 in a half-bridge arrangement .
  • this is approximately 200 to 500 V and is usually generated from the mains voltage via a rectifier and a smoothing capacitor.
  • the half-bridge center HB is connected via a lamp inductor L D to a first terminal of the lamp LA.
  • a capacitor C 1 is connected, which is designed together with the lamp inductor L D to ignite the lamp LA.
  • I L the voltage drop across the lamp to U L.
  • the other terminal of the lamp LA is connected on the one hand via a coupling capacitor C K1 with the intermediate circuit voltage U ZW , on the other hand via a coupling capacitor C K2 with a reference potential, in this case ground.
  • the first lamp terminal is connected via a first voltage divider comprising the resistors R1 and R2, the second terminal of the lamp LA via a second voltage divider comprising the resistors R3 and R4 to the reference potential.
  • the respective taps of the two voltage dividers are connected to a voltage measuring device 10 for measuring the actual value of the voltage U L across the high-pressure discharge lamp LA for determining a voltage which is correlated with the lamp voltage U L.
  • a reference value device 12 provides at least one upper limit value for the voltage U L across the high-pressure discharge lamp LA to a comparison device 14.
  • the comparison device 14 is designed to provide the actual value of the voltage U L across the high-pressure discharge lamp LA, which is supplied by the voltage measuring device 10, with the at least one upper limit value for the Voltage U L across the high pressure discharge lamp LA, which provides the reference value device 12 to compare.
  • the circuit arrangement of Fig. 2 further comprises a control device 16 which is adapted to alternately turn on and off the first switch S1 and the second switch S2 of the bridge circuit at a first frequency, and during the off phase of the one switch S1, S2 the other switch S2, S1 with a Square wave signal of a second frequency, which is greater than the first frequency, and to control a predetermined duty cycle.
  • a control device 16 which is adapted to alternately turn on and off the first switch S1 and the second switch S2 of the bridge circuit at a first frequency, and during the off phase of the one switch S1, S2 the other switch S2, S1 with a Square wave signal of a second frequency, which is greater than the first frequency, and to control a predetermined duty cycle.
  • the comparison device determines that the actual value of the voltage U L across the high-pressure discharge lamp LA, in particular the amount thereof, is above the at least one limit value, it controls the control device 16 in such a way that it supplies the presettable duty cycle of the signal with which the one switch S1, S2 of the half-bridge circuit is driven during the off-phase of the other switch S2, S1, at least for a predeterminable period increased.
  • This increase in the switch-on time leads to an increase in the current I L through the high-pressure discharge lamp LA.
  • Fig. 3 shows the time course of various sizes, but it should be noted that compared to the representation of Fig. 1 the representation of Fig. 3 increased by a factor of 10.
  • the zero lines for the lamp voltage U L and the lamp current I L coincide and correspond to the center line of the representation, as shown to the left by the overlap of a 3 and a 4.
  • the lamp voltage U L is increased due to the non-linear characteristic of the high-pressure discharge lamp LA.
  • the lamp current I L remains well below its nominal value, in this case 0.4 A.
  • the lamp is operated with too little power and the plasma begins to cool.
  • the lamp current I L increases significantly to a value that is above the nominal value.
  • the burning voltage U L of the high-pressure discharge lamp decreases as a result of the current increase to normal values.
  • the duty cycle ⁇ t is lowered back to the normal value, so that the lamp is then continued to operate at its nominal current.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (14)

  1. Montage pour faire fonctionner une lampe à décharge à haute pression comprenant :
    - un circuit en pont ayant au moins deux interrupteurs ( S1, S2),
    - un dispositif ( 16 ) de commande, qui est conçu pour commander les au moins deux interrupteurs ( S1, S2) ;
    dans lequel le circuit en pont est constitué sous la forme d'un circuit en demi-pont ayant exactement deux interrupteurs ( S1, S2 ), le dispositif ( 16 ) de commande étant conçu pour fermer et ouvrir à une première fréquence en alternance le premier interrupteur ( S1 ) et le deuxième interrupteur ( S2 ) du circuit en demi-pont et, pendant la phase d'ouverture de l'un des interrupteurs ( S1, S2 ), pour commander l'autre interrupteur ( S2, S1 ) par un signal rectangulaire d'une deuxième fréquence, qui est plus haute que le première fréquence et avec une durée de fonctionnement pouvant être prescrite,
    caractérisé en ce que le montage comprend, en outre :
    - un dispositif ( 10 ) de mesure de la tension pour mesurer une valeur réelle de la tension aux bornes de la lampe ( LA ) à décharge à haute pression ;
    - un dispositif ( 12 ) à valeur de référence, qui met à disposition au moins une valeur limite supérieure de la tension ( UL ) aux bornes de la lampe ( LA ) à décharge à haute pression ;
    - un dispositif ( 14 ) de comparaison pour comparer la valeur réelle de la tension ( UL ) aux bornes de la lampe à décharge à haute pression à la au moins une valeur limite ;
    le dispositif ( 14 ) de comparaison étant conçu pour, dans le cas dans lequel la valeur réelle de la valeur ( UL ) aux bornes de la lampe ( LA ) à décharge à haute pression est plus haute que la au moins une valeur limite, commander le dispositif ( 16 ) de commande, de façon à ce que celui-ci augmente, pendant au moins un laps de temps pouvant être prescrit, la durée pouvant être prescrite de fonctionnement du signal par lequel l'un des interrupteurs ( S1, S2 ) du circuit en demi-pont est commandé pendant la phase d'ouverture de l'autre interrupteur ( S2, S1 ).
  2. Montage suivant la revendication 1,
    caractérisé en ce que
    le montage est conçu pour que l'augmentation de la durée ( Δt ) de fonctionnement entraîne une augmentation du courant ( IL ) passant dans la lampe ( LA ) à décharge à haute pression.
  3. Montage suivant la revendication 1 ou 2,
    caractérisé en ce que
    outre l'augmentation de durée ( Δt ) de fonctionnement, la deuxième fréquence est abaissée.
  4. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    la deuxième fréquence est d'au moins 15 kHz.
  5. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    la première fréquence est au maximum de 500 Hz.
  6. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    le laps de temps pouvant être prescrit de l'augmentation de la durée ( Δt ) de fonctionnement est d'au moins 30 µs, notamment d'au moins 100 µs, et au plus de 3 ms, notamment au plus de 500 µs.
  7. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    le dispositif ( 10 ) de mesure de la tension, le dispositif ( 12 ) à valeur de référence, le dispositif ( 14 ) de comparaison et le dispositif ( 16 ) de commandes sont tels que le laps de temps entre le dépassement réel de la au moins une valeur limite et la commande des deux interrupteurs ( S1, S2 ) du circuit en demi-pont à la durée ( Δt ) de fonctionnement augmentée est au maximum de 1 ms, notamment au maximum de 0,3 ms.
  8. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    la au moins une valeur limite est une valeur limite constante.
  9. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    la au moins une valeur limite est une valeur limite qui dépend de la moyenne de la tension aux bornes de la lampe ( LA ) à décharge à haute pression.
  10. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    le dispositif ( 16 ) de commande est conçu pour proportionner l'augmentation de la durée ( Δt ) de fonctionnement à la tension ( UL) mesurée aux bornes de la lampe ( LA ) à décharge à haute pression et/ou à la valeur moyenne dans le temps de la tension ( UL) aux bornes de la lampe à décharge à haute pression et/ou de la valeur limite déterminante.
  11. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    le dispositif ( 16 ) de commande est conçu pour négliger, notamment pendant au moins 10 µs, un dépassement de la valeur limite, par la tension ( UL ) mesurée aux bornes de la lampe ( LA ) à décharge à haute pression après la commutation du courant ( UL) passant dans la lampe ( LA ) à décharge à haute pression pendant un laps de temps, pouvant être prescrit.
  12. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    le dispositif ( 16 ) de commande est conçu pour diminuer, jusqu'à la valeur initiale, par palier ou d'une manière continue, la durée ( Δt) de fonctionnement après une augmentation de la durée ( Δt ) de fonctionnement pendant le laps de temps pouvant être prescrit.
  13. Montage suivant l'une des revendications précédentes,
    caractérisé en ce que
    le dispositif ( 16 ) de commande est conçu pour augmenter, par palier ou d'une manière continue, la durée ( Δt ) de fonctionnement.
  14. Procédé pour faire fonctionner une lampe ( LA ) à décharge à haute pression sur un montage comprenant un circuit en demi-pont ayant exactement deux interrupteurs ( S1, S2 ), un dispositif ( 16 ) de commande, qui ferme et ouvre à une première fréquence en alternance le premier ( S1 ) et le deuxième ( S2 ) interrupteurs du circuit en demi-pont et qui commande pendant la phase d'ouverture de l'un des interrupteurs ( S1, S2 ) l'autre interrupteur ( S2, S1 ) par un signal rectangulaire d'une deuxième fréquence, qui est plus haute que la première fréquence et d'une durée ( Δt ) de fonctionnement pouvant être prescrite,
    caractérisé par les stades suivants :
    a) on mesure une valeur réelle de la tension ( UL ) aux bornes de la lampe ( LA ) à décharge à haute pression ;
    b) on compare la valeur réelle de la tension ( UL ) aux bornes de la lampe ( LA ) à décharge à haute pression à au moins une valeur limite supérieure de la tension ( UL ) aux bornes de la lampe à décharge à haute pression ;
    c) dans le cas dans lequel la valeur réelle de la tension ( UL ) aux bornes de la lampe ( LA ) à décharge à haute pression est supérieure à la au moins une valeur limite :
    on augmente la durée ( Δt ) de fonctionnement du signal par lequel les deux interrupteurs ( S1, S2 ) du circuit en demi-pont sont commandés au moins pendant un laps de temps pouvant être prescrit.
EP07712190A 2006-02-20 2007-02-08 Ensemble circuit et procédé pour faire fonctionner une lampe à décharge haute pression Not-in-force EP1994805B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006007754A DE102006007754A1 (de) 2006-02-20 2006-02-20 Schaltungsanordnung und Verfahren zum Betreiben einer Hochdruckentladungslampe
PCT/EP2007/051230 WO2007096253A1 (fr) 2006-02-20 2007-02-08 Ensemble circuit et procédé pour faire fonctionner une lampe à décharge haute pression

Publications (2)

Publication Number Publication Date
EP1994805A1 EP1994805A1 (fr) 2008-11-26
EP1994805B1 true EP1994805B1 (fr) 2009-12-30

Family

ID=38042486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07712190A Not-in-force EP1994805B1 (fr) 2006-02-20 2007-02-08 Ensemble circuit et procédé pour faire fonctionner une lampe à décharge haute pression

Country Status (7)

Country Link
US (1) US8089220B2 (fr)
EP (1) EP1994805B1 (fr)
CN (1) CN101385399B (fr)
AT (1) ATE454027T1 (fr)
CA (1) CA2642576A1 (fr)
DE (2) DE102006007754A1 (fr)
WO (1) WO2007096253A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2498584A1 (fr) 2011-03-07 2012-09-12 Vossloh-Schwabe Deutschland GmbH Appareil de prémontage pour lampes à décharge haute pression

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010039430A1 (de) * 2010-08-18 2012-02-23 Osram Ag Elektronisches Vorschaltgerät und Verfahren zum Betreiben mindestens einer Entladungslampe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03138894A (ja) * 1989-10-23 1991-06-13 Nissan Motor Co Ltd 放電灯点灯装置
AU735261B2 (en) 1997-07-24 2001-07-05 Noontek Limited An electronic ballast for a gas discharge lamp
DE19917180A1 (de) 1998-04-18 1999-10-21 Manfred Diez Verfahren zum Betreiben eines Gasentladungsstrahlers, und Anordnung zur Durchführung eines solchen Verfahrens
US6437515B1 (en) 2000-01-18 2002-08-20 Matsushita Electric Works, Ltd. Discharge lamp lighting device of high startability with high pulse voltage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2498584A1 (fr) 2011-03-07 2012-09-12 Vossloh-Schwabe Deutschland GmbH Appareil de prémontage pour lampes à décharge haute pression

Also Published As

Publication number Publication date
DE102006007754A1 (de) 2007-08-23
US20090295302A1 (en) 2009-12-03
CA2642576A1 (fr) 2007-08-30
CN101385399B (zh) 2013-03-13
US8089220B2 (en) 2012-01-03
EP1994805A1 (fr) 2008-11-26
CN101385399A (zh) 2009-03-11
DE502007002487D1 (de) 2010-02-11
WO2007096253A1 (fr) 2007-08-30
ATE454027T1 (de) 2010-01-15

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