EP3032920A2 - Procede et circuit d'alimentation d'un systeme d'eclairage a del - Google Patents

Procede et circuit d'alimentation d'un systeme d'eclairage a del Download PDF

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Publication number
EP3032920A2
EP3032920A2 EP15199590.9A EP15199590A EP3032920A2 EP 3032920 A2 EP3032920 A2 EP 3032920A2 EP 15199590 A EP15199590 A EP 15199590A EP 3032920 A2 EP3032920 A2 EP 3032920A2
Authority
EP
European Patent Office
Prior art keywords
led
temperature
determined
operating time
dependent
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.)
Granted
Application number
EP15199590.9A
Other languages
German (de)
English (en)
Other versions
EP3032920A3 (fr
EP3032920B1 (fr
Inventor
Julia Pölzl
Markus Rhein
Bernhard Wuppinger
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.)
Osram SBT GmbH
Original Assignee
Siteco Beleuchtungstechnik GmbH
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Filing date
Publication date
Application filed by Siteco Beleuchtungstechnik GmbH filed Critical Siteco Beleuchtungstechnik GmbH
Publication of EP3032920A2 publication Critical patent/EP3032920A2/fr
Publication of EP3032920A3 publication Critical patent/EP3032920A3/fr
Application granted granted Critical
Publication of EP3032920B1 publication Critical patent/EP3032920B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/18—Controlling the intensity of the light using temperature feedback

Definitions

  • the present invention relates to a circuit and a method for controlling a lamp, which has at least one LED as a lighting means.
  • LEDs which are also understood to mean OLEDs, because these lamps are energy-saving and have a long service life.
  • a disadvantage of the LED bulbs is that the luminous flux emitted by the LED can vary with constant supply current due to various factors. As a result, in the case of a constant current supply of the LEDs, it is not ensured that a constant luminous flux is also emitted by the luminaire.
  • a circuit for powering a lamp with at least one LED is described as a light source, which already takes into account the temperature-dependent change in the luminous flux due to a changing ambient temperature or LED temperature.
  • a lower current is provided to the LED than in a second higher temperature interval.
  • the temperature has a very large influence on the variation of the luminous flux with constant supply current, however, the correction alone by the currently measured temperature is not satisfactory, because it despite the readjustment of the current with different models, as described for example in the cited prior art , may still be under or over correction.
  • Object of the present invention is to provide a circuit and a method for operating a lamp with at least one LED as a light source, which or which allows a more precise automatic control of the supply current for generating a constant luminous flux of the LED light.
  • the object is achieved by a circuit according to claim 1 or by a method according to claim 7.
  • the circuit for driving the LED light provides two controlled variables, which are used together to compensate for the change in the luminous flux.
  • the current temperature in the environment or on the LED itself is measured in order to adjust the supply current.
  • the supply current at low temperature will be lower than the supply current at a higher temperature to obtain an approximately constant luminous flux.
  • a second controlled variable is taken into account, which depends on the operating time of the LED. This compensates for aging-related effects that also affect the luminous flux of the LED. Although these are generally smaller than the changes in luminous flux directly caused by temperature fluctuations.
  • a regulation in which only the current temperature value is received would regularly lead to over- or under-compensation depending on how the LED has been operated up to the current time.
  • the parameter dependent on the operating time of the LED may include the total time that the LED has been in operation up to the present time.
  • the operating time of the LED may be continuously stored and the total time that the LED was in operation may be retrieved from the memory at any time to adjust the parameter.
  • the parameter dependent on the operating time of the LED is weighted with temperature values, the temperature values corresponding to periods in which the LED was in operation. It has been found that depending on the ambient or operating temperature of the LED, the aging effect varies over a given time. The consideration of only the total operating time of the LED can therefore lead to an inaccurate result if the LED has been operated regularly at higher or lower average temperatures. To compensate for this effect, the temperature values within which the LED was in operation are taken into account for determining the parameter. Furthermore, temperature values of periods in which the LED was switched off can also be taken into account. The influence of the temperatures on the aging characteristic of the LED in the switched on / off state can be determined empirically in order to adjust the parameters dependent on the operating time of the LED.
  • the weighting of the parameter dependent on the operating time of the LED with temperature values can be effected by temperature values which are determined from stored data of the measured temperature sensor. Alternatively or additionally, however, it may also be provided to determine the temperature values from statistical data.
  • the statistical data are collected from the number of years, the seasons and / or the times of day in which the LED was in operation. For example, different statistical temperature values for the different seasons and for the daytime and nighttime operation of the LED can be set. From the statistical data, which can be determined in particular also location-dependent, it can then be determined to which ambient temperatures the LED was exposed during operation. Furthermore, the temperatures may also be considered in periods when the LED was not in operation but was still exposed to ambient temperatures.
  • a preferred embodiment also provides that the determination of the parameter dependent on the operating time of the LED also takes into account a temporal integral of the supply current through the LED over its operating duration. It has been found that the aging of an LED varies depending on the level of supply current that has been implemented by the LED in the past. In order to take this effect into account, the supply current over the total operating time of the LED is integrated in time to empirically adjust the dependent of the operating time of the LED parameters.
  • the adjustment of the supply current of the LED follows by adding two correction values to a constant current, the first correction value being determined by the temperature currently measured by the temperature sensor and the second correction value being defined by the parameter determined as a function of the operating time of the LED , It is to be understood that the correction values are determined empirically by a characteristic curve, wherein in the first correction value only the current temperature is received as a variable variable and in the second correction value only the parameter dependent on the operating time of the LED is received.
  • the operating time dependent parameter may, as previously described, include the quantities determined from the total operating time, the historical temperature values and / or the time integrated supply current of the LED.
  • a temperature T S is measured at a current time x, which is exposed to the LED. This may be the ambient temperature of the LED, which is measured near the LED, eg on an LED module. Accordingly in the FIG. 2 dependency I (T S ) can be determined, which supply current I for the LED at the temperature T S is necessary to a luminous flux, which corresponds to a lumen maintenance value of 100%, must be applied to the LED. At temperatures below a reference temperature of eg 50 ° C, lower currents are required (see area below T ref in FIG.
  • the example in the Figures 1 and 2 does not take into account the natural aging to which the LED is subjected.
  • the operation of the LED reduces the efficiency of the LED, ie, given a given supply current I and a given temperature T S of the LED, over time the luminous flux released by the LED under these conditions decreases.
  • the invention provides a more precise determination of the aging history of the LED in order to actually achieve a constant lumen maintenance value in the tracking of the luminous flux.
  • FIG. 5 An example is in the FIG. 5 shown.
  • the actual aging of the LED (lower lines of the FIG. 5 ) is subject to the history of which the LED has been in operation since the rebuild. On the one hand, the total operating time of the LED is on.
  • the aging of the LED ie the decrease in the efficiency of the LED, increases with time. Furthermore, however, the temperatures that the LED was exposed to when it was switched on or off are also taken into account.
  • the aging characteristic that the aging of the LED is lower in the winter months than in the summer months. It can also be seen that the aging of the LED is less at night than during the day (spikes in the aging line).
  • a tracking of the supply current of the LED can be calculated so that a lumen maintenance value of 100% is achieved.
  • FIG. 4 illustrates an embodiment of a method for calculating the supply current I LED for an LED according to an embodiment of the invention such that, as in FIG. 5 shown, a desired brightness value, the lumen maintenance value of 100% in the FIG. 5 corresponds, is achieved.
  • an electrical LED supply current I A for reaching the setpoint brightness at reference conditions, ie at a constant temperature, is determined.
  • a luminous flux change ⁇ A is calculated from a currently measured temperature of the LED ⁇ LED on the basis of the LED temperature ⁇ LED deviating from the reference temperature. This results in a correction current ⁇ I ( ⁇ A ) which is added to the current I A to produce an LED current I B which is corrected for the current LED temperature ⁇ LED .
  • a correction is made with respect to the temperature-induced aging of the LED.
  • a temporal integral over the LED temperatures over the past of the LED is formed and used to determine the luminous flux change ⁇ B due to the temperature-induced aging of the LED.
  • the corresponding current correction value ⁇ I ( ⁇ B ) is determined and added to the value I B.
  • the result is an LED current I C that is corrected for the temperature-induced aging of the LED.
  • the luminous flux change ⁇ C is determined on the basis of the current-related aging of the LED and from this the corresponding correction current ⁇ I ( ⁇ C ) is determined.
  • the correction current .DELTA.I ( ⁇ C) is added to the LED current I C to obtain an electrical LED current I LED, is corrected for the current-induced aging of the LED.
  • This calculation can be performed, for example, by a software that is integrated in a control device of a circuit for operating the LED.
  • the circuit also has an interface to measure the LED temperature ⁇ LED with a sensor.
  • the sensor is located near the LED, in particular on an LED module itself. In particular, the measurement of the temperature can take place cyclically, so that current actual temperature values at the time x are available for the calculation of the correction values of the LED current.
  • the above-described method for calculating the supply current I LED may vary without departing from the subject matter of the invention, which is defined by the claims.
  • changes in the calculation of the parameter caused by the operation of the LED ie in the preceding example the sum of the luminous flux change due to the temperature-induced aging of the LED and due to the current-related aging of the LED, can be made.
  • the temperature-induced change in the LED can be determined on the basis of an integral via actually measured temperature values or on the basis of statistical values which have been determined in particular taking into account the location of use of the LED.
  • the current-related aging of the LED can be determined from an integral of the actual supply current through the LED.
  • average values may be used that take into account an average operating time of the LED up to the current time of control. For example, it can be assumed that the LED has been operated on average for a certain time per day, eg six hours.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP15199590.9A 2014-12-11 2015-12-11 Procede et circuit d'alimentation d'un systeme d'eclairage a del Active EP3032920B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014118440.8A DE102014118440A1 (de) 2014-12-11 2014-12-11 Verfahren und Schaltung zur Versorgung eines LED-Leuchtmittels

Publications (3)

Publication Number Publication Date
EP3032920A2 true EP3032920A2 (fr) 2016-06-15
EP3032920A3 EP3032920A3 (fr) 2016-07-06
EP3032920B1 EP3032920B1 (fr) 2017-07-19

Family

ID=54979392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15199590.9A Active EP3032920B1 (fr) 2014-12-11 2015-12-11 Procede et circuit d'alimentation d'un systeme d'eclairage a del

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EP (1) EP3032920B1 (fr)
DE (1) DE102014118440A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017105131A1 (de) 2017-03-10 2018-09-13 Osram Opto Semiconductors Gmbh Verfahren zum Betreiben eines optoelektronischen Bauelements und optoelektronisches Bauelement
DE102017130862A1 (de) * 2017-12-21 2019-06-27 Helge Hoffmann Scheinwerfer
DE102018100598A1 (de) * 2018-01-12 2019-07-18 Osram Opto Semiconductors Gmbh Verfahren zum steuern eines stromes einer leuchtdiode
DE102018127796A1 (de) * 2018-11-07 2020-05-07 Rational Aktiengesellschaft Gargerät sowie Verfahren zum Betreiben eines Gargeräts

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355621A2 (fr) 2010-02-05 2011-08-10 Siteco Beleuchtungstechnik GmbH Compensation de température du flux lumineux sur des lampes à DEL

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783909A (en) * 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
US6414661B1 (en) * 2000-02-22 2002-07-02 Sarnoff Corporation Method and apparatus for calibrating display devices and automatically compensating for loss in their efficiency over time
US7262752B2 (en) * 2001-01-16 2007-08-28 Visteon Global Technologies, Inc. Series led backlight control circuit
US6689999B2 (en) * 2001-06-01 2004-02-10 Schott-Fostec, Llc Illumination apparatus utilizing light emitting diodes
US7132805B2 (en) * 2004-08-09 2006-11-07 Dialight Corporation Intelligent drive circuit for a light emitting diode (LED) light engine
DE202005020801U1 (de) * 2005-02-25 2006-09-14 Erco Leuchten Gmbh Leuchte
US8274361B2 (en) * 2006-01-25 2012-09-25 Koninklijke Philips Electronics N.V. Control device for selecting the color of light emitted by a light source
DE102010005743A1 (de) * 2009-07-09 2011-01-13 Siteco Beleuchtungstechnik Gmbh LED-Ansteuerung
EP2607238B1 (fr) * 2011-12-19 2014-08-20 Goodrich Lighting Systems GmbH Phare d'avion anti-collision
DE102012219876A1 (de) * 2012-10-30 2014-04-30 Osram Gmbh Kalibrieren einer leuchtvorrichtung mit einer halbleiterlichtquelle
DE102013207525A1 (de) * 2013-04-25 2014-10-30 Zumtobel Lighting Gmbh Verfahren und Schaltungsanordnung zum Betreiben einer LED-Lichtquelle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355621A2 (fr) 2010-02-05 2011-08-10 Siteco Beleuchtungstechnik GmbH Compensation de température du flux lumineux sur des lampes à DEL

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EP3032920A3 (fr) 2016-07-06
EP3032920B1 (fr) 2017-07-19
DE102014118440A1 (de) 2016-06-16

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