EP0804052A3 - Control circuit for a discharge lamp - Google Patents

Control circuit for a discharge lamp Download PDF

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Publication number
EP0804052A3
EP0804052A3 EP97106831A EP97106831A EP0804052A3 EP 0804052 A3 EP0804052 A3 EP 0804052A3 EP 97106831 A EP97106831 A EP 97106831A EP 97106831 A EP97106831 A EP 97106831A EP 0804052 A3 EP0804052 A3 EP 0804052A3
Authority
EP
European Patent Office
Prior art keywords
lamp
luminance
temperature
cold cathode
pulse packet
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Withdrawn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
EP97106831A
Other languages
German (de)
French (fr)
Other versions
EP0804052A2 (en
Inventor
Martin Dipl.-Ing. Kurz
Helmut Dipl.-Ing. Habel
Thomas Dipl.-Ing. Eberharter
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 EP0804052A2 publication Critical patent/EP0804052A2/en
Publication of EP0804052A3 publication Critical patent/EP0804052A3/en
Withdrawn legal-status Critical Current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
    • H05B41/36—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
    • H05B41/3922—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations and measurement of the incident light
    • 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
    • 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
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

Die Erfindung betrifft eine Ansteuerung von Kaltkathodenlampen, die die Leuchtdichte der Lampe unabhängig von Umgebungs- und Einbaubedingungen einem vorgegebenen Wert möglichst angleicht und/oder einen optimalen Dimmbereich bei gleichzeitiger Lampenschonung ermöglicht, indem ein von der Lampentemperatur abhängiger Korrekturfaktor ermittelt und/oder die Leuchtdichte der Lampe direkt erfaßt und in Abhängigkeit dieser Werte die Amplitude und/oder das Tastverhältnis des Lampenstroms eingestellt wird, wobei gemäß einer lampenspezifischen Zeitkonstante die Lampentemperatur nicht nur gemessen sondern auch berechnet werden kann, und/oder eine alternative Auswahl von Pulsbreiten- und Pulspaketmodulation in Abhängigkeit des Lampenstroms und/oder der Leuchtdichte erfolgt sowie der Ausgang zusätzlich als geschalteter Gleichrichter ausgeführt werden kann.The invention relates to a control of cold cathode lamps, the Luminance of the lamp regardless of the ambient and installation conditions aligns a predetermined value as much as possible and / or an optimal one Dimming range while protecting the lamp is made possible by a correction factor dependent on the lamp temperature is determined and / or the luminance of the lamp is detected directly and as a function of it of these values the amplitude and / or the duty cycle of the lamp current is set, the according to a lamp-specific time constant Lamp temperature can not only be measured but also calculated can, and / or an alternative selection of pulse width and pulse packet modulation depending on the lamp current and / or the luminance and the output is also designed as a switched rectifier can be.

Die vorliegende Ansteuerung ermöglicht außerdem, Fehler des Systems zu erkennen und geeignete Gegenmaßnahmen einzuleiten, die Pulspaketwiederholrate mit Bildwiederholfrequenzen von LC-Schirmen zu korrelieren sowie die Betriebstemperatur der Kaltkathodenlampe durch eine elektrisch verstellbare externe Kühlung zu optimieren und damit den Wirkungsgrad des Gesamtsystems zu verbessern.

Figure 00000001
The present control also enables system errors to be identified and appropriate countermeasures to be initiated, the pulse packet repetition rate to be correlated with the refresh rates of LC screens, and the operating temperature of the cold cathode lamp to be optimized by means of an electrically adjustable external cooling system, thus improving the efficiency of the overall system.
Figure 00000001
EP97106831A 1996-04-24 1997-04-24 Control circuit for a discharge lamp Withdrawn EP0804052A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT743/96 1996-04-24
AT74396A AT407461B (en) 1996-04-24 1996-04-24 CONTROL FOR DISCHARGE LAMP

Publications (2)

Publication Number Publication Date
EP0804052A2 EP0804052A2 (en) 1997-10-29
EP0804052A3 true EP0804052A3 (en) 1999-04-07

Family

ID=3498638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97106831A Withdrawn EP0804052A3 (en) 1996-04-24 1997-04-24 Control circuit for a discharge lamp

Country Status (2)

Country Link
EP (1) EP0804052A3 (en)
AT (1) AT407461B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013041A1 (en) * 2000-03-17 2001-09-27 Trilux Lenze Gmbh & Co Kg Operating light with fluorescent lamp involves setting manufacturer's rated loading for detected lamp type in normal operation, reducing/ending if critical temperature reached/exceeded
DE202005021525U1 (en) 2004-03-30 2008-07-17 Ruppel, Stefan Lamp with a cold cathode tube
DE102005014857B4 (en) 2004-03-30 2010-12-23 Stefan Ruppel Luminaire, in particular for installation in or for attachment to a piece of furniture or a showcase, with a cold cathode tube
DE202004005184U1 (en) * 2004-03-30 2005-08-18 Ruppel, Stefan Lamp for lighting e.g. showcase, has controller for controlling power switching stage at constant operating voltage of cold cathode tubes when actual input voltage measured by voltage divider varies

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887122A (en) * 1987-11-04 1989-12-12 Minolta Camera Kabushiki Kaisha Copying machine
EP0406116A1 (en) * 1989-06-30 1991-01-02 Thomson-Csf Process and device for dimming a fluorescent lamp of an LCD backlight
EP0477922A1 (en) * 1990-09-25 1992-04-01 Toshiba Lighting & Technology Corporation Apparatus for operating discharge lamp
EP0572207A2 (en) * 1992-05-26 1993-12-01 Compaq Computer Corporation Constant brightness liquid crystal display backlight control system
WO1995012964A1 (en) * 1993-11-03 1995-05-11 Science Applications International Corporation High efficiency uv backlighting system for rear illumination of electronic display devices
US5428265A (en) * 1994-02-28 1995-06-27 Honeywell, Inc. Processor controlled fluorescent lamp dimmer for aircraft liquid crystal display instruments

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087722A (en) * 1975-05-01 1978-05-02 American Ionetics, Inc. Apparatus and method for supplying power to gas discharge lamp systems
DE2927837C2 (en) * 1979-07-10 1982-09-16 Peter 7750 Konstanz Kreutzer Transistor inverter circuit
JPS57129177A (en) * 1981-02-04 1982-08-11 Toshiba Electric Equip Corp Transistor inverter
US4356432A (en) * 1981-02-25 1982-10-26 Exxon Research And Engineering Co. Solid state power switch for gas discharge lamps
US4463284A (en) * 1981-07-28 1984-07-31 Konishiroku Photo Industry Co., Ltd. Method and apparatus for controlling luminous intensity of fluorescent lamp of reproducing apparatus
FR2614748A1 (en) * 1987-04-29 1988-11-04 Omega Electronics Sa DEVICE FOR SUPPLYING A DISCHARGE LAMP
US4920474A (en) * 1989-03-23 1990-04-24 North American Philips Corporation High frequency high voltage power supply with controlled output power
US5105125A (en) * 1990-08-06 1992-04-14 Yang Tai Her Device for alternating bulb polarities of a DC lighting system
JP2587718B2 (en) * 1990-10-01 1997-03-05 株式会社小糸製作所 Lighting circuit for vehicle discharge lamps
JP3030579B2 (en) * 1991-07-30 2000-04-10 株式会社キジマ Push-pull inverter
US5315214A (en) * 1992-06-10 1994-05-24 Metcal, Inc. Dimmable high power factor high-efficiency electronic ballast controller integrated circuit with automatic ambient over-temperature shutdown
DE4301276A1 (en) * 1993-01-19 1994-07-21 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Method and power supply unit for the stabilized operation of a sodium high-pressure discharge lamp
JP3606909B2 (en) * 1994-07-12 2005-01-05 三菱電機株式会社 AC discharge lamp lighting device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887122A (en) * 1987-11-04 1989-12-12 Minolta Camera Kabushiki Kaisha Copying machine
EP0406116A1 (en) * 1989-06-30 1991-01-02 Thomson-Csf Process and device for dimming a fluorescent lamp of an LCD backlight
EP0477922A1 (en) * 1990-09-25 1992-04-01 Toshiba Lighting & Technology Corporation Apparatus for operating discharge lamp
EP0572207A2 (en) * 1992-05-26 1993-12-01 Compaq Computer Corporation Constant brightness liquid crystal display backlight control system
WO1995012964A1 (en) * 1993-11-03 1995-05-11 Science Applications International Corporation High efficiency uv backlighting system for rear illumination of electronic display devices
US5428265A (en) * 1994-02-28 1995-06-27 Honeywell, Inc. Processor controlled fluorescent lamp dimmer for aircraft liquid crystal display instruments

Also Published As

Publication number Publication date
ATA74396A (en) 2000-07-15
AT407461B (en) 2001-03-26
EP0804052A2 (en) 1997-10-29

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