EP3503688B1 - Phare - Google Patents

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Publication number
EP3503688B1
EP3503688B1 EP18214479.0A EP18214479A EP3503688B1 EP 3503688 B1 EP3503688 B1 EP 3503688B1 EP 18214479 A EP18214479 A EP 18214479A EP 3503688 B1 EP3503688 B1 EP 3503688B1
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EP
European Patent Office
Prior art keywords
light
intensity
operating mode
emitting diodes
maximum
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Application number
EP18214479.0A
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German (de)
English (en)
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EP3503688A1 (fr
Inventor
Helge Hoffmann
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Tobuschat Hans Ulrich
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Tobuschat Hans Ulrich
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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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour 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
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs

Definitions

  • the invention relates to a spotlight which is intended in particular for illuminating a stage or a building facade.
  • Movable headlight heads are known from the general state of the art, which are often referred to as moving heads in English usage. Such headlights are used, for example, in scenic lighting and are used there as so-called wash lights or projectors. Furthermore, mirror scanners are known in which a movable mirror can be controlled in such a way that the light generated by an illuminant is deflected according to a control by a user. In addition, bar-shaped headlights are known in the form of elongated multiple arrangements that contain a large number of light sources.
  • the first-mentioned spotlights are usually used to illuminate a stage, an event location or the like
  • the last-mentioned spotlights are used in architectural lighting to achieve optical effects on buildings or building facades.
  • LEDs Light-emitting diodes
  • groups of LEDs are increasingly being used as light sources in these headlights, since, compared to other light sources, they have the advantages of a long service life with little degradation in brightness and high stability of the color point over this service life, while at the same time being highly efficient (light output based on the supplied electrical energy) can offer.
  • the relationships described below can be established for LEDs.
  • the efficiency of an LED decreases as the current through the LED increases.
  • the service life of the LED is defined by its junction temperature and the current through the LED and reduces with increasing junction temperature and current.
  • the amount of light emitted by the LED is also defined by its junction temperature and the current through the LED. This also decreases with increasing junction temperature, but increases with increasing current intensity.
  • the maximum current through the LED is usually set in such a way that an acceptable compromise between brightness and service life is achieved, which can vary depending on the application. For example, architectural spotlights can be optimized in terms of service life, and stage spotlights for short stroboscopic use can be optimized in terms of brightness take place. In the case of previously known headlight designs, this maximum current is already defined during the development of the headlight and can no longer be changed in later use.
  • a device for lighting comprising a plurality of light emitters in two different colors, which are coupled to a circuit having a current source and a common potential reference, a driver for the light emitters, which comprises two switches connected to the plurality of light emitters and connected to the circuit and to respective current paths of the light emitters, respectively, a controller for periodically and independently opening and closing the two switches, the controller having a variable address to identify a respective portion of an input data stream assigned thereto, each light emitter being an LED and the controller generates a plurality of PWM signals having a uniform frequency, each signal corresponding to a respective color of the plurality of LEDs of different colors, each said PWM signal causing each of the two switches to operate at the uniform frequency is opened and closed according to independent duty cycles, and wherein said data flow portion includes
  • a circuit including a bridge circuit, a converter and a controller which receives power from the first and second power lines of a switch and produces a rectified voltage.
  • the switch is able in a first state in which the switch was conducting current to the first power line but not the second power line, operating in a second state in which the switch was conducting current to the second power line but not the first power line, and in a third state in which the switch was conducting current to both first and also leads to the second power line.
  • a lighting device with a user adjustable intensity control is known.
  • the device has a user-operable switch to turn the light source on and off and also to adjust the intensity of the light beam.
  • the US 8,058,815 B1 describes LED drivers and associated controllers that are designed to control high-power LEDs. Using the LED drivers, a current boost can be achieved for momentary illumination of the LEDs at levels that exceed their maximum continuous current rating.
  • the EP 2 026 634 A1 describes an LED with a current control circuit that can output different control currents to an LED array according to the flashing times of a switch to modulate the intensity of the light emitted by the LED array.
  • a headlight according to claim 1 is provided.
  • the maximum intensity and the associated maximum current are limited in such a way that an appropriate service life for permanent operation with maximum intensity is achieved for the respective application.
  • This corresponds to the already known limitation of the operating current with regard to normal operation.
  • the headlight can be switched to a second mode in which the light-emitting diode is operated either with a higher maximum intensity with a simultaneously reduced service life and efficiency or with a lower maximum intensity with a simultaneously increased service life and efficiency becomes.
  • operation in the second mode with a higher maximum intensity and the associated higher maximum current reduces the service life of the light-emitting diode, it can produce special lighting effects that cannot be achieved with conventional headlights by merely activating it for a short time. For example, at the end of an event, a concluding sequence could be shown with significantly increased intensity, which leaves a special impression on visitors. If operation in this second mode is limited to such short-term sequences, the expected overall reduction in service life is typically not significant. In other Use cases it would be possible to provide a correspondingly higher light intensity, for example in strong sunlight.
  • a second mode with a lower maximum intensity could be optimized with regard to the efficiency and service life of the light-emitting diode and with regard to the noise development of the headlight.
  • this would give the user the opportunity to reduce the energy consumption and thus the energy costs and, through the associated reduction in the power loss, to reduce the volume of a fan used for cooling, for example, which in turn would make the use of the headlight easier in noise-sensitive environments.
  • applications would also be conceivable which make use of the switchover to this mode only occasionally.
  • the lighting of a play for quieter scenes that require less light intensity and tolerate less background noise could be temporarily switched to this more efficient mode with less noise.
  • a more significant color locus shift by changing the maximum current occurs at most at low intensities when changing modes on, wherein within an operating mode, brightness control can be done true to color, for example, by means of the aforementioned modulation circuit.
  • each light-emitting diode can be provided with a control unit. It is also conceivable to provide groups of light-emitting diodes with a control unit or to equip light-emitting diodes with a color characteristic with a control unit.
  • the maximum intensity is set to be the same for groups. Accordingly, operating currents can be chosen to be the same or approximately the same for groups, so that the wear values are also approximately the same.
  • a circuit for pulse width modulation is provided as the modulation circuit in the first operating mode and in the second operating mode, which circuit can be operated with an adjustable maximum current in each case.
  • the color-accurate control of the illuminance is carried out by a pulse width modulation circuit.
  • a Modulation circuitry allows the light intensity to be regulated in a simple manner without color shifts occurring.
  • the radiated light intensity can be controlled true to color, for example, by means of a modulation circuit.
  • the emitted light intensity of the light-emitting diodes can thus be regulated in every operating mode up to the maximum intensity that can be set via the maximum current, without color deviations occurring when the brightness is varied.
  • a third operating mode can also be provided.
  • the operating modes can thus be selected, for example, in such a way that it is possible to switch between normal operation, operation with increased intensity and stroboscopic operation.
  • control unit can be programmable via an interface with regard to the maximum intensity.
  • a programmable interface is provided as standard in headlights, so that the maximum intensities provided and the maximum currents associated therewith can also be designed to be programmable by a user.
  • the programmable interface can thus be used to select which maximum intensity or which associated maximum current is to be specified, which in turn means that a number of modes can be implemented.
  • the different modes can therefore not only be understood as discrete values of the maximum current of the light-emitting diodes, but can also be continuously changed from the outside.
  • control unit is equipped with a monitoring unit that records an operating time in an operating mode with a reduced service life.
  • a definable threshold is reached, switching to an operating mode with a shorter service life can be prevented.
  • this embodiment provides for a monitoring unit to be integrated into the control unit, so that the operating time in the operating mode with a reduced service life is recorded. It can thus be prevented, for example, that the second operating mode activated too frequently or accidentally, which would result in a significant reduction in service life.
  • the headlight has a temperature sensor that can be used to determine the maximum intensities.
  • a light-emitting diode 5 is shown schematically, which forms part of a headlight according to the invention. It goes without saying that an actual headlight can comprise a large number of such light-emitting diodes 5 .
  • the light-emitting diode 5 is connected to a terminal with a potential that is in 1 is denoted by V 1 .
  • the other terminal of the light-emitting diode 5 is connected to a control unit, the first part of which is referred to as the first control unit 10 , the second part of which is referred to as the second control unit 12 and the third part of which is referred to as the third control unit 14 .
  • the outputs of the first, second and third control unit 10, 12, 14 are in turn connected to a potential in 1 is denoted by V 2 .
  • the first control unit 10, the second control unit 12 and the third control unit 14 are each connected to an input signal 16, 18 and 20, which in turn are fed by a programmable interface 22.
  • the programmable interface 22 can thus select one of the first, second or third control units 10, 12 or 14 by means of corresponding control signals, so that this branch is activated.
  • Each of the first, second or third control units 10, 12 or 14 can specify a maximum current with which the light-emitting diode 5 is operated between the potential difference between the potentials V 1 and V 2 .
  • each of the first, second or third control units 10, 12 or 14 can therefore contain a resistor, so that a corresponding operating mode can be selected by switching using the interface 22, as below with reference to FIG 3 is explained in more detail.
  • a voltage source can be attached between the potentials V 1 and V 2 , for example, so that a maximum current that can be predetermined by means of the resistor flows through the light-emitting diode 5 .
  • V 2 could correspond to a ground connection, and a positive voltage could be applied to V 1 .
  • the brightness of the light-emitting diode 5 can be adjustable for each operating mode via an analog current control or via a modulation circuit.
  • a light-emitting diode 5 is shown, which forms part of a headlight according to the invention.
  • the light-emitting diode 5 is connected to the control unit 10, which is constructed here as an adjustable current source, so that the current flowing between the points V 1 and V 2 is specified by means of the input signal 16.
  • the input signal 16 can in turn be fed by a programmable interface 22 .
  • the programmable interface 22 can thus use appropriate control signals to select which current is to be specified, as a result of which a plurality of modes can in turn be implemented.
  • the different modes can thus not only be understood as discrete values of the operating current of the light-emitting diode 5, but can definitely also be changed continuously from the outside.
  • the terminal connected to the light-emitting diode is connected to a resistor RI, which can be switched back and forth between V 1 and V 2 via a switch SI by means of a pulse width modulation circuit 24, which is fed by the signal 16 of the programmable interface 22 .
  • a pulse width modulation circuit 24 which is fed by the signal 16 of the programmable interface 22 .
  • the first control unit 10, the second control unit 12 and the third control unit 14 have an identical structure, with only a different resistance RI being provided for each of the first, second and third control units 10, 12 and 14, so that the light-emitting diode 5 depending on the activated first , second or third control unit 10, 12 or 14 can be operated with a different maximum current. At this maximum current, the intensity of the light-emitting diode 5 is correspondingly controlled by means of the pulse width modulation circuit 24 .
  • the first control unit 10 can correspond to the normal operation of the light-emitting diode 5 .
  • the second control unit 12 can have a higher light intensity, which can be generated via a lower resistance RI. However, statistically speaking, this is associated with a shorter service life.
  • the third control unit 14 can in turn have an even lower internal resistance, so that when it is activated via the signal 20, a kind of stroboscopic illumination can be achieved by means of the light-emitting diode 5.
  • the second control unit 12 and the third control unit 14 are constructed identically to the first control unit 10 except for the value of the resistor RI.
  • the maximum current is set via the first control unit 10 such that an appropriate service life of the light-emitting diode 5 is achieved at the selected maximum intensity of the amount of light emitted.
  • This corresponds to the already known limitation of the operating current with regard to normal operation by means of the resistor RI.
  • the headlight can be switched to a second mode in which the light-emitting diode with a higher maximum intensity is activated by means of the second control unit 12 is operated with a reduced service life at the same time.
  • operation in the second mode reduces the service life of the light-emitting diode, it can produce special lighting effects that cannot be achieved with conventional headlights if it is only activated for a short time. If the operation in the second mode is limited to such short-term sequences, the reduction in the service life of the light-emitting diode 5 that is to be expected overall is typically not significant.
  • An operation in the third mode can take place by means of the third control unit 14, for example in order to provide even higher or also lower intensities. The latter corresponds, for example, to operation with reduced energy consumption or operation with reduced noise development due to a lower cooling requirement, which is usually associated with reduced noise from a fan.
  • an intensity control can also be carried out up to the respective maximum current, for which purpose a modulation circuit, in particular a circuit for pulse width modulation, or a combination of the modulation circuit and a circuit for current limitation, which can be operated with the adjustable maximum current, can be provided.
  • a modulation circuit in particular a circuit for pulse width modulation, or a combination of the modulation circuit and a circuit for current limitation, which can be operated with the adjustable maximum current, can be provided.
  • the first control unit 10 is shown, which is expanded by a monitoring unit 28 .
  • the monitoring unit 28 is connected to a current signal 30, for example.
  • the monitoring unit 28 can, of course, also be provided with further control signals.
  • the monitoring unit 28 signals at its output 34, for example, that a maximum operating time has been reached in the intended operating state.
  • the control unit may be according to FIG 4 be extended by a temperature sensor, which is also used to monitor the lifetime can be used.
  • first, second and third control units 10, 12 and 14 shown it is of course also possible to provide only two control units or more than three control units for a light-emitting diode. It is thus possible to switch from normal operation using first control unit 10 to at least one additional operating mode using second control unit 12 or to a third operating mode using third control unit 14 .
  • the other operating modes can have a higher light intensity, so that special optical effects can be achieved with certain scenic lighting.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Claims (9)

  1. Projecteur, en particulier pour l'éclairage d'une scène ou d'une façade de bâtiment, qui contient une pluralité de diodes électroluminescentes (5) comme sources lumineuses, au moins une partie des diodes électroluminescentes (5) pouvant être commutée entre un fonctionnement dans un premier mode de fonctionnement avec une première intensité maximale ainsi qu'un fonctionnement dans un deuxième mode de fonctionnement avec une deuxième intensité maximale différente de la première intensité maximale, plusieurs unités de commande (10 ; 12 ; 14), la pluralité d'unités de commande (10 ; 12 ; 14) prédéfinissant pour chaque mode de fonctionnement un courant maximal pouvant être sélectionné par commutation pour régler l'intensité maximale respective, caractérisé en ce que la pluralité d'unités de commande (10 ; 12 ; 14) effectuent chacune avec un circuit de modulation une commande d'intensité de la partie des diodes électroluminescentes (5) jusqu'au courant maximal respectif et une luminosité des diodes électroluminescentes (5) peut être réglée avec le circuit de modulation respectif à l'intérieur d'un mode de fonctionnement respectif.
  2. Projecteur selon la revendication 1, dans lequel chaque diode électroluminescente (5) est munie d'une unité de commande (10 ; 12 ; 14), des groupes de diodes électroluminescentes (5) sont munis d'une unité de commande (10 ; 12 ; 14) ou des diodes électroluminescentes (5) d'une caractéristique de couleur sont munies d'une unité de commande (10 ; 12 ; 14).
  3. Projecteur selon la revendication 1 ou 2, dans lequel, à l'intérieur d'un mode de fonctionnement, une régulation de la luminosité s'effectue en respectant la couleur.
  4. Projecteur selon l'une quelconque des revendications 1 à 3, dans lequel, pour commander l'intensité lumineuse émise, le circuit de modulation respectif est un circuit de modulation de largeur d'impulsion (24).
  5. Projecteur selon l'une quelconque des revendications 1 à 4, dans lequel il est en outre prévu un troisième mode de fonctionnement.
  6. Projecteur selon l'une quelconque des revendications 1 à 5, dans lequel les modes de fonctionnement sont choisis de manière à pouvoir être commutés entre un fonctionnement normal, un fonctionnement à intensité accrue, un fonctionnement à consommation d'énergie réduite, un fonctionnement à bruit réduit ou un fonctionnement stroboscopique.
  7. Projecteur selon l'une des revendications 1 à 6, dans lequel les unités de commande respectives (10 ; 12 ; 14) sont équipées chacune d'une unité de surveillance (28), l'unité de surveillance (28) enregistrant une durée de fonctionnement dans un mode de fonctionnement à durée de vie réduite.
  8. Projecteur selon la revendication 7, dans lequel, lorsqu'un seuil définissable de la durée de fonctionnement est atteint, il est possible d'empêcher une commutation dans un mode de fonctionnement ayant une durée de vie plus faible.
  9. Projecteur selon l'une quelconque des revendications 1 à 8, comprenant un capteur de température pouvant être utilisé pour déterminer les intensités maximales.
EP18214479.0A 2017-12-21 2018-12-20 Phare Active EP3503688B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017130862.8A DE102017130862A1 (de) 2017-12-21 2017-12-21 Scheinwerfer

Publications (2)

Publication Number Publication Date
EP3503688A1 EP3503688A1 (fr) 2019-06-26
EP3503688B1 true EP3503688B1 (fr) 2022-08-03

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EP18214479.0A Active EP3503688B1 (fr) 2017-12-21 2018-12-20 Phare

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EP (1) EP3503688B1 (fr)
DE (1) DE102017130862A1 (fr)
DK (1) DK3503688T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3813487B1 (fr) 2019-10-25 2021-12-15 Lumileds LLC Module d'éclairage à del pour véhicule automobile

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6016038A (en) 1997-08-26 2000-01-18 Color Kinetics, Inc. Multicolored LED lighting method and apparatus
US20090256483A1 (en) * 2006-06-08 2009-10-15 Lutron Electronics Co., Inc. Load Control Device Having a Visual Indication of an Energy Savings Mode
US8058815B1 (en) * 2007-05-31 2011-11-15 Spectrum Illumination Co., Inc. LED drivers and driver controllers
WO2008157772A1 (fr) * 2007-06-20 2008-12-24 Eveready Battery Company, Inc. Dispositif lumineux avec contrôle de l'intensité lumineuse
CN101358719B (zh) * 2007-07-30 2012-01-04 太一节能系统股份有限公司 发光二极管灯源及照明系统
DE102011053493A1 (de) 2011-04-05 2012-10-11 Jb-Lighting Lichtanlagentechnik Gmbh Scheinwerfer mit Leuchtdioden
US9402286B2 (en) * 2012-12-05 2016-07-26 O2Micro Inc Circuits and methods for driving a light source
US9807839B1 (en) * 2013-10-09 2017-10-31 Musco Corporation Intermittent overdrive for sports lighting
DE102014118440A1 (de) * 2014-12-11 2016-06-16 Siteco Beleuchtungstechnik Gmbh Verfahren und Schaltung zur Versorgung eines LED-Leuchtmittels
JP6827460B2 (ja) * 2015-07-10 2021-02-10 シグニファイ ホールディング ビー ヴィＳｉｇｎｉｆｙ Ｈｏｌｄｉｎｇ Ｂ．Ｖ． 照明装置用コントローラ

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Publication number Publication date
EP3503688A1 (fr) 2019-06-26
DK3503688T3 (da) 2022-11-07
DE102017130862A1 (de) 2019-06-27

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