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EP0123963A2 - Circuit arrangement for controlling the intensity of the light of fluorescent lamps - Google Patents

Circuit arrangement for controlling the intensity of the light of fluorescent lamps Download PDF

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Publication number
EP0123963A2
EP0123963A2 EP84103836A EP84103836A EP0123963A2 EP 0123963 A2 EP0123963 A2 EP 0123963A2 EP 84103836 A EP84103836 A EP 84103836A EP 84103836 A EP84103836 A EP 84103836A EP 0123963 A2 EP0123963 A2 EP 0123963A2
Authority
EP
European Patent Office
Prior art keywords
ignition
fluorescent lamps
circuit arrangement
controlling
dimmer
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.)
Withdrawn
Application number
EP84103836A
Other languages
German (de)
French (fr)
Other versions
EP0123963A3 (en
Inventor
Robert Zapp
Bang Bui-Huu
Gerhard Clever
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.)
BBC Brown Boveri AG Germany
Original Assignee
BBC Brown Boveri AG Germany
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri AG Germany filed Critical BBC Brown Boveri AG Germany
Publication of EP0123963A2 publication Critical patent/EP0123963A2/en
Publication of EP0123963A3 publication Critical patent/EP0123963A3/en
Withdrawn legal-status Critical Current

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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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3924—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by phase control, e.g. using a triac

Definitions

  • the invention relates to a circuit arrangement for controlling the brightness of a fluorescent lamp or a plurality of fluorescent lamps according to the preamble of claim 1.
  • the known circuit arrangements are well suited for controlling the fluorescent lamps with a diameter of 38 mm that have been in use for many years. In More recently, fluorescent lamps with a diameter of 26 mm are also used. The brightness of fluorescent lamps with a diameter of 26 mm cannot be easily controlled with the known circuit arrangements, since they have a higher ignition voltage compared to fluorescent lamps with a diameter of 38 mm, which the known circuit arrangements do not or cannot reliably achieve.
  • the invention is based on the object of specifying a circuit arrangement for controlling the brightness of fluorescent lamps with an increased ignition voltage, it being possible to continue using the previously used standard components.
  • the invention advantageously makes it possible to continue using existing standard components for brightness control when converting lamps with a diameter of 38 mm to lamps with increased ignition voltage.
  • An ignition device only needs to be installed.
  • a circuit arrangement for brightness control of fluorescent lamps is shown.
  • This circuit arrangement is based on a conventional arrangement of a fluorescent lamp 7 with a ballast 2, a heating transformer 4 for preheating the electrodes 9 of the fluorescent lamp 7, a dimmer 1 and a base load device 3.
  • the Netzspan voltage with the phase L and the neutral conductor N is connected via the ballast 2 to one of the electrodes 9 of the fluorescent lamp 7 and also to the S connection of the base load device 3.
  • the output L1 of the dimmer 1, which is in the dimmer 1 via a switch with the phase L is connected to a first connection of the primary winding of the heating transformer 4 and to the L1 connection of the base load device 3.
  • the neutral conductor N leads to the N connection of the base load device 3, to a second connection of the primary winding of the heating transformer 4 and to the electrode 9 of the fluorescent lamp 7 which is not connected to the ballast 2.
  • the secondary windings of the heating transformer 4 are each connected to the electrodes 9.
  • the basic load device 3 includes an inductive load, which is connected to the terminals N and S, and a radio interference suppression capacitor between the L1 and the N - terminal.
  • an incandescent lamp load eg 25W
  • the outputs L1 and N of the dimmer 1 are switched, which results in better control properties when using fluorescent lamps 7 with a diameter of 26 mm than when using a base load device 3.
  • the known ignition aid in the form of an ignition strip or a screen grid 5 can also be used advantageously for fluorescent lamps 7 with a diameter of 26 mm to improve the control properties.
  • Such screen grids 5 are connected to earth PE or to the neutral conductor N via a protective resistor 8.
  • an ignition device 6 is additionally according to the invention intended.
  • the ignition device 6 supplies synchronous ignition pulses to increase the phase gating voltage at the output S of the dimmer 1, which are fed to the electrodes 9 of the fluorescent lamp 7.
  • the ignition device 6 contains a series connection of a phase control evaluation 61, a switch-on delay 62, an interference pulse blanking 63, a pulse amplifier 64, an ignition pulse generator 65 and an ignition pulse transformer 66.
  • a power supply unit 67 is also provided for supplying the aforementioned components.
  • phase gating evaluation 61 The input of the phase gating evaluation 61 is connected to the controlled output S of the dimmer 1.
  • a square wave signal (e.g. 12V) is generated with Zener diodes, the rising edge of which runs synchronously with the phase control of the positive half-waves at the input.
  • a timing element only releases this square-wave signal about 4 ms after the mains voltage has passed zero.
  • the square-wave signal therefore appears at the output of the phase gating evaluation 61 in synchronism with the rise in the cut voltage, with the exception of the gating area below 4 ms, in that a voltage rise triggers a square-wave signal only 4 ms after the zero crossing.
  • the square-wave signals generated by the phase gating evaluation 61 then pass through the switch-on delay 62.
  • the square-wave signals are blocked therein within the first 2 seconds after the dimmer 1 has been switched on. This delay time results from the preheating time which is expedient to be observed in order to protect the electrodes 9.
  • the square-wave signals at the output of the interference pulse blanking 63 are then amplified in a transistor circuit in the pulse amplifier 64 and fed via a fiber-carrying thyristors in the ignition pulse generator 65.
  • the ignition pulse generator 65 is supplied with the mains voltage and contains two thyristors and two capacitors, which are charged to + 300V and -300V. Controlled by the square-wave signals from the pulse amplifier 64, the thyristors discharge the capacitors via the primary winding of the ignition pulse transformer 66. On the secondary side of the ignition pulse transformer 66, ignition pulses of approximately 1.5 kV are generated, which are applied to the electrodes 9 of the fluorescent lamp 7 via a capacitor 68. The duration of the ignition pulses is such that flicker-free operation of the fluorescent lamp 7 is ensured.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
  • Optical Head (AREA)

Abstract

In order also to be able to control the brightness of fluorescent lamps with an increased ignition voltage (e.g. lamps with a 26 mm diameter) using a conventional dimmer circuit, the additional arrangement of an ignition unit (6) is proposed which supplies ignition pulses which are synchronised to the rise of the chopped alternating voltage. The ignition device (6) is connected on the input side to the outputs of a dimmer (1) and on the output side to the electrodes (9) of a fluorescent lamp (7). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Schaltungsanordnung zur Helligkeitssteuerung einer Leuchtstofflampe oder mehrerer Leuchtstofflampen nach dem Oberbegriff des Anspruchs 1.The invention relates to a circuit arrangement for controlling the brightness of a fluorescent lamp or a plurality of fluorescent lamps according to the preamble of claim 1.

Solche Schaltungsanordnungen zur Steuerung von Leuchtstofflampen nach dem Prinzip der Phasenanschnittsteuerung unter Verwendung eines Dimmers sind allgemein bekannt und sind in dem BBC-Fachbuch "Vorschaltgeräte und Schaltungen für Niederspannungsentladungslampen", Verlag Girardet, Essen, 5. Auflage 1974 beschrieben. Dort sind auch sämtliche für solche Schaltungen notwendigen Anlagenteile beschrieben, auch Spezialvorschaltgeräte und Spezialheiztransformatoren, die anstelle der Standardkomponenten eingesetzt werden können.Such circuit arrangements for controlling fluorescent lamps according to the principle of phase control using a dimmer are generally known and are described in the BBC specialist book "Ballasts and Circuits for Low-Voltage Discharge Lamps", published by Girardet, Essen, 5th edition 1974. All of the system components required for such circuits are also described there, including special ballasts and special heating transformers that can be used instead of the standard components.

Die bekannten Schaltungsanordnungen sind gut geeignet zur Steuerung der seit vielen Jahren gebräuchlichen Leuchtstofflampen mit einem Durchmesser von 38mm. In neuerer Zeit werden außerdem Leuchtstofflampen mit 26mm Durchmesser verwendet. Leuchtstofflampen mit 26mm Durchmesser lassen sich mit den bekannten Schaltungsanordnungen nicht ohne weiteres in ihrer Helligkeit steuern, da sie eine im Vergleich zu Leuchtstofflampen mit 38mm Durchmesser höhere Zündspannung aufweisen, die mit den bekannten Schaltungsanordnungen nicht oder nicht zuverlässig erreicht wird.The known circuit arrangements are well suited for controlling the fluorescent lamps with a diameter of 38 mm that have been in use for many years. In More recently, fluorescent lamps with a diameter of 26 mm are also used. The brightness of fluorescent lamps with a diameter of 26 mm cannot be easily controlled with the known circuit arrangements, since they have a higher ignition voltage compared to fluorescent lamps with a diameter of 38 mm, which the known circuit arrangements do not or cannot reliably achieve.

Der Erfindung liegt die Aufgabe zugrunde, eine Schaltungsanordnung zur Helligkeitssteuerung von Leuchtstofflampen mit erhöhter Zündspannung anzugeben, wobei eine Weiterverwendung der bisher gebräuchlichen Standardkomponenten möglich sein soll.The invention is based on the object of specifying a circuit arrangement for controlling the brightness of fluorescent lamps with an increased ignition voltage, it being possible to continue using the previously used standard components.

Diese Aufgabe wird durch eine Schaltungsanordnung nach dem Anspruch 1 gelöst. Ausgestaltungen sind in einem Unteranspruch angegeben.This object is achieved by a circuit arrangement according to claim 1. Refinements are specified in a subclaim.

Die Erfindung ermöglicht in vorteilhafter Weise die Weiterverwendung vorhandener Standardkomponenten zur Helligkeitssteuerung, wenn eine Umrüstung von Lampen mit 38mm Durchmesser auf Lampen mit erhöhter Zündspannung erfolgt. Es muß lediglich zusätzlich ein Zündgerät installiert werden.The invention advantageously makes it possible to continue using existing standard components for brightness control when converting lamps with a diameter of 38 mm to lamps with increased ignition voltage. An ignition device only needs to be installed.

Ein Ausführungsbeispiel wird nachstehend anhand der Zeichnung beschrieben.An embodiment is described below with reference to the drawing.

In der Zeichnung ist eine Schaltungsanordnung zur Helligkeitssteuerung von Leuchtstofflampen dargestellt. Diese Schaltungsanordnung geht zunächst von einer üblichen Anordnung einer Leuchtstofflampe 7 mit einem Vorschaltgerät 2, einem Heiztransformator 4 zur Vorheizung der Elektroden 9 der Leuchtstofflampe 7, einem Dimmer 1 und einem Grundlastgerät 3 aus. Dabei ist die Netzspannung mit der Phase L und dem Nulleiter N zum Eingang des Dimmers 1 geführt. Der gesteuerte Ausgang S des Dimmers 1 ist über das Vorschaltgerät 2 mit einer der Elektroden 9 der Leuchtstofflampe 7 verbunden und außerdem mit dem S-Anschluß des Grundlastgerätes 3. Der Ausgang L1 des Dimmers 1, der im Dimmer 1 über einen Schalter mit der Phase L verbunden ist, ist zu einem ersten Anschluß der Primärwicklung des Heiztransformators 4 und zum L1-Anschluß des Grundlastgerätes 3 geführt. Der Nulleiter N ist zum N-Anschluß des Grundlastgerätes 3, zu einem zweiten Anschluß der Primärwicklung des Heiztransformators 4 und zu der nicht mit dem Vorschaltgerät 2 verbundenen Elektrode 9 der Leuchtstofflampe 7 geführt. Die Sekundärwicklungen des Heiztransformators 4 sind jeweils mit den Elektroden 9 verbunden.In the drawing, a circuit arrangement for brightness control of fluorescent lamps is shown. This circuit arrangement is based on a conventional arrangement of a fluorescent lamp 7 with a ballast 2, a heating transformer 4 for preheating the electrodes 9 of the fluorescent lamp 7, a dimmer 1 and a base load device 3. Here is the Netzspan voltage with the phase L and the neutral conductor N to the input of the dimmer 1. The controlled output S of the dimmer 1 is connected via the ballast 2 to one of the electrodes 9 of the fluorescent lamp 7 and also to the S connection of the base load device 3. The output L1 of the dimmer 1, which is in the dimmer 1 via a switch with the phase L is connected to a first connection of the primary winding of the heating transformer 4 and to the L1 connection of the base load device 3. The neutral conductor N leads to the N connection of the base load device 3, to a second connection of the primary winding of the heating transformer 4 and to the electrode 9 of the fluorescent lamp 7 which is not connected to the ballast 2. The secondary windings of the heating transformer 4 are each connected to the electrodes 9.

Das Grundlastgerät 3 enthält eine induktive Last, die an die Anschlüsse N und S angeschlossen ist, sowie einen Funkentstörkondensator zwischen dem L1- und dem N-Anschluß. Anstelle des Grundlastgerätes 3 kann auch eine Glühlampenlast (z.B. 25W). zwisehen die Ausgänge L1 und N des Dimmers 1 geschaltet werden, wodurch sich bei Verwendung von Leuchtstofflampen 7 mit 26mm Durchmesser bessere Steuereigenschaften als bei Verwendung eines Grundlastgerätes 3 ergeben.The basic load device 3 includes an inductive load, which is connected to the terminals N and S, and a radio interference suppression capacitor between the L1 and the N - terminal. Instead of the base load device 3, an incandescent lamp load (eg 25W) can also be used. The outputs L1 and N of the dimmer 1 are switched, which results in better control properties when using fluorescent lamps 7 with a diameter of 26 mm than when using a base load device 3.

Auch die bekannte Zündhilfe in Form eines Zündstreifens oder eines Schirmgitters 5 kann vorteilhaft für Leuchtstofflampen 7 mit 26mm Durchmesser zur Verbesserung der Steuereigenschaften angewendet werden. Solche Schirmgitter 5 werden über einen Schutzwiderstand 8 mit Erde PE oder mit dem Nulleiter N verbunden.The known ignition aid in the form of an ignition strip or a screen grid 5 can also be used advantageously for fluorescent lamps 7 with a diameter of 26 mm to improve the control properties. Such screen grids 5 are connected to earth PE or to the neutral conductor N via a protective resistor 8.

Da mit der bisher beschriebenen bekannten Schaltungsanordnung nicht die erforderliche Zündspannung erreicht wird, ist erfindungsgemäß zusätzlich ein Zündgerät 6 vorgesehen. Das Zündgerät 6 liefert zum Anstieg der Phasenanschnittspannung am Ausgang S des Dimmers 1 synchrone Zündimpulse, die den Elektroden 9 der Leuchtstofflampe 7 zugeführt werden.Since, with the known circuit arrangement described so far, the required ignition voltage is not achieved, an ignition device 6 is additionally according to the invention intended. The ignition device 6 supplies synchronous ignition pulses to increase the phase gating voltage at the output S of the dimmer 1, which are fed to the electrodes 9 of the fluorescent lamp 7.

Das Zündgerät 6 enthält eine Hintereinanderschaltungeiner Phasenanschnittauswertung 61, einer Einschaltverzögerung 62, einer Störimpulsaustastung 63, eines Impulsverstärkers 64, eines Zündimpulsgenerators 65 und eines Zündimpulstransformators 66. Außerdem ist ein Netzgerät 67 zur Speisung der vorgenannten Komponenten vorhanden.The ignition device 6 contains a series connection of a phase control evaluation 61, a switch-on delay 62, an interference pulse blanking 63, a pulse amplifier 64, an ignition pulse generator 65 and an ignition pulse transformer 66. A power supply unit 67 is also provided for supplying the aforementioned components.

Der Eingang der Phasenanschnittauswertung 61 ist mit dem gesteuerten Ausgang S des Dimmers 1 verbunden. In der Phasenanschnittauswertung 61 wird mit Zenerdioden ein Rechtecksignal (z.B. 12V) erzeugt, dessen ansteigende Flanke synchron zum Phasenanschnitt der positiven Halbwellen am Eingang verläuft. Ein Zeitglied gibt dieses Rechtecksignal erst etwa 4ms nach dem Nulldurchgang der Netzspannung frei. Das Rechtecksignal erscheint also am Ausgang der Phasenanschnittauswertung 61 synchron zum Anstieg der angeschnittenen Spannung mit der Ausnahme des Anschnittbereichs unter 4ms, indem ein Spannungsanstieg erst 4ms nach dem Nulldurchgang ein Rechtecksignal auslöst.The input of the phase gating evaluation 61 is connected to the controlled output S of the dimmer 1. In the phase control evaluation 61, a square wave signal (e.g. 12V) is generated with Zener diodes, the rising edge of which runs synchronously with the phase control of the positive half-waves at the input. A timing element only releases this square-wave signal about 4 ms after the mains voltage has passed zero. The square-wave signal therefore appears at the output of the phase gating evaluation 61 in synchronism with the rise in the cut voltage, with the exception of the gating area below 4 ms, in that a voltage rise triggers a square-wave signal only 4 ms after the zero crossing.

Die von der Phasenanschnittauswertung 61 erzeugten Rechtecksignale durchlaufen anschließend die Einschaltverzögerung 62. Darin werden die Rechtecksignale innerhalb der ersten 2s nach dem Einschalten des Dimmers 1 gesperrt. Diese Verzögerungszeit ergibt sich aus der zweckmäßig zur Schonung der Elektroden 9 einzuhaltenden Vorheizzeit.The square-wave signals generated by the phase gating evaluation 61 then pass through the switch-on delay 62. The square-wave signals are blocked therein within the first 2 seconds after the dimmer 1 has been switched on. This delay time results from the preheating time which is expedient to be observed in order to protect the electrodes 9.

In der sich anschließenden Störimpulsaustastung 63 werden Rechtecksignale unterhalb einer bestimmten Länge (z.B. 200 µs) als Störimpulse erkannt und unterdrückt.In the subsequent glitch blanking 63 who the square wave signals below a certain length (eg 200 µs) are recognized as interference pulses and suppressed.

Die Rechtecksignale am Ausgang der Störimpulsaustastung 63 werden anschließend im Impulsverstärker 64 in einer Transistorschaltung verstärkt und über einen fibertrager Thyristoren im Zündimpulsgenerator 65 zugeführt.The square-wave signals at the output of the interference pulse blanking 63 are then amplified in a transistor circuit in the pulse amplifier 64 and fed via a fiber-carrying thyristors in the ignition pulse generator 65.

Der Zündimpulsgenerator 65 wird mit der Netzspannung versorgt und enthält zwei Thyristoren und zwei Kondensatoren, die auf +300V bzw. -300V aufgeladen werden. Gesteuert durch die Rechtecksignale aus dem Impulsverstärker 64 entladen die Thyristoren die Kondensatoren über die Primärwicklung des Zündimpulstransformators 66. Auf der Sekundärseite des Zündimpulstransformators 66 entstehen Zündimpulse von etwa 1,5kV, die über einen Kondensator 68 auf die Elektroden 9 der Leuchtstofflampe 7 gegeben werden. Die Dauer der Zündimpulse ist so bemessen, daß ein flackerfreier Betrieb der Leuchtstofflampe 7 gegeben ist. The ignition pulse generator 65 is supplied with the mains voltage and contains two thyristors and two capacitors, which are charged to + 300V and -300V. Controlled by the square-wave signals from the pulse amplifier 64, the thyristors discharge the capacitors via the primary winding of the ignition pulse transformer 66. On the secondary side of the ignition pulse transformer 66, ignition pulses of approximately 1.5 kV are generated, which are applied to the electrodes 9 of the fluorescent lamp 7 via a capacitor 68. The duration of the ignition pulses is such that flicker-free operation of the fluorescent lamp 7 is ensured.

Claims (1)

1.1.
EP84103836A 1983-04-30 1984-04-06 Circuit arrangement for controlling the intensity of the light of fluorescent lamps Withdrawn EP0123963A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833315793 DE3315793A1 (en) 1983-04-30 1983-04-30 CIRCUIT ARRANGEMENT FOR THE BRIGHTNESS CONTROL OF FLUORESCENT LAMPS
DE3315793 1983-04-30

Publications (2)

Publication Number Publication Date
EP0123963A2 true EP0123963A2 (en) 1984-11-07
EP0123963A3 EP0123963A3 (en) 1985-05-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103836A Withdrawn EP0123963A3 (en) 1983-04-30 1984-04-06 Circuit arrangement for controlling the intensity of the light of fluorescent lamps

Country Status (4)

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EP (1) EP0123963A3 (en)
DE (1) DE3315793A1 (en)
FI (1) FI841690A (en)
NO (1) NO841699L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0353382A1 (en) * 1988-08-02 1990-02-07 Heraeus Kulzer GmbH Driving circuitry for a low-pressure discharge lamp
WO2003079739A1 (en) * 2002-03-20 2003-09-25 Gernot Hass Spotlight system having a regulating device
EP1370122A2 (en) * 2002-05-31 2003-12-10 Matsushita Electric Industrial Co., Ltd. Discharge lamp ballast with dimming

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277415B (en) * 1993-04-23 1997-12-03 Matsushita Electric Works Ltd Discharge lamp lighting device
DE102008015441A1 (en) 2008-03-22 2010-06-10 Abb Ag Electronic stabilization and ignition aid for fluorescent lamp, is connected with electrodes of fluorescent lamp by two connections

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875458A (en) * 1974-06-10 1975-04-01 Westinghouse Electric Corp Dimmer for discharge lamp utilizing a pulse enabling circuit
US4286196A (en) * 1980-02-14 1981-08-25 Auer William F Automatic dimmer cutout for arc lamp of fiber optic light source

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT267678B (en) * 1965-12-07 1969-01-10 Elin Union Ag Circuit for a fluorescent lamp fed from an alternating voltage source via controllable electrical valves

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875458A (en) * 1974-06-10 1975-04-01 Westinghouse Electric Corp Dimmer for discharge lamp utilizing a pulse enabling circuit
US4286196A (en) * 1980-02-14 1981-08-25 Auer William F Automatic dimmer cutout for arc lamp of fiber optic light source

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0353382A1 (en) * 1988-08-02 1990-02-07 Heraeus Kulzer GmbH Driving circuitry for a low-pressure discharge lamp
WO2003079739A1 (en) * 2002-03-20 2003-09-25 Gernot Hass Spotlight system having a regulating device
EP1370122A2 (en) * 2002-05-31 2003-12-10 Matsushita Electric Industrial Co., Ltd. Discharge lamp ballast with dimming
EP1370122A3 (en) * 2002-05-31 2004-03-10 Matsushita Electric Industrial Co., Ltd. Discharge lamp ballast with dimming
US6788006B2 (en) 2002-05-31 2004-09-07 Matsushita Electric Industrial Co., Ltd. Discharge lamp ballast with dimming

Also Published As

Publication number Publication date
FI841690A (en) 1984-10-31
EP0123963A3 (en) 1985-05-29
NO841699L (en) 1984-10-31
FI841690A0 (en) 1984-04-27
DE3315793C2 (en) 1992-01-30
DE3315793A1 (en) 1984-10-31

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