EP0558772B1 - Circuit pour le fonctionnement de plusieurs lampes fluorescentes avec un ballast - Google Patents

Circuit pour le fonctionnement de plusieurs lampes fluorescentes avec un ballast Download PDF

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Publication number
EP0558772B1
EP0558772B1 EP92103567A EP92103567A EP0558772B1 EP 0558772 B1 EP0558772 B1 EP 0558772B1 EP 92103567 A EP92103567 A EP 92103567A EP 92103567 A EP92103567 A EP 92103567A EP 0558772 B1 EP0558772 B1 EP 0558772B1
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EP
European Patent Office
Prior art keywords
lamp
circuit
fluorescent lamps
switching
circuits
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.)
Expired - Lifetime
Application number
EP92103567A
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German (de)
English (en)
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EP0558772A1 (fr
Inventor
Jürgen Dipl.-Ing. Klier
Bernhard Dipl.-Ing. Orben
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Siemens AG
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Siemens AG
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Publication date
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Priority to AT92103567T priority Critical patent/ATE143208T1/de
Priority to DE59207186T priority patent/DE59207186D1/de
Priority to EP92103567A priority patent/EP0558772B1/fr
Publication of EP0558772A1 publication Critical patent/EP0558772A1/fr
Application granted granted Critical
Publication of EP0558772B1 publication Critical patent/EP0558772B1/fr
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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
    • H05B41/282—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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/29—Circuits providing for substitution of the light source in case of its failure

Definitions

  • the invention relates to a circuit arrangement according to the preamble of claim 1.
  • the known circuit arrangement also has a monitoring device with which the lamp circuits are monitored for a fault condition in which high ignition voltage is present for an unacceptably longer time than a predetermined period of time. This can happen if one of the fluorescent lamps no longer ignites properly at the end of its service life. However, there may also be a leak in the fluorescent lamp, which prevents it from igniting. If this fault condition is determined by the monitoring device with a predetermined time delay, it switches off an inverter of the electronic ballast and thus prevents the ignition voltage from being present again. By switching off the electronic ballast, the fluorescent lamp, which is in itself operational, is of course also switched off. This does not occur in a single error case, namely when a fluorescent lamp is deactivated due to a filament break. Since the lamp circuit of the defective fluorescent lamp is interrupted in this case, the monitoring device will not respond despite the error that has occurred. The ready-to-use fluorescent lamp or, in individual cases, several fault-free fluorescent lamps will continue to burn.
  • the present invention is therefore based on the object of developing a circuit arrangement according to the preamble of claim 1 such that further operation of the fluorescent lamps, which are still intact, is possible even in the case of a high ignition voltage which is initially impermissibly long in a lamp circuit.
  • this object is achieved according to the invention by the features described in the characterizing part of this claim.
  • the simplest case of two lamp circuits operated jointly via a single electronic ballast ie. H. assumed a 2-lamp arrangement. If one of the two fluorescent lamps causes one of the faults that no longer allow re-ignition, but does cause the high ignition voltage to be present at the deactivated fluorescent lamp, this fault condition is detected with a predetermined delay. The delay period is determined in such a way that a normally operating fluorescent lamp ignites during this time, but on the other hand the high ignition voltage is not present for an unacceptably long time. But now - as with the known solution - the electronic ballast is not shut down immediately and the fluorescent lamp working correctly is therefore extinguished; rather, 1-lamp operation is enabled despite the error that has occurred.
  • the switching device is designed to be resettable in such a way that it deactivates itself when the defective fluorescent lamp is removed and falls back into its rest position.
  • the criterion is used that the holding current of the switching device is halved when the defective fluorescent lamp, which is still carrying current through the lamp filaments, is halved.
  • the switching device detects this change and is designed so that it can no longer hold itself, so that it falls back into the rest position. In this way, with ignited intact fluorescent lamps, it is possible to replace a defective fluorescent lamp without having to switch off the electronic ballast even for a short time. After changing the lamp, the normal operating state is restored, in which both fluorescent lamps burn.
  • the solution according to the invention in connection with the known monitoring device.
  • the known monitoring device also responds with a delay to the high ignition voltage being present for too long.
  • the response times of the switching device according to the invention and the known monitoring device are coordinated with one another in such a way that the switching device reacts to a detected fault state earlier than the monitoring device.
  • the switching device activated in the event of a fault, the cause of the high ignition voltage present is usually no longer effective for the circuit.
  • the switching device according to the invention which had already been activated, could no longer detect this change in state.
  • the known monitoring device then responds with the delay specified for it and switches off the electronic ballast and thus all connected lamp circuits.
  • the solution according to the invention works perfectly even in the event of a broken filament of one of the monitored fluorescent lamps.
  • the switching device according to the invention is not activated as long as only one of the two monitored fluorescent lamps is working properly, since an inadmissibly long high ignition voltage does not occur. If, however, the second fluorescent lamp were also no longer lit, the monitoring would occur.
  • the switching device according to the invention is first activated. However, the switching measure triggered in this way cannot correct the fault, so that the monitoring device then responds and the electronic ballast and thus also the monitored lamp circuits are shut down.
  • this circuit concept which takes into account all possible lamp faults and nevertheless enables the undisturbed operation of the still intact fluorescent lamps, can also be applied to arrangements with more than two fluorescent lamps.
  • two lamp circuits will preferably be monitored in pairs, with one of the lamp circuits of each pair always being the same.
  • An individual switching device is therefore required for each pair of monitored circuits, so that the circuit complexity increases somewhat, but a criterion is formed with which it can be ascertained which lamp circuits are malfunctioning.
  • the actual lamp circuits are connected to the output of this inverter 3. They contain two lamp chokes DR1 and DR2, which in the operating mode shown in FIG.
  • Ignition capacitors are in each case parallel to the discharge paths of the fluorescent lamps LL1 and LL2 CZ1 or CZ2 switched, ie connected on one side to one of the two lamp filaments.
  • a half-bridge capacitor CHB is provided in the reflux branch of the two lamp circuits.
  • This circuit part and a monitoring circuit 4 which is also assigned to the lamp circuits and which detects a faulty operating state in which the high ignition voltage is present for at least one of the fluorescent lamps and then switches off the inverter 3 are known per se.
  • This known circuit arrangement allows the monitoring of a malfunction in the lamp control only under certain conditions.
  • the only monitoring criterion is namely that the high ignition voltage has been present for too long, so that the monitoring circuit 4 always switches off the inverter 3 when only one of the fluorescent lamps LL1 or LL2 is working incorrectly with the filaments intact, ie. H. cannot be ignited. In such a case, single lamp operation is not possible. It would only exist if the ignition circuit in the faulty fluorescent lamp were broken due to a filament break.
  • a controlled switch S1 with a changeover contact s is additionally provided in the lamp circuits.
  • This switch S1 is assigned a control circuit 5, which is integrated in the lamp circuits and detects the operating function of the fluorescent lamps LL1 and LL2.
  • the control circuit 5 detects an operating state in which the lamp ignition voltage on one of the fluorescent lamps LL1 or LL2 is present for longer than a predetermined time period tl. This period of time tl is in turn shorter than the response time t2 of the monitoring circuit 4. If this faulty operating state determined, the control circuit 5 switches the switch S1. The changeover contact s disconnects one of the lamp circuits and places this lamp circuit in parallel with the other at the output of only one of the two lamp inductors, for. B. DR1. This means that only one of the two lamp chokes, here DR1, is effective.
  • FIG. 2 shows a circuit arrangement with its functionally essential elements as an example of the configuration of the control circuit 5.
  • the connection points of the control circuit 5 to the lamp circuits are denoted by a to d.
  • the connections a and b are the connection points to the lamp chokes DR1 and DR2, the connections c and d designate the connection points to the filaments of the fluorescent lamps LL1 and LL2.
  • connection c and d of the control circuit 5 assigned to the lamp filaments are brought together in a coupling point via series resistors R1 and R2, that is to say connected in parallel.
  • Analogue the lamp chokes DR1 and DR2 are connected in parallel via a varistor R3 and R4 to a further coupling point.
  • Both coupling points are connected via two further resistors R5 and R6 to a rectifier network connected to ground, consisting of the parallel connection of a first diode D1, a smoothing capacitor C1 and a further resistor R7.
  • the monitoring circuit 4 is indicated in FIG. 2 for clarification. It is connected via connections e and f on the one hand to the coupling point of the two series resistors R1 and R2 and on the other hand to the connection point of the two further resistors R5 and R6.
  • the monitoring circuit 4 as indicated schematically, has a double function. It supplies a regulated potential via the connection e as a starting condition for the lamp circuits. Via the connection f, on the other hand, a potential is tapped which is proportional to the voltage applied to the lamp circuits. As long as the ignition voltage is present, a timing element, not shown, usually an RC element, is charged in the monitoring circuit 4.
  • connection point of the resistor R5 with the coupling point of the series resistors R1 and R2 is connected via a high-impedance coupling resistor R8 to the connection point of two further diodes D2 and D3 in series.
  • a second capacitor C2 and a further resistor R9 are connected in parallel with these diodes.
  • the diodes D2, D3 have a rectifier function for the alternating current injected via the coupling resistor, the further capacitor C2 assumes a smoothing function.
  • a Zener diode D4 and a further resistor R10 are connected and connected to a circuit point g.
  • This circuit point g is connected to ground on the one hand via a further RC element, consisting of the parallel connection of a further resistor R11 and a further capacitor C3.
  • the circuit point g is connected to the anode of a further diode D5, which is cathode-coupled in series with a further Z-diode D6.
  • the first transistor V1 is connected to ground on the emitter side and is connected to the collector point g via a series connection of two further resistors R12 and R13. Its base is connected to the anode of the further Z diode D6.
  • the base of the second transistor V2 on the emitter side at the circuit point g is connected to the connection point of the two further resistors R12 and R13 in the collector path of the first transistor V1.
  • the second transistor V2 is connected on the collector side to the base of the first transistor V1 via a further resistor R14 and is connected in series to this via a further resistor R15 to ground.
  • the collector of the second transistor V2 is connected to ground via a further resistor R16, to which a further Z diode D7 is connected in parallel.
  • a field-effect transistor V3 is provided as a further switching element, the gate electrode of which is connected to the collector of the second transistor V2, the source electrode of which is connected to ground and the drain electrode of which is connected to the winding a switching relay RE is connected.
  • Another Z diode D8 for voltage limitation is connected in parallel with this winding.
  • the relay coil is connected to the output of the inverter 3 via a diode / capacitor network. This network, as a voltage generator, converts the output voltage uhb of the inverter 3 into a smoothed DC voltage, which forms the operating voltage for the switching relay RE.
  • FIG. 2 an embodiment of the switch S1 is indicated in FIG. 2, which in this case has two changeover contacts s1, s2.
  • the connection contacts k1, k2 and k3 correspond to the connection contacts specified in the embodiment according to FIG. 1, so that the same switching function results from the series connection that was described above.
  • the series connection of two relay contacts takes into account the conditions due to a high ignition voltage.
  • a further connection contact k4 of the second switching element is connected to a clamp network consisting of two further diodes and connected to the output of the step-up converter 2. In this way, the potential between the contact terminals k2 and k1, d. H. between the second lamp inductor DR2 and the second fluorescent lamp LL2 limited to an allowable value.
  • the timing element of the monitoring circuit 4 is charged to a certain value. Because of the selected time conditions, however, the monitoring circuit 4 cannot yet respond. Because the capacitor C3 of the timing element of the control circuit 5 is also charged at the same time, the potential at the circuit point g increases until the response threshold for the diode network D5 and D6 is reached. Then the Zener diode D6 breaks down and triggers the trigger circuit. That is, First, the first transistor V1 is turned on by the control current carried by the switching point g via the diode network D5, D6 and the bleeder resistor R15.
  • the potential at the base of the second transistor V2 is thus pulled down due to the action of the voltage divider R12 and R13, so that the second transistor also opens.
  • the flip-flop holds itself in this state via the voltage divider formed from the further resistors R14 and R15 and assigned to the base of the first transistor V1.
  • the voltage at the gate electrode of the field effect transistor V3 increases to a predetermined value due to the voltage drop across the resistor R16 in the collector circuit of the second transistor V2.
  • This predetermined value which is determined by the breakdown voltage of the further Z-diode D7, is selected such that the field effect transistor V3 is also turned on when the flip-flop is switched on.
  • the coil current thus flows through the relay RE, which switches the switch S1.
  • the circuit arrangement according to FIG. 1 is thus in a circuit state for 1-lamp operation without the monitoring circuit 4 responding. This is because, due to the lower response threshold of the control circuit 5, the processes described already run before the monitoring circuit 4 can respond.
  • the switch S1 is first switched over, as described. Because of the still pending high ignition voltage, the timer of the monitoring circuit 4 is further charged. In addition, after the response time t2 defined for the monitoring circuit 4 has elapsed, it also responds and shuts down the inverter 3. In this case, the output voltage at the inverter 3 breaks down, the voltage generator for the relay supplied via it is thus deactivated and the switch S1 falls back into its rest position. In addition, the flip-flop, consisting of transistors V1 and V2, resets itself. After changing both fluorescent lamps LL1 and LL2, the electronic ballast can then be started normally again.
  • the control circuit is triggered as described above and the switch S1 switches over to its working position.
  • the circuit arrangement shown in FIG. 1 works for all other causes of error, except in the event of a filament breakage of the deactivated lamp, it being possible for the voltage applied to the series resonant circuit thus formed to continue to be monitored as the operating voltage.
  • the holding current of the control circuit 5 is halved. This has an effect on the control circuit 5 in such a way that the Zener diode D4 arranged in the holding circuit of the flip-flop resets itself.
  • the potential at the switching point g thus continues to decrease, so that the trigger circuit formed from the transistors V1, V2 also resets.
  • the switch S1 is also switched to its rest position shown in FIG. 1. After the lamp change, normal operation of the two fluorescent lamps LL1 and LL2 is possible again.
  • the basic idea described can also be extended to arrangements in which a plurality of fluorescent lamps are operated with a single electronic ballast. This is shown in FIG. 3 using a further example in which three fluorescent lamps LL1, LL2 and LL3 are assigned to one ballast.
  • the basic circuit diagram according to FIG. 3 is adapted to the block diagram of FIG. 1. It is understandable from the above explanation.
  • the circuit arrangement for the lamp circuits of the two fluorescent lamps LL1 and LL2 is identical to the circuit diagram according to FIG. 1.
  • a third lamp circuit with a further lamp inductor DR3, a further switch S2 and the third fluorescent lamp LL3 with a parallel ignition capacitor CZ3 is provided.
  • the second switch S2 also has a changeover contact s which, in the idle position, connects the third lamp inductor DR3 to the associated third fluorescent lamp LL3.
  • the switch S2 is actuated via a control circuit 5 'in the event of a fault, and the third fluorescent lamp LL3 is thus - as before - connected to the output of the first lamp inductor DR1.
  • Both control circuits 5 and 5 'work - as explained with reference to Figure 2 - with the monitoring circuit 4. With this circuit arrangement, a criterion can therefore be detected for which fluorescent lamp has failed.
  • the exemplary embodiments described illustrate various options for maintaining the operation of intact lamps with an electronic ballast even with a defective fluorescent lamp.
  • further configurations are conceivable.
  • relay-controlled switches are used, for example. But the person skilled in the art is familiar with the fact that a comparable switching function could also be achieved by electronic switches.

Claims (10)

  1. Circuit pour le fonctionnement d'au moins deux lampes fluorescentes (LL1, LL2) utilisant un ballast électronique (1, 2, 3) aux sorties duquel les lampes fluorescentes sont reliées, d'une part chacune par l'intermédiaire d'une self de lampe respective (DR1, DR2) et d'autre part, par l'intermédiaire d'un condensateur à demi-pont (CHB) commun, caractérisé en ce qu'un dispositif de commutation (S1, 5) situé entre les selfs de lampe et les lampes fluorescentes est prévu, grâce auquel les circuits des lampes peuvent être connectés de manière commune à une seule des selfs de lampe en fonction d'un état de défaut à l'occasion duquel une tension d'allumage est appliquée à une des lampes fluorescentes pendant une durée supérieure à un intervalle de temps prédéterminé (t1).
  2. Circuit selon la revendication 1, caractérisé en ce que le dispositif de commutation (S1, 5; S2, 5') est exécuté de façon à pouvoir se remettre à l'état initial, de manière à ce que, lors du changement de la lampe fluorescente défectueuse, il puisse se désactiver lui-même et revenir à sa position de repos.
  3. Circuit selon l'une des revendications 1 ou 2, dans lequel un circuit de contrôle (4) relié au ballast électronique (1, 2, 3) est connecté aux circuits de lampes, circuit de contrôle qui, commandé par le ballast électronique, déclenche le processus d'allumage lors de la mise sous tension des lampes fluorescentes (LL1, LL2) et possède un relais de temporisation pour contrôler le processus d'allumage dans les limites d'un autre intervalle de temps prédéterminé (t2), et qui désactive le ballast électronique lorsque la tension établie aux bornes du relais de temporisation indique un dépassement de cet intervalle de temps prédéterminé, caractérisé en ce que l'intervalle de temps (t1) prédéterminé comme temps de réaction pour le dispositif de commutation (S1, 5) est inférieur à l'autre intervalle de temps (t2) prédéterminé comme temps de réaction pour le circuit de contrôle (4).
  4. Circuit selon l'une des revendications 1 à 3, caractérisé en ce que le dispositif de commutation est formé par au moins un élément de commutation (S1, S2) situé dans les circuits de lampes et par un circuit de commande (5 resp. 5') associé à celui-ci individuellement et couplé aux circuits de lampes pour détecter leur tension d'allumage, lequel circuit de commande comprend une unité de commande (V1, V2, V3, RE) actionnant l'élément de commutation (S1 resp. S2), dont le circuit d'entrée est exécuté en tant que relais de temporisation (R10, R11, C3) supplémentaire dont le seuil de déclenchement activant l'unité de commande est dépassé dès que la tension d'allumage est appliquée à une des lampes fluorescentes contrôlées (par exemple LL1, LL2) pendant une durée supérieure à l'intervalle de temps prédéterminé (t1).
  5. Circuit selon la revendication 4, dans lequel plusieurs lampes fluorescentes (LL1, LL2, LL3) sont connectées au ballast électronique (1, 2, 3), caractérisé en ce qu'un seul et même circuit de lampes (LL1, CZ1) forme respectivement avec un des circuits de lampes restants (LL2, CZ2 resp. LL3, CZ3) une paire de circuits de lampes par permutation cyclique, et en ce que, pour chacune de ces paires, un élément de commutation individuel (S1 resp. S2) et un circuit de commande respectif (5 resp. 5') associé individuellement aux éléments de commutation sont prévus, et les éléments de commutation sont situés dans les circuits de lampes de manière à ce que, en cas de panne, les deux circuits de lampes puissent toujours être connectés à une seule et même self de lampe (DR1) grâce à l'élément de commutation respectif (S1 ou S2).
  6. Circuit selon l'une des revendications 4 ou 5, caractérisé en ce que, dans le dispositif de commutation (S1, 5), l'élément de commutation (S1) est exécuté en tant que commutateur va-et-vient commandé par relais et, dans le circuit de commande (5), un relais (RE) est prévu en tant qu'élément de commande, lequel relais est monté en série, dans un circuit d'alimentation, avec un étage de commutation (V1, V2, V3) qui est couplé aux circuits de lampes par l'intermédiaire de l'autre relais de temporisation (R10, R11, C3) déterminant le temps de réaction du circuit de commande ainsi que d'un réseau de couplage (R8, D2, D3).
  7. Circuit selon la revendication 6, caractérisé en ce que l'étage de commutation (V1, V2, V3) comprend un montage en bascule se maintenant lui-même, formé par une paire de transistors (V1, V2), qui, pour amener un courant de commande et, de cette manière, déclencher le processus de bascule, est relié indirectement à l'autre relais de temporisation (R10, R11, C3) par l'intermédiaire d'une ligne de diodes (D5, D6) déterminant son seuil de réponse, et pour amener un courant de maintien dans l'état basculé, est relié directement à cet autre relais de temporisation (R10, R11, C3), et en ce que, dans l'étage de commutation est prévu un autre transistor (V3) qui est avec sa longueur de coupure monté en série avec le relais (RE), transistor dont l'entrée de commande est reliée au circuit de sortie du montage en bascule.
  8. Circuit selon la revendication 7, caractérisé en ce que la ligne de diodes associée à l'entrée de commande du montage en bascule (V1, V2) comprend une diode de redressement (D5) ainsi qu'une diode de Zener (D6) dont la tension de claquage détermine le seuil de réponse du montage en bascule, reliées par leur cathode.
  9. Circuit selon l'une des revendications 6 à 8, caractérisé en ce que le réseau de couplage comprend un montage parallèle mis à la masse unilatéralement, formé par un redresseur en demi-pont (D2, D3) avec un point d'alimentation, un condensateur de filtrage (C2) et une résistance réductrice de tension (R9), et comprend, en outre, une résistance de couplage (R8) de valeur ohmique élevée qui est située entre le point d'alimentation du redresseur en demi-pont et les circuits de lampes contrôlés en parallèle, et en ce que, en outre, l'autre relais de temporisation (R10, R11, C3) du circuit de commande (5) est connecté au point de jonction non mis à la masse du circuit parallèle par l'intermédiaire d'une autre diode de Zener (D4) qui, lorsque le circuit de commande est préalablement activé dans le cas du retrait d'une lampe fluorescente défectueuse des circuits de lampes contrôlés, se bloque à cause d'un courant de maintien des lampes qui diminue, et remet ainsi le montage en bascule (V1, V2) à l'état initial.
  10. Circuit selon l'une des revendications 7 à 9, caractérisé en ce qu'une diode supplémentaire (D7) est située dans le circuit de commande d'entrée de l'autre transistor (V3) de l'étage de commutation (V1, V2, V3) pour limiter le courant et une diode supplémentaire (D8) est montée en parallèle à l'enroulement du relais (RE) pour limiter la tension aux bornes du relais, et en ce que l'élément de commutation (S1, S2) est pourvu de deux contacts inverseurs montés en série qui, à l'état de repos de l'élément de commutation, relient ce circuit de lampes (par exemple LL2, CZ2) à la self de lampe correspondante (DR2) qui, dans l'état de commutation activé de l'élément de commutation, est coupée du circuit de lampes correspondant.
EP92103567A 1992-03-02 1992-03-02 Circuit pour le fonctionnement de plusieurs lampes fluorescentes avec un ballast Expired - Lifetime EP0558772B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT92103567T ATE143208T1 (de) 1992-03-02 1992-03-02 Schaltungsanordnung zum betreiben mehrerer leuchtstofflampen mit einem vorschaltgerät
DE59207186T DE59207186D1 (de) 1992-03-02 1992-03-02 Schaltungsanordnung zum Betreiben mehrerer Leuchtstofflampen mit einem Vorschaltgerät
EP92103567A EP0558772B1 (fr) 1992-03-02 1992-03-02 Circuit pour le fonctionnement de plusieurs lampes fluorescentes avec un ballast

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Application Number Priority Date Filing Date Title
EP92103567A EP0558772B1 (fr) 1992-03-02 1992-03-02 Circuit pour le fonctionnement de plusieurs lampes fluorescentes avec un ballast

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EP0558772A1 EP0558772A1 (fr) 1993-09-08
EP0558772B1 true EP0558772B1 (fr) 1996-09-18

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DE (1) DE59207186D1 (fr)

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Publication number Priority date Publication date Assignee Title
TW266383B (en) * 1994-07-19 1995-12-21 Siemens Ag Method of starting at least one fluorescent lamp by an electronic ballast and the electronic ballast used therefor
DE59506476D1 (de) 1995-05-31 1999-09-02 Siemens Ag Schaltungsanordnung zum Überwachen des Lampenbetriebs mindestens zweier Leuchtstofflampen
DE19816815C1 (de) * 1998-04-16 1999-11-11 Vossloh Schwabe Gmbh Vorschaltgerät zum Betrieb einer Mehrzahl von Entladungslampen
FI106426B (fi) 1999-03-31 2001-01-31 Innoware Oy Loistelamppujen liitäntälaite
FI112773B (fi) * 2002-04-30 2003-12-31 Teknoware Oy Menetelmä ja järjestely liitäntälaitteen yhteydessä sekä liitäntälaite

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EP0146683B1 (fr) * 1981-07-31 1987-11-19 Siemens Aktiengesellschaft Onduleur
DE3247863A1 (de) * 1982-12-23 1984-06-28 Siemens AG, 1000 Berlin und 8000 München Anordnung zur abschaltung eines wechselrichters
DE3608615A1 (de) * 1986-03-14 1987-09-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb von niederdruckentladungslampen

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Publication number Publication date
EP0558772A1 (fr) 1993-09-08
DE59207186D1 (de) 1996-10-24
ATE143208T1 (de) 1996-10-15

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