DE102007045777A1 - Scalable LED control with minimized power loss - Google Patents
Scalable LED control with minimized power loss Download PDFInfo
- Publication number
- DE102007045777A1 DE102007045777A1 DE102007045777A DE102007045777A DE102007045777A1 DE 102007045777 A1 DE102007045777 A1 DE 102007045777A1 DE 102007045777 A DE102007045777 A DE 102007045777A DE 102007045777 A DE102007045777 A DE 102007045777A DE 102007045777 A1 DE102007045777 A1 DE 102007045777A1
- Authority
- DE
- Germany
- Prior art keywords
- led
- voltage
- output signal
- led chains
- circuit arrangement
- 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.)
- Ceased
Links
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]
- H05B45/30—Driver circuits
- H05B45/347—Dynamic headroom control [DHC]
-
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Die Erfindung betrifft eine elektrische Schaltungsanordnung, bestehend aus 1 bis n parallel geschalteten LED-Ketten (2) mit jeweils mindestens einer LED (4) und mit jeweils einer gesteuerten Stromquelle (6), wobei die LED-Ketten an einem gemeinsamen steuerbaren Spannungsregler (14) mit einer Betriebsspannung betrieben werden. Weiterhin betrifft die Erfindung ein Verfahren zur Ansteuerung der beschriebenen elektrischen Schaltungsordnung. Der erfinderische Grundgedanke der Lösung liegt in der Minimierung der Gesamtverlustleistung der parallel geschalteten LED-Ketten (2) durch Bestimmung der minimal notwendigen Betriebsspannung jeder einzelnen LED-Kette (2) im bestromten Zustand der LEDs (4) und in der Ansteuerung des gemeinsamen Spannungsreglers (14).The invention relates to an electrical circuit arrangement comprising 1 to n parallel connected LED chains (2) each having at least one LED (4) and each having a controlled current source (6), wherein the LED chains on a common controllable voltage regulator (14 ) are operated with an operating voltage. Furthermore, the invention relates to a method for driving the described electrical circuit order. The inventive idea of the solution lies in the minimization of the total power loss of parallel LED chains (2) by determining the minimum required operating voltage of each LED chain (2) in the energized state of the LEDs (4) and in the control of the common voltage regulator ( 14).
Description
Die Erfindung betrifft eine elektrische Schaltungsanordnung gemäß dem Oberbegriff des Anspruchs 1. Weiterhin betrifft die Erfindung gemäß Anspruch 6 ein Verfahren zur Ansteuerung der im Oberbegriff des Anspruchs 1 beschriebenen elektrischen Schaltungsordnung.The The invention relates to an electrical circuit arrangement according to the preamble of claim 1. Furthermore, the invention according to claim Fig. 6 shows a method for controlling the preamble of the claim 1 described electrical circuit order.
Derartige Schaltungsanordnungen von LEDs in einer Kette oder in mehreren parallel geschalteten Ketten finden zunehmend Verwendung als Hinterleuchtung von Displays, insbesondere für den Einsatz in Fahrerinformationssystemen im Automobilbereich. Die parallel geschalteten Ketten liegen an einer gemeinsamen Spannungsquelle, wodurch sich der Wirkungsgrad der Schaltungsanordnung verschlechtert, weil die Unterschiede zwischen den LED-Durchlassspannungen in Verlustleistungen umgesetzt werden. Wegen der Vielzahl der auf engem Raum verbauten LEDs stellt sich hier das Problem, die durch die Verlustleistung in den Halbleiterbauelementen entstehende Wärme abzuführen.such Circuit arrangements of LEDs in a chain or in several parallel switched chains are increasingly being used as backlighting of displays, especially for the use in driver information systems in the automotive sector. The parallel-connected chains are connected to a common voltage source, whereby the efficiency of the circuit deteriorates, because the differences between the LED forward voltages in power losses be implemented. Because of the variety of built in a small space LEDs here poses the problem caused by the power loss Dissipate heat generated in the semiconductor devices.
Dem Stand der Technik entsprechend wird dieses Problem durch zusätzliche Wärmeabfuhrmaßnahmen gelöst. Dazu zählen das Verbauen von großflächigen Kühlkörpern oder eine erzwungene Konvektion durch Lüfter. Auch durch Selektion von LEDs mit schmalen Toleranzbereichen in den elektrischen Kenndaten oder durch die Verwendung von CCFL-Röhren (Cold Cathode Fluorescent Lamp) kann die Verlustleistung gesenkt werden.the According to the prior art, this problem is caused by additional Heat dissipation measures solved. These include the installation of large-area heat sinks or a forced convection by fans. Also by selection of LEDs with narrow tolerance ranges in the electrical characteristics or by the use of CCFL tubes (Cold Cathode Fluorescent Lamp), the power loss can be reduced.
Diese bekannten Maßnahmen weisen jedoch den Nachteil auf, dass sie entweder zu viel Bauraum beanspruchen, wie im Fall der Kühlkörper und der Lüfter, da dieser in aller Regel stark begrenzt ist oder die Lösung zu kostspielig, wie im Fall der Verwendung selektierter Bauteile.These known measures However, they have the disadvantage that they either too much space claim, as in the case of the heat sink and the Fan, as this is usually very limited or the solution too expensive, as in the case of the use of selected components.
Der Erfindung liegt daher die Aufgabe zu Grunde, bei einer Schaltungsanordnung der eingangs beschriebenen Art die Verlustleistung weiter zu reduzieren, sodass zusätzliche aufwändige Wärmeabfuhrmaßnahmen entfallen können.Of the The invention is therefore based on the object, in a circuit arrangement the type described above to further reduce the power loss, so additional complex Heat dissipation measures can be omitted.
Diese Aufgabe wird durch die kennzeichnenden Merkmale in Anspruch 1 in Verbindung mit den kennzeichnenden Merkmalen in Anspruch 6 gelöst.These The object is achieved by the characterizing features in claim 1 in Connection solved with the characterizing features in claim 6.
Der erfinderische Grundgedanke der Lösung in den Merkmalen des Anspruchs 1 und des Anspruchs 6 liegt in der Minimierung der von den Halbleiterbauelementen in den parallel geschalteten LED-Ketten erzeugten Gesamtverlustleistung. Gelöst wird diese Aufgabe durch die Bestimmung einer minimal erforderlichen Betriebsspannung verbunden mit der Ansteuerung des gemeinsamen Spannungsreglers. Ausgangspunkt ist dabei die Ermittlung der für jede einzelne LED-Kette im bestromten Zustand der LEDs minimal erforderlichen Betriebsspannung.Of the inventive idea of the solution in The features of claim 1 and claim 6 lies in the minimization that of the semiconductor devices in the parallel-connected LED strings generated total power loss. This task is solved by the determination of a minimum required operating voltage associated with the control of the common voltage regulator. starting point is the determination of the for every single LED chain in the energized state of the LEDs minimally required Operating voltage.
Die Schaltungsanordnung weist daher eine Reglereinheit auf, der als Eingangssignale über den jeweiligen Stromquellen der einzelnen LED-Ketten gemessene Spannungswerte zugeführt werden. Als resultierendes Ausgangssignal der Spannungsregelung gibt die Reglereinheit ein Steuersignal an den steuerbaren Spannungsregler aus.The Circuitry therefore has a regulator unit, which as Input signals via voltage values measured according to the respective current sources of the individual LED chains supplied become. As the resulting output signal of the voltage regulation the controller unit sends a control signal to the controllable voltage regulator out.
Zweckmäßigerweise
umfasst die Reglereinheit die folgenden Funktionsblöcke:
eine
Messeinheit zur Messung der Spannungswerte über den Stromquellen,
eine
Auswerteeinheit, die die gemessenen Spannungswerte verarbeitet und
ein Ausgangssignal bereitstellt,
einen Regler, der eingangsseitig
mit dem Ausgangssignal der Auswerteeinheit und einem Sollwert-Eingangssignal
verbunden ist und ein Reglerausgangssignal ausgibt,
eine Kontrolleinheit,
die aus dem Reglerausgangssignal ein Steuersignal für den steuerbaren
Spannungsregler erzeugt.Conveniently, the controller unit comprises the following functional blocks:
a measuring unit for measuring the voltage values across the power sources,
an evaluation unit that processes the measured voltage values and provides an output signal,
a controller which is connected on the input side to the output signal of the evaluation unit and a setpoint input signal and outputs a controller output signal,
a control unit which generates a control signal for the controllable voltage regulator from the regulator output signal.
Mit der erfindungsgemäßen Schaltungsanordnung wird ein ebenfalls erfindungsgemäßes Verfahren realisiert, das darauf beruht, dass für einen verlustleistungsoptimierten Betrieb der Schaltungsanordnung die minimal erforderliche Betriebsspannung bestimmt wird. Die Bestimmung erfolgt derart, dass zunächst im bestromten Zustand der LEDs die Spannungswerte über den Stromquellen der jeweiligen LED-Kette gemessen werden. Die weitere Verarbeitung der über den Stromquellen gemessenen Spannungswerte geschieht in einer Verarbeitungseinheit erfindungsgemäß in der Weise, dass die kleinste dieser Spannungen bestimmt wird. Dabei kann die Verarbeitungseinheit zur Ermittlung des kleinsten Spannungswertes als Hardware-Schaltung oder in vorteilhafter Weise flexibel als Software-Programm auf einem Mikroprozessor ausgeführt sein. Anschließend wird aus der kleinsten Spannung und einem zugeführten Spannungsregler-Sollwert ein Reglerausgangssignal abgeleitet und schließlich wird das Reglerausgangssignal in ein Steuersignal für den steuerbaren Spannungsregler zur Einstellung der minimal erforderlichen Betriebsspannung transformiert.With the circuit arrangement according to the invention is a likewise inventive method realized, which is based on that for a loss-performance-optimized Operation of the circuit arrangement, the minimum required operating voltage is determined. The determination is made such that initially in energized state of the LEDs the voltage values across the current sources of the respective LED chain can be measured. Further processing of the over Current sources measured voltage values happens in a processing unit According to the invention in the Way that the smallest of these voltages is determined. It can the processing unit for determining the smallest voltage value as a hardware circuit or advantageously as flexible Software program to run on a microprocessor. Subsequently, will from the lowest voltage and a supplied voltage regulator setpoint a controller output signal is derived and finally the controller output signal in a control signal for the controllable voltage regulator for setting the minimum required Operating voltage transformed.
Mit der Erfindung wird somit erreicht, dass nur die minimal benötigte Betriebsspannung über der Parallelschaltung der LED-Ketten anliegt, also auch nur eine minimale Verlustleistung entsteht, die wiederum zu einer geringeren Wärmeentwicklung führt.With The invention is thus achieved that only the minimum required operating voltage across the parallel circuit the LED chains is applied, so only a minimal power loss arises, which in turn leads to less heat.
Hieraus ergeben sich erhebliche Vorteile hinsichtlich des erforderlichen Platzbedarfs. Wenn überhaupt notwendig, werden nur sehr kleine Kühlkörper benötigt, sodass auf den Einsatz von Zwangskonvektion verzichtet werden kann. Insgesamt gesehen bietet also die Erfindung durch die Bereitstellung einsetzbarer Display-Gehäuse mit kleinen Abmessungen mehr Freiheitsgrade beim Verbau und damit bei der Gestaltung der Einbauumgebung.This results in considerable advantages in terms of the required space. If necessary, only very small heat sinks needed so that the use of forced convection can be dispensed with. Overall, therefore, the invention provides by providing usable display housing with small dimensions more degrees of freedom in the installation and thus in the design of the installation environment.
Als weiterer Vorteil kann auf kostengünstige Standardbauelemente zurückgegriffen werden, die eine aufwändige Selektion der Bauelemente entbehrlich machen.When Another advantage can be on inexpensive standard components resorted be that elaborate Make selection of the components dispensable.
Weitere zweckmäßige Ausgestaltungsmerkmale werden an Hand eines bevorzugten, in der Zeichnung veranschaulichten Ausführungsbeispiels erläutert. Dabei zeigt die Figur ein Prinzipschaltbild der erfindungsgemäßen Schaltungsanordnung.Further expedient design features are based on a preferred, illustrated in the drawing Embodiment explained. there the figure shows a schematic diagram of the circuit arrangement according to the invention.
Die
Schaltung besteht aus n parallel geschalteten LED-Ketten
Aus
dem Prinzipschaltbild geht hervor, dass einer Reglereinheit
Die
Reglereinheit
Auch
eröffnet
das erfindungsgemäße Verfahren
und dessen Implementierung in der erfindungsgemäßen Schaltungsanordnung die
Möglichkeit,
durch Auswertung der gemessenen Spannungswerte U1 bis
Un kurzgeschlossene oder unterbrochene LED-Ketten
Claims (10)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007045777A DE102007045777A1 (en) | 2007-09-25 | 2007-09-25 | Scalable LED control with minimized power loss |
PCT/EP2008/062509 WO2009040305A1 (en) | 2007-09-25 | 2008-09-19 | Scalable led driving with minimized power loss |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007045777A DE102007045777A1 (en) | 2007-09-25 | 2007-09-25 | Scalable LED control with minimized power loss |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102007045777A1 true DE102007045777A1 (en) | 2009-04-09 |
Family
ID=40019468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102007045777A Ceased DE102007045777A1 (en) | 2007-09-25 | 2007-09-25 | Scalable LED control with minimized power loss |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102007045777A1 (en) |
WO (1) | WO2009040305A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010015088A1 (en) * | 2010-03-19 | 2011-09-22 | Dilitronics Gmbh | Power dissipation reduction circuit arrangement for linear current driver of LED utilized in e.g. optical system, has driver stage whose output is connected with LEDs, where power supply voltage of each LED is adjusted by varying variable |
DE102017213916A1 (en) * | 2017-08-10 | 2019-02-14 | Osram Gmbh | Supplying a light source with electrical energy from an electrical energy source |
DE102017215753A1 (en) * | 2017-09-07 | 2019-03-07 | Osram Gmbh | SUPPLY ELECTRIC POWER FROM A ELECTRIC ENERGY SOURCE |
Families Citing this family (4)
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DE102009018098A1 (en) | 2009-04-20 | 2010-10-21 | Austriamicrosystems Ag | Charging circuit for a charge storage and method for loading such |
US8492987B2 (en) | 2009-10-07 | 2013-07-23 | Lutron Electronics Co., Inc. | Load control device for a light-emitting diode light source |
BR112013009250A2 (en) * | 2010-10-19 | 2020-10-06 | Koninklijke Philips Electronics N.V | led circuit layout, led light source for operation in a led circuit layout and method for operating a led light source connected by a ration element with a dc operating voltage |
US8680787B2 (en) * | 2011-03-15 | 2014-03-25 | Lutron Electronics Co., Inc. | Load control device for a light-emitting diode light source |
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DE102010015088A1 (en) * | 2010-03-19 | 2011-09-22 | Dilitronics Gmbh | Power dissipation reduction circuit arrangement for linear current driver of LED utilized in e.g. optical system, has driver stage whose output is connected with LEDs, where power supply voltage of each LED is adjusted by varying variable |
DE102017213916A1 (en) * | 2017-08-10 | 2019-02-14 | Osram Gmbh | Supplying a light source with electrical energy from an electrical energy source |
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Also Published As
Publication number | Publication date |
---|---|
WO2009040305A1 (en) | 2009-04-02 |
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Effective date: 20120727 |