EP0676121A1 - Ballast for at least one pair of gas discharge lamps in parallel. - Google Patents

Ballast for at least one pair of gas discharge lamps in parallel.

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Publication number
EP0676121A1
EP0676121A1 EP93924069A EP93924069A EP0676121A1 EP 0676121 A1 EP0676121 A1 EP 0676121A1 EP 93924069 A EP93924069 A EP 93924069A EP 93924069 A EP93924069 A EP 93924069A EP 0676121 A1 EP0676121 A1 EP 0676121A1
Authority
EP
European Patent Office
Prior art keywords
gas discharge
discharge lamps
connection point
choke
lamp
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.)
Granted
Application number
EP93924069A
Other languages
German (de)
French (fr)
Other versions
EP0676121B1 (en
Inventor
Andreas Schoell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonic Bauelemente GmbH
Original Assignee
Tridonic Bauelemente GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Tridonic Bauelemente GmbH filed Critical Tridonic Bauelemente GmbH
Publication of EP0676121A1 publication Critical patent/EP0676121A1/en
Application granted granted Critical
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—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
    • H05B41/2825—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 by means of a bridge converter in the final stage
    • H05B41/2827—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 by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase

Definitions

  • the invention relates to a ballast for at least one pair of gas discharge lamps operated in parallel according to the preamble of claim 1.
  • ballast technology So far it has been assumed in ballast technology that two separate resonant circuits are also required for 2-lamp operation. This is because it has been assumed that when a common resonant circuit is used for both lamps, after the one lamp has been ignited, the resonant circuit voltage breaks down and is no longer sufficient to ignite the second lamp. As a rule, it can be assumed that both lamps are not the same
  • the invention has for its object that known ballast
  • the ballast according to the invention works with only a single resonant circuit despite the conceptual hindrance described above.
  • the cause apparently lies in the effect of the balancing transformer.
  • the current flowing through this lamp and the associated winding of the balancing transformer causes a voltage in the other winding which is superimposed on the voltage supplied by the resonant circuit (normally the voltages are compensated for by the two windings of the balancing transformer the opposite direction).
  • the above-described superimposition of the voltages on the lamp which has not yet ignited causes the lamp to also ignite.
  • the ignition of the lamp can be controlled by monitoring the lamp current. If it is found that after the first lamp has been ignited, the second Lamp does not ignite, so as before, the frequency of the inverter can be lowered to near the resonance frequency of the resonant circuit, with the result that the ignition voltage on the second lamp, which has not yet ignited, is increased. This then usually leads to the ignition of the second lamp.
  • ballast An exemplary embodiment of a ballast according to the invention is described below with reference to the single drawing.
  • the ballast shown in the drawing has a bridge rectifier G, which is connected to the network. The one generated by the rectifier G.
  • the DC voltage is fed to an inverter W R , which has an asymmetrical output.
  • the inverter W R is supplied with a DC voltage U DC generated by the rectifier G.
  • the inverter W R contains two switch elements connected in opposite directions in a known manner. The switching frequency can be changed. In this way, the inverter WR generates one at its output
  • a series resonant circuit is connected, which consists R and a resonant capacitor CR of a choke L.
  • the alternating voltage dropping across the resonance capacitor C R is supplied to two pairs of lamps L 1 , L 2 and L 3 , L 4 to be supplied via an isolating capacitor C T.
  • the isolating capacitor C T can also be provided between the inverter WR and the reactor LR. It is drawn in dashed lines in the drawing and is drawn with C T with a dash above.
  • a first balancing transformer Tsi is provided for the first pair of lamps L 1 , L 2 , which has two windings W S 1 , W S2 acting in the opposite direction. One end of these two windings is connected to the separating capacitor C T
  • each of the two windings W S1 , W S2 is connected to an electrode of one of the two lamps L 1 , L 2 .
  • the other electrode of the two lamps L 1 , L 2 is connected to ground via a resistor R 1 , R 2 .
  • the current flowing through the lamp L 1 generates a voltage drop U L1 across the resistor R 1 , which is used as a measured variable for the lamp current.
  • a voltage UL drops 2 which is used as a measured variable for the lamp current of the lamp L2.
  • the lamps L 1 and L 2 are heated directly, the two heating filaments being connected by heating capacitors C H1 and C H2 .
  • T S2 provided with two windings W S3 , W S4 acting in opposite directions. Again, the two windings are connected at one end, and the
  • connection point of the two windings is connected via the isolating capacitor C T to the connection point of the choke L R and the resonance capacitor C R.
  • the other ends of the two windings W S3 , W S4 are each connected to one electrode of the two lamps L 3 , L 4 .
  • the other electrodes of the two lamps L 3 , L 4 are directly connected here.
  • the connection point is with a
  • the heating filaments of lamps L 3 , L 4 are heated by means of a heating transformer T H1 , T H2 .
  • a heating transformer T H1 , T H2 an input winding W H1, W H4 of the two heating transformers is supplied with a heating voltage U H.
  • the heating transformer T H1 has two output windings W H2, W H3 , one of which is connected to a heating coil of the lamp L3.
  • the heating transformer T H2 has two output windings W H5, W H6 , each of which is connected to one of the two heating filaments of the lamp L 4 .
  • the frequency of the inverter W R is chosen so that it is relatively far above the resonance frequency of the choke L R and the resonant capacitor C R formed series resonant circuit. In this case, the voltage drop across the resonant capacitor C R is relatively small, so that none of the
  • Lamp of each lamp pair first.
  • the current flowing through the lamp induces in the winding of the corresponding one associated with the other lamp
  • Balancing transformer a voltage that is the ignition voltage of the other
  • Lamp overlaid with the result that the other lamp also ignites. If the other lamp is not ignited, which can be determined for example in the case of the lamps L 1 , L 2 by the voltages U L1 , U L2 , the frequency of the
  • the resonance frequency of the series resonance circuit is approaching. In this way, the ignition of the second lamp is ultimately forced.
  • Lamp pairs only a single series resonance circuit is provided. This measure allows the ballast according to the invention to be manufactured more easily and cheaply than previously.
  • a single balancing transformer (not shown) with four windings can be provided in the present case, two of which each act in opposite directions.

Landscapes

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

Abstract

A ballast for at least one pair of gas discharge lamps in parallel has a rectifier (G) to be connected to the a.c. mains and a converter (WR) connected downstream thereof. A series resonant circuit (LR, CR) is connected to the output of the converter. To the pair of lamps (L1, L2) is allocated a balancing transformer (TS1) having two counteraction windings (WS1, WS2). The two windings are interconnected at one end. The connection point is connected to that of the choke (LR) and of the resonant capacitor (CR) of the series resonant circuit. The other end of the two windings are connected to one electrode of the two lamps (L1, L2).

Description

Vorschaltgerät für mindestens ein parallel betriebenes Gasentladungslampen-Paar  Ballast for at least one pair of gas discharge lamps operated in parallel
Die Erfindung betrifft ein Vorschaltgerät für mindestens ein parallel betriebenes Gasentladungslampen-Paar gemäß Oberbegriff des Anspruches 1. The invention relates to a ballast for at least one pair of gas discharge lamps operated in parallel according to the preamble of claim 1.
Gemäß Figur 6 der EP 0 490 329 AI der Anmelderin ist ein Vorschaltgerät für zwei parallel betriebene Gasentladungslampen bekannt, bei dem dem Wechselrichter zwei Serienresonanzkreise nachgeschaltet sind, von denen je einer einer der beiden According to FIG. 6 of EP 0 490 329 AI by the applicant, a ballast for two gas discharge lamps operated in parallel is known, in which two series resonance circuits are connected downstream of the inverter, one of which is one of the two
Gasentladungslampen zugeordnet ist. Gas discharge lamps is assigned.
Bisher ist man in der Vorschaltgeräte-Technik davon ausgegangen, daß bei einem 2- Lampenbetrieb auch zwei separate Schwingkreise erforderlich sind. Dies deshalb, weil man angenommen hat, daß bei Verwendung eines gemeinsamen Schwingkreises für beide Lampen nach dem Zünden der einen Lampe die Schwingkreisspannung zusammenbricht und nicht mehr zur Zündung der zweiten Lampe ausreicht. In der Regel kann davon ausgegangen werden, daß beide Lampen nicht zum gleichen So far it has been assumed in ballast technology that two separate resonant circuits are also required for 2-lamp operation. This is because it has been assumed that when a common resonant circuit is used for both lamps, after the one lamp has been ignited, the resonant circuit voltage breaks down and is no longer sufficient to ignite the second lamp. As a rule, it can be assumed that both lamps are not the same
Zeitpunkt zündwillig sind. Are timed to fire.
Der Erfindung liegt die Aufgabe zugrunde, daß bekannte Vorschaltgerät zu The invention has for its object that known ballast
vereinfachen. simplify.
Die Aufgabe ist durch die im Kennzeichen des Anspruches 1 angegebenen Merkmale gelöst. Es war überraschend, daß das erfindungsgemäße Vorschaltgerät trotz des oben beschriebenen gedanklichen Hinderungsgrundes mit nur einem einzigen Schwingkreis funktioniert. Die Ursache liegt offenbar in der Wirkung des Symmetriertransformators. Wenn die eine Lampe gezündet hat, so verursacht der durch diese Lampe und die zugeordnete Wicklung des Symmetriertransformators fließende Strom in der anderen Wicklung eine Spannung, die sich mit der vom Schwingkreis gelieferten Spannung überlagert (normalerweise kompensieren sich die Spannungungen durch die beiden Wicklungen des Symmetriertransformators wegen der Gegensinnigkeit). Durch die vorstehend geschilderte Überlagerung der Spannungen an derjenigen Lampe, die noch nicht gezündet hat, wird diese veranlaßt, ebenfalls zu zünden. The object is achieved by the features specified in the characterizing part of claim 1. It was surprising that the ballast according to the invention works with only a single resonant circuit despite the conceptual hindrance described above. The cause apparently lies in the effect of the balancing transformer. When one lamp has ignited, the current flowing through this lamp and the associated winding of the balancing transformer causes a voltage in the other winding which is superimposed on the voltage supplied by the resonant circuit (normally the voltages are compensated for by the two windings of the balancing transformer the opposite direction). The above-described superimposition of the voltages on the lamp which has not yet ignited causes the lamp to also ignite.
Das Zünden der Lampe kann durch Überwachung des Lampenstromes kontrolliert werden. Wenn festgestellt wird, daß nach dem Zünden der ersten Lampe die zweite Lampe nicht zündet, so kann, wie bisher auch, die Frequenz des Wechselrichters bis in die Nähe der Resonanzfrequenz des Resonanzkreises abgesenkt werden, mit der Folge, daß die Zündspannung an der zweiten Lampe, die noch nicht gezündet hat, erhöht wird. Dies führt dann in der Regel auch zur Zündung der zweiten Lampe. The ignition of the lamp can be controlled by monitoring the lamp current. If it is found that after the first lamp has been ignited, the second Lamp does not ignite, so as before, the frequency of the inverter can be lowered to near the resonance frequency of the resonant circuit, with the result that the ignition voltage on the second lamp, which has not yet ignited, is increased. This then usually leads to the ignition of the second lamp.
Wenn mit einem Vorschaltgerät mehr als ein Lampenpaar im Parallelbetrieb betrieben werden soll, so besteht die Möglichkeit, für alle Lampen-Paare entweder einen gemeinsamen Symmetriertransformator mit einer entsprechenden Anzahl von If more than one pair of lamps is to be operated in parallel with a ballast, it is possible to use a common balancing transformer with a corresponding number of for all lamp pairs
Wicklungs-Paaren mit gegensinnig wirkenden Wicklungen vorzusehen oder aber für jedes Lampen-Paar einen separaten Symmetriertransformator mit zwei gegensinnig wirkenden Wicklungen. To provide pairs of windings with oppositely acting windings or, for each pair of lamps, a separate balancing transformer with two oppositely acting windings.
Dies ist Gegenstand der Ansprüche 2 und 3. Weitere Ausgestaltungen der Erfindung sind in den Ansprüchen 3 bis 9 angegeben. This is the subject of claims 2 and 3. Further developments of the invention are given in claims 3 to 9.
Ein Ausführungsbeispiel für ein erfindungsgemäßes Vorschaltgerät wird nachfolgend anhand der einzigen Zeichnung beschrieben. Das in der Zeichnung dargestellte Vorschaltgerät weist einen Brückengleichrichter G auf, der mit dem Netz verbunden ist. Die von dem Gleichrichter G erzeugte An exemplary embodiment of a ballast according to the invention is described below with reference to the single drawing. The ballast shown in the drawing has a bridge rectifier G, which is connected to the network. The one generated by the rectifier G.
Gleichspannung wird einem Wechselrichter WR zugeführt, der einen asymmetrischen Ausgang aufweist. Der Wechselrichter WR wird mit einer vom Gleichrichter G erzeugten Gleichspannung UDC versorgt. Der Wechselrichter WR enthält in bekannter Weise zwei gegensinnig geschaltete Schalterelemente. Die Schaltfrequenz ist veränderbar. Auf diese Weise erzeugt der Wechselrichter WR an seinem Ausgang eineDC voltage is fed to an inverter W R , which has an asymmetrical output. The inverter W R is supplied with a DC voltage U DC generated by the rectifier G. The inverter W R contains two switch elements connected in opposite directions in a known manner. The switching frequency can be changed. In this way, the inverter WR generates one at its output
Wechselspannung variabler Frequenz. AC voltage of variable frequency.
Mit dem Ausgang des Wechselrichters WR ist ein Serienresonanzkreis verbunden, der aus einer Drossel LR und einem Resonanzkondensator CR besteht. To the output of the inverter W R is a series resonant circuit is connected, which consists R and a resonant capacitor CR of a choke L.
Die über dem Resonanzkondensator CR abfallende Wechselspannung wird über einen Trennkondensator CT zwei zu versorgenden Lampen-Paaren L1 , L2 und L3, L4 zugeführt. Der Trennkondensator CT kann auch zwischen dem Wechselrichter WR und der Drossel LR vorgesehen werden. Er ist in der Zeichnung in gestrichelten Linien eingezeichnet und mit CT mit oben einem Strich eingezeichnet. Für das erste Lampen-Paar L1 , L2 ist ein erster Symmetriertransformator Tsi vorgesehen, der zwei gegerismnig wirkende Wicklungen WS 1 , WS2 hat. Das eine Ende dieser beiden Wicklungen ist über den Trennkondensator CT mit dem The alternating voltage dropping across the resonance capacitor C R is supplied to two pairs of lamps L 1 , L 2 and L 3 , L 4 to be supplied via an isolating capacitor C T. The isolating capacitor C T can also be provided between the inverter WR and the reactor LR. It is drawn in dashed lines in the drawing and is drawn with C T with a dash above. A first balancing transformer Tsi is provided for the first pair of lamps L 1 , L 2 , which has two windings W S 1 , W S2 acting in the opposite direction. One end of these two windings is connected to the separating capacitor C T
Nerbindungspunkt der Drossel LR und des Resonanzkondensators CR verbunden. Das andere Ende jeder der beiden Wicklungen WS1, WS2 ist mit einer Elektrode einer der beiden Lampen L1 , L2 verbunden. Die andere Elektrode der beiden Lampen L1 , L2 ist über je einen Widerstand R1 , R2 mit Masse verbunden. Der durch die Lampe L1 fließende Strom erzeugt an dem Widerstand R1 einen Spannungsabfall UL1, die als Meßgröße für den Lampenstrom verwendet wird. Über den Widerstand R2 fällt eine Spannung UL2 ab, die als Meßgröße für den Lampenstrom der Lampe L2 verwendet wird. Connection point of the choke L R and the resonance capacitor C R connected. The other end of each of the two windings W S1 , W S2 is connected to an electrode of one of the two lamps L 1 , L 2 . The other electrode of the two lamps L 1 , L 2 is connected to ground via a resistor R 1 , R 2 . The current flowing through the lamp L 1 generates a voltage drop U L1 across the resistor R 1 , which is used as a measured variable for the lamp current. Via the resistor R 2, a voltage UL drops 2, which is used as a measured variable for the lamp current of the lamp L2.
Die Lampen L1 und L2 sind direkt geheizt, wobei die beiden Heizwendeln durch Heizkondensatoren C H1 bzw. C H2 verbunden sind. The lamps L 1 and L 2 are heated directly, the two heating filaments being connected by heating capacitors C H1 and C H2 .
Für das zweite Lampen-Paar L3, L4 ist ebenfalls ein separater SymmetriertransformatorFor the second pair of lamps L 3 , L 4 there is also a separate balancing transformer
TS2 mit zwei gegensinnig wirkenden Wicklungen WS3, WS4 vorgesehen. Auch hier sind die beiden Wicklungen an einem Ende miteinander verbunden, und der T S2 provided with two windings W S3 , W S4 acting in opposite directions. Again, the two windings are connected at one end, and the
Verbindungspunkt der beiden Wicklungen ist über den Trennkondensator CT mit dem Nerbindungspunkt der Drossel LR und dem Resonanzkondensator CR verbunden. Die anderen Enden der beiden Wicklungen WS3, WS4 sind mit je einer Elektrode der beiden Lampen L3, L4 verbunden. Die anderen Elektroden der beiden Lampen L3, L4 sind hier direkt miteinander verbunden. Der Verbindungspunkt ist mit einem The connection point of the two windings is connected via the isolating capacitor C T to the connection point of the choke L R and the resonance capacitor C R. The other ends of the two windings W S3 , W S4 are each connected to one electrode of the two lamps L 3 , L 4 . The other electrodes of the two lamps L 3 , L 4 are directly connected here. The connection point is with a
Verbindungspunkt von zwei Symmetrierkondensatoren CS1 , CS2 verbunden, die zwischen Masse und dem Gleichspannungspotential U DC des Wechselrichters WR in Serie geschaltet sind. Connection point of two balancing capacitors C S1 , C S2 connected, which are connected in series between ground and the DC voltage potential U DC of the inverter W R.
Im Gegensatz zu den Lampen L1, L2 werden die Heizwendeln der Lampen L3, L4 mittels eines Heiztransformators T H1 , T H2 geheizt. Dazu wird eine Eingangswicklung W H1, WH4 der beiden Heiztransformatoren einer Heizspannung U H zugeführt. Der Heiztransformator T H1 weist zwei Ausgangswicklungen W H2, W H3 auf, von denen jeweils einer mit einer Heizwendel der Lampe L3 verbunden ist. Der Heiztransformator T H2 weist zwei Ausgangswicklungen W H5, W H6 auf, die mit jeweils einer der beiden Heizwendeln der Lampe L4 verbunden sind. In contrast to lamps L 1 , L 2 , the heating filaments of lamps L 3 , L 4 are heated by means of a heating transformer T H1 , T H2 . For this purpose, an input winding W H1, W H4 of the two heating transformers is supplied with a heating voltage U H. The heating transformer T H1 has two output windings W H2, W H3 , one of which is connected to a heating coil of the lamp L3. The heating transformer T H2 has two output windings W H5, W H6 , each of which is connected to one of the two heating filaments of the lamp L 4 .
Nach dem Einschalten des Vorschaltgerätes wird die Frequenz des Wechselrichters WR so gewählt, daß sie relativ weit über der Resonanzfrequenz des von der Drossel LR und dem Resonanzkondensator CR gebildeten Serienresonanzkreises liegt. In diesem Fall ist der Spannungsabfall über dem Resonanzkondensator CR relativ gering, so daß keine derAfter switching on the ballast, the frequency of the inverter W R is chosen so that it is relatively far above the resonance frequency of the choke L R and the resonant capacitor C R formed series resonant circuit. In this case, the voltage drop across the resonant capacitor C R is relatively small, so that none of the
Lampen zünden kann. In diesem Zustand werden die Heizwendeln der Lampen jedoch vorgewärmt (dies gilt insbesondere für die Lampen L1 , L2). Nach dem Vorwärmen der Heizwindeln wird die Frequenz des Wechselrichters WR abgesenkt mit der Folge, daß die Spannung an dem Resonanzkondensator umso mehr steigt, je näher die Frequenz des Wechselrichters WR sich der Resonanzfrequenz des Serienresonanzkreises nähert.Can ignite lamps. In this state, however, the heating filaments of the lamps are preheated (this applies in particular to lamps L 1 , L 2 ). After preheating the heating diapers, the frequency of the inverter W R is lowered, with the result that the voltage at the resonance capacitor increases the closer the frequency of the inverter W R approaches the resonance frequency of the series resonance circuit.
Wenn die Spannung an dem Resonanzkondensator CR genügend hoch ist, zündet eineIf the voltage across the resonance capacitor C R is sufficiently high, one ignites
Lampe jedes Lampen-Paares zuerst. Der durch die Lampe fließende Strom induziert in der der anderen Lampe zugeordneten Wicklung des entsprechenden Lamp of each lamp pair first. The current flowing through the lamp induces in the winding of the corresponding one associated with the other lamp
Symmetriertransformators eine Spannung, die sich der Zündspannung der anderen Balancing transformer a voltage that is the ignition voltage of the other
Lampe überlagert, mit der Folge, daß auch die andere Lampe zündet. Erfolgt keine Zündung der anderen Lampe, was beispielsweise im Falle der Lampen L1, L2 durch die Spannungen UL1, UL2 festgestellt werden kann, so wird die Frequenz des Lamp overlaid, with the result that the other lamp also ignites. If the other lamp is not ignited, which can be determined for example in the case of the lamps L 1 , L 2 by the voltages U L1 , U L2 , the frequency of the
Wechselrichters WR noch weiter abgesenkt, so daß sie sich noch mehr der Inverter W R lowered even further, so that they are even more
Resonanzfrequenz des Serienresonanzkreises nähert. Auf diese Weise wird letztendlich auch die Zündung der jeweils zweiten Lampe erzwungen.  The resonance frequency of the series resonance circuit is approaching. In this way, the ignition of the second lamp is ultimately forced.
Wesentlich ist, daß für die zwei Lampen jedes Lampenpaares bzw. für beide It is essential that for the two lamps of each pair of lamps or for both
Lampenpaare nur ein einziger Serienresonanzkreis vorgesehen ist. Diese Maßnahme erlaubt es, daß erfindungsgemäße Vorschaltgerät einfacher und billiger als bisher herzustellen. Lamp pairs only a single series resonance circuit is provided. This measure allows the ballast according to the invention to be manufactured more easily and cheaply than previously.
Statt der in der Zeichnung dargestellten zwei Symmetriertransformatoren kann auch ein einziger Symmetriertransformator (nicht dargestellt) mit im vorliegenden Fall vier Wicklungen vorgesehen werden, von denen jeweils zwei gegensinnig wirkend sind. Instead of the two balancing transformers shown in the drawing, a single balancing transformer (not shown) with four windings can be provided in the present case, two of which each act in opposite directions.

Claims

PATENTANSPRÜCHE PATENT CLAIMS
1. Vorschaltgerät für mindestens ein parallel betriebenes Gasentladungslampen-Paar, bestehend aus einem an das Wechselstromnetz anzuschließenden Gleichrichter, einem diesem nachgeschalteten Wechselrichter, einem Symmetriertransformator mit zwei gegensinnig wirkenden Wicklungen, die an einem Ende miteinander verbunden sind und deren anderes Ende mit einer Elektrode einer der beiden Gasentladungslampen verbunden sind, wobei die anderen Elektroden der beiden Gasentladungslampen miteinander verbunden sind, 1. Ballast for at least one pair of gas discharge lamps operated in parallel, consisting of a rectifier to be connected to the AC network, an inverter connected downstream thereof, a balun with two oppositely acting windings which are connected to one another at one end and the other end of which is connected to an electrode of one of the two gas discharge lamps are connected, the other electrodes of the two gas discharge lamps being connected to one another,
dadurch gekennzeichnet,  characterized,
daß dem Ausgang des Wechselrichters (WR) für beide Gasentladungslampen (L1 , L2) nur ein von einer Drossel (LR) und einem Resonanzkondensator (CR) gebildeterthat the output of the inverter (W R ) for both gas discharge lamps (L 1 , L 2 ) only one formed by a choke (L R ) and a resonance capacitor (C R )
Serienschwingkreis nachgeschaltet ist, und daß der Verbindungspunkt der beiden Wicklungen (WS 1 , WS2) des Symmetriertransformators (TS 1) wechselstrommäßig mit dem Verbindungspunkt der Drossel (LR) und des einen ResonanzkondensatorsSeries resonant circuit is connected downstream, and that the connection point of the two windings (W S 1 , W S2 ) of the balancing transformer (T S 1 ) in terms of alternating current with the connection point of the choke (L R ) and one resonance capacitor
(CR) verbunden ist. (C R ) is connected.
2. Vorschaltgerät nach Anspruch 1, 2. Ballast according to claim 1,
dadurch gekennzeichnet, daß zur Versorgung weiterer parallel betriebener  characterized in that to supply other parallel operated
Gasentladungslampen-Paare (L3,L4) für jedes Lampen-Paar (L1,L2;L3,L4) ein separater Symmetriertransformator (TS1;TS2) mit zwei gegensinnig wirkendenGas discharge lamp pairs (L 3 , L 4 ) for each lamp pair (L 1 , L 2 ; L 3 , L 4 ) a separate balancing transformer (T S1 ; T S2 ) with two counter-acting
Wicklungen (WS1,WS2;WS3,WS 4) vorgesehen ist, die an einem Ende jeweils miteinander verbunden sind und deren jeweils anderes Ende mit einer Elektrode der beiden Gasentladungslampen (L1,L2;L3,L4) des betreffenden Lampen-Paares verbunden sind, wobei die anderen Elektroden der beiden Gasentladungslampen miteinander verbunden sind, daß dem Ausgang des Wechselrichters (WR) für beideWindings (W S1 , W S2 ; W S3 , W S 4 ) are provided, which are each connected at one end and the other end of which is connected to an electrode of the two gas discharge lamps (L 1 , L 2 ; L 3 , L 4 ) of the relevant pair of lamps are connected, the other electrodes of the two gas discharge lamps being connected to each other, that the output of the inverter (W R ) for both
Lampen-Paare (L1,L2;L3,L4) nur ein von einer Drossel (LR) und einem Lamp pairs (L 1 , L 2 ; L 3 , L 4 ) only one of a choke (L R ) and one
Resonanzkondensator (CR) gebildeter Serienschwingkreis nachgeschaltet ist, und daß der Verbindungspunkt der beiden Wicklungen (WS 1,WS2;WS3,WS4) jedes Resonant capacitor (C R ) formed series resonant circuit is connected downstream, and that the connection point of the two windings (W S 1 , W S2 ; W S3 , W S4 ) each
Symmetrietransformators (TS 1,TS2) wechselstrommäßig mit dem Verbindungspunkt der Drossel (LR) und des Resonanzkondensators (CR) verbunden ist. Symmetry transformer (T S 1 , T S2 ) is alternatingly connected to the connection point of the choke (L R ) and the resonance capacitor (C R ).
3. Vorschaltgerät nach Anspruch 1, 3. Ballast according to claim 1,
dadurch gekennzeichnet,  characterized,
daß zur Versorgung weiterer parallel betriebener Gasentladungslampen-Paare that to supply further pairs of gas discharge lamps operated in parallel
(L3,L4) für alle Lampen-Paare ein einziger Symmetriertransformator mit einer der(L 3 , L 4 ) for all lamp pairs a single balancing transformer with one of the
Gesamtzahl der Lampen-Paare gleichen Anzahl von Wicklungs-Paaren mit gegensinnig wirkenden Wicklungen vorgesehen ist, die an einem Ende alle miteinander verbunden sind und deren anderes Ende mit einer Elektrode einer der beiden Gasentladungslampen des zugeordneten Lampen-Paares verbunden sind, wobei die anderen Elektroden der beiden Gasentladungslampen des zugeordneten Lampen-Paares miteinander verbunden sind, daß dem Ausgang des WechselrichtersTotal number of lamp pairs with the same number of winding pairs oppositely acting windings are provided, all of which are connected to one another and the other end of which are connected to an electrode of one of the two gas discharge lamps of the associated pair of lamps, the other electrodes of the two gas discharge lamps of the associated pair of lamps being connected to one another in that the output of the inverter
(WR) für alle Lampen-Paare nur ein von einer Drossel (LR) und einem (W R ) for all lamp pairs only one of a choke (L R ) and one
Resonanzkondensator (CR) gebildeter Serienschwingkreis nachgeschaltet ist, und daß der Verbindungspunkt der Wicklungen des gemeinsamen Symmetriertransformators wechselstrommäßig mit dem Verbindungspunkt der Drossel (LR) und des Resonant capacitor (C R ) formed series resonant circuit is connected downstream, and that the connection point of the windings of the common balun transformer AC with the connection point of the choke (L R ) and the
Resonanzkondensators (CR) verbunden ist. Resonance capacitor (C R ) is connected.
4. Vorschaltgerät nach einem der vorhergehenden Ansprüche, 4. Ballast according to one of the preceding claims,
dadurch gekennzeichnet,  characterized,
daß ein Ausgangsanschluß des Wechselrichters (WR) auf einem Bezugspotential (Masse) liegt, und daß das der Drossel (LR) abgewandte Ende des that an output terminal of the inverter (W R ) is at a reference potential (ground), and that the end of the choke (L R ) facing away
Resonanzkondensators (CR) ebenfalls auf dem Bezugspotential (Masse) liegt. Resonance capacitor (C R ) is also at the reference potential (ground).
5. Vorschaltgerät nach Anspruch 1, 5. Ballast according to claim 1,
dadurch gekennzeichnet,  characterized,
daß die miteinander verbundenen anderen Elektroden der beiden  that the interconnected other electrodes of the two
Gasentladungslampen des oder jedes Lampen-Paares (L1,L2) direkt oder durchGas discharge lamps of the or each lamp pair (L 1 , L 2 ) directly or through
Zwischenschaltung von Widerständen mit dem Bezugspotential (Masse) verbunden sind. Interposition of resistors are connected to the reference potential (ground).
6. Vorschaltgerät nach Anspruch 4, 6. Ballast according to claim 4,
dadurch gekennzeichnet,  characterized,
daß die miteinander verbundenen anderen Elektroden der beiden  that the interconnected other electrodes of the two
Gasentladungslampen des oder jedes Lampen-Paares ( L3 , L4) direkt oder unterGas discharge lamps of the or each lamp pair (L 3 , L 4 ) directly or below
Zwischenschaltung von Widerständen mit dem Verbindungspunkt von zwei in Serie geschalteten Symmetrierkondensatoren (CS 1 , CS2) verbunden sind, daß der demInterposition of resistors are connected to the connection point of two series-connected balancing capacitors (C S 1 , C S2 ) that the
Verbindungspunkt abgewandte Anschluß des einen Symmetrierkondensators (CS2) auf dem Bezugspotential (Masse) liegt, und daß der dem Verbindungspunkt abgewandte Anschluß des anderen Symmetrierkondensators (CS 1) auf dem Connection point facing away from the one balancing capacitor (C S2 ) is at the reference potential (ground), and that the connection facing away from the connecting point of the other balancing capacitor (C S 1 ) on the
Versorgungs-Gleichspannungspotential (UDC) des Wechselrichters (WR) liegt. DC supply potential (U DC ) of the inverter (WR) is.
7. Vorschaltgerät nach einem der vorherstehenden Ansprüche, 7. Ballast according to one of the preceding claims,
dadurch gekennzeichnet, daß der Verbindungspunkt zwischen den beiden gegensinnig wirkenden Wicklungen des oder jedes Symmetriertransformators mit dem Verbindungspunkt der Drossel (LR) und des Resonanzkondensators (CR) über einen Trennkondensator (CT) verbunden ist. characterized, that the connection point between the two oppositely acting windings of the or each balancing transformer is connected to the connection point of the inductor (L R ) and the resonance capacitor (C R ) via an isolating capacitor (C T ).
8. Vorschaltgerät nach einem der vorherstehenden Ansprüche, 8. Ballast according to one of the preceding claims,
dadurch gekennzeichnet,  characterized,
daß die Drossel (LR) direkt mit dem Wechselrichter (WR) verbunden ist. that the choke (L R ) is connected directly to the inverter (W R ).
9. Vorschaltgerät nach einem der vorherstehenden Ansprüche, 9. ballast according to one of the preceding claims,
dadurch gekennzeichnet,  characterized,
daß die Drossel (LR) über einen Trennkondensator (CT) mit dem Wechselrichterthat the choke (L R ) via a separation capacitor (C T ) with the inverter
(WR) verbunden ist. (W R ) is connected.
EP93924069A 1992-12-23 1993-10-28 Ballast for at least one pair of gas discharge lamps in parallel Expired - Lifetime EP0676121B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4243955 1992-12-23
DE4243955A DE4243955B4 (en) 1992-12-23 1992-12-23 Ballast for at least one parallel-operated pair of gas discharge lamps
PCT/EP1993/002995 WO1994015444A1 (en) 1992-12-23 1993-10-28 Ballast for at least one pair of gas discharge lamps in parallel

Publications (2)

Publication Number Publication Date
EP0676121A1 true EP0676121A1 (en) 1995-10-11
EP0676121B1 EP0676121B1 (en) 1997-01-22

Family

ID=6476455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93924069A Expired - Lifetime EP0676121B1 (en) 1992-12-23 1993-10-28 Ballast for at least one pair of gas discharge lamps in parallel

Country Status (9)

Country Link
EP (1) EP0676121B1 (en)
AT (1) ATE148297T1 (en)
AU (1) AU5371594A (en)
DE (2) DE4243955B4 (en)
ES (1) ES2097550T3 (en)
FI (1) FI111791B (en)
NO (1) NO308690B1 (en)
WO (1) WO1994015444A1 (en)
ZA (1) ZA939579B (en)

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Also Published As

Publication number Publication date
NO952517L (en) 1995-06-22
FI952655A0 (en) 1995-05-31
ES2097550T3 (en) 1997-04-01
DE4243955A1 (en) 1994-06-30
NO308690B1 (en) 2000-10-09
ZA939579B (en) 1994-08-11
WO1994015444A1 (en) 1994-07-07
ATE148297T1 (en) 1997-02-15
NO952517D0 (en) 1995-06-22
DE4243955B4 (en) 2010-11-18
AU5371594A (en) 1994-07-19
FI952655A (en) 1995-05-31
FI111791B (en) 2003-09-15
EP0676121B1 (en) 1997-01-22
DE59305294D1 (en) 1997-03-06

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