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FR2891106A1 - LEDs supplying and connecting method for producing lamp e.g. automobile lamp, involves connecting LEDs in series and associating Zener diode in parallel on each LED, where diode presents Zener voltage value greater than LED voltage - Google Patents

LEDs supplying and connecting method for producing lamp e.g. automobile lamp, involves connecting LEDs in series and associating Zener diode in parallel on each LED, where diode presents Zener voltage value greater than LED voltage Download PDF

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Publication number
FR2891106A1
FR2891106A1 FR0509585A FR0509585A FR2891106A1 FR 2891106 A1 FR2891106 A1 FR 2891106A1 FR 0509585 A FR0509585 A FR 0509585A FR 0509585 A FR0509585 A FR 0509585A FR 2891106 A1 FR2891106 A1 FR 2891106A1
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FR
France
Prior art keywords
voltage
light
led
diode
emitting diodes
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
FR0509585A
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French (fr)
Inventor
Patrick Courteix
Alain Limpas
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to FR0509585A priority Critical patent/FR2891106A1/en
Publication of FR2891106A1 publication Critical patent/FR2891106A1/en
Pending 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
    • 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]

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

Abstract

The method involves connecting LEDs (7) in series and associating a Zener diode (8) in parallel on each LED. The diode presents a Zener voltage value larger than LED voltage supplied by a current regulator (6). An AC voltage (U1) is limited in current by an electronic circuit (1) and a switching unit (2), and is rectified by a diode bridge (3). Voltage (U2) provided by the bridge is filtered by a capacitor (5), and an inrush current is limited by a resistor (4) while charging the capacitor. The voltage (U2) is directly applied to the LEDs through the regulator.

Description

- 1 -- 1 -

Méthode de connexion et d'alimentation de diodes électroluminescentes pour la réalisation de lampes.  Method for connecting and supplying light-emitting diodes for producing lamps.

Les progrès effectués ces dernières années sur la qualité et le rendement des diodes électroluminescentes ont permis de réaliser des lampes utilisant ce type de diodes.  The progress made in recent years on the quality and performance of light-emitting diodes has made it possible to produce lamps using this type of diodes.

Les diodes électroluminescentes ont une tension directe maximale de quelques volts (1 à 5 volts environ, suivant la puissance et la couleur).  Light-emitting diodes have a maximum forward voltage of a few volts (about 1 to 5 volts, depending on the power and color).

Pour réaliser une telle lampe, afin d'obtenir une puissance lumineuse suffisante et bien répartie, il est nécessaire d'utiliser un nombre impertant de diodes électroluminescentes. Pour des tensions d'alimentation assez faibles, telles que les lampes automobiles, les diodes électroluminescentes sont connectées en plusieurs branches parallèles comportant des diodes électroluminescentes en série. Chaque branche série comporte un régulateur de courant ou un moyen électronique de limitation de courant.  To produce such a lamp, in order to obtain sufficient light power and well distributed, it is necessary to use an impervious number of light emitting diodes. For relatively low supply voltages, such as automotive lamps, the light-emitting diodes are connected in several parallel branches with light-emitting diodes in series. Each series branch comprises a current regulator or an electronic current limiting means.

Le fait de connecter un grand nombre de diodes électroluminescentes en série dans une branche à l'inconvénient majeur d'éteindre toutes les diodes électroluminescentes de la branche en cas de défaut d'une seule diode électroluminescente de ladite branche.  The fact of connecting a large number of light-emitting diodes in series in a branch has the major disadvantage of turning off all the light-emitting diodes of the branch in the event of a fault of a single light-emitting diode of said branch.

Néanmoins pour des tension d'alimentation supérieures, il est nécessaire de convertir la tension, soit par un transformateur ou un moyen électronique pour obtenir une tension faible et ensuite alimenter les branches.  However for higher supply voltages, it is necessary to convert the voltage, either by a transformer or an electronic means to obtain a low voltage and then power the branches.

Par exemple, comme illustré dans la figure 1, si l'on veut réaliser une lampe composée de dix branches de dix diodes électroluminescentes rouges (B1 à B10), nous avons une tension par branche (U2) de 25 volts et un moyen limiteur de courant (2) par branche. Le fait de vouloir alimenter cette lampe avec une tension élevée (Ul), 230 volts par exemple, oblige à utiliser un moyen de conversion de tension (3).  For example, as illustrated in FIG. 1, if it is desired to make a lamp composed of ten branches of ten red light-emitting diodes (B1 to B10), we have a voltage per branch (U2) of 25 volts and a limiting means of current (2) per branch. The fact of wanting to supply this lamp with a high voltage (Ul), 230 volts for example, requires the use of a voltage conversion means (3).

Ledit moyen de conversion de tension est souvent un transformateur encombrant et coûteux. De plus les courants mis en jeux sont importants car ils résultent de la somme des courants de chaque branche. - 2 -  Said voltage conversion means is often a cumbersome and expensive transformer. Moreover, the currents involved are important because they result from the sum of the currents of each branch. - 2 -

L'invention concerne ce type de lampe et permet de simplifier la mise en oeuvre de ces diodes électroluminescentes.  The invention relates to this type of lamp and simplifies the implementation of these light emitting diodes.

La figure 2 décrit, dans un exemple de réalisation de l'invention, le schéma d'alimentation de ces diodes électroluminescentes pour une tension alternative élevée.  FIG. 2 depicts, in an embodiment of the invention, the supply diagram of these light-emitting diodes for a high alternating voltage.

Le principe général consiste en la connexion de toutes les diodes électroluminescentes en série réalisant de ce fait une seule branche.  The general principle consists in the connection of all the light emitting diodes in series thereby producing a single branch.

Chaque diode électroluminescente, selon l'invention, est complétée par une diode zener (8) en parallèle sur ladite diode électroluminescente (7). La valeur de tension zener de cette diode zener est supérieure à la tension de la diode électroluminescente alimentée par le régulateur de courant (6). En cas de défaillance d'une diode électroluminescente, sa diode zener associée devient passante et le courant dans toute la branche est maintenu.  Each light-emitting diode, according to the invention, is completed by a zener diode (8) in parallel on said light-emitting diode (7). The zener voltage value of this zener diode is greater than the voltage of the light-emitting diode supplied by the current regulator (6). In case of failure of a light emitting diode, its associated zener diode becomes conductive and the current throughout the branch is maintained.

L'alimentation de la lampe devient relativement simple car le courant mis en jeu est faible et ne correspond qu'au courant nominal d'une diode électroluminescente.  The supply of the lamp becomes relatively simple because the current involved is small and only corresponds to the nominal current of a light-emitting diode.

La tension alternative (U1), est limitée en courant par le circuit (1) et (2), puis redressé par le pont de diodes (3). Un condensateur (5) assure le filtrage de la tension (U2) issue du pont de diode. Une résistance (4) limite l'appel de courant lors de la charge dudit condensateur (5). La tension (U2) est directement appliquée aux diodes électroluminescentes via un régulateur de courant (6).  The AC voltage (U1) is limited in current by the circuit (1) and (2), then rectified by the diode bridge (3). A capacitor (5) filters the voltage (U2) from the diode bridge. A resistor (4) limits the current draw when charging said capacitor (5). The voltage (U2) is directly applied to the light-emitting diodes via a current regulator (6).

Pour des raisons de coût, il est possible, comme décrit dans la figure 3, de ne pas disposer une diode zener en parallèle sur toutes les diodes électroluminescentes mais seulement par groupe de diodes électroluminescentes. Dans ce cas, la défaillance d'une diode électroluminescente d'une branche provoquera l'extinction de toutes les diodes électroluminescentes de la branche, mais le reste des diodes électroluminescentes restera alimenté.  For reasons of cost, it is possible, as described in FIG. 3, not to arrange a zener diode in parallel on all the light-emitting diodes but only for a group of light-emitting diodes. In this case, the failure of a light emitting diode of a branch will cause the extinction of all light emitting diodes of the branch, but the rest of the light emitting diodes will remain powered.

Il est également possible de supprimer l'organe de régulation (6) car le circuit 2) joue déjà un rôle régulation de courant. - 3 -  It is also possible to remove the regulator (6) because the circuit 2) already plays a role in current regulation. - 3 -

Dans une application particulière, telle que les lampes de signalisation routière, il est nécessaire de signaler la défaillance de la lampe.  In a particular application, such as traffic signal lamps, it is necessary to signal the lamp failure.

Lors de l'utilisation de lampes classiques à filament, un contrôleur de feux de signalisation mesure en permanence le courant consommé par la lampe.  When using conventional filament lamps, a traffic light controller continuously measures the current consumed by the lamp.

Pour simuler une lampes à filament, les lampes à diodes électroluminescentes doivent s'éteindre lorsqu'un nombre déterminé de diodes électroluminescentes sont défectueuses.  To simulate a filament lamp, the LED lamps must go out when a fixed number of light-emitting diodes are defective.

La mise en oeuvre des diodes électroluminescentes selon l'invention rend cette fonction facilement réalisable car la tension aux bornes de la branche unique de diodes électroluminescentes est directement proportionnelle au nombre de diodes électroluminescentes défectueuses.  The implementation of the light emitting diodes according to the invention makes this function easily achievable because the voltage across the single branch of light emitting diodes is directly proportional to the number of defective light emitting diodes.

En effet, lors de la défaillance d'une diode électroluminescente, la tension aux borne de celle-ci augmente, car la diode zener à une tension supérieure à ladite diode défectueuse.  Indeed, during the failure of a light emitting diode, the voltage at the terminal thereof increases because the zener diode at a voltage greater than said defective diode.

La figure 4 montre de façon schématique une forme de réalisation de ce moyen de détection.  Figure 4 schematically shows an embodiment of this detection means.

Un circuit électronique (1) mesure et calcule la différence de tension entre les deux entrées (U2) et (U3). Ces tensions sont reprises de la figure 2 et représentent respectivement la tension d'alimentation de la branche et la tension de régulation.  An electronic circuit (1) measures and calculates the voltage difference between the two inputs (U2) and (U3). These voltages are taken from FIG. 2 and represent respectively the supply voltage of the branch and the regulation voltage.

La différence entre (U2) et (U3) résultante est directement proportionnelle au nombre de diodes électroluminescentes défectueuses.  The difference between (U2) and (U3) resulting is directly proportional to the number of defective light emitting diodes.

Lorsqu'un nombre déterminé de diodes électroluminescentes sont défectueuse, le circuit électronique (1) peut, dans cet exemple de réalisation, agir sur le moyen de commutation (2).  When a given number of light-emitting diodes are defective, the electronic circuit (1) can, in this embodiment, act on the switching means (2).

Ledit moyen de commutation (2) permet de couper la régulation et par exemple d'éteindre la lampe en désolidarisant la lampe de son alimentation afin d'indiquer que celle-ci est défectueuse. - 4 -  Said switching means (2) makes it possible to cut the regulation and for example to turn off the lamp by disconnecting the lamp from its power supply to indicate that it is defective. - 4 -

Claims (4)

REVENDICATIONS 1) Méthode de connexion et d'alimentation de diodes électroluminescentes pour la réalisation de lampes caractérisée en ce que les diodes électroluminescentes sont toutes connectées en série associées à des diodes zener en parallèle sur chaque ou plusieurs diodes électroluminescentes pour en assurer la continuité électrique en cas de défaillance d'une ou plusieurs diodes électroluminescentes.  1) A method for connecting and supplying light-emitting diodes for the production of lamps, characterized in that the light-emitting diodes are all connected in series associated with zener diodes in parallel on each or more light-emitting diodes to ensure electrical continuity in case failure of one or more light-emitting diodes. 2) Méthode de connexion et d'alimentation de diodes électroluminescentes pour la réalisation de lampes selon la revendication 1 caractérisée en ce que la tension des diodes zener est supérieure à la tension normale de fonctionnement des diodes électroluminescentes auxquelles elles sont associées.  2) A method for connecting and supplying light-emitting diodes for producing lamps according to claim 1 characterized in that the voltage of the zener diodes is greater than the normal operating voltage of the light-emitting diodes with which they are associated. 3) Méthode de connexion et d'alimentation de diodes électroluminescentes pour la réalisation de lampes selon la revendication 1 ou 2 caractérisée en ce qu'un circuit électronique mesure la tension aux borne des diodes électroluminescentes pour en déduire le nombre de diodes électroluminescentes défectueuse.  3) A method for connecting and supplying light-emitting diodes for producing lamps according to claim 1 or 2 characterized in that an electronic circuit measures the voltage at the terminals of the light-emitting diodes to deduce the number of defective LEDs. 4) Méthode de connexion et d'alimentation de diodes électroluminescentes pour la réalisation de lampes selon la revendication 3 caractérisée en ce que le circuit électronique agit sur un moyen de commutation pour éteindre la lampe.  4) A method for connecting and supplying light-emitting diodes for the production of lamps according to claim 3 characterized in that the electronic circuit acts on a switching means for extinguishing the lamp.
FR0509585A 2005-09-20 2005-09-20 LEDs supplying and connecting method for producing lamp e.g. automobile lamp, involves connecting LEDs in series and associating Zener diode in parallel on each LED, where diode presents Zener voltage value greater than LED voltage Pending FR2891106A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0509585A FR2891106A1 (en) 2005-09-20 2005-09-20 LEDs supplying and connecting method for producing lamp e.g. automobile lamp, involves connecting LEDs in series and associating Zener diode in parallel on each LED, where diode presents Zener voltage value greater than LED voltage

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Application Number Priority Date Filing Date Title
FR0509585A FR2891106A1 (en) 2005-09-20 2005-09-20 LEDs supplying and connecting method for producing lamp e.g. automobile lamp, involves connecting LEDs in series and associating Zener diode in parallel on each LED, where diode presents Zener voltage value greater than LED voltage

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FR2891106A1 true FR2891106A1 (en) 2007-03-23

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008101383A1 (en) * 2007-02-17 2008-08-28 Shenzhen Unibero Technology Co., Ltd Led lamp assembly, series circuit of led lamp assembly and led lighting device
WO2008133792A2 (en) 2007-04-25 2008-11-06 American Bright Lighting, Inc. Solid state lighting apparatus
FR2937492A1 (en) * 2008-10-16 2010-04-23 A R P Signal Light generating device for ensuring dynamic lighting in signal light system, has set of zener diodes, and set of LEDs supplied with power by current source, where each zener diode is connected to corresponding LED in anti-parallel manner
ITAN20090012A1 (en) * 2009-04-08 2010-10-09 Elite Scpa AC / DC POWER SUPPLY AND PILOT OF AT LEAST ONE ELECTRIC LOAD
CN102637683A (en) * 2011-02-11 2012-08-15 杨泰和 Light-emitting diode device sharing individual grading resistors of voltage-limiting components
US8283868B2 (en) 2008-08-21 2012-10-09 American Bright Lighting, Inc. LED light engine
US8669709B2 (en) 2010-08-27 2014-03-11 American Bright Lighting, Inc. Solid state lighting driver with THDi bypass circuit

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US5939839A (en) * 1997-07-07 1999-08-17 Reitter & Schefenacker Gmbh & Co. Kg Circuit for protecting electrically operated lighting elements, especially LEDs, for illumination or signaling purposes
DE19841490A1 (en) * 1998-09-10 2000-03-23 Siemens Ag Failure protection device for series LED's
US6153980A (en) * 1999-11-04 2000-11-28 Philips Electronics North America Corporation LED array having an active shunt arrangement
WO2001001385A1 (en) * 1999-06-29 2001-01-04 Welles Reymond Ac powered led circuits for traffic signal displays
US6203180B1 (en) * 1998-09-22 2001-03-20 Diehl Striftung & Co. Aeroplane cabin lighting arrangement
US20020130786A1 (en) * 2001-01-16 2002-09-19 Visteon Global Technologies,Inc. Series led backlight control circuit
WO2003024159A2 (en) * 2001-09-07 2003-03-20 Aerospace Optics, Inc. Fault tolerant led display

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5939839A (en) * 1997-07-07 1999-08-17 Reitter & Schefenacker Gmbh & Co. Kg Circuit for protecting electrically operated lighting elements, especially LEDs, for illumination or signaling purposes
DE19841490A1 (en) * 1998-09-10 2000-03-23 Siemens Ag Failure protection device for series LED's
US6203180B1 (en) * 1998-09-22 2001-03-20 Diehl Striftung & Co. Aeroplane cabin lighting arrangement
WO2001001385A1 (en) * 1999-06-29 2001-01-04 Welles Reymond Ac powered led circuits for traffic signal displays
US6153980A (en) * 1999-11-04 2000-11-28 Philips Electronics North America Corporation LED array having an active shunt arrangement
US20020130786A1 (en) * 2001-01-16 2002-09-19 Visteon Global Technologies,Inc. Series led backlight control circuit
WO2003024159A2 (en) * 2001-09-07 2003-03-20 Aerospace Optics, Inc. Fault tolerant led display

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008101383A1 (en) * 2007-02-17 2008-08-28 Shenzhen Unibero Technology Co., Ltd Led lamp assembly, series circuit of led lamp assembly and led lighting device
US8258720B2 (en) 2007-04-25 2012-09-04 American Bright Lighting, Inc. Solid state lighting apparatus
WO2008133792A2 (en) 2007-04-25 2008-11-06 American Bright Lighting, Inc. Solid state lighting apparatus
EP2140737A4 (en) * 2007-04-25 2012-02-22 American Bright Lighting Inc Solid state lighting apparatus
US8283868B2 (en) 2008-08-21 2012-10-09 American Bright Lighting, Inc. LED light engine
FR2937492A1 (en) * 2008-10-16 2010-04-23 A R P Signal Light generating device for ensuring dynamic lighting in signal light system, has set of zener diodes, and set of LEDs supplied with power by current source, where each zener diode is connected to corresponding LED in anti-parallel manner
ITAN20090012A1 (en) * 2009-04-08 2010-10-09 Elite Scpa AC / DC POWER SUPPLY AND PILOT OF AT LEAST ONE ELECTRIC LOAD
US8669709B2 (en) 2010-08-27 2014-03-11 American Bright Lighting, Inc. Solid state lighting driver with THDi bypass circuit
CN102637683A (en) * 2011-02-11 2012-08-15 杨泰和 Light-emitting diode device sharing individual grading resistors of voltage-limiting components
EP2487993A3 (en) * 2011-02-11 2013-11-13 Tai-Her Yang LED device with shared voltage-limiting unit and individual voltage-equalizing resistance
CN102637683B (en) * 2011-02-11 2017-04-12 杨泰和 Light-emitting diode device sharing individual grading resistors of voltage-limiting components
TWI583243B (en) * 2011-02-11 2017-05-11 楊泰和 Led device with shared voltage-limiting unit and individual voltage-equalizing resistance
JP2019195075A (en) * 2011-02-11 2019-11-07 楊　泰和 LED device

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