EP1087644B1 - 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
EP1087644B1
EP1087644B1 EP00402459A EP00402459A EP1087644B1 EP 1087644 B1 EP1087644 B1 EP 1087644B1 EP 00402459 A EP00402459 A EP 00402459A EP 00402459 A EP00402459 A EP 00402459A EP 1087644 B1 EP1087644 B1 EP 1087644B1
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Prior art keywords
converter
power
supply
modulation
discharge lamp
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Expired - Lifetime
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EP00402459A
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German (de)
French (fr)
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EP1087644A1 (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, including motor vehicle headlights.
  • FIG. 1 diagrammatically shows a motor vehicle headlight discharge lamp supply device.
  • the DC / DC converter 1 comprises, for example, a transformer T and a switch Q1 which controls the supply of the primary of the transformer T, this switch Q1 being itself controlled by a regulator 4.
  • the switches, referenced Q2, H bridge that constitutes the DC / AC converter 2 are controlled by a control circuit 5 clock.
  • the switching frequency of the DC / AC converter switches is of the order of 200 Hz to 1 kHz.
  • An object of the invention is to propose a control that makes it possible to suppress or at the very least greatly reduce this electromagnetic noise.
  • a solution for reducing the electromagnetic noise generated by the AC power supply of a discharge lamp would therefore be to modify the control of the switches of its DC / AC converter, to widen its switching frequency spectrum.
  • EP-0744883 discloses a discharge lamp power supply device in which a DC / AC converter is controlled by a voltage / frequency converter. Power regulation and modulation means are provided and vary the signal delivered by the voltage / frequency converter to the DC-AC converter.
  • EP-0291223 discloses a discharge lamp supply device comprising a switching bridge with a plurality of switches, a frequency generator and an LC circuit.
  • the bridge is powered by a constant DC voltage.
  • the frequency generator delivers a modulated signal that controls the switches of the bridge. The modulation of the signal applied to the switches of the bridge opposes the appearance of an acoustic resonance in the lamp.
  • the invention furthermore proposes a device for supplying a discharge lamp, especially a motor vehicle headlamp, comprising a DC / DC converter and a DC / AC converter, the DC / DC converter supplying power to the DC converter.
  • a device for supplying a discharge lamp especially a motor vehicle headlamp, comprising a DC / DC converter and a DC / AC converter, the DC / DC converter supplying power to the DC converter.
  • it comprises power supply modulation means associated with the DC / DC converter for temporally modulating the power supply so as to widen the spectrum of the current flowing in the discharge lamp without modify the switch control included in the DC / AC converter.
  • Such a device has the advantage of implementing a spread spectrum that allows a reduction or elimination of electromagnetic noise without changing the control of the switches of the DC / AC converter.
  • the device comprises regulating means provided for controlling the DC / DC converter so as to deliver a modulated power thereto.
  • the power supply modulation means comprise means for adding a modulated differential power to the power delivered at the output of the DC / DC converter.
  • the power supply supplied to the DC / AC converter is modulated according to a pseudo-random sequence.
  • the regulator 4 controls the transistor Q1 of the DC / DC converter 1, so that it delivers at 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 supplied to the DC / AC converter to widen the spectrum of the current flowing in the discharge lamp 3.
  • this variant is of a particularly advantageous embodiment, insofar as it only requires a simple re-programming of the power regulator 4.
  • the power modulation will be in a pseudo-random sequence.
  • the differential power can be plus or minus 500 mw for an average output power of the DC / DC converter of the order of 35 w.
  • the power modulation may not be generated by the regulator 4, but may be generated by independent means (module 6 in FIG. 3) and added in an analog manner to the output of the converter. 1 continuous / continuous.

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, including motor vehicle headlights.

On a représenté schématiquement sur la figure 1 un dispositif d'alimentation de lampe à décharge de projecteur de véhicule automobile.FIG. 1 diagrammatically shows a motor vehicle headlight discharge lamp supply device.

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, it 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 comprises, for example, a transformer T and a switch Q1 which controls the supply of the primary of the 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 Q2, H bridge that constitutes the DC / AC converter 2 are controlled by a control circuit 5 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 DC / AC converter switches is of the order of 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 at the origin of 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 control that makes it possible to suppress or at the very 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.It is generally known in electronics that the electromagnetic noise generated by a switching power circuit can be greatly reduced by enlarging the spectrum of the 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, reference may be made to the following articles:
  • "The Effect of Carrier Frequency Modulation 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 PWM Carrier Frequencies on Conducted EMI Power Converter Mode" - 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 Power Mode Switched 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 for reducing the electromagnetic noise generated by the AC power supply of a discharge lamp would therefore be to modify the control of the switches of its DC / AC converter, to widen its switching frequency spectrum.

Ainsi, le document EP-0744883 décrit un dispositif d'alimentation de lampe à décharge dans lequel un convertisseur continu/altematif est commandé par un convertisseur tension/fréquence. Des moyens de régulation de puissance et de modulation sont prévus et font varier le signal délivré par le convertisseur tension/fréquence au convertisseur continu-alternatif.Thus, EP-0744883 discloses a discharge lamp power supply device in which a DC / AC converter is controlled by a voltage / frequency converter. Power regulation and modulation means are provided and vary the signal delivered by the voltage / frequency converter to the DC-AC converter.

Le document EP-0291223 décrit un dispositif d'alimentation de lampe à décharge comprenant un pont de commutation avec plusieurs interrupteurs, un générateur de fréquence et un circuit LC. Le pont est alimenté par une tension continue constante. Le générateur de fréquence délivre un signal modulé qui commande les interrupteurs du pont. La modulation du signal appliqué sur les interrupteurs du pont s'oppose à l'apparition d'une résonance acoustique dans la lampe.EP-0291223 discloses a discharge lamp supply device comprising a switching bridge with a plurality of switches, a frequency generator and an LC circuit. The bridge is powered by a constant DC voltage. The frequency generator delivers a modulated signal that controls the switches of the bridge. The modulation of the signal applied to the switches of the bridge opposes the appearance of an acoustic resonance in the lamp.

L'invention propose en outre un dispositif d'alimentation d'une lampe à décharge notamment de projecteur de véhicule automobile comportant un convertisseur continu/continu et un convertisseur continu/altematif, le convertisseur continu/continu fournissant une puissance d'alimentation au convertisseur continu/alternatif, caractérisé en ce qu'il comprend des moyens de modulation de puissance d'alimentation associés au convertisseur continu/continu pour moduler dans le temps la puissance d'alimentation de façon à élargir le spectre du courant circulant dans la lampe à décharge sans modifier la commande d'interrupteurs compris dans le convertisseur continu/alternatif.The invention furthermore proposes a device for supplying a discharge lamp, especially a motor vehicle headlamp, comprising a DC / DC converter and a DC / AC converter, the DC / DC converter supplying power to the DC converter. / alternative, characterized in that it comprises power supply modulation means associated with the DC / DC converter for temporally modulating the power supply so as to widen the spectrum of the current flowing in the discharge lamp without modify the switch control included in the DC / AC converter.

Un tel dispositif 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 device has the advantage of implementing a spread spectrum that allows a reduction or elimination of electromagnetic noise without changing the control of the switches of the DC / AC converter.

Avantageusement, le dispositif comprend des moyens de régulation prévus pour commander le convertisseur continu/continu de façon à lui faire délivrer une puissance modulée.Advantageously, the device comprises regulating means provided for controlling the DC / DC converter so as to deliver a modulated power thereto.

En variante, les moyens de modulation de puissance d'alimentation comportent des moyens pour additionner à la puissance délivrée en sortie du convertisseur continu/continu une puissance différentielle modulée.In a variant, the power supply modulation means comprise means for adding a modulated differential power to the power delivered at the output of the DC / DC converter.

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

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 features and advantages of the invention will become apparent from the description which follows. This description is purely illustrative and not limiting and should be read with reference to the accompanying drawings in which:
  • FIG. 1, already analyzed, is a schematic representation of a discharge lamp supply device;
  • Figure 2 shows schematically a possible embodiment for the invention;
  • Figure 3 shows schematically 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 it delivers at 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 supplied to the DC / AC converter to widen the spectrum of the current flowing in the discharge lamp 3.

On sait en effet que la puissance P qui traverse la lampe est telle que : P = 1 / 2 L I 2 f

Figure imgb0001

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.It is known that the power P which passes through the lamp is such that: P = 1 / two The I two f
Figure imgb0001
where L is the inductance of the circuit in which the lamp is located, the intensity of current flowing through the lamp and 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 DC / AC converter 2, the frequency spectrum of the current flowing in the discharge lamp 3 is widened.

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 a particularly advantageous embodiment, insofar as it only requires a 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.Moreover, particularly preferably, the power modulation will be 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 case of spreading of spectrum quite favorable, since it amounts to adding a white noise to the commutation generated by the 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.By way of example, the differential power can be plus or minus 500 mw for an average output power of the DC / DC converter 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 made which makes it possible to strongly limit the emission levels of the disturbances which generate electromagnetic radiation on the fundamental and the harmonics of the switching power supply.

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, it is possible to reduce the electromagnetic noise of 8 dB over 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 embodiments than those of Figure 2 are of course conceivable.

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 1 continu/continu.In particular, as illustrated in FIG. 3, the power modulation may not be generated by the regulator 4, but may be generated by independent means (module 6 in FIG. 3) and added in an analog manner to the output of the converter. 1 continuous / continuous.

Claims (4)

  1. Device for supplying a discharge lamp (3) for a motor vehicle headlight comprising a DC/DC converter (1) and a DC/AC converter (2), the said DC/DC converter (1) supplying a supply power to the said DC/AC converter (2), characterised in that it comprises means for supply-power modulation (4, 6, P±ΔP) associated with the said DC/DC converter in order to modulate the said supply power over time so as to broaden the spectrum of the current flowing in the said discharge lamp (3) without modifying the control of switches (Q2) included in the said DC/AC converter (2).
  2. Device according to claim 1, characterised in that it comprises regulation means (4) designed to control the said DC/DC converter (1) so as to cause it to deliver a modulated power.
  3. Device according to claim 1, characterised in that the said supply-power modulation means (P±ΔP) comprise means (6) for adding a modulated differential power to the power delivered at the output of the DC/DC converter.
  4. Device according to any one of claims 1 to 3, characterised in that in that the supply power supplied to the DC/AC converter (2) is modulated according to a pseudo-random sequence.
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
FR9912114 1999-09-27
FR9912114A FR2799062B1 (en) 1999-09-27 1999-09-27 IMPROVEMENTS IN ORDERING THE SUPPLY OF DISCHARGE LAMPS, ESPECIALLY A MOTOR VEHICLE PROJECTOR

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

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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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US3737756A (en) * 1972-05-15 1973-06-05 Bell Telephone Labor Inc Converter circuit with balanced parallel switching paths
GB8711131D0 (en) * 1987-05-12 1987-06-17 Emi Plc Thorn Power supply
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JPH0855685A (en) * 1994-08-15 1996-02-27 Matsushita Electric Works Ltd Power supply device
EP0744883B1 (en) * 1995-05-23 2004-03-03 PRÄZISA Industrieelektronik GmbH Device and process for operating a high pressure discharge lamp
US5696670A (en) * 1995-05-26 1997-12-09 Webster Heating And Specialty Products, Inc. Power supply for arc-discharge load
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US6144172A (en) * 1999-05-14 2000-11-07 Matsushita Electric Works R&D Laboratory, Inc. Method and driving circuit for HID lamp electronic ballast

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FR2799062A1 (en) 2001-03-30
ES2275478T3 (en) 2007-06-16
EP1087644A1 (en) 2001-03-28
DE60031620D1 (en) 2006-12-14
FR2799062B1 (en) 2001-12-21
JP2001157463A (en) 2001-06-08
JP4542251B2 (en) 2010-09-08
US6556463B1 (en) 2003-04-29
DE60031620T2 (en) 2007-09-06

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