EP0681415B1 - Dispositif d'alimentation de lampe à décharge, notamment pour l'éclairage intérieur ou la signalisation de véhicule - Google Patents
Dispositif d'alimentation de lampe à décharge, notamment pour l'éclairage intérieur ou la signalisation de véhicule Download PDFInfo
- Publication number
- EP0681415B1 EP0681415B1 EP19950401028 EP95401028A EP0681415B1 EP 0681415 B1 EP0681415 B1 EP 0681415B1 EP 19950401028 EP19950401028 EP 19950401028 EP 95401028 A EP95401028 A EP 95401028A EP 0681415 B1 EP0681415 B1 EP 0681415B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- amplifier
- voltage
- discharge lamp
- oscillator
- 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.)
- Expired - Lifetime
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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
- H05B41/26—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
- H05B41/282—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
- H05B41/2821—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 by means of a single-switch converter or a parallel push-pull converter in the final stage
Definitions
- the present invention relates to a device for supplying a discharge type lamp. She advantageously finds application for feeding discharge lamps used for interior lighting or signaling of vehicles, in particular motor vehicles.
- tubes or lamps with discharge, fluorescent or not, low power for carry out interior lighting or signaling vehicles.
- a main object of the invention is to solve these problems.
- the invention provides a device for the supply of a discharge lamp, characterized in that it comprises, on the one hand, an oscillator delivering a signal that is sinusoidal or has little significant harmonics and has no fronts steep, and, on the other hand, an amplifier receiving in input the oscillator signal and supplying output the discharge lamp, the operation of this amplifier being linear when the lamp is on.
- the semiconductor components of the assembly operating in linear regime it is possible reach high frequencies even with inexpensive components (bipolar transistors by example).
- the volume of the transformer of the amplifier can be made very small. He is leaving the same for the complete circuit, the transformer being the largest item.
- the losses in this type of assembly are located in the transistors.
- the heat can be easily removed, the mounting of transistors on radiator, by means of screws or locking elements elastic, being a technique well mastered by man of career.
- the invention proposes in a preferred embodiment, to use a amplifier, which, when the lamp is not on, operates on a nonlinear transient regime, where it generates voltage pulses for the ignition of the discharge lamp.
- the amplifier may have a gain high enough to provide the lamp with a ignition voltage; a pulse generator can also be mounted in series with the lamp.
- Circuit 1 for supplying a lamp discharge type 2, shown therein, includes a oscillator 3 delivering a sinusoidal input voltage to a linear amplifier 4 on the outputs of which is mounted lamp 2.
- oscillator 3 delivering a sinusoidal input voltage to a linear amplifier 4 on the outputs of which is mounted lamp 2.
- a non-sinusoidal oscillator 3 if the signals delivered have few significant harmonics and are devoid of stiff foreheads.
- FIG. 2 illustrates a mode of preferred embodiment of the invention.
- Amplifier 4 shown is a Class A amplifier, having a single transistor (referenced by 5), to minimize the cost of the converter.
- the collector of transistor 5 is connected to the primary winding 6a of a transformer 6, of which the secondary winding has been referenced by 6b.
- the emitter of transistor 5 is connected to a resistance 7.
- a constant voltage E is imposed by a source voltage 8 (battery on a motor vehicle) between the other ends of the primary winding 6a and of resistance 7.
- the oscillator which was not shown on this figure 2 so as not to burden the drawings, provides a control voltage Vcom between the base of the transistor 5 and the end of resistor 7 connected to the source 8.
- lamp 2 When lamp 2 is on, its operation is assimilated to that of a resistance. This approximation is particularly justified when the frequency of the discharge is greater than a few tens of kiloherz.
- FIG. 4 represents, for E, L ⁇ , R, Vd, Vc 1 and ⁇ fixed, the curve giving this peak value V1 as a function of Vc 2 . Addiction is almost linear.
- Vc 2 so as to obtain a peak voltage at the primary winding 6a of the transformer 6 clearly greater than the supply voltage.
- the arrow in Figure 4 indicates the point where ⁇ t1 is equal to 3 ⁇ / 2.
- the overvoltage thus obtained is in practice limited by transformer saturation current and / or the direct breakdown voltage of the transistor.
- Vc 2 1 L ⁇ E R 2 E 4 + (L ⁇ RVnin) 2 where in and vn are the nominal current and voltage in the lamp.
- the value of the resistance R is advantageously chosen small, so as to minimize the losses.
- the power consumed by the lamp is V n i n / 2 (P2).
- the control oscillator 3 (FIG. 1) is chosen so as to allow adjustment of the amplitude of the control sinusoid Vcom. Since the voltage of the lamp 2 increases as a function of Vc 2 both at no load and under load and the open voltage having to be notably greater than the nominal output voltage, this oscillator 3 is advantageously controlled by a servo-control of the current of the lamp 2.
- Such a control system has been illustrated diagrammatically in FIG. 5.
- the current i2 of the lamp 2 is detected by a sensor 9, the output signal of which is subtracted from a reference voltage Vr, to control a corrector 10 whose output delivers the voltage Vc 2 to oscillator 3 delivering the control voltage Vcom.
- the corrector 10 is for example a PI type regulator (proportional-integrator).
- the 1/2 limit for performance may encourage the use of other classes amplifiers and for example an amplifier of the type of the amplifier 14 of the one which is represented on the figure 6.
- This amplifier 14 comprises in particular a transformer 10 whose secondary winding supplies the discharge lamp 2 which has two windings primary. By their common knot, these two windings primary are connected to a constant voltage source E, the other ends of these two windings being connected to the transistor collector 11 and 12.
- the node common to the two primary windings of the transformer 10 is connected by a resistor 15 to the collector of a transistor 13.
- the emitters of the transistors 11, 12, 13 are earthed via resistors referenced from 16 to 18.
- the base of transistor 11 is connected to the base of transistor 13 via a resistor 19 in series with a capacitor C1.
- the base of transistor 12 is connected to the collector of transistor 13 by a resistor 20 in series with a capacitor C2.
- a diode 21 Between the earth and the end of the resistor 20 opposite the base of transistor 12, is mounted a diode 21.
- a diode 22 is mounted between the earth and the end resistance 19 opposite the base of transistor 11.
- An oscillating voltage is supplied by a oscillator of the type of oscillator 3 based on the transistor 13.
- the asymptotic efficiency of this converter is about 78% ( ⁇ / 4).
- starting the lamp 2 can be done other than by using amplifier / converter as generator of pulses.
- FIG. 7 shows an amplifier Class A 24 implementing this solution.
- This amplifier comprises a transistor 25, the collector is connected to the primary winding of a transformer 26 and whose transmitter is connected to a resistor 27.
- the oscillating control voltage is supplied between the other end of resistor 27 and the base of transistor 25.
- the supply voltage E is supplied between resistor 27 and primary winding of transformer 26.
- Va is the starting voltage of the discharge and Vn and in the nominal voltage and current of the lamp.
- FIG. 8 A variant has been illustrated in FIG. 8. electromechanical switch to overcome these disadvantages.
- the lamp 2 is connected, on the one hand, to a amplifier 34 and, on the other hand, to a node N on which an inductor B is connected to earth by its other end, as well as the upper voltage terminal of a battery 31.
- the other end of the battery 11 is To the earth.
- a Reed relay 32 controlled by a circuit 33.
- Inductance B is a thin wire coil on a unclosed magnetic circuit (stick for example), this which allows to obtain a high inductance value in a reasonable volume with a high saturation current.
- the winding resistor of B is used to limit the current when relay 32 is closed. This relay has been modified to hold 2 kV (for example by filling the bulb with a gas, at a suitable pressure).
- the winding resistance of B is not bothersome after priming, due to low nominal currents of the lamps considered (10 mA for the lamp mentioned above).
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Description
- la figure 1 représente schématiquement de façon générale un dispositif d'alimentation conforme à l'invention ;
- la figure 2 représente schématiquement un circuit amplificateur linéaire pour la réalisation d'un dispositif d'alimentation conforme à une variante possible de l'invention ;
- la figure 3 illustre les courbes de tension et d'intensité dans l'enroulement primaire du transformateur de l'amplificateur de la figure 2, avant l'allumage de la lampe ;
- la figure 4 est un graphe sur lequel on a porté la valeur absolue de la valeur de la crête de tension d'amorçage ramenée à la tension E d'alimentation, en fonction de l'amplitude de la tension de l'oscillateur, pour un amplificateur du type de celui représenté sur la figure 2 ;
- la figure 5 illustre un asservissement possible de l'oscillateur alimentant l'amplificateur de la figure 2 ;
- la figure 6 représente le schéma d'un circuit amplificateur pour la réalisation d'un dispositif d'alimentation conforme à l'invention ;
- la figure 7 représente schématiquement un circuit amplificateur pour la réalisation d'un dispositif d'alimentation conforme à une autre variante de l'invention ;
- la figure 8 représente schématiquement un dispositif d'alimentation conforme à une autre variante encore de l'invention.
- si ωt1 ≤ 3π / 2, V1 = Lµω / RVc2 (=V)
- si ωt1 ≥ 3π / 2,= V1 = V sin ωt1
Nishimura et al Journal of the Illuminating Engineering Society, Summer 88.
Claims (9)
- Dispositif pour l'alimentation d'une lampe à décharge (2), caractérisé en ce qu'il comporte, d'une part, un oscillateur (3) délivrant un signal (Vcom) qui est sinusoïdal ou qui présente peu d'harmoniques significatives et est dépourvu de fronts raides, et, d'autre part, un amplificateur (4, 14, 24, 34) recevant en entrée le signal (Vcom) de l'oscillateur (3) et alimentant en sortie la lampe à décharge (2), le fonctionnement de cet amplificateur (4, 14, 24, 34) étant linéaire lorsque la lampe (2) est allumée.
- Dispositif selon la revendication 1, caractérisé en ce que lorsque la lampe (2) n'est pas allumée, l'amplificateur (4) fonctionne selon un régime transitoire non linéaire, où il génère des impulsions de tension (<FAX>-figure3) pour l'amorçage de la lampe à décharge (2).
- Dispositif selon la revendication 2, caractérisé en ce que l'amplificateur (4) comporte un transistor (5), dont le collecteur est relié à l'enroulement primaire (6a) d'un transformateur de tension (6), et dont l'émetteur est relié à une résistance (7), l'oscillateur délivrant une tension de sortie (Vcom) entre la base du transistor (5) et l'autre extrémité de la résistance (7), une source de tension constante (E) étant montée entre cette extrémité de la résistance (7) et l'autre extrémité de l'enroulement primaire (6a), l'enroulement secondaire (6b) du transformateur (6) alimentant la lampe à décharge (2).
- Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce qu'il comporte des moyens (9, 10) pour asservir l'amplitude de la tension en sortie (Vcom) de l'oscillateur au courant de la lampe (2).
- Dispositif selon la revendication 1, caractérisé en ce que l'amplificateur (24) présente un gain suffisament élevé pour fournir à la lampe (2) une tension d'amorçage.
- Dispositif selon la revendication 1, caractérisé en ce qu'un générateur d'impulsions (31, 32, 33) est monté en série avec la lampe (2).
- Dispositif selon la revendication 6, caractérisé en ce que le générateur d'impulsions comprend une source de tension d'amorçage (31) et un relais électromécanique (32,33) monté entre cette source (31) et la lampe (2).
- Dispositif selon l'une des revendications précédentes pour l'alimentation d'une lampe à décharge servant à l'éclairage intérieur d'un véhicule, notamment automobile.
- Dispositif selon l'une des revendications 1 à 7 pour l'alimentation d'une lampe à décharge servant à la signalisation d'un véhicule, notamment automobile.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9405602 | 1994-05-06 | ||
FR9405602A FR2719734B1 (fr) | 1994-05-06 | 1994-05-06 | Dispositif d'alimentation de lampe à décharge, notamment pour l'éclairage intérieur ou la signalisation de véhicule. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0681415A1 EP0681415A1 (fr) | 1995-11-08 |
EP0681415B1 true EP0681415B1 (fr) | 1998-07-22 |
Family
ID=9462968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950401028 Expired - Lifetime EP0681415B1 (fr) | 1994-05-06 | 1995-05-04 | Dispositif d'alimentation de lampe à décharge, notamment pour l'éclairage intérieur ou la signalisation de véhicule |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0681415B1 (fr) |
DE (1) | DE69503563T2 (fr) |
FR (1) | FR2719734B1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2909377A1 (de) * | 1979-03-09 | 1980-09-18 | Siemens Ag | Verfahren und schaltungsanordnung zur gleichzeitigen ansteuerung von mehreren gasentladungslampen mit edelgasfuellung |
GB8508913D0 (en) * | 1985-04-04 | 1985-05-09 | Lee C T | Electronic ballast |
JPH0185894U (fr) * | 1987-11-27 | 1989-06-07 | ||
FR2668020B1 (fr) * | 1990-10-12 | 1992-11-27 | Valeo Vision | Circuit d'alimentation pour une charge electrique comme une lampe a decharge, notamment pour projecteur de vehicule et projecteur de vehicule utilisant un tel circuit. |
-
1994
- 1994-05-06 FR FR9405602A patent/FR2719734B1/fr not_active Expired - Fee Related
-
1995
- 1995-05-04 EP EP19950401028 patent/EP0681415B1/fr not_active Expired - Lifetime
- 1995-05-04 DE DE1995603563 patent/DE69503563T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69503563D1 (de) | 1998-08-27 |
DE69503563T2 (de) | 1999-02-04 |
FR2719734B1 (fr) | 1996-07-26 |
EP0681415A1 (fr) | 1995-11-08 |
FR2719734A1 (fr) | 1995-11-10 |
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