EP0695112B1 - Circuit containing light emitting diodes - Google Patents
Circuit containing light emitting diodes Download PDFInfo
- Publication number
- EP0695112B1 EP0695112B1 EP95401760A EP95401760A EP0695112B1 EP 0695112 B1 EP0695112 B1 EP 0695112B1 EP 95401760 A EP95401760 A EP 95401760A EP 95401760 A EP95401760 A EP 95401760A EP 0695112 B1 EP0695112 B1 EP 0695112B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- group
- series
- voltage
- resistor
- emitting diodes
- 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
Links
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 1
Images
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
-
- 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
Definitions
- the present invention relates to a mounting circuit light emitting diodes.
- Light emitting diodes are used especially for lighting display panels, keyboards etc.
- n chains are placed in parallel each comprising p light-emitting diodes placed in series.
- the assembly is supplied with 28 volts direct current and, for control, there is also a variable DC voltage from 0 to 28 volts.
- This control voltage supplies an electronic circuit whose output serves to polarize the base of a transistor put in series in each chain. With this command, the luminance curve, as a function of the supply voltage, of a tube circuit is roughly reproduced.
- the present invention provides a circuit for mounting light emitting diodes for reproducing also the luminance curve as a function of the voltage supply to a tube circuit, in the case where no has only one variable DC voltage.
- the present invention thus relates to a circuit for mounting light-emitting diodes supplied between a variable DC voltage from 0 to V volts and ground, characterized in that it comprises, connected in series, a first resistor R 1 and two groups of light emitting diodes connected in parallel, each group comprising at least one chain comprising P light emitting diodes connected in series, P possibly being equal to 1, in that a second resistor R 2 is furthermore arranged in series in one of the two groups, downstream of the group in the current flow direction, a third resistor R 3 being arranged in series in the other group, upstream of said group and in that a diode is connected between a first point located upstream of said second resistor R 2 and downstream of the group to which it belongs and a second point located downstream of the third resistor R 3 and upstream of the group to which it belongs, said diode assu rant the placing in series of the two groups when the voltage V 2 -V 3 between said first point and said second point reaches the threshold voltage of said dio
- Figure 1 shows the assembly circuit according to the invention.
- Figure 2 is a diagram equivalent to the circuit of the Figure 1 during low voltage power supplies.
- Figure 3 is the same circuit as in Figure 1 but shown in a way more clearly showing the series of two groups of diodes electroluminescent when powering at higher high voltages, the diode being on.
- Figure 4 shows the diode luminance curve electroluminescent mounted in the circuit according to the invention as a function of the supply voltage V, compared to that of a tube circuit.
- FIG. 5 represents a preferred embodiment of the invention.
- This circuit therefore comprises two groups 1 and 2 of light-emitting diodes 3 placed in series in each of the two groups.
- the two groups connected in parallel, are arranged in series with a first resistance R 1 .
- the circuit is supplied between ground and a variable DC voltage from 0 to 28 volts.
- a second resistor R 2 is arranged in series downstream of the light-emitting diodes 3 of group 1 (considering the direction of current flow) and a third resistor R 3 is arranged in series, upstream of the light-emitting diodes 3 of group 2.
- a diode 4 is connected between point 5 located between the last light-emitting diode 3 of group 1 and the second resistor R 2 and point 6 located between the third resistor R 3 and the first light-emitting diode 3 of group 2.
- each group has a chain of four light emitting diodes 3 and that the voltage of threshold for light emitting diodes 3 and diode 4 is of 2 volts.
- diode 4 At low supply voltages, diode 4 is blocked and the circuit is equivalent to a circuit of two groups 1 and 2 connected in parallel as shown in figure 2.
- the voltage at point 6 remains practically constant at 8 volts (4 x 2 volts ) as soon as the threshold voltage of the light-emitting diodes 3 is reached.
- the intensity increases in the single chain of group 2 and the voltage drop increases at the terminals of R 3 .
- the voltage increases since the voltage drop is constant in the light-emitting diodes 3 and equal to approximately 8 volts.
- the circuit proposed is equivalent to a circuit of two mounted groups in parallel, which reduces the threshold voltage of each group of light-emitting diodes ( ⁇ 8 volts).
- Diode 4 being blocked and when the voltage power supply becomes higher and up to 28 volts, the circuit is equivalent to a circuit of two groups 1 and 2 in series ( Figure 3). Consumption is thus limited. The diode 4 is then on.
- the characteristics of the luminance curve are adjusted to get as close as possible to the luminance curve of a tube circuit.
- Curve L in Figure 4 shows schematically the luminance curve of a tube circuit as a function of the supply voltage.
- the curves S-P and S represent the curve of luminance in the case of the present invention as a function of the supply voltage: the S-P curve corresponds to the phase where diode 4 is blocked and curve S at phase where LED 4 is on.
- the choice of the value of the resistors R 1 , R 2 and R 3 makes it possible to follow more or less the curve L of a tube circuit.
- the number P can moreover be equal to 1.
- transverse links 9 ensuring a grid of all the chains of the group.
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
La présente invention concerne un circuit de montage de diodes électroluminescentes.The present invention relates to a mounting circuit light emitting diodes.
Les diodes électroluminescentes sont utilisées notamment pour l'éclairage des panneaux de visualisation, des claviers etc.Light emitting diodes are used especially for lighting display panels, keyboards etc.
On connaít un circuit de montage dans lequel les
diodes électroluminescentes sont groupées en
série/parallèle :
n chaínettes sont mises en parallèles comportant
chacune p diodes électroluminescentes mises en série.
L'ensemble est alimenté sous 28 volts en courant continu et,
pour la commande, on dispose en outre d'une tension continue
variable de 0 à 28 volts. Cette tension de commande alimente
un circuit électronique dont la sortie sert à polariser la
base d'un transistor mis en série dans chaque chaínette.
Avec cette commande, on reproduit à peu près la courbe de
luminance, en fonction de la tension d'alimentation, d'un
circuit à lampes.We know a mounting circuit in which the light emitting diodes are grouped in series / parallel:
n chains are placed in parallel each comprising p light-emitting diodes placed in series. The assembly is supplied with 28 volts direct current and, for control, there is also a variable DC voltage from 0 to 28 volts. This control voltage supplies an electronic circuit whose output serves to polarize the base of a transistor put in series in each chain. With this command, the luminance curve, as a function of the supply voltage, of a tube circuit is roughly reproduced.
La présente invention propose un circuit de montage de diodes électroluminescentes permettant de reproduire également la courbe de luminance en fonction de la tension d'alimentation d'un circuit à lampes, dans le cas où on ne dispose que d'une seule tension continue variable.The present invention provides a circuit for mounting light emitting diodes for reproducing also the luminance curve as a function of the voltage supply to a tube circuit, in the case where no has only one variable DC voltage.
La présente invention a ainsi pour objet un circuit de montage de diodes électroluminescentes alimenté entre une tension continue variable de 0 à V volts et la masse, caractérisé en ce qu'il comprend, montés en série, une première résistance R1 et deux groupes de diodes électroluminescentes reliés en parallèle, chaque groupe comportant au-moins une chaínette comportant P diodes électroluminescentes montées en série, P pouvant être égal à 1, en ce qu'une seconde résistance R2 est en outre disposée en série dans l'un des deux groupes, en aval du groupe dans le sens de passage du courant, une troisième résistance R3 étant disposée en série dans l'autre groupe, en amont dudit groupe et en ce qu'une diode est reliée entre un premier point situé en amont de ladite seconde résistance R2 et en aval du groupe auquel elle appartient et un second point situé en aval de la troisième résistance R3 et en amont du groupe auquel elle appartient, ladite diode assurant la mise en série des deux groupes lorsque la tension V2-V3 entre ledit premier point et ledit deuxième point atteint la tension de seuil de ladite diode.The present invention thus relates to a circuit for mounting light-emitting diodes supplied between a variable DC voltage from 0 to V volts and ground, characterized in that it comprises, connected in series, a first resistor R 1 and two groups of light emitting diodes connected in parallel, each group comprising at least one chain comprising P light emitting diodes connected in series, P possibly being equal to 1, in that a second resistor R 2 is furthermore arranged in series in one of the two groups, downstream of the group in the current flow direction, a third resistor R 3 being arranged in series in the other group, upstream of said group and in that a diode is connected between a first point located upstream of said second resistor R 2 and downstream of the group to which it belongs and a second point located downstream of the third resistor R 3 and upstream of the group to which it belongs, said diode assu rant the placing in series of the two groups when the voltage V 2 -V 3 between said first point and said second point reaches the threshold voltage of said diode.
On va maintenant donner la description d'un exemple de mise en oeuvre de l'invention en se reportant au dessin annexé dans lequel :We will now give the description of an example of implementation of the invention with reference to the drawing annexed in which:
La figure 1 représente le circuit de montage selon l'invention.Figure 1 shows the assembly circuit according to the invention.
La figure 2 est un schéma équivalent au circuit de la figure 1 lors des alimentations à faible tension.Figure 2 is a diagram equivalent to the circuit of the Figure 1 during low voltage power supplies.
La figure 3 est le même circuit que celui de la figure 1 mais représenté d'une façon montrant plus distinctement la mise en série des deux groupes de diodes électroluminescentes lors des alimentations à des plus fortes tensions, la diode étant passante.Figure 3 is the same circuit as in Figure 1 but shown in a way more clearly showing the series of two groups of diodes electroluminescent when powering at higher high voltages, the diode being on.
La figure 4 montre la courbe de luminence des diodes électroluminescentes montées dans le circuit selon l'invention en fonction de la tension V d'alimentation, comparée à celle d'un circuit à lampes.Figure 4 shows the diode luminance curve electroluminescent mounted in the circuit according to the invention as a function of the supply voltage V, compared to that of a tube circuit.
La figure 5 représente une réalisation préférée de l'invention.FIG. 5 represents a preferred embodiment of the invention.
En se référant à la figure 1, on voit ainsi un circuit d'éclairage par diodes électroluminescentes conforme à l'invention.Referring to Figure 1, we thus see a circuit light emitting diodes in accordance with the invention.
Ce circuit comprend donc deux groupes 1 et 2 de diodes
électroluminescentes 3 mises en série dans chacun des deux
groupes. Les deux groupes, reliés en parallèles sont
disposés en série avec une première résistance R1. Le
circuit est alimenté entre la masse et une tension continue
variable de 0 à 28 volts. Une seconde résistance R2 est
disposée en série en aval des diodes électroluminescentes 3
du groupe 1 (en considérant le sens de passage du courant)
et une troisième résistance R3 est disposée en série, en
amont des diodes électroluminescentes 3 du groupe 2.This circuit therefore comprises two groups 1 and 2 of light-emitting
Enfin, une diode 4 est reliée entre le point 5 situé
entre la dernière diode électroluminescente 3 du groupe 1 et
la seconde résistance R2 et le point 6 situé entre la
troisième résistance R3 et la première diode
électroluminescente 3 du groupe 2.Finally, a
Lorsque la tension V2-V3 entre les points 5 et 6
atteint et dépasse la tension de seuil de la diode 4, les
groupes 1 et 2 de diodes électroluminescentes 3 sont mis en
série.When the voltage V 2 -V 3 between
Le fonctionnement est le suivant :The operation is as follows:
On suppose que chaque groupe comporte une chaínette de
quatre diodes électroluminescentes 3 et que la tension de
seuil des diodes électroluminescentes 3 et de la diode 4 est
de 2 volts.We assume that each group has a chain of
four
Aux faibles tensions d'alimentation, la diode 4 est
bloquée et le circuit est équivalent à un circuit de deux
groupes 1 et 2 montés en parallèle comme représenté figure
2. La tension au point 6 reste pratiquement constante à 8
volts (4 x 2 volts) dès lors que la tension de seuil des
diodes électroluminescentes 3 est atteinte. Au fur et à
mesure que la tension d'alimentation augmente, l'intensité
croít dans l'unique chaínette du groupe 2 et la chute de
tension augmente aux bornes de R3. Au point 5, en revanche
la tension croít puisque la chute de tension est constante
dans les diodes électroluminescentes 3 et égale à environ 8
volts.At low supply voltages,
Lors de l'augmentation de la tension d'alimentation,
la chute de tension supplémentaire se produit aux bornes de
la résistance R2, la tension au point 5 augmentant.When the supply voltage increases, the additional voltage drop occurs across the resistor R 2 , the voltage at
Lorsque la tension au point 5 atteint environ 10 volts
on atteint la tension de seuil de la diode 4 (10 volts au
point 5 moins 8 volts au point 6 soit 2 volts) et celle-ci
devient passante mettant les deux groupes 1 et 2 en série
comme on le voit clairement sur la figure 3.When the voltage at
A partir de ce moment, et jusqu'à la tension
d'alimentation maximale de 28 volts, la chute de tension
entre les points 7 et 8 (figure 3) reste pratiquement
constante et égale à environ 18 volts. Au fur et à mesure
que l'intensité croít avec l'augmentation de la tension
d'alimentation, la chute de tension supplémentaire est
absorbée par la résistance R1. En effet, aux bornes de R2 et
de R3 la tension reste pratiquement constante et égale à
environ 10 volts. L'intensité n'augmente pas dans R2 et R3
mais seulement dans la suite en série des diodes
électroluminescentes 3 des groupes 1 et 2.From this moment, and up to the maximum supply voltage of 28 volts, the voltage drop between points 7 and 8 (Figure 3) remains practically constant and equal to approximately 18 volts. As the intensity increases with the increase in the supply voltage, the additional voltage drop is absorbed by the resistor R 1 . Indeed, at the terminals of R 2 and R 3 the voltage remains practically constant and equal to approximately 10 volts. The intensity does not increase in R 2 and R 3 but only in the series sequence of the light-emitting
Ainsi, aux faibles tensions d'alimentation, le circuit
proposé est équivalent à un circuit de deux groupes montés
en parallèle, ce qui permet de réduire la tension de seuil
de chaque groupe de diodes électroluminescentes (≅ 8 volts).
La diode 4 étant bloquée et lorsque la tension
d'alimentation devient plus élevée et jusqu'à 28 volts, le
circuit est équivalent à un circuit de deux groupes 1 et 2
en série (figure 3). La consommation est ainsi limitée. La
diode 4 est alors passante.Thus, at low supply voltages, the circuit
proposed is equivalent to a circuit of two mounted groups
in parallel, which reduces the threshold voltage
of each group of light-emitting diodes (≅ 8 volts).
En jouant sur les valeurs des résistances R1, R2, et R3, on règle les caractéristiques de la courbe de luminance (seuil, courbure) pour se rapprocher au maximum de la courbe de luminance d'un circuit à lampes.By playing on the values of the resistances R 1 , R 2 , and R 3 , the characteristics of the luminance curve (threshold, curvature) are adjusted to get as close as possible to the luminance curve of a tube circuit.
La courbe L de la figure 4 représente schématiquement la courbe de luminance d'un circuit à lampes en fonction de la tension d'alimentation.Curve L in Figure 4 shows schematically the luminance curve of a tube circuit as a function of the supply voltage.
Les courbes S-P et S représentent la courbe de
luminance dans le cas de la présente invention en fonction
de la tension d'alimentation : la courbe S-P correspond à la
phase où la diode 4 et bloquée et la courbe S à la phase où
la diode 4 est passante. The curves S-P and S represent the curve of
luminance in the case of the present invention as a function
of the supply voltage: the S-P curve corresponds to the
phase where
Comme on l'a dit, le choix de la valeur des résistances R1, R2 et R3 permet de suivre plus au moins la courbe L d'un circuit à lampes.As has been said, the choice of the value of the resistors R 1 , R 2 and R 3 makes it possible to follow more or less the curve L of a tube circuit.
Sur la figure 5 qui représente une réalisation
préférée, chaque groupe 1 et 2 de diodes
électroluminescentes 3 est constitué de n (ici n=3)
chaínettes de diodes électroluminescentes 3 mises en
parallèles.In FIG. 5 which represents an embodiment
preferred, each group 1 and 2 of diodes
light emitting 3 consists of n (here n = 3)
light
Chaque chaínette comporte P (ici P=4) diodes
électroluminescentes mises en série. Le nombre P peut
d'ailleurs être égal à 1. En outre, de préférence, afin
d'assurer l'alimentation d'une chaínette en cas de
défaillance de l'une des diodes électroluminescentes d'une
chaínette, elles sont reliées par des liaisons transversales
9 assurant un quadrillage de l'ensemble des chaínettes du
groupe.Each chain has P (here P = 4) diodes
electroluminescent put in series. The number P can
moreover be equal to 1. In addition, preferably, so
ensure the supply of a chain in case of
failure of one of the light emitting diodes of a
chain, they are connected by
Claims (2)
- A circuit for the connection of electroluminescent diodes (3) supplied with a direct current voltage variable from 0 to V volts and earth, characterised in that it comprises, mounted in series, a first resistor R1 and two groups (1, 2) of electroluminescent diodes connected in parallel, each group comprising at least one small chain comprising P-series connected electroluminescent diodes (3), P being equal to 1, in that a second resistor R2 is furthermore disposed in series in one of the two groups, downstream of the group in the direction of current passage, a third resistor R3 being disposed in series in the other group, upstream of the said group and in that a diode (4) is connected between a first point (5) situated upstream of the said second resistor R2 and downstream of the group to which it belongs and a second point (6) situated downstream of the third resistor R3 and upstream of the group to which it belongs, the said diode (4) ensuring the series connection of the two groups (1, 2) when the voltage V2 - V3 between the said first point (5) and the said second point (6) reaches the threshold voltage of the said diode (4).
- A connection circuit according to claim 1, characterised in that each group comprises n said chains connected in parallel.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9409429 | 1994-07-29 | ||
FR9409429A FR2723286B1 (en) | 1994-07-29 | 1994-07-29 | LIGHT EMITTING DIODE MOUNTING CIRCUIT |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0695112A1 EP0695112A1 (en) | 1996-01-31 |
EP0695112B1 true EP0695112B1 (en) | 1999-10-13 |
Family
ID=9465892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95401760A Expired - Lifetime EP0695112B1 (en) | 1994-07-29 | 1995-07-25 | Circuit containing light emitting diodes |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0695112B1 (en) |
DE (1) | DE69512720T2 (en) |
FR (1) | FR2723286B1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2745458B1 (en) * | 1996-02-28 | 1998-04-10 | Valeo Electronique | IMPROVEMENT ON ILLUMINATION CIRCUITS WITH LIGHT EMITTING DIODES, PARTICULARLY FOR MOTOR VEHICLES, SIGNALING LIGHT AND CONTROL PANEL INCORPORATING THE SAME |
US6885035B2 (en) * | 1999-12-22 | 2005-04-26 | Lumileds Lighting U.S., Llc | Multi-chip semiconductor LED assembly |
DE10032840A1 (en) * | 2000-07-06 | 2002-01-17 | Sick Ag | Optoelectronic sensor |
US6323598B1 (en) | 2000-09-29 | 2001-11-27 | Aerospace Optics, Inc. | Enhanced trim resolution voltage-controlled dimming led driver |
US6653798B2 (en) | 2000-09-29 | 2003-11-25 | Aerospace Optics, Inc. | Voltage dimmable LED display producing multiple colors |
US6650064B2 (en) | 2000-09-29 | 2003-11-18 | Aerospace Optics, Inc. | Fault tolerant led display design |
US6489728B2 (en) | 2000-09-29 | 2002-12-03 | Aerospace Optics, Inc. | Power efficient LED driver quiescent current limiting circuit configuration |
FR2814906B1 (en) * | 2000-09-29 | 2003-06-27 | Thomson Csf | LIGHTING MEANS CONTROL DEVICE |
FR2821520B1 (en) * | 2001-02-23 | 2003-08-29 | Thomson Csf | LIGHT-EMITTING DIODE LIGHTING CONTROL DEVICE |
US20090160365A1 (en) * | 2006-05-10 | 2009-06-25 | Paavo Niemitalo | Apparatus Having Supply Voltage Adaptive Light Emitting Component Circuitry And Method Of Controlling |
DE102006029957A1 (en) * | 2006-06-29 | 2008-01-03 | Osram Opto Semiconductors Gmbh | lighting device |
US7906915B2 (en) | 2008-04-19 | 2011-03-15 | Aerospace Optics, Inc. | Enhanced trim resolution voltage-controlled dimming LED driving circuit |
ATE557574T1 (en) | 2008-07-30 | 2012-05-15 | Koninkl Philips Electronics Nv | DEVICE HAVING LIGHT EMISSION DIODE CIRCUITS |
RU2511714C2 (en) * | 2008-10-02 | 2014-04-10 | Конинклейке Филипс Электроникс Н.В. | Layout of light-emitting diode circuit with improved twinkling performance |
RU2563042C2 (en) | 2010-10-19 | 2015-09-20 | Конинклейке Филипс Электроникс Н.В. | Light diode circuit layout |
JP7335324B2 (en) * | 2018-08-17 | 2023-08-29 | シグニファイ ホールディング ビー ヴィ | LED drive circuit |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3622025C1 (en) * | 1986-07-01 | 1987-10-15 | Tele Security Foto Ueberwachun | Infrared luminaire |
-
1994
- 1994-07-29 FR FR9409429A patent/FR2723286B1/en not_active Expired - Fee Related
-
1995
- 1995-07-25 EP EP95401760A patent/EP0695112B1/en not_active Expired - Lifetime
- 1995-07-25 DE DE69512720T patent/DE69512720T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69512720T2 (en) | 2000-06-08 |
DE69512720D1 (en) | 1999-11-18 |
FR2723286A1 (en) | 1996-02-02 |
FR2723286B1 (en) | 1996-09-13 |
EP0695112A1 (en) | 1996-01-31 |
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