EP2271180B1 - Dispositif de commutation destiné à la commande de diodes luminescentes - Google Patents

Dispositif de commutation destiné à la commande de diodes luminescentes Download PDF

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Publication number
EP2271180B1
EP2271180B1 EP10005622.5A EP10005622A EP2271180B1 EP 2271180 B1 EP2271180 B1 EP 2271180B1 EP 10005622 A EP10005622 A EP 10005622A EP 2271180 B1 EP2271180 B1 EP 2271180B1
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EP
European Patent Office
Prior art keywords
leds
led
brightness
current
arrangement 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.)
Not-in-force
Application number
EP10005622.5A
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German (de)
English (en)
Other versions
EP2271180A1 (fr
Inventor
Jan Ellmann
Michael Gültig
Martin Pados
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.)
INIT Innovative Informatikanwendungen in Transport Verkehrs und Leitsystemen GmbH
Original Assignee
INIT Innovative Informatikanwendungen in Transport Verkehrs und Leitsystemen GmbH
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Application filed by INIT Innovative Informatikanwendungen in Transport Verkehrs und Leitsystemen GmbH filed Critical INIT Innovative Informatikanwendungen in Transport Verkehrs und Leitsystemen GmbH
Publication of EP2271180A1 publication Critical patent/EP2271180A1/fr
Application granted granted Critical
Publication of EP2271180B1 publication Critical patent/EP2271180B1/fr
Not-in-force 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
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the invention relates to an arrangement according to claim 1.
  • an arrangement for driving light-emitting diodes which serve as a light bar display.
  • the assembly has a driver which has outputs by which power is supplied to the LED.
  • the arrangement further has at least one control input and a control element, by means of which the number of each simultaneously supplied with power LED can be detected.
  • the control input can be acted upon by a signal dependent on the determined number.
  • the power supply for LED is dimensioned for safety reasons, that they can supply all LEDs at the same time with the required power. The power supply must therefore have a correspondingly high output power.
  • control element characterized in that a control element is present, by means of which the number of each simultaneously supplied with power LED can be determined, the size of the supplied power supply from the respective total power can be determined, and thus determined whether the power supply would be overloaded. Because the control input can be acted upon by a signal dependent on the number determined, it is advantageously possible to control the current supplied to the LED. In particular, it is possible to limit the current supplied to the LED. This can ensure that the power supply is not overloaded.
  • the power supply can be designed so that it can supply only a part of the combined, for example, to a display panel LED with power.
  • a display board usually displays characters or images, it is normal for a display panel that not all the LEDs combined to the display panel light up at the same time and thus have to be supplied with power. For example, if you notice that on average, only about 50 percent of the LED combined into the display panel will light up and therefore need power, the power supply only needs to power half of the LED on the display board be interpreted. This has a very beneficial effect on the size and the cost of the power supply.
  • control element is designed as a counter.
  • the number of LEDs corresponding to the relevant image content can be determined in a particularly simple manner in each case simultaneously with power.
  • the arrangement has a microcontroller for controlling the LED.
  • the respective image content is therefore already available in digitized form, so that it is easy to determine which or how many LEDs need to be supplied with power.
  • the driver has an activation input, by means of which the current available to the LED can be switched.
  • the current that can be supplied to the LED can be controlled by means of a pulse-width-modulated (PWM) signal.
  • PWM pulse-width-modulated
  • the driver has an actuating input, by means of which the current which can be supplied to the LED can be set by an analog signal, and which is connected to the output of a voltage source.
  • the current to be supplied to the LED may optionally be adjusted in addition to a setting by means of a PWM signal by means of an analog signal.
  • the current supplied to the LED could be controlled in the lower region by means of the PWM signal and in the upper region by means of the analog signal.
  • the current supplied to the LED that is to say the output current of the power supply
  • the output current of the power supply is not set in the upper range by means of a pulse width modulation, it is avoided that current peaks occur during the switch-on phase of the PWM signal which exceed the maximum permissible output current of the PWM signal Exceed power supply. This could be the case, for example, if too large a number of LEDs have to be supplied with power at the same time.
  • the output current of the power supply unit can be in the upper range, ie in the range of 50 percent to 100 percent of the maximum permitted output power of the power supply unit by means of the Control input applied analog signal can be set.
  • the voltage source has a voltage source control input, by means of which the output voltage of the voltage source is controllable. This makes it easy to adjust the power supplied to the LED. It is very advantageous in this embodiment, when the voltage source control input of the voltage source is connected to an adjustable voltage divider whose total voltage is adjustable.
  • the voltage divider By means of the voltage divider, the basic brightness of a sub-group (board) controlled, for example, by a plurality of drivers controlled in parallel by a plurality of drivers in parallel, can thus be set from a LED combined to form a display panel. That is, the basic brightness of the board in question can be adjusted to the basic brightness of neighboring boards.
  • the current can be adjusted simultaneously by all the LEDs to be energized for the relevant image content and thus their brightness.
  • At least one sensor for detecting the ambient brightness of the LED or the display panel is present, wherein the control input can be acted upon by a signal dependent on the ambient brightness.
  • the brightness of the LED should be increased to increase the contrast and make the display more readable.
  • the voltage applied to the voltage divider total voltage can be increased. This also increases the voltage delivered by the voltage divider and thus the voltage delivered by the voltage source and thus the current flowing through the LED and thus the brightness of the LED. However, this only if it was determined by means of the control element that the number of LEDs to be energized is not so great that the maximum permissible output power of the power supply unit is not exceeded. If the ambient brightness decreases, the brightness of the LED should be reduced so that the display does not fade or outshone. For this purpose, the voltage applied to the voltage divider total voltage can be reduced, which has the consequence that the brightness of the LED is reduced.
  • an averager for forming the time average of the ambient brightness of the LED.
  • short-term changes in the ambient brightness as may be caused for example by an external light source or caused by, for example, a motor vehicle shadowing, leveled.
  • At least one sensor for detecting the ambient temperature of the LED is present, wherein the control input can be acted upon by a signal dependent on the ambient temperature.
  • the temperature sensor can be achieved in an advantageous manner that reduces the power supplied to the LED power when the ambient temperature of the LED is high. This has a very beneficial effect on the life of the LED.
  • a plurality of temperature sensors are present, as well as a temperature maximum value generator, for forming the maximum of the output signals of the temperature sensors.
  • Fig. 1 can be removed, in each case a group 1G of a total of sixteen LED 1 by a driver 2, at the corresponding outputs 2A, the LED 1 are connected, controlled.
  • the drivers 2 contain a shift register into which 2D data can be read via a serial data input. According to the data contained in the shift register, the LED 1 can be energized.
  • the respective driver 2 which may be, for example, a Low Voltage 16-bit Constant Current LED Sink Driver SDP 16CP596 from ST, furthermore has an actuating input 2S, which is connected to the output 3A of a voltage source 3.
  • actuating input 2S which is connected to the output 3A of a voltage source 3.
  • sixty LED groups 1 G can be combined to form a board 5 and from a common voltage source 3 are controlled.
  • the voltage source 3 is formed in a conventional manner and has a first operational amplifier 6 whose output is connected to the gate terminal 7G of a field effect transistor 7 and thus drives the field effect transistor 7.
  • the drain terminal 7D of the field effect transistor 7, which also forms the output 3A of the voltage source 3, is connected via a resistor 8 to the positive input of the first operational amplifier 6.
  • the source terminal 7S of the field effect transistor 7 is connected to ground.
  • a self-generated reference voltage V Ref is connected at the minus input of the first operational amplifier 6.
  • the constant reference voltage V Ref and the values of the components used in this circuit part were chosen such that the desired associated analog voltage at the setpoint input 2S of the driver 2 results for a certain analog value of the input voltage V Boost .
  • the first operational amplifier 6 in this case works in combination with the field effect transistor 7 as an inverting amplifier.
  • the positive input of the first operational amplifier 6 is connected via a resistor 11 to a voltage divider consisting of two resistors 12, 13 and a potentiometer 14.
  • the voltage divider is fed by a second operational amplifier 15 whose positive input represents a boost input 16 of the voltage source 3.
  • the negative input of the second operational amplifier 15 is connected to the output of the second operational amplifier 15.
  • the second operational amplifier 15 is thus used as a voltage follower.
  • the voltage applied by the voltage source 3 to the set inputs 2S of the driver 2 can be adjusted.
  • a base voltage applied to the set inputs 2S of the drivers 2 at a first predetermined voltage V boost at the boost input 16 can be adjusted by means of the potentiometer 14. That is, by means of the potentiometer 14, the V at the first predetermined voltage boost can be known brightness of the driven by the respective drivers 2 LED of the V at the same first predetermined voltage boost existing brightness in the area arranged respectively adjacent LED whose driver from a other voltage source to be controlled.
  • the first predetermined voltage V Boost can be selected so that the LEDs 1 are operated with a current which corresponds to approximately half of their maximum permissible current. If the brightness of the LED 1 is to be increased because, for example, the brightness of the ambient light has increased, the voltage V boost is correspondingly increased. This increases the total voltage V 0 applied to the voltage divider, with the result that the voltage applied by the voltage source 3 to the set inputs 2S of the driver 2 increases, as a result of which the drivers 2 connected to the output 3A of the voltage source 3 all uniformly supply the current Enlarge by the corresponding driven LED 1, resulting in a uniform brightness change of the LED in question.
  • the drivers 2 further have an activation input 2E, which are connected to the output 22A of a pulse width modulator 22.
  • the activation inputs 2E By means of the activation inputs 2E the current supplied to the LED 1 can be switched on or off. If the PWM signal is in its switch-on phase, ie at its "high" level, the driver 2 supplies current to the LED 1 determined by the content of the shift register. The middle delivered to the LED 1 Current and thus the average brightness of the LED 1 thus depends on the duty cycle or the duty cycle of the PWM signal.
  • the boost input 16 of the voltage source 3 is connected to the output 23A of a block 23.
  • the size (amplitude) of the current supplied to the LED 1 can thus be adjusted.
  • a PWM signal is present at the activation inputs 2E of the driver 2, the amplitude of the pulse-width-modulated current supplied to the LED 1 can be adjusted by means of the signal output by the block 23.
  • the input of the pulse width modulator 22 and the input of the block 23 are connected to a controller 29. Furthermore, the data inputs 2D of the drivers 2 are connected to the controller 29. This allows controller 29 to load data into the shift register of driver 2.
  • the controller 29 is further connected to the output of a counter 28 which counts the data loaded in the shift registers of the driver 2, but only those having the state which causes the corresponding LED 1 to be powered.
  • the corresponding pulses are applied to a first input of the counter 28.
  • a signal indicating that an image is terminated is transmitted to the controller 29 and then set to zero.
  • the value of the counter 28 is compared with a predetermined value which the controller 29 includes from a defaulting member 24 whose output is connected to an input of the controller 29.
  • the predetermined value corresponds to the maximum number of LEDs under the given conditions, which can be supplied with power at the same time, without the maximum permissible output power of the device supplying power to the arrangement being exceeded Power supply is exceeded. If the value of the counter 29 is greater than the predetermined value, the controller 29 causes the pulse width modulator 22 to output a signal which reduces the average current supplied to the relevant LED 1 to such an extent that the maximum permissible output power of the power supply unit is not exceeded. Depending on how large the value of the counter 28 is, the controller 29 may also cause the block 23 to reduce the voltage V boost applied to the boost input 16.
  • the default member 24 has a first input connected to the output of an averager 25.
  • the mean value generator forms the mean value of signals output by a brightness maximum value generator 26.
  • the average is determined, for example, from ten successive output signals of the brightness maximum value generator 26.
  • For each formation of the mean value which can be done once per second, for example, a new maximum value is taken into account and the oldest maximum value is taken out of the calculation.
  • the brightness maximum value generator 26 is connected to two brightness sensors 21 a, 21 b, from whose output signals it forms the maximum, for example, every second.
  • the default member 24 further includes a second input connected to a temperature peaking device 27.
  • the temperature maximum value generator 27 is connected to a multiplicity of temperature sensors 20, from whose output signals it forms the maximum, for example, every second.
  • the default member 24 forms from the average value obtained from the averager 25 and the maximum value obtained from the temperature maximum value image 27, the predetermined value transmitted to the controller 29.
  • the default element 24 taking into account the parameters of the power supply used, the average brightness detected by the brightness sensors 21a, 21b and the maximum temperature detected by the temperature sensors 20, respectively forms the setpoint value (maximum value) of the number of LEDs that is fully charged by the relevant power supply unit (desired) power can be supplied.
  • the controller 29 controls the pulse width modulator 22 and the block 23.
  • the control takes place in such a way that, in the case of a previously determined theoretical overload, first the voltage at the output 23a of the block 23 is reduced. As a result, the current supplied by the outputs 2a of the drivers 2 to the LED 1 decreases as a result.
  • the pulse-pause ratio of the pulse width modulator 22 is at this time 100%, that is, at the output 22a of the pulse width modulator 22 is a constant output voltage. As a result, the power supplied by the drivers 2 to the LED 1 is not interrupted.
  • the output voltage output by the block 23 is reduced until it has reached a minimum value.
  • the duty cycle of the pulse width modulator 22 is reduced. That is, the LED 1 are then no longer supplied with a continuous power, but with a pulsed current.
  • a display panel 4 may have six to sixty boards 5, with one board having, for example, sixty groups 1G each consisting of sixteen LEDs.
  • the brightness of the located on the board 5 'LED is adjusted by means of the potentiometer 14 at the same predetermined voltage V Boost to the brightness of the adjacent boards 5 " ,
  • a temperature sensor 20 is mounted on each board 5.
  • brightness sensors 21a, 21b are arranged.

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  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Led Devices (AREA)

Claims (9)

  1. Dispositif destiné à commander des diodes électroluminescentes (LED) (1) qui sont en particulier regroupées en un panneau d'affichage (4), dans lequel le dispositif comprend au moins un circuit d'attaque (2) comportant des sorties (2A) au moyen desquelles un courant peut être délivré aux LED (1), ainsi qu'au moins une entrée de commande (2E, 2S) au moyen de laquelle le courant pouvant être délivré aux LED (1) peut être commandé, dans lequel le circuit d'attaque (2) contient un registre à décalage dans lequel des données peuvent être lues en l'entrée par l'intermédiaire d'une entrée de données série (2D), et dans lequel un courant peut être appliqué aux les LED (1) d'une manière qui correspond aux données contenues dans le registre à décalage,
    caractérisé en ce que le dispositif comprend un élément de commande (28) au moyen duquel il est possible de déterminer le nombre des LED (1) respectives devant être alimentées simultanément en courant, dans lequel un signal dépendant du nombre déterminé peut être appliqué à l'au moins une entrée de commande (2E, 2S).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que l'élément de commande est réalisé sous la forme d'un compteur.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en cé que le circuit d'attaque (2) comporte une entrée d'activation (2E) au moyen de laquelle il est possible de commuter le courant pouvant être délivré aux LED (1).
  4. Dispositif selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que le circuit d'attaque (2) comprend une entrée de positionnement (2S) au moyen de laquelle le courant pouvant être délivré aux LED (1) peut être réglé et qui est connectée à la sortie (3A) d'une source de tension (3).
  5. Dispositif selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce qu'il est prévu au moins un capteur (21a, 21b) destiné à détecter la luminosité ambiante des LED (1), dans lequel un signal dépendant de la luminosité ambiante peut être appliqué à l'entrée de commande (2E, 2S).
  6. Dispositif selon la revendication 5,
    caractérisé en ce qu'il est prévu un générateur de valeur moyenne (25) destiné à établir la valeur moyenne dans le temps de la luminosité ambiante des LED (1).
  7. Dispositif selon la revendication 5 ou 6,
    caractérisé en ce qu'il est prévu de multiples capteurs de luminosité (21a, 21b) et en ce qu'il est prévu un générateur de valeur maximale de luminosité (26) destiné à établir le maximum à partir des signaux de sortie des capteurs de luminosité (21a, 21b).
  8. Dispositif selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce qu'il est prévu au moins un capteur (20) destiné à détecter la température ambiante des LED (1), dans lequel un signal dépendant de la température ambiante peut être appliqué à l'entrée de commande (2E).
  9. Dispositif selon la revendication 8,
    caractérisé en ce qu'il est prévu de multiples capteurs de température (20) et en ce qu'il est prévu un générateur de valeur maximale de température (27) destiné à établir le maximum à partir des signaux de sortie des capteurs de température (20).
EP10005622.5A 2009-06-24 2010-05-29 Dispositif de commutation destiné à la commande de diodes luminescentes Not-in-force EP2271180B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009030176.3A DE102009030176B4 (de) 2009-06-24 2009-06-24 Anordnung zur Ansteuerung von Licht emittierenden Dioden

Publications (2)

Publication Number Publication Date
EP2271180A1 EP2271180A1 (fr) 2011-01-05
EP2271180B1 true EP2271180B1 (fr) 2015-11-04

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Application Number Title Priority Date Filing Date
EP10005622.5A Not-in-force EP2271180B1 (fr) 2009-06-24 2010-05-29 Dispositif de commutation destiné à la commande de diodes luminescentes

Country Status (4)

Country Link
US (1) US8310167B2 (fr)
EP (1) EP2271180B1 (fr)
CA (1) CA2707553C (fr)
DE (1) DE102009030176B4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8723427B2 (en) 2011-04-05 2014-05-13 Abl Ip Holding Llc Systems and methods for LED control using on-board intelligence
DE102018118876A1 (de) * 2018-08-03 2020-02-06 HELLA GmbH & Co. KGaA Verfahren und Mittel zum Einstellen einer Stromquelle für ein Leuchtdiodenfeld

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2364301A1 (de) * 1973-12-22 1975-06-26 Itt Ind Gmbh Deutsche Mit einer spule geschaltete leuchtdiode
DE10061370A1 (de) * 2000-12-09 2002-06-20 Infineon Technologies Ag Schaltungsanordnung zur Ansteuerung einer Last
CA2336497A1 (fr) * 2000-12-20 2002-06-20 Daniel Chevalier Dispositif d'eclairage
JP2004163673A (ja) * 2002-11-13 2004-06-10 Toshiba Corp 表示装置
KR20070034457A (ko) * 2004-03-10 2007-03-28 코닌클리케 필립스 일렉트로닉스 엔.브이. 소비전력 감소의 능동행렬 표시장치
EP1742462A1 (fr) * 2005-07-08 2007-01-10 Koninklijke Philips Electronics N.V. Dispositif numerique de prise de vue avec un flash de balayage
US8791645B2 (en) * 2006-02-10 2014-07-29 Honeywell International Inc. Systems and methods for controlling light sources
US7301478B1 (en) * 2006-03-03 2007-11-27 Overland Safety Technologies Corporation Vehicle safety warning device
US8207686B2 (en) * 2006-09-05 2012-06-26 The Sloan Company, Inc. LED controller and method using variable drive currents
TWI346930B (en) * 2006-12-01 2011-08-11 Ind Tech Res Inst Method for driving a light source and a backing light source
WO2008142602A2 (fr) * 2007-05-16 2008-11-27 Koninklijke Philips Electronics N. V. Commande de puissance dynamique pour des écrans d'affichage
US7956824B2 (en) * 2007-07-26 2011-06-07 Stmicroelectronics S.R.L. Light emitting element driver device
US7999491B2 (en) * 2008-12-02 2011-08-16 Ememory Technology Inc. LED lighting control integrated circuit having embedded programmable nonvolatile memory

Also Published As

Publication number Publication date
CA2707553C (fr) 2013-08-06
EP2271180A1 (fr) 2011-01-05
US8310167B2 (en) 2012-11-13
DE102009030176A1 (de) 2011-01-27
CA2707553A1 (fr) 2010-12-24
US20100327756A1 (en) 2010-12-30
DE102009030176B4 (de) 2014-02-06

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