WO2009089918A1 - Ballast électronique et procédé pour faire fonctionner au moins une lampe à décharge - Google Patents

Ballast électronique et procédé pour faire fonctionner au moins une lampe à décharge Download PDF

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Publication number
WO2009089918A1
WO2009089918A1 PCT/EP2008/050575 EP2008050575W WO2009089918A1 WO 2009089918 A1 WO2009089918 A1 WO 2009089918A1 EP 2008050575 W EP2008050575 W EP 2008050575W WO 2009089918 A1 WO2009089918 A1 WO 2009089918A1
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WO
WIPO (PCT)
Prior art keywords
coupled
inductance
output terminal
electronic ballast
secondary side
Prior art date
Application number
PCT/EP2008/050575
Other languages
German (de)
English (en)
Inventor
Bernd Rudolph
Harald Schmitt
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
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 Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Priority to PCT/EP2008/050575 priority Critical patent/WO2009089918A1/fr
Publication of WO2009089918A1 publication Critical patent/WO2009089918A1/fr

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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
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps

Definitions

  • the present invention relates to an electronic ballast for operating at least one discharge lamp having a first and a second input terminal for applying a DC supply voltage, a first output terminal having a primary side and a secondary side for coupling to a first coil of the at least one discharge lamp and a second output terminal with a primary side and a seconding ⁇ därseite for coupling to a second filament of the at least one discharge lamp, a bridge circuit comprising at least a first and a second electronic switch, wherein the first and the second electronic switch in series first between and coupled to the second input terminal, wherein between the first and the second switch, a bridge center is formed, a first inductance, which is coupled between the bridge center and the primary side of the second output terminal, and a Resonanzkonden ⁇ sator, which is coupled between the secondary side of the first gear ⁇ from connection and the secondary side of the second gear from ⁇ terminal. It also relates to a method for operating at least one discharge lamp on such an electronic ballast. State of the art
  • the so-called intermediate circuit voltage U Zw is provided to two switches Sl, S2 in a half-bridge arrangement using a capacitor Cl.
  • the positive terminal of the capacitor C1 is coupled via a decoupling capacitor C2 to the primary side P W i of a first filament Wl of a lamp La, which is usually designed as a fluorescent lamp.
  • the half-bridge center HM is coupled via a Last Vietnameseindukttechnik Ll with the primary side P w2 ei ⁇ ner second coil W2.
  • a resonance capacitor C3 is coupled between the secondary side S W i of the helix Wl and the secondary side S w2 of Wen ⁇ del W2 a resonance capacitor C3 is coupled.
  • the electrode filaments are brought by a pre-heating to the emission temperature prior to ignition of the fluorescent lamp La ⁇ .
  • preheating There are different types of preheating known.
  • the preheating of the resonant capacitor C3 of the load circuit which is connected via the helices Wl, W2 with the load ⁇ Vietnameseindukttechnik Ll used.
  • a we ⁇ sentliche limitation in this Vorannetechnik results from the fact that also the voltage across the lamp La is increased with the increase in the pre-heating and this gives rise above a certain limit for the early ignition of the lamp La.
  • the electronic ballast shown in FIG. 1 is unsuitable for the realization of short preheat times.
  • the transformer preheating, said resonant or off ⁇ takes to switch may be, the use of a Vorholicwicklung on the lamp inductor and a capacitor or the use of a capacitor with an inductor.
  • the following example illustrates the problem of realizing short preheating times with the electronic preheater shown in FIG. 1: From the standard EN 60081: 1998, it can be seen which current must be made available to the electrode coils in order to obtain them within a specific time preheat. At the same time, the standard specifies which voltage above the lamp must not be exceeded. For the example a lamp L36W is chosen. The intermediate circuit voltage is 430 V (boost). The operating frequency of the lamp is 45 kHz. For a preheating time of about 2 s, the standard gives a required preheating current of 550 mA. To get a lamp current of about 320 mA at the operating frequency of 45 kHz in continuous operation, the load circuit inductance, d. H. the lamp choke to choose to 2.2 mH. The voltage across the lamp must be less than 220 Vrms during preheating.
  • the load circuit during the preheating can provide a preheat ⁇ current of 550 mA at 220 V, the resonance capacitor C3 has to be chosen to 8.2 nF.
  • the self-adjusting preheat frequency is then 51 kHz.
  • the frequency is lowered in conventional An Kunststoffschal ⁇ lines until the load circuit resonant frequency is hit and ignites the lamp by the high voltage. Thereafter, the frequency is further lowered to the operating frequency at which the burning lamp is operated.
  • Another procedure in which at ⁇ play, after the ignition, the frequency for continuous operation is raised again would lead to high Treasureverlus ⁇ th due to the resonant capacitor and is therefore undesirable.
  • the load circuit resonance frequency must be higher than the operating frequency.
  • a lamp choke of 2.2 mH and a resonant capacitor of 8.2 nF a resonant frequency of 37.5 kHz results, which is below the steady-state frequency of 45 kHz.
  • This load circuit will therefore be unable to supply sufficient ignition voltage. With this preheating so a good preheating and ignition of the lamp would not be possible.
  • an apparatus and a method for preheating the filament electrodes of a fluorescent lamp in which, or in which a first inductance between an AC voltage source and egg ⁇ ne of the two filament electrodes is coupled and a second inductor to a point between the alternating ⁇ voltage source and the coupled therewith coil electrode is connected.
  • the second inductance is coupled to the first inductance such that a current flow leads by the second inductance to a reduction in the magnetization of the first inductance.
  • the patent application PCT / EP2007 / 053937 a circuit arrangement for operating a low-pressure gas discharge lamp with a first and a second coil / between which a gas discharge is formed, known, the circuit arrangement comprises means for generating a time-varying electrical potential at a node which is connected to the first coil via a first inductive element, and a semicircle which comprises a switch, wherein when the switch of the semicircle is closed, the first coil is electrically connected to the second coil.
  • the circuit arrangement is characterized in that a second inductive element is provided in the semicircle, which opens up the possibility of defining the size of the heating current. In this case, the voltage load of the Vorholicschalttransistors can be reduced.
  • the second inductance serves to reduce the voltage across the switch arranged in parallel with the lamp to switch between preheating and firing. The switch is closed during the preheat phase, whereas it is opened to ignite.
  • the object of the present invention is to further develop a generic electronic ballast and a generic method such that the field of application of the preheating technology correlated therewith is widened.
  • ADJUSTED SHEET (RULE 91) ISA / EP This object is achieved by an electronic ballast with the features of claim 1 and by a method having the features of claim 8.
  • the present invention is based on the finding that this problem can be solved if we succeed adorn the voltage across the lamp by simple means to redu ⁇ . Therefore, a second Indukti ⁇ tivity is provided according to the invention, which is coupled in series with the resonance capacitor between the secondary side of the first and the secondary ⁇ side of the second output terminal.
  • the voltage drop across the resonant capacitor can now be increased, for example, from 200 V to 300 V, when 100 V are compensated for by means of the second inductance.
  • the resonant capacitor can be selected to be smaller than in the prior art, which leads to an increase in the resonant frequency, so that the resonant frequency again comes to lie above the continuous operating frequency.
  • the first and the second inductance with ⁇ are coupled to one another.
  • the coupling of the second inductor may be reali ⁇ Siert with another inductor, a coupling with the second inductor of the first inductance allows for a particularly low-complexity implementation.
  • the first and the second inductance are coupled such that during a preheating operation of the at least one lamp, the voltage drop across the second inductance is opposite to the voltage at the resonance capacitor.
  • a third electronic switch is arranged in series with the resonance capacitor and the second inductance. This makes it possible to reduce the losses during continuous operation of the lamp by flowing through this circuit arranged parallel to the lamp only during the preheating of current.
  • FIG. 1 is a schematic representation of a known from the prior art electronic ballast.
  • Fig. 2 shows a schematic representation of an embodiment of an electronic ballast according to the invention.
  • the lamp inductor L1 of FIG. 1 is now divided into two separate inductors L1-I and L1-2.
  • the first partial inductance Ll-I replaces the previous lamp inductor Ll
  • the second partial inductance Ll-2 is connected in series to Reso ⁇ nanzkondensator C3, the series circuit consisting of resonant capacitor C3 and the second partial inductance Ll-2 parallel to the lamp La between the first Swi and the second secondary side S w2 is coupled.
  • the point of the highest voltage is no longer located at the lamp La, but at the connection point of the resonance capacitor C3 and the second inductance Ll-2.
  • the voltage across the second inductance Ll-2 is the voltage at the resonant capacitor C3 opposite and causes a reduction of the resulting voltage across the lamp La.
  • the resonance capacitor C3 can be downsized and the load circuit resonance frequency can be set again above the operating frequency. At the same time, the preheating frequency shifts to higher frequencies for the same preheating current.
  • the original 2.2 mH for the lamp inductor L1 are divided into 1.75 mH for the first inductance L1-I and 0.45 mH for the second inductance L1-2. While the lamp inductor L 1 has 180 turns with reference to FIG. 1, the inductance L 1 -I shown in FIG. 2 160 and the inductance L 1 -2 according to FIG. 2 have 35 windings. The lamp current, the operating frequency, the preheating current and the preheating voltage remain almost unchanged.
  • the Capa ⁇ capacity of the resonance capacitor C3 falls of 8.2 nF to 5, 6 nF.
  • an electronic switch is arranged se ⁇ riell to the resonant capacitor and the second inductance Ll-2. This allows in the closed state the preheat and is opened to ignite the lamp. So that a resonant increase of the voltage at the lamp is then made possible, a further capacitor is provided, which is coupled between the primary sides P W i and P w2 .

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un ballast électronique servant à faire fonctionner au moins une lampe à décharge comportant une première borne de sortie, dotée d'un côté primaire (PW1 ) et d'un côté secondaire (SW1 ) destinés à être couplés à un premier filament spiralé (W1), ainsi qu'une deuxième borne de sortie dotée d'un côté primaire (PW2 ) et d'un côté secondaire (SW2 ) destinés à être couplés à un deuxième filament spiralé (W2) de la lampe à décharge (La); un circuit en pont, qui comprend un premier (S1) et un deuxième commutateur électronique (S2), une première bobine d'induction (L1-1) et un condensateur de résonance (C3), couplé entre le côté secondaire (Sw1 ) de la première borne de sortie et le côté secondaire (SW2 ) de la deuxième borne de de sortie; ledit ballast électronique présente en outre une deuxième bobine d'induction (L1-2) qui est couplée en série avec le condensateur de résonance (C3) entre le côté secondaire (Sw1 ) de la première borne de sortie et le côté secondaire (S W2 ) de la deuxième borne de sortie. L'invention concerne en outre un procédé correspondant.
PCT/EP2008/050575 2008-01-18 2008-01-18 Ballast électronique et procédé pour faire fonctionner au moins une lampe à décharge WO2009089918A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/050575 WO2009089918A1 (fr) 2008-01-18 2008-01-18 Ballast électronique et procédé pour faire fonctionner au moins une lampe à décharge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/050575 WO2009089918A1 (fr) 2008-01-18 2008-01-18 Ballast électronique et procédé pour faire fonctionner au moins une lampe à décharge

Publications (1)

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WO2009089918A1 true WO2009089918A1 (fr) 2009-07-23

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993012631A1 (fr) * 1991-12-09 1993-06-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour actionner une ou plusieurs lampe(s) a decharge a basse pression
EP0589081A1 (fr) * 1992-09-24 1994-03-30 Knobel Ag Lichttechnische Komponenten Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe
EP1202612A2 (fr) * 2000-10-30 2002-05-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dispositif d'éclairage à préchauffage amélioré pour lampes à décharge
DE10145766A1 (de) * 2001-09-17 2003-04-03 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Vorrichtung und Verfahren zum Vorheizen der Wendelelektroden einer Leuchtstofflampe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993012631A1 (fr) * 1991-12-09 1993-06-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour actionner une ou plusieurs lampe(s) a decharge a basse pression
EP0589081A1 (fr) * 1992-09-24 1994-03-30 Knobel Ag Lichttechnische Komponenten Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe
EP1202612A2 (fr) * 2000-10-30 2002-05-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dispositif d'éclairage à préchauffage amélioré pour lampes à décharge
DE10145766A1 (de) * 2001-09-17 2003-04-03 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Vorrichtung und Verfahren zum Vorheizen der Wendelelektroden einer Leuchtstofflampe

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