EP2989857A1 - Verfahren und schaltungsanordnung zum betreiben einer led-lichtquelle - Google Patents
Verfahren und schaltungsanordnung zum betreiben einer led-lichtquelleInfo
- Publication number
- EP2989857A1 EP2989857A1 EP14719302.3A EP14719302A EP2989857A1 EP 2989857 A1 EP2989857 A1 EP 2989857A1 EP 14719302 A EP14719302 A EP 14719302A EP 2989857 A1 EP2989857 A1 EP 2989857A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light source
- led light
- led
- factor
- determined
- 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
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]
- H05B45/10—Controlling the intensity of the light
- H05B45/18—Controlling the intensity of the light using temperature feedback
-
- 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
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
Definitions
- the present invention relates to a method for operating an LED light source, with the help of aging phenomena of the LED can be compensated during operation in order to ensure a constant light output permanently. Furthermore, the invention relates to a corresponding circuit arrangement for carrying out the method.
- luminaires or LED-based light sources have a limited service life of typically approximately 50,000 operating hours. It is assumed that, after these 50,000 hours of operation, the light output would be below a threshold value below 70%, for example - a limit value of e.g. 80% or 90%> - of the original value.
- the simplest variant is to make no compensation when controlling the LEDs, which takes into account the light fall.
- the lighting is planned from the beginning so that the light output at the beginning of the commissioning of the lamp has a certain surplus and only at the end of the above life, the light output has dropped to a value corresponding to the actual desired lighting. That is, most of the time, the light source is operated oversized, such that it emits too much light, which obviously results in reduced efficiency. However, this is still the most prevalent way of doing it
- luminaires are also known in which the light output is detected directly by a sensor and the light sources are then controlled in such a way in the context of a regulation that a constant light output is achieved.
- this approach is relatively expensive due to the sensor and a required optical system, with the help of which light is directed in a reliable manner to the sensor and thereby influences the outside light can be eliminated.
- a corresponding brightness sensor
- a third known procedure is based on the fact that, on the basis of statistical measurements and theoretical models, the decrease in brightness over time is determined. Based on these calculations, the light sources are then increasingly operated at increased power to counteract this effect.
- these are theoretical models many factors that influence the aging process - for example, temperature, humidity, parameters during operation, and so on - can not be taken into account, so that this procedure is also subject to a not inconsiderable inaccuracy ,
- Light output of an LED depends on its operating temperature. As mentioned, however, this is not an aging effect, so that this variant is not taken into account.
- the present invention is therefore the object of the present invention to remedy this situation and thereby optimize the operation of LED light sources.
- the object is achieved by a method for operating an LED light source with the features of claim 1 and by a circuit arrangement for operating an LED light source according to claim 7.
- a method for operating an LED light source is proposed, it being determined on the basis of temperature measurements - preferably at two or more locations - which portion of the LED light source supplied during operation electrical power is converted into light and based on this the aging of the LED light source compensating compensation factor is determined, wherein for determining the proportion of converted into light electric power, a correlation factor is taken into account, which was determined at the start of commissioning of the lamp.
- an arrangement for operating an LED light source is proposed with a converter which is adapted to implement input power supplied to an LED power source supplied to the output power, and a control unit for driving the converter, which is adapted to on the basis of temperature measurements determining what proportion of the electrical power supplied to the LED light source from the converter is converted to light and based thereon determining a compensation factor compensating the aging of the LED light source, wherein the control unit for determining the proportion of electrical power converted to light has a correlation factor which was determined at the beginning of commissioning of the luminaire.
- the solution according to the invention is based on the fact that a waste in the
- the circuit arrangement according to the invention is for Operating the light source designed to determine the proportions in which the supplied energy is converted into light or heat. Based on this, a compensation factor can then be determined, which is taken into account when supplying the power to the LEDs in order to compensate for the aging effect. This requires that the heat flow from the luminaire is monitored and at the same time it is known which power is supplied to the luminaire and transmitted to the LEDs by the operating device or the circuit arrangement.
- the operating device by means of which the energy provided by the general power supply is converted into a supply current for the LEDs, also placed within the lamp, and this operating device can lead to certain losses, which affect the heat flow.
- a sensor is preferably arranged in the immediate vicinity of the LEDs or the light engine, whereas the other sensor is arranged at a position spaced apart from it within the luminaire.
- the circuit arrangement accesses information that is determined prior to commissioning and at the beginning of the commissioning of the luminaire. For example, information that provides information about the efficiency with which the LEDs operate is initially taken into account
- Temperatures that convert their supplied electrical power into light are reference measurements that describe the basic properties of the LEDs and can be performed centrally, eg with a limited number of luminaires in the laboratory or immediately after their production. However, for the question of which heat loss can occur during the operation of the luminaire, its actual installation situation during later operation can also be significant. It is therefore additionally provided that, in the context of a self-calibration at the beginning of commissioning, the luminaire performs further measurements which relate to the temperature behavior of the luminaire in the operating state. During these measurements, it can be assumed that here - since the measurements are made at the beginning of the luminaire operation and the time duration
- Circuit arrangement calculate how high the proportion of the power is, which is converted into heat. These measurements also take into account possibly existing influences such as losses of the operating device and the like. A correlation factor obtained in this way is then stored in a memory.
- FIG. 1 shows schematically a luminaire with an LED light source in which the method according to the invention is to be used.
- the representation in FIG. 1 is to be understood purely diagrammatically, wherein in particular the representation of optical elements which influence the light output has been dispensed with.
- the luminaire generally designated by the reference numeral 100, has, as already mentioned, an LED light source 1 which is arranged on a corresponding board 2.
- a heat sink 5 At the back of the board 2 is a heat sink 5, to be efficiently dissipated via the occurring during operation of the lamp 100 heat loss.
- the required for determining the light output temperature measurements are carried out with the help of two or more temperature sensors, in the present example, a first temperature sensor 3 as close to the LED 1 and on the board 2 is arranged, while the second temperature sensor 4 in one of them more distant position is arranged.
- a first temperature sensor 3 as close to the LED 1 and on the board 2 is arranged, while the second temperature sensor 4 in one of them more distant position is arranged.
- the second temperature sensor 4 is arranged on the heat sink 5.
- the lamp 100 is an input power Pi n supplied, which is converted by a converter 7 in a corresponding output power P out .
- This P out output power is supplied to the light source, that is, there is a corresponding connection between the converter and printed circuit board 2 with the LED 1 arranged thereon.
- the driving of the converter 7 takes place here via a lighting control unit 6, which is responsible for ensuring operation with uniform light output over the entire lifetime. In the present case, it is assumed that under constant light output always a constant light output, for example at maximum brightness
- non-volatile memory 12 in which the
- the control unit 6 can access this memory 12 to the
- the loss of heat Pheat can be due both to losses in the converter 7 and to losses in the LED 1 and the light engine.
- the LED 1 converts power supplied to light at the beginning of its service life.
- Piight nLED-f (TL1) -Pout (2)
- Piight corresponds to the output light output and Pout, as already mentioned, represents the power supplied by the converter 7 to the LED.
- Tu is the temperature at the location of the first sensor 3, and T
- Parametrianssphase first at a reference temperature depending on the power supplied to the LED 1 Pout the light power Piight determined and thus the efficiency factor T
- these initial measurements can be made on a few luminaires immediately after their manufacture.
- the measurement results are to be considered independent of the actual location of use of the lamp so that they can be carried out so to speak centrally and then stored in the memory.
- a second measuring phase is required after installation of the luminaire 100 at the beginning of operation. This so-called self-calibration serves to effects in the
- TLED TL! + Pheat-RtllLED-Ll (3)
- TLED TL2 + Pheat-RtllLED-L2 (4), the proportion of power that is converted into heat can be described as follows:
- Pheat (TU - TL2) / (RtllLED-L2 - RtllLED-Ll) (5)
- Pheat F ⁇ (TU - TL2) (6)
- T LED here represents the temperature of the LED itself, where T L1 and T L 2 the
- RthLED-Li and RthLED L2 each describe the thermal resistance between the LED and the location of the LED Sensor 3 and the second sensor 4. F is finally the
- Control unit 6 available.
- T AGED LED (Pin - F ⁇ (TLI - TL2 »/ (f (TLI) - Pout) (9) Obviously, since all the parameters on the right side of the equation are known or can be measured, now the reduced one Efficiency T AGED LED of the LED 1 can in turn be determined in a simple way by temperature measurements, which makes it possible to determine a compensation factor KAGE COMPENSATION for compensating the aging phenomena on the basis of the following equation, wherein the control unit 6 then has to control the converter 7 in a simple manner such that the output power P ou t is increased by this compensation factor.
- BEAM COMPENSATION T
- this procedure primarily takes into account the aging of the LED.
- the temperature dependence in the light output could also be taken into account, which - as already mentioned - is independent of the aging.
- a second compensation factor is introduced, which is calculated as follows.
- KTEMP COMPENSATION f (TLl_REF) / f (TLl)
- Tl f
- the procedure according to the invention is advantageous insofar as temperature effects, which may result from the installation situation of the luminaire, are also taken into account.
- a further self-calibration is carried out to determine the new correlation factor based on the last-determined LED efficiency.
- recalibration can be performed automatically by the luminaire or by means of a switch or by the Transmission of a corresponding control command, for example in the form of a DALI command - be initiated.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013207525.1A DE102013207525A1 (de) | 2013-04-25 | 2013-04-25 | Verfahren und Schaltungsanordnung zum Betreiben einer LED-Lichtquelle |
| PCT/EP2014/058224 WO2014173940A1 (de) | 2013-04-25 | 2014-04-23 | Verfahren und schaltungsanordnung zum betreiben einer led-lichtquelle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2989857A1 true EP2989857A1 (de) | 2016-03-02 |
| EP2989857B1 EP2989857B1 (de) | 2018-01-10 |
Family
ID=50549325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14719302.3A Active EP2989857B1 (de) | 2013-04-25 | 2014-04-23 | Verfahren und schaltungsanordnung zum betreiben einer led-lichtquelle |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9468067B2 (de) |
| EP (1) | EP2989857B1 (de) |
| CN (1) | CN105103656B (de) |
| DE (1) | DE102013207525A1 (de) |
| WO (1) | WO2014173940A1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014118440A1 (de) * | 2014-12-11 | 2016-06-16 | Siteco Beleuchtungstechnik Gmbh | Verfahren und Schaltung zur Versorgung eines LED-Leuchtmittels |
| DE102016207725A1 (de) | 2016-05-04 | 2017-11-09 | Bayerische Motoren Werke Aktiengesellschaft | Beleuchtungsvorrichtung |
| DE102018100598A1 (de) * | 2018-01-12 | 2019-07-18 | Osram Opto Semiconductors Gmbh | Verfahren zum steuern eines stromes einer leuchtdiode |
| US11071178B2 (en) | 2018-07-16 | 2021-07-20 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED lighting system, apparatus, and dimming method |
| US11191136B2 (en) | 2018-07-16 | 2021-11-30 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED lighting system, apparatus, and dimming method |
| US12513794B2 (en) | 2018-07-16 | 2025-12-30 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | Light-emitting diode lamp illumination system, and dimmer and light-emitting diode lamp thereof |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7132805B2 (en) * | 2004-08-09 | 2006-11-07 | Dialight Corporation | Intelligent drive circuit for a light emitting diode (LED) light engine |
| US20060226956A1 (en) * | 2005-04-07 | 2006-10-12 | Dialight Corporation | LED assembly with a communication protocol for LED light engines |
| WO2007046026A1 (en) * | 2005-10-19 | 2007-04-26 | Philips Intellectual Property & Standards Gmbh | A color lighting device |
| KR100662998B1 (ko) * | 2005-11-04 | 2006-12-28 | 삼성에스디아이 주식회사 | 유기 전계발광 표시장치 및 그 구동방법 |
| US20080062070A1 (en) * | 2006-09-13 | 2008-03-13 | Honeywell International Inc. | Led brightness compensation system and method |
| US20080258637A1 (en) * | 2007-04-20 | 2008-10-23 | Shun Kei Leung | Light emitting element driver and control method therefor |
| WO2009044340A2 (en) * | 2007-10-02 | 2009-04-09 | Nxp B.V. | Method and circuit arrangement for determining the light output level of a led |
| DE102007059130A1 (de) * | 2007-12-07 | 2009-06-10 | Osram Gesellschaft mit beschränkter Haftung | Verfahren und Anordnung zur Einstellung eines Farborts sowie Leuchtsystem |
| US8896317B2 (en) * | 2008-02-15 | 2014-11-25 | Nxp B.V. | Lighting unit with compensation for output frequency, and method for determining output frequency |
| US20120013252A1 (en) * | 2008-09-24 | 2012-01-19 | B/E Aerospace, Inc. | Aircraft led washlight system and method for controlling same |
| DE102008064149A1 (de) * | 2008-12-19 | 2010-07-01 | Osram Opto Semiconductors Gmbh | Optoelektronische Vorrichtung |
| EP2242333A1 (de) * | 2009-02-27 | 2010-10-20 | Osram Gesellschaft mit Beschränkter Haftung | Verfahren zur Kompensation der Alterung von einem LED und zugehörige Vorrichtung |
| EP2296436B1 (de) * | 2009-09-07 | 2018-11-14 | Nxp B.V. | System und Verfahren zur Messung des Lichtstromes einer lichtemittierenden Diode |
| US9192008B2 (en) * | 2012-03-26 | 2015-11-17 | B/E Aerospace, Inc. | Reduced-size modular LED washlight component |
-
2013
- 2013-04-25 DE DE102013207525.1A patent/DE102013207525A1/de not_active Withdrawn
-
2014
- 2014-04-23 CN CN201480019174.0A patent/CN105103656B/zh not_active Expired - Fee Related
- 2014-04-23 EP EP14719302.3A patent/EP2989857B1/de active Active
- 2014-04-23 US US14/783,855 patent/US9468067B2/en not_active Expired - Fee Related
- 2014-04-23 WO PCT/EP2014/058224 patent/WO2014173940A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014173940A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102013207525A1 (de) | 2014-10-30 |
| EP2989857B1 (de) | 2018-01-10 |
| CN105103656B (zh) | 2018-02-23 |
| US9468067B2 (en) | 2016-10-11 |
| WO2014173940A1 (de) | 2014-10-30 |
| CN105103656A (zh) | 2015-11-25 |
| US20160066385A1 (en) | 2016-03-03 |
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