EP0602719B1 - Onduleur haute fréquence pour alimenter une lampe à décharge munie d'électrodes de préchauffage - Google Patents

Onduleur haute fréquence pour alimenter une lampe à décharge munie d'électrodes de préchauffage Download PDF

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Publication number
EP0602719B1
EP0602719B1 EP19930203448 EP93203448A EP0602719B1 EP 0602719 B1 EP0602719 B1 EP 0602719B1 EP 19930203448 EP19930203448 EP 19930203448 EP 93203448 A EP93203448 A EP 93203448A EP 0602719 B1 EP0602719 B1 EP 0602719B1
Authority
EP
European Patent Office
Prior art keywords
frequency
discharge lamp
load branch
branch
electrode
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
EP19930203448
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German (de)
English (en)
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EP0602719A1 (fr
Inventor
Frans Slegers
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP19930203448 priority Critical patent/EP0602719B1/fr
Publication of EP0602719A1 publication Critical patent/EP0602719A1/fr
Application granted granted Critical
Publication of EP0602719B1 publication Critical patent/EP0602719B1/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
    • 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
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation

Definitions

  • the invention relates to a circuit arrangement for high-frequency operation of a discharge lamp, comprising
  • Such a circuit arrangement is known from European Patent EP-A-0 098 285 and American Patent US-A-4 682 020.
  • the luminous flux of a discharge lamp operated by means of one of these known circuit arrangements may be adjusted in that the frequency of the control signal is adjusted.
  • a change in the frequency of the control signal leads to a change in the frequency of the high-frequency current through the load branch, so that the impedance of the load branch and the amplitude of the high-frequency current are also changed.
  • a change in the luminous flux of the discharge lamp may thus be achieved through a change in the frequency of the control signal.
  • the electrodes of the discharge lamp are heated during lamp operation both by the high-frequency current flowing through the lamp and by an electrode heating current of the same frequency which flows through the electrodes of the discharge lamp as a result of a potential difference between the ends of the secondary windings of the electrode heating transformer during lamp operation. It is ensured through dimensioning of the known circuit arrangement that the temperature of the lamp electrodes is maintained at a suitable value during a lamp operation in which the discharge lamp achieves the highest adjustable luminous flux as a result of the discharge current and the electrode heating current. Lamp electrode life is comparatively long at this suitable value of the electrode temperature.
  • the invention has for its object inter alia to provide a circuit arrangement by which it is possible to dim a discharge lamp operated by means of the circuit arrangement without the life of the discharge lamp being adversely affected by this.
  • a circuit arrangement of the kind mentioned in the opening paragraph is for this pulse characterized in that each branch shunting a secondary winding of the transformer comprises inductive means and capacitive means and has a resonance frequency which is different from the resonance frequency of the load branch.
  • the resonance frequencies of all branches shunting a secondary winding of the transformer are chosen to be either all lower than the resonance frequency of the load branch or all higher than the resonance frequency of the load branch. It is achieved by this that, at operating frequencies between the resonance frequency of the load branch and the resonance frequency of each branch shunting the ends of a secondary winding, a change in the operating frequency results either in an increase in the discharge current and an accompanying decrease in the electrode heating current, or in a decrease in the discharge current and an accompanying increase in the electrode heating current.
  • the luminous flux of the discharge lamp may be adjusted over a wide range, each luminous flux value of the discharge lamp having an accompanying electrode temperature of the discharge lamp of such a value that the electrode life is comparatively long, while in addition blackening of the lamp vessel ends hardly takes place.
  • An advantageous embodiment of a circuit arrangement according to the invention is characterized in that the load branch comprises an inductive element, in that the resonance frequency of the load branch has a lower value than the resonance frequencies of the branches shunting the secondary windings, and in that the frequency of the high-frequency current through the load branch is higher for each luminous flux value of the lamp which can be set than the resonance frequency of the load branch and lower than the resonance frequencies of the branches shunting the secondary windings of the electrode heating transformer. Since the frequency of the high-frequency current through the load branch is higher than the resonance frequency of the load branch, the load branch acts as an inductive impedance.
  • this is an important advantage because the life of the switching elements in the circuit arrangement is comparatively long when the load branch is an inductive impedance.
  • it is profitable to integrate the inductive element and the electrode heating transformer, so that one component performs different functions in the circuit arrangement. Owing to the comparatively small number of components, the circuit is of a comparatively simple construction, and thus more readily manufactured on a large scale.
  • reference numerals 1 and 2 denote input terminals for connection to a supply voltage source. It is desirable for the circuit arrangement shown in Fig. 1 that the supply voltage source should be a DC voltage source whose anode is connected to terminal 1 and whose cathode is connected to terminal 2.
  • Input terminals 1 and 2 are interconnected by a series circuit of two switching elements S1 and S2. Control electrodes of the switching elements are connected to respective outputs of control circuit I for generating a control signal which is to render the switching elements S1 and S2 alternately conducting and non-conducting with high frequency.
  • An input of control circuit I is connected to an output of dimmer circuit II which adjusts the frequency of the control signal.
  • the load branch in this embodiment is formed by capacitors C1, C2, C3 and C4, transformer L3, coils L1 and L2, terminals H1 and H2 for accommodating a discharge lamp, and the discharge lamp La.
  • the transformer L3 in this embodiment performs the function of electrode heating transformer as well as the function of inductive element.
  • a common junction point of the switching elements S1 and S2 is connected to a first side of capacitor C1.
  • a further side of capacitor C1 is connected to a first end of primary winding P of transformer L3.
  • a further end of primary winding P is connected to a first side of capacitor C4.
  • a further side of capacitor C4 is connected to input terminal 2.
  • the further end of primary winding P is also connected to a first end of electrode E11 of discharge lamp La.
  • Electrode E11 is shunted by a series circuit of coil L1, capacitor C1, and secondary winding Sec1 of transformer L3.
  • a first end of electrode E12 of the discharge lamp La is connected to input terminal 2.
  • Electrode E12 is shunted by a series circuit of coil L2, capacitor C2, and secondary winding Sec2.
  • the control circuit I When the input terminals 1 and 2 are connected to the anode and cathode, respectively, of a DC voltage source, the control circuit I renders the switching elements S1 and S2 conducting and non-conducting with a high frequency f. As a result, a high-frequency current with frequency f flows through the load branch. A high-frequency current with frequency f also flows through the two branches which shunt the secondary windings Sec1 and Sec2 of the transformer L3.
  • the lowest adjustable frequency of the control signal has been set by means of the dimmer circuit II, the discharge lamp La dissipates approximately its rated power and the luminous flux of the discharge lamp La has the maximum value which can be set.
  • the load branch is so dimensioned that the frequency f has a higher value than the resonance frequency of the load branch, so that the load branch is an inductive impedance at the frequency f.
  • the branches shunting the secondary windings Sec1 and Sec2 of transformer L3 are so dimensioned that the resonance frequencies of these branches are higher than the frequency f.
  • the impedances of these branches as a result are capacitive.
  • the electrode heating current is plotted on the vertical axis in mA.
  • the discharge current is plotted on the horizontal axis in mA.
  • the discharge lamp for which the relation between discharge current and electrode heating current as shown in Fig. 2 was measured was a low-pressure mercury discharge lamp of the PL-L type, make Philips, with a power rating of 55 W.
  • the curve K1 shows the measured relation between the discharge current and the electrode heating current. Points A and B on the curve K1 mark the limits of the adjustment range of the discharge current: 50 mA and 600 mA, respectively.
  • Curves K1 and K3 give the empirically determined maximum and minimum values, respectively, of the electrode heating current for each value of the discharge current, at which the electrode life of the discharge lamp is comparatively long.
  • Fig. 2 shows that the electrode heating current lies between the minimum and the maximum value throughout the entire adjustment range of the discharge current.

Claims (3)

  1. Agencement de circuit pour le fonctionnement à haute fréquences d'une lampe à décharge (LA), comportant
    des bornes d'entrée (1, 2) pour être reliées à une source de tension d'alimentation,
    une branche de charge pourvue de bornes (H1, H2) pour recevoir la lampe à décharge (LA) et d'un transformateur de chauffage d'électrode (L3) muni d'un enroulement primaire (P) et d'enroulements secondaires (Sec1, Sec2), chaque enroulement secondaire étant shunté par une branche comportant une électrode (El1, El2) de la lampe à décharge (LA),
    au moins un élément commutateur (S1, S2) pour engendrer à partir d'une tension d'alimentation délivrée par la source de tension d'alimentation un courant haute fréquences traversant la branche de charge,
    un circuit de commande (I) pour engendrer un signal de commande pour rendre l'élément commutateur (S1, S2) conducteur et non conducteur avec une haute fréquence,
    un circuit de gradation (H) couplé au circuit de commande pour régler la fréquence du signal de commande,
    caractérisé en ce que chaque branche shuntant un enroulement secondaire (Sec1, Sec2) du transformateur comporte des moyens inductifs (L1, L2) et des moyens capacitifs (C1, C2) et présente une fréquence de résonance qui est différente de la fréquence de résonance de la branche de charge.
  2. Agencement de circuit selon la revendication 1, caractérisé en ce que la branche de charge comporte un élément inductif, en ce que la fréquence de résonance de la branche de charge présente une valeur inférieure à celle des fréquences de résonance des branches shuntant les enroulements secondaires, et en ce que la fréquence du courant haute fréquence traversant la branche de charge est supérieure, pour chaque valeur du flux lumineux de la lampe qui peut être réglée, à la fréquence de résonance de la branche de charge et inférieure aux fréquences de résonance des branches shuntant les enroulements secondaires du transformateur de chauffage d'électrode.
  3. Agencement de circuit selon la revendication 2, caractérisé en ce que l'élément inductif fait corps avec le transformateur de chauffage d'électrode de manière à constituer un seul composant.
EP19930203448 1992-12-16 1993-12-09 Onduleur haute fréquence pour alimenter une lampe à décharge munie d'électrodes de préchauffage Expired - Lifetime EP0602719B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19930203448 EP0602719B1 (fr) 1992-12-16 1993-12-09 Onduleur haute fréquence pour alimenter une lampe à décharge munie d'électrodes de préchauffage

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92203942 1992-12-16
EP92203942 1992-12-16
EP19930203448 EP0602719B1 (fr) 1992-12-16 1993-12-09 Onduleur haute fréquence pour alimenter une lampe à décharge munie d'électrodes de préchauffage

Publications (2)

Publication Number Publication Date
EP0602719A1 EP0602719A1 (fr) 1994-06-22
EP0602719B1 true EP0602719B1 (fr) 1998-10-21

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EP19930203448 Expired - Lifetime EP0602719B1 (fr) 1992-12-16 1993-12-09 Onduleur haute fréquence pour alimenter une lampe à décharge munie d'électrodes de préchauffage

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Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19501695B4 (de) * 1994-10-13 2008-10-02 Tridonicatco Gmbh & Co. Kg Vorschaltgerät für mindestens eine Gasentladungslampe mit vorheizbaren Lampenwendeln
DE19520999A1 (de) * 1995-06-08 1996-12-12 Siemens Ag Schaltungsanordnung zur Wendelvorheizung von Leuchtstofflampen
BE1009717A3 (nl) * 1995-10-20 1997-07-01 Philips Electronics Nv Schakelinrichting.
DE19634850A1 (de) * 1996-08-28 1998-03-05 Tridonic Bauelemente Elektronisches Vorschaltgerät für Gasentladungslampen
EP0848581A1 (fr) * 1996-12-12 1998-06-17 Oy Helvar Circuit de chauffage des cathodes d'une lampe à décharge basse-pression
US5973455A (en) * 1998-05-15 1999-10-26 Energy Savings, Inc. Electronic ballast with filament cut-out
DE19923083A1 (de) * 1999-05-20 2001-01-04 Hueco Electronic Gmbh Vorschaltgerät für Niederdruckentladungslampen
AU2002210297A1 (en) * 2000-10-12 2002-04-22 Photoscience Japan Corporation Water treatment assembly
DE10053803A1 (de) * 2000-10-30 2002-05-08 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Beleuchtungssystem mit schonender Vorheizung von Gasentladungslampen
DE20114623U1 (de) * 2001-09-04 2004-02-12 Wilken, Wilhelm, Dr. Distaler Adapter für T5 Leuchtstofflampen mit Nachrüst-EVG
DE10304544B4 (de) * 2003-02-04 2006-10-12 Hep Tech Co.Ltd. Elektronisches Vorschaltgerät
JP4972151B2 (ja) * 2007-02-19 2012-07-11 パナソニック株式会社 放電灯点灯装置、照明装置、及び液晶表示装置
AT11177U1 (de) * 2008-12-19 2010-05-15 Tridonicatco Gmbh & Co Kg Heizungsschaltung für ein betriebsgerät für gasentladungslampen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140175A1 (de) * 1981-10-08 1983-04-28 Licentia Gmbh Transistorvorschalt-geraet
US4682080A (en) * 1984-08-17 1987-07-21 Hitachi, Ltd. Discharge lamp operating device
US4686427A (en) * 1985-08-13 1987-08-11 Magnetek, Inc. Fluorescent lamp dimming switch
DE4218959A1 (de) * 1991-07-11 1993-01-14 Bosch Gmbh Robert Schaltungsanordnung zum betrieb einer leuchtstofflampe

Also Published As

Publication number Publication date
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