EP0471332A1 - Assemblage de circuit pour le fonctionnement d'une lampe fluorescente - Google Patents

Assemblage de circuit pour le fonctionnement d'une lampe fluorescente Download PDF

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Publication number
EP0471332A1
EP0471332A1 EP91113563A EP91113563A EP0471332A1 EP 0471332 A1 EP0471332 A1 EP 0471332A1 EP 91113563 A EP91113563 A EP 91113563A EP 91113563 A EP91113563 A EP 91113563A EP 0471332 A1 EP0471332 A1 EP 0471332A1
Authority
EP
European Patent Office
Prior art keywords
switch
lamp
control circuit
voltage
circuit arrangement
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.)
Ceased
Application number
EP91113563A
Other languages
German (de)
English (en)
Inventor
Gottfried Stockinger
Jürgen Ludwig
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.)
Diehl Verwaltungs Stiftung
Original Assignee
Diehl GmbH and Co
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 Diehl GmbH and Co filed Critical Diehl GmbH and Co
Publication of EP0471332A1 publication Critical patent/EP0471332A1/fr
Ceased 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
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/18—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch
    • 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
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • 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
    • H05B41/3924—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by phase control, e.g. using a triac
    • 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
    • Y10S315/05—Starting and operating circuit for fluorescent lamp

Definitions

  • the invention relates to a circuit arrangement for the operation of a fluorescent lamp on an AC network, for example on an aircraft electrical system, with a switch located between the lamp electrodes and which can be switched by means of a control circuit, the lamp electrodes being heated when the switch is closed.
  • the control circuit is used to dim the brightness. It generates phase-shifted ignition voltage pulses by opening the switch in every mains half-wave. When the switch is closed, a heating current flows through the lamp electrodes. The ignition voltage pulses occur immediately in every mains half-wave when a mains switch is opened. Ignition voltage pulses also occur when the lamp electrodes are not sufficiently preheated.
  • CH-PS 595 036 a circuit arrangement of the type mentioned is also described. It is mentioned that a cold start is avoided in the dark control of the fluorescent lamps by preheating the lamp electrodes after the fluorescent lamps have been switched on. How this dark control is to be carried out is not specified.
  • the object of the invention is to propose a circuit arrangement of the type mentioned at the outset with which the life of the fluorescent lamp is automatically extended.
  • the above object is achieved in a circuit arrangement of the type mentioned at the outset in that a measuring element connected on the input side to the control circuit detects the voltage drop across at least one of the lamp electrodes and in that the control circuit only opens the switch for igniting the fluorescent lamp when the detected voltage essentially is constant, or reaches a threshold.
  • the invention makes use of the fact that the lamp electrodes have a positive temperature coefficient.
  • the ohmic resistance of the lamp electrodes increases from the cold state to the preheated state, for example by a factor of 4.
  • the switch connecting the lamp electrodes initially remains closed, so that a heating current flows through the lamp electrodes. With increasing heating of the lamp electrodes, the voltage detected by the measuring element increases. If this no longer changes or reaches a predetermined threshold value, the lamp electrodes are sufficiently preheated. First then the control circuit ignites the fluorescent lamp. Ignition attempts are therefore avoided during the preheating time. This increases the life of the fluorescent lamp considerably. When the fluorescent lamp is cold, the preheating time will generally take considerably longer than a half-wave of the AC mains voltage.
  • the respective preheating time is proportional to the cooling of the lamp electrodes, which occurs when the fluorescent lamps are switched off. If the fluorescent lamp was only switched off briefly before restarting, then the preheating time is shorter than if the fluorescent lamps were switched off for a longer period and the lamp electrodes were thus cooled further.
  • control circuit closes the switch for heating the electrodes when the voltage detected by the measuring element changes or falls below the threshold value. It is thereby achieved that the start of a preheating time is initiated automatically when the lamp electrodes are cold.
  • a timing element is provided which increases the preheating time to a maximum value limited. This ensures that overheating of the lamp electrodes is avoided in any case.
  • a second solution to the problem is characterized in that a transformer is provided for at least one of the lamp electrodes, the primary winding of which is connected in series with the switch and the lamp electrode is located on the secondary side, so that the lamp is closed Switch flowing preheating current is increased.
  • the lamp electrodes have manufacturer-specific variations and specimen variations of the ohmic resistances of the lamp electrodes. With the same preheating current and the same preheating time supplied by a ballast, the different fluorescent lamps would then be preheated differently. If the ballast supplies a sufficient preheating current for lamps with high resistance, then this does not lead to the desired preheating for lamps with low resistance lamp electrodes. This can lead to lamp start attempts with insufficiently heated electrodes. This would considerably reduce the lifespan of the fluorescent lamps in question. This is avoided by the transformer. Because the transformer amplifies the current flowing for the lamp electrode on the primary side when the switch is closed.
  • the transformer preferably has a non-linear core, so that a higher current gain occurs on the secondary side in the case of low-resistance lamp electrodes than in the case of high-resistance lamp electrodes.
  • a third solution to the stated problem is characterized in that a measuring element connected to the control circuit detects the operating voltage or the choke current in dimming mode and that If the operating voltage or the choke current falls below or exceeds a limit value, the control circuit shifts the ignition times.
  • a fourth solution to the above problem in a circuit arrangement of the type mentioned is characterized in that a voltage monitor monitors the operating voltage and that the voltage monitor switches off the ballast and the fluorescent lamp by means of a further switch in the event of voltage deviations which could damage a ballast or the fluorescent lamps.
  • This further switch is preferably a semiconductor switch. It is preferably switched on in the de-energized state and switched off at zero current.
  • circuit arrangements described solve the task individually.
  • An improved task solution is achieved in that the circuit arrangements are used in combination.
  • a fluorescent lamp (1) has a fluorescent tube (2) with two lamp electrodes (3, 4).
  • the lamp electrodes (3, 4) are connected to a passive or active ballast (5) and a power switch (6) AC voltage source (7), for example an aircraft electrical system, connected.
  • the passive ballast is formed by a choke (5).
  • the poles of the electrodes (3, 4) facing away from the AC voltage source (7) are connected to one another via a switch (8). This is controlled by a control circuit (9).
  • the control circuit (9) enables brightness control of the fluorescent lamp (1) (dimming operation) in a manner known per se.
  • the control circuit (9) has a phase shifter (10) and opens the switch (8) more or less out of phase with respect to the zero crossing in each half-wave of the AC mains voltage.
  • This switching frequency does not have to be twice the mains frequency. It can also have a network frequency or a multiple thereof or a fraction thereof. Opening the switch (8) generates an ignition pulse which ignites the fluorescent tube (2) (cf. ignition times t1 in FIG. 5). The combustion current or lamp current I2 then flows.
  • a measuring element (11) is connected to the control circuit (9) (see Fig. 1). This detects the voltage U4 dropping across the lamp electrode (4).
  • the measuring element (11) could also be connected in such a way that it detects the voltage U3 falling across the lamp electrode (3). It could also be switched so that it detects the voltage U2, which is the sum of the voltages U3 and U4 and the voltage drop across the switch (8).
  • the ohmic resistance of the lamp electrodes (3, 4) has a positive temperature coefficient. As long as the lamp electrodes (3, 4) are comparatively cold because, for example, the lighting was switched off by opening the mains switch (6), or the operating voltage U1 had briefly failed, or the fluorescent lamp (1) was replaced, the ohmic resistance of the lamp electrodes ( 3.4) much smaller than in operation.
  • the circuit works as follows: If the mains switch (6) is closed to switch on the lamp electrodes (3, 4), a heating current flows via the lamp electrodes (3, 4) and the switch (8).
  • the control circuit (9) detects the voltage drop across the measuring element (11) and thereby keeps the switch (8) closed. It is therefore not clocked according to the network frequency.
  • an evaluation of reaching a threshold value of voltage U4 can also be provided.
  • the threshold value is set on the control circuit (9). Only when the threshold value has been reached, the lamp electrodes (3, 4) so that they are sufficient Temperature are heated, the control circuit (9) cycles the switch (8) periodically.
  • a timer (12) can also be provided. This limits the preheating time to a maximum. This ensures that the lamp electrodes (3, 4) are not overheated.
  • Preheating the lamp electrodes (3, 4) before the mains frequency switching operation of the switch (8) has the advantage that the service life of the lamp electrodes (3, 4) is considerably increased, since cold start attempts are not made.
  • a transformer (13) is connected on the secondary side to the two poles (3 ', 3' ') of the lamp electrode (3).
  • a transformer (14) is connected on the secondary side to the two poles (4 ', 4' ') of the lamp electrode (4).
  • the transformers (13, 14) are designed as "autotransformers", with one winding part (13 'or 14') of the primary winding (13 '' or 14 '') forming the secondary winding.
  • the primary windings (13 '' or 14 '') are in series with the switch (8).
  • the low resistance Lamp electrodes (3,4) are preheated with a highly transformed current. This prevents cold start attempts from being carried out on the low-resistance, not yet sufficiently preheated lamp electrodes (3, 4). This extends their lifespan.
  • the transformers (13, 14) each have a magnetic core (13 '' 'or 14' '') (see FIG. 3).
  • the core is preferably non-linear in that it has a greatly reduced magnetic cross section in one leg (15). This is shown in Figure 3 as a partial gap (16).
  • the nonlinear core thus advantageously achieves a strong increase in the heating current in low-resistance lamp electrodes, whereas the heating current increases only slightly in high-resistance electrodes. At the same time it is also achieved that high magnetization losses, which could lead to a considerable increase in the temperature of the transformers, are avoided.
  • the circuit according to FIG. 2 also makes it possible to use fluorescent lamps (rapid start lamps) which require a higher heating current than other fluorescent lamps (starter lamps).
  • the circuit measures according to FIGS. 1 and 2 can be used together in a circuit arrangement.
  • the voltage U4 can then be measured between the poles (4 'and 4''). It can also be done on the primary winding (14 ''). The same applies to the voltage U3. In this case, too, a measurement of the voltage U2 can be provided.
  • control circuit (9) is designed so that it does not ignite the switch (8) in each half-wave of the mains AC voltage, but only in positive or negative half-waves, it may be sufficient to provide only one of the transformers (13, 14).
  • a measuring element (17) is provided which is connected to the control circuit (9). If the operating voltage U1 drops, then the choke current I1 and thus also the heating current I3, which flows in dimming mode in each mains half-wave and which is limited by the switching times t1, t2 controlled by the control circuit (9) (see FIG. 5). This could result in undesired cooling of the lamp electrodes (3, 4), which would shorten the life of the fluorescent lamp (1).
  • the measuring element (17) measures the choke current I1. This is compared in the control circuit (9) with a target value. Depending on this, the switching times t1 and t2 can be shifted. If the heating current I3 has decreased so that it only insufficiently heats the lamp electrodes (3, 4), ie cool the lamp electrodes, then the ignition times t1 are shifted towards the current maximum, ie to the right in FIG. This increases the peak value of the heating current I3. This is initially also connected with an extension of the heating current duration. This could result in a reduction in the brightness of the fluorescent lamp (1), since the duration of the combustion current I2 is shortened.
  • the additional measuring element (17) according to FIG. 4 can also be used in a circuit arrangement which realizes the features of the circuit arrangements according to FIGS. 1 and / or 2.
  • a voltage monitor (18) is provided for the operating voltage U1 of the AC voltage source (7). This controls a further switch (19) which is in series with the power switch (6).
  • the voltage monitor (18) is designed such that it opens the switch (19) in the event of overvoltages or undervoltage in the operating voltage U1 and closes it again when the overvoltage or undervoltage is no longer present. It is thereby achieved that such overvoltages or undervoltages are deactivated which could damage the ballast (5) or the fluorescent lamp (1).
  • the further switch (19) is a semiconductor switch that withstands at least the maximum permissible operating voltage U1.
  • the voltage monitor (16) is preferably designed such that it switches on the switch (19) in the de-energized state and switches it off in the de-energized state.
  • the circuit of the exemplary embodiment according to FIG. 6 can also be integrated into one or more of the circuits according to FIG. 1 and / or FIG. 2 and / or FIG. 4.
  • the circuit arrangements described can also be used when two or more fluorescent lamps are connected together. According to FIG. 7, two fluorescent lamps (1, 1 ') are connected in series on a single ballast (5). Only a single control circuit (9) for the two switches (8,8 ') is required here. It is sufficient to provide the measuring element (11) on one of the lamp electrodes (3, 4, 3 ', 4'). If necessary, only one measuring element (17) is required.
  • the ballasts (5,5 ') of the fluorescent lamps (1,1') are connected in parallel on the AC voltage source (7).
  • the control circuit (9) to which the measuring elements (11 and / or 17) are connected is required for the two switches (8, 8 ').

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP91113563A 1990-08-16 1991-08-13 Assemblage de circuit pour le fonctionnement d'une lampe fluorescente Ceased EP0471332A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4025938 1990-08-16
DE4025938A DE4025938A1 (de) 1990-08-16 1990-08-16 Schaltungsanordnung fuer den betrieb einer leuchtstofflampe

Publications (1)

Publication Number Publication Date
EP0471332A1 true EP0471332A1 (fr) 1992-02-19

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Application Number Title Priority Date Filing Date
EP91113563A Ceased EP0471332A1 (fr) 1990-08-16 1991-08-13 Assemblage de circuit pour le fonctionnement d'une lampe fluorescente

Country Status (3)

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US (1) US5175471A (fr)
EP (1) EP0471332A1 (fr)
DE (1) DE4025938A1 (fr)

Cited By (14)

* 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
EP0594880A1 (fr) * 1992-10-28 1994-05-04 Knobel Ag Lichttechnische Komponenten Procédé et circuit d'amorçage de lampes fluorescentes lorsque les électrodes de préchauffage ont atteint une température donnée
WO1995010168A1 (fr) * 1993-10-01 1995-04-13 C.M. Personnel Participation B.V. Ballast electronique pour lampe a gaz a decharge
WO1995035646A1 (fr) * 1994-06-22 1995-12-28 Physiomed-Medizintechnik Gmbh Commande de tubes fluorescents
WO1996028958A1 (fr) * 1995-03-16 1996-09-19 Beacon Light Products, Inc. Regulateur de variation d'intensite d'eclairage et son utilisation avec une lampe a fluorescence
WO1997011584A1 (fr) * 1995-09-20 1997-03-27 Robert Bosch Gmbh Circuit pour la mise en service et le fonctionnement d'une lampe a decharge a haute pression fonctionnant par un courant c.a commande
US5631523A (en) * 1995-09-19 1997-05-20 Beacon Light Products, Inc. Method of regulating lamp current through a fluorescent lamp by pulse energizing a driving supply
US5652481A (en) * 1994-06-10 1997-07-29 Beacon Light Products, Inc. Automatic state tranition controller for a fluorescent lamp
US5736817A (en) * 1995-09-19 1998-04-07 Beacon Light Products, Inc. Preheating and starting circuit and method for a fluorescent lamp
US5739640A (en) * 1995-12-08 1998-04-14 Beacon Light Products, Inc. Low line voltage detection control module and method for a fluorescent lamp
EP0845928A1 (fr) * 1996-11-29 1998-06-03 Toshiba Lighting & Technology Corporation Ballast pour lampes à décharge avec filaments de préchauffage
WO2000065886A1 (fr) * 1999-04-26 2000-11-02 Omnitronix Inc. Ballast electronique
WO2000072641A1 (fr) * 1999-05-19 2000-11-30 Koninklijke Philips Electronics N.V. Agencement de circuit
SG81228A1 (en) * 1998-10-01 2001-06-19 Jian Xu The electricity energy saver and dimmer device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4216716C1 (de) * 1992-05-20 1993-10-14 Siemens Ag Schaltungsanordnung zum Starten einer vorheizbaren Entladungslampe
DE4303595A1 (de) * 1993-02-08 1994-08-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb einer Leuchtstofflampe
FR2707051B1 (fr) * 1993-06-10 1996-03-08 Matsushita Electric Works Ltd
GB2316246A (en) * 1996-08-05 1998-02-18 Bf Goodrich Avionics Systemc I Intensity control for fluorescent lamps
US5854542A (en) * 1996-08-30 1998-12-29 Acres Gaming Incorporated Flashing and diming fluorescent lamps for a gaming device
CN101023712A (zh) * 2004-09-15 2007-08-22 皇家飞利浦电子股份有限公司 用于给热阴极荧光灯供电的方法和电路

Citations (4)

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Publication number Priority date Publication date Assignee Title
CH595036A5 (en) * 1975-05-30 1978-01-31 Novelectric Ag Fluorescent lamp control circuit
EP0111296A1 (fr) * 1982-12-10 1984-06-20 Siemens Aktiengesellschaft Dispositif pour contrôler l'intensité d'une lampe de décharge à basse pression
DE3327189A1 (de) * 1983-07-28 1985-02-07 Diehl GmbH & Co, 8500 Nürnberg Schaltungsanordnung fuer das zuenden und fuer die helligkeitssteuerung von leuchtstofflampen
WO1985002749A1 (fr) * 1983-12-05 1985-06-20 Wolf, Karl Montage de circuits pour le fonctionnement de lampes a decharge a basse tension a ultraviolet ou a substance fluorescente

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
NL7503826A (nl) * 1975-04-01 1976-10-05 Philips Nv Inrichting met een gas- en/of dampontladings- lamp.
IT1121148B (it) * 1979-06-26 1986-03-26 Siliani Pier Circuito d accensione per tubi fluorescenti e simili con riscaldamento preliminare dei filamenti
US4603281A (en) * 1983-12-12 1986-07-29 Nilssen Ole K Electronic fluorescent lamp starter
US4749909A (en) * 1984-12-21 1988-06-07 North American Philips Corporation Compact igniter for discharge lamps
JPS6212097A (ja) * 1985-07-10 1987-01-21 株式会社日立製作所 蛍光ランプ点灯装置
DE3901111A1 (de) * 1989-01-16 1990-07-19 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb von entladungslampen
KR910009146B1 (ko) * 1989-01-24 1991-10-31 정영춘 형광램프용 전자식 스타터

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH595036A5 (en) * 1975-05-30 1978-01-31 Novelectric Ag Fluorescent lamp control circuit
EP0111296A1 (fr) * 1982-12-10 1984-06-20 Siemens Aktiengesellschaft Dispositif pour contrôler l'intensité d'une lampe de décharge à basse pression
DE3327189A1 (de) * 1983-07-28 1985-02-07 Diehl GmbH & Co, 8500 Nürnberg Schaltungsanordnung fuer das zuenden und fuer die helligkeitssteuerung von leuchtstofflampen
WO1985002749A1 (fr) * 1983-12-05 1985-06-20 Wolf, Karl Montage de circuits pour le fonctionnement de lampes a decharge a basse tension a ultraviolet ou a substance fluorescente

Cited By (19)

* 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
EP0594880A1 (fr) * 1992-10-28 1994-05-04 Knobel Ag Lichttechnische Komponenten Procédé et circuit d'amorçage de lampes fluorescentes lorsque les électrodes de préchauffage ont atteint une température donnée
US5455486A (en) * 1992-10-28 1995-10-03 Knobel Ag Lichttechnische Komponenten Method and circuitry for igniting fluorescent lamps at a predetermined temperature of their cathodes
WO1995010168A1 (fr) * 1993-10-01 1995-04-13 C.M. Personnel Participation B.V. Ballast electronique pour lampe a gaz a decharge
NL9301694A (nl) * 1993-10-01 1995-05-01 Cm Personnel Participation Bv Electronische voorschakelinrichting voor gasontladingsbuizen.
US5652481A (en) * 1994-06-10 1997-07-29 Beacon Light Products, Inc. Automatic state tranition controller for a fluorescent lamp
WO1995035646A1 (fr) * 1994-06-22 1995-12-28 Physiomed-Medizintechnik Gmbh Commande de tubes fluorescents
US5811940A (en) * 1994-06-22 1998-09-22 Physiomed-Medizintechnik Gmbh Phase-shift lamp control
WO1996028958A1 (fr) * 1995-03-16 1996-09-19 Beacon Light Products, Inc. Regulateur de variation d'intensite d'eclairage et son utilisation avec une lampe a fluorescence
US5631523A (en) * 1995-09-19 1997-05-20 Beacon Light Products, Inc. Method of regulating lamp current through a fluorescent lamp by pulse energizing a driving supply
US5736817A (en) * 1995-09-19 1998-04-07 Beacon Light Products, Inc. Preheating and starting circuit and method for a fluorescent lamp
WO1997011584A1 (fr) * 1995-09-20 1997-03-27 Robert Bosch Gmbh Circuit pour la mise en service et le fonctionnement d'une lampe a decharge a haute pression fonctionnant par un courant c.a commande
US5739640A (en) * 1995-12-08 1998-04-14 Beacon Light Products, Inc. Low line voltage detection control module and method for a fluorescent lamp
EP0845928A1 (fr) * 1996-11-29 1998-06-03 Toshiba Lighting & Technology Corporation Ballast pour lampes à décharge avec filaments de préchauffage
US5939836A (en) * 1996-11-29 1999-08-17 Toshiba Lighting & Technology Corp. Discharge lamp lighting apparatus and lighting apparatus
SG81228A1 (en) * 1998-10-01 2001-06-19 Jian Xu The electricity energy saver and dimmer device
WO2000065886A1 (fr) * 1999-04-26 2000-11-02 Omnitronix Inc. Ballast electronique
WO2000072641A1 (fr) * 1999-05-19 2000-11-30 Koninklijke Philips Electronics N.V. Agencement de circuit
CN1316856C (zh) * 1999-05-19 2007-05-16 皇家菲利浦电子有限公司 电路装置

Also Published As

Publication number Publication date
DE4025938A1 (de) 1992-02-20
US5175471A (en) 1992-12-29

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