WO2011033432A1 - Module d'éclairage - Google Patents

Module d'éclairage Download PDF

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Publication number
WO2011033432A1
WO2011033432A1 PCT/IB2010/054084 IB2010054084W WO2011033432A1 WO 2011033432 A1 WO2011033432 A1 WO 2011033432A1 IB 2010054084 W IB2010054084 W IB 2010054084W WO 2011033432 A1 WO2011033432 A1 WO 2011033432A1
Authority
WO
WIPO (PCT)
Prior art keywords
lighting module
operating current
lumen
light emitting
lumen output
Prior art date
Application number
PCT/IB2010/054084
Other languages
English (en)
Inventor
Geert Willem Van Der Veen
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2011033432A1 publication Critical patent/WO2011033432A1/fr

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
    • H05B45/12—Controlling the intensity of the light using optical feedback

Definitions

  • the present invention relates to a lighting module comprising a control circuitry configured to control the operating current between a minimum operating current and a maximum operating current based on a predetermined lumen output and a lumen depreciation.
  • SSL light sources are increasingly used in various lighting applications such as, for example, luminaires.
  • a difficulty with SSL light sources is that the lumen output, or brightness, of an SSL light source may vary in response to changing the die temperature, aging and other factors, despite a constant operating current.
  • modern lighting modules that use SSL light sources such as the DLM Lexel from Philips, controls the lumen output to a
  • the lighting modules are typically delivered to OEM luminaire producers who design the lighting modules into their luminaires.
  • the operating current that is required to maintain lumen output tends to increase during the lifetime of the lighting module, a luminaire using the lighting module may suffer from overheating, and increased electromagnetic interference as the lighting module ages.
  • a lighting module comprising: at least one light emitting device; power supply circuitry to supply an operating current to the at least one light emitting device; and control circuitry configured to control the operating current between a minimum operating current and a maximum operating current based on a predetermined lumen output and a lumen depreciation of said at least one light emitting device, wherein the control circuitry is capable of allowing the maximum operating current independently of the predetermined lumen output and the lumen depreciation of the at least one light emitting device.
  • the present invention is based on the understanding that by providing a lighting module with control circuitry that allows a maximum operating current to be supplied to the at least one light emitting device independently of the predetermined lumen output and the lumen depreciation, the OEM luminaire producers can easily test their luminaires using the highest power that is achieved over the lifetime of the lighting module. This enables an improved luminaire design as the cooling capacity can be adapted to cope with the heat developed for the higher power required in an aged SSL light source.
  • approbation tests (such as harmonics, power factor, temperature, EMI, etc) can be performed at the correct input power levels.
  • lumen output should here be understood as the quantity of light that leaves a light source, such as the lighting module.
  • lumen depreciation here refers to a reduction in lumen output of the lighting module (for a constant operating current) that may occur, for example, as the light emitting devices in the lighting module ages, or as temperature of the light emitting devices is increased. (Light emitting devices such as light emitting diodes may have a temperature dependence such that the light output at higher temperature is less. This can be compensated by increasing the operating current.)
  • minimum operating current is here intended to indicate the lowest operating current that may be used for achieving the predetermined lumen output during the lifetime of the lighting module (i.e.
  • the lighting module may further comprise a light sensor, such as a photo diode, for measuring a lumen output from the at least one light emitting device, wherein the lumen depreciation is indicated by the measured lumen output. This enables a feedback loop where the operating current is adjusted based on the actual lumen output to achieve the predetermined lumen output.
  • a light sensor such as a photo diode
  • the lumen depreciation may be estimated from a burning time of the lighting module.
  • the relationship between the lumen depreciation and the burning time may be known from prior experiments and accessible to the control circuitry e.g. in the form of a look-up table or a mathematical function. It is noted that the estimation of the lumen depreciation may be explicit or implicit. An example of the latter would be the use of a function that describes the operating current required to achieve the predetermined output as a function of burning time. An advantage with an approach where the lumen depreciation is estimated from the burning time is that no light sensor is required thereby enabling a cost-efficient solution.
  • the at least one light emitting device may be a solid state lighting (SSL) light source, such as a light emitting diode (LED), an organic light emitting diode (OLED), or a polymer light emitting diode (PLED).
  • SSL solid state lighting
  • LED light emitting diode
  • OLED organic light emitting diode
  • PLED polymer light emitting diode
  • control circuitry may be a programmable device that includes computer executable code that controls operation of the programmable device for controlling lumen output of light emitted by the lighting module.
  • the control device may further comprise an interface that allows an external device (or control unit) to communicate with the control circuitry.
  • the control circuitry may receive instructions to supply the maximum operating current independently of the predetermined lumen output and the lumen depreciation.
  • a computer that controls the lighting module during testing may trigger a supply of the maximum operating current.
  • the interface may be a digital interface, such as, e.g. DALI (Digital Addressable Lighting Interface), RDM (Remote Device Management), and DMX (Digital Multiplex).
  • control circuitry may be configured to enable a supply of the maximum operating current (independently of the predetermined lumen output and the lumen depreciation) to be triggered by means of a connector or a switch (e.g. a micro switch).
  • a connector or a switch e.g. a micro switch
  • the supply of the maximum operating current can be triggered manually, this arrangement does not require an external device (e.g. a computer) which is configured to trigger the supply of the maximum operating current.
  • the lighting module can be used with existing test equipment. It is noted that the invention relates to all possible combinations of features recited in the claims.
  • Fig. 1 schematically illustrates a lighting module according to an embodiment of the invention
  • Fig. 2a schematically illustrates how the lumen output of a lighting module is reduced as the LEDs in the lighting module age
  • Fig. 2b schematically illustrates how the operating current must be increased to maintain a constant lumen output as the LED in the lighting module age
  • Fig. 3 is a schematic block diagram illustrating a method to maintain a constant lumen output
  • Fig.4 is a schematic block diagram illustrating a test procedure for testing a luminaire provided with a lighting module.
  • a lighting module 100 according to an embodiment of the invention.
  • the lighting module 100 is here an LED module 100 comprising an array of light emitting diodes (LEDs) 102, power supply circuitry 104 comprising an LED driver for each LED, and control circuitry 106 configured in electrical connection with the power supply circuit 104.
  • the control circuitry 106 is here a programmable device (e.g. a microprocessor, microcontroller, or programmable digital signal processor) that includes computer executable code that controls operation of the programmable device.
  • the control circuitry is here provided with a digital interface 107, such as DALI or
  • the lighting module here also includes a light sensor 108, such as a photo receiver diode, for measuring the lumen output (or luminous flux) of the LEDs 102.
  • the lighting module may also include a heat sink to provide enhanced thermal dissipation, and beam shaping optics (e.g. lenses and reflectors).
  • the power supply circuitry 104 provides input power to the lighting module by supplying an operating current to each of the LEDs 102 whereby light is emitted by the LEDs 102.
  • the lumen output, or brightness, of the lighting module tends to decrease (for a constant operating current) as the LEDs ages. This lumen
  • the initial operating current i.e. the operating current for a new LED
  • the maximum operating current of the LED is below the maximum operating current of the LED. Then, as the LED ages the operating current is increased to maintain a constant lumen output.
  • Fig. 2b schematically illustrates an example of how the operating current must be increased from a minimum operating current, I m i n , for a new LED module, to a maximum operating current, I max ,at the end-of-life of the lighting module in order to maintain a constant lumen output as the LEDs in the lighting module age.
  • a method to maintain a constant lumen output is schematically illustrated by the block diagram in Fig. 3. The method is here described in relation to the LED module 100 in Fig. l.
  • step 301 the control circuitry 106 receives a measurement from the light sensor 108 indicating the total lumen output of the light emitted by the LEDs 102 in the lighting module 100.
  • the measured lumen output is then compared, in step 302, to a predetermined value indicating a desired lumen output.
  • step 303 the control circuitry 106 controls the power circuitry 104, to adjust the operating currents to the LEDs 102 to reduce any difference between the measured lumen output and the desired lumen output.
  • the method provides a feedback loop that controls the operating current to each of the LEDs such that the total lumen output of the lighting module is maintained at a desired lumen output, e.g. 1000 Lumen.
  • step 304 it is possible to supply the maximum operating current to the LEDs independently of the predetermined lumen output and the lumen depreciation as indicated by step 304.
  • This is achieved by overriding the feedback loop.
  • An override of the feedback loop can be triggered, for example, by means of a predetermined command which is received by the control circuitry from an external device via the digital interface 107.
  • it may also be triggered by means of a connector, or (micro-)switch.
  • an override of the feedback loop can be achieved in various ways.
  • One way would be to set the predetermined value which indicates a desired lumen output to a value higher than the maximum lumen output that can be achieved by the lighting module.
  • Another way would be to disable the light sensor 108 (or reduce the measured value) such that the measured lumen output stays below the desired lumen output no matter how high the lumen output actually is. Either way the feedback loop will be tricked into increasing the operating current to a maximum value.
  • Yet another alternative would be to utilize a separate circuit to override the feedback loop, i.e. to provide a first circuit that implements the feedback loop, and a second circuit that by-pass the feedback loop and always supplies maximum operating current.
  • Fig. 4 schematically illustrates a test procedure for evaluating the performance of a luminaire designed to use the above described lighting module. A more detailed description of such a test procedure can be found in ASSIST recommends,
  • the LED module performance is characterized as a function of temperature. This can be done by arranging the LED module in a test chamber provided with a heater. As the test chamber provides a controlled ambient temperature in the chamber, the LED module can be tested for various temperatures. For each temperature for which the LED module is tested a set of photometric and electric quantities are measured such as luminous flux, spectral power distribution, voltage, current, active and apparent power, power factor total harmonic distortion.
  • step 402 the LED temperature is determined as the LED module is operating inside the luminaire.
  • the luminaire performance is evaluated in step 403. Knowing the LED temperature for the luminaire type from step 402, the luminaire performance can be evaluated by estimating, the luminous flux, luminous efficacy, CIE x,y, CCT, and CRI for various temperatures from the set of characteristics found in step 401. Typically, the above procedure includes a worst possible application scenario, where the luminaire is tested for the worst case temperatures. This may be useful in deciding whether additional thermal management is needed to further improve the performance of the luminaire.
  • the above test procedure may preferably be performed twice.
  • the first time the test procedure is performed the feedback loop is activated, to determine the performance of the lighting module and luminaire at the start of its life (i.e. for a relatively low operating current).
  • the second time the test procedure is performed the feedback loop is disabled, and the maximum operating current is supplied (independently of the predetermined lumen output and the lumen depreciation) to simulate end-of-life of the lighting module and verify whether the optical performance, the heat dissipation, and the electromagnetic interference (EMI) is still within limits.
  • EMI electromagnetic interference

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne un module d'éclairage qui comprend : au moins un dispositif électroluminescent ; un circuit d'alimentation électrique permettant d'apporter un courant de fonctionnement au(x) dispositif(s) électroluminescent(s) ; et des circuits de commande conçus pour commander le courant de fonctionnement entre un courant de fonctionnement minimum et un courant de fonctionnement maximum en fonction d'un rendement en lumen prédéfini et d'une dépréciation du flux lumineux du ou des dispositifs électroluminescents, les circuits de commande pouvant autoriser le courant de fonctionnement maximum indépendamment du rendement en lumen prédéfini et de la dépréciation du flux lumineux.
PCT/IB2010/054084 2009-09-18 2010-09-10 Module d'éclairage WO2011033432A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09170737 2009-09-18
EP09170737.2 2009-09-18

Publications (1)

Publication Number Publication Date
WO2011033432A1 true WO2011033432A1 (fr) 2011-03-24

Family

ID=43382507

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/054084 WO2011033432A1 (fr) 2009-09-18 2010-09-10 Module d'éclairage

Country Status (2)

Country Link
TW (1) TW201117644A (fr)
WO (1) WO2011033432A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9980353B2 (en) 2014-06-30 2018-05-22 Philips Lighting Holding B.V. Device management

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070211463A1 (en) * 2000-12-20 2007-09-13 Gestion Proche Inc. Lighting device
EP1881743A2 (fr) * 2006-07-10 2008-01-23 Toshiba Lighting & Technology Corporation Appareil d'éclairage
US20080238340A1 (en) 2007-03-26 2008-10-02 Shun Kei Mars Leung Method and apparatus for setting operating current of light emitting semiconductor element
EP2085686A1 (fr) * 2004-12-17 2009-08-05 OSRAM Opto Semiconductors GmbH Elément de phare automobile
WO2010141269A2 (fr) * 2009-06-02 2010-12-09 Dolby Laboratories Licensing Corporation Boîtier de del multipuces et unité de rétroéclairage l'utilisant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070211463A1 (en) * 2000-12-20 2007-09-13 Gestion Proche Inc. Lighting device
EP2085686A1 (fr) * 2004-12-17 2009-08-05 OSRAM Opto Semiconductors GmbH Elément de phare automobile
EP1881743A2 (fr) * 2006-07-10 2008-01-23 Toshiba Lighting & Technology Corporation Appareil d'éclairage
US20080238340A1 (en) 2007-03-26 2008-10-02 Shun Kei Mars Leung Method and apparatus for setting operating current of light emitting semiconductor element
WO2010141269A2 (fr) * 2009-06-02 2010-12-09 Dolby Laboratories Licensing Corporation Boîtier de del multipuces et unité de rétroéclairage l'utilisant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Recommendations for Testing and Evaluating White LED Light Engines and Integrated LED Lamps Used in Decorative Lighting Luminaires", ASSIST RECOMMENDS, vol. 4, no. 1, May 2008 (2008-05-01)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9980353B2 (en) 2014-06-30 2018-05-22 Philips Lighting Holding B.V. Device management

Also Published As

Publication number Publication date
TW201117644A (en) 2011-05-16

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