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WO2011083117A2 - Procédé combiné pour faire fonctionner un élément luminescent électrique et circuit d'exploitation - Google Patents

Procédé combiné pour faire fonctionner un élément luminescent électrique et circuit d'exploitation Download PDF

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Publication number
WO2011083117A2
WO2011083117A2 PCT/EP2011/050088 EP2011050088W WO2011083117A2 WO 2011083117 A2 WO2011083117 A2 WO 2011083117A2 EP 2011050088 W EP2011050088 W EP 2011050088W WO 2011083117 A2 WO2011083117 A2 WO 2011083117A2
Authority
WO
WIPO (PCT)
Prior art keywords
led
dimming
pulse
current
amplitude
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.)
Ceased
Application number
PCT/EP2011/050088
Other languages
German (de)
English (en)
Other versions
WO2011083117A3 (fr
Inventor
Michael Zimmermann
Reinhold Juen
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.)
Tridonic GmbH and Co KG
Tridonic AG
Original Assignee
Tridonic GmbH and Co KG
Tridonic AG
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 Tridonic GmbH and Co KG, Tridonic AG filed Critical Tridonic GmbH and Co KG
Priority to EP11700393.9A priority Critical patent/EP2522199B1/fr
Priority to DE112011100189T priority patent/DE112011100189A5/de
Publication of WO2011083117A2 publication Critical patent/WO2011083117A2/fr
Publication of WO2011083117A3 publication Critical patent/WO2011083117A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback
    • 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
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the present invention generally relates to lamp operating devices or systems and methods by means of which light sources such as light emitting diodes (LEDs) can be operated.
  • LEDs light emitting diodes
  • a particular field of application of the present invention is street lighting.
  • street lighting there is generally the problem that, due to different regulations regarding the distribution of light intensity at the bottom, the manufacturer of street lamps has to make very many different adjustments with regard to the light sources.
  • mechanical adjustments are currently being made, for example between the reflector and the light source, in particular the high-pressure lamp.
  • An LED street lamp has advantages in this regard in that at least two different LED module chains can be provided, and the light intensity distribution on the ground can be achieved by selectively dimming the at least two different LED modules.
  • Light chain modules can be adjusted.
  • a part of the previously made mechanical change for adjustment to local regulations is shifted to the field of lighting control, which brings logistical advantages.
  • LED street lights are operated via a pulse-modulated control of the LEDs, for example a PWM (Pulse Width Modulation) control.
  • PWM Pulse Width Modulation
  • this calibration takes place at the factory by reducing the maximum value of the duty cycle of the P M drive to less than 100%. In other words, for calibration purposes, the maximum turn-on duration of the pulse-modulated current to supply the LEDs is below 100%.
  • a problem that occurs is that when delivering such LED street lights typically one of the two LED chains is limited to maximum operation, which is below the maximum possible 100% duty cycle. In operation, when the street lamp is now dimmed to a low brightness, it is known that there may be a critical flicker in the generated light or critical stroboscopic effects.
  • a high dimming level range above 10% pure PWM (pulse width modulation) dimming is provided to prevent color change from occurring.
  • a mixed PWM amplitude dimming is provided in a third dimming phase between 2% and 10%.
  • the wavelength and color of the LEDs can be kept constant in the wide upper dimming range between 2% and 10%.
  • the LEDs are switched off thanks to amplitude dimming without the flickering or stroboscopic effects caused by PWM modulation in this area.
  • both techniques are used in such a way that the dimming behavior runs between 2% and 10% continuously and without noticeable step changes.
  • the invention is based on the object to improve a method and system for lighting described above.
  • the invention is based on the object that an LED-based lighting means, in particular LED street lights, can be configured such that negative effects such as flickering of the generated light or stroboscopic effects are as much as possible mitigated.
  • This object is solved by the features of the independent claims.
  • the dependent claims represent further embodiments of the invention. According to a first aspect of the invention, a method is proposed for operating at least one
  • Illuminant in particular a light emitting diode (LED) of an LED module.
  • the light emitting diode is operated by a pulse modulated current, wherein the turn-off duration of the pulse-modulated current is controllable by an external dimming command, and the amplitude of the pulse-modulated current is adjustable depending on a calibration.
  • this method is capable of dimming LED modules or LED chains in each case both by pulse width modulation (PWM) as well as amplitude. Furthermore, this method is capable of receiving incoming external dimming commands (from a bus such as DALI, motion sensors,
  • the switch-off duration of the pulse-modulated current may be controllable as a function of measurement data acquired externally by a sensor.
  • the amplitude of the pulse modulated current may be adjustable depending on a long term calibration.
  • the amplitude of the pulse modulated current can be used to set a maximum brightness to compensate for
  • Aging of the LED or to change the color temperature of the light generated by the LED be adjustable.
  • a plurality of LED modules or LEDs can be operated by a plurality of LED modules.
  • Each LED module can be supplied with a pulse modulated current, with the amplitude of the pulse modulated current being individually adjustable for each LED module.
  • the various pulse modulated currents for driving the individual LED modules may be modulated to be simultaneously set to the zero value.
  • the positive edge of the pulse modulated current for operating one of the LED modules may be offset in time from the positive edge of the pulse modulated current to operate another one of the LED modules.
  • At least two LED modules can be operated in such a way that a single dimming command results in the simultaneous dimming of the at least two LED modules (4, 5).
  • Another aspect of the invention relates to methods for operating at least two separately controllable LED modules, each having at least one LED, wherein the current amplitude of at least two LED modules are different, preferably over a dimming period constant values, and
  • an operating device for operating at least one luminous means, in particular a light-emitting diode (LED) of an LED module.
  • LED light-emitting diode
  • the operating device has a supply input for supplying the operating device with electrical energy, a data input for receiving control or dimming commands, at least one output for supplying an LED module, at least one LED module supply unit for supplying the LED module with a pulse modulated current, and a control unit for determining the turn-off duration of the pulse-modulated current in response to an external dimming command, and for determining the amplitude of the pulse-modulated current as a function of a calibration.
  • Another aspect of the invention relates to a method for driving at least one LED
  • the dimming area is subdivided into at least two subregions in which the routing is performed in a different manner from the variation of the amplitude or a parameter of a pulse modulation of the current through the LED (s) or a combination thereof
  • a control takes place by changing the current amplitude
  • the operating device may have a direct current source for providing a constant direct current starting from a supply voltage provided at the supply input. Furthermore, the operating device may have a memory for storing calibration data.
  • Fig. 2 shows a schematic representation of a
  • FIG. 3 shows an embodiment of a schematic block diagram for an operating circuit for operating two LED modules
  • Fig. 4 shows a representation of the temporal
  • FIG. 5 shows an illustration of the chronological progression of the pulse modulation of the supply current for the LED modules or the switching on and off of the pulse-modulated current as a function of dimming
  • FIG. 6 shows a representation of the chronological progression of the pulse modulation of the supply current for the LED Modules or the switching on and off of the pulse-modulated current as a function of dimming
  • FIG. 8 shows an illustration of the time profile of the pulse modulation of the supply current for the LED modules in the case of a 100% dimming according to the invention.
  • Fig. 1 shows an embodiment of the invention with reference to a street lamp 1.
  • the street lamp 1 includes by default a lamppost 3, which is firmly connected to the ground 12 or with a road surface.
  • a lamp 2 is mounted in the upper region of the lamppost 3.
  • the lamp 2 is anchored at the upper end of the cylindrical lamppost 3.
  • the luminaire 2 comprises at least one luminous means, for example in the form of a light-emitting diode (LED), wherein the LED can be an inorganic and an organic LED.
  • the luminaire 2 preferably comprises at least two lighting means in the form of two LED modules 4, 5, which are each supplied with power via a power supply line 8.
  • a control line 9 leads to the LED modules 4, 5 for external control of the operation and, for example, the brightness of the LED modules 4, 5.
  • the LED street lamp 1 is equipped with two different light cones, which can be individually mixed with each other.
  • the LED modules 4, 5 preferably produce different illuminations on the floor 12.
  • a first LED module 4 illuminates a first area 6 on the floor and a second area 7 ⁇ , 7 , ⁇ on a second area.
  • the area illuminated by the second LED module may consist of two subregions 7 ⁇ , 7 , ⁇ , which are respectively positioned on both sides of the first area 6. These three areas may overlap slightly to ensure continuous lighting on the floor.
  • the lighting system 10 shows a lighting system 10 with two street lamps 1, 1, wherein a region of the road surface 12 is illuminated both by the one 1 and by the second street lamp 1 ⁇ .
  • the number of street lamps can be greater than two.
  • the lighting system 10 further includes a data bus 11.
  • An example of such a bus 11 is a DALI (Digital Addressable Lighting Interface) bus for implementing the DALI protocol for controlling lighting equipment.
  • the respective control lines 9, 9 X of the street lamps 1, 1 x are connected to the data bus 11, so that the light distribution or the brightness of the illumination system 10 can be controlled centrally by a control unit 14, for example.
  • the control can be performed by any unit connected to the data bus 11.
  • At least one sensor 13 may be provided.
  • the sensor 13 may, for example, be a motion sensor, a daylight sensor, or a rain sensor. It can also be a photosensor for detecting aging effects or
  • the decisive factor is that the sensor is network-capable, and transmits via the data bus 11 measurement data for a specific property of the environment of the illumination system 10, such as the temperature, the brightness or a movement.
  • These measurement data are processed by the central control unit 14, which in turn can send out corresponding dimming commands via the data bus 11.
  • a plurality of sensors 13 are provided, so that the outgoing control unit 14 has several measurement data available.
  • the sensor 13 may itself convert and transmit the measurement data in dimming commands.
  • the measurement data are recorded directly from the individual street lamps 1, 1, evaluated, and converted into a suitable control of the LED modules 4, 5.
  • FIG. 3 shows a schematic representation of an operating device according to the invention for LEDs or an operating device for at least two LED channels.
  • the operating device 20 of the luminaire 2 comprises a control unit 21, a first module supply unit 24, a second module supply unit 25, a memory 22 and a DC power source 26.
  • the operating device has two inputs, namely a first input 28 for the power supply via the Power supply line 8 and a second input 29 for receiving data that are sent via the line 9 and the data bus 11. These data are preferably control or dimming commands for controlling the LEDs or their brightness. Alternatively or additionally, the operating device 20 may also receive other types of data, such as measurement data from a sensor 13 or calibration data. According to further embodiments, the operating device 20 is designed such that it can also send itself data such as confirmation data or status data via the line 9 in the bus 11.
  • the central unit of the operating device 20 is the control unit, which processes the data received via the second input 29 and performs corresponding control of the LED modules 4, 5. The supply of the LED modules 4, 5 via the corresponding first module supply unit 24 and the second module supply unit 25th
  • the operating device 20 can control several channels independently of each other.
  • Each channel can control one LED module. These may be, for example, LED arrays with blue LEDs that emit white light using a color conversion agent. It is also possible that each channel drives a different LED color. It should be pointed out in advance that the inventive method is by no means limited to two channels. Rather, it is possible that the method involves three or more channels. For three channels it is e.g. It is conceivable that one channel controls red LEDs, one channel green LEDs and one channel blue LEDs.
  • the DC power source 26 is supplied in operation via the first input 28 from the AC mains with AC voltage. At its output, the DC power source 26 provides a constant DC current 10 available.
  • the DC power source 26 preferably comprises a rectifier for rectifying the mains voltage, a voltage converter for reducing the rectified mains voltage, and a converter for generating the direct current 10.
  • the memory 22 contains data which are preferably used to calibrate the luminaire 2.
  • This data can be up refer to the aging process of the LEDs, to a maximum brightness value not to be exceeded, or, for example, to a desired adjustment of the color temperature of the generated light.
  • Preferably, such data relate to one of the LED modules 4, 5, or to all the LED modules of the luminaire.
  • the data can be stored in the memory 22 in the factory in advance. However, the data can also be stored in operation via the line 9 from the control unit 21 in the memory 22.
  • control unit 21 is now able either to read the calibration data stored in the memory 22 or also to receive calibration data via the line 9 and the bus 11.
  • the control unit 21 calculates accordingly
  • FIG. 4 shows an illustration of the time profile of the amplitude of the supply current for the LED modules 4, 5.
  • the amplitude 10.4 of the pulse-modulated current 14 for the first LED module 4 corresponds to the amplitude of the direct current 10 provided by the DC power source 26. That is to say, the first LED module 4 is not to be calibrated, or that its maximum brightness does not have to be reduced.
  • the maximum amplitude 10.5 of the pulse-modulated current 15 for the second LED module 5 is smaller than the rated direct current 10. Accordingly, the LEDs 23 of the second LED module 5 become in the same dimming conditions generate darker light than that of the first LED module 4.
  • the first module supply unit 24 is supplied by the direct current 10 and controlled by the control unit 21.
  • the module supply unit 24 receives from the control unit 21 information regarding the maximum amplitude 10.4 of the pulse-modulated current 14, and accordingly generates a pulse-modulated current 14, shown in FIG. 5, having a maximum amplitude 10.4 and a duty cycle T1 / T0 ,
  • the LED module 4 is operated by this current 14, and consists of a plurality of LEDs 23, which are combined by parallel and / or series connection.
  • the structure and operation of the second module supply unit 25 and the second LED module 5 are similar to those of the first module supply unit 24 and the first LED module 4th
  • FIG. 6 shows a further embodiment of the invention or a representation of the time profile of the modulation of the supply current 14, 15 for the LED modules 4, 5.
  • the two LED modules 4, 5 and the two channels are PWM-operated in this embodiment, each with a duty cycle of 30%.
  • the maximum amplitude of the pulse modulated current I4 X , 15 of the two channels is set to the values 10.4, 10.5 according to a calibration.
  • the PWM pulses of the two channels are timed to each other such that a PWM pulse of the first channel is in the PWM off period of the second channel. This means that the one or more LEDs connected to or driven by the first channel will light up when the one or more LEDs of the second channel are turned off.
  • a PWM pulse of the first channel is preferably in the middle of the PWM off period of the second channel.
  • the positive edge of a PWM pulse of the first channel may coincide in time with the negative edge of a PWM pulse of the second channel.
  • no light H is generated during 70% of the time.
  • illumination H is now generated only during 40% of the time.
  • the switch-off times of the total lighting are reduced from 70% to 40% of the PWM period.
  • the PWM pulses of the two channels are timed to each other so that a PWM pulse of the first channel is possible in the PWM AusschaltZeitdauer the second channel. As shown in FIGS.
  • the duty ratio remains at 100%, and the maximum amplitude of the PWM current is lowered to 80% of the rated current 10.
  • the adaptation to the local conditions is achieved according to the invention by pure amplitude dimming.
  • the effect is achieved that at 100% dimming operation optimum light quality in terms of 100% duty cycle is present.
  • negative effects such as flickering or stroboscopic effects are alleviated because in such a low dimming range the duty cycle according to the invention is greater than the duty cycle of the prior art.
  • Another advantage is that now the two or even more LED channels or LED modules 4, 5 of a single lamp 2 need not be controlled with different PWM values to possibly make a different calibration can, but as a single control channel can be treated. This is made possible by the fact that, starting now from the possibly differently set amplitude values 10.4, 10.5, the PWM duty cycles are changed simultaneously for all channels. Thus, for example, with a single DALI command the concurrent dimming of multiple channels of the same luminaire can be achieved.
  • incoming dimming commands are always converted only in one change of the duty cycle (PWM dimming), although the drive circuit can drive at least two LED module strings both by amplitude dimming and by PWM dimming.
  • the PWM dimming between 0 and 100% duty cycle is reserved for the conversion of incoming dimming commands. All other adaptation effects (aging compensation, adjustment to local regulations, etc.) are achieved by amplitude dimming. In particular with regard to the compensation of aging effects of the LEDs, it can be provided that all LED module chains in the delivered state are first operated with an amplitude value below 100% nominal value 10 of the current, in order to achieve a sufficient margin to compensate for aging effects.
  • the two different LED channels controlled by the control unit can each be the same color, in particular white. However, it can also be different colors, so that one
  • Color compensation by means of amplitude dimming takes place while the actual dimming in the sense of converting from external dimming commands via PWM dimming is based on a duty cycle of 100%.

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

Abstract

L'invention concerne un procédé pour faire fonctionner au moins un élément luminescent, notamment une diode luminescente (LED) (23) d'un module de LED (4, 5), la diode luminescente (23) fonctionnant au moyen d'un courant modulé par impulsions (I4, I5), la durée de coupure (T2) du courant modulé par impulsions (I4, I5) pouvant être commandée par une instruction de gradation externe, et l'amplitude (I0,4, I0,5) du courant modulé par impulsions pouvant être réglée en fonction d'un étalonnage.
PCT/EP2011/050088 2010-01-05 2011-01-05 Procédé combiné pour faire fonctionner un élément luminescent électrique et circuit d'exploitation Ceased WO2011083117A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11700393.9A EP2522199B1 (fr) 2010-01-05 2011-01-05 Procédé combiné pour faire fonctionner un élément luminescent électrique et circuit d'exploitation
DE112011100189T DE112011100189A5 (de) 2010-01-05 2011-01-05 Kombiniertes Verfahren zum Betreiben eines elektrischen Leuchtmittels sowie Betriebsschaltung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010000672.6 2010-01-05
DE102010000672A DE102010000672A1 (de) 2010-01-05 2010-01-05 Kombiniertes Verfahren zum Betreiben eines elektrischen Leuchtmittels sowie Betriebsschaltung

Publications (2)

Publication Number Publication Date
WO2011083117A2 true WO2011083117A2 (fr) 2011-07-14
WO2011083117A3 WO2011083117A3 (fr) 2012-05-03

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EP (1) EP2522199B1 (fr)
DE (2) DE102010000672A1 (fr)
WO (1) WO2011083117A2 (fr)

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Publication number Publication date
EP2522199B1 (fr) 2018-03-14
DE102010000672A1 (de) 2011-07-07
DE112011100189A5 (de) 2012-10-18
EP2522199A2 (fr) 2012-11-14
WO2011083117A3 (fr) 2012-05-03

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