DE10066459B4 - Drive circuit for light emitting diodes has LED current regulating device that detects LED brightness and/or current and compares it with desired value that can be set by controller - Google Patents
Drive circuit for light emitting diodes has LED current regulating device that detects LED brightness and/or current and compares it with desired value that can be set by controller Download PDFInfo
- Publication number
- DE10066459B4 DE10066459B4 DE2000166459 DE10066459A DE10066459B4 DE 10066459 B4 DE10066459 B4 DE 10066459B4 DE 2000166459 DE2000166459 DE 2000166459 DE 10066459 A DE10066459 A DE 10066459A DE 10066459 B4 DE10066459 B4 DE 10066459B4
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- DE
- Germany
- Prior art keywords
- current
- light emitting
- drive circuit
- switching regulator
- led
- 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.)
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Classifications
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- 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
-
- 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
- H05B45/12—Controlling the intensity of the light using optical feedback
Abstract
Description
Die vorliegende Erfindung betrifft eine Ansteuerschaltung für wenigstens eine Leuchtdiode mittels der die Helligkeit der Leuchtdioden (kurz LED's) auf einen gewünschten Wert regelbar ist.The present invention relates to a drive circuit for at least one light-emitting diode by means of which the brightness of the light-emitting diodes (LED's for short) can be regulated to a desired value.
Aus dem Stand der Technik sind verschiedene derartige Ansteuerschaltungen bekannt. So ist z. B. in dem
Die deutsche Patentanmeldung
Weiter ist aus der deutschen Patentanmeldung
Schließlich beschreibt die französische Druckschrift
Aufgabe der vorliegenden Erfindung ist es, eine Ansteuerschaltung für wenigstens eine Leuchtdiode vorzusehen, mit der die Helligkeit der Leuchtdioden in einer verlustarmen Art und Weise und unabhängig von möglichen Spannungsschwankungen der Spannungsversorgung geregelt werden kann.Object of the present invention is to provide a drive circuit for at least one light emitting diode, with which the brightness of the LEDs can be controlled in a low-loss manner and independent of possible voltage fluctuations of the power supply.
Diese Aufgabe wird durch eine Ansteuerschaltung mit den Merkmalen des Anspruches 1 gelöst.This object is achieved by a drive circuit with the features of
Bei der Ansteuerschaltung wird der Strom durch die Leuchtdiode(n) auf einen einstellbaren Sollwert geregelt, wobei der Sollwert bevorzugt durch den Controller einstellbar ist. Das Dimmen der LED's erfolgt somit direkt durch das Dimmen des Stroms durch die Leuchtdioden.In the drive circuit, the current through the light-emitting diode (s) is regulated to an adjustable desired value, wherein the desired value is preferably adjustable by the controller. The dimming of the LED's is thus done directly by dimming the current through the LEDs.
Vorzugsweise kann der Schaltregler in einem AC/DC-Umsetzer integriert sein, der die Schaltung mit der erforderlichen Gleichspannung versorgt. Das heißt, der AC/DC-Umsetzer kann so ausgeführt sein, daß er direkt auf den gewünschten Strom durch die LED's regelt.Preferably, the switching regulator can be integrated in an AC / DC converter, which supplies the circuit with the required DC voltage. That is, the AC / DC converter may be configured to directly control the desired current through the LEDs.
In einer bevorzugten Ausführungsform der Erfindung verändert der Controller durch Einstellen des Sollwerts das Schaltverhalten des die Leuchtdioden ansteuernden Schaltreglers derart, daß die Schaltfrequenz oder das Tastverhältnis des Schaltreglers verändert wird. Vorzugsweise wird zur Regelung des Stroms durch die Leuchtdioden der Strom durch die Leuchtdioden mittels eines mit der Leuchtdiode in Serie geschalteten Meßwiderstands erfaßt und/oder die Helligkeit der Leuchtdioden mittels einer in der unmittelbaren Umgebung der Leuchtdioden angeordneten Photodiode erfaßt.In a preferred embodiment of the invention, by adjusting the setpoint, the controller changes the switching behavior of the switching regulator driving the light-emitting diodes such that the switching frequency or the duty cycle of the switching regulator is changed. Preferably, to control the current through the light emitting diodes of the current through the LEDs detected by means of a light-emitting diode connected in series with the measuring resistor and / or detects the brightness of the LEDs by means disposed in the immediate vicinity of the light emitting diode photodiode.
In einer Ausführungsform wird der Strom durch die Leuchtdioden mittels der über einen steuerbaren Widerstand abfallenden Spannung und/oder die Helligkeit der Leuchtdioden mittels einer in der unmittelbaren Umgebung der Leuchtdioden angeordneten Photodiode erfaßt.In one embodiment, the current through the light-emitting diodes is detected by means of the voltage drop across a controllable resistor and / or the brightness of the light-emitting diodes by means of a photodiode arranged in the immediate vicinity of the light-emitting diodes.
Weitere bevorzugte Ausführungsformen und Weiterbildungen der Erfindung sind Gegenstand weiterer Unteransprüche.Further preferred embodiments and further developments of the invention are the subject of further subclaims.
Die Erfindung wird nachfolgend anhand verschiedener bevorzugter Ausführungsbeispiele unter Bezugnahme auf die anliegenden Zeichnungen näher erläutert. Darin zeigen:The invention will be explained in more detail below with reference to various preferred embodiments with reference to the accompanying drawings. Show:
In den
Die in
Im Falle des in
Der Schaltregler
Die erfindungsgemäße Ansteuerschaltung des in
In dem in
Bei dem in
Zur Einstellung des Sollwertes des Stroms durch die Leuchtdioden sind auch bei dieser Ausführungsform beide der anhand der
Ferner ist es ebenso möglich, das Ausführungsbeispiel von
Claims (6)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10013215A DE10013215B4 (en) | 2000-03-17 | 2000-03-17 | Control circuit for light emitting diodes |
DE2000166459 DE10066459B4 (en) | 2000-03-17 | 2000-03-17 | Drive circuit for light emitting diodes has LED current regulating device that detects LED brightness and/or current and compares it with desired value that can be set by controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000166459 DE10066459B4 (en) | 2000-03-17 | 2000-03-17 | Drive circuit for light emitting diodes has LED current regulating device that detects LED brightness and/or current and compares it with desired value that can be set by controller |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10066459B4 true DE10066459B4 (en) | 2014-05-15 |
Family
ID=50556149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2000166459 Revoked DE10066459B4 (en) | 2000-03-17 | 2000-03-17 | Drive circuit for light emitting diodes has LED current regulating device that detects LED brightness and/or current and compares it with desired value that can be set by controller |
Country Status (1)
Country | Link |
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DE (1) | DE10066459B4 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015114324A1 (en) | 2015-08-28 | 2017-03-02 | Bag Electronics Gmbh | Precise amplitude dimming of the LEDs |
DE102018109045A1 (en) * | 2018-04-17 | 2019-10-17 | Insta Gmbh | Dimming circuit for a non-inert light and dimming method |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0660648A1 (en) * | 1993-12-27 | 1995-06-28 | Illinois Tool Works Inc. | Dimming circuit for a LED |
US5661645A (en) * | 1996-06-27 | 1997-08-26 | Hochstein; Peter A. | Power supply for light emitting diode array |
DE19732828A1 (en) * | 1997-07-30 | 1999-02-04 | Siemens Ag | PWM address circuit for light-emitting diode array |
WO1999007059A2 (en) * | 1997-08-01 | 1999-02-11 | Koninklijke Philips Electronics N.V. | Multiresonant dc-dc converter with full-wave rectifying means |
DE19840511A1 (en) * | 1997-09-09 | 1999-06-10 | Mitsubishi Electric Corp | Power supply control device for a laser diode |
US5912568A (en) * | 1997-03-21 | 1999-06-15 | Lucent Technologies Inc. | Led drive circuit |
FR2775799A1 (en) * | 1998-03-04 | 1999-09-10 | Magneti Marelli France | Vehicle lighting for dashboard illumination and functional indications |
US6016038A (en) * | 1997-08-26 | 2000-01-18 | Color Kinetics, Inc. | Multicolored LED lighting method and apparatus |
DE29919496U1 (en) * | 1999-10-27 | 2000-01-20 | We Ef Leuchten Wolfgang Fritzs | Lighting unit and circuit arrangement for this lighting unit |
DE19841270A1 (en) * | 1998-09-09 | 2000-03-16 | Siemens Ag | Constant current control for LED |
-
2000
- 2000-03-17 DE DE2000166459 patent/DE10066459B4/en not_active Revoked
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0660648A1 (en) * | 1993-12-27 | 1995-06-28 | Illinois Tool Works Inc. | Dimming circuit for a LED |
US5661645A (en) * | 1996-06-27 | 1997-08-26 | Hochstein; Peter A. | Power supply for light emitting diode array |
US5912568A (en) * | 1997-03-21 | 1999-06-15 | Lucent Technologies Inc. | Led drive circuit |
DE19732828A1 (en) * | 1997-07-30 | 1999-02-04 | Siemens Ag | PWM address circuit for light-emitting diode array |
WO1999007059A2 (en) * | 1997-08-01 | 1999-02-11 | Koninklijke Philips Electronics N.V. | Multiresonant dc-dc converter with full-wave rectifying means |
US6016038A (en) * | 1997-08-26 | 2000-01-18 | Color Kinetics, Inc. | Multicolored LED lighting method and apparatus |
DE19840511A1 (en) * | 1997-09-09 | 1999-06-10 | Mitsubishi Electric Corp | Power supply control device for a laser diode |
FR2775799A1 (en) * | 1998-03-04 | 1999-09-10 | Magneti Marelli France | Vehicle lighting for dashboard illumination and functional indications |
DE19841270A1 (en) * | 1998-09-09 | 2000-03-16 | Siemens Ag | Constant current control for LED |
DE29919496U1 (en) * | 1999-10-27 | 2000-01-20 | We Ef Leuchten Wolfgang Fritzs | Lighting unit and circuit arrangement for this lighting unit |
Non-Patent Citations (1)
Title |
---|
Driver for supplying a pulsating current to Light Emitting Diodes. In: Research Disclosure paper journal, Okt. 1995, nr. 37814. - ISSN 0374-4353. URL: http://www.rdjournal.co.uk/rd/search/RD378014.pdf [abgerufen am 06.03.2012] * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015114324A1 (en) | 2015-08-28 | 2017-03-02 | Bag Electronics Gmbh | Precise amplitude dimming of the LEDs |
DE102018109045A1 (en) * | 2018-04-17 | 2019-10-17 | Insta Gmbh | Dimming circuit for a non-inert light and dimming method |
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