EP1102520A2 - Dispositif de commande de diodes électroluminescentes - Google Patents

Dispositif de commande de diodes électroluminescentes Download PDF

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Publication number
EP1102520A2
EP1102520A2 EP00123897A EP00123897A EP1102520A2 EP 1102520 A2 EP1102520 A2 EP 1102520A2 EP 00123897 A EP00123897 A EP 00123897A EP 00123897 A EP00123897 A EP 00123897A EP 1102520 A2 EP1102520 A2 EP 1102520A2
Authority
EP
European Patent Office
Prior art keywords
leds
led
output
supply voltage
control device
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.)
Withdrawn
Application number
EP00123897A
Other languages
German (de)
English (en)
Other versions
EP1102520A3 (fr
Inventor
Christian Dr.-Ing. Heite
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.)
ABB Patent GmbH
Original Assignee
ABB Patent GmbH
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 ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP1102520A2 publication Critical patent/EP1102520A2/fr
Publication of EP1102520A3 publication Critical patent/EP1102520A3/fr
Withdrawn legal-status Critical Current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]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current

Definitions

  • the invention relates to an arrangement for independent control a number n of light emitting diodes (LEDs).
  • LEDs used in display devices need for a clearly visible indication a current between approx. 1mA and 50mA at a forward voltage of 1.5..2V. If several such LED display elements are required, e.g. to realize a Bargraph display, a correspondingly large power supply unit must be provided become. Battery operation is often discontinued due to the high power consumption of the display device out.
  • the invention has for its object an arrangement for controlling a Specify the number n of LEDs that also form one when using standard LEDs comparatively low power consumption.
  • a basic series connection is used instead of a parallel connection of the LEDs to be controlled. This is due to the relatively minor Forward voltage of the LEDs possible.
  • the maximum number n of in series too switching LEDs depends on the level of the available supply voltage from.
  • the nodes of the LEDs connected in series are also with connected to a port output of the control circuit.
  • the port exits must be in be able to choose either ground, supply voltage, in the high impedance State and to be switched to clock output. This requires in the Practice so-called "multi-function push-pull ports", e.g. with standard microcontrollers available.
  • With a simple microcontroller in the price range 1 to 2 DM an LED bar graph display can be realized, which with 5V supply voltage Power consumption halved. At higher supply voltages the factor is Energy savings even higher, but in practice it is no longer so easy Standard microcontrollers can be implemented for the sake of such microcontrollers limited allowable supply voltage.
  • a control device A is present, which can be a microcontroller.
  • the control device A has connections (not designated) for a supply voltage V DD and ground GND as well as port outputs P1 and P2. Inputs of the control device A for control signals or for the input of control programs are not shown.
  • Two LEDs L1, L2 are arranged in a series circuit, each LED L1, L2 being followed by a current limiting resistor R / 2.
  • the two individual resistors R / 2 have half the value of a total resistance R.
  • the first LED L1 of the series connection is supplied with the supply voltage V DD .
  • Nodes K1, K2 following the current limiting resistor R / 2 in the series circuit are connected to corresponding port outputs P1, P2.
  • the frequency of the clock output should be greater than approximately 100 Hz in order to avoid "flickering".
  • the requirement applies that the average current through the LEDs should be independent of the number of activated LEDs.
  • Fig. 2 shows an arrangement with three LEDs L1, L2, L3 and one downstream Current limiting resistor R / 3, which in this case is the resistance value a third of the total resistance R.
  • the clock outputs T and T * have the same signal shape. However, the "0" States not shifted overlapping each other, as shown in Fig. 5.
  • the Determination of the duty cycle of these square wave signals follows from the considerations at equal averages of LED currents and will be below for general Case of any number n.
  • control arrangement valid for any number of LEDs n is shown in FIG. 3 and requires no further explanation regarding the arrangement.
  • the clock outputs T and T * and T * i have the same signal form. However, the "0" states are not shifted from one another to overlap. As you can easily see, any suitable LED can be controlled individually by a suitable choice of the port states Z (P i ).
  • the supply voltage V DD must be greater than n times the diode flux voltage V L : V DD > nV L
  • V DD kV L with k> n

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  • Led Devices (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP00123897A 1999-11-16 2000-11-03 Dispositif de commande de diodes électroluminescentes Withdrawn EP1102520A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19954911A DE19954911A1 (de) 1999-11-16 1999-11-16 Anordnung zur Ansteuerung von LEDs
DE19954911 1999-11-16

Publications (2)

Publication Number Publication Date
EP1102520A2 true EP1102520A2 (fr) 2001-05-23
EP1102520A3 EP1102520A3 (fr) 2004-12-01

Family

ID=7929103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00123897A Withdrawn EP1102520A3 (fr) 1999-11-16 2000-11-03 Dispositif de commande de diodes électroluminescentes

Country Status (2)

Country Link
EP (1) EP1102520A3 (fr)
DE (1) DE19954911A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159765C2 (de) * 2001-12-05 2003-11-06 Audi Ag Anordnung zur Ansteuerung einer Anzahl von lichtemittierenden Dioden und Verfahren zum Betreiben einer derartigen Anordnung
DE102011076672B3 (de) 2011-05-30 2012-12-06 Osram Ag Signalisierungsvorrichtung und Sensorvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099171A (en) * 1977-01-28 1978-07-04 National Semiconductor Corporation Brightness control in an LED display device
US4532472A (en) * 1980-07-16 1985-07-30 Sharp Kabushiki Kaisha LED level meter
US4644341A (en) * 1984-07-05 1987-02-17 Tri-Tronics Company, Inc. Contrast indicating arrangement in photoelectric sensing systems
DE3927744A1 (de) * 1989-08-23 1991-02-28 Rump Elektronik Tech Analoganzeige mit hilfe einer led-kette

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2506582B2 (de) * 1975-02-17 1978-01-19 Hartmann & Braun Ag, 6000 Frankfurt Schaltungsanordnung zur verlustarmen speisung mehrerer steuerbarer verbraucher
DE3136395A1 (de) * 1981-09-14 1983-04-14 Brown, Boveri & Cie Ag, 6800 Mannheim Schaltungsanordnung zur anzeige von binaersignalen mit leuchtdioden
DE3319779A1 (de) * 1983-05-27 1984-11-29 Siemens AG, 1000 Berlin und 8000 München Elektrisches geraet mit einer schaltungsanordnung zur anzeige mehrerer betriebszustaende durch leuchtdioden
DD234084A1 (de) * 1985-01-18 1986-03-19 Applikationszentrum Elektronik Schaltungsanordnung zur helligkeitssteuerung von gemultiplexten led-anzeigen
DE4022166A1 (de) * 1990-07-12 1992-01-16 Siemens Ag Integrierbare, verlustarme vielfach-led-ansteuerung
EP0967590A1 (fr) * 1998-06-25 1999-12-29 Hewlett-Packard Company Dispositif d'affichage optique utilisant des diodes électroluminescentes et sa méthode de commande

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099171A (en) * 1977-01-28 1978-07-04 National Semiconductor Corporation Brightness control in an LED display device
US4532472A (en) * 1980-07-16 1985-07-30 Sharp Kabushiki Kaisha LED level meter
US4644341A (en) * 1984-07-05 1987-02-17 Tri-Tronics Company, Inc. Contrast indicating arrangement in photoelectric sensing systems
DE3927744A1 (de) * 1989-08-23 1991-02-28 Rump Elektronik Tech Analoganzeige mit hilfe einer led-kette

Also Published As

Publication number Publication date
EP1102520A3 (fr) 2004-12-01
DE19954911A1 (de) 2001-05-17

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