EP0589081B1 - Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe - Google Patents

Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe Download PDF

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Publication number
EP0589081B1
EP0589081B1 EP92116334A EP92116334A EP0589081B1 EP 0589081 B1 EP0589081 B1 EP 0589081B1 EP 92116334 A EP92116334 A EP 92116334A EP 92116334 A EP92116334 A EP 92116334A EP 0589081 B1 EP0589081 B1 EP 0589081B1
Authority
EP
European Patent Office
Prior art keywords
lamp
cathode
current
coil
electrical circuit
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.)
Expired - Lifetime
Application number
EP92116334A
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German (de)
English (en)
Other versions
EP0589081A1 (fr
Inventor
Felix Tobler
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.)
Knobel AG Lichttechnische Komponenten
Original Assignee
Knobel AG Lichttechnische Komponenten
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Publication date
Application filed by Knobel AG Lichttechnische Komponenten filed Critical Knobel AG Lichttechnische Komponenten
Priority to EP92116334A priority Critical patent/EP0589081B1/fr
Priority to DE59207908T priority patent/DE59207908D1/de
Priority to AT92116334T priority patent/ATE147926T1/de
Priority to US08/125,167 priority patent/US5504399A/en
Publication of EP0589081A1 publication Critical patent/EP0589081A1/fr
Application granted granted Critical
Publication of EP0589081B1 publication Critical patent/EP0589081B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/02—High frequency starting operation for fluorescent lamp

Definitions

  • the invention relates to a circuit arrangement with the features of the preamble of claim 1, as is known for example from EP 0 490 330 A1.
  • a circuit arrangement is known from DE 37 09 004 A1, in which the brightness of a fluorescent lamp is set by measuring and regulating the lamp current.
  • the lamp current is measured by means of a differential current transformer and its actual value is forwarded to a circuit part in order to regulate the lamp current to a preselected setpoint.
  • the windings of the differential current transformer must be manufactured very precisely, which adversely affects the costs of the circuit arrangement.
  • the object of the invention is therefore to create a more cost-effective circuit arrangement in which the lamp current can be measured over a wide dynamic range.
  • the known circuit arrangement shown in Figure 1 receives a fluorescent lamp LL, the lamp cathodes LK1, LK2 with a coupling capacitor C1, with a resonance capacitor C2, with two windings of the differential current transformer TR2.1, TR2.2, with a resonance choke L1 and with a winding of a feedback transformer Tr1.1 form a series resonance circuit which is connected between a pole of a supply voltage Ub and the output of an inverter operating at this supply voltage.
  • the inverter here consists of two power transistors, which switch the one pole of the series resonance circuit between the poles of the supply voltage Ub with a frequency close to the natural frequency of the series resonance circuit via two control circuits A1, A2 and two windings of the feedback transformer TR1.2, TR1.3.
  • a main circuit HS ensures that the fluorescent lamp is fed correctly after the circuit arrangement has been started up, the lamp cathodes being preheated first, then the fluorescent lamp being ignited and the lamp current being regulated to a predetermined setpoint I should .
  • the actual value of the lamp current I ist is via a third winding Transfer Tr2.3 of the residual current transformer to the main circuit HS.
  • the setpoint I want the lamp current is passed to a set point transmitter Tr3 to the main circuit HS.
  • the lamp cathodes must be continuously heated so that the fluorescent lamp does not age prematurely.
  • the lamp cathodes LK1, LK2 are heated by the cathode heating current I loom , which flows through the resonance capacitor C2 and, in the case of a strongly dimmed lamp, is considerably larger than the lamp current I L. If the total current of a residual current transformer is much larger than the differential current, very high demands are placed on the accuracy of the first two windings Tr2.1, Tr2.2 of the residual current transformer, so that the residual current transformer can work without errors in a larger dynamic range.
  • FIG 2 an embodiment of the circuit arrangement according to the invention is shown schematically.
  • the series resonance circuit is formed with a first winding of a feedback transformer Tr1.1, with a resonance choke L1, with a resonance capacitor C2 and with a first winding of an isolating transformer Tr4.1 and between the output of an inverter working on a supply voltage Ub and a pole of the supply voltage Ub switched.
  • the second winding of the isolating transformer Tr4.2 is connected in parallel with the second lamp cathode LK2.
  • the resulting voltage across the resistor R1 is thus the actual value of the lamp current I is proportional and can allow the main circuit HS which is also provided for regulating the lamp current are supplied. It is obvious to the person skilled in the art that such a solution for measuring the lamp current is considerably less expensive than measuring with a differential current transformer.
  • FIG. Compared to the circuit in FIG. 2, the lamp current is conducted in one half-wave via a series circuit of a first diode D3 with a resistor R1 and in the other half-wave via a second diode D4. This makes it possible to supply the main circuit HS with the already rectified value of the lamp current.
  • Another possibility is to use a simple rectifier / low-pass circuit GT to transmit the value of the lamp cathode voltage Vk to the main circuit.
  • the lamp cathode voltage Vk corresponds to the information about the state of the lamp cathodes in the preheating mode, in normal lamp mode or in the dimming mode of the fluorescent lamp.
  • the lamp cathode voltage Vk is one of the important parameters which, according to the regulations of the lamp manufacturers, must be observed within certain limits so that the service life of the fluorescent lamps is not impaired.
  • FIG. 4 Another embodiment of the circuit arrangement according to the invention is partially shown in FIG. 4, in which the cathode heating current I heating can be detected with the aid of a resistor R2 connected in series with the first winding of the isolating transformer Tr4.1 and a simple rectifier / low-pass circuit GT.
  • the detection of the cathode heating current can be used in preheating mode for optimal setting of the preheating current for the lamp cathodes, in ignition mode for measuring the level of the ignition voltage at a known oscillation frequency and with a known value of the resonance capacitor C2 and in lamp or dimming mode for monitoring the maximum cathode heating current.
  • FIG 5 another embodiment of the invention is partially shown, in which the possibility of regulating the heating power in the lamp cathodes LK1, LK2 by means of a third winding of the isolating transformer Tr4.3 connected in parallel with the first lamp cathode LK1 and one with a control circuit SS operated switch S1, which is connected in parallel to the first winding of the isolating transformer Tr4.1.
  • the switch S1 can be short-circuited periodically when a preselected threshold value is reached and thus prevent further heating of the lamp cathodes in the respective half-period. In this way, the power loss of the circuit arrangement can be minimized and the respective regulations of the lamp manufacturers can be easily complied with.
  • the control of the switch S1 can also be carried out periodically via a threshold value of the cathode heating current I heating , so that the lamp cathodes LK1, LK2 can be heated independently of the size of the total resonance current of the series resonance circuit I res and its frequency.
  • FIG. 6 schematically shows an embodiment of the circuit arrangement according to the invention with a plurality of fluorescent lamps LL1, LL2, LL3 in a shortened form.
  • a switching device U1 can be used to make the same circuit arrangement switchable to different lamp types with different lamp powers and lamp currents.
  • various parallel resistors RP1, RP2, RP3, RP4 are switched on and thus the respective fluorescent lamp is regulated to the lamp current associated with it.
  • Such a switching device can be provided in the circuit for specifying the setpoint of the lamp current instead of in the measurement circuit of the lamp current.

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Measurement Of Current Or Voltage (AREA)

Claims (11)

  1. Circuit électrique avec un redresseur inversé connecté à une source d'alimentation, avec un circuit de résonance (L1, C1) pour le fonctionnement d'au moins une lampe ayant deux cathodes de lampe (LK1, LK2), et avec un dispositif pour la mesure du courant de la lampe, caractérisé en ce que le circuit de résonance (L1, C1) comprenant la première cathode de lampe (LK1) est connecté entre la sortie du redresseur et un pâle de la source d'alimentation, que la seconde cathode de lampe (LK2) est accouplée par l'intermédiaire d'un transformateur de séparation (TR4.2) avec le circuit de résonance, et que le dispositif de mesure du courant de la lampe est agencé entre la seconde cathode de la lampe (LK2) et la source d'alimentation.
  2. Circuit électrique selon la revendication 1, caractérisé en ce que le circuit de résonance est un circuit de résonance en série comportant un condensateur d'accouplement (C1), un condensateur de résonance (C2), une impédance (L1) et une première bobine d'un transformateur de réaction (TR1.1), en ce qu'une première bobine du transformateur de séparation (TR4.1) est connectée en série dans le circuit de résonance en série, et que la seconde bobine du transformateur de séparation (TR4.2) est connectée en parallèle à la seconde cathode de lampe (LK2).
  3. Circuit électrique selon une des revendications 1 ou 2, caractérisé en ce que le dispositif pour la mesure du courant de la lampe comporte une résistance de mesure (R1).
  4. Circuit électrique selon une des revendications 1 ou 2, caractérisé en ce que le dispositif pour la mesure du courant de la lampe comprend un agencement en série d'une résistance de mesure (R1) et d'une première diode (D3) et qu'une seconde diode (D4) est connectée en parallèle avec cet agencement de façon à ce qu'une demi-onde du courant de la lampe passe à travers l'agencement en série (R1;D3) et la seconde demi-onde à travers la seconde diode (D4).
  5. Circuit électrique selon une des revendications 1 à 4, caractérisé par un circuit de mesure pour la tension de cathode de la lampe agencé en parallèle avec la première bobine du transformateur de séparation (TR4.1).
  6. Circuit électrique selon une des revendications 1 à 5, caractérisé par une résistance (R2) pour la mesure du courant de chauffage de la cathode connectée en série avec la première bobine du transformateur de séparation (TR4.1).
  7. Circuit électrique selon une des revendications 1 à 6, caractérisé par une troisième bobine du transformateur de séparation (TR4.3) connectée en parallèle avec la première cathode de lampe (LK1), par un interrupteur (S1) connecté en parallèle avec la première bobine du transformateur de séparation (TR4.1) et par un circuit de commande actionnant cet interrupteur ((S1).
  8. Circuit électrique selon la revendication 7, caractérisé en ce que l'interrupteur (S1) comporte un élément semi-conducteur et que le circuit de commande réagit à une valeur-seuil de la tension de cathode de la lampe ou à une valeur-seuil du courant de chauffage pour cathode.
  9. Circuit électrique selon une des revendications 1 à 8, pour le fonctionnement d'un agencement en série d'au moins deux lampes fluorescentes, caractérisé en ce que les cathodes voisines (LK3;LK4;LK5;LK6) des lampes fluorescentes sont connectées en série, que chaque tel agencement en série est connecté en parallèle avec une seconde bobine d'un transformateur de séparation additionnel correspondant (TR5.2, TR6.2), et que la première bobine correspondante du transformateur de séparation (TR5.1, TR6.1) est connectée en série avec le circuit de résonance.
  10. Circuit électrique selon une des revendications 1 à 9, caractérisé par un dispositif de sélection (U1) pour la sélection d'un courant de lampe prédéterminé.
  11. Circuit électrique selon la revendication 10, caractérisé en ce que le dispositif de sélection (U1) agit sur la valeur de consigne ou la valeur réelle du courant de lampe.
EP92116334A 1992-09-24 1992-09-24 Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe Expired - Lifetime EP0589081B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP92116334A EP0589081B1 (fr) 1992-09-24 1992-09-24 Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe
DE59207908T DE59207908D1 (de) 1992-09-24 1992-09-24 Schaltungsanordnung zum Betrieb einer Leuchtstofflampe und zur Messung des Lampenstroms
AT92116334T ATE147926T1 (de) 1992-09-24 1992-09-24 Schaltungsanordnung zum betrieb einer leuchtstofflampe und zur messung des lampenstroms
US08/125,167 US5504399A (en) 1992-09-24 1993-09-23 Electrical circuit for operating a fluorescent lamp and for measuring the lamp current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92116334A EP0589081B1 (fr) 1992-09-24 1992-09-24 Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe

Publications (2)

Publication Number Publication Date
EP0589081A1 EP0589081A1 (fr) 1994-03-30
EP0589081B1 true EP0589081B1 (fr) 1997-01-15

Family

ID=8210046

Family Applications (1)

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EP92116334A Expired - Lifetime EP0589081B1 (fr) 1992-09-24 1992-09-24 Circuit pour alimenter une lampe fluorescente avec mesure du courant passant par la lampe

Country Status (4)

Country Link
US (1) US5504399A (fr)
EP (1) EP0589081B1 (fr)
AT (1) ATE147926T1 (fr)
DE (1) DE59207908D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5656891A (en) * 1994-10-13 1997-08-12 Tridonic Bauelemente Gmbh Gas discharge lamp ballast with heating control circuit and method of operating same
EP1191824A2 (fr) * 2000-09-20 2002-03-27 Helvar Oy Ab Ballast électronique pour une lampe fluorescente

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425859A1 (de) * 1994-07-21 1996-01-25 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen
DE19501695B4 (de) * 1994-10-13 2008-10-02 Tridonicatco Gmbh & Co. Kg Vorschaltgerät für mindestens eine Gasentladungslampe mit vorheizbaren Lampenwendeln
FI101188B (fi) * 1997-01-03 1998-04-30 Helvar Oy Purkauslampun elektroninen liitäntälaite, jossa on lampputehon mittaus DC-signaalin avulla
US7126450B2 (en) * 1999-06-21 2006-10-24 Access Business Group International Llc Inductively powered apparatus
US6232726B1 (en) * 1999-12-28 2001-05-15 Philips Electronics North America Corporation Ballast scheme for operating multiple lamps
US6359387B1 (en) * 2000-08-31 2002-03-19 Philips Electronics North America Corporation Gas-discharge lamp type recognition based on built-in lamp electrical properties
US6501225B1 (en) * 2001-08-06 2002-12-31 Osram Sylvania Inc. Ballast with efficient filament preheating and lamp fault protection
DE102005001326A1 (de) * 2005-01-11 2006-07-20 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektronisches Vorschaltgerät (EVG)
DE102005047985A1 (de) * 2005-10-06 2007-04-12 Tridonicatco Gmbh & Co. Kg Dynamische Wendelheizung
TWI334123B (en) * 2007-02-26 2010-12-01 Au Optronics Corp Lightting apparatus with current feedback
ATE513450T1 (de) * 2007-04-23 2011-07-15 Osram Gmbh Schaltanordnung zum betreiben einer niederdruck- gasentladungslampe
DE102008004399A1 (de) * 2008-01-14 2009-07-16 HÜCO electronic GmbH Elektronisches Vorschaltgerät mit Strommesseinrichtung, Verfahren zu seiner Steuerung und Beleuchtungsgerät
WO2009089918A1 (fr) * 2008-01-18 2009-07-23 Osram Gesellschaft mit beschränkter Haftung Ballast électronique et procédé pour faire fonctionner au moins une lampe à décharge

Family Cites Families (8)

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NL7415839A (nl) * 1974-12-05 1976-06-09 Philips Nv Elektrische inrichting voor het ontsteken en voeden van een gas- en/of dampontladingslamp.
US4399391A (en) * 1981-06-10 1983-08-16 General Electric Company Circuit for starting and operating fluorescent lamps
US4553071A (en) * 1983-07-18 1985-11-12 Energies Technologies Corp. Electronic ballast for fluorescent lamp
DE3709004A1 (de) * 1987-03-19 1988-09-29 Knobel Elektro App Schaltungsanordnung zur speisung einer leuchtstofflampe
NL8800288A (nl) * 1988-02-08 1989-09-01 Nedap Nv Voorschakelapparaat voor een fluorescentielamp.
DE3829388A1 (de) * 1988-08-30 1990-03-01 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb einer last
DE4039161C2 (de) * 1990-12-07 2001-05-31 Zumtobel Ag Dornbirn System zur Steuerung der Helligkeit und des Betriebsverhaltens von Leuchtstofflampen
US5192896A (en) * 1992-04-10 1993-03-09 Kong Qin Variable chopped input dimmable electronic ballast

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5656891A (en) * 1994-10-13 1997-08-12 Tridonic Bauelemente Gmbh Gas discharge lamp ballast with heating control circuit and method of operating same
EP1191824A2 (fr) * 2000-09-20 2002-03-27 Helvar Oy Ab Ballast électronique pour une lampe fluorescente

Also Published As

Publication number Publication date
DE59207908D1 (de) 1997-02-27
ATE147926T1 (de) 1997-02-15
EP0589081A1 (fr) 1994-03-30
US5504399A (en) 1996-04-02

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