EP2473007B1 - Module DEL pour la stabilisation passive du flux lumineux - Google Patents

Module DEL pour la stabilisation passive du flux lumineux Download PDF

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Publication number
EP2473007B1
EP2473007B1 EP20110196004 EP11196004A EP2473007B1 EP 2473007 B1 EP2473007 B1 EP 2473007B1 EP 20110196004 EP20110196004 EP 20110196004 EP 11196004 A EP11196004 A EP 11196004A EP 2473007 B1 EP2473007 B1 EP 2473007B1
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EP
European Patent Office
Prior art keywords
led
leds
led module
constant
luminous flux
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Not-in-force
Application number
EP20110196004
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German (de)
English (en)
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EP2473007A1 (fr
Inventor
Stephan Ebner
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Zumtobel Lighting GmbH Austria
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Zumtobel Lighting GmbH Austria
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Publication of EP2473007A1 publication Critical patent/EP2473007A1/fr
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    • 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

Definitions

  • the invention relates to an LED module, an LED lamp, an LED lamp and an LED system, which are designed for passive luminous flux stabilization, and a method for passive luminous flux stabilization.
  • an LED chip Under LED is described in the invention an LED chip. This can be mounted in various ways on a support element of the LED module. For example, it is known to arrange LEDs according to the chip on board technology (COB) directly on a module either "face-up” or “face-down". However, other types of mounting are known in which the LED is designed, for example, as a so-called suface-mounted device (SMD), the present invention being based on all the above-mentioned and further known mounting variants.
  • COB chip on board technology
  • SMD suface-mounted device
  • a potting compound may be arranged on the module, which surrounds the LED chip. Accordingly, the LED chip may be encapsulated by potting compound.
  • This potting compound is preferably made of liquid plastic in the form of epoxy or silicone and is applied by means of a dispensing method on the module. Instead of the potting compound or in addition to a mechanical protection of the LEDs can be provided. This can be applied directly to the LED module. For example, so-called globe tops, so applied by dispensing potting compounds may be provided which surround the LED.
  • a constant current LED will increase in light output as the temperature increases be dropped; ie the luminous flux decreases with increasing temperature. If, however, the LED is operated at a constant voltage, the light output increases with increasing temperature; ie the luminous flux increases with increasing temperature (cf. Fig. 1 ). In the aforementioned cases thus takes place an opposite change in the luminous flux with increasing (operating) temperature. Since the change in luminous flux causes a change in the sensation of light, in luminaires with constant-current-driven LEDs or constant-voltage-driven LEDs, an active luminous flux stabilization is carried out on the basis of the temperature-dependent emission behavior of the LEDs in accordance with the respective operating modes. For this purpose, an active control loop and / or an external control are necessary in order to keep the luminous flux constant over the changing temperature.
  • an optoelectronic device with a first LED and a second LED is known in which an intensity stabilization of the light emitted by the second LED is effected.
  • the invention describes an LED module for a passive luminous flux stabilization comprising at least two similar LEDs, wherein at least one first constant current LED is operable and at least one second constant-voltage LED is operable such that the jointly emitted luminous flux of the LEDs of the LED module over a predetermined temperature range is substantially constant.
  • the invention thus makes use of the two opposing effects mentioned in the introduction in order to form an LED module which achieves substantially the same, ie a preferably unchanged, light output (luminous flux) even over a wide temperature range.
  • LEDs are operated on the one hand at constant current and other LEDs at a constant voltage.
  • the LED module for this purpose has means for operating the LEDs at constant current and constant voltage. Consequently, there is an over the entire predetermined temperature range, for example.
  • the operating temperature range a nearly constant jointly emitted luminous flux of the LEDs of the LED module.
  • a passive luminous flux stabilization of several, preferably the same LEDs is achieved.
  • the LEDs are thereby operated at the same temperature level, that is, for example, on the same circuit board.
  • the LEDs in groups (for example, separated by constant current operated LEDs and constant voltage operated LEDs) or individually or in modules to operate at different temperature levels. This can be achieved, for example, either by arrangement on different printed circuit boards and / or by different cooling of the respective LEDs or LED groups on a printed circuit board.
  • the ratio of the number of constant-current-driven LEDs to the number of constant-voltage-driven LEDs corresponds to the ratio of the change in the luminous flux of the respective LEDs (that is, on the one hand, the constant-current-driven LEDs and, on the other hand, the constant-voltage-driven LEDs) over the predetermined temperature range.
  • the ratio of the number of LEDs operating at constant voltage and constant current can be adjusted such that the decrease in the luminous flux of the LEDs, which are operated at constant current, due to the temperature rise, is due to the increase in the luminous flux of the LEDs , which are operated at a constant voltage is compensated.
  • the number of respective LEDs can thus be adapted particularly precisely such that the light output remains constant.
  • the ratio of constant voltage driven LED to constant current operated LEDs is 1: n, more preferably 1: 3, further preferably 1: 4.
  • Such LED groups could be arranged repeatedly (for example within a luminaire) become.
  • the constant-current-driven LEDs and the constant-voltage-driven LEDs are arbitrarily stackable, that is, in an LED module, the aforementioned LED groups (m: n) can be simply or repeatedly provided. In this way, a predetermined total luminous flux can be achieved in a simple manner.
  • the LED module may comprise LEDs of different types, wherein for each LED type at least a first constant current LED is operable and at least one second LED is operable with constant voltage such that the jointly emitted luminous flux of the LEDs of a type over a predetermined temperature range in the Is essentially constant.
  • each LED type at least a first constant current LED is operable and at least one second LED is operable with constant voltage such that the jointly emitted luminous flux of the LEDs of a type over a predetermined temperature range in the Is essentially constant.
  • both luminous flux curves are substantially linear over the temperature of the respective LEDs.
  • the LEDs preferably comprise blue or green LEDs; however, they may also include other monochromatic LEDs, such as red or yellow LEDs.
  • indium gallium nitride InGaN
  • GaP gallium phosphide
  • GaAsP gallium arsenide phosphide
  • color conversion material and / or scattering particles are distributed over the space in the emission direction of the LEDs.
  • the previously described Potting compound containing the color conversion particles and / or the scattering particles are distributed over the space in the emission direction of the LEDs.
  • the previously described Potting compound containing the color conversion particles and / or the scattering particles are distributed over the space in the emission direction of the LEDs.
  • the radiation emitted by the LED is thus partially absorbed and radiation in another wavelength range, usually at longer wavelengths, emitted.
  • the color conversion particles which are preferably contained in the potting compound surrounding the LED, the light is thus at least partially converted into light of a higher (or lower) wavelength.
  • red light can be easily generated by means of a UV LED or a blue LED and used in a LED module with passive luminous flux stabilization. For red LEDs, this would be difficult to implement because of the progression of the two constant current and constant voltage curves of the luminous flux versus temperature.
  • UV radiation emitted by the LED may be "converted" to ("visible") light by phosphor particles.
  • an LED module is known with an LED that emits blue light and fluorescent in the form of fluorescent particles that partially absorb the blue light emitted by the LED and emits yellow light, so to speak, blue light in yellow or "yellowish” Convert light.
  • phosphor which converts blue light into green or “greenish” or red or “reddish” light.
  • RGB LED modules or general multi-color systems can be realized in which the luminous flux is stabilized in the passive path described above.
  • the phosphor used is usually particles of fluorescent material.
  • the fluorescence and phosphorescence processes summarized under the generic term “luminescence” are described in this application (for the sake of simplicity) by the term “fluorescent".
  • the present invention is not limited to LEDs of a particular wavelength or mounting type.
  • any monochromatic LED can be arranged on the LED module.
  • a red-emitting LED may be mounted on the LED module, which is surrounded by potting compound with or without color conversion particles.
  • LEDs which are enclosed with potting compounds with different color conversion particles can be arranged on the LED module.
  • An advantage of the LED module according to the invention is also that in a method for passive luminous flux stabilization, a predetermined constant operating point of the luminous flux of the LED module can be adjusted independently of the operating temperature and ambient temperature by a suitable choice of the operating current and / or the operating voltage.
  • the operating point for the final lighting achieved can be set to a value at which a particularly good and efficient light output is achieved. As a result, the efficiency can be increased again.
  • the invention comprises an LED lamp with an LED module of the type described above.
  • the LED lamp is a retrofit LED lamp and has mechanical and electrical connecting parts corresponding to halogen lamps, compact fluorescent lamps or incandescent lamps.
  • the LED module can be used as a conventional lamp, for example, in each lamp. Consequently, the invention also includes an LED lamp with an LED module or a LED lamp of the type described above.
  • the invention further describes an LED system comprising an LED module or an LED lamp or an LED lamp of the type described above, wherein the system further comprises a current source for operating the at least one first LED with a constant current and a voltage source for operating the at least one second LED with a constant voltage.
  • FIG. 1 shows a luminous flux curve over the temperature of an LED, as can be used in the LED module according to the invention.
  • the two curves shown show on the one hand the curve of the LED at constant current and on the other hand the curve of the same LED at constant voltage.
  • I 350mA
  • Luminous flux (T max, constant current) and luminous flux (T min, constant current) correspond to the luminous flux of the LED operated at constant current on the one hand at the lower end of the temperature range, ie at the lowest (the minimum) temperature (T min ), and on the other hand at the upper end the temperature range, ie at a maximum temperature (T max ).
  • luminous flux (T max, constant voltage ) and luminous flux (T min, constant voltage ) correspond to the luminous flux of the LED operated at constant voltage on the one hand at the lower end of the temperature range, ie at the lowest temperature (T min ), and on the other hand at the upper end of the temperature range , ie at a maximum temperature (T max ).
  • an LED module with at least two similar LEDs wherein at least one first constant-current LED and at least one second constant-voltage LED are simultaneously operated. This happens in such a way that the jointly emitted luminous flux of the LEDs of the LED module is and remains substantially constant over a predetermined temperature range.
  • the predetermined temperature range preferably corresponds to the operating temperature range or at least the operating temperature range.
  • the number of constant current operated LEDs is preferably different from the number of constant voltage driven LEDs. This preferably depends on the ratio of the number of constant current operated LEDs to the number of constant voltage operated LEDs, which corresponds to the ratio of the change in luminous flux of the respective LEDs over the predetermined temperature range.
  • the ratio of the constant voltage driven LEDs to the constant current driven LEDs is preferably m: n, where "m" and "n" are selected from the range of natural numbers other than zero according to the LED type. How to determine the values for the LED ratio will be described below.
  • the two magnitudes "x" and "y” are preferably set in relation to one another and the LED module is provided with a number of constant current-operated LEDs and a Number of constant-voltage operated LEDs operated, the ratio of which corresponds to the ratio of the change in the luminous flux of the respective LEDs over the predetermined temperature range.
  • y .DELTA.T / x .DELTA.T LED ratio ⁇ a ⁇ ⁇ ltnis
  • the luminous flux increase of one LED unit operated with constant voltage and the luminous flux decrease of the other LED unit operated with constant current are at best raised to or substantially.
  • the LED module regardless of the temperature of the LEDs or the ambient temperature, the LED module always emits the same luminous flux without the need for an active luminous flux stabilization, ie without an active control circuit and / or an external control.
  • the ratio of the results for the LED module according to the first embodiment using constant voltage driven LEDs and constant current driven LEDs to achieve the best possible luminous flux stabilization is dependent on the type of LED and is generally m: n, preferably 1: n, more preferably 1: 3 (such as in the first embodiment), more preferably 1: 4.
  • the LEDs 3, 4 are preferably randomly stackable in the corresponding ratio in order to achieve a predetermined total luminous flux. It is therefore also possible to combine several LED groups with the ratio m: n corresponding to one LED module.
  • the operating temperature of the LEDs has little or no effect on the common color due to their combination.
  • FIG. 3 is exemplary of the first embodiment
  • FIG. 2 a simplified circuit diagram for an inventive LED module 1 shown.
  • the LED module 1 has three constant-current-driven LEDs 3 and a constant-voltage-driven LED 4.
  • the LED module 1 has means for operating the LEDs 3, 4 at constant current or constant voltage.
  • the constant-current-driven LEDs 3 are operated by a constant current source 5, while the constant-voltage-driven LED 4 is operated by a constant voltage source 6.
  • the current source 5 and the voltage source 6 are preferably adjustable to a constant value to allow adjustment of the operating point of the LED group to optimize the luminous efficiency.
  • any desired LED chip and any combinations of LED chips can be used, preferably green or blue LEDs.
  • the luminous flux curve of the LEDs is substantially linear over temperature.
  • the LED chips of the constant current driven LEDs 3 and the constant voltage driven LEDs 4 may have the same or different types of LEDs. If the constant-current-driven LEDs 3 and the constant-voltage-operated LEDs 4 comprise a plurality of LED chips, these are preferably in the respective group (ie for constant current and for constant voltage) of the same LED type, but may also differ depending on the requirement for color tone and the like.
  • the module can also have LEDs 3, 4 of different types, wherein preferably at least one first LED 3 can be operated simultaneously with constant current for each LED type and at least one second LED 4 can be operated with constant voltage such that the jointly emitted luminous flux of the LEDs 3 4 of a type is substantially constant over a predetermined temperature range.
  • the LEDs can furthermore be provided with a color conversion material and / or scattering particles distributed in the emission direction of the LED and over the space, which are preferably arranged in a potting compound above the LED chip.
  • the LEDs are operated at the same or different temperature levels.
  • the LEDs can be arranged on the same or different circuit boards and / or cooled differently.
  • the LED module 1 with the power source 5 and the voltage source 6 is detachably connected, for example, these can be plugged or screwed. If the LED module 1 is arranged in an LED lamp or LED lamp, then the connection to the current source 5 and the voltage source 6 can also be made via connecting elements of the LED module 1 or the LED lamp.
  • the LED module is preferably arranged in an LED lamp or designed as an LED lamp, which is particularly preferably designed as a retrofit LED lamp having mechanical and electrical connecting parts (lamp socket) corresponding to halogen lamps, compact fluorescent lamps or incandescent lamps.
  • LED system S The combination of LED module 1 or LED lamp or LED lamp with a power source 5 and a voltage source 6 is referred to as LED system S in the context of this invention.
  • LED system S1 comprising an LED module 1 and a power source 5 and a voltage source 6 is shown, wherein the to the Reference numeral "S" attached number (here "1") denotes the respective embodiment (here, the first embodiment).
  • the LED lamp may include any type of lights, such as outdoor lights (for example, facade lights or street lights) or industrial lights or lights in sales areas and the like.
  • a constant light level luminous flux
  • the operating temperature and room temperature for example, refrigerator, storage, sales area
  • FIG. 4 shows an LED module 10 (or its circuit diagram) according to a second embodiment
  • FIG. 5 an LED module 100 (or its circuit diagram) according to a third embodiment.
  • the comments made to the first embodiment also apply to the second and third embodiments, so that reference is made to the above statements to avoid repetition.
  • the reference numerals of corresponding features are retained.
  • the ratio of the constant-voltage driving LEDs 4 and the constant current driving LEDs 3 to be used for the LED module 10 is 1: 4 according to the second embodiment. This is due to the type of LED, for which a corresponding ratio results using equations (1) to (3).
  • the luminous flux for this LED type remains constant at a ratio of 1: 4 constant-voltage-driven and constant-current-driven LEDs over a predetermined temperature range, which preferably corresponds to the operating temperature range.
  • LED module 10 and power source 5 and voltage source 6 forms an LED system S2 according to the second embodiment.
  • FIG. 5 Figure 4 shows an LED module 100 having a plurality (two in the example shown) of LED groups 101, 102; here, for example, in each case corresponding to the LED module 10.
  • the LED groups 101, 102 are formed identically.
  • the module may have LEDs 3, 4 of different types, wherein at least one first LED 3 with constant current is preferably operable for each LED type and at least one second LED 4 is operable with constant voltage such that the jointly emitted luminous flux of the LEDs 3, 4 of a type is substantially constant over a predetermined temperature range.
  • Even LED groups of different LED types can be stacked as desired.
  • a predetermined total luminous flux of the LED module 100 or the LED lamp or LED lamp can be achieved.
  • the number of stackings of the LEDs 3, 4 or of the LED groups 101, 102 is not limited by the invention and results from the desired total luminous flux.
  • the invention is not limited to a particular ratio of constant current operated LEDs 3 to constant voltage operated LEDs 4; This depends in particular on the respectively selected LED type and the predetermined temperature range.
  • the optimum ratio can be determined by the above equation (3).
  • LED module 1 10, 100 or LED lamp or LED lamp and power source (s) 5 and voltage source (s) 6 forms the LED system S.
  • LEDs or LED groups can be operated at a single temperature level (for example on a printed circuit board) or at different temperature levels, the latter being achieved by arranging the LEDs or LED groups on different printed circuit boards and / or by cooling the LEDs or LED differently Groups can be realized.
  • the LED module 1, 10, 100 can be designed as a pure LED module or as an LED lamp or as an LED light.
  • the at least one first LED 3 is operated with constant current and the at least one second LED 4 is operated simultaneously with constant voltage.
  • the LED lamp or the LED light form an LED system S.
  • the jointly emitted luminous flux of the LEDs 3, 4 of the LED module 1, 10, 100 remains substantially constant over a predetermined temperature range.
  • a ratio of the constant-voltage operated LEDs 4 to the constant-current LEDs 3 of m: n, preferably 1: n, more preferably 1: 3, is generally obtained more preferably 1: 4.
  • the LEDs 3, 4 are preferably operated at the same temperature level, but can for example also be operated at different temperature levels. This can be done by arranging the LEDs 3, 4 or LED groups 101, 102 on one or different printed circuit boards or by different cooling of the LEDs 3, 4 or LED groups 101, 102.
  • one or more current sources 5 and voltage sources 6 may be provided, which together with the LED module 1, 10, 100 or the LED lamp or the LED light, the LED system S form.
  • the invention is not limited to the above embodiments and embodiments of the embodiments.
  • the embodiments including their properties and their features are arbitrarily combinable.

Claims (17)

  1. Module LED (1, 10, 100) comprenant un flux lumineux à stabilisation passive d'au moins deux LED (2, 3, 4), identiques
    caractérisé en ce que
    une source de courant (5) peut actionner au moins une première LED (3) avec une source de courant et une tension constante (6) pour faire fonctionner au moins une seconde diode (4) à tension constante,
    dans lequel la source de tension (6) et la source de courant (5) sont formées séparément l'une de l'autre et conçues de telle sorte qu'au moins une première LED (3) et au même moment au moins une deuxième LED (4) sont exploitées de telle sorte le flux lumineux des LED (3, 4) du module LED (1, 10, 100) est constant sur une plage de températures prédéterminée.
    Dont la relation entre le nombre d'au moins une première LED (3) et le nombre d'au moins une deuxième LED (4) et la relation de changement du flux lumineux des LEDs (3, 4) correspond à la plage de températures prédéterminée.
  2. Module LED (100) selon la revendication 1
    dans lequel le nombre d'au moins une LED (3) est différent du nombre d'au moins une seconde LED (4).
  3. Module LED (100) selon la revendication 1
    dans lequel le rapport entre le nombre d'au moins une LED (3) et le nombre d'au moins une seconde LED (4), correspond à m: n , de préférence I: n, en particulier 1: 3 ou 1: 4.
  4. Module LED (100) selon la revendication 1 ou 2,
    dans lequel au moins une première LED (3) et au moins une deuxième LED (4) ou un groupe de LEDs (101, 102) sont prévues une ou plusieurs fois pour atteindre un flux lumineux prédéterminé.
  5. Module LED (100) selon une des revendications précédentes,
    dans lequel les LED respectives (3,4) ont un rendement lumineux sensiblement linéaire en fonction de la courbe de températures.
  6. Module LED (1, 10, 100) selon une des revendications précédentes,
    dont les LEDs (3, 4) comprennent des LEDs vertes ou bleues.
  7. Module LED (1, 10, 100) selon une des revendications précédentes,
    dont le module de LED comprends différent types de LED pour obtenir une lumière LED de la couleur prévue (3, 4) et comprend pour chaque type de LED au moins une première LED correspondante (3) et au moins une deuxième LED correspondante (4), de façon à ce que le flux de lumière émis par les LEDs (4, 3) d'un type soit constamment et sensiblement au-dessus de la plage de températures prédéterminée pour chaque type de LED.
  8. Module LED (1, 10, 100) selon une des revendications précédentes,
    dans la direction d'émission des diodes électroluminescentes (3, 4), des particules d'un matériau de conversion de couleur et / ou de diffusion sont réparties sur la surface.
  9. Module LED (1, 10, 100) selon une des revendications précédentes,
    dans lequel les dites LED (3, 4) ou groupes de LED (101, 102) sont disposés selon des cartes de circuits imprimés différentes ou identiques.
  10. Module LED (1, 10, 100) selon une des revendications précédentes,
    dans lequel la plage de température prédéterminée correspond à la plage de fonctionnement des LED (3, 4).
  11. Procédé pour la stabilisation passive de sortie de lumière d'un module LED (1, 10, 100) comprenant les étapes suivantes :
    - Opération d'au moins une première LED (3) avec un courant constant d'une source de courant (5), et
    - Opération d'au moins une deuxième LED (4) avec un courant constant à une source de tension (6),
    dans lequel le fonctionnement d'au moins une deuxième LED (4) se produit simultanément
    dans lequel la source de tension (6) et la source de courant (5) sont formées séparément l'une de l'autre et conçues de telle sorte qu'au moins une première LED (3) et en même temps au moins une deuxième LED (4) peuvent être actionnées de telle sorte que le flux lumineux commun des LEDs (3, 4) du module de LEDs (1, 10, 100) reste sensiblement constant sur une plage de températures prédéterminée,
    dans lequel le rapport entre le nombre d'au moins une LED (3) au nombre d'au moins une seconde LED (4), correspond au rapport de la variation du flux lumineux de chaque LED (3, 4) au-dessus de la plage de températures prédéterminée.
  12. Procédé selon la revendication 11,
    dans lequel le rapport du nombre d'au moins une seconde LED (4) au nombre d'au moins une première LED (3) I: n est de préférence 1: 3, plus particulièrement 1: 4.
  13. Procédé selon la revendication 11 ou 12, dans lequel un point constant prédéterminé de fonctionnement du flux lumineux du module à LED (1, 10, 100) est réglé indépendamment de la température de fonctionnement et de la température ambiante par le courant de fonctionnement et/ou la tension de fonctionnement.
  14. Procédé selon l'une des revendications 11 à 13, dans lequel les diodes (3, 4) sont actionnés au même niveau de température.
  15. Lampe à LED ayant un module LED (1, 10, 100) selon l'une des revendications 1 à 10.
  16. Lampe à LED selon la revendication 15, dans lequel la lampe à LED est une lampe LED d'adaptation dont les pièces de raccordement mécanique et électrique correspondent à une lampe à halogène, fluorescentes compactes ou à incandescence.
  17. Lampe à LED ayant un module LED (1, 10, 100) selon l'une des revendications 1 à 10, ou une lampe à LED selon la revendications 15 ou 16
EP20110196004 2011-01-04 2011-12-29 Module DEL pour la stabilisation passive du flux lumineux Not-in-force EP2473007B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011002439A DE102011002439A1 (de) 2011-01-04 2011-01-04 LED-Modul zur passiven Lichtstromstabilisierung

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Publication Number Publication Date
EP2473007A1 EP2473007A1 (fr) 2012-07-04
EP2473007B1 true EP2473007B1 (fr) 2015-04-22

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DE102017223405A1 (de) * 2017-10-06 2019-04-11 Tridonic Gmbh & Co Kg Betriebsschaltung für ein LED-Leuchtmittel

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DE102004057379B3 (de) * 2004-11-26 2006-08-10 Schott Ag Temperaturstabilisiertes organisches Leuchtelement
KR20070077719A (ko) * 2006-01-24 2007-07-27 삼성전기주식회사 칼라 ｌｅｄ의 구동 장치
TWI345429B (en) * 2006-11-13 2011-07-11 Polytronics Technology Corp Light emitting diode apparatus
DE102008057347A1 (de) * 2008-11-14 2010-05-20 Osram Opto Semiconductors Gmbh Optoelektronische Vorrichtung
US8779685B2 (en) * 2009-11-19 2014-07-15 Intematix Corporation High CRI white light emitting devices and drive circuitry

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