EP0866646A2 - Procédé et circuit pour alimenter au moins une lampe à décharge - Google Patents

Procédé et circuit pour alimenter au moins une lampe à décharge Download PDF

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Publication number
EP0866646A2
EP0866646A2 EP98103764A EP98103764A EP0866646A2 EP 0866646 A2 EP0866646 A2 EP 0866646A2 EP 98103764 A EP98103764 A EP 98103764A EP 98103764 A EP98103764 A EP 98103764A EP 0866646 A2 EP0866646 A2 EP 0866646A2
Authority
EP
European Patent Office
Prior art keywords
voltage
lamp
discharge lamp
circuit arrangement
electrical power
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Withdrawn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
EP98103764A
Other languages
German (de)
English (en)
Other versions
EP0866646A3 (fr
Inventor
Bernhard Ertl
Günther Hirschmann
Thomas Dr. Reiners
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 EP0866646A2 publication Critical patent/EP0866646A2/fr
Publication of EP0866646A3 publication Critical patent/EP0866646A3/fr
Withdrawn legal-status Critical Current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
    • H05B41/36—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
    • 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
    • H05B41/40—Controlling the intensity of light discontinuously
    • H05B41/42—Controlling the intensity of light discontinuously in two steps only

Definitions

  • the invention relates to a method and a circuit arrangement for Operation of at least one discharge lamp according to the generic terms of the Claims 1 and 14.
  • the field of application of the invention is in the field of motor vehicle lighting.
  • the aforementioned discharge lamps offer the advantage of a significant compared to incandescent lamps shorter response time, so that for example when using a neon gas discharge lamp the brake light to generate the brake light Actuation of the brake pedal in the motor vehicle lights up much earlier than would be the case when using an incandescent lamp as a brake light.
  • the difference in response times is approximately 0.2 s in favor the discharge lamps, which means a braking distance of about 6m at a speed of 100 km / h corresponds.
  • the discharge lamps stand out compared to incandescent lamps also by a high luminous efficacy and a long lifespan.
  • the discharge vessel the discharge lamps the desired lighting design and be adapted to the shape of the rear part of the motor vehicle body.
  • ballasts are required to operate the discharge lamps, the necessary for the ignition and operation of the discharge lamps Generate voltages from the vehicle electrical system voltage.
  • a method corresponding to the preamble of claim 1 Operation of a discharge lamp is, for example, in the European patent application EP 0 700 074.
  • This document describes an operating procedure for a neon gas discharge lamp, the one with a fluorescent layer provided discharge vessel and the two different Functions fulfilled.
  • the neon gas discharge lamp is used both for generation a red brake light as well as to generate an orange one Blinking light.
  • A is used to operate the neon gas discharge lamp Pulse generator used, the voltage pulses for the electrodes of the Discharge lamp generated. To generate the red brake light the pulse length and the pulse interval of the voltage pulses are set so that the neon involved in the gas discharge essentially only for delivery is excited by red light.
  • the pulse length and the pulse spacing of the voltage pulses be chosen that the neon involved in the gas discharge additionally to red light increasingly stimulated to emit UV radiation which in turn converts from the fluorescent layer to green light is so that the neon gas discharge lamp as a whole in this mode an orange light emits.
  • the light or radiation emission the neon gas is here by varying the pulse length and the pulse spacing changed so that the color locus of the emitted light in certain Limits is adjustable.
  • a method and a circuit arrangement specify to operate at least one discharge lamp, so that the same discharge lamp in a motor vehicle for two different ones Functions, namely on the one hand to generate a tail light and on the other hand can also be used to generate a signal light.
  • the operating method according to the invention for the at least one discharge lamp is characterized in that the at least one discharge lamp to generate the tail light with a first, lower electrical Power and to generate the signal light with a second, higher electrical power is operated.
  • This is also the brightness the at least one discharge lamp as signal light during operation correspondingly larger than during taillight operation.
  • the second, higher electrical power for the signal light operation advantageously at least twice the size of the first electrical output for the tail light mode the at least one discharge lamp.
  • the signal light is advantageously around the brake light of the motor vehicle, which is the same Light color as the tail light has.
  • the operating method according to the invention can be advantageously Fluorescent lamps or on discharge lamps with neon ionisable Apply filling or particularly advantageously to neon gas discharge lamps. All three of the aforementioned lamp types offer the advantages of a long lamp Lifespan, a high luminous efficacy and a short response time.
  • the use of fluorescent lamps is advantageous for Generation of any light colors for the signal light, which can be easily created by the Choice of the fluorescent coating of the discharge vessel can be set can.
  • a discharge lamp with a neon ionisable Filling advantageous for generating red light because the neon is in the gas discharge is stimulated to emit red light.
  • a neon gas discharge lamp for the invention Operating procedures, especially when it is the signal light is a brake light for which as well as for the Finally a light of red color must be generated because of the ionizable Filling of neon gas discharge lamps consists exclusively of neon and therefore no environmentally harmful substances such as mercury contains and also no phosphors required to generate the red light are.
  • the at least one discharge lamp is advantageously fed with a medium-frequency AC voltage, the frequency of which is preferably at least 20 kHz, an operating parameter of the at least one discharge lamp - preferably the lamp current flowing over the discharge path or the voltage drop across the lamp - during its operation by means of the method the pulse width modulation is regulated by carrying out a target / actual value comparison for a voltage signal proportional to this operating parameter.
  • This monitoring and control of the operating parameter of the at least one discharge lamp enables the electrical power of the at least one discharge lamp for both operating modes to be approximately constant in each case by using the pulse width modulation method, namely during operation as the tail light at first , lower value and during operation as a signal light to the second, higher value, largely independent of changes or fluctuations in the vehicle electrical system voltage.
  • the duty cycles of the signals generated by the pulse width modulation differ considerably in the two operating modes of the at least one discharge lamp.
  • the quotient ⁇ 2 / ⁇ 1 from the pulse duty factor ⁇ 1 of the pulse width modulation signal during lamp operation with the first, lower electrical power and the pulse duty factor ⁇ 2 of the pulse width modulation signal during lamp operation with the second, higher electrical power is advantageously between 1, 2 and 3.
  • the circuit arrangement according to the invention for performing the inventive Operating method advantageously has one, preferably trained as a push-pull converter, the medium frequency Supply voltage for the at least one discharge lamp generated from the vehicle electrical system voltage, and a control device for the voltage converter which controls the pulse width modulation of the voltage converter performs.
  • the target-actual-value comparison for the operating parameters to be monitored and regulated the at least one discharge lamp can advantageously be in a relatively simple way with the help of an operational amplifier and a realize switchable voltage divider between two settings. The change between the two operating modes of the at least one discharge lamp is then simply done by switching the voltage divider between its two settings. For switching the voltage divider an electronic switch is advantageously used.
  • the control device of the voltage converter is advantageous formed as an integrated circuit that the pulse width modulation control the voltage converter causes and in the advantageously the aforementioned operational amplifier is also integrated.
  • FIG. 1 illustrates the principle of the circuit arrangement according to the invention for operating a neon gas discharge lamp arranged at the rear of a motor vehicle LP.
  • This circuit arrangement has a push-pull converter, which in a known manner from two switching transistors T1, T2 and a transformer with two primary W1, W2 and a secondary winding W3 is constructed, and a load circuit in which the neon gas discharge lamp LP, the secondary winding W3 of the transformer and a current sensor resistor R23 are connected, as well as a control device IC for the switching transistors T1, T2 of the push-pull converter.
  • the control device is as an integrated circuit IC, in particular as a pulse width modulation module IC executed, which is also an operational amplifier OP contains.
  • the circuit arrangement according to the invention also has a resistor R24, a voltage divider R21, R20, a transistor switch Q, a feedback branch Z, a rectifier diode D3, one Buffer capacitor C and two Schottky diodes D1, D2.
  • the two Schottky diodes protect the circuit arrangement if connected the positive and negative poles of the vehicle electrical system are interchanged.
  • the push-pull converter is connected to the connector during lamp operation A3 with the negative pole of the motor vehicle voltage source and over the Connections A1 and / or A2 arranged in parallel, depending on the position of the assigned switches S1, S2, with the positive pole of the motor vehicle voltage source connected. It converts that from the motor vehicle voltage source supplied low-voltage DC voltage in a medium frequency AC voltage with a frequency of approx. 35 kHz. With help of the transformer W1, W2, W3, this AC voltage is used for the Ignition and voltage values required to operate the lamp LP transformed up.
  • the ignition voltage of the neon gas discharge lamp is about 6 kV.
  • the effective values of the operating voltage of the lamp and of the lamp current flowing over the discharge path is approximately 850 V and 17 mA.
  • switch S1 To the neon gas discharge lamp LP in its function as tail light operate, switch S1 must be closed while switch S2 remains open. Then the push-pull converter and its control device via the connections A1 and A3 to the low-voltage voltage source connected to the motor vehicle, so that the integrated Circuit IC alternately driven switching transistors T1, T2 of the push-pull converter with the help of the transformer W1, W2, W3 from the car battery supplied low-voltage DC voltage into a medium-frequency AC voltage with a frequency of approx. 35 kHz, which is used for ignition and Operation of the lamp is sufficient, highly transformed.
  • the control device IC generates pulse width modulation signals to control the gate electrodes of the two switching transistors T1, T2.
  • the non-inverting input of the operational amplifier OP is on an auxiliary voltage source U connected to a constant reference voltage provides, and the output of the operational amplifier OP is over a feedback branch Z to the inverting input of the operational amplifier OP fed back.
  • the operational amplifier carries out a target / actual value comparison of its input signals by.
  • the output signal of the operational amplifier OP influences the pulse duty factor of the pulse width modulation signals generated by the IC module IC, the to control the switching transistors T1, T2 of Serve as a push-pull converter.
  • the pulse duty factor of the pulse width modulation signals is also from the current electrical system voltage dependent on the motor vehicle.
  • Switch S2 is closed when the brake pedal in the motor vehicle is actuated.
  • the neon gas discharge lamp LP is now independent from the position of switch S1, operated as a brake light.
  • the push-pull converter T1, T2, W1, W2, W3 and its control device IC are connected to the low-voltage voltage source via connections A2 and A3, that is to the battery or the alternator of the motor vehicle connected, so that those controlled by the integrated circuit IC alternately Switching transistors T1, T2 of the push-pull converter using the Transformers W1, W2, W3 the low-voltage DC voltage supplied by the motor vehicle battery into a medium frequency AC voltage with a frequency of approx.
  • the Control device IC also generates during brake light operation the neon gas discharge lamp pulse width modulation signals for control the gate electrodes of the two switching transistors T1, T2.
  • Pulse width modulation on the one hand, changes or fluctuations the battery voltage in the motor vehicle is regulated and on the other hand via the operational amplifier OP contained in the integrated circuit and via the resistor R24 and via the feedback branch Z of the Operational amplifier OP a power control of the neon gas discharge lamp LP performed.
  • the electrical power consumption of the lamp LP during operation as a brake light to a value of approximately 20 W regulated.
  • branch point V1 in Load circuit using resistor R24 is proportional to the lamp current Voltage signal generated, decoupled from the load circuit and in Forward direction via the rectifier diode D3, the center tap V2 of the Voltage divider R21, R20 and the voltage divider resistor R20 led to the inverting input of the operational amplifier OP.
  • the lamp LP has a reduced signal compared to the tail light mode receives because with switch S2 closed and any position of the Switch S1 the base terminal of transistor switch Q with a control signal is applied, that a switching of the collector-emitter path of the transistor switch Q results.
  • the operational amplifier OP, the Feedback branch Z and the resistors R20, R24 also form during the brake light operation a control circuit for regulating the lamp current or to regulate the lamp power.
  • the operational amplifier OP in turn carries out a target / actual value comparison of its input signals, but with one opposite the tail light operation changed input signal at the inverting input of the operational amplifier OP.
  • the output signal of the operational amplifier OP influences the duty cycle of those generated by the IC chip IC Pulse width modulation signals used to control the switching transistors T1, T2 serve the push-pull converter.
  • the lamp power during brake light operation largely independent of changes in the vehicle electrical system voltage an approximately constant value of approx. 20 W can be regulated.
  • the pulse duty factor of the pulse width modulation signals is also also dependent on the current electrical system voltage of the motor vehicle.
  • the change from tail light to brake light operation of the neon gas discharge lamp LP is therefore accomplished in that the most inverting Input of the operational amplifier effective resistance of the voltage divider R21, R20 is switched using the transistor switch Q.
  • the voltage divider resistor is R21 ineffective, since the collector-emitter path of the transistor switch Q is high impedance.
  • the two voltage divider resistors are R21, R20 because of the now conductive collector-emitter path of the transistor switch Q connected in parallel.
  • FIG. 2 shows the complete circuit diagram of the circuit arrangement according to of the preferred embodiment.
  • a suitable dimensioning the components used are given in Table 2.
  • the connections J1, J2 are at the positive pole and the connection J3 is at the negative pole (ground) connected to the car battery.
  • the varistor V serves as overvoltage protection and the Schottky diodes D1, D2 protect the circuit arrangement in the event that plus and minus pole when connecting the circuit arrangement be exchanged.
  • Inductor L1 and capacitor C1 form an LC low-pass filter.
  • the electrolytic capacitors C2, C3 serve as buffer capacitors for the energy supply of the push-pull converter and its control device.
  • the push-pull converter consists of the two field effect transistors T1, T2, the transformer TR with its two Primary windings W1, W2 and its secondary winding W3 as well the capacitors C11, C12, C13.
  • the secondary winding W3 of the transformer TR feeds the load circuit, at whose connections J4, J5 the neon gas discharge lamp (not shown) is connected.
  • the control device of the push-pull converter consists of the integrated circuit IC1, which is connected to the gate electrodes of the field effect transistors T1, T2 connected outputs a pulse width modulation control of the Push-pull converter.
  • the integrated circuit IC1 also contains an operational amplifier, at the non-inverting input of one the components R2, R3, C6 and C7 existing auxiliary voltage source connected which generates a reference voltage of 1.8 V there.
  • the branch point V1 is across the rectifier diode D3 and the voltage divider resistors R10 and R7 to the inverting input of the integrated Circuit IC1 integrated operational amplifier connected.
  • the resistor R14 connected in the load circuit is used to detect the Lamp current. It generates a voltage drop proportional to the lamp current.
  • the control loop for regulating the lamp current and the Lamp power also includes that from resistors R7, R8, R9, R10 built-up voltage dividers and the components R5, R6, C9, C15 existing feedback branch, the output of the operational amplifier feeds back to its inverting input.
  • the change from the tail light to the brake light operation of the lamp is done with the Small signal bipolar transistor T3, the collector of which is connected to the resistor R8 and whose emitter is connected to ground.
  • the base terminal of the bipolar transistor T3 is connected to connection J2 via base board R11.
  • the components R1, C5, R4, C4 are used for power supply and for setting the clock frequency of the integrated circuit IC1 to approx. 35 kHz.
  • the connections M1 to M11 are all at ground potential.
  • the Circuit arrangement also has the important components for dimensioning R12, C16, C14 and C8.
  • This circuit arrangement allows changes in the vehicle electrical system voltage in the range of 9 V to 18 V, so that the lamp in this Range operated for both operating modes with approximately constant power can be.
  • Table 1 contains a summary of the operating data the various operating conditions for an on-board electrical system voltage of 13.5 V.
  • the system yield here is 11.7 lm / W.
  • the efficiency this circuit arrangement is greater than 80%.
  • the quotient of the Duty cycle of brake light and tail light operation is according to the Values in Table 1 are approximately 1.8.
  • the invention is not limited to the exemplary embodiment explained in more detail above.
  • the operating method according to the invention can also be applied to several, for example two, discharge lamps operated simultaneously. These simultaneously operated discharge lamps can be operated either on a single operating device or on two separate operating devices with the circuit arrangement according to the invention.
  • the operating method according to the invention is not only suitable for neon gas discharge lamps, but also, for example, for fluorescent lamps.
  • the push-pull converter can also be replaced by another suitable voltage converter.
  • the voltage drop across the lamp can also be used to regulate the lamp power instead of the lamp current.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
EP98103764A 1997-03-18 1998-03-04 Procédé et circuit pour alimenter au moins une lampe à décharge Withdrawn EP0866646A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19711183A DE19711183A1 (de) 1997-03-18 1997-03-18 Verfahren und Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe
DE19711183 1997-03-18

Publications (2)

Publication Number Publication Date
EP0866646A2 true EP0866646A2 (fr) 1998-09-23
EP0866646A3 EP0866646A3 (fr) 2000-05-31

Family

ID=7823738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98103764A Withdrawn EP0866646A3 (fr) 1997-03-18 1998-03-04 Procédé et circuit pour alimenter au moins une lampe à décharge

Country Status (6)

Country Link
US (1) US6411040B1 (fr)
EP (1) EP0866646A3 (fr)
JP (1) JPH10270190A (fr)
CA (1) CA2232328A1 (fr)
DE (1) DE19711183A1 (fr)
HU (1) HU219249B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000069227A1 (fr) * 1999-05-07 2000-11-16 Koninklijke Philips Electronics N.V. Systeme de ballast electronique pour decharge a haute intensite (dhi) a sortie a deux niveaux
FR2806247A1 (fr) * 2000-03-10 2001-09-14 Renault Procede de commande d'un dispositif d'alimentation d'une lampe a decharge
WO2002041670A2 (fr) * 2000-11-16 2002-05-23 Koninklijke Philips Electronics N.V. Circuit ondulateur symetrique llc pour retroeclairage lcd alimente en tension
EP1160127A3 (fr) * 2000-06-02 2004-01-07 Fioravanti S.r.l. Dispositif d'éclairage pour véhicule
WO2008071544A1 (fr) * 2006-12-15 2008-06-19 Osram Gesellschaft mit beschränkter Haftung Interface de commutation semi-nocturne pour un ballast électronique
WO2012062690A3 (fr) * 2010-11-10 2012-09-13 Osram Ag Procédé et dispositif pour faire fonctionner une lampe à décharge à haute intensité

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10160790A1 (de) * 2001-01-12 2002-08-08 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Einschalten einer Teilschaltungsanordnung
US6570344B2 (en) * 2001-05-07 2003-05-27 O2Micro International Limited Lamp grounding and leakage current detection system
JP4279033B2 (ja) * 2003-04-07 2009-06-17 三菱電機株式会社 車載ヘッドライト用の放電灯点灯装置
US7218063B2 (en) * 2005-05-27 2007-05-15 Osram Sylvania, Inc. Two light level ballast
JP2008275978A (ja) * 2007-05-01 2008-11-13 Funai Electric Co Ltd 液晶表示装置及び液晶テレビジョン
US8903577B2 (en) 2009-10-30 2014-12-02 Lsi Industries, Inc. Traction system for electrically powered vehicles
US8604709B2 (en) 2007-07-31 2013-12-10 Lsi Industries, Inc. Methods and systems for controlling electrical power to DC loads
US7598683B1 (en) 2007-07-31 2009-10-06 Lsi Industries, Inc. Control of light intensity using pulses of a fixed duration and frequency
US7446488B1 (en) 2007-08-29 2008-11-04 Osram Sylvania Metal halide lamp ballast controlled by remote enable switched bias supply
US20090200964A1 (en) * 2008-02-08 2009-08-13 King Ray J Methods And Apparatus For Dimmable Ballasts With A High Power Factor
US20090200951A1 (en) * 2008-02-08 2009-08-13 Purespectrum, Inc. Methods and Apparatus for Dimming Light Sources
US20090200953A1 (en) * 2008-02-08 2009-08-13 Ray James King Methods and apparatus for a high power factor ballast having high efficiency during normal operation and during dimming
US20090200952A1 (en) * 2008-02-08 2009-08-13 Purespectrum, Inc. Methods and apparatus for dimming light sources
DE102008016752A1 (de) * 2008-03-31 2009-10-01 Tridonicatco Schweiz Ag Erkennung der Belegung eines Anschlusses eines Betriebsgeräts für Leuchtmittel
US20100176733A1 (en) * 2009-01-14 2010-07-15 Purespectrum, Inc. Automated Dimming Methods and Systems For Lighting
US20100225239A1 (en) * 2009-03-04 2010-09-09 Purespectrum, Inc. Methods and apparatus for a high power factor, high efficiency, dimmable, rapid starting cold cathode lighting ballast

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GB2059693A (en) * 1979-10-05 1981-04-23 Werner K H J Vehicle power supplies
EP0449667A2 (fr) * 1990-03-30 1991-10-02 Bertonee Inc Commande numerique pour tube à décharge
EP0488002A1 (fr) * 1990-11-29 1992-06-03 Holzer, Walter, Senator h.c. Dr.h.c.Ing. Procédé et dispositif de commande de tubes à décharge par l'intermédiaire de ballasts électroniques
JPH06283282A (ja) * 1993-03-26 1994-10-07 Matsushita Electric Works Ltd 車輛用前照灯点灯装置

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US4322715A (en) * 1980-06-05 1982-03-30 Moon Charles G Automotive light circuit
US5491387A (en) * 1992-06-29 1996-02-13 Kansei Corporation Discharge lamp lighting circuit for increasing electric power fed in initial lighting of the lamp
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GB2059693A (en) * 1979-10-05 1981-04-23 Werner K H J Vehicle power supplies
EP0449667A2 (fr) * 1990-03-30 1991-10-02 Bertonee Inc Commande numerique pour tube à décharge
EP0488002A1 (fr) * 1990-11-29 1992-06-03 Holzer, Walter, Senator h.c. Dr.h.c.Ing. Procédé et dispositif de commande de tubes à décharge par l'intermédiaire de ballasts électroniques
JPH06283282A (ja) * 1993-03-26 1994-10-07 Matsushita Electric Works Ltd 車輛用前照灯点灯装置

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PATENT ABSTRACTS OF JAPAN vol. 1995, no. 01, 28. Februar 1995 (1995-02-28) & JP 06 283282 A (MATSUSHITA ELECTRIC WORKS LTD), 7. Oktober 1994 (1994-10-07) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000069227A1 (fr) * 1999-05-07 2000-11-16 Koninklijke Philips Electronics N.V. Systeme de ballast electronique pour decharge a haute intensite (dhi) a sortie a deux niveaux
US6204614B1 (en) 1999-05-07 2001-03-20 Philips Electronics North America Corporation Bi-level output electronic high intensity discharge (HID) ballast system
FR2806247A1 (fr) * 2000-03-10 2001-09-14 Renault Procede de commande d'un dispositif d'alimentation d'une lampe a decharge
EP1160127A3 (fr) * 2000-06-02 2004-01-07 Fioravanti S.r.l. Dispositif d'éclairage pour véhicule
WO2002041670A2 (fr) * 2000-11-16 2002-05-23 Koninklijke Philips Electronics N.V. Circuit ondulateur symetrique llc pour retroeclairage lcd alimente en tension
WO2002041670A3 (fr) * 2000-11-16 2002-07-18 Koninkl Philips Electronics Nv Circuit ondulateur symetrique llc pour retroeclairage lcd alimente en tension
CN100381022C (zh) * 2000-11-16 2008-04-09 皇家菲利浦电子有限公司 液晶显示器背光逆变器电路和液晶显示器设备
WO2008071544A1 (fr) * 2006-12-15 2008-06-19 Osram Gesellschaft mit beschränkter Haftung Interface de commutation semi-nocturne pour un ballast électronique
WO2012062690A3 (fr) * 2010-11-10 2012-09-13 Osram Ag Procédé et dispositif pour faire fonctionner une lampe à décharge à haute intensité

Also Published As

Publication number Publication date
HU219249B (en) 2001-03-28
HUP9800595A3 (en) 2000-03-28
CA2232328A1 (fr) 1998-09-18
EP0866646A3 (fr) 2000-05-31
DE19711183A1 (de) 1998-09-24
JPH10270190A (ja) 1998-10-09
US6411040B1 (en) 2002-06-25
HU9800595D0 (en) 1998-05-28
HUP9800595A2 (hu) 1998-10-28

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