EP2274960B1 - Procédé et agencement de circuits pour faire fonctionner au moins une lampe à décharge - Google Patents

Procédé et agencement de circuits pour faire fonctionner au moins une lampe à décharge Download PDF

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Publication number
EP2274960B1
EP2274960B1 EP08736581A EP08736581A EP2274960B1 EP 2274960 B1 EP2274960 B1 EP 2274960B1 EP 08736581 A EP08736581 A EP 08736581A EP 08736581 A EP08736581 A EP 08736581A EP 2274960 B1 EP2274960 B1 EP 2274960B1
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EP
European Patent Office
Prior art keywords
threshold value
value
lamp
coupled
coil
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Not-in-force
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EP08736581A
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German (de)
English (en)
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EP2274960A1 (fr
Inventor
Peter Krummel
Andreas Mitze
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Osram GmbH
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Osram GmbH
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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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps

Definitions

  • the present invention relates to a method for operating at least one discharge lamp on a circuit arrangement having an input with a first and a second input terminal for connecting a DC supply voltage, an output with at least a first and a second output terminal for connecting the at least one discharge lamp, an inverter with at least a first and a second electronic switch coupled in series between the first and second input terminals, wherein a center of the inverter is formed between the first and second switches, an ignition device comprising a lamp choke and a resonance capacitor, a preheater, which comprises the series connection of a primary inductance, a third electronic switch and a current measuring resistor, which is coupled between the center of the inverter and the second input terminal, as well as a first and a second secondary inductance coupled to the primary winding, wherein the first secondary inductance is coupled to the first output terminal and the second secondary inductance is coupled to the second output terminal, a control device coupled to the current measuring resistor, in which at least two different types of operating parameter sets assigned to different
  • Such a circuit arrangement is known from the DE 103 45 610 A1 and is to facilitate understanding in Fig. 1 shown.
  • This shows a circuit arrangement with two field effect transistors T1, T2, which are arranged in the manner of a half-bridge inverter. Both field effect transistors receive their control signal from a microcontroller MC.
  • a DC link capacitor C1 Parallel to the DC voltage input of the half-bridge inverter T1, T2, a DC link capacitor C1 is arranged with a comparatively large capacity.
  • the intermediate circuit capacitor C1 serves as a DC voltage source and provides the so-called intermediate circuit voltage U Zw for the half-bridge inverter.
  • the intermediate circuit voltage U Zw is usually about 400 V and is from the Mains AC voltage generated by a mains voltage rectifier (not shown) and a boost converter (not shown).
  • the DC link capacitor C1 is arranged parallel to the voltage output of the boost converter.
  • a load circuit formed as a series resonant circuit, which essentially consists of the lamp inductor L1 and the ignition capacitor C2.
  • Parallel to the ignition capacitor C2, the discharge path of the fluorescent lamp LP and the capacitor C3 are connected, which is charged during operation of the lamp in the steady state of the half-bridge inverter to half the supply voltage of the half-bridge inverter.
  • the lamp electrodes E1, E2 of the fluorescent lamp LP are formed as electrode filaments each having two electrical terminals.
  • a secondary winding SI1, SI2 of a transformer is in each case connected, which serves for the inductive heating of the electrode filaments E1, E2.
  • the primary winding P1 of this transformer is connected in series with the switching path of a further field effect transistor T3, whose control electrode is also acted upon by the microcontroller MC with control signals, and a measuring resistor R1, wherein above the measuring resistor R1, a voltage Res decreases, with the reciprocal of the electrical Resistance of a helix E1, E2 of the discharge lamp LP is correlated.
  • the series circuit of the components P1, T3 and R1 is connected to the output M of the half-bridge inverter.
  • a first terminal of the primary winding P1 is connected to the output or center tap M of the half-bridge inverter and to the lamp inductor L1, while the second Terminal of the primary winding P1 is connected to the field effect transistor T3 and DC in the forward direction via a diode D1 to the high potential terminal (+) of the DC link capacitor C1.
  • a first terminal of the measuring resistor R1 is connected to the ground potential (-), while the second terminal of the measuring resistor is connected to the field effect transistor T3 and via a low-pass filter R2, C4 to the voltage input A of the microcontroller MC.
  • the load circuit L1, C2, LP acted upon in a known manner with a high-frequency AC voltage whose frequency is determined by the switching clock of the transistors T1, T2 and in the range of about 50 kHz to about 150 kHz.
  • the transistor T3 is turned on and off by the microcontroller MC in synchronism with the transistor T1.
  • the voltage drop across the measuring resistor R1 is averaged over a time interval of a plurality of switching cycles of the transistor T3 and supplied to the voltage input A of the microcontroller MC.
  • the input voltage at terminal A of the microcontroller MC is converted by means of an analog-to-digital converter into a digital signal and evaluated in the microcontroller MC.
  • the microcontroller MC detects the voltage drop across the capacitor C4 the first time after about 30 ms after the start of the heating phase and the second time about 600 ms after the start of the heating phase. If the absolute value of the difference of the two voltage values exceeds a predetermined threshold value, the voltage value at the end of the heating phase is compared with a reference value stored in the microcontroller MC and used for lamp type detection. Here, the voltage value, as mentioned, correlates with the inverse of the coil resistance. If the absolute value of the difference between the two voltage values lies below the threshold value, the lamp is still operated with the current data record, ie no lamp type recognition is performed.
  • step 100 the known method starts. Subsequently, in step 110, it is checked whether the intermediate circuit voltage U Zw has reached its setpoint value U Zwsoll . If this is not the case, the intermediate circuit voltage U Zw is increased in step 120. If it is determined in step 110 that the intermediate circuit voltage U Zw has reached its setpoint value U Zwsoll , in step 130 at a first time t 1 a first value Reslnew of the voltage drop across the measuring resistor R1 correlated with the filament resistance of one filament of the fluorescent lamp LP and to a second one Time t 2 determines a second value Res2neu this voltage drop. In step 140, the difference (Reslnew - Res2new) against a first threshold S1 is compared.
  • an algorithm for lamp type detection is performed. This includes the steps 150 to 230. This is first in step 150, the absolute amount re s ⁇ 2 ⁇ New re s ⁇ 2 ⁇ old - 1 compared with a threshold value X1, where Res2new represents the currently measured value of the voltage drop across the measuring resistor R1 and Res2old represents the value of the previous measurement. Is the value of the absolute value re s ⁇ 2 ⁇ New re s ⁇ 2 ⁇ old - 1 below the threshold X1, the lamp is operated in step 160 with the current operating parameter set. The new value Res2new differs very little from the old value Res2alt, so that the same lamp is unquestionably connected to the circuit arrangement.
  • step 160 the value of re s ⁇ 2 ⁇ New re s ⁇ 2 ⁇ old - 1 above the threshold X1
  • step 170 it is determined in step 170 whether the value re s ⁇ 2 ⁇ New re s ⁇ 2 ⁇ old - 1 between the threshold X1 and a threshold X2, where X2 is greater than X1. If this is in the affirmative, it is assumed that it is still the same lamp that has only aged a little bit. Therefore, in step 180, the old value Res2old is overwritten by the new value Res2new. The lamp is then further operated in step 190 with the current record.
  • step 170 it is determined that the value re s ⁇ 2 ⁇ New re s ⁇ 2 ⁇ old - 1 is not between X1 and X2, the value of Res2new is looked up in a table to see which lamp type this Res2new is assigned to. If the corresponding lamp data record is detected in step 200, the lamp is in step 210 with the detected lamp data i operated. In step 220, Res2alt is overwritten by Res2new. If no lamp data set ordered to the Res2 ref found in step 200, the lamp is operated in step 230 with a default data set.
  • step 140 If it is determined in step 140 that the difference between Reslnew and Res2new is below the threshold value S1, it is checked in step 240 whether the difference (Reslnew - Res2new) is below a second threshold value S2 which is smaller than the threshold value S1. If this is the case, in step 250 a dummy coil is assumed or a coil short circuit. If a dummy coil can be excluded (it is recognizably a lamp used), then there is a coil short circuit and the circuit is switched off. If it is determined in step 240 that the difference between Reslnew and Res2new is greater than the threshold S2, the lamp will continue to operate in step 260 with the current record.
  • the object of the present invention is to further develop the method mentioned at the outset or the circuit arrangement mentioned at the outset in such a way that reliable operation of a plurality of luminaires on a circuit arrangement is made possible.
  • the present invention is based on the finding that, in the procedure according to the prior art, damage to the circuit arrangements therefore occurs because, although they occur in short lines, but not in long lines, such as occur when operating a plurality of luminaires with a circuit arrangement , can recognize.
  • Spiral short circuits with long lines are characterized by the fact that the difference between the first measured value of the voltage drop across the measuring resistor and the second measured value of the voltage drop across the measuring resistor is greater than with a short-circuited short-circuit.
  • the threshold S2 was raised in step 240 for longer lines, then this would lead to a false detection of a short-circuit of the filament and to a false and thus undesired disconnection in the case of a lamp whose filaments were not completely cooled due to previous operation lead the circuit.
  • the difference (Res1new - Res2new) is greater than the threshold value S22, that a further case distinction is necessary, since otherwise a switched-on lamp would not be operated.
  • the present invention therefore provides that if it is determined in step 240 that the difference (Reslnew - Res2new) is greater than the threshold value S2, another case distinction is made: If Res2new is greater than a third threshold, with the third threshold being less than the first and greater than the second threshold, a coil short is detected. However, if Res2new is not greater than the third threshold, the lamp will continue to operate with the current operating parameter set. This measure takes into account that the value Res2new at power up is small compared to the value Res2new for a short circuit on longer lines.
  • a preferred embodiment is characterized in that it comprises the following further steps: If the difference (Res1new - Res2new) is less than the second threshold value, the following steps are carried out: If the second measured value lies between a fourth and a fifth threshold value, the fifth Threshold is less than the fourth threshold, the lamp type detection is locked. If the second reading is above the fourth threshold, a filament short is detected. If the second reading is below the fifth threshold, a dummy helix is detected.
  • the locking of the lamp type detection allows a luminaire manufacturer to ensure operation of a deployed lamp with a set of parameters that he has specified. For example, a luminaire manufacturer can design a luminaire for 50 W, thereby ensuring that even an 80-watt lamp used only operates like a 50-watt lamp. This allows in particular a weaker dimensioning of the performance-relevant elements of the lamp.
  • a shutdown is performed, i. H. a shutdown of the circuitry to avoid damage to the circuitry.
  • information about the occurrence of a shutdown is generated, which facilitates troubleshooting.
  • the first and / or the second threshold value are formed by the product of a factor a and the second value Res2new, where 0 ⁇ a ⁇ 2.
  • the first and second threshold values become dependent on the measured voltage value Res2new. This has proven to be more advantageous in practice than if using absolute values at this point would.
  • the threshold S2 may be, for example, Res2new / 16.
  • the third threshold value S3 is preferably formed by the product of a factor b having the fourth threshold value S4, where 0 ⁇ b ⁇ 1, the fourth threshold value S4 being greater than the second value Res2new caused by the lowest-resistance coil, and the fifth threshold value S5 being smaller is the fourth threshold.
  • step 270 For example, if it is determined in step 240 that the difference (Res1new - Res2new) is greater than a second threshold S2, the second threshold being less than the first threshold S1, another case distinction is made in step 270: If it is determined that if the value Res2new is greater than a third threshold S3, in step 280 a helical short circuit is detected, or if there has been a locking of the lamp type identifier according to steps 150 to 230, this is unlocked. If it is determined in step 270 that Res2new is not greater than the third threshold value S3, the lamp is operated in step 290 with the current operating parameter set.
  • step 300 it is checked whether the value Res2new is greater than a fourth threshold value S4. If this is answered in the affirmative, Thus, in step 310, a short-circuited circuit is detected, or if the lamp type detection was locked in accordance with steps 150 to 230, this unlocked. If, on the other hand, it is determined in step 300 that the value Res2new is smaller than the fourth threshold value S4, a further case distinction is made in step 310. In this case, it is checked whether Res2new is greater than a fifth threshold value S5, the fifth threshold value being smaller than the fourth threshold value S4. If this is the case, the lamp type detection is locked according to steps 150 to 230 in step 320. If this is not the case, however, a dummy coil is assumed in step 330.
  • the algorithm of the method according to the invention is in the microcontroller MC of Fig. 1 implemented. This has in particular the required storage and comparison devices.
  • Fig. 4 shows, for further understanding, the time course of the voltage drop Res across the current measuring resistor R1, which is correlated with the reciprocal of the helical resistance, for different situations:
  • Curve a) indicates the time course in the case of a dummy helix, curve b) in the case of a short-circuited helix, curve c ) in the case of a short-circuited coil for longer lines, curve d) in the case of intact helices and curve e) when restarting, ie the coils were not cooled from the previous operation.
  • the present invention makes it possible to detect a short-circuit of the filament both for short (curve b) and for longer lines (curve c). It allows operation of the fluorescent lamp when switched on in the cooled state (curve d) as well as when switching on in the not yet cooled state (curve e). Finally, an inserted dummy coil (curve a) is still reliably detected.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (7)

  1. Procédé pour faire fonctionner au moins une lampe à décharge (LP) sur un agencement de circuits comprenant une entrée avec un premier et un deuxième raccordement d'entrée destinés à raccorder une tension continue d'alimentation (UZw) ; une sortie avec au moins un premier et un deuxième raccordement de sortie destinés à raccorder ladite au moins une lampe à décharge (LP) ; un onduleur avec au moins un premier (T1) et un deuxième commutateur électronique (T2), couplés en série entre le premier et le deuxième raccordement d'entrée, un point central (M) de l'onduleur étant formé entre le premier (T1) et le deuxième commutateur (T2) ; un dispositif d'allumage qui comprend une bobine de lampe (L1) et un condensateur de résonance (C2) ; un dispositif de préchauffage qui comprend le montage en série d'une inductance primaire (P1), d'un troisième commutateur électronique (T3) et d'une résistance de mesure de courant (R1), ledit montage étant couplé entre le point central (M) de l'onduleur et le deuxième raccordement d'entrée, ainsi qu'une première (SI1) et une deuxième inductance secondaire (SI2) couplées à l'enroulement primaire (P1), la première inductance secondaire (SI1) étant couplée au premier raccordement de sortie et la deuxième inductance secondaire (SI2) au deuxième raccordement de sortie ; un dispositif de commande (MC) couplé à la résistance de mesure de courant (R1) et dans lequel sont stockés des jeux de paramètres de fonctionnement associés à au moins deux types différents de lampes à décharge, un jeu de paramètres de fonctionnement représentant un jeu de paramètres de fonctionnement actuel, le dispositif de commande (MC) étant conçu pour commander selon le jeu de paramètres de fonctionnement actuel au moins le premier (T1), le deuxième (T2) et le troisième commutateur électronique (T3); dans la phase de préchauffage, une première valeur (Res1neu) de la chute de tension aux bornes de la résistance de mesure de courant (R1), corrélée avec la valeur inverse de la résistance électrique d'au moins un filament spiralé (E1) de ladite au moins une lampe à décharge (LP), est déterminée à un premier instant (t1) et une deuxième valeur (Res2neu) de la chute de tension aux bornes de la résistance de mesure de courant (R1), corrélée avec la valeur inverse de la résistance électrique dudit au moins un filament spiralé (E1) de ladite au moins une lampe à décharge (LP), est déterminée à un deuxième instant (t2), le deuxième instant (t2) se situant après le premier instant (t1) ;
    caractérisé par les étapes suivante
    a) déterminer la différence entre la première (Res1neu) et la deuxième valeur (Res2neu) (étape 140) ;
    b)
    b1) si la différence dépasse une première valeur seuil (S1) :
    exécuter un algorithme de reconnaissance de type de lampe (étapes 150 à 230);
    b2) si la différence ne dépasse pas la première valeur seuil (S1) :
    c1) si la différence est supérieure à une deuxième valeur seuil (S2), la deuxième valeur seuil (S2) étant inférieure à la première valeur seuil (S1) (étape 240) :
    d1) si la deuxième valeur est supérieure à une troisième valeur seuil (S3) (étape 270) :
    diagnostiquer un court-circuit de filament (étape 280) ;
    d2) si la deuxième valeur n'est pas supérieure à la troisième valeur seuil (S3) :
    faire fonctionner la lampe avec le jeu de paramètres de fonctionnement actuel (étape 290).
  2. Procédé selon la revendication 1
    caractérisé en ce que
    il comprend les étapes supplémentaires suivantes :
    c2) si la différence est inférieure à la deuxième valeur seuil (S2) :
    d1) si la deuxième valeur mesurée se situe entre une quatrième (S4) et une cinquième valeur seuil (S5), la cinquième valeur seuil (S5) étant inférieure à la quatrième valeur seuil (S4) :
    verrouillage de la reconnaissance de type de lampe (étape 320) ;
    d2) si la deuxième valeur mesurée se situe au-dessus de la quatrième valeur seuil (S4) :
    diagnostiquer un court-circuit de filament (étape 310) ;
    d3) si la deuxième valeur mesurée si situe au-dessous de la cinquième valeur seuil (S5) :
    diagnostiquer un filament mort (étape 330).
  3. Procédé selon l'une des revendications 1 ou 2,
    caractérisé en ce que
    lorsqu'un court-circuit de filament est diagnostiqué quand la reconnaissance de type de lampe est verrouillée, la reconnaissance de type de lampe est déverrouillée (étapes 280, 310).
  4. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    après avoir diagnostiqué un court-circuit de filament, une coupure est effectuée.
  5. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la première (S1) et/ou la deuxième valeur seuil (S2) sont formées par le produit d'un facteur a par la deuxième valeur, où 0 < a < 2.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la troisième valeur seuil (S3) est formée par le produit d'un facteur b par la quatrième valeur seuil (S4), où 0 < b < 1, la quatrième valeur seuil (S4) étant supérieure à la deuxième valeur (Res2neu) produite par le filament avec la plus basse résistance et la cinquième valeur seuil (S5) étant inférieure à la quatrième valeur seuil.
  7. Agencement de circuits pour faire fonctionner au moins une lampe à décharge (LP), comprenant
    - une entrée avec un premier et un deuxième raccordement d'entrée destinés à raccorder une tension continue d'alimentation (UZw) ;
    - une sortie avec au moins un premier et un deuxième raccordement de sortie destinés à raccorder ladite au moins une lampe à décharge (LP) ;
    - un onduleur avec au moins un premier (T1) et un deuxième commutateur électronique (T2), couplés en série entre le premier et le deuxième raccordement d'entrée, un point central (M) de l'onduleur étant formé entre le premier (T1) et le deuxième commutateur (T2) ;
    - un dispositif d'allumage qui comprend une bobine de lampe (L1) et un condensateur de résonance (C2) ;
    - un dispositif de préchauffage qui comprend le montage en série d'une inductance primaire (P1), d'un troisième commutateur électronique (T3) et d'une résistance de mesure de courant (R1), ledit montage étant couplé entre le point central (M) de l'onduleur et le deuxième raccordement d'entrée, ainsi qu'une première (SI1) et une deuxième inductance secondaire (SI2) couplées à l'enroulement primaire (P1), la première inductance secondaire (SI1) étant couplée au premier raccordement de sortie et la deuxième inductance secondaire (SI2) au deuxième raccordement de sortie ;
    - un dispositif de commande (MC) couplé à la résistance de mesure de courant (R1) et dans lequel sont stockés des jeux de paramètres de fonctionnement associés à au moins deux types différents de lampes à décharge, un jeu de paramètres de fonctionnement représentant un jeu de paramètres de fonctionnement actuel, le dispositif de commande (MC) étant conçu pour commander selon le jeu de paramètres de fonctionnement actuel au moins le premier (T1), le deuxième (T2) et le troisième commutateur électronique (T3); le dispositif de commande (MC) étant conçu en outre pour déterminer dans la phase de préchauffage une première valeur (Res1neu) de la chute de tension aux bornes de la résistance de mesure de courant (R1), corrélée avec la valeur de la résistance électrique d'au moins un filament spiralé (E1) de ladite au moins une lampe à décharge (LP), à un premier instant (t1) et une deuxième valeur (Res2neu) de la chute de tension aux bornes de la résistance de mesure de courant (R1), corrélée avec la résistance électrique dudit au moins un filament spiralé (E1) de ladite au moins une lampe à décharge (LP), à un deuxième instant (t2), le deuxième instant (t2) se situant après le premier instant (t1) ;
    caractérisé en ce que
    le dispositif de commande (MC) est conçu en outre pour exécuter l'algorithme suivant :
    a) déterminer la différence entre la première (Res1neu) et la deuxième valeur (Res2neu) (étape 140) ;
    b)
    b1) si la différence dépasse une première valeur seuil (S1) (étapes 150 à 230):
    exécuter un algorithme de reconnaissance de type de lampe
    b2) si la différence ne dépasse pas la première valeur seuil (S1) .
    c1) si la différence est supérieure à une deuxième valeur seuil (S2), la deuxième valeur seuil (S2) étant inférieure à la première valeur seuil (S1) (étape 240) :
    d1) si la deuxième valeur est supérieure à une troisième valeur seuil (étape 270) :
    diagnostiquer un court-circuit de filament (étape 280) ;
    d2) si la deuxième valeur n'est pas supérieure à la troisième valeur seuil (S3) :
    faire fonctionner la lampe avec le jeu de paramètres de fonctionnement actuel (étape 290).
EP08736581A 2008-04-25 2008-04-25 Procédé et agencement de circuits pour faire fonctionner au moins une lampe à décharge Not-in-force EP2274960B1 (fr)

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PCT/EP2008/055074 WO2009129860A1 (fr) 2008-04-25 2008-04-25 Procédé et agencement de circuits pour faire fonctionner au moins une lampe à décharge

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EP2274960A1 EP2274960A1 (fr) 2011-01-19
EP2274960B1 true EP2274960B1 (fr) 2013-02-27

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US (1) US8796941B2 (fr)
EP (1) EP2274960B1 (fr)
KR (1) KR20110007225A (fr)
CN (1) CN102017809B (fr)
WO (1) WO2009129860A1 (fr)

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EP2274960B1 (fr) * 2008-04-25 2013-02-27 OSRAM GmbH Procédé et agencement de circuits pour faire fonctionner au moins une lampe à décharge
EP3223588B1 (fr) * 2016-03-21 2020-04-08 Valeo Iluminacion Gestion de l'information bin dans un module lumineux pour véhicule automobile comprenant des sources lumineuses à élément semi-conducteur
KR102573957B1 (ko) 2021-02-26 2023-09-01 충남대학교산학협력단 공유 사물함 시스템

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DE19850441A1 (de) * 1998-10-27 2000-05-11 Trilux Lenze Gmbh & Co Kg Verfahren und Vorschaltgerät zum Betrieb einer mit einer Leuchtstofflampe versehenen Leuchte
DE10345610A1 (de) 2003-09-29 2005-05-12 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zum Betreiben mindestens einer Niederdruckentladungslampe
DE102005006716A1 (de) 2004-02-04 2006-02-23 Revolux Gmbh Digitales EVG zum dimmbaren Betrieb von Leuchtstofflampen
DE102005013564A1 (de) * 2005-03-23 2006-09-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Betreiben mindestens einer Lampe
DE102005046482A1 (de) 2005-09-28 2007-03-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zum Einstellen eines elektronischen Vorschaltgeräts
EP2274960B1 (fr) * 2008-04-25 2013-02-27 OSRAM GmbH Procédé et agencement de circuits pour faire fonctionner au moins une lampe à décharge

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US20110037393A1 (en) 2011-02-17
WO2009129860A1 (fr) 2009-10-29
KR20110007225A (ko) 2011-01-21
CN102017809B (zh) 2013-11-06
US8796941B2 (en) 2014-08-05
EP2274960A1 (fr) 2011-01-19
CN102017809A (zh) 2011-04-13

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