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WO2000065880A1 - Source lumineuse constituee de plusieurs diodes electroluminescentes montees les unes derriere les autres - Google Patents

Source lumineuse constituee de plusieurs diodes electroluminescentes montees les unes derriere les autres Download PDF

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Publication number
WO2000065880A1
WO2000065880A1 PCT/EP2000/003624 EP0003624W WO0065880A1 WO 2000065880 A1 WO2000065880 A1 WO 2000065880A1 EP 0003624 W EP0003624 W EP 0003624W WO 0065880 A1 WO0065880 A1 WO 0065880A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
light source
current
voltage
source according
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.)
Ceased
Application number
PCT/EP2000/003624
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German (de)
English (en)
Inventor
Roland Reiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU49134/00A priority Critical patent/AU4913400A/en
Publication of WO2000065880A1 publication Critical patent/WO2000065880A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to a light source, comprising a plurality of LEDs connected in series, which are connected in series with a series resistor.
  • LEDs - light-emitting diodes - have a very high degree of efficiency when it comes to converting electricity into light. This efficiency is particularly high for LEDs for green light. But also so-called “white light LEDs” have one in particular in relation to
  • Incandescent lamps very good efficiency. The high level of efficiency and their long service life and thus high reliability make them particularly suitable for certain applications. Such applications typically include lighting of display boards, night lighting, for example in hotels or hospitals, emergency lighting and similar lighting installations in which a bundled, powerful light beam is not essential in the first place.
  • a circuit of this type consisting of a plurality of LEDs connected in series with a series resistor is common, especially if a higher light intensity is intended. Another advantage of connecting the LEDs in series is that this results in a higher voltage drop across the light source.
  • an LED has an "operating voltage" of approximately 2V. If, for example, 20 LEDs are operated in the series connection, a sufficient light intensity is achieved for typical applications, so this arrangement requires an operating voltage in the order of 40V. This value differs significantly from the normally available mains voltage of 230V or 110V, so that the voltage for LED operation must either be transformed down using a transformer or via a
  • the favorable efficiency of the LED for the conversion from current to light is understandably affected by the operational losses in the series resistor and possibly during the transformation, which affects the
  • the invention is therefore based on the object of providing a light source comprising a plurality of LEDs connected in series which can be operated at the voltage of the public network and in which excessive power losses in the series resistor are avoided.
  • Power network is connected, has;
  • DE-A-35 35 240 describes a traffic signal device with a light source comprising a plurality of LEDs which are fed in the frequency range from approximately 15 to 35 Hz. This low repetition rate is used to catch the eye's attention by flashing or flickering visibly
  • the possible energy saving effect will be illustrated in the following using a simple example.
  • the case of constant operation is compared with operation with current pulses:
  • the example is based on the mains voltage of 110V, which in the rectified state supplies an almost constant current with a voltage of the order of 150V. 20 LEDs should be considered in series at this voltage. In both cases, a total power of 1.5 W is assumed.
  • the pulse generator of the light source is preferably designed such that the pulse duty factor (pulse duration / period) of the current applied to the LEDs is less than 1/3, preferably less than 10 '1 , more preferably less than 10 2 and even more preferably less than 10 "3 Overall, it can be said that the smallest possible duty cycle is particularly preferred. However, in order to achieve sufficient brightness, a very high current must be brought into the LEDs in a short time with a very short duty cycle. In practice, problems can arise with a very small duty cycle occur.
  • the pulse generator is preferably designed such that the repetition frequency is greater than 130 Hz, preferably greater than 400 Hz, more preferably greater than 1 kHz and particularly preferably greater than
  • the pulse generator is preferably designed so that the pulse duration is less than or equal to 10 "3 seconds, preferably less than 10 ⁇ 5 seconds and particularly preferably less than 10 ⁇ 6 seconds.
  • the length of the pulse pauses can preferably be varied with the pulse length kept constant and the current constant. This enables the light source to be “dimmed”. The longer the pause between the individual current pulses, the lower the power introduced into the LEDs and consequently the output from the LEDs
  • Light output the lower. It is easy to imagine that an infinitely long pause corresponds to the switched-off state. It is particularly advantageous to go into a high frequency range for the operation of the light source if a large dimmable range is to be covered, in particular in order to avoid flickering of the light from the light source.
  • the arrangement is preferably constructed in such a way that the current applied is greater than that permissible in constant operation by more than a factor of 2, preferably by more than a factor of 5, more preferably by more than a factor of 10 and very particularly preferably by a factor of 20 Is maximum current.
  • the current-voltage characteristic of the LED specifies a certain "operating voltage" for each current value.
  • a typical current-voltage characteristic for LEDs follows an exponential behavior. In principle, the greater the current, the greater the operating voltage. With constant operation, the current strength in the LED cannot be increased arbitrarily. This would ultimately lead to the destruction of the LED. With pulsed operation, the current intensity in the LED can be increased considerably compared to constant operation.
  • the dimensioning rule is to choose the pulses so short that the LED does not heat up significantly in the pulse duration and in particular that the heat dissipation away from the LED is so high that there is no temperature increase in the LED from period to period.
  • the Cables to the LEDs are the factor that limits the maximum pulse current.
  • the LED chips are typically bonded with extremely thin gold or silver wires or electrically connected. If there is a current overload, a failure often occurs in the area of this connection.
  • the type-specific performance data provide information about this type-dependent limit. It can generally be assumed that the "operating voltage" of an LED can be increased by a factor of 2 to 3 up to this value, ie from typically 2V to up to 5-6V.
  • the pulse generator and the fast electronic are preferred.
  • the series resistor in particular can be chosen to be particularly small, which significantly reduces the power dissipated at the series resistor.
  • the pulse generator is preferably constructed with an electronic circuit which has:
  • Such a structure can essentially be realized from standard components. With the preferred additional use of a MOSFET component as a fast electronic switch, such a ballast for the LEDs can be implemented relatively cheaply. In addition, there is the possibility of further integration of the corresponding circuit into an integrated circuit. The corresponding ballast can be manufactured with the appropriate number of items at extremely favorable conditions.
  • the electronic circuit of the pulse generator is preferably connected to the rectifier circuit in parallel with the circuit of the LEDs.
  • Rectifier circuit can be, for example, a one-way rectifier circuit or also a bridge rectifier circuit, wherein it is preferably equipped with a smoothing capacitor in order to provide an essentially constant current.
  • the parallel connection of the electronic circuit of the pulse generator to the circuit of the LED is therefore particularly advantageous in that no additional network components are required for the circuit and the structure is significantly simplified.
  • other connection options can also be provided.
  • a plurality of LEDs, a fast electronic switch and a series resistor, and in particular without the rectifier circuit for connection to the voltage of the utility grid and without the series resistor being substantially smaller than it is for operation constant current would be required for independent inventive is considered.
  • the series resistor is preferably provided between the fast electronic switch and the base potential of the circuit, while the LEDs are provided between the fast electronic switch and the high potential, and even more preferably a voltage limiting diode is provided to limit the drive voltage of the fast electronic switch, thereby limiting the current is caused by the LEDs.
  • At least some of the plurality are LEDs
  • White light LEDs White light is particularly preferred for lighting purposes, in particular as night lighting.
  • the white light LEDs can either be LEDs in which a plurality of LEDs with different colors are arranged on one chip in one plane. There are typically four
  • LEDs - one red, one green and two blue - are spatially very closely arranged. These LEDs are also typically operated in series. The eye perceives the light of these LEDs in an additive mixture as white light.
  • White light LEDs which are blue LEDs coated with phosphorus, have also recently become available. The blue radiation of the LEDs excites the electrons in the phosphor to higher energy levels and generates the white light when it returns to the basic state.
  • the invention further relates to a traffic signal system having at least one light source of the type described above.
  • a traffic signal system having at least one light source of the type described above.
  • LED light sources is particularly favorable.
  • An important cost factor in traffic signal systems is the relatively frequent replacement of the usual lamps.
  • the replacement intervals can be extended by a factor of 2 or more, which leads to a more than halving of the usual maintenance costs.
  • the lower energy consumption of the LEDs is clearly noticeable in the running operating costs.
  • the use of Color-matching light sources for example red, yellow and green light sources in traffic lights, the energy efficiency can be further improved.
  • the loss of light in the corresponding color filters filter for green light, filter for red light, filter for yellow light
  • the loss of light in the corresponding color filters is extremely low. It is beneficial for two reasons
  • the filters can serve to drastically reduce stray light, for example due to solar radiation. This applies in particular if the filters in their passband are adapted to the very narrow frequency band of the LEDs.
  • the use of the light source with conventional mounting bases is particularly preferred.
  • the described dimming effect can be used to advantage here. It is even conceivable to record the intensity at the moment depending on the actual lighting situation, for example with a photocell, and that at the moment Adjust the required light intensity of the signal system based on this information, for example automatically. Even during the day, such a control rarely requires the signal system to operate at the highest intensity of the light source. This enables even greater energy savings to be achieved.
  • Fig. 1 shows schematically the structure of a light source according to the invention
  • Fig. 4 is a schematic circuit diagram of a possible embodiment of the light source according to the invention.
  • FIG. 1 shows a light source according to the invention having a
  • a rectifier circuit 8 is provided as the current source, which is designed for direct connection to the voltage of the public power grid, ie typically 230V or 110V AC voltage.
  • the rectifier circuit can be, for example, a one-way rectifier circuit or a bridge circuit in which, for example, a capacitor is provided for smoothing the rectified AC voltage.
  • the rectifier circuit provides a voltage of the order of 150V for the circuit of the LEDs when connected to an IOOV power supply network, while when operating on the 230V power supply system the circuit has an essentially constant voltage in the Magnitude of 320V is provided.
  • the fast electronic switch 6 is connected to a pulse generator 10.
  • the pulse generator 10 supplies the fast electronic switch 6 with control signals for opening and closing the circuit.
  • the control signals determine the length of the pulse duration, determine the
  • the amount of current through the LEDs 2 is primarily dependent on the total resistance in the circuit of the LEDs, i. H. determined in particular by the size of the series resistor 4.
  • the fast electronic switch 6 itself can be, for example, a transistor and in particular a MOSFET transistor.
  • N-channel MOSFETs have proven to be particularly suitable because, on the one hand, they are cheaper and, on the other hand, they switch faster than a p-
  • the fast electronic switch 6 should have only a very low resistance in the conductive state. It should also have particularly short switch-on and switch-off times in order to enable a particularly steep rise and fall of the current pulses.
  • LEDs 2 The special type and number of LEDs 2 is selected depending on the intended use. LEDs are supplied in a wide variety of colors and with a wide variety of operating data. There are so-called “white light LEDs", which are white
  • white light LEDs were made up of a plurality of LEDs of different colors, for example one green, one red and two blue LEDs, which are in one plane were spatially very close to each other.
  • the additive color mixing gave the viewer the impression of blue light.
  • white light LEDs are based on a blue LED on their
  • Light emission side has a phosphor coating.
  • the light from the blue LED stimulates the electrons in the phosphorus atoms to higher energy levels.
  • white light is emitted by the phosphorus atoms. This is done with such a high efficiency that an improvement in efficiency by up to a factor of 2 compared to conventional fluorescent lamps can be achieved with a light source according to the invention which works with such white light LEDs.
  • Even with the previously used ad d it i v e n W e i ß l i t- L E D s l a s s e n s I achieve efficiency improvements of this magnitude.
  • the diodes of the same color 2r, 2g, 2b (for red, green and blue) of the individual LEDs are connected in series in the manner shown in FIG. 2 and one is formed essentially separate circuit for each color in these LEDs, i.e. H.
  • a separate fast electronic switch 6r, 6g, 6b and a separate pulse generator lOr, 10g, 10b in principle any desired color can be generated by varying the brightness of the individual colors in the LEDs through the additive color mixing.
  • the upper rail 12 is at the high potential, while the lower rail 14 is at the reference potential, for example ground.
  • 1 and 2 is the Series resistor 4 between the fast electronic switch 6 and the base potential 14 shown. However, it can equally well be provided between the fast electronic switch 6 and the high potential 12.
  • FIG. 3 shows the current pulses as they are applied to the LEDs 2 by the needle pulse generator 10 in connection with the fast electronic switch 6.
  • the constant level of the pulses which corresponds to a constant pulse current I, can be seen.
  • the pulse duration is indicated with ⁇ .
  • the period, i.e. H. for example, the duration from the beginning of a pulse to the beginning of the following pulse is indicated by T.
  • the repetition frequency is thus determined as 1 / T.
  • Time between two pulses, ie the pulse pause is given as T P.
  • the current I ⁇ is also specified as the maximum current with which the LEDs can be operated at most in constant operation.
  • the size relationships shown in FIG. 3 correspond approximately to the size relationships on which the comparative calculation is based in the introduction to the description.
  • Fig. 4 shows schematically a circuit diagram of a possible
  • FIG. 4 essentially corresponds to FIG. 1 in its construction.
  • the pulse generator 10 is shown with a broken line for limitation in the circuit. It can be seen in particular that the pulse generator 10 is connected to the high potential 12 or the reference potential 14 of the circuit of the LEDs 2.
  • the pulse generator 10 is discussed in more detail below.
  • the essential components of this circuit are the capacitor Cl, which can be charged by a constant current source, a voltage divider formed with the two resistors R13 and R14 for generating a reference voltage U R , a uni-function transistor UJT connected to the reference voltage U R and the capacitor voltage U c , which ignites as soon as the capacitor voltage U c becomes somewhat lower than the reference voltage U R , and a switch S1 connected to the unijunction transistor UJT and the capacitor Cl, which is switched on by the ignition of the unijunction transistor UJT for the duration of a pulse.
  • the constant current source for charging the capacitor C1 consists of the transistor T1, the resistors R1 and R2 and the diodes D20 and D21.
  • Unijunction transistor UJT is formed from two transistors T3 and T5.
  • the switch S1 is formed by the transistor T4 and the resistors R9 and RIO. It should be particularly pointed out that in particular the constant current source and the switch S1 can also be constructed completely differently. For example, there are IC circuits that can serve as a replacement for the structure of the switch S1 shown. Similar circuits can also be used as a constant current source for the capacitor C1. Other implementation options can also be imagined for the uni-function transistor UJT. Other components of the circuit shown are also not absolutely necessary.
  • the transistor T6 essentially serves as an amplification transistor for the control pulses to be delivered to the fast electronic switch 6. This can depend on the special choice of the fast electronic switch 6 or on the
  • a buffer capacitor C2 is shown in the circuit, for example, which is provided for stabilizing the circuit but is not absolutely necessary.
  • Resistor R11 is also not absolutely necessary, it essentially facilitates the selection and tuning of resistors R13 and R14.
  • a voltage limiter diode D30 is also provided in the circuit, the purpose of which is to limit the drive voltage at the fast electronic switch 6. This component too, although advantageous, is not absolutely necessary.
  • the capacitor Cl is charged by the constant current source, the capacitor voltage U c at the lower end of the capacitor Cl gradually falling within a predetermined time interval until the capacitor voltage U c is slightly less than that of the resistors R13 and R14 formed voltage divider generated reference voltage U R.
  • the uni-function transistor UJT begins to conduct.
  • the capacitor C1 is discharged via the uni-function transistor UJT and the resistors R9 and RIO. As long as current flows between the resistors R9 and RIO, the transistor T4 and the
  • Resistors R7, R8 of transistor T2 are turned on.
  • transistor T2 By switching transistor T2 on, transistor T1 is switched off, ie the constant current source is switched off and the charging current to capacitor C1 is interrupted.
  • the control pulse is emitted by the pulse generator 10, ie applied to the fast electronic switch.
  • the transistors T4, T2 and T6 turn off and by turning off the transistor T2 the transistor T1 is turned on again, ie the constant current source starts to charge the capacitor C1 again and the process begins again.
  • the discharge speed of the capacitor C1 and thus the pulse length can be varied over the total resistance of R9 and RIO.
  • the size of the charging current of the constant current source for the capacitor Cl and thus the pulse pause can be regulated by changing the size of the resistor R1.
  • a change in the capacitance of the capacitor C1 primarily results in a change in only the frequency with the same ratio of pulse length to period, i. H. with the same
  • the mechanism is as follows: When the current through the LEDs 2 increases, the voltage that drops across the series resistor 4 increases, which reduces the effective voltage between the gate G and the source S of the fast electronic switch 6 provided as a MOSFET. This voltage reduction reduces the conductivity of the MOSFET, ie increases its resistance and thus limits the current through the

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

Abstract

L'invention concerne une source lumineuse comportant une pluralité de diodes électroluminescentes (2) qui sont montées en série avec une résistance préliminaire (4). Cette source lumineuse se caractérise en ce que: (a) le circuit de courant des diodes électroluminescentes (2) présente, en plus de la résistance préliminaire (4), un commutateur électronique (6) rapide et, comme source de courant, un circuit redresseur (8) qui, pendant le fonctionnement, est raccordé à la tension du réseau public; (b) le commutateur électronique (6) rapide est raccordé à un générateur d'impulsions (10) qui délivre des impulsions à une fréquence d'au moins 70 Hz; (c) la résistance préliminaire (4) est plus petite qu'une résistance préliminaire utilisée pour le fonctionnement avec un courant constant; (d) et l'agencement est tel que l'amplitude de courant au niveau des diodes électroluminescentes (2) est plus grande que celle du courant maximal admissible pour le fonctionnement avec courant constant.
PCT/EP2000/003624 1999-04-22 2000-04-20 Source lumineuse constituee de plusieurs diodes electroluminescentes montees les unes derriere les autres Ceased WO2000065880A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49134/00A AU4913400A (en) 1999-04-22 2000-04-20 Light source consisting of several successively connected leds

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19918336.8 1999-04-22
DE19918336A DE19918336A1 (de) 1999-04-22 1999-04-22 Lichtquelle aus mehreren hintereinandergeschalteten LEDs

Publications (1)

Publication Number Publication Date
WO2000065880A1 true WO2000065880A1 (fr) 2000-11-02

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ID=7905533

Family Applications (1)

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PCT/EP2000/003624 Ceased WO2000065880A1 (fr) 1999-04-22 2000-04-20 Source lumineuse constituee de plusieurs diodes electroluminescentes montees les unes derriere les autres

Country Status (3)

Country Link
AU (1) AU4913400A (fr)
DE (1) DE19918336A1 (fr)
WO (1) WO2000065880A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1521235A3 (fr) * 2003-10-03 2005-06-08 LumiLeds Lighting U.S., LLC Rétroéclairage pour un affichage à cristaux liquides comprenant un réseau bidimensionnel de diodes électroluminescentes
IT202000023632A1 (it) 2020-10-07 2022-04-07 Zaglio S R L Unità e metodo di alimentazione per dispositivi di illuminazione a led

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933733B4 (de) * 1999-07-19 2010-10-21 Volkswagen Ag PWM-Ansteuerverfahren
IL134337A0 (en) * 2000-02-02 2001-04-30 Krainer Pini A method for reducing energy consumption of led illuminated road marker and a high efficiency road marker using same
DE10140331C2 (de) * 2001-08-16 2003-11-06 Siemens Ag Lichtzeichen zur Verkehrssteuerung und Verfahren zur Funktionsüberwachung eines solchen Zeichens
FR2831382B1 (fr) * 2001-10-19 2008-12-26 Valeo Vision Dispositif d'eclairage ou de signalisation a diodes electroluminescentes
DE102007026867A1 (de) * 2007-03-28 2008-10-02 Glp German Light Products Gmbh Leuchte und Verfahren zum Betreiben einer Leuchte
DE102009000289A1 (de) 2008-02-08 2009-08-20 Volkswagen Ag Beleuchtungsanordnung mit geregelter Lichtintensität und Verfahren zum Regeln der Lichtintensität
DE102010008876B4 (de) 2010-02-22 2017-07-27 Integrated Micro-Electronics Bulgaria Lichtquelle mit Array-LEDs zum direkten Betrieb am Wechselspannungsnetz und Herstellungsverfahren hierfür
FR2998035A1 (fr) * 2013-05-07 2014-05-16 Continental Automotive France Dispositif d'eclairage pour vehicule automobile

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FR2714564A1 (fr) * 1993-12-28 1995-06-30 Etat Francais Labo Cl Ponts Ch Procédé de commande d'une source lumineuse, moyens pour la mise en Óoeuvre de ce procédé et dispositif équipé des dits moyens.
EP0674468A2 (fr) * 1994-03-24 1995-09-27 SYNTON GmbH FORSCHUNG-ENTWICKLUNG-VERTRIEB Appareil de soins à lumière colorée
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DE29718360U1 (de) * 1997-10-06 1998-01-08 Siemens AG, 80333 München Einrichtung zur Erzeugung der Nachtzeichen von Formsignalen
EP0876085A2 (fr) * 1997-04-24 1998-11-04 Incerti & Simonini di Incerti Edda & C. S.n.c. Dispositif d'éclairage pour basses tensions
GB2337645A (en) * 1998-05-21 1999-11-24 Avimo Ltd Warning light with overdriven LEDs

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GB1574387A (en) * 1976-01-28 1980-09-03 Bourboulon H Light signalling devices
GB1543722A (en) * 1976-06-11 1979-04-04 Ferranti Ltd Display device energisation circuits
FR2435882A1 (fr) * 1978-06-05 1980-04-04 Wilkins & Ass Dispositif d'emission de rayonnement
DE3535204A1 (de) 1984-10-04 1986-04-17 Nyström, Karl Gösta, Umeå Verkehrssignaleinrichtung oder andere aehnliche lichtsignaleinrichtung
US5017833A (en) * 1988-04-13 1991-05-21 Square D Company Pilot light assembly
WO1991006078A1 (fr) * 1989-10-11 1991-05-02 Choi Robert S Lampe d'avertissement de securite a diode superelectroluminescente clignotante alimentee par pile
FR2711884A1 (fr) * 1993-10-29 1995-05-05 Solartec Sarl Dispositif de signalisation notamment pour la signalisation routière, aéronautique ou maritime.
FR2714564A1 (fr) * 1993-12-28 1995-06-30 Etat Francais Labo Cl Ponts Ch Procédé de commande d'une source lumineuse, moyens pour la mise en Óoeuvre de ce procédé et dispositif équipé des dits moyens.
EP0674468A2 (fr) * 1994-03-24 1995-09-27 SYNTON GmbH FORSCHUNG-ENTWICKLUNG-VERTRIEB Appareil de soins à lumière colorée
US5661645A (en) * 1996-06-27 1997-08-26 Hochstein; Peter A. Power supply for light emitting diode array
EP0876085A2 (fr) * 1997-04-24 1998-11-04 Incerti & Simonini di Incerti Edda & C. S.n.c. Dispositif d'éclairage pour basses tensions
DE29718360U1 (de) * 1997-10-06 1998-01-08 Siemens AG, 80333 München Einrichtung zur Erzeugung der Nachtzeichen von Formsignalen
GB2337645A (en) * 1998-05-21 1999-11-24 Avimo Ltd Warning light with overdriven LEDs

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1521235A3 (fr) * 2003-10-03 2005-06-08 LumiLeds Lighting U.S., LLC Rétroéclairage pour un affichage à cristaux liquides comprenant un réseau bidimensionnel de diodes électroluminescentes
US7052152B2 (en) 2003-10-03 2006-05-30 Philips Lumileds Lighting Company, Llc LCD backlight using two-dimensional array LEDs
IT202000023632A1 (it) 2020-10-07 2022-04-07 Zaglio S R L Unità e metodo di alimentazione per dispositivi di illuminazione a led

Also Published As

Publication number Publication date
DE19918336A1 (de) 2000-11-02
AU4913400A (en) 2000-11-10

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