FR2711884A1 - Signalling device, in particular for road, aeronautical or maritime signalling - Google Patents

Signalling device, in particular for road, aeronautical or maritime signalling Download PDF

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Publication number
FR2711884A1
FR2711884A1 FR9312944A FR9312944A FR2711884A1 FR 2711884 A1 FR2711884 A1 FR 2711884A1 FR 9312944 A FR9312944 A FR 9312944A FR 9312944 A FR9312944 A FR 9312944A FR 2711884 A1 FR2711884 A1 FR 2711884A1
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Prior art keywords
aeronautical
road
maritime
signaling
intensity
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FR9312944A
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FR2711884B1 (en
Inventor
Hanique Jean-Pierre
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SOLARTEC SARL
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SOLARTEC SARL
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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/327—Burst dimming
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The present invention relates to a signalling device, in particular for road, aeronautical or maritime signalling, of the type including a plurality of light-emitting diodes, characterised in that the said light-emitting diodes (1) are supplied with cyclic signals, the supply voltage corresponding to the nominal voltage, the intensity of the said supply signals being variable between 0 and an intensity Imax greater than the maximum rated intensity, the pulse duration being less than 100 milliseconds.

Description

DISPOSITIF DE SIGNALISATION NOTAMMENT
POUR LA SIGNALISATION ROUTIERE, AERONAUTIQUE OU
MARITIME.SIGNALING DEVICE, ESPECIALLY
FOR ROAD, AERONAUTICAL OR SIGNALING
MARITIME.

La présente invention concerne un dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime. On connaît dans l'état de la technique plusieurs types de dispositifs de signalisation. The present invention relates to a signaling device in particular for road, aeronautical or maritime signaling. Several types of signaling devices are known in the state of the art.

Un premier type de dispositifs est constitué par des feux permanents mettant en oeuvre des lampes à incandescence. De telles lampes présentent une consommation électrique élevée, une durée de vie moyenne d'environ une année, et de nombreux défauts de jeunesse se révélant au cours des premiers mois. A first type of device consists of permanent lights using incandescent lamps. Such lamps have a high electrical consumption, an average lifespan of about a year, and many defects of youth revealing themselves during the first months.

Un deuxième type de dispositifs met en oeuvre des tubes fluorescents, nécessitant de fortes tensions alternatives et en conséquence un système d'alimentation relativement coûteux. A second type of device uses fluorescent tubes, requiring high alternating voltages and consequently a relatively expensive supply system.

Une troisième type de dispositifs met en oeuvre des lampes à décharge dans un gaz rare, par exemple du Xénon. De telles lampes nécessitent également des systèmes d'alimentation complexes et sont d'un prix de revient élevé. A third type of device uses discharge lamps in a rare gas, for example Xenon. Such lamps also require complex supply systems and are expensive.

Un autre type de dispositifs met en oeuvre des diodes électroluminescentes. Un exemple de réalisation est décrit dans le brevet français nO 2350034. La luminosité de tels dispositifs est toutefois limitée, et peut être insuffisante lorsque les conditions de visibilités sont faibles, par exemple par temps de brouillard. Another type of device uses light-emitting diodes. An exemplary embodiment is described in French patent No. 2350034. The brightness of such devices is however limited, and may be insufficient when the visibility conditions are low, for example in foggy weather.

L'objet de la présente invention est de remédier à ces différents inconvénients en proposant un dispositif de signalisation présentant une luminosité satisfaisante, et une consommation réduite, compatible par exemple avec une alimentation par cellules photovoltaïques et batterie tampon. The object of the present invention is to remedy these various drawbacks by proposing a signaling device having a satisfactory brightness and a reduced consumption, compatible for example with a supply by photovoltaic cells and buffer battery.

L'invention concerne plus particulièrement un dispositif de signalisation à éclat du type comportant une pluralité de diodes électroluminescentes, caractérisé en ce que lesdites diodes électroluminescentes sont alimentées par des signaux cycliques, la tension d'alimentation correspondant à la tension nominale, l'intensité desdits signaux d'alimentation étant variable entre 0 et une intensité Imax supérieure à l'intensité maximale nominale, la durée des impulsions étant inférieure ou égale à 100 millisecondes. La durée des impulsions est avantageusement comprise entre 20 et 60 millisecondes, en régime périodique avec un rapport cyclique compris entre 1/5 et 1/30. The invention relates more particularly to a flash signaling device of the type comprising a plurality of light-emitting diodes, characterized in that said light-emitting diodes are supplied by cyclic signals, the supply voltage corresponding to the nominal voltage, the intensity of said supply signals being variable between 0 and an intensity Imax greater than the nominal maximum intensity, the duration of the pulses being less than or equal to 100 milliseconds. The duration of the pulses is advantageously between 20 and 60 milliseconds, in periodic mode with a duty cycle of between 1/5 and 1/30.

Ce mode de réalisation va à l'encontre des préjugés de l'homme de Métier qui est enclin à respecter les spécifications du constructeur. il est toutefois apparu que la durée de vie d'une diode électroluminescente n'est pas réellement affectée lorsque le dépassement de l'intensité nominale Imax est inférieur à 100 millisecondes. This embodiment goes against the prejudices of the skilled person who is inclined to respect the manufacturer's specifications. however, it has become apparent that the lifetime of a light-emitting diode is not really affected when the exceeding of the nominal intensity Imax is less than 100 milliseconds.

Il présente par ailleurs divers avantages sur le plan optique, du fait de la colorimétrie des éclats adaptée à une visibilité par temps de brouillard et une faible dispersion. De façon générale, les éclats du dispositif selon l'invention sont peu éblouissants, et visibles dans de bonnes conditions quelque soient les circonstances climatiques. En outre, contrairement aux feux à éclats à lampe à décharge, les dispositifs selon l'invention ne provoquent pas de nuisances hertziennes, et ne perturbent donc pas les systèmes de transmission de signaux de contrôle ou de sécurité H.F. mis en oeuvre par des balises d'autoroute par exemple. La consommation électrique de tels dispositifs est environ 7 fois inférieure à un feu à éclat à lampe Xenon de même intensité lumineuse. It also has various advantages from an optical point of view, due to the colorimetry of the flakes adapted to visibility in foggy weather and low dispersion. In general, the flakes of the device according to the invention are not very dazzling, and visible under good conditions whatever the climatic circumstances. In addition, unlike flashing flashlights with discharge lamp, the devices according to the invention do not cause radio interference, and therefore do not disturb the HF control or safety signal transmission systems implemented by beacons. highway for example. The electrical consumption of such devices is approximately 7 times lower than a flashing lamp with Xenon lamp of the same light intensity.

De préférence, l'amplitude des signaux d'alimentation est supérieure à 3 fois l'intensité nominale en régime continu. Preferably, the amplitude of the supply signals is greater than 3 times the nominal intensity in continuous mode.

Avantageusement, la durée des impulsions est asservie par un capteur de luminosité. Advantageously, the duration of the pulses is controlled by a brightness sensor.

Selon une variante, les signaux d'alimentation varient de manière progressive par paliers entre 0 et l'intensité maximale Iman.  According to a variant, the supply signals vary progressively in stages between 0 and the maximum intensity Iman.

Selon un mode de réalisation préféré, la fréquence des signaux d'alimentation est comprise entre 1 et 3 hertz. Ce mode de fonctionnement n'entraîne pas de perte d'intensité lumineuse, contrairement aux dispositifs de l'art antérieur. According to a preferred embodiment, the frequency of the supply signals is between 1 and 3 hertz. This operating mode does not cause a loss of light intensity, unlike the devices of the prior art.

La présente invention sera mieux comprise à la lecture de la description qui suit, faisant référence aux dessins annexés relatifs à un exemple non limitatif de réalisation, où
- la figure 1 représente une vue de face d'un dispositif selon l'invention
- la figure 2 représente un exemple de signaux.The present invention will be better understood on reading the description which follows, referring to the appended drawings relating to a nonlimiting exemplary embodiment, where
- Figure 1 shows a front view of a device according to the invention
- Figure 2 shows an example of signals.

La figure 1 représente une vue de face d'un dispositif selon l'invention. il est constitué par une pluralité de diodes électroluminescentes (1) soudées sur une plaque (2) de circuit imprimé. FIG. 1 represents a front view of a device according to the invention. it consists of a plurality of light emitting diodes (1) welded to a printed circuit board (2).

Les diodes électroluminescentes sont réparties sur la plaque de circuit imprimé de façon régulière et uniforme, avec un entre-axe d'environ 5 millimètres. The light-emitting diodes are distributed on the printed circuit board in a regular and uniform manner, with a center distance of approximately 5 millimeters.

Le dispositif comporte par ailleurs une couronne (3) de diodes électroluminescentes (4) alimentées en continu, à l'intensité nominale, ou également fonctionnant en régime impulsionnel.  The device also comprises a ring (3) of light-emitting diodes (4) supplied continuously, at nominal current, or also operating in pulse mode.

Les diodes électroluminescentes sont par exemple branchées en série-parallèle, par groupe de 6. The light-emitting diodes are for example connected in series-parallel, in groups of 6.

La tension nominale est typiquement comprise entre 1,9 et 2,4 volts, ce qui permet d'alimenter les branches de six diodes électroluminescentes avec une tension de 12 volts.The nominal voltage is typically between 1.9 and 2.4 volts, which makes it possible to supply the branches of six light-emitting diodes with a voltage of 12 volts.

L'intensité maximale préconisée par le constructeur est par exemple de 20 milliampères. The maximum intensity recommended by the manufacturer is for example 20 milliamps.

Les diodes électroluminescentes sont alimentées dans l'exemple décrit par des signaux cycliques carrés à tension constante, d'une intensité maximale d'environ 60 milliampères, et d'une durée d'impulsion variable entre 10 et 60 millisecondes en fonctions des conditions de luminosité ambiante. Les impulsions sont espacées d'environ 300 millisecondes. Le rapport cyclique est donc de l'ordre de 1/30 à 1/5. The light-emitting diodes are supplied in the example described by square cyclic signals at constant voltage, with a maximum intensity of approximately 60 milliamps, and with a variable pulse duration between 10 and 60 milliseconds depending on the light conditions. ambient. The pulses are spaced about 300 milliseconds apart. The duty cycle is therefore of the order of 1/30 to 1/5.

La figure 2 représente un exemple de signaux d'alimentation, dans lequel l'intensité varie par palier de 20 milliampères, entre une valeur nulle et une valeur maximale de 60 milliampères, soit près de 3 fois l'intensité maximale préconisée par le constructeur. FIG. 2 represents an example of supply signals, in which the intensity varies in 20 milliampere increments, between a zero value and a maximum value of 60 milliamperes, or nearly 3 times the maximum intensity recommended by the manufacturer.

Les circuits d'alimentation et de commande comportent un module d'alimentation et un module de commande. The supply and control circuits include a supply module and a control module.

Le module d'alimentation comporte un transformateur délivrant un signal basse tension alternatif de 12 volts, redressé et régulé par un circuit redresseur. Le circuit d'alimentation comporte une batterie tampon permettant d'assurer la permanence du fonctionnement nonobstant d'éventuelles coupures de courant. The power supply module includes a transformer delivering an AC low voltage signal of 12 volts, rectified and regulated by a rectifier circuit. The power supply circuit includes a buffer battery to ensure continuous operation notwithstanding any power outages.

Le module de commande comporte un circuit d'horloge délivrant un signal de consigne. Ce signal d'horloge permet de générer les différents signaux cycliques nécessaires au fonctionnement du dispositif. The control module includes a clock circuit delivering a setpoint signal. This clock signal makes it possible to generate the various cyclic signals necessary for the operation of the device.

Chaque dispositif comporte en outre une entrée de signal d'horloge provenant d'un autre dispositif afin de permettre de synchroniser le fonctionnement de plusieurs dispositifs, ainsi qu'une sortie du signal d'horloge permettant d'asservir d'autres dispositifs.Each device also has a clock signal input from another device to allow synchronization of the operation of several devices, as well as a clock signal output for controlling other devices.

A titre d'exemple, le fonctionnement de plusieurs dispositifs peut être simultané ou alterné, ou encore en mode de "chenillard"
Le module de commande reçoit en outre un signal généré par un capteur de luminosité délivrant un signal d'asservissement de la durée des impulsions d'alimentation des diodes électroluminescentes.For example, the operation of several devices can be simultaneous or alternating, or even in "chase" mode.
The control module also receives a signal generated by a brightness sensor delivering a signal for controlling the duration of the supply pulses of the light-emitting diodes.

A titre d'exemple, la durée des impulsions varie entre 20 millisecondes la nuit et 70 millisecondes par temps de brouillard, avec une valeur intermédiaire de 40 millisecondes de jour. For example, the duration of the pulses varies between 20 milliseconds at night and 70 milliseconds in foggy weather, with an intermediate value of 40 milliseconds during the day.

Le circuit de commande comporte également un étage de puissance à circuit MOS. The control circuit also includes a MOS circuit power stage.

L'invention est décrite dans ce qui précède à titre d'exemple non limitatif. Il est bien entendu que l'Homme de Métier sera à même de réaliser différentes variantes sans pour autant sortir du cadre de l'invention.  The invention is described in the foregoing by way of nonlimiting example. It is understood that the skilled person will be able to produce different variants without departing from the scope of the invention.

Claims (8)

REVENDICATIONS 1 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime, du type comportant une pluralité de diodes électroluminescentes, caractérisé en ce que lesdites diodes électroluminescentes (1) sont alimentées par des signaux cycliques, la tension d'alimentation correspondant à la tension nominale, l'intensité desdits signaux d'alimentation étant variable entre 0 et une intensité Imax supérieure à l'intensité maximale préconisée, la durée des impulsions étant inférieure à 100 millisecondes. 1 - Signaling device in particular for road, aeronautical or maritime signaling, of the type comprising a plurality of light-emitting diodes, characterized in that said light-emitting diodes (1) are supplied by cyclic signals, the supply voltage corresponding to the voltage nominal, the intensity of said supply signals being variable between 0 and an intensity Imax greater than the maximum recommended intensity, the duration of the pulses being less than 100 milliseconds. 2 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime selon la revendication 1 caractérisé en ce que l'amplitude des signaux d'alimentation est supérieure à 3 fois l'intensité nominale en régime continu. 2 - Signaling device in particular for road, aeronautical or maritime signaling according to claim 1 characterized in that the amplitude of the supply signals is greater than 3 times the nominal current in continuous mode. 3 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime selon l'une quelconque des revendications précédentes caractérisé en ce que la durée des impulsions est asservie par un capteur de luminosité. 3 - Signaling device in particular for road, aeronautical or maritime signaling according to any one of the preceding claims, characterized in that the duration of the pulses is controlled by a brightness sensor. 4 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime selon l'une quelconque des revendications précédentes caractérisé en ce que les signaux d'alimentation varient de manière progressive par paliers entre 0 et l'intensité maximale 1maux  4 - Signaling device in particular for road, aeronautical or maritime signaling according to any one of the preceding claims, characterized in that the supply signals vary progressively in stages between 0 and the maximum intensity 1maux 5 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime selon l'une quelconque des revendications précédentes caractérisé en ce que la fréquence des signaux d'alimentation est comprise entre 1 et 3 hertz. 5 - Signaling device in particular for road, aeronautical or maritime signaling according to any one of the preceding claims, characterized in that the frequency of the supply signals is between 1 and 3 hertz. 6 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime selon l'une quelconque des revendications précédentes caractérisé en ce qu'il comporte un circuit d'horloge délivrant un signal de cadencement des signaux d'alimentation, le dispositif comportant une sortie du signal d'horloge pour la synchronisation de dispositifs esclaves. 6 - Signaling device in particular for road, aeronautical or maritime signaling according to any one of the preceding claims, characterized in that it comprises a clock circuit delivering a timing signal of the supply signals, the device comprising an output of the clock signal for synchronizing slave devices. 7 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime selon l'une quelconque des revendications précédentes caractérisé en ce que les diodes électroluminescentes sont alimentés par un signal périodique d'une intensité supérieure à 3 fois la valeur nominale, et dont le rapport cyclique est compris entre 1/5 et 1/30. 7 - Signaling device in particular for road, aeronautical or maritime signaling according to any one of the preceding claims, characterized in that the light-emitting diodes are supplied by a periodic signal of an intensity greater than 3 times the nominal value, and the duty cycle is between 1/5 and 1/30. 8 - Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime selon l'une quelconque des revendications précédentes caractérisé en ce que les diodes électroluminescentes sont disposés sur un support plan est sont organisées en un réseau de diodes dans lequel deux diodes adjacentes sont séparées par une distance d'environ 5 millimètres.  8 - Signaling device in particular for road, aeronautical or maritime signaling according to any one of the preceding claims, characterized in that the light-emitting diodes are arranged on a flat support and are organized in a network of diodes in which two adjacent diodes are separated by a distance of about 5 millimeters.
FR9312944A 1993-10-29 1993-10-29 Signaling device in particular for road, aeronautical or maritime signaling. Expired - Fee Related FR2711884B1 (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998049872A1 (en) * 1997-04-30 1998-11-05 Signal House Limited Traffic signals
WO1999059869A1 (en) * 1998-05-21 1999-11-25 Avimo Limited Warning light with light emitting diodes
EP1035754A2 (en) * 1999-03-06 2000-09-13 Mannesmann VDO Aktiengesellschaft Signalling device with a light emitting diode
WO2000054556A1 (en) * 1999-03-08 2000-09-14 Bebenroth Guenther Circuit arrangement for operating a luminous element
WO2000065880A1 (en) * 1999-04-22 2000-11-02 Sickinger, Monika Light source consisting of several successively connected leds
EP1071312A2 (en) * 1999-07-19 2001-01-24 Volkswagen Aktiengesellschaft PWM driving method
WO2001058219A1 (en) * 2000-02-02 2001-08-09 Pinhas Krainer A method for reducing energy consumption of led illuminated road marker and a high efficiency road marker using same
WO2001057997A1 (en) * 2000-01-31 2001-08-09 Bebenroth Guenther Circuit configuration for operating light-emitting diodes
WO2001080603A2 (en) * 2000-04-19 2001-10-25 Lighthouse Technologies Ltd. Method and apparatus to improve the colour rendering of a solid state light source
US6456205B1 (en) 1998-05-21 2002-09-24 Thales Optronics (Taunton) Ltd Anti-collision warning lights and method of use
EP1304907A1 (en) * 2001-10-19 2003-04-23 Valeo Vision Lighting or signalling device with Leds
DE19945546B4 (en) * 1999-09-23 2005-06-23 Reitter & Schefenacker Gmbh & Co. Kg Method for controlling lamps of vehicles, preferably of motor vehicles, and device for carrying out the method
DE102004060483A1 (en) * 2004-12-16 2006-06-29 Hella Kgaa Hueck & Co. Operating method e.g. for light flash warning device, having LED subjected to flash rate during pulse like switching from pulse-like current
FR2998035A1 (en) * 2013-05-07 2014-05-16 Continental Automotive France Lighting device for low definition display of car, has control circuit, where secondary impulse is received during interval of time having duration during which heat produced by on-impulse and by secondary impulse are evacuated by device
IT202000023632A1 (en) 2020-10-07 2022-04-07 Zaglio S R L UNIT AND METHOD OF POWER SUPPLY FOR LED LIGHTING DEVICES

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FR2340410A1 (en) * 1976-02-04 1977-09-02 Minnesota Mining & Mfg ROAD SIGNALING DEVICE
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998049872A1 (en) * 1997-04-30 1998-11-05 Signal House Limited Traffic signals
WO1999059869A1 (en) * 1998-05-21 1999-11-25 Avimo Limited Warning light with light emitting diodes
US6456205B1 (en) 1998-05-21 2002-09-24 Thales Optronics (Taunton) Ltd Anti-collision warning lights and method of use
EP1035754A3 (en) * 1999-03-06 2001-12-05 Mannesmann VDO Aktiengesellschaft Signalling device with a light emitting diode
EP1035754A2 (en) * 1999-03-06 2000-09-13 Mannesmann VDO Aktiengesellschaft Signalling device with a light emitting diode
WO2000054556A1 (en) * 1999-03-08 2000-09-14 Bebenroth Guenther Circuit arrangement for operating a luminous element
WO2000065880A1 (en) * 1999-04-22 2000-11-02 Sickinger, Monika Light source consisting of several successively connected leds
EP1071312A2 (en) * 1999-07-19 2001-01-24 Volkswagen Aktiengesellschaft PWM driving method
DE19933733B4 (en) * 1999-07-19 2010-10-21 Volkswagen Ag PWM driving
EP1071312A3 (en) * 1999-07-19 2001-08-16 Volkswagen Aktiengesellschaft PWM driving method
DE19945546B4 (en) * 1999-09-23 2005-06-23 Reitter & Schefenacker Gmbh & Co. Kg Method for controlling lamps of vehicles, preferably of motor vehicles, and device for carrying out the method
WO2001057997A1 (en) * 2000-01-31 2001-08-09 Bebenroth Guenther Circuit configuration for operating light-emitting diodes
WO2001058219A1 (en) * 2000-02-02 2001-08-09 Pinhas Krainer A method for reducing energy consumption of led illuminated road marker and a high efficiency road marker using same
WO2001080603A3 (en) * 2000-04-19 2002-02-28 Lighthouse Technologies Ltd Method and apparatus to improve the colour rendering of a solid state light source
WO2001080603A2 (en) * 2000-04-19 2001-10-25 Lighthouse Technologies Ltd. Method and apparatus to improve the colour rendering of a solid state light source
FR2831382A1 (en) * 2001-10-19 2003-04-25 Valeo Vision LIGHTING OR SIGNALING DEVICE WITH LIGHT EMITTING DIODES
EP1304907A1 (en) * 2001-10-19 2003-04-23 Valeo Vision Lighting or signalling device with Leds
DE102004060483A1 (en) * 2004-12-16 2006-06-29 Hella Kgaa Hueck & Co. Operating method e.g. for light flash warning device, having LED subjected to flash rate during pulse like switching from pulse-like current
DE102004060483B4 (en) 2004-12-16 2018-06-07 HELLA GmbH & Co. KGaA Method for operating a light flash warning device with at least one light emitting diode
FR2998035A1 (en) * 2013-05-07 2014-05-16 Continental Automotive France Lighting device for low definition display of car, has control circuit, where secondary impulse is received during interval of time having duration during which heat produced by on-impulse and by secondary impulse are evacuated by device
IT202000023632A1 (en) 2020-10-07 2022-04-07 Zaglio S R L UNIT AND METHOD OF POWER SUPPLY FOR LED LIGHTING DEVICES

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