EP1961277B1 - Circuit arrangement and method for the operation of at least one first and a second lamp - Google Patents

Circuit arrangement and method for the operation of at least one first and a second lamp Download PDF

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Publication number
EP1961277B1
EP1961277B1 EP06830350A EP06830350A EP1961277B1 EP 1961277 B1 EP1961277 B1 EP 1961277B1 EP 06830350 A EP06830350 A EP 06830350A EP 06830350 A EP06830350 A EP 06830350A EP 1961277 B1 EP1961277 B1 EP 1961277B1
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EP
European Patent Office
Prior art keywords
lamp
terminal
coil electrode
coupled
electrode
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EP06830350A
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German (de)
French (fr)
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EP1961277A1 (en
Inventor
Werner Longhino
Andreas Mitze
Thomas Mudra
Markus Ziegler
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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
    • 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
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the present invention relates to a circuit arrangement for operating at least a first and a second lamp, wherein the first and the second lamp each have a first and a second filament electrode, with a first and a second terminal for the first filament electrode of the first lamp, a first and a second a second terminal for the second filament electrode of the first lamp, first and second terminals for the first filament electrode of the second lamp, first and second terminals for the second filament electrode of the second lamp, at least one supply terminal for supplying a supply voltage to the first one Helical electrode of the at least one first and second lamp and at least one preheating device for the respective first helical electrode of the at least one first and second lamp, wherein the second terminal of the first helical electrode of the first lamp to the second terminal of the first helical electrode the second lamp is coupled.
  • the invention also relates to a corresponding method of operation for at least one first and one second lamp, each having a first and a second filament electrode.
  • the problem addressed by the present invention resides in helical electrode detection multi-lamp ballasts. This is to ensure that when applied input voltage, the ballast is released only when the last coil electrode is contacted in the socket. A release before this time would involve the risk that the full ignition voltage could be transmitted to an operator. In addition to the complete filament electrode detection, however, the requirements of the filament electrodes during pre-heating and continuous heating must be observed at the same time. From the prior art, no optimal solutions to this problem are known. The previous approaches involve either a parallel connection, see Fig. 1 , or a series connection, see Fig. 2 , the helical electrodes. In the Fig. 1 The circuit arrangement shown has a first lamp Lp1 and a second lamp Lp2.
  • the first lamp Lp1 has a first filament electrode W1 with a first terminal A1 and a second terminal A2 and a second filament electrode W2 with a first terminal A1 and a second terminal A2.
  • the second lamp Lp2 has a first coil electrode W1 and a second coil electrode W2.
  • the first helical electrode W1 comprises a first terminal A1 and a second terminal A2.
  • the second coil electrode W2 includes a first terminal A1 and a second terminal A2. Via a resistor R1, a supply voltage Uv is applied to a point at which the terminal A1 of the coil electrode W1 of the first lamp Lp1 is coupled to the terminal A1 of the coil electrode W1 of the second lamp Lp2.
  • connection point of the terminal A2 of the coil electrode W1 of the first lamp Lp1 to the terminal A2 of the coil electrode W1 of the second lamp Lp2 is via the series connection of a heating coil L1 and a diode D1 on the one hand connected to the resistor R1, so that there is a parallel connection of the two first helical electrodes W1.
  • this point is coupled via a resistor R2 to an evaluation unit AW1.
  • the evaluation AW1 receives a signal as soon as one of the first coil electrodes W1 is inserted.
  • Fig. 2 showing a series connection of the lamps Lp1 and Lp2, and for the as well as for the following figures associated with Fig. 1 introduced reference numerals for the same and similar components, although allows the Wendelelektrodendetetation, but studies have shown that by the series connection of each first coil electrode W1, which have different filament electrode resistances in practice, they black after a short time in the dimmed state.
  • DE 69 916 251 T2 discloses an electronic ballast for operating a group of gas discharge lamps.
  • the object of the present invention is therefore to further develop the circuit arrangement mentioned at the outset or the method mentioned at the outset such that a reliable filament electrode detection without the undesired consequence of blackening of the filament electrodes in the dimmed state is made possible.
  • the present invention is based on the realization that this object can be achieved by a clever combination of series and parallel connection.
  • the latter is made possible by providing two preheaters, the junction of the two preheaters being additionally connected by a center tap to the respective second terminal of the first filament electrode of each lamp.
  • the first connection of the first coil electrode of the first lamp and the first connection of the first coil electrode of the second lamp are preferably coupled to the supply connection.
  • the first preheater is coupled to the first terminal of the first filament electrode of the first lamp and the second preheater to the first terminal of the first filament electrode of the second lamp.
  • a first diode in the flow direction is coupled between the first preheater and the first terminal of the first filament of the first lamp and between the second preheater and the first terminal of the first filament of the second lamp, a second diode is coupled in the flow direction.
  • the coupling of the second terminal of the first filament electrode of the first lamp to the second terminal of the first filament electrode of the second lamp is preferably coupled to an evaluation device.
  • such a circuit arrangement preferably has a first and a second terminal for the first filament electrode of a third lamp and a first and a second terminal for the second filament electrode of the third lamp, wherein the first terminal for the first filament electrode of the third lamp is coupled to the supply terminal wherein the second terminal for the first filament electrode of the third lamp is coupled to an evaluation device, wherein the first terminal for the second filament electrode of the third lamp is coupled to the first terminal of the second filament electrode of the first lamp and wherein the second terminal for the second Coil electrode of the third lamp is coupled to an evaluation device.
  • the circuit arrangement comprises a first and a second terminal for a first filament electrode of a third lamp, a first and a second terminal for a second filament electrode of the third lamp, a first and a second terminal for a first filament electrode fourth lamp and a first and a second terminal for a second filament electrode of the fourth lamp.
  • the at least one supply connection is furthermore designed to supply a supply voltage to the respective first coil electrode of the third and the fourth lamp, the second connection of the first coil electrode of the third lamp to a second connection of the first coil electrode of the fourth coil
  • the preheating device further comprises a third preheating inductance and a fourth preheating inductance arranged in series with each other, wherein the coupling of the third and fourth preheating inductances to the coupling of the second terminal of the first filament electrode of the third lamp and the second terminal of the first filament electrode the fourth lamp is coupled.
  • the first and the second lamp can also be connected in such a way that the coupling of the second terminal of the first filament electrode of the first lamp to the second terminal of the first filament electrode of the second lamp is coupled to the supply terminal.
  • preferred circuit arrangements which correspond to those in which the first terminal of the first filament electrode of the first lamp and the first terminal of the first filament electrode of the second lamp are coupled to the supply terminal, and the preferred embodiments mentioned in this context, see above ,
  • the first preheater is coupled to the first terminal of the first filament electrode of the first lamp and the second preheater is coupled to the first terminal of the first filament electrode of the second lamp, between the first terminal of the first filament electrode of the first lamp and the first Preheating a third diode is coupled in the flow direction and wherein between the first terminal of the first coil electrode of the second lamp and the second preheater, a fourth diode is coupled in the flow direction.
  • a preferred circuit arrangement with more than two lamps results in that the circuit arrangement has a first and a second terminal for the first filament electrode of a third lamp and a first and a second terminal for the second filament electrode of the third lamp, wherein the first terminal for the first filament electrode of the third lamp is coupled to an evaluation device, wherein the second terminal for the first filament electrode of the third lamp is coupled to the supply terminal, wherein the first terminal for the second filament electrode of the third lamp is coupled to the first terminal of the second filament electrode of the first lamp and wherein the zw Connection for the second filament electrode of the third lamp is coupled to the supply terminal.
  • FIGS. 3 to 8 illustrated embodiments of a circuit arrangement according to the invention and not explained again. Insofar, in the following, only the differences to those in the Figures 1 and 2 presented, known circuit arrangements received.
  • the preheater includes a first preheat inductor L11 and a second preheat inductor L12.
  • the preheating inductance L11 is connected via a diode D11 in the flow direction to the first terminal A1 of the first filament electrode W1 of the first lamp Lp1, while the second preheating inductance L12 via a second diode D12 in the flow direction to the first terminal A1 of the first filament electrode W1 of the second lamp Lp2 connected is.
  • connection point between the second terminal A2 of the first coil electrode W1 of the first lamp Lp1 and the second terminal A2 of the second coil electrode W2 of the second lamp Lp2 is connected on the one hand via a resistor R2 to a terminal P7 of the evaluation unit AW1, on the other hand in the manner of a center tap with the Connection point between the first preheating inductance L11 and the second preheating inductance L12.
  • the center tap is necessary so that a parallel connection of each first coil electrode W1 can be ensured during the pre-heating or continuous heating, whereby a black coloration of one of the coil electrodes due to different coil electrode resistance can be prevented.
  • both the first terminal A1 of the first coil electrode W1 of the first lamp Lp1 is connected to the power supply Uv and the first terminal A1 of the first coil electrode W1 of the second lamp Lp2, a reliable filament electrode detection is possible at the evaluation unit AW1:
  • the evaluation unit AW1 finds a summation of the proportion, which results from the lamp Lp1, as well as the proportion, which results from the lamp Lp2 instead.
  • an evaluation takes place on the basis of different supply voltages Uv in analog form. For pre- and / or.
  • an inductance L21 and a diode D21 is provided, wherein the terminal A1 is connected via an inductance L D with the half-bridge center H B , a half-bridge circuit.
  • the terminal A2 of the coil W2 of the lamp Lp2 is connected via a resistor R8 to the supply voltage Uv.
  • an inductance L22 and a diode D22 is provided.
  • the signal at the output A1 is fed via a resistor R7 to the terminal P6 of the evaluation unit AW1.
  • the primary windings to the inductors L21, L22, L11 and L12 are not shown for reasons of clarity.
  • an actual value detection of the lamp current of the lamp Lp2 is performed at the input P2 of the evaluation unit AW1.
  • the supply voltage connections which are identified uniformly by Uv, may be connected to supply voltages Uv of different amplitudes, where appropriate for evaluation by the evaluation unit. The latter applies to everyone in the FIGS. 4 to 8 illustrated embodiments.
  • Fig. 3a is fragmentary an alternative variant to the embodiment according to Fig. 3 shown.
  • Fig. 3a reversed the polarity of diode D11.
  • resistors R12 and R11 there is no DC path for a current passing through resistors R12 and R11 and only one of the coils W1 of lamps Lp1 and Lp2.
  • the resistor R12 is connected via the connection P3a to the evaluation unit.
  • the evaluation unit does not need to interrogate the two coils W1 of the lamps Lp1 and Lp2 via different amplitudes at the connection P3a. Rather, a simple test is sufficient if a DC voltage is available is or not. This not only reduces the effort for the helical scan, but also increases the reliability of the query. Furthermore, in the variant Fig. 3a across from Fig. 3 the connection P7 and the associated resistor R2 are omitted. This advantageously simplifies the topology of the circuit arrangement.
  • Fig. 3a is also the winding sense of the inductance L11 reversed; However, this has no effect on the Wendeldetetation as it is the subject of the present invention.
  • the Wicklungsinn of the inductors is arbitrary.
  • connection point between the second terminal A2 of the first coil electrode W1 of the first lamp Lp3 and the second terminal A2 of the first coil electrode W1 of the second lamp Lp4 is connected to the supply voltage Uv via a resistor R1.
  • the first terminal A1 of the first coil electrode W1 of the first lamp Lp3 is connected via a resistor R21 to the input P1 of the evaluation unit AW1, the first terminal A1 of the first coil electrode W1 of the second lamp Lp4 via a resistor R22 to the input P4 of the evaluation AW1.
  • the first terminal A1 of the first coil electrode W1 of the first lamp Lp3 is connected via a diode D13 to a first preheating inductance L13, while the first terminal A1 of the first coil electrode W1 of the second lamp Lp4 is connected via a diode D14 to a second preheating inductance L14.
  • the connection point of the two Vorholicindukturgien L13 and L14 is connected via a center tap to the connection point of the terminals A2 of the first coil W1 of the first lamp Lp3 and A2 of the first coil electrode W1 of the second lamp Lp4.
  • a parallel connection of the two first coil electrodes W1 is again enabled in the preheating or continuous heating mode, while a coil electrode detection is made possible via the signals supplied to the evaluation unit AW1 at their inputs.
  • the diode D23 and the inductor L23 serve to pre-heat the second filament W2 of the first lamp Lp3, while the diode D24 and the inductor L24 serve to preheat the second filament electrode W2 of the second lamp Lp4.
  • the function of the elements R6, P5, R9, C32, D31 and D32 corresponds to the function of the elements R7, P6, R8, C31, D32, D31 in the embodiment of FIG Fig. 3 ,
  • the Fig. 5 represents a further education of in Fig. 3 in the form of a variant with three lamps Lp1, Lp2, Lp6.
  • first of all the connection A2 of the second filament W2 of the lamp Lp1 is connected to the supply connection Uv via a resistor R4.
  • the third lamp Lp6 has a first coil W1 with a first and a second terminal A1, A2 and a second coil W2 with a first and a second terminal A1, A2 on.
  • the terminal A1 of the second filament W2 of the lamp Lp6 is connected to the terminal A1 of the second filament W2 of the lamp Lp1.
  • the terminal A2 of the second filament W2 of the lamp Lp6 is connected via a resistor R3 to the terminal P0 of the evaluation unit.
  • the terminal A2 of the filament W1 of the lamp Lp6 is connected via a resistor R6 to the terminal P5 of the evaluation unit.
  • the terminal A1 of the filament W1 of the lamp Lp6 is connected to the supply terminal Uv via a resistor R9.
  • An inductor L23 and a diode D23 connected in series therewith as well as an inductance L24 and a diode D24 connected in series serve again for the pre-heating or continuous heating of the associated filaments.
  • the circuit arrangement furthermore has a balancing transformer which comprises the inductors L31 and L32.
  • the half-bridge coupling capacitors C31 and C32 are arranged in series with these two inductors L31, L32.
  • the coupling capacitor C32 is connected via a diode D32 to ground, the coupling capacitor C31 is connected via a diode D31 to the terminal P2 of the evaluation unit for actual value detection of the lamp current.
  • Fig. 6 illustrated embodiment is a development of in Fig. 4
  • the use of three lamps Lp3, Lp4, Lp5, but the lamps Lp3, Lp4 of the circuit with respect to the arrangement in Fig. 4 are shown mirrored.
  • the terminal of the evaluation unit at which the terminal A1 of the second filament W2 of the lamp Lp4 is evaluated, is designated P5.
  • the terminal A1 becomes the filament W2 of the lamp Lp3 fed via a resistor R4 the input P0 of the evaluation.
  • the Fig. 6 illustrated embodiment has with respect to the embodiment of Fig. 4 another lamp Lp5 on.
  • the terminal 1 of the filament W1 of the lamp Lp5 is connected to the input P6 of the evaluation unit via a resistor R7, and the terminal A2 of the filament W1 of the lamp Lp5 is connected to the supply voltage Uv via a resistor R8.
  • the terminal A1 of the filament W2 of the lamp Lp5 is connected to the terminal A2 of the filament W2 of the lamp Lp3.
  • the terminal A2 of the filament W2 of the lamp Lp5 is connected via a resistor R4 to the supply voltage Uv.
  • the function of elements C31, C32, D31, D32, L31, L32 corresponds to that of Fig. 5 ,
  • Fig. 7 illustrated embodiment corresponds to a combination of the left two lamps Lp1, Lp2 according to the embodiment of Fig. 5 and the right two lamps Lp3, Lp4 of the embodiment of FIG Fig. 6 ,
  • the fact that the circuit at the two terminals A1, A2 of a helix W1 or W2 in the embodiment of Fig. 7 compared to the embodiments of Fig. 5 or Fig. 6 As is obvious to the person skilled in the art, it has no significance for the evaluation.
  • Fig. 8 shows an embodiment with six lamps Lp1, Lp2, Lp3, Lp4, Lp6, Lp6, wherein the embodiment according to Fig. 8 composed of the embodiment of Fig. 5 of which the lamps Lp1, Lp2 and Lp6 have been adopted, as well as the embodiment of FIG Fig. 6 from which the lamps Lp3, Lp4 and Lp5 have been adopted.
  • the inductors L11, L12, L13 and L14 form the secondary windings of a first heating transformer, while the inductors L21, L22, L23 and L24 form the secondary windings to form a second heating transformer.
  • the inputs P0, P1 and P4, if present, are connected to digital inputs of a microprocessor of the evaluation unit AW1, while the inputs P5, P6 and P7 are connected to analog inputs of a microprocessor of the evaluation unit AW1. If the filament electrode W2 of the lamp Lp1 and the filament electrode W2 of the lamp Lp3 are inserted, a digital "1" is present at the input P0, otherwise a "0". The same applies to the helical electrodes W1 of the lamp Lp4 and W1 of the lamp Lp3, which are monitored at the inputs P1 and P4. At the input P7 can be determined whether the helical electrodes W1 and W2 of the lamp Lp1 are used.
  • the input P5 it can be determined whether the filament electrodes W2 of the lamp Lp4 or W1 of the lamp Lp6 are inserted.
  • the input P6 it can be determined whether the filament electrodes W2 of the lamp Lp2 or W1 of the lamp Lp5 are inserted.
  • the input P2 is, as already mentioned, the detection of the actual value of the lamp current for a control device, not shown.
  • the above-mentioned continuous heating of the helical electrodes is particularly considered when dimming the lamps to prevent blackening of the helical electrodes.

Abstract

A circuit arrangement for operating at least one first and second lamp each provided with a first and second coil electrode includes a first and second terminal for the first coil electrode of the first lamp, a first and second terminal for the second coil electrode of the first lamp, a first and second terminal for the first coil electrode of the second lamp, a first and second terminal for the second coil electrode of the second lamp, at least one supply connection for supplying voltage to the respective first coil electrode of the at least one first and second lamp, and at least one preheating device for the respective first coil electrode of the at least one first and second lamp. The second terminal of the first coil electrode of the first lamp is coupled to the second terminal of the first coil electrode of the second lamp while the preheating device encompasses a first preheating inductor and a second preheating inductor.

Description

Technisches GebietTechnical area

Die vorliegende Erfindung betrifft eine Schaltungsanordnung zum Betreiben mindestens einer ersten und einer zweiten Lampe, wobei die erste und die zweite Lampe jeweils eine erste und eine zweite Wendelelektrode aufweisen, mit einem ersten und einem zweiten Anschluss für die erste Wendelelektrode der ersten Lampe, einem ersten und einem zweiten Anschluss für die zweite Wendelelektrode der ersten Lampe, einem ersten und einem zweiten Anschluss für die erste Wendelelektrode der zweiten Lampe, einem ersten und einem zweiten Anschluss für die zweite Wendelelektrode der zweiten Lampe, mindestens einem Versorgungsanschluss zum Zuführen einer Versorgungsspannung an die jeweils erste Wendelelektrode der mindestens einen ersten und zweiten Lampe und mindestens einer Vorheizvorrichtung für die jeweils erste Wendelelektrode der mindestens einen ersten und zweiten Lampe, wobei der zweite Anschluss der ersten Wendelelektrode der ersten Lampe an den zweiten Anschluss der ersten Wendelelektrode der zweiten Lampe gekoppelt ist. Die Erfindung betrifft überdies ein entsprechendes Betriebsverfahren für mindestens eine erste und eine zweite Lampe, die jeweils eine erste und eine zweite Wendelelektrode aufweisen.The present invention relates to a circuit arrangement for operating at least a first and a second lamp, wherein the first and the second lamp each have a first and a second filament electrode, with a first and a second terminal for the first filament electrode of the first lamp, a first and a second a second terminal for the second filament electrode of the first lamp, first and second terminals for the first filament electrode of the second lamp, first and second terminals for the second filament electrode of the second lamp, at least one supply terminal for supplying a supply voltage to the first one Helical electrode of the at least one first and second lamp and at least one preheating device for the respective first helical electrode of the at least one first and second lamp, wherein the second terminal of the first helical electrode of the first lamp to the second terminal of the first helical electrode the second lamp is coupled. The invention also relates to a corresponding method of operation for at least one first and one second lamp, each having a first and a second filament electrode.

Stand der TechnikState of the art

Die Problematik, mit der sich die vorliegende Erfindung befasst, besteht in der Wendelelektrodendetektion bei mehrlampigen Vorschaltgeräten. Dadurch soll gewährleistet werden, dass bei anliegender Eingangsspannung das Vorschaltgerät erst freigegeben wird, wenn die letzte Wendelelektrode im Sockel kontaktiert ist. Eine Freigabe vor diesem Zeitpunkt würde die Gefahr mit sich bringen, dass die volle Zündspannung an eine Bedienperson übertragen werden könnte. Neben der kompletten Wendelelektrodendetektion müssen allerdings zugleich die Anforderungen der Wendelelektroden beim Vor- und Dauerheizen eingehalten werden. Aus dem Stand der Technik sind keine optimalen Lösungen dieser Problematik bekannt. Die bisherigen Ansätze beinhalten entweder eine Parallelschaltung, siehe Fig. 1, oder eine Reihenschaltung, siehe Fig. 2, der Wendelelektroden. Die in Fig. 1 dargestellte Schaltungsanordnung weist eine erste Lampe Lp1 und eine zweite Lampe Lp2 auf. Die erste Lampe Lp1 weist eine erste Wendelelektrode W1 mit einem ersten Anschluss A1 und einem zweiten Anschluss A2 auf sowie eine zweite Wendelelektrode W2 mit einem ersten Anschluss A1 und einem zweiten Anschluss A2. Die zweite Lampe Lp2 weist eine erste Wendelelektrode W1 und eine zweite Wendelelektrode W2 auf. Die erste Wendelelektrode W1 umfasst einen ersten Anschluss A1 sowie einen zweiten Anschluss A2. Die zweite Wendelelektrode W2 umfasst einen ersten Anschluss A1 und einen zweiten Anschluss A2. Über einen Widerstand R1 wird eine Versorgungsspannung Uv an einen Punkt angelegt, an dem der Anschluss A1 der Wendelelektrode W1 der ersten Lampe Lp1 mit dem Anschluss A1 der Wendelelektrode W1 der zweiten Lampe Lp2 gekoppelt ist. Der Verbindungspunkt des Anschlusses A2 der Wendelelektrode W1 der ersten Lampe Lp1 mit dem Anschluss A2 der Wendelelektrode W1 der zweiten Lampe Lp2 ist über die Serienschaltung einer Heizwicklung L1 und einer Diode D1 einerseits mit dem Widerstand R1 verbunden, so dass sich eine Parallelschaltung der beiden ersten Wendelelektroden W1 ergibt. Zum anderen ist dieser Punkt über einen Widerstand R2 an eine Auswerteeinheit AW1 gekoppelt. Über die in Fig. 1 dargestellte Parallelschaltung der beiden Lampen Lp1 und Lp2 werden zwar die ersten Wendelelektroden W1 optimal geheizt, jedoch ist eine Wendelelektrodendetektion nicht möglich, denn die Auswerteeinheit AW1 erhält ein Signal, sobald eine der beiden ersten Wendelelektroden W1 eingesetzt ist.The problem addressed by the present invention resides in helical electrode detection multi-lamp ballasts. This is to ensure that when applied input voltage, the ballast is released only when the last coil electrode is contacted in the socket. A release before this time would involve the risk that the full ignition voltage could be transmitted to an operator. In addition to the complete filament electrode detection, however, the requirements of the filament electrodes during pre-heating and continuous heating must be observed at the same time. From the prior art, no optimal solutions to this problem are known. The previous approaches involve either a parallel connection, see Fig. 1 , or a series connection, see Fig. 2 , the helical electrodes. In the Fig. 1 The circuit arrangement shown has a first lamp Lp1 and a second lamp Lp2. The first lamp Lp1 has a first filament electrode W1 with a first terminal A1 and a second terminal A2 and a second filament electrode W2 with a first terminal A1 and a second terminal A2. The second lamp Lp2 has a first coil electrode W1 and a second coil electrode W2. The first helical electrode W1 comprises a first terminal A1 and a second terminal A2. The second coil electrode W2 includes a first terminal A1 and a second terminal A2. Via a resistor R1, a supply voltage Uv is applied to a point at which the terminal A1 of the coil electrode W1 of the first lamp Lp1 is coupled to the terminal A1 of the coil electrode W1 of the second lamp Lp2. The connection point of the terminal A2 of the coil electrode W1 of the first lamp Lp1 to the terminal A2 of the coil electrode W1 of the second lamp Lp2 is via the series connection of a heating coil L1 and a diode D1 on the one hand connected to the resistor R1, so that there is a parallel connection of the two first helical electrodes W1. On the other hand, this point is coupled via a resistor R2 to an evaluation unit AW1. About the in Fig. 1 shown parallel connection of the two lamps Lp1 and Lp2 Although the first helical electrodes W1 are optimally heated, but a helical electrode detection is not possible, because the evaluation AW1 receives a signal as soon as one of the first coil electrodes W1 is inserted.

Die Fig. 2, die eine Reihenschaltung der Lampen Lp1 und Lp2 zeigt, und für die wie auch für die folgenden Figuren die im Zusammenhang mit Fig. 1 eingeführten Bezugszeichen für gleiche und ähnliche Bauelemente übernommen werden, ermöglicht zwar die Wendelelektrodendetektion, jedoch haben Untersuchungen ergeben, dass sich durch die Reihenschaltung der jeweils ersten Wendelelektrode W1, welche in der Praxis unterschiedliche Wendelelektrodenwiderstände aufweisen, diese nach kurzer Zeit im gedimmten Zustand schwarz färben.The Fig. 2 showing a series connection of the lamps Lp1 and Lp2, and for the as well as for the following figures associated with Fig. 1 introduced reference numerals for the same and similar components, although allows the Wendelelektrodendetektion, but studies have shown that by the series connection of each first coil electrode W1, which have different filament electrode resistances in practice, they black after a short time in the dimmed state.

DE 69 916 251 T2 offenbart ein elektronisches Vorschaltgerät zum Betreiben einer Gruppe Gasentladungslampen. DE 69 916 251 T2 discloses an electronic ballast for operating a group of gas discharge lamps.

Darstellung der ErfindungPresentation of the invention

Die Aufgabe der vorliegenden Erfindung besteht deshalb darin, die eingangs genannte Schaltungsanordnung bzw. das eingangs genannte Verfahren derart weiterzubilden, dass eine zuverlässige Wendelelektrodendetektion ohne die unerwünschte Folge einer Schwarzfärbung der Wendelelektroden im gedimmten Zustand ermöglicht wird.The object of the present invention is therefore to further develop the circuit arrangement mentioned at the outset or the method mentioned at the outset such that a reliable filament electrode detection without the undesired consequence of blackening of the filament electrodes in the dimmed state is made possible.

Diese Aufgabe wird gelöst durch eine Schaltungsanordnung mit den Merkmalen von Patentanspruch 1 sowie durch ein Betriebsverfahren mit den Merkmalen von Patentanspruch 11.This object is achieved by a circuit arrangement with the features of claim 1 and by a Operating method with the features of claim 11.

Die vorliegende Erfindung basiert auf der Erkenntnis, dass diese Aufgabe gelöst werden kann durch eine geschickte Kombination aus Reihen- und Parallelschaltung. Letztere wird ermöglicht, indem zwei Vorheizvorrichtungen vorgesehen werden, wobei der Verbindungspunkt der beiden Vorheizvorrichtungen zusätzlich durch eine Mittelanzapfung mit dem jeweils zweiten Anschluss der ersten Wendelelektrode jeder Lampe verbunden ist. Durch diese Maßnahme wird einerseits eine optimale Vor- und Dauerheizung der Wendelelektroden garantiert, andererseits eine Detektion jeder Wendelelektrode ermöglicht.The present invention is based on the realization that this object can be achieved by a clever combination of series and parallel connection. The latter is made possible by providing two preheaters, the junction of the two preheaters being additionally connected by a center tap to the respective second terminal of the first filament electrode of each lamp. By this measure, on the one hand optimal pre-heating and heating of the helical electrodes is guaranteed, on the other hand allows detection of each helical electrode.

Bevorzugt ist dabei der erste Anschluss der ersten Wendelelektrode der ersten Lampe und der erste Anschluss der ersten Wendelelektrode der zweiten Lampe an den Versorgungsanschluss gekoppelt. Bei einer bevorzugten Ausführungsform ist die erste Vorheizvorrichtung an den ersten Anschluss der ersten Wendelelektrode der ersten Lampe gekoppelt und die zweite Vorheizvorrichtung an den ersten Anschluss der ersten Wendelelektrode der zweiten Lampe. Dabei ist zwischen die erste Vorheizvorrichtung und den ersten Anschluss der ersten Wendelelektrode der ersten Lampe eine erste Diode in Flussrichtung gekoppelt und zwischen die zweite Vorheizvorrichtung und den ersten Anschluss der ersten Wendelelektrode der zweiten Lampe ist eine zweite Diode in Flussrichtung gekoppelt. Bevorzugt ist weiterhin die Kopplung des zweiten Anschlusses der ersten Wendelelektrode der ersten Lampe mit dem zweiten Anschluss der ersten Wendelelektrode der zweiten Lampe an eine Auswerteeinrichtung gekoppelt.In this case, the first connection of the first coil electrode of the first lamp and the first connection of the first coil electrode of the second lamp are preferably coupled to the supply connection. In a preferred embodiment, the first preheater is coupled to the first terminal of the first filament electrode of the first lamp and the second preheater to the first terminal of the first filament electrode of the second lamp. In this case, a first diode in the flow direction is coupled between the first preheater and the first terminal of the first filament of the first lamp and between the second preheater and the first terminal of the first filament of the second lamp, a second diode is coupled in the flow direction. Furthermore, the coupling of the second terminal of the first filament electrode of the first lamp to the second terminal of the first filament electrode of the second lamp is preferably coupled to an evaluation device.

Das Prinzip, auf dem die vorliegende Erfindung basiert, kann ausgeweitet werden auf Schaltungsanordnungen mit mehr als zwei Lampen. Bevorzugt weist eine derartige Schaltungsanordnung beispielsweise einen ersten und einen zweiten Anschluss für die erste Wendelelektrode einer dritten Lampe und einen ersten und einen zweiten Anschluss für die zweite Wendelelektrode der dritten Lampe auf, wobei der erste Anschluss für die erste Wendelelektrode der dritten Lampe an den Versorgungsanschluss gekoppelt ist, wobei der zweite Anschluss für die erste Wendelelektrode der dritten Lampe an eine Auswerteeinrichtung gekoppelt ist, wobei der erste Anschluss für die zweite Wendelelektrode der dritten Lampe an den ersten Anschluss der zweiten Wendelelektrode der ersten Lampe gekoppelt ist und wobei der zweite Anschluss für die zweite Wendelelektrode der dritten Lampe an eine Auswerteeinrichtung gekoppelt ist.The principle on which the present invention is based can be extended to circuit arrangements with more than two lamps. For example, such a circuit arrangement preferably has a first and a second terminal for the first filament electrode of a third lamp and a first and a second terminal for the second filament electrode of the third lamp, wherein the first terminal for the first filament electrode of the third lamp is coupled to the supply terminal wherein the second terminal for the first filament electrode of the third lamp is coupled to an evaluation device, wherein the first terminal for the second filament electrode of the third lamp is coupled to the first terminal of the second filament electrode of the first lamp and wherein the second terminal for the second Coil electrode of the third lamp is coupled to an evaluation device.

Bei einem bevorzugten Ausführungsbeispiel mit vier Lampen weist die Schaltungsanordnung auf einen ersten und einen zweiten Anschluss für eine erste Wendelelektrode einer dritten Lampe, einen ersten und einen zweiten Anschluss für eine zweite Wendelelektrode der dritten Lampe, einen ersten und einen zweiten Anschluss für eine erste Wendelelektrode einer vierten Lampe und einen ersten und einen zweiten Anschluss für eine zweite Wendelelektrode der vierten Lampe. Dabei ist der mindestens eine Versorgungsanschluss weiterhin ausgelegt zum Zuführen einer Versorgungsspannung an die jeweils erste Wendelelektrode der dritten und der vierten Lampe, wobei der zweite Anschluss der ersten Wendelelektrode der dritten Lampe an einen zweiten Anschluss der ersten Wendelelektrode der vierten Lampe gekoppelt ist, wobei die Vorheizvorrichtung weiterhin eine dritte Vorheizinduktivität und eine vierte Vorheizinduktivität umfasst, die seriell zueinander angeordnet sind, wobei die Kopplung der dritten und vierten Vorheizinduktivität an die Kopplung des zweiten Anschlusses der ersten Wendelelektrode der dritten Lampe und des zweiten Anschlusses der ersten Wendelelektrode der vierten Lampe gekoppelt ist.In a preferred embodiment with four lamps, the circuit arrangement comprises a first and a second terminal for a first filament electrode of a third lamp, a first and a second terminal for a second filament electrode of the third lamp, a first and a second terminal for a first filament electrode fourth lamp and a first and a second terminal for a second filament electrode of the fourth lamp. In this case, the at least one supply connection is furthermore designed to supply a supply voltage to the respective first coil electrode of the third and the fourth lamp, the second connection of the first coil electrode of the third lamp to a second connection of the first coil electrode of the fourth coil Wherein the preheating device further comprises a third preheating inductance and a fourth preheating inductance arranged in series with each other, wherein the coupling of the third and fourth preheating inductances to the coupling of the second terminal of the first filament electrode of the third lamp and the second terminal of the first filament electrode the fourth lamp is coupled.

Bei einer bevorzugten Ausführungsform können die erste und die zweite Lampe auch derart verschaltet sein, dass die Kopplung des zweiten Anschlusses der ersten Wendelelektrode der ersten Lampe mit dem zweiten Anschluss der ersten Wendelelektrode der zweiten Lampe mit dem Versorgungsanschluss gekoppelt ist. Darauf aufbauend ergeben sich bevorzugte Schaltungsanordnungen, die denen, bei denen der erste Anschluss der ersten Wendelelektrode der ersten Lampe und der erste Anschluss der ersten Wendelelektrode der zweiten Lampe an den Versorgungsanschluss gekoppelt sind, und den in diesem Zusammenhang erwähnten bevorzugten Ausführungsformen, siehe oben, entsprechen.In a preferred embodiment, the first and the second lamp can also be connected in such a way that the coupling of the second terminal of the first filament electrode of the first lamp to the second terminal of the first filament electrode of the second lamp is coupled to the supply terminal. Based on this, preferred circuit arrangements which correspond to those in which the first terminal of the first filament electrode of the first lamp and the first terminal of the first filament electrode of the second lamp are coupled to the supply terminal, and the preferred embodiments mentioned in this context, see above ,

So ist bei einer ersten bevorzugten Ausführungsform die erste Vorheizvorrichtung an den ersten Anschluss der ersten Wendelelektrode der ersten Lampe gekoppelt und die zweite Vorheizvorrichtung an den ersten Anschluss der ersten Wendelelektrode der zweiten Lampe, wobei zwischen den ersten Anschluss der ersten Wendelelektrode der ersten Lampe und der ersten Vorheizvorrichtung eine dritte Diode in Flussrichtung gekoppelt ist und wobei zwischen den ersten Anschluss der ersten Wendelelektrode der zweiten Lampe und der zweiten Vorheizvorrichtung eine vierte Diode in Flussrichtung gekoppelt ist.Thus, in a first preferred embodiment, the first preheater is coupled to the first terminal of the first filament electrode of the first lamp and the second preheater is coupled to the first terminal of the first filament electrode of the second lamp, between the first terminal of the first filament electrode of the first lamp and the first Preheating a third diode is coupled in the flow direction and wherein between the first terminal of the first coil electrode of the second lamp and the second preheater, a fourth diode is coupled in the flow direction.

Bei den beiden letztgenannten Varianten ist weiterhin bevorzugt, wenn die Kopplung des ersten Anschlusses der ersten Wendelelektrode der ersten Lampe mit der ersten Vorheizvorrichtung und die Kopplung des ersten Anschlusses der ersten Wendelelektrode der zweiten Lampe an eine Auswerteeinrichtung gekoppelt ist.In the latter two variants, it is further preferred if the coupling of the first terminal of the first filament electrode of the first lamp to the first preheating device and the coupling of the first terminal of the first filament electrode of the second lamp to an evaluation device is coupled.

Bei der Variante der erfindungsgemäßen Schaltungsanordnung, bei der die Kopplung des zweiten Anschlusses der ersten Wendelelektrode der ersten Lampe mit dem zweiten Anschluss der ersten Wendelelektrode der zweiten Lampe an den Versorgungsanschluss gekoppelt ist, ergibt sich eine bevorzugte Schaltungsanordnung mit mehr als zwei Lampen beispielsweise dadurch, dass die Schaltungsanordnung einen ersten und einen zweiten Anschluss für die erste Wendelelektrode einer dritten Lampe und einen ersten und einen zweiten Anschluss für die zweite Wendelelektrode der dritten Lampe aufweist, wobei der erste Anschluss für die erste Wendelelektrode der dritten Lampe an eine Auswerteeinrichtung gekoppelt ist, wobei der zweite Anschluss für die erste Wendelelektrode der dritten Lampe an den Versorgungsanschluss gekoppelt ist, wobei der erste Anschluss für die zweite Wendelelektrode der dritten Lampe an den ersten Anschluss der zweiten Wendelelektrode der ersten Lampe gekoppelt ist und wobei der zweite Anschluss für die zweite Wendelelektrode der dritten Lampe an den Versorgungsanschluss gekoppelt ist.In the variant of the circuit arrangement according to the invention in which the coupling of the second terminal of the first coil electrode of the first lamp is coupled to the second terminal of the first coil electrode of the second lamp to the supply terminal, a preferred circuit arrangement with more than two lamps, for example, results in that the circuit arrangement has a first and a second terminal for the first filament electrode of a third lamp and a first and a second terminal for the second filament electrode of the third lamp, wherein the first terminal for the first filament electrode of the third lamp is coupled to an evaluation device, wherein the second terminal for the first filament electrode of the third lamp is coupled to the supply terminal, wherein the first terminal for the second filament electrode of the third lamp is coupled to the first terminal of the second filament electrode of the first lamp and wherein the zw Connection for the second filament electrode of the third lamp is coupled to the supply terminal.

Weitere vorteilhafte Ausführungsformen ergeben sich aus den Unteransprüchen.Further advantageous embodiments will become apparent from the dependent claims.

Die mit Bezug auf eine erfindungsgemäße Schaltungsanordnung erläuterten bevorzugten Ausführungsformen gelten in entsprechender Weise für das erfindungsgemäße Betriebsverfahren.The preferred embodiments explained with reference to a circuit arrangement according to the invention apply in FIG corresponding manner for the operating method according to the invention.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Nachfolgenden werden nunmehr Ausführungsbeispiele der Erfindung unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben. Es zeigen:

Fig. 1
eine aus dem Stand der Technik bekannte Schal- tungsanordnung, bei der die erste Wendelelektrode der ersten Lampe und die erste Wendelelektrode der zweiten Lampe parallel geschaltet sind;
Fig. 2
eine aus dem Stand der Technik bekannte Schal- tungsanordnung, bei der die erste Wendelelektrode der ersten Lampe und die erste Wendelelektrode der zweiten Lampe in Reihe geschaltet sind;
Fig. 3
eine erste Ausführungsform einer erfindungsgemäßen Schaltungsanordnung mit zwei Lampen;
Fig. 3a
eine Variante der ersten Ausführungsform einer erfindungsgemäßen Schaltungsanordnung mit zwei Lampen;
Fig. 4
eine zweite Ausführungsform einer erfindungsgemä- ßen Schaltungsanordnung mit zwei Lampen;
Fig. 5
eine erste Ausführungsform einer erfindungsgemäßen Schaltungsanordnung mit drei Lampen;
Fig. 6
eine zweite Ausführungsform einer erfindungsgemä- ßen Schaltungsanordnung mit drei Lampen;
Fig. 7
eine Ausführungsform einer erfindungsgemäßen Schaltungsanordnung mit vier Lampen; und
Fig. 8
eine Ausführungsform einer erfindungsgemäßen Schaltungsanordnung mit sechs Lampen.
In the following, embodiments of the invention will now be described in detail with reference to the accompanying drawings. Show it:
Fig. 1
a circuit arrangement known from the prior art in which the first filament electrode of the first lamp and the first filament electrode of the second lamp are connected in parallel;
Fig. 2
a circuit arrangement known from the prior art in which the first filament electrode of the first lamp and the first filament electrode of the second lamp are connected in series;
Fig. 3
a first embodiment of a circuit arrangement according to the invention with two lamps;
Fig. 3a
a variant of the first embodiment of a circuit arrangement according to the invention with two lamps;
Fig. 4
a second embodiment of an inventive circuit arrangement with two lamps;
Fig. 5
a first embodiment of a circuit arrangement according to the invention with three lamps;
Fig. 6
a second embodiment of an inventive circuit arrangement with three lamps;
Fig. 7
an embodiment of a circuit arrangement according to the invention with four lamps; and
Fig. 8
an embodiment of a circuit arrangement according to the invention with six lamps.

Bevorzugte Ausführung der ErfindungPreferred embodiment of the invention

Die mit Bezug auf den in den Figuren 1 und 2 dargestellten Stand der Technik eingeführten Bezugszeichen werden, soweit anwendbar, für die in den Figuren 3 bis 8 dargestellten Ausführungsformen einer erfindungsgemäßen Schaltungsanordnung beibehalten und nicht nochmals erläutert. Insofern wird im Nachfolgenden lediglich auf die Unterschiede zu den in den Figuren 1 und 2 vorgestellten, bekannten Schaltungsanordnungen eingegangen.With respect to in the Figures 1 and 2 are introduced, as far as applicable, for in the FIGS. 3 to 8 illustrated embodiments of a circuit arrangement according to the invention and not explained again. Insofar, in the following, only the differences to those in the Figures 1 and 2 presented, known circuit arrangements received.

Bei der in Fig. 3 dargestellten Ausführungsform einer erfindungsgemäßen Schaltungsanordnung ist sowohl der erste Anschluss A1 der ersten Wendelelektrode W1 der ersten Lampe Lp1 als auch der erste Anschluss A1 der ersten Wendelelektrode W1 der zweiten Lampe Lp2 über einen ohmschen Widerstand R11, R12 mit der Versorgungsspannung Uv verbunden, welche - wie für den Fachmann offensichtlich - bevorzugt die so genannte Zwischenkreisspannung darstellt. Die Vorheizvorrichtung umfasst eine erste Vorheizinduktivität L11 und eine zweite Vorheizinduktivität L12. Die Vorheizinduktivität L11 ist über eine Diode D11 in Flussrichtung mit dem ersten Anschluss A1 der ersten Wendelelektrode W1 der ersten Lampe Lp1 verbunden, während die zweite Vorheizinduktivität L12 über eine zweite Diode D12 in Flussrichtung mit dem ersten Anschluss A1 der ersten Wendelelektrode W1 der zweiten Lampe Lp2 verbunden ist. Der Verbindungspunkt zwischen dem zweiten Anschluss A2 der ersten Wendelelektrode W1 der ersten Lampe Lp1 und dem zweiten Anschluss A2 der zweiten Wendelelektrode W2 der zweiten Lampe Lp2 ist einerseits über einen Widerstand R2 mit einem Anschluss P7 der Auswerteeinheit AW1 verbunden, andererseits nach Art einer Mittelanzapfung mit dem Verbindungspunkt zwischen der ersten Vorheizinduktivität L11 und der zweiten Vorheizinduktivität L12. Die Mittelanzapfung ist nötig, damit während des Vor- bzw. Dauerheizens eine Parallelschaltung der jeweils ersten Wendelelektrode W1 gewährleistet werden kann, womit eine Schwarzfärbung einer der Wendelelektroden aufgrund unterschiedlichen Wendelelektrodenwiderstands verhindert werden kann. Dadurch, dass sowohl der erste Anschluss A1 der ersten Wendelelektrode W1 der ersten Lampe Lp1 mit der Spannungsversorgung Uv verbunden ist als auch der erste Anschluss A1 der ersten Wendelelektrode W1 der zweiten Lampe Lp2, wird an der Auswerteeinheit AW1 eine zuverlässige Wendelelektrodendetektion ermöglicht: Bei analoger Ausbildung der Auswerteeinheit AW1 findet somit eine Summenbildung des Anteils, der sich über die Lampe Lp1 ergibt, sowie des Anteils, der sich über die Lampe Lp2 ergibt, statt. Bevorzugt findet eine Auswertung auf der Basis unterschiedlicher Versorgungsspannungen Uv in analoger Form statt. Zur Vor- und/bzw. Dauerheizung der Wendel W2 der Lampe Lp1 ist eine Induktivität L21 und eine Diode D21 vorgesehen, wobei der Anschluss A1 über eine Induktivität LD mit dem Halbbrückenmittelpunkt HB, einer Halbbrückenschaltung verbunden ist. Wie für den Fachmann offensichtlich können auch andere Schaltungskonzepte zum Betrieb einer erfindungsgemäßen Schaltungsanordnung Anwendung finden, beispielsweise Vollbrücke, Sperrwandler etc. Der Anschluss A2 der Wendel W2 der Lampe Lp2 ist über einen Widerstand R8 mit der Versorgungsspannung Uv verbunden. Zur Vorheizung ist eine Induktivität L22 und eine Diode D22 vorgesehen. Das Signal am Ausgang A1 wird über einen Widerstand R7 dem Anschluss P6 der Auswerteeinheit AW1 zugeführt. Die Primärwicklungen zu den Induktivitäten L21, L22, L11 und L12 sind aus Gründen der Übersichtlichkeit nicht dargestellt. Unter Verwendung der Dioden D31, D32 und des Kondensators C31 wird am Eingang P2 der Auswerteeinheit AW1 eine Istwert-Erkennung des Lampenstroms der Lampe Lp2 durchgeführt. Die einheitlich mit Uv gekennzeichneten Versorgungsspannungsanschlüsse können, soweit zur Auswertung durch die Auswerteeinheit sinnvoll, mit Versorgungsspannungen Uv unterschiedlicher Amplitude verbunden sein. Letzteres gilt für alle im den Figuren 4 bis 8 dargestellten Ausführungsformen.At the in Fig. 3 illustrated embodiment of a circuit arrangement according to the invention, both the first terminal A1 of the first coil electrode W1 of the first lamp Lp1 and the first terminal A1 of the first coil electrode W1 of the second lamp Lp2 via a resistor R11, R12 connected to the supply voltage Uv, which - as for the skilled person obvious - preferably represents the so-called intermediate circuit voltage. The preheater includes a first preheat inductor L11 and a second preheat inductor L12. The preheating inductance L11 is connected via a diode D11 in the flow direction to the first terminal A1 of the first filament electrode W1 of the first lamp Lp1, while the second preheating inductance L12 via a second diode D12 in the flow direction to the first terminal A1 of the first filament electrode W1 of the second lamp Lp2 connected is. The connection point between the second terminal A2 of the first coil electrode W1 of the first lamp Lp1 and the second terminal A2 of the second coil electrode W2 of the second lamp Lp2 is connected on the one hand via a resistor R2 to a terminal P7 of the evaluation unit AW1, on the other hand in the manner of a center tap with the Connection point between the first preheating inductance L11 and the second preheating inductance L12. The center tap is necessary so that a parallel connection of each first coil electrode W1 can be ensured during the pre-heating or continuous heating, whereby a black coloration of one of the coil electrodes due to different coil electrode resistance can be prevented. The fact that both the first terminal A1 of the first coil electrode W1 of the first lamp Lp1 is connected to the power supply Uv and the first terminal A1 of the first coil electrode W1 of the second lamp Lp2, a reliable filament electrode detection is possible at the evaluation unit AW1: In analog training the evaluation unit AW1 thus finds a summation of the proportion, which results from the lamp Lp1, as well as the proportion, which results from the lamp Lp2 instead. Preferably, an evaluation takes place on the basis of different supply voltages Uv in analog form. For pre- and / or. Continuous heating of the filament W2 of the lamp Lp1, an inductance L21 and a diode D21 is provided, wherein the terminal A1 is connected via an inductance L D with the half-bridge center H B , a half-bridge circuit. As is obvious to the person skilled in the art, other circuit concepts can also be used for operating a circuit arrangement according to the invention, for example full bridge, flyback converter etc. The terminal A2 of the coil W2 of the lamp Lp2 is connected via a resistor R8 to the supply voltage Uv. For preheating an inductance L22 and a diode D22 is provided. The signal at the output A1 is fed via a resistor R7 to the terminal P6 of the evaluation unit AW1. The primary windings to the inductors L21, L22, L11 and L12 are not shown for reasons of clarity. Using the diodes D31, D32 and the capacitor C31, an actual value detection of the lamp current of the lamp Lp2 is performed at the input P2 of the evaluation unit AW1. The supply voltage connections, which are identified uniformly by Uv, may be connected to supply voltages Uv of different amplitudes, where appropriate for evaluation by the evaluation unit. The latter applies to everyone in the FIGS. 4 to 8 illustrated embodiments.

In der Fig. 3a ist ausschnittweise eine alternative Variante zur Ausführungsform nach Fig. 3 dargestellt. Im Vergleich zu Fig. 3 ist in Fig. 3a die Polarität der Diode D11 umgedreht. Damit gibt es keinen Gleichstrompfad für einen Strom, der durch die Widerstände R12 und R11 und nur über eine der Wendeln W1 der Lampen Lp1 und Lp2 führt. Aus diesem Grund ist im Vergleich zu Fig. 3 in Fig. 3a nur der Widerstand R11 mit der Versorgungsspannung Uv verbunden und nicht der Widerstand R12. Vielmehr ist der Widerstand R12 über den Anschluss P3a mit der Auswerteeinheit verbunden. Vorteilhaft gegenüber der Variante aus Fig 3 braucht die Auswerteeinheit am Anschluss P3a nicht über unterschiedliche Amplituden die beiden Wendeln W1 der Lampen Lp1 und Lp2 abfragen. Vielmehr genügt ein einfacher Test, ob eine Gleichspannung vorhanden ist oder nicht. Damit wird nicht nur der Aufwand für die Wendelabfrage reduziert, sondern auch die Zuverlässigkeit der Abfrage erhöht. Des weiteren kann in der Variante nach Fig. 3a gegenüber Fig. 3 der Anschluss P7 und der zugehörige Widerstand R2 entfallen. Damit wird vorteilhaft die Topolgie der Schaltungsanordnung vereinfacht.In the Fig. 3a is fragmentary an alternative variant to the embodiment according to Fig. 3 shown. Compared to Fig. 3 is in Fig. 3a reversed the polarity of diode D11. Thus, there is no DC path for a current passing through resistors R12 and R11 and only one of the coils W1 of lamps Lp1 and Lp2. This is why compared to Fig. 3 in Fig. 3a only the resistor R11 is connected to the supply voltage Uv and not the resistor R12. Rather, the resistor R12 is connected via the connection P3a to the evaluation unit. Advantageous compared to the variant Fig. 3 If the evaluation unit does not need to interrogate the two coils W1 of the lamps Lp1 and Lp2 via different amplitudes at the connection P3a. Rather, a simple test is sufficient if a DC voltage is available is or not. This not only reduces the effort for the helical scan, but also increases the reliability of the query. Furthermore, in the variant Fig. 3a across from Fig. 3 the connection P7 and the associated resistor R2 are omitted. This advantageously simplifies the topology of the circuit arrangement.

Im Vergleich zu Fig. 3 ist in Fig. 3a ist auch der Wickelsinn der Induktivität L11 umgedreht; dies hat jedoch keine Auswirkung auf die Wendeldetektion, wie sie Gegenstand der vorliegenden Erfindung ist. Für die Wendeldetektion ist der Wickelsinn der Induktivitäten beliebig.Compared to Fig. 3 is in Fig. 3a is also the winding sense of the inductance L11 reversed; However, this has no effect on the Wendeldetektion as it is the subject of the present invention. For Wend detection the Wicklungsinn of the inductors is arbitrary.

Die vorteilhafte Änderung der Ausführungsform gemäß Fig. 3 zur Fig. 3a kann in gleicher Weise auch auf die Ausführungsformen gemäß der Figuren 4 und 5 angewandt werden.The advantageous modification of the embodiment according to Fig. 3 to Fig. 3a can in the same way also to the embodiments according to the FIGS. 4 and 5 be applied.

Bei der in Fig. 4 dargestellten zweiten Ausführungsform einer erfindungsgemäßen Schaltungsanordnung ist der Verbindungspunkt zwischen dem zweiten Anschluss A2 der ersten Wendelelektrode W1 der ersten Lampe Lp3 mit dem zweiten Anschluss A2 der ersten Wendelelektrode W1 der zweiten Lampe Lp4 über einen Widerstand R1 mit der Versorgungsspannung Uv verbunden. Der erste Anschluss A1 der ersten Wendelelektrode W1 der ersten Lampe Lp3 ist über einen Widerstand R21 mit dem Eingang P1 der Auswerteeinheit AW1, der erste Anschluss A1 der ersten Wendelelektrode W1 der zweiten Lampe Lp4 über einen Widerstand R22 mit dem Eingang P4 der Auswerteeinheit AW1 verbunden. Der erste Anschluss A1 der ersten Wendelelektrode W1 der ersten Lampe Lp3 ist über eine Diode D13 mit einer ersten Vorheizinduktivität L13 verbunden, während der erste Anschluss A1 der ersten Wendelelektrode W1 der zweiten Lampe Lp4 über eine Diode D14 mit einer zweiten Vorheizinduktivität L14 verbunden ist. Der Verbindungspunkt der beiden Vorheizinduktivitäten L13 und L14 ist über eine Mittelanzapfung mit dem Verbindungspunkt der Anschlüsse A2 der ersten Wendel W1 der ersten Lampe Lp3 und A2 der ersten Wendelelektrode W1 der zweiten Lampe Lp4 verbunden. Durch die Mittelanzapfung wird im Vor- bzw. Dauerheizbetrieb wieder eine Parallelschaltung der beiden ersten Wendelelektroden W1 ermöglicht, während eine Wendelelektrodendetektion über die der Auswerteeinheit AW1 an ihren Eingängen zugeführten Signale ermöglicht wird. Die Diode D23 und die Induktivität L23 dienen der Vorheizung der zweiten Wendel W2 der ersten Lampe Lp3, während die Diode D24 und die Induktivität L24 der Vorheizung der zweiten Wendelelektrode W2 der zweiten Lampe Lp4 dienen. Die Funktion der Elemente R6, P5, R9, C32, D31 und D32 entspricht der Funktion der Elemente R7, P6, R8, C31, D32, D31 in dem Ausführungsbeispiel von Fig. 3.At the in Fig. 4 2, the connection point between the second terminal A2 of the first coil electrode W1 of the first lamp Lp3 and the second terminal A2 of the first coil electrode W1 of the second lamp Lp4 is connected to the supply voltage Uv via a resistor R1. The first terminal A1 of the first coil electrode W1 of the first lamp Lp3 is connected via a resistor R21 to the input P1 of the evaluation unit AW1, the first terminal A1 of the first coil electrode W1 of the second lamp Lp4 via a resistor R22 to the input P4 of the evaluation AW1. The first terminal A1 of the first coil electrode W1 of the first lamp Lp3 is connected via a diode D13 to a first preheating inductance L13, while the first terminal A1 of the first coil electrode W1 of the second lamp Lp4 is connected via a diode D14 to a second preheating inductance L14. The connection point of the two Vorheizinduktivitäten L13 and L14 is connected via a center tap to the connection point of the terminals A2 of the first coil W1 of the first lamp Lp3 and A2 of the first coil electrode W1 of the second lamp Lp4. Due to the center tap, a parallel connection of the two first coil electrodes W1 is again enabled in the preheating or continuous heating mode, while a coil electrode detection is made possible via the signals supplied to the evaluation unit AW1 at their inputs. The diode D23 and the inductor L23 serve to pre-heat the second filament W2 of the first lamp Lp3, while the diode D24 and the inductor L24 serve to preheat the second filament electrode W2 of the second lamp Lp4. The function of the elements R6, P5, R9, C32, D31 and D32 corresponds to the function of the elements R7, P6, R8, C31, D32, D31 in the embodiment of FIG Fig. 3 ,

Bei den in den Figuren 3 und 4 dargestellten Ausführungformen kann eine Überwachung der Wendel W2 der Lampe Lp1 sowie der Wendel W2 der Lampe LP3 auch entfallen. Diese ist erst nötig, wenn bei einem mehrlampigen Betrieb ein Symmetriertransformator (vgl. L31, L32 in Fig. 5) verwendet wird, der die Zündspannung "von unten" liefert.In the in the Figures 3 and 4 illustrated embodiments, a monitoring of the filament W2 of the lamp Lp1 and the filament W2 of the lamp LP3 also omitted. This is only necessary if a symmetrical transformer (compare L31, L32 in Fig. 5 ), which supplies the ignition voltage "from below".

Die Fig. 5 stellt eine Weiterbildung des in Fig. 3 vorgestellten Ausführungsbeispiels in Form einer Variante mit drei Lampen Lp1, Lp2, Lp6 dar. Dabei ist zunächst der Anschluss A2 der zweiten Wendel W2 der Lampe Lp1 über einen Widerstand R4 mit dem Versorgungsanschluss Uv verbunden. Die dritte Lampe Lp6 weist eine erste Wendel W1 mit einem ersten und einem zweiten Anschluss A1, A2 sowie eine zweite Wendel W2 mit einem ersten und einem zweiten Anschluss A1, A2 auf. Der Anschluss A1 der zweiten Wendel W2 der Lampe Lp6 ist mit dem Anschluss A1 der zweiten Wendel W2 der Lampe Lp1 verbunden. Der Anschluss A2 der zweiten Wendel W2 der Lampe Lp6 ist über einen Widerstand R3 mit dem Anschluss P0 der Auswerteeinheit verbunden. Der Anschluss A2 der Wendel W1 der Lampe Lp6 ist über einen Widerstand R6 mit dem Anschluss P5 der Auswerteeinheit verbunden. Der Anschluss A1 der Wendel W1 der Lampe Lp6 ist über einen Widerstand R9 mit dem Versorgungsanschluss Uv verbunden. Eine Induktivität L23 und eine dazu in Serie geschaltete Diode D23 sowie eine Induktivität L24 und eine dazu in Serie geschaltete Diode D24 dienen wieder der Vor- bzw. Dauerheizung der zugehörigen Wendeln. Die Schaltungsanordnung weist überdies einen Symmetriertransformator auf, der die Induktivitäten L31 und L32 umfasst. Seriell zu diesen beiden Induktivitäten L31, L32 sind die Halbbrückenkoppelkondensatoren C31 und C32 angeordnet. Der Koppelkondensator C32 ist über eine Diode D32 mit Masse verbunden, der Koppelkondensator C31 ist über eine Diode D31 mit dem Anschluss P2 der Auswerteeinheit zur Istwerterkennung des Lampenstroms verbunden.The Fig. 5 represents a further education of in Fig. 3 in the form of a variant with three lamps Lp1, Lp2, Lp6. In this case, first of all the connection A2 of the second filament W2 of the lamp Lp1 is connected to the supply connection Uv via a resistor R4. The third lamp Lp6 has a first coil W1 with a first and a second terminal A1, A2 and a second coil W2 with a first and a second terminal A1, A2 on. The terminal A1 of the second filament W2 of the lamp Lp6 is connected to the terminal A1 of the second filament W2 of the lamp Lp1. The terminal A2 of the second filament W2 of the lamp Lp6 is connected via a resistor R3 to the terminal P0 of the evaluation unit. The terminal A2 of the filament W1 of the lamp Lp6 is connected via a resistor R6 to the terminal P5 of the evaluation unit. The terminal A1 of the filament W1 of the lamp Lp6 is connected to the supply terminal Uv via a resistor R9. An inductor L23 and a diode D23 connected in series therewith as well as an inductance L24 and a diode D24 connected in series serve again for the pre-heating or continuous heating of the associated filaments. The circuit arrangement furthermore has a balancing transformer which comprises the inductors L31 and L32. The half-bridge coupling capacitors C31 and C32 are arranged in series with these two inductors L31, L32. The coupling capacitor C32 is connected via a diode D32 to ground, the coupling capacitor C31 is connected via a diode D31 to the terminal P2 of the evaluation unit for actual value detection of the lamp current.

Die in Fig. 6 dargestellte Ausführungsform ist eine Weiterbildung der in Fig. 4 dargestellten Ausführungsform auf die Verwendung von drei Lampen Lp3, Lp4, Lp5, wobei jedoch die Lampen Lp3, Lp4 der Schaltung gegenüber der Anordnung in Fig. 4 gespiegelt dargestellt sind. Zur Vermeidung doppelter Begriffe wurde der Anschluss der Auswerteeinheit, an dem der Anschluss A1 der zweiten Wendel W2 der Lampe Lp4 ausgewertet wird, mit P5 bezeichnet. Weiterhin wird der Anschluss A1 der Wendel W2 der Lampe Lp3 über einen Widerstand R4 dem Eingang P0 der Auswerteeinheit zugeführt. Die in Fig. 6 dargestellte Ausführungsform weist gegenüber der Ausführungsform von Fig. 4 eine weitere Lampe Lp5 auf. Der Anschluss 1 der Wendel W1 der Lampe Lp5 ist über einen Widerstand R7 an den Eingang P6 der Auswerteeinheit geführt, der Anschluss A2 der Wendel W1 der Lampe Lp5 über einen Widerstand R8 mit der Versorgungsspannung Uv verbunden. Der Anschluss A1 der Wendel W2 der Lampe Lp5 ist mit dem Anschluss A2 der Wendel W2 der Lampe Lp3 verbunden. Der Anschluss A2 der Wendel W2 der Lampe Lp5 ist über einen Widerstand R4 mit der Versorgungsspannung Uv verbunden. Serienschaltungen aus jeweils einer Induktivität und einer Diode, d. h. die Serienschaltung D21 L21 und die Serienschaltung L22 D22, dienen wiederum der Vor- bzw. Dauerheizung der zugeordneten Wendeln der Lampe Lp5. Die Funktion der Elemente C31, C32, D31, D32, L31, L32 entspricht derjenigen von Fig. 5.In the Fig. 6 illustrated embodiment is a development of in Fig. 4 In the embodiment shown, the use of three lamps Lp3, Lp4, Lp5, but the lamps Lp3, Lp4 of the circuit with respect to the arrangement in Fig. 4 are shown mirrored. To avoid duplicate terms, the terminal of the evaluation unit, at which the terminal A1 of the second filament W2 of the lamp Lp4 is evaluated, is designated P5. Furthermore, the terminal A1 becomes the filament W2 of the lamp Lp3 fed via a resistor R4 the input P0 of the evaluation. In the Fig. 6 illustrated embodiment has with respect to the embodiment of Fig. 4 another lamp Lp5 on. The terminal 1 of the filament W1 of the lamp Lp5 is connected to the input P6 of the evaluation unit via a resistor R7, and the terminal A2 of the filament W1 of the lamp Lp5 is connected to the supply voltage Uv via a resistor R8. The terminal A1 of the filament W2 of the lamp Lp5 is connected to the terminal A2 of the filament W2 of the lamp Lp3. The terminal A2 of the filament W2 of the lamp Lp5 is connected via a resistor R4 to the supply voltage Uv. Series circuits each comprising an inductance and a diode, ie the series circuit D21 L21 and the series circuit L22 D22, in turn serve the pre-heating or heating of the associated filaments of the lamp Lp5. The function of elements C31, C32, D31, D32, L31, L32 corresponds to that of Fig. 5 ,

Die in Fig. 7 dargestellte Ausführungsform entspricht einer Kombination der linken beiden Lampen Lp1, Lp2 gemäß der Ausführungsform von Fig. 5 und der rechten beiden Lampen Lp3, Lp4 der Ausführungsform von Fig. 6. Der Sachverhalt, dass die Beschaltung an den beiden Anschlüssen A1, A2 einer Wendel W1 oder W2 bei der Ausführungsform von Fig. 7 gegenüber den Ausführungsformen von Fig. 5 oder Fig. 6 vertauscht sind, hat, wie für den Fachmann offensichtlich, für die Auswertung keinerlei Bedeutung.In the Fig. 7 illustrated embodiment corresponds to a combination of the left two lamps Lp1, Lp2 according to the embodiment of Fig. 5 and the right two lamps Lp3, Lp4 of the embodiment of FIG Fig. 6 , The fact that the circuit at the two terminals A1, A2 of a helix W1 or W2 in the embodiment of Fig. 7 compared to the embodiments of Fig. 5 or Fig. 6 As is obvious to the person skilled in the art, it has no significance for the evaluation.

Nicht dargestellt sind zwei Ausführungsformen mit 4 Lampen, bei denen die eine zweimal die in Fig. 3 dargestellte Ausführungsform, die andere zweimal die in Fig. 4 dargestellt Ausführungsform umfasst.Not shown are two embodiments with 4 lamps, in which one twice the in Fig. 3 illustrated embodiment, the other twice the in Fig. 4 illustrated embodiment comprises.

Fig. 8 zeigt eine Ausführungsform mit sechs Lampen Lp1, Lp2, Lp3, Lp4, Lp6, Lp6, wobei sich die Ausführungsform gemäß Fig. 8 zusammensetzt aus der Ausführungsform von Fig. 5, wobei hiervon die Lampen Lp1, Lp2 und Lp6 übernommen worden sind, sowie der Ausführungsform von Fig. 6, von der die Lampen Lp3, Lp4 und Lp5 übernommen worden sind. Bei einer bevorzugten Ausbildung der Ausführungsform gemäß Fig. 8 bilden die Induktivitäten L11, L12, L13 und L14 die Sekundärwicklungen eines ersten Heiztrafos, während die Induktivitäten L21, L22, L23 und L24 die Sekundärwicklungen zu einem zweiten Heiztrafo bilden. Fig. 8 shows an embodiment with six lamps Lp1, Lp2, Lp3, Lp4, Lp6, Lp6, wherein the embodiment according to Fig. 8 composed of the embodiment of Fig. 5 of which the lamps Lp1, Lp2 and Lp6 have been adopted, as well as the embodiment of FIG Fig. 6 from which the lamps Lp3, Lp4 and Lp5 have been adopted. In a preferred embodiment of the embodiment according to Fig. 8 The inductors L11, L12, L13 and L14 form the secondary windings of a first heating transformer, while the inductors L21, L22, L23 and L24 form the secondary windings to form a second heating transformer.

Bei einem bevorzugten Ausführungsbeispiel sind die Eingänge P0, P1 und P4, soweit vorhanden, mit digitalen Eingängen eines Mikroprozessors der Auswerteeinheit AW1 verbunden, während die Eingänge P5, P6 und P7 mit analogen Eingängen eines Mikroprozessors der Auswerteeinheit AW1 verbunden sind. Falls die Wendelelektrode W2 der Lampe Lp1 und die Wendelelektrode W2 der Lampe Lp3 eingesetzt sind, liegt am Eingang P0 eine digitale "1" an, andernfalls eine "0". Entsprechendes gilt für die Wendelelektroden W1 der Lampe Lp4 und W1 der Lampe Lp3, die an den Eingängen P1 und P4 überwacht werden. Am Eingang P7 kann festgestellt werden, ob die Wendelelektroden W1 und W2 der Lampe Lp1 eingesetzt sind. Am Eingang P5 kann festgestellt werden, ob die Wendelelektroden W2 der Lampe Lp4 bzw. W1 der Lampe Lp6 eingesetzt sind. Am Eingang P6 kann festgestellt werden, ob die Wendelelektroden W2 der Lampe Lp2 bzw. W1 der Lampe Lp5 eingesetzt sind. Der Eingang P2 dient, wie bereits erwähnt, der Erfassung des Istwerts des Lampenstroms für eine nicht dargestellte Regeleinrichtung.In a preferred embodiment, the inputs P0, P1 and P4, if present, are connected to digital inputs of a microprocessor of the evaluation unit AW1, while the inputs P5, P6 and P7 are connected to analog inputs of a microprocessor of the evaluation unit AW1. If the filament electrode W2 of the lamp Lp1 and the filament electrode W2 of the lamp Lp3 are inserted, a digital "1" is present at the input P0, otherwise a "0". The same applies to the helical electrodes W1 of the lamp Lp4 and W1 of the lamp Lp3, which are monitored at the inputs P1 and P4. At the input P7 can be determined whether the helical electrodes W1 and W2 of the lamp Lp1 are used. At the input P5 it can be determined whether the filament electrodes W2 of the lamp Lp4 or W1 of the lamp Lp6 are inserted. At the input P6 it can be determined whether the filament electrodes W2 of the lamp Lp2 or W1 of the lamp Lp5 are inserted. The input P2 is, as already mentioned, the detection of the actual value of the lamp current for a control device, not shown.

Die im Vorhergehenden erwähnte Dauerheizung der Wendelelektroden kommt insbesondere beim Dimmen der Lampen in Betracht, um eine Schwarzfärbung der Wendelelektroden zu verhindern.The above-mentioned continuous heating of the helical electrodes is particularly considered when dimming the lamps to prevent blackening of the helical electrodes.

Claims (14)

  1. Circuit arrangement for operating at least one first and a second lamp (Lp1, Lp2), the first and the second lamp (Lp1, Lp2) in each case having a first and a second coil electrode (W1, W2), comprising
    - a first and a second terminal (A1, A2) for the first coil electrode (W1) of the first lamp (Lp1);
    - a first and a second terminal (A1, A2) for the second coil electrode (W2) of the first lamp (Lp1);
    - a first and a second terminal (A1, A2) for the first coil electrode (W1) of the second lamp (Lp2);
    - a first and a second terminal (A1, A2) for the second coil electrode (W2) of the second lamp (Lp2);
    - at least one supply terminal (Uv) for supplying a supply voltage to the respective first coil electrode (W1) of the at least one first and/or second lamp (Lp1, Lp2);
    - at least one preheating device (L11, L12) for the respective first coil electrode (W1) of the at least one first and second lamp (Lp1, Lp2);
    the second terminal (A2) of the first coil electrode (W1) of the first lamp (Lp1) being coupled in a coupling point to the second terminal (A2) of the first coil electrode (W1) of the second lamp (Lp2);
    characterized
    in that the preheating device comprises a first preheating inductance (L11) and a second preheating inductance (L12) which are arranged in series with one another, the junction of the first and of the second preheating inductance (L11, L12) being coupled to the coupling point of the second terminal (A2) of the first coil electrode (W1) of the first lamp (Lp1) and of the second terminal (A2) of the first coil electrode (W1) of the second lamp (Lp2).
  2. Circuit arrangement according to Claim 1, characterized in that the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp1) and the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp2) are coupled to the supply terminal (Uv).
  3. Circuit arrangement according to Claim 2, characterized in that the first preheating device (L11) is coupled to the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp1), and
    in that the second preheating device (L12) is coupled to the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp2),
    a first diode (D11) being coupled in the forward direction between the first preheating device (L11) and the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp1); and
    a second diode (D12) being coupled in the forward direction between the second preheating device (L12) and the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp2).
  4. Circuit arrangement according to one of Claims 2 and 3, characterized in that the coupling point of the second terminal (A2) of the first coil electrode (W1) of the first lamp (Lp1) to the second terminal (A2) of the first coil electrode (W1) of the second lamp (Lp2) is coupled to an evaluating device (AW1).
  5. Circuit arrangement according to Claim 1, characterized in that the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp2) is coupled to the supply terminal (Uv).
  6. Circuit arrangement according to Claim 5, characterized in that the first preheating device (L11) is coupled to the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp1), and
    in that the second preheating device (L12) is coupled to the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp2),
    a first diode (D11) being coupled in the reverse direction between the first preheating device (L11) and the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp1); and a second diode (D12) being coupled in the forward direction between the second preheating device (L12) and the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp2).
  7. Circuit arrangement according to one of Claims 5 and 6, characterized in that the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp1) is coupled to an evaluating device (AW1).
  8. Circuit arrangement according to one of Claims 2 to 7, characterized in that the circuit arrangement has a first and a second terminal (A1, A2) for the first coil electrode (W1) of a third lamp (Lp6) and a first and a second terminal (A1, A2) for the second coil electrode (W2) of the third lamp (Lp6), the first terminal (A1) for the first coil electrode (W1) of the third lamp (Lp6) being coupled to the supply terminal;
    the second terminal (A2) for the first coil electrode (W1) of the third lamp (Lp6) being coupled to an evaluating device; the first terminal (A1) for the second coil electrode (W2) of the third lamp (Lp6) being coupled to the first terminal (A1) of the second coil electrode (W2) of the first lamp (Lp1); and the second terminal (A2) for the second coil electrode (W2) of the third lamp (Lp6) being coupled to an evaluating device.
  9. Circuit arrangement according to one of Claims 2 to 7, characterized in that it also has:
    - a first and a second terminal (A1, A2) for a first coil electrode (W1) of a third lamp (Lp3);
    - a first and a second terminal (A1, A2) for a second coil electrode (W2) of the third lamp (Lp3);
    - a first and a second terminal (A1, A2) for a first coil electrode (W1) of a fourth lamp (Lp4); and
    - a first and a second terminal (A1, A2) for a second coil electrode (W2) of the fourth lamp (Lp4);
    the at least one supply terminal also being designed for supplying a supply voltage (Uv) to the respective first coil electrode (W1; W1) of the third and of the fourth lamp (Lp3, Lp4);
    the second terminal (A2) of the first coil electrode (W1) of the third lamp (Lp3) being coupled to the second terminal (A2) of the first coil electrode (W1) of the fourth lamp (Lp4);
    the preheating device also comprising a third preheating inductance (L13) and a fourth preheating inductance (L14) which are arranged in series with one another, the junction of the third and of the fourth preheating inductance (L13, L14) being coupled to the coupling point of the second terminal (A2) of the first coil electrode (31) of the third lamp (Lp3) and of the second terminal (A2) of the first coil electrode (W1) of the fourth lamp (Lp4).
  10. Circuit arrangement according to Claim 1, characterized in that the coupling point of the second terminal (A2) of the first coil electrode (W1) of the first lamp (Lp3) to the second terminal (A2) of the first coil electrode (W1) of the second lamp (Lp4) is coupled to the supply terminal (Uv).
  11. Circuit arrangement according to Claim 10, characterized in that the first preheating device (L13) is coupled to the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp3), and
    in that the second preheating device (L14) is coupled to the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp4),
    a third diode (D13) being coupled in the forward direction between the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp3) and the first preheating device (L11) ; and
    a fourth diode (D14) being coupled in the forward direction between the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp4) and the second preheating device (L14).
  12. Circuit arrangement according to one of Claims 10 and 11, characterized in that the coupling point of the first terminal (A1) of the first coil electrode (W1) of the first lamp (Lp3) to the first preheating device (L13) and the coupling point of the first terminal (A1) of the first coil electrode (W1) of the second lamp (Lp4) are coupled to an evaluating device (AW1).
  13. Circuit arrangement according to one of Claims 10 to 12, characterized in that the circuit arrangement has a first and a second terminal (A1, A2) for the first coil electrode (W1) of a third lamp (Lp5) and a first and a second terminal (A1, A2) for the second coil electrode (W2) of the third lamp (Lp5), the first terminal (A1) for the first coil electrode (W1) of the third lamp (Lp5) being coupled to an evaluating device;
    the second terminal (A2) for the first coil electrode (W1) of the third lamp (Lp5) being coupled to the supply terminal;
    the first terminal (A1) for the second coil electrode (W2) of the third lamp (Lp5) being coupled to the first terminal (A1) of the second coil electrode (W2) of the first lamp (Lp3); and the second terminal (A2) for the second coil electrode (W2) of the third lamp (Lp5) being coupled to the supply terminal.
  14. Operating method for at least one first and a second lamp (Lp1, Lp2) which in each case have a first and a second coil electrode (W1, W2), at a circuit arrangement comprising
    - a first and a second terminal (A1, A2) for the first coil electrode (W1) of the first lamp (Lp1);
    - a first and a second terminal (A1, A2) for the second coil electrode (W2) of the first lamp (Lp1);
    - a first and a second terminal (A1, A2) for the first coil electrode (W1) of the second lamp (Lp2);
    - a first and a second terminal (A1, A2) for the second coil electrode (W2) of the second lamp (Lp2);
    - at least one supply terminal (Uv) for supplying a supply voltage to the respective first coil electrode (W1) of the at least one first and second lamp (Lp1, Lp2);
    - at least one preheating device (L11, L12) for the respective first coil electrode (W1) of the at least one first and second lamp (Lp1, Lp2);
    the second terminal (A2) of the first coil electrode (W1) of the first lamp (Lp1) being coupled in a coupling point to the second terminal (A2) of the first coil electrode (W1) of the second lamp (Lp2);
    characterized in that
    the preheating device comprises a first preheating inductance (L11) and a second preheating inductance (L12) which are arranged in series with one another, the junction of the first and of the second preheating inductance (L11, L12) being coupled to the coupling point of the second terminal (A2) of the first coil electrode (W1) of the first lamp (Lp1) and of the second terminal (A2) of the first coil electrode (W1) of the second lamp (Lp2).
EP06830350A 2005-12-16 2006-12-05 Circuit arrangement and method for the operation of at least one first and a second lamp Not-in-force EP1961277B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005060345A DE102005060345A1 (en) 2005-12-16 2005-12-16 Circuit arrangement and method for operating at least a first and a second lamp
PCT/EP2006/069300 WO2007068622A1 (en) 2005-12-16 2006-12-05 Circuit arrangement and method for the operation of at least one first and a second lamp

Publications (2)

Publication Number Publication Date
EP1961277A1 EP1961277A1 (en) 2008-08-27
EP1961277B1 true EP1961277B1 (en) 2010-03-31

Family

ID=37796518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06830350A Not-in-force EP1961277B1 (en) 2005-12-16 2006-12-05 Circuit arrangement and method for the operation of at least one first and a second lamp

Country Status (7)

Country Link
US (1) US8067899B2 (en)
EP (1) EP1961277B1 (en)
CN (1) CN101331808B (en)
AT (1) ATE463150T1 (en)
CA (1) CA2633860A1 (en)
DE (2) DE102005060345A1 (en)
WO (1) WO2007068622A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006384A (en) * 1976-01-06 1977-02-01 Westinghouse Electric Corporation Lead-lag, series-sequence starting and operating apparatus for three to six fluorescent lamps
US5422546A (en) * 1978-03-20 1995-06-06 Nilssen; Ole K. Dimmable parallel-resonant electric ballast
US5331253A (en) * 1992-08-24 1994-07-19 Usi Lighting, Inc. Electronic ballast for gaseous discharge lamp operation
DE19634850A1 (en) * 1996-08-28 1998-03-05 Tridonic Bauelemente Electronic ballast for gas discharge lamps
US6326740B1 (en) 1998-12-22 2001-12-04 Philips Electronics North America Corporation High frequency electronic ballast for multiple lamp independent operation
DE10252836A1 (en) * 2002-11-13 2004-05-27 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Device for operating discharge lamps
DE102005001326A1 (en) * 2005-01-11 2006-07-20 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Electronic Ballast (ECG)

Also Published As

Publication number Publication date
CN101331808A (en) 2008-12-24
CN101331808B (en) 2011-12-14
WO2007068622A1 (en) 2007-06-21
US20100072918A1 (en) 2010-03-25
EP1961277A1 (en) 2008-08-27
DE102005060345A1 (en) 2007-06-21
US8067899B2 (en) 2011-11-29
CA2633860A1 (en) 2007-06-21
ATE463150T1 (en) 2010-04-15
DE502006006608D1 (en) 2010-05-12

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