EP2412206A1 - Dimmbares betriebsgerät und beleuchtungssystem zur erhöhung der lebenserwartung bei leds und oleds - Google Patents
Dimmbares betriebsgerät und beleuchtungssystem zur erhöhung der lebenserwartung bei leds und oledsInfo
- Publication number
- EP2412206A1 EP2412206A1 EP10711056A EP10711056A EP2412206A1 EP 2412206 A1 EP2412206 A1 EP 2412206A1 EP 10711056 A EP10711056 A EP 10711056A EP 10711056 A EP10711056 A EP 10711056A EP 2412206 A1 EP2412206 A1 EP 2412206A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- operating
- operating device
- predetermined level
- oled
- 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
- 230000015654 memory Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000006978 adaptation Effects 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000002123 temporal effect Effects 0.000 claims description 2
- 230000006870 function Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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
- H05B45/12—Controlling the intensity of the light using optical feedback
Definitions
- the present invention relates to a
- a supply current for example, supplied from the mains, must be adjusted so that it corresponds to the operating characteristics of the LED.
- US 7138 970 B2 shows a method for operating an LED lighting system within a
- Line scan camera comprising an LED and a light sensor.
- the LED operates at pulse rate modulation at less than 100% duty cycle to reduce LED aging and increase life expectancy.
- the light sensor is set to a higher sensitivity. After the brightness of the LED decreases during operation, the duty cycle is gradually increased to 100%.
- US 6236 331 Bl shows an electronic control device for an LED traffic light.
- the control circuit ensures a constant luminous intensity of the traffic light, which complies with the legal requirements and is below the maximum possible brightness of the LEDs. Constant brightness is achieved by a light sensor that measures the brightness of a separate LED. If necessary, the brightness is readjusted by the control unit. As a result, the life expectancy of the LEDs is increased and the traffic light can longer comply with the legal standard.
- the lamp is set to maximum brightness and set to lower brightness during dusk and night. The Ambient brightness is detected via another light sensor.
- the invention addresses this problem and provides a solution to how the operating characteristics of LEDs become more consistent and adaptable.
- an operating device is designed so that it can operate at least one LED or OLED. It has a control electronics for adjusting a
- the operating device restricts the
- the operating device ignores an incoming external dimming command or converts it, for example, by scaling down so that the LED or OLED power does not exceed the predetermined level in the first operating phase.
- incoming dimensional commands xn of this time are xgnorxert and dxe OLED is operated with a predetermined current or a current in a predetermined current corridor. Within the corridor, incoming dimming commands can optionally be implemented.
- the predetermined level is below the maximum allowable power supply of the at least one LED. This ensures that the maximum possible light intensity of the LED is deliberately prevented during a first operation.
- the invention further provides that the predetermined level changes over the operating time in the first operating phase of the at least one LED in such a way that it approaches the maximum permissible power supply.
- the first phase of operation is terminated when the predetermined level has reached the maximum allowable power supply.
- the predetermined level changes over the operating time of the first operating phase of the at least one LED so that the light intensity of the at least one LED remains constant.
- the predetermined level may linearly increase over the operating time in one embodiment.
- the predetermined level may increase logarithmically in a further embodiment over the operating time.
- the predetermined level may increase over the operating time but also following any other non-linear curve.
- the invention relates to an operating hours counter, by means of which the change of the predetermined level is regulated as a function of the operating time.
- the invention also relates to a memory, such as a One Time Programmable Memory, which specifies the temporal change of the predetermined level.
- the invention may comprise a measuring device, preferably a light sensor, which detects the light intensity of the at least one LED when operating at the power of the predetermined level and supplies the measured values to the control unit.
- a measuring device preferably a light sensor, which detects the light intensity of the at least one LED when operating at the power of the predetermined level and supplies the measured values to the control unit.
- the control unit can thereby adjust the predetermined level by means of supplied measured values so that the light intensity of the at least one LED remains constant during operation with the power of the predetermined level.
- An external dimming command of the light intensity can be made via an interface.
- the invention further provides that in the case of a dimming command coming from the outside, the light intensity of the dimming value actually set on the at least one LED takes place as a function of the predetermined level. This means that the actual dimming of the at least one LED is scaled down accordingly to the current value of the predetermined level.
- an incoming dimming command from outside can be done by adaptive adaptation to external conditions, such as daylight.
- an incoming dimming command from outside can be done by means of an input from another system, for example an external sensor device or a central circuit.
- the adjustment of the brightness of the at least one LED can be done via a power control with a limited value, for example via a pulse width modulation.
- At least one OLED or a combination of LEDs and OLEDs can be operated instead of the at least one LED.
- the invention provides a system comprising a central control unit, a bus and at least two operating devices connected to the bus for operating in each case at least one LED.
- Each operating device includes a control electronics for Adaptation of a bus supply current to the operating characteristics of the at least one LED.
- the maximum power of each LED is limited in a first phase of operation to a predetermined level below the maximum allowable power supply.
- the invention further relates to an operating device for operating at least one LED or OLED having an interface for supplying external dimming commands starting from a central control unit or a sensor and a control electronics; for controlling or regulating a supply current to the operating characteristics of the at least one LED or OLED as a function of incoming dimming commands, wherein the operating device regulates or sets the supplied power or the supplied current of the at least one LED to a predetermined level in a first operating phase, and the operating device thereby an external dimming command is ignored or implemented, in particular downscaled, that the LED or OLED power does not exceed or fall below the predetermined level in the first phase of operation.
- an incoming dimming command is implemented in a suitable manner.
- the predetermined level approaches within the first phase of operation the value of the maximum allowable power supply.
- the central control unit has an interface via which a Dimr ⁇ command of the intensity of light arriving from outside can take place.
- An incoming dimming command can be ignored by the corresponding operating device during the first operating phase of an LED.
- an incoming dimming command can be rescaled so that the actual dimming of each LED takes place as a function of the predetermined level.
- FIG. 2 shows schematically an exemplary embodiment of an operating device according to the invention
- FIG. 3 shows an exemplary method of how a dimming command can be scaled in dependence on the predetermined level
- Fig. 4 shows schematically a
- Fig.l qualitatively shows the time course of the intensity decrease in LEDs.
- the light intensity is vertical and the time horizontally, both with arbitrary units, located.
- Row 1 represents the drop in intensity of an LED, which is constantly operated with the normal operating parameters for them. It can be clearly seen that the intensity initially decreases very sharply and in the further course of the waste stagnates more and more. This roughly corresponds to an exponential curve.
- Row 2 represents the intensity drop of an LED during operation according to the invention.
- the LED m of the first phase of operation i. is operated in the starting phase of the operation with a power that is below the maximum allowable power.
- the maximum permissible power should correspond to the normal operating parameters of the LED.
- the duration of this first phase of operation depends on the structure and the geometry of the components used (LED / OLED) and typically takes between 20 and 200 hours. In the simplest case, a suitable drive could be such that the light intensity of the OLED is e.g. to 80% of the initially possible maximum light intensity constant.
- the end of the first phase of operation is reached when the LED is operated with the maximum permissible power. In FIG. 1, therefore, the end of the starting phase is reached approximately at the time 12.
- the drive parameters are kept constant, as would be the case during normal operation. As a result, the light intensity will slowly drop.
- FIG. 2 shows a schematic exemplary embodiment of the operating device 1 for operating at least one LED and / or OLED 9.
- the operating device consists essentially of a control electronics 2 and a control unit 3. Control electronics 2 and control unit 3 communicate via an interface 7. Optionally, the operating device may still have a memory 4 and / or an operating hours counter 11.
- the control electronics 2 adjusts the supply current 5 so that it has suitable operating parameters for the power supply 6 of at least one LED and / or at least one OLED 9.
- the control electronics can for this purpose comprise an AC-DC converter, and an electronic circuit for current and voltage adjustment or limitation.
- the control unit 3 is responsible for an intelligent control of the control electronics.
- the control unit 3 controls the drive unit according to the inventive principle, as has been explained in the description of Fig.l. In addition, it is for other, such as user-initiated inputs and the appropriate control of the control electronics responsible. It is also possible that it regulates the control electronics adaptive.
- the control unit thus generally represents an intelligent controller which can perform mathematical calculations or represents electronic data processing.
- control unit is implemented as an integrated circuit.
- drive electronics is implemented in the same integrated circuit.
- memory and / or the operating hours counter are also located in the same integrated circuit or on the same substrate.
- the control unit has an operating hours counter 11. This is used to count the operating hours and thus to increase the power supplied to the at least one LED successively during operation.
- a linear increase in power would be conceivable.
- the increase is preferably logarithmic in order to optimally compensate for the light intensity of the at least one LED dropping exponentially with the operating time.
- the time history of the power can follow any other nonlinear curve.
- the time course can not only consist of a continuous curve, but also have individual discrete values.
- a memory 4 has a time-predetermined course of the predetermined level. For this purpose, it can be provided that a starting value below 100% current value is selected for the time course
- OTPs One Time Programmable Memory
- This information of the time course can be supplied to the control unit 3, which in turn controls the LED operation by means of the control electronics.
- the compensation of the drop in intensity of the at least one LED by a measuring device 12 takes place.
- This is connected by means of an interface 8 to the control unit.
- the measuring device integrated both externally and in the control unit may be on the same substrate or in the same integrated circuit.
- the measuring device is preferably a light sensor
- the target value for this is the light
- the control unit now controls the activation of the at least one LED in such a way that the discrepancy between the actual value and the nominal value is compensated. In this way, the at least one LED always shines bright in the first phase of operation.
- the brightness of the at least one LED is also adjustable from the outside. This means that outside forced dimming is possible.
- the illumination can be adapted by the at least one LED to the ambient light.
- another sensor for example a daylight sensor, which measures the ambient light.
- a dimming command is initiated by another system, for example a central control.
- the operating device is connected via an interface 12 to a bus.
- control unit calculates the activation parameters of the at least one LED as a function of the incoming dimming command and the discrepancy between the actual and desired values or the time profile of the predetermined level.
- Fig. 3 illustrates an example method of how the calculation can be made. This example assumes that the level is adjusted using a light sensor.
- step S101 initial initialization is triggered.
- the light of the LED is set at the predetermined level, for example, 80% of the maximum allowable power.
- the light intensity I, "" is measured out.
- this value is assigned to the variable i S0LL , m .
- This value serves as a reference for the further adaptation of the predetermined level in the course of the first operating phase.
- this Clearinitialmaschine from SlOl to S103 takes place only once when the first startup of the LED.
- the actual light intensity I IST is again measured. This is compared with the setpoint in S105. If there is a discrepancy between the two, then the predetermined level adjusted so that the actual and setpoint are equal.
- the adjustment of the predetermined level in S104 and S105 can be done directly in this case. This means that no measurement of the light intensity and no calculation of the level to be used is necessary. Instead, the level can be successively increased directly following a predetermined curve during operation.
- an external dimming command D is measured, which has been set on a user interface, for example.
- the actual light intensity i IST is then calculated as a function of the preset level P and the dimming value D.
- the light intensity would I IS 45%.
- the preset level over the operating time in a linear or non-linear manner changed.
- the actual light intensity i IST is calculated from a nonlinear formula. This means that the actual light intensity i ⁇ T is scaled down in a non-linear manner.
- the determination of the actual light intensity l I ⁇ T to be set could also be made via a table (look-up table).
- a table can assign to each combination of a dimming value and a preset level an actual luminous intensity i IST to be set.
- the table can assign to each combination of a dimming value and a preset level an actual luminous intensity i IST to be set.
- any other form of calculation is possible. All that matters is that, on the one hand, the aging of the LED is compensated and, on the other hand, the actual intensity of light, in particular its properties which have a subjective effect on the observer, correspond to the set value.
- a compensation of the set dimming value must therefore always in the first phase of operation dynamically in time, ie according to the currently valid preset level, take place.
- the intensity value determined in S107 is converted by the control unit into corresponding operating parameters for the LED. These are supplied to the control electronics so that the LED lights up in the desired manner. For this purpose, for example, a pulse width modulation or a current control can be used.
- S108 it is determined whether the LED is still in the first phase of operation. This can preferably be determined via the current level. If this is lower than the maximum permissible power, the LED is still in the first operating phase.
- a predetermined operating time can also be defined as the first operating phase.
- the first phase of operation is not yet over, it returns to S104.
- a time t may be waited before re-adjusting the level in S104.
- the level is no longer changed. In this case, jump directly to S106. Optionally, a time t can be waited again.
- the light intensity is momentarily raised to the predetermined level, i. the maximum permitted by the operating device light intensity, set and so performed a comparison between the actual and setpoint.
- the predetermined level i. the maximum permitted by the operating device light intensity
- the light intensity set by the dimming is maintained.
- the dimming value is calculated into the measured light intensity so that the actual value when operating the LED with The predetermined level can be determined by calculation. In this way, again, a comparison with the target value set in S103 can be performed.
- execution 2 Since the first execution may possibly lead to a kind of flashing, execution 2 is to be preferred, as long as an error-free compensation of the dimming value is possible. Therefore, it is also conceivable to use this procedure in S102 and S103 to determine i ⁇ 0LL / MAX .
- the system 16 consists of a central bus unit 17 and three operating devices 15, wherein only the first operating device is shown in detail.
- the central bus unit is connected to an electrical power supply 10. Furthermore, it has an interface 8 via which a dimming command can be received. This can be done by a user input.
- An input device for example a rotary knob, can be present for this purpose on the central bus unit or externally.
- a display device such as a display is conceivable, for example, to display the preset level per LED / LED module or the set dimming value. In addition, this can be done by a measuring device 12. It may be a light sensor and / or a motion sensor. It is also conceivable that such a sensor as a device 13 on the central bus unit located.
- the dimming command can be carried out by an external system.
- Bus unit and operating equipment connects.
- the communication bus or
- Address bus and the power bus are two different devices.
- the communication via a radio interface and the communication via a radio interface.
- Each operating device has its own “intelligence" in the form of a central control unit 3 and optionally a memory 4 and / or an operating hours counter 11.
- control electronics 2 and a connection 6 for connecting at least one LED 9.
- connection 6 for connecting at least one LED 9.
- any combination of LEDs and OLEDs can be used again.
- each LED or LED module is operated in a first phase of operation at a predetermined level which is below the maximum allowable power supply. This is increased in the manner described above during the first phase of operation.
- the regulation of the predetermined level is performed by each operating device for the connected thereto LED or the LED module individually. This is particularly advantageous when a single LED or a single LED module is replaced once and thus this is at the beginning of the first phase of operation.
- a dimming command entering into the central bus unit, or a dimming command set by the central bus unit, can be forwarded to each operating device. This is then preferably processed locally in each operating device. In this case, an adjustment of the light intensity to the dimming command is again performed as a function of the predetermined level.
- dimming commands are ignored by any control gear whose LEDs are still in the first phase of operation. In this way, the LEDs in the first phase of operation always light up brightly.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009014998A DE102009014998A1 (de) | 2009-03-26 | 2009-03-26 | Dimmbares Betriebsgerät und Beleuchtungssystem zur Erhöhung der Lebenserwartung bei LEDs und OLEDs |
PCT/EP2010/053914 WO2010108982A1 (de) | 2009-03-26 | 2010-03-25 | Dimmbares betriebsgerät und beleuchtungssystem zur erhöhung der lebenserwartung bei leds und oleds |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2412206A1 true EP2412206A1 (de) | 2012-02-01 |
EP2412206B1 EP2412206B1 (de) | 2017-02-08 |
Family
ID=42635289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10711056.1A Active EP2412206B1 (de) | 2009-03-26 | 2010-03-25 | Dimmbares betriebsgerät und beleuchtungssystem zur erhöhung der lebenserwartung bei leds und oleds |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2412206B1 (de) |
DE (2) | DE102009014998A1 (de) |
WO (1) | WO2010108982A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009014998A1 (de) | 2009-03-26 | 2010-09-30 | Tridonicatco Gmbh & Co. Kg | Dimmbares Betriebsgerät und Beleuchtungssystem zur Erhöhung der Lebenserwartung bei LEDs und OLEDs |
DE102012224206A1 (de) | 2012-12-21 | 2014-06-26 | Tridonic Gmbh & Co. Kg | LED-Konverter mit Froststart-Funktion |
DE102016218625A1 (de) * | 2016-09-27 | 2017-09-07 | Siemens Schweiz Ag | Verfahren und Anordnung zur Helligkeitsregelung, insbesondere Konstantlichtregelung |
DE102016221771A1 (de) | 2016-11-07 | 2018-05-09 | Bayerische Motoren Werke Aktiengesellschaft | Beleuchtungsvorrichtung und Beleuchtungssystem für ein Kraftfahrzeug sowie Verfahren zum Betreiben eines Beleuchtungssystems für ein Kraftfahrzeug |
DE102016221770A1 (de) * | 2016-11-07 | 2018-05-09 | Bayerische Motoren Werke Aktiengesellschaft | Beleuchtungsvorrichtung und Beleuchtungssystem für ein Kraftfahrzeug sowie Verfahren zum Betreiben eines Beleuchtungssystems für ein Kraftfahrzeug |
DE102019115817A1 (de) | 2019-06-11 | 2020-12-17 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Verfahren zum Betreiben einer Leuchtdiodenanordnung, Verfahren zum Charakterisieren einer Leuchtdiode und Leuchtdiodenanordnung |
NL2023562B1 (en) | 2019-07-24 | 2021-02-10 | Eldolab Holding Bv | Smart starting up method by an LED driver |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6236331B1 (en) | 1998-02-20 | 2001-05-22 | Newled Technologies Inc. | LED traffic light intensity controller |
DE19818621A1 (de) | 1998-04-25 | 1999-10-28 | Mannesmann Vdo Ag | Schaltungsanordnung zur Einstellung der Helligkeit stromgesteuerter Leuchtdioden zur Beleuchtung einer Anzeige |
US6225760B1 (en) * | 1998-07-28 | 2001-05-01 | Lutron Electronics Company, Inc. | Fluorescent lamp dimmer system |
US6871983B2 (en) * | 2001-10-25 | 2005-03-29 | Tir Systems Ltd. | Solid state continuous sealed clean room light fixture |
DE20220356U1 (de) | 2002-06-20 | 2003-06-05 | Insta Elektro Gmbh | Beleuchtungseinrichtung |
US7138970B2 (en) | 2002-12-09 | 2006-11-21 | Lockheed Martin Corporation | Method of LED life extension and end-of-life prediction |
US7224332B2 (en) * | 2003-11-25 | 2007-05-29 | Eastman Kodak Company | Method of aging compensation in an OLED display |
DE112004002965A5 (de) * | 2004-10-06 | 2007-09-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung und Verfahren zum Ansteuern einer organischen Leuchtdiode |
WO2006042050A2 (en) * | 2004-10-08 | 2006-04-20 | B/E Aerospace, Inc. | Dimmable reading light with emergency lighting capability |
DE102005024449A1 (de) | 2005-02-25 | 2006-09-07 | Erco Leuchten Gmbh | Leuchte |
WO2007046795A1 (en) | 2005-10-17 | 2007-04-26 | Acuity Brands, Inc. | Constant lumen output control system |
JP5038690B2 (ja) | 2006-01-17 | 2012-10-03 | パナソニック株式会社 | 照明器具 |
JP2009545108A (ja) | 2006-07-21 | 2009-12-17 | オスラム ゲゼルシャフト ミット ベシュレンクテル ハフツング | 電子安定器を制御するための受光器を備える照明システム |
US20080258637A1 (en) | 2007-04-20 | 2008-10-23 | Shun Kei Leung | Light emitting element driver and control method therefor |
DE102009014998A1 (de) | 2009-03-26 | 2010-09-30 | Tridonicatco Gmbh & Co. Kg | Dimmbares Betriebsgerät und Beleuchtungssystem zur Erhöhung der Lebenserwartung bei LEDs und OLEDs |
-
2009
- 2009-03-26 DE DE102009014998A patent/DE102009014998A1/de not_active Withdrawn
-
2010
- 2010-03-25 DE DE112010001271T patent/DE112010001271A5/de not_active Withdrawn
- 2010-03-25 WO PCT/EP2010/053914 patent/WO2010108982A1/de active Application Filing
- 2010-03-25 EP EP10711056.1A patent/EP2412206B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010108982A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010108982A9 (de) | 2010-11-18 |
EP2412206B1 (de) | 2017-02-08 |
DE102009014998A1 (de) | 2010-09-30 |
WO2010108982A1 (de) | 2010-09-30 |
DE112010001271A5 (de) | 2012-11-15 |
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