EP1884142A1 - Circuit destine a l'utilisation d'une lampe a decharge comportant un condensateur a resonance commutable - Google Patents

Circuit destine a l'utilisation d'une lampe a decharge comportant un condensateur a resonance commutable

Info

Publication number
EP1884142A1
EP1884142A1 EP06742341A EP06742341A EP1884142A1 EP 1884142 A1 EP1884142 A1 EP 1884142A1 EP 06742341 A EP06742341 A EP 06742341A EP 06742341 A EP06742341 A EP 06742341A EP 1884142 A1 EP1884142 A1 EP 1884142A1
Authority
EP
European Patent Office
Prior art keywords
lamp
circuit arrangement
transistor
voltage
capacitor
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Withdrawn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
EP06742341A
Other languages
German (de)
English (en)
Inventor
Klaus Fischer
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1884142A1 publication Critical patent/EP1884142A1/fr
Withdrawn legal-status Critical Current

Links

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 invention relates to a circuit arrangement for operating a discharge lamp according to the preamble of patent claim 1.
  • the resonant circuit is powered by an inverter that converts a rectified and smoothed supply voltage into a high frequency AC voltage.
  • the resonant capacitor is connected to the lamp such that, prior to the ignition of the gas discharge, the current flowing across the resonant capacitor flows across both coils, thereby allowing them to be preheated to an emissive temperature.
  • the frequency of the inverter is brought by suitable measures in the vicinity of the resonant frequency of the resonant circuit. As a result, high voltages are generated across the resonant capacitor and thus across the lamp and the gas discharge is ignited.
  • the resonance capacity can not be chosen arbitrarily large.
  • the inductance in the resonant circuit serves to limit the lamp current, and the lamp-parallel capacitance of the resonant capacitor impresses a reactive current in the inductor in addition to the active current flowing in the lamp.
  • overloading or damage to the lamp filaments may occur if the sum of the active current through the lamp and the reactive current flowing across the resonance capacitor is too great. In this regard, it would be advantageous if the capacitance of the resonant capacitor is not too high for the operation of the lamp.
  • at least one resonance capacitor is connected in series with a switching element parallel to the lamp according to the invention.
  • Advantage of the invention is therefore that both the requirement of a large resonance capacity in the preheating phase and a less large resonance capacity in operation can be satisfied.
  • a resonant capacitor is connected in parallel to the lamp, which is not in series with a switching element, and a resonant capacitor, which is in series with a switching element.
  • the switching element thus does not switch the entire resonance capacity off or on, but the resonance capacity is correspondingly reduced and enlarged.
  • This embodiment is particularly advantageous for dimmable lamps.
  • the luminous flux of the lamp can be adjusted by varying the frequency of the inverter.
  • the complex resistance of the resonance capacitor becomes progressively lower as the frequency increases.
  • the achievable open circuit voltage of the ballast and thus the maximum operable burning voltage is limited.
  • Dimming is desired, so that one can produce high lamp voltages at low lamp currents.
  • the switching element is a transistor, in particular a MOSFET. It is a common switching element.
  • the cathode of a zener diode is connected to a control terminal of the transistor, and its anode is connected to a shieldspotentiai for the control voltage of the transistor.
  • the discharge lamp has filaments which can be heated by current.
  • the resonant capacitor is then preferably connected so that the current flowing through the switchable resonant capacitor current flows at least partially through the lamp filaments.
  • the coils are bridged with diodes.
  • the anode of a first diode is connected to one terminal of the switchable resonance capacitor and the anode of a second diode is connected to a terminal of the switching element, in the case of a transistor having a reference potential for the control voltage.
  • the cathodes of both diodes are connected to the inverter side terminals of the coils.
  • the switching element In a switching element such as a transistor, the switching element must be protected from excessive voltages. If the blocking voltage is exceeded, a voltage breakdown can occur.
  • a further diode is preferably provided whose cathode is connected to a positive supply potential of the inverter and whose anode is connected to the switching element.
  • this diode limits the maximum voltage applied to the transistor to the value of the supply voltage.
  • FIG. 1 shows a circuit diagram of a circuit arrangement for operating a discharge lamp according to a first embodiment of the invention
  • Figure 2 is a circuit diagram of a circuit arrangement for operating a discharge lamp according to a second embodiment of the invention.
  • FIG. 3 shows a circuit diagram of a circuit arrangement for operating a discharge lamp according to a third embodiment of the invention.
  • FIG. 1 shows a circuit arrangement according to a first embodiment of the invention.
  • the mains voltage is rectified by a rectifier GL and smoothed with a capacitor C1.
  • An inverter which need not be further described here, converts the rectified and smoothed supply voltage into a high-frequency AC voltage.
  • a resonant circuit which consists of a coupling capacitor C2, a current limiting inductor L and two resonant capacitors C3 and CA, wherein the resonant capacitor C4 is connected in series with a switching element T1 parallel to the lamp EL.
  • the switching element can be switched via a control circuit CC.
  • the switching element T1 is shown here as a MOS transistor.
  • the transistor T1 is turned on during a preheat and ignition phase, whereby the capacitor is electrically effective parallel to the lamp.
  • the transistor After the ignition of the lamp, the transistor can be switched off to reduce the e- lectrically effective resonance capacity.
  • the switched-off resonance capacitor charges once to the peak value of the burning voltage, but is no longer discharged because of the transistor turned off and thus remains electrically passive.
  • the breakdown voltage of the transistor must be selected so that it is at least twice as high as the peak value of the burning voltage, so that it does not come to a voltage breakdown even with a half-oscillation in the resonant circuit in the opposite direction.
  • the capacitance of the switchable resonant capacitor C4 is not used to heat filaments of the lamp.
  • FIG. 2 shows an embodiment in which the switchable resonance capacitor is connected to the lamp on the heating circuit side.
  • Two diodes D1 and D2 are provided whose cathodes are connected to the inverter-side terminals of the coils.
  • the anode of the first diode D1 is connected to a terminal of the switchable resonance capacitor.
  • the anode of the second diode D2 is connected to the reference potential for the control voltage of the transistor T1.
  • the control voltage of the control circuit CC which here controls the transistor T1 is usually related to the negative potential of the overall circuit. A positive voltage drop across the lamp filament connected to this negative potential must be prevented. This would lead to a turn-off of the transistor T1, as not sufficient Control voltage is available at the output of CC. Therefore, the diode D2 bridges the coil so that the positive voltage drop across the coil can maximally take on the magnitude of the forward voltage of the diode.
  • the control voltage with which the control circuit CC turns on the transistor then only has to be at least as large as the sum of the forward voltage of the diode D2 and the threshold voltage of the transistor T1 used.
  • a Zener diode D3 is provided, whose cathode is connected to the control terminal of the transistor and whose anode is connected to the reference potential for the control voltage of the transistor.
  • the bridging of the lamp filament, which is directly connected to the switchable resonant capacitance, with a diode D1 serves symmetry.
  • the polarity of this diode is such that in each half-wave of the current through the inductance in each case one of the two coils of the current flowing through C3 and C4, while this current at the other helix on the respective parallel diode D1 and D2 bypasses becomes.
  • the capacitor C4 in the off state that is, when the transistor T1 is not turned on, charges to the negative peak value of the heater-side lamp burn voltage and remains in this state during the further operation until the transistor T1 is turned on again. Especially with bulbs with a large discharge lamp high burning voltages can occur at reduced lamp current. Due to the voltage across the capacitor C4 when the transistor is turned off, the required dielectric strength of the transistor T1 is very large.
  • the embodiment according to FIG. 3 differs from that according to FIG. 2 in that a diode D4 is provided which, on the cathode side, is connected to the positive supply potential of the inverter, i. H. is connected to the positive voltage side of the voltage source GL, with its anode connected to the switching element.
  • a diode D4 is provided which, on the cathode side, is connected to the positive supply potential of the inverter, i. H. is connected to the positive voltage side of the voltage source GL, with its anode connected to the switching element.
  • the diode D4 limits the maximum voltage value applied to T1 to the value applied to C1, that is to say the diode D4. H. to the instantaneous value of the supply voltage of the inverter.
  • a control circuit CC interacts with the inverter INV.
  • the switching on of the transistor T1 and thus the switching on of the capacitance C4 can take place in particular during the preheating of the turn, but also in the context of a complex control of the operation of the lamp, for example at full load, whereas the transistor T1 is then switched off during dimming of the lamp ,

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un circuit destiné à l'utilisation d'une lampe à décharge (EL) comportant un inverseur (INV) produisant une tension alternative haute fréquence à partir d'une tension d'entrée, et un circuit à résonance présentant au moins une bobine de réactance (L) et au moins un condensateur à résonance (C3, C4) destiné à l'alimentation de la lampe (EL). Selon l'invention, au moins un condensateur à résonance (C4) est connecté en parallèle à la lampe (EL), en série avec un élément de commutation (T1). La mise en marche/arrêt du condensateur à résonance permet de modifier la capacité de résonance lors de la commande de la lampe. La capacité de résonance peut par exemple être augmentée pour un préchauffage et réduite lors du fonctionnement de la lampe.
EP06742341A 2005-05-17 2006-05-15 Circuit destine a l'utilisation d'une lampe a decharge comportant un condensateur a resonance commutable Withdrawn EP1884142A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005022592A DE102005022592A1 (de) 2005-05-17 2005-05-17 Schaltungsanordnung zum Betrieb einer Entladungslampe mit schaltbarem Resonanzkondensator
PCT/DE2006/000833 WO2006122526A1 (fr) 2005-05-17 2006-05-15 Circuit destine a l'utilisation d'une lampe a decharge comportant un condensateur a resonance commutable

Publications (1)

Publication Number Publication Date
EP1884142A1 true EP1884142A1 (fr) 2008-02-06

Family

ID=36646131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06742341A Withdrawn EP1884142A1 (fr) 2005-05-17 2006-05-15 Circuit destine a l'utilisation d'une lampe a decharge comportant un condensateur a resonance commutable

Country Status (5)

Country Link
US (1) US20090102393A1 (fr)
EP (1) EP1884142A1 (fr)
CA (1) CA2608999A1 (fr)
DE (1) DE102005022592A1 (fr)
WO (1) WO2006122526A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100060184A1 (en) * 2006-05-31 2010-03-11 Koninklijke Philips Electronics N.V. Method and system for operating a gas discharge lamp
DE102007008395A1 (de) 2007-02-21 2008-08-28 Vossloh-Schwabe Deutschland Gmbh Vorschaltgerät mit Leistungsumschaltung
US7560868B2 (en) * 2007-05-11 2009-07-14 Osram Sylvania, Inc. Ballast with filament heating and ignition control
CN102656191B (zh) 2009-12-15 2014-03-19 埃克森美孚化学专利公司 低聚方法和反应器的温度控制
EP2547642B1 (fr) 2010-03-15 2016-01-13 ExxonMobil Chemical Patents Inc. Procédé de production d'alcools

Family Cites Families (16)

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Publication number Priority date Publication date Assignee Title
US3308342A (en) * 1963-09-24 1967-03-07 Bell Telephone Labor Inc Power supply for negative-resistance arc-discharge lamps
US4162430A (en) * 1978-05-30 1979-07-24 Westinghouse Electric Corp. Compact ballast for fluorescent lamp which provides excellent lamp power regulation
US4323824A (en) * 1979-12-21 1982-04-06 Gte Products Corporation Low voltage fluorescent operating circuit
DE3112577A1 (de) * 1981-03-30 1982-10-14 Patra Patent Treuhand Vorschaltanordnung zum betreiben von niederdruckentladungslampen
US4730147A (en) * 1986-08-19 1988-03-08 Siemens Aktiengesellschaft Method and arrangement for the operation of a gas discharge lamp
DE3910738A1 (de) * 1989-04-03 1990-10-04 Zumtobel Ag Vorschaltgeraet fuer eine direkt geheizte entladungslampe
DE4303595A1 (de) * 1993-02-08 1994-08-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb einer Leuchtstofflampe
DE4406083A1 (de) * 1994-02-24 1995-08-31 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe
US6057652A (en) * 1995-09-25 2000-05-02 Matsushita Electric Works, Ltd. Power supply for supplying AC output power
US5949196A (en) * 1997-03-13 1999-09-07 Lumatech Corporation Method and system for switchable light levels in operating gas discharge lamps with an inexpensive single ballast
US6104145A (en) * 1998-07-08 2000-08-15 Osram Sylvania Inc. Method of DC operation of a discharge lamp with ARC stabilization
US6144171A (en) * 1999-05-07 2000-11-07 Philips Electronics North America Corporation Ignitor for high intensity discharge lamps
DE10036950A1 (de) * 2000-07-28 2002-02-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Betriebsgerät für Entladungslampen mit Schalterentlastung beim Vorheizen der Elektrodenwendeln
DE20022847U1 (de) * 2000-11-16 2002-05-08 Herbert Waldmann GmbH & Co., 78056 Villingen-Schwenningen Steuerschaltung für eine Leuchtstofflampe
US6731075B2 (en) * 2001-11-02 2004-05-04 Ampr Llc Method and apparatus for lighting a discharge lamp
DE10252834A1 (de) * 2002-11-13 2004-05-27 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Vorrichtung zum Betreiben von Entladungslampen mittels eines Transformators mit vier Wicklungen und entsprechendes Verfahren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006122526A1 *

Also Published As

Publication number Publication date
CA2608999A1 (fr) 2006-11-23
WO2006122526A1 (fr) 2006-11-23
DE102005022592A1 (de) 2006-11-23
US20090102393A1 (en) 2009-04-23

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