EP1087644A1 - Improvements in driving of discharge lamps in particular for vehicle headlamps - Google Patents

Improvements in driving of discharge lamps in particular for vehicle headlamps Download PDF

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Publication number
EP1087644A1
EP1087644A1 EP00402459A EP00402459A EP1087644A1 EP 1087644 A1 EP1087644 A1 EP 1087644A1 EP 00402459 A EP00402459 A EP 00402459A EP 00402459 A EP00402459 A EP 00402459A EP 1087644 A1 EP1087644 A1 EP 1087644A1
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EP
European Patent Office
Prior art keywords
converter
power
lamp
continuous
input
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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.)
Granted
Application number
EP00402459A
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German (de)
French (fr)
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EP1087644B1 (en
Inventor
Daniel La Dret
Jean-Marc Nicolai
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Valeo Vision SAS
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Valeo Vision SAS
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    • 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
    • H05B41/288—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 without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions

Definitions

  • the present invention relates to the control of the supply of discharge lamps, in particular for motor vehicle headlamps.
  • this comprises a DC / DC converter 1, which supplies a DC / AC converter 2 which itself supplies a discharge lamp 3.
  • the DC / DC converter 1 includes for example a transformer T and a switch Q1 which controls the supply of the primary of transformer T, this switch Q1 being itself controlled by a regulator 4.
  • the switches, referenced by Q2, of the H-bridge which constitutes the 2 DC / AC converter are controlled by a circuit control 5 with clock.
  • the switching frequency of the converter switches DC / AC is around 200 Hz to 1 kHz.
  • An object of the invention is to propose a command which allows eliminate or at least greatly reduce this electromagnetic noise.
  • a solution to reduce the electromagnetic noise generated by the alternative supply of a discharge lamp would therefore be modify the control of the switches of its converter continuous / alternating, to broaden its switching frequency spectrum.
  • the invention proposes a method for controlling a device for supplying a discharge lamp, in particular a projector motor vehicle, said power supply device comprising a DC / AC converter, which modulates over time the power supply supplied to said DC / AC converter.
  • the supply power supplied to the DC / AC converter is modulated in a sequence pseudo-random.
  • Such a method has the advantage of using spreading spectrum which allows noise reduction or suppression electromagnetic and this without modifying the control of DC / AC converter switches.
  • the invention further provides a lamp supply device for motor vehicle discharge comprising a converter continuous / alternating and means for generating a power supply which is transmitted to the input of the DC / AC converter, in which said means include means for modulating said power feed.
  • the means for generating the power of power which is transmitted to the input of the DC / AC converter include a DC / DC converter and regulating means and said regulation means control the DC / DC converter so that it delivers modulated power.
  • the means for generating the supply power which is transmitted at the input of the DC / AC converter have a DC / DC converter and the device includes means for add to the output power of the DC / DC converter a modulated differential power.
  • the regulator 4 controls the transistor Q1 of the DC / DC converter 1, so that what it delivers at the input of the DC / AC converter 2 a power P ⁇ ⁇ P, where P is the average power to be delivered to the lamp 3 and where ⁇ ⁇ P is a modulation added to the power delivered to the DC / AC converter to widen the spectrum of the circulating current in the discharge lamp 3.
  • this variant is of an embodiment particularly advantageous, insofar as it requires only one simple re-programming of the power regulator 4.
  • the modulation of power will be done in a pseudo-random sequence.
  • the differential power can be more or minus 500 mw for average power output from the converter continuous / continuous of the order of 35 w.
  • the modulation of power may not be generated by regulator 4, but may be generated by independent means (module 6 in FIG. 3) and added to analog way at the output of the DC / AC converter 2.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The incoming supply is received by a DC/DC converter (1), the input being derived through a switching transistor (Q1) which controls the primary of a transformer (T). The converter output forms the input to a DC/AC converter, supplying the lamp. This converter's bridge rectifier employs transistors switched at frequencies in the range 200-1000 Hz and gives rise to significant electromagnetic interference. The switching of the DC/DC converter transistor is controlled by a regulator (4). By suitably programming the latter, the power delivered to the lamp is modulated in a pseudo-random sequence by a fractional amount, e.g. plus or minus 500 mW on a mean power of 35 W, the resulting frequency spectrum spread substantially reducing the interference, typically by up to 8 dB. Opt., modulation is achieved by the analogue addition of a separately generated power increment/decrement at the output of the DC/DC converter.

Description

La présente invention est relative à la commande de l'alimentation de lampes à décharge, notamment de projecteurs de véhicules automobiles.The present invention relates to the control of the supply of discharge lamps, in particular for motor vehicle headlamps.

On a représenté schématiquement sur la figure 1 un dispositif d'alimentation de lampe à décharge de projecteur de véhicule automobile.There is shown schematically in Figure 1 a device motor vehicle headlight discharge lamp supply.

Classiquement, celui-ci comporte un convertisseur 1 continu/continu, qui alimente un convertisseur 2 continu/alternatif qui lui-même alimente une lampe à décharge 3.Conventionally, this comprises a DC / DC converter 1, which supplies a DC / AC converter 2 which itself supplies a discharge lamp 3.

Le convertisseur 1 continu/continu comporte par exemple un transformateur T et un interrupteur Q1 qui commande l'alimentation du primaire du transformateur T, cet interrupteur Q1 étant lui-même commandé par un régulateur 4.The DC / DC converter 1 includes for example a transformer T and a switch Q1 which controls the supply of the primary of transformer T, this switch Q1 being itself controlled by a regulator 4.

Les interrupteurs, référencés par Q2, du pont en H qui constitue le convertisseur 2 continu/alternatif sont commandés par un circuit de commande 5 à horloge.The switches, referenced by Q2, of the H-bridge which constitutes the 2 DC / AC converter are controlled by a circuit control 5 with clock.

La fréquence de commutation des interrupteurs du convertisseur continu/alternatif est de l'ordre de 200 Hz à 1 kHz.The switching frequency of the converter switches DC / AC is around 200 Hz to 1 kHz.

Toutefois, une telle alimentation basse fréquence est à l'origine d'un bruit électromagnétique important.However, such a low frequency power supply is the source of a significant electromagnetic noise.

Un but de l'invention est de proposer une commande qui permette de supprimer ou à tout le moins fortement diminuer ce bruit électromagnétique.An object of the invention is to propose a command which allows eliminate or at least greatly reduce this electromagnetic noise.

On sait de façon générale en électronique que l'on peut fortement diminuer le bruit électromagnétique généré par un circuit de puissance à commutation en élargissant le spectre des fréquences de commande.We generally know in electronics that we can strongly reduce the electromagnetic noise generated by a power circuit to switching by widening the spectrum of control frequencies.

On pourra à cet égard par exemple se référer aux articles suivants :

  • « The Effect of Carrier Frequency Modulation of PWM Waveforms on Conducted EMC Problems in switched Mode Power Supplies » - David Stone & Barry Chambers, University of Sheffield, Department of Electronic and Electrical Engineering ; EPE Journal, vol.5 n°3/4, January 1996 ;
  • « Effect of Spread-spectrum Modulation of Switched Mode Power Converter PWM Carrier Frequencies on Conducted EMI » - David Stone & Barry Chambers, University of Sheffield, Department of Electronic and Electrical Engineering; IEE 16 March 1995, Electronics Letters n° 19950543 ;
  • « Random Carrier Frequency Modulation of EMC Problems in Switched Mode Power Supplies » - David Stone, Barry Chambers & David Howe, University of Sheffield, Department of Electronic and Electrical Engineering ; IEEE Catalogue n°95TH8025 1995.
In this regard, for example, we can refer to the following articles:
  • "The Effect of Carrier Frequency Modulation of PWM Waveforms on Conducted EMC Problems in switched Mode Power Supplies" - David Stone & Barry Chambers, University of Sheffield, Department of Electronic and Electrical Engineering; EPE Journal, vol.5 no.3 / 4, January 1996;
  • "Effect of Spread-spectrum Modulation of Switched Mode Power Converter PWM Carrier Frequencies on Conducted EMI" - David Stone & Barry Chambers, University of Sheffield, Department of Electronic and Electrical Engineering; IEE 16 March 1995, Electronics Letters No. 19950543;
  • "Random Carrier Frequency Modulation of EMC Problems in Switched Mode Power Supplies" - David Stone, Barry Chambers & David Howe, University of Sheffield, Department of Electronic and Electrical Engineering; IEEE Catalog No. 95TH8025 1995.

Une solution pour réduire le bruit électromagnétique généré par l'alimentation alternative d'une lampe à décharge serait par conséquent de modifier la commande des interrupteurs de son convertisseur continu/alternatif, pour élargir son spectre de fréquence de commutation.A solution to reduce the electromagnetic noise generated by the alternative supply of a discharge lamp would therefore be modify the control of the switches of its converter continuous / alternating, to broaden its switching frequency spectrum.

L'invention propose quant à elle un procédé pour la commande d'un dispositif d'alimentation d'une lampe à décharge notamment de projecteur de véhicule automobile, ledit dispositif d'alimentation comportant un convertisseur continu/alternatif, selon lequel on module dans le temps la puissance d'alimentation fournie audit convertisseur continu/alternatif.The invention proposes a method for controlling a device for supplying a discharge lamp, in particular a projector motor vehicle, said power supply device comprising a DC / AC converter, which modulates over time the power supply supplied to said DC / AC converter.

Avantageusement, notamment, la puissance d'alimentation fournie au convertisseur continu/alternatif est modulée selon une séquence pseudo-aléatoire.Advantageously, in particular, the supply power supplied to the DC / AC converter is modulated in a sequence pseudo-random.

Un tel procédé présente l'avantage de mettre en oeuvre un étalement de spectre qui permet une diminution ou suppression du bruit électromagnétique et ce sans modification de la commande des interrupteurs du convertisseur continu/alternatif.Such a method has the advantage of using spreading spectrum which allows noise reduction or suppression electromagnetic and this without modifying the control of DC / AC converter switches.

L'invention propose en outre un dispositif d'alimentation de lampe à décharge de véhicule automobile comportant un convertisseur continu/alternatif et des moyens pour générer une puissance d'alimentation qui est transmise en entrée du convertisseur continu/alternatif, dans lequel lesdits moyens comportent des moyens pour moduler ladite puissance d'alimentation.The invention further provides a lamp supply device for motor vehicle discharge comprising a converter continuous / alternating and means for generating a power supply which is transmitted to the input of the DC / AC converter, in which said means include means for modulating said power feed.

Avantageusement, les moyens pour générer la puissance d'alimentation qui est transmise en entrée du convertisseur continu/alternatif comportent un convertisseur continu/continu et des moyens de régulation et lesdits moyens de régulation commandent le convertisseur continu/continu de façon à ce qu'il délivre une puissance modulée.Advantageously, the means for generating the power of power which is transmitted to the input of the DC / AC converter include a DC / DC converter and regulating means and said regulation means control the DC / DC converter so that it delivers modulated power.

En variante, les moyens pour générer la puissance d'alimentation qui est transmise en entrée du convertisseur continu/alternatif comportent un convertisseur continu/continu et le dispositif comporte des moyens pour additionner à la puissance en sortie du convertisseur continu/continu une puissance différentielle modulée.As a variant, the means for generating the supply power which is transmitted at the input of the DC / AC converter have a DC / DC converter and the device includes means for add to the output power of the DC / DC converter a modulated differential power.

D'autres caractéristiques et avantages de l'invention ressortiront encore de la description qui suit. Cette description est purement illustrative et non limitative et doit être lue en regard des dessins annexés sur lesquels :

  • la figure 1, déjà analysée, est une représentation schématique d'un dispositif d'alimentation de lampe à décharge ;
  • la figure 2 représente schématiquement un mode de réalisation possible pour l'invention ;
  • la figure 3 représente schématiquement un autre mode de réalisation possible pour l'invention.
Other characteristics and advantages of the invention will emerge from the description which follows. This description is purely illustrative and not limiting and should be read with reference to the appended drawings in which:
  • Figure 1, already analyzed, is a schematic representation of a discharge lamp supply device;
  • FIG. 2 schematically represents a possible embodiment for the invention;
  • FIG. 3 schematically represents another possible embodiment for the invention.

Selon le mode de réalisation illustré sur la figure 2, le régulateur 4 commande le transistor Q1 du convertisseur 1 continu/continu, de façon à ce qu'il délivre en entrée du convertisseur 2 continu/alternatif une puissance P ± ΔP, où P est la puissance moyenne qui doit être délivrée à la lampe 3 et où ± ΔP est une modulation ajoutée à la puissance délivrée au convertisseur continu/alternatif pour élargir le spectre du courant circulant dans la lampe à décharge 3.According to the embodiment illustrated in FIG. 2, the regulator 4 controls the transistor Q1 of the DC / DC converter 1, so that what it delivers at the input of the DC / AC converter 2 a power P ± ΔP, where P is the average power to be delivered to the lamp 3 and where ± ΔP is a modulation added to the power delivered to the DC / AC converter to widen the spectrum of the circulating current in the discharge lamp 3.

On sait en effet que la puissance P qui traverse la lampe est telle que : P = 1/2 Ll2f où L est l'inductance du circuit dans lequel se trouve la lampe, I l'intensité de courant qui traverse la lampe et f la fréquence de ce courant. We know indeed that the power P which crosses the lamp is such that: P = 1/2 Ll 2 f where L is the inductance of the circuit in which the lamp is located, I the intensity of current which crosses the lamp and f the frequency of this current.

Ainsi, en modulant la puissance en entrée du convertisseur continu/alternatif 2, on élargit le spectre de fréquence du courant circulant dans la lampe à décharge 3.Thus, by modulating the input power of the converter continuous / alternating 2, the frequency spectrum of the circulating current is widened in the discharge lamp 3.

Comme on l'aura compris, cette variante est d'une réalisation particulièrement avantageuse, dans la mesure où elle ne nécessite qu'une simple re- programmation du régulateur de puissance 4.As will be understood, this variant is of an embodiment particularly advantageous, insofar as it requires only one simple re-programming of the power regulator 4.

Par ailleurs, de façon particulièrement préférée, la modulation de puissance se fera selon une séquence pseudo-aléatoire.Furthermore, particularly preferably, the modulation of power will be done in a pseudo-random sequence.

Ceci correspond à un cas d'étalement de spectre tout à fait favorable, puisque cela revient à additionner un bruit blanc à la commutation générée par le convertisseur 2.This corresponds to a completely favorable spectrum spreading case, since this amounts to adding white noise to the generated switching by converter 2.

A titre d'exemple, la puissance différentielle peut être de plus ou moins 500 mw pour une puissance moyenne en sortie du convertisseur continu/continu de l'ordre de 35 w.As an example, the differential power can be more or minus 500 mw for average power output from the converter continuous / continuous of the order of 35 w.

Avec une telle modulation, on réalise un étalement de spectre qui permet de fortement limiter les niveaux d'émission des perturbations qui génèrent des rayonnements électromagnétiques sur le fondamental et les harmoniques de l'alimentation à découpage.With such a modulation, a spectrum spread is produced which greatly limits the emission levels of disturbances which generate electromagnetic radiation on the fundamental and switching power supply harmonics.

Ainsi, on arrive à baisser le bruit électromagnétique de 8dB sur sensiblement l'ensemble du spectre pris en compte pour caractériser le bruit électromagnétique dans le domaine de l'automobile.Thus, we manage to lower the electromagnetic noise by 8dB on substantially the entire spectrum taken into account to characterize the electromagnetic noise in the automotive field.

D'autres variantes de réalisation que celles de la figure 2 sont bien entendu envisageables.Other variant embodiments than those of FIG. 2 are indeed heard possible.

Notamment, ainsi qu'illustré sur la figure 3, la modulation de puissance peut ne pas être générée par le régulateur 4, mais être générée par des moyens indépendants (module 6 sur la figure 3) et additionnée de façon analogique à la sortie du convertisseur 2 continu/alternatif.In particular, as illustrated in FIG. 3, the modulation of power may not be generated by regulator 4, but may be generated by independent means (module 6 in FIG. 3) and added to analog way at the output of the DC / AC converter 2.

Claims (5)

Procédé pour la commande d'un dispositif d'alimentation d'une lampe à décharge notamment de projecteur de véhicule automobile, ledit dispositif d'alimentation comportant un convertisseur continu/alternatif, caractérisé en ce qu'on module dans le temps la puissance d'alimentation fournie audit convertisseur continu/alternatif.Method for controlling a supply device of a discharge lamp, in particular of a motor vehicle headlamp, said lamp supply device comprising a DC / AC converter, characterized in that the power supply is modulated over time supplied to said DC / AC converter. Procédé selon la revendication 1, caractérisé en ce que la puissance d'alimentation fournie au convertisseur continu/alternatif est modulée selon une séquence pseudo-aéatoire.Method according to claim 1, characterized in that the power supplied to the DC / AC converter is modulated according to a pseudo-random sequence. Dispositif d'alimentation d'une lampe à décharge notamment de projecteur de véhicule automobile comporte un convertisseur continu/alternatif et des moyens pour générer une puissance d'alimentation qui est transmise en entrée du convertisseur continu/alternatif, caractérisé en ce que lesdits moyens comportent des moyens pour moduler ladite puissance d'alimentation.Device for supplying a discharge lamp, in particular motor vehicle headlamp has a converter continuous / alternating and means for generating a power supply which is transmitted to the input of the DC / AC converter, characterized in that said means include means for modulating said power supply. Dispositif selon la revendication 3, caractérisé en ce que les moyens pour générer la puissance d'alimentation qui est transmise en entrée du convertisseur continu/alternatif comportent un convertisseur continu/continu et des moyens de régulation et en ce que lesdits moyens de régulation commandent le convertisseur continu/continu de façon à ce qu'il délivre une puissance modulée.Device according to claim 3, characterized in that the means for generating the power supply which is transmitted in DC / AC converter input include converter continuous / continuous and means of regulation and in that said means of regulation control the DC / DC converter so that it delivers modulated power. Dispositif selon la revendication 3, caractérisé en ce que les moyens pour générer la puissance d'alimentation qui est transmise en entrée du convertisseur continu/alternatif comportent un convertisseur continu/continu et en ce que ledit dispositif comporte des moyens pour additionner à la puissance en sortie du convertisseur continu/continu une puissance différentielle modulée.Device according to claim 3, characterized in that the means for generating the power supply which is transmitted in DC / AC converter input include converter continuous / continuous and in that said device comprises means for add to the output power of the DC / DC converter a modulated differential power.
EP00402459A 1999-09-27 2000-09-06 Improvements in driving of discharge lamps in particular for vehicle headlamps Expired - Lifetime EP1087644B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9912114A FR2799062B1 (en) 1999-09-27 1999-09-27 IMPROVEMENTS IN ORDERING THE SUPPLY OF DISCHARGE LAMPS, ESPECIALLY A MOTOR VEHICLE PROJECTOR
FR9912114 1999-09-27

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EP1087644A1 true EP1087644A1 (en) 2001-03-28
EP1087644B1 EP1087644B1 (en) 2006-11-02

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EP00402459A Expired - Lifetime EP1087644B1 (en) 1999-09-27 2000-09-06 Improvements in driving of discharge lamps in particular for vehicle headlamps

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US (1) US6556463B1 (en)
EP (1) EP1087644B1 (en)
JP (1) JP4542251B2 (en)
DE (1) DE60031620T2 (en)
ES (1) ES2275478T3 (en)
FR (1) FR2799062B1 (en)

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KR100437369B1 (en) 2001-01-10 2004-06-25 삼성광주전자 주식회사 Cyclone dust-collecting apparatus for Vacuum Cleaner
WO2006000932A1 (en) * 2004-06-21 2006-01-05 Koninklijke Philips Electronics N.V. Method and driving circuit for operating a hid lamp
FR2881016B1 (en) * 2005-01-17 2007-03-16 Valeo Vision Sa DISCHARGE LAMP BALLAST, IN PARTICULAR FOR A VEHICLE PROJECTOR
BRPI0601239A (en) * 2006-04-06 2007-12-04 Univ Fed De Santa Catarina Ufsc high frequency pulsed discharge lamp supply

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EP0944294A2 (en) * 1998-03-18 1999-09-22 Matsushita Electric Industrial Co., Ltd. Operating apparatus of discharge lamp

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EP0744883A1 (en) * 1995-05-23 1996-11-27 PRÄZISA Industrieelektronik GmbH Device and process for operating a high pressure discharge lamp
EP0785702A2 (en) * 1996-01-16 1997-07-23 Osram Sylvania Inc. Methods and apparatus for operating a discharge lamp
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JP2001157463A (en) 2001-06-08
DE60031620T2 (en) 2007-09-06
JP4542251B2 (en) 2010-09-08
ES2275478T3 (en) 2007-06-16
DE60031620D1 (en) 2006-12-14
FR2799062A1 (en) 2001-03-30
FR2799062B1 (en) 2001-12-21
EP1087644B1 (en) 2006-11-02
US6556463B1 (en) 2003-04-29

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