EP3503688A1 - Phare - Google Patents

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Publication number
EP3503688A1
EP3503688A1 EP18214479.0A EP18214479A EP3503688A1 EP 3503688 A1 EP3503688 A1 EP 3503688A1 EP 18214479 A EP18214479 A EP 18214479A EP 3503688 A1 EP3503688 A1 EP 3503688A1
Authority
EP
European Patent Office
Prior art keywords
light
control unit
intensity
emitting diodes
maximum
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
Application number
EP18214479.0A
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German (de)
English (en)
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EP3503688B1 (fr
Inventor
Helge Hoffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tobuschat Hans Ulrich
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Tobuschat Hans Ulrich
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Publication date
Application filed by Tobuschat Hans Ulrich filed Critical Tobuschat Hans Ulrich
Publication of EP3503688A1 publication Critical patent/EP3503688A1/fr
Application granted granted Critical
Publication of EP3503688B1 publication Critical patent/EP3503688B1/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]
    • H05B45/20—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 headlamp, which is provided in particular for lighting a stage or a building facade.
  • Moving headlamp 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 such that the light generated by a light source is deflected in accordance with a control by a user. In addition, beam-shaped headlamps in the form of elongated multiple arrangements are known which contain a plurality of bulbs.
  • LEDs light-emitting diodes
  • groups of LEDs are increasingly being used, since they have the advantages of a long service life with low degradation of the brightness and high stability of the color locus over this service life with high efficiency (light output relative to other bulbs) the supplied electrical energy) can provide.
  • the efficiency of an LED decreases with increasing current through the LED.
  • the lifetime of the LED is defined by its junction temperature and the current through the LED and decreases as the junction temperature and current increase.
  • the amount of light emitted by the LED is also defined by its junction temperature and the current through the LED. This also reduces with increasing junction temperature, but increases with increasing current.
  • the maximum current through the LED is set to provide an acceptable trade-off between brightness and lifetime, which may vary depending on the application. For example, for architectural floodlights an optimization in terms of lifetime, and in stage headlights for short strobe inserts, an optimization in terms of brightness respectively. This maximum current is already defined in previously known headlamp designs in the development of the headlamp and is no longer changeable in the subsequent application.
  • the regulation of the light intensity which is usually required by the user is carried out, for example, via a modulation circuit in which the fixed maximum current of the LED is modulated by means of pulse width modulation.
  • a lighting device 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 comprising two switches connected to the plurality of light emitters and the control circuit for periodically and independently opening and closing the two switches, the controller having a variable address for identifying 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 be at the same frequency
  • the frequency is opened and closed according to independent duty cycles
  • said data flow portion comprises data for determining the respective duty cycles of the at least two different color LEDs.
  • a headlight in particular for lighting a stage or a building facade, which contains a plurality of light-emitting diodes as light sources.
  • the emitted light intensity is variable up to a maximum intensity by the plurality of light-emitting diodes. At least a part of the light-emitting diodes can be switched over between operation in a first mode with a first maximum intensity and operation in a second mode with a second maximum intensity deviating from the first maximum intensity.
  • a customary limitation of the maximum intensity and the associated maximum current is carried out in such a way that an adequate lifetime for the continuous operation with maximum intensity for the respective application is achieved.
  • the headlamp can be switched to a second mode in which the LED operated either with higher maximum intensity at the same reduced life and efficiency or with lower maximum intensity with increased lifetime and efficiency becomes.
  • Another example of the operation in the second mode with higher maximum intensity would be an architectural application in which a building is to be staged for a few seconds with bright flashes of light at the hour, but the headlamp is basically not operated with an increased maximum current.
  • the disadvantages occurring in the prior art of a reduced lifetime due to the permanently increased maximum current and increased energy consumption, since the efficiency of the LED could not be optimally utilized during the operating times with lower brightness are avoided according to the invention.
  • a second mode with lower maximum intensity could be optimized in terms of efficiency and lifetime of the LED as well as noise of the headlight. This would give the user in applications that allow a reduced maximum intensity, the possibility to reduce energy consumption and thus the energy costs and to reduce by the associated reduction of power loss, the volume of a fan used for example for cooling, which in turn the use of the headlamp in noise sensitive environments. Also for this interpretation of the second mode would be applications conceivable, which make only temporary use of the switch to this mode.
  • each light-emitting diode may be provided with a control unit. It is likewise conceivable to provide groups of light-emitting diodes with a control unit or to equip a light-emitting diode of a color characteristic with a control unit.
  • the maximum intensity is set the same individually or in groups.
  • each LED can be acted upon with respect to its maximum current in the second mode with an individual operating current or operating currents groupwise equal or approximately the same, so that the wear values are also approximately equal.
  • a circuit for pulse width modulation is provided as the modulation circuit, which circuit can be operated with respectively adjustable maximum current.
  • the color-true regulation of the illuminance is performed by a pulse width modulation circuit.
  • a modulation circuit allows a simple way to control the light intensity without causing color shifts.
  • the radiated light intensity can be controlled color-true, for example by means of a modulation circuit.
  • the radiated light intensity of the light-emitting diodes in each operating mode can be regulated up to the maximum intensity which can be set above the maximum current, without there being any color deviations with variation of the brightness.
  • a third operating mode may be provided beyond.
  • the operating modes may be e.g. be selected so that it can be switched between a normal operation, an operation with increased intensity and a stroboscopic operation.
  • control unit can be programmable via an interface with respect to the maximum intensity.
  • a programmable interface is provided as standard in headlamps, so that the intended maximum intensities and the associated maximum currents can also be configured programmably by a user.
  • the programmable interface can thus be used to select which maximum intensity or whichever associated maximum current is to be predetermined, as a result of which a plurality of modes can again be implemented.
  • the different modes can thus 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 which records an operating time in a reduced-life operating mode.
  • a monitoring unit which records an operating time in a reduced-life operating mode.
  • the headlight has a temperature sensor, which can be used to determine the maximum intensities.
  • the temperature of the light-emitting diode also has an influence on the service life, it is possible according to this procedure to adapt maximum currents of the light-emitting diode as a function of the temperature.
  • Fig. 1 is schematically illustrated a light emitting diode 5, which forms part of a headlight according to the invention. It goes without saying that an actual headlamp can comprise a plurality of such light-emitting diodes 5.
  • the light-emitting diode 5 is connected to a terminal with a potential which in Fig. 1 is denoted by V 1 .
  • the other terminal of the light emitting diode 5 is connected to a control unit whose first part is referred to as the first control unit 10, the second part as the second control unit 12 and the third part as the third control unit 14.
  • the outputs of the first, second and third control units 10, 12, 14 are in turn connected to a potential which in Fig. 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, 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 may include a resistor, so that by switching over by means of the interface 22 a corresponding operating mode is selectable, as described below with reference to FIG Fig. 3 is explained in more detail.
  • a voltage source may be attached, so that a maximum current which can be predetermined by means of the resistor flows through the light-emitting diode 5.
  • V 2 could correspond to a ground terminal, and V 1 be acted upon by a positive voltage.
  • the brightness of the light-emitting diode 5 can be adjusted via an analog current control or via a modulation circuit.
  • a second embodiment of the invention will be explained. It is again 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 current is predetermined 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 select which current should be preset, as a result of which a plurality of modes can again 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 quite also can be continuously changed from the outside.
  • Fig. 1 An exemplary construction of the first control unit 10 will be described Fig. 1 explained in more detail. It can be seen that the terminal connected to the light-emitting diode is connected to a resistor RI, which can be switched back and forth alternately 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 , Thus, in potential conditions as above in connection with Fig. 1 indicated only flow through the light emitting diode 5 flow when the switch is connected to V 2 . This corresponds to a pulse width modulated maximum current through the resistor RI, which can be adjusted via a further line 26 from the outside.
  • the first control unit 10, the second control unit 12 and the third control unit 14 are constructed identically, wherein only for each of the first, second and third control units 10, 12 and 14, a different resistance RI is provided, so that the light emitting diode 5 depending on the activated first , second or third control unit 10, 12 or 14 with a different maximum current is operable. In this maximum current, the light-emitting diode 5 is controlled by the pulse width modulation circuit 24 in accordance with their intensity.
  • the first control unit 10 adjusts the maximum current so that an adequate service life of the light-emitting diode 5 is achieved at the selected maximum intensity of the radiated light quantity.
  • This corresponds to the already known limitation of the operating current with respect to the 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 by means of the second control unit 12 is operated at the same time reduced lifetime.
  • operation in the second mode reduces the life of the light emitting diode, it can produce special lighting effects that can not be achieved with conventional headlights by only short-term activation.
  • An operation in the third mode can be done by means of the third control unit 14, for example to provide even higher or lower intensities.
  • the latter corresponds, for example, to operation with reduced energy consumption or operation with reduced noise due to lower cooling requirements, which is usually associated with reduced noise of a fan.
  • an intensity control can additionally be carried out up to the respective maximum current, for which, for example, a circuit for current limiting, a modulation circuit, in particular a circuit for pulse width modulation, or a combination of both circuits can be provided, which can be operated with the adjustable maximum current.
  • first, second and third control unit 10, 12 and 14 it is of course also possible to provide only two control units or more than three control units for a light-emitting diode.
  • the further operating modes can have a higher light intensity, so that special optical effects can be achieved in certain scenic illuminations.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
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 true EP3503688A1 (fr) 2019-06-26
EP3503688B1 EP3503688B1 (fr) 2022-08-03

Family

ID=64755158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18214479.0A Active EP3503688B1 (fr) 2017-12-21 2018-12-20 Phare

Country Status (3)

Country Link
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008157772A1 (fr) * 2007-06-20 2008-12-24 Eveready Battery Company, Inc. Dispositif lumineux avec contrôle de l'intensité lumineuse
EP2026634A1 (fr) * 2007-07-30 2009-02-18 Topco Technologies Corp. Lampe à diode électroluminescente et système d'illumination
US8058815B1 (en) * 2007-05-31 2011-11-15 Spectrum Illumination Co., Inc. LED drivers and driver controllers
US20140152187A1 (en) * 2012-12-05 2014-06-05 O2 Micro Inc. Circuits and methods for driving a light source
US9807839B1 (en) * 2013-10-09 2017-10-31 Musco Corporation Intermittent overdrive for sports lighting

Family Cites Families (5)

* 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
DE102011053493A1 (de) 2011-04-05 2012-10-11 Jb-Lighting Lichtanlagentechnik Gmbh Scheinwerfer mit Leuchtdioden
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP2026634A1 (fr) * 2007-07-30 2009-02-18 Topco Technologies Corp. Lampe à diode électroluminescente et système d'illumination
US20140152187A1 (en) * 2012-12-05 2014-06-05 O2 Micro Inc. Circuits and methods for driving a light source
US9807839B1 (en) * 2013-10-09 2017-10-31 Musco Corporation Intermittent overdrive for sports lighting

Also Published As

Publication number Publication date
DK3503688T3 (da) 2022-11-07
EP3503688B1 (fr) 2022-08-03
DE102017130862A1 (de) 2019-06-27

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