EP2757861B1 - LED-Beleuchtungsmodul mit verstellbarer Farbtemperatur - Google Patents

LED-Beleuchtungsmodul mit verstellbarer Farbtemperatur Download PDF

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Publication number
EP2757861B1
EP2757861B1 EP13151395.4A EP13151395A EP2757861B1 EP 2757861 B1 EP2757861 B1 EP 2757861B1 EP 13151395 A EP13151395 A EP 13151395A EP 2757861 B1 EP2757861 B1 EP 2757861B1
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EP
European Patent Office
Prior art keywords
led devices
lighting module
lighting
supply
chain
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EP13151395.4A
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English (en)
French (fr)
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EP2757861A1 (de
Inventor
Nicola Trivellin
Matteo Meneghini
Marco Ferretti
Gaudenzio Meneghesso
Enrico Zanoni
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Lightcube Srl
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Lightcube Srl
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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
    • 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

Definitions

  • the present invention refers to a lighting module, in particular a LED (Light Emitting Diode) lighting module.
  • a lighting module in particular a LED (Light Emitting Diode) lighting module.
  • chromatic properties of a light source are generally described by using certain characteristic measuring parameters, including colour temperature, colour rendering index and chromatic quality.
  • the colour temperature of a light source is a quantity (measured in K) indicative of the temperature a black body should have in order that the light radiation emitted by the latter appears chromatically as close as possible to the light radiation emitted by the source itself.
  • the colour rendering index of a light source is a quantity indicative of the capacity of said light source to illuminate a series of normalized colour samples in relation to the capacity of a black body to illuminate the same series of colour samples.
  • the colour rendering index (Ra) is indicated by a maximum number of 100 (perfect colour rendering capacity).
  • the colour rendering capacity of a filament light source incandescent bulb
  • the colour rendering capacity of a filament light source is typically 98-99, therefore very close to that of a black body.
  • the chromatic quality of a light source is represented by the distance between the chromatic coordinates of a light source and the coordinates of a black body, at the same colour temperature, in the CIE 1931 chromaticity diagram. The greater the distance of the black body from the chromatic coordinates, the lower the chromatic quality of the light source.
  • lighting devices or bodies which comprise LED lighting modules able to emit white light are widely used.
  • the most traditional lighting modules use LED devices with phosphor conversion system, typically characterised by an emission spectrum with peaks in the blue and yellow wavelengths.
  • the colour rendering index (below 90) of these lighting modules is wholly unsatisfactory, in particular as regards their use in interior lighting devices/systems.
  • LED lighting modules have been developed that are able to emit white light by varying the colour temperature of the light radiation emitted.
  • these lighting modules use phosphor LED devices characterised by an emission spectrum with emission peaks in the wavelengths typical of blue/violet and yellow, coupled with LED devices, typically of AlInGaP (Aluminium Indium Gallium Phosphide) type able to emit red-amber light.
  • LED devices typically of AlInGaP (Aluminium Indium Gallium Phosphide) type able to emit red-amber light.
  • the colour temperature of the light radiation emitted can be varied by appropriately modifying the ratio between the light flux generated by the phosphor LED devices and the light flux generated by the red/amber LED devices.
  • the lighting modules of this type have some drawbacks.
  • the light flux generated varies with the drive current in a different manner from the red/amber LED devices.
  • the two types of LED devices (phosphor white LEDs and red/amber LEDs) furthermore behave differently when a variation in temperature occurs.
  • the colour temperature of the light emitted can be varied by appropriately modifying the ratio between the light flux generated by LED devices of different types.
  • these lighting modules have a series of drawbacks.
  • the number of LED devices used is relatively high, generally double that of a single CCT solution, with consequent increase in costs and overall dimensions.
  • Patent documents US2006/109219A1 and DE102008057347A1 disclose known examples of lighting modules including current controlled chains of LED devices.
  • the main aim of the present invention is to provide a LED lighting module, which overcomes the drawbacks described above.
  • one object of the present invention is to provide a LED lighting module which allows variation of the chromatic characteristics of the light radiation emitted, in particular the colour temperature, in a relatively simple and effective manner.
  • a further object of the present invention is to provide a LED lighting module, in which the colour temperature of the light radiation emitted can be varied within a relatively wide range.
  • a further object of the present invention is to provide a LED lighting module, in which the colour temperature of the light radiation emitted can be varied, maintaining the colour rendering index and the light flux substantially unchanged.
  • a further object of the present invention is to provide a LED lighting module, which has a relatively simple and compact overall structure.
  • a further object of the present invention is to provide a LED lighting module, which has chromatic characteristics (colour temperature, colour rendering and chromatic coordinates) that are stable when the operating temperature varies.
  • a further object of the present invention is to provide a LED lighting module which is easy to produce industrially, at competitive costs.
  • the present invention relates to a lighting body or device as claimed in claim 10.
  • the present invention refers to a LED lighting module 1, particularly suitable for use in lighting bodies or lighting devices in general.
  • the lighting module 1 is operatively combined with a current generator 10 able to provide a power supply current I SUPPLY which is preferably constant over time.
  • the lighting module 1 comprises a pair of input terminals B 1 , B 2 connected in parallel to the current generator 10.
  • the latter can be integrated with the lighting module 1 or, preferably, be comprised in a control stage or device (not illustrated) operatively combined with the lighting module.
  • the lighting module 1 comprises a primary chain M 1 of LED devices, which is electrically connected in series to the current generator 10.
  • the lighting module 1 comprises first and second secondary chains N 1 , N 2 , ..., N H of LED devices, which are electrically connected in parallel to one another and are electrically connected in series to the current generator 10 and to the primary chain M 1 .
  • the lighting module 1 may comprise any positive integer number H of first and second secondary chains N 1 , N 2 , ..., N H .
  • the whole set of secondary chains of LED devices may be grouped according to the needs.
  • the first secondary chains may comprise the sole secondary chain N 1 while the second secondary chains may comprise the secondary chains N 2 , ..., N H .
  • the group of the first secondary chains might comprise a plurality of chains of LED device while the group of the second secondary chains might comprise a single chain of LED devices.
  • each of the secondary chains N 1 , N 2 , ..., N H comprises a different number i 1 , i 2 , ..., i H of LED devices.
  • all the secondary chains N 1 , N 2 , ..., N H may comprise a same number of LED devices.
  • the primary chain M 1 comprises a number of LED devices greater than that the number of LED devices of each of the first and second secondary chains N 1 , N 2 , ..., N H .
  • the lighting module 1 furthermore comprises one or more switches S, each of which is electrically connected in series to the LED devices of one of the first and second secondary chains N 1 , N 2 , ..., N H.
  • each switch S is inserted in one of the first and second secondary chains N 1 , N 2 , ..., N H and is electrically connected in series with the LED devices thereof.
  • the switches S regulate the flow of the supply current I SUPPLY , provided by the current generator 10, along a first and second lighting unit C 1 , C 2 .
  • the first lighting unit C 1 comprises the LED devices of the primary chain M 1 and the LED devices of the (one or more) first secondary chains (e.g. the secondary chain N 1 ) while the second lighting unit C 2 comprises the LED devices of the primary chain M 1 and the LED devices of the (one or more) second secondary chains (e.g. the secondary chains N 2 , ..., N H ). From the above, it is apparent that the actual number of LED devices of each lighting unit basically depends on the adopted grouping of the secondary chains of LED devices.
  • the switches S can advantageously regulate the passage of a current along the lighting units C 1 , C 2 , said current varying between zero and a maximum value (I SUPPLY ) set by the current generator 10.
  • the switches permit/prevent the flow of the supply current I SUPPLY along the first lighting unit C 1 and along a second lighting unit C 2 , in an alternate manner.
  • the switches S are thus capable to regulate the flow of the supply current I SUPPLY along alternative paths, which develop between the terminals B 1 and B 2 of the lighting module and which involve the LED devices of the first and second lighting units C 1 , C 2 , respectively.
  • Each of said paths identifies a different lighting unit C 1 , C 2 that is therefore able to emit its own characteristic light radiation when the supply current passes therethrough.
  • the number of switches S may be equal or smaller than the number of secondary chains N 1 , N 2 , ..., N H . In other words, the switches S may be inserted in all or in some of the secondary chains of the lighting module 1.
  • the switches S can consist, for example, of a simple MOSFET or BJT transistors.
  • the electronic switches S are operatively combined with electronic control means (not illustrated) able to provide control signals in current or in voltage, for example a signal of the square wave type with duty-cycle adjustable by means of a PWM type adjustment system.
  • electronic control means not illustrated
  • the switches S electrically connected to the first secondary chains (first lighting unit C 1 ) are controlled by a common first control signal V G1 while the switches S electrically connected to the second secondary chains (second lighting unit C 2 ) are controlled by a common second control signal V G2 .
  • the LED devices of the primary chain M 1 and secondary chains N 1 , N 2 , ..., N H are selected so that the LED devices, comprised in each of the above-mentioned lighting units, have complementary emission spectra, i.e. spectra having emission peaks at different sided wavelength ranges.
  • the primary chain M 1 can be provided with LED devices with emission peaks in the blue and yellow wavelengths and the secondary chains of each of the lighting units C 1 , C 2 can be provided with LED devices with emission peaks in the green and red wavelengths.
  • the spectrum of the radiation emitted by each lighting unit can be advantageously modulated so as to get as close as possible to the trend of the emission spectrum of a black body.
  • the LED devices of the primary chain M 1 and the first and second secondary chains N 1 , N 2 , ..., N H are selected so that the lighting module 1 emits a light radiation with a different colour temperature when the supply current I SUPPLY passes along each of the above-mentioned lighting units C 1 , C 2 .
  • the switches S are able to modulate the colour temperature of the light radiation emitted by selectively regulating the flow of the supply current I SUPPLY along the different lighting units C 1 , C 2 .
  • the LED devices of the primary chain M 1 and the LED devices of the first and second secondary chains N 1 , N 2 , ..., N H are selected so that the lighting module 1 emits a light radiation with constant light flux when the supply current I SUPPLY passes along each of the above-mentioned lighting units C 1 , C 2 .
  • the lighting module 1 emits a substantially uniform light flux.
  • the LED devices comprised in the lighting module 1 are solid-state devices based on properly chosen semiconductor materials or compounds, according to the needs.
  • the lighting module 1 comprises a single primary chain M 1 of LED devices, a single first secondary chain N 1 and single second secondary chain N 2 ( figures 2-3 ).
  • the primary chain M 1 is electrically connected in series to the current generator 10 while the first and second secondary chains N 1 , N 2 are connected in parallel to one another and in series to the current generator 10 and to the primary chain M 1 .
  • the secondary chains N 1 , N 2 comprise a different number of LED devices with respect to the primary chain M 1 , preferably a lower number of LED devices.
  • the lighting module 1 furthermore comprises a single electronic switch S, electrically connected in series with one of the secondary chains N 1 , N 2 (e.g. the secondary chain N 2 ).
  • the electronic switch S advantageously allows/prevents, in an alternate manner, the flow of the supply current I SUPPLY , provided by the current generator 10, along a first lighting unit C 1 , which comprises the LED devices of the primary chain M 1 and of the first secondary chain N 1 , and along a second lighting unit C 2 , which comprises the LED devices of the primary chain M 1 and of the second secondary chain N 2 .
  • the electronic switch S controls the flow of the supply current I SUPPLY so that it flows, in an alternate manner, through the lighting units C 1 or C 2 .
  • the first secondary chain N 1 comprises P 1 LED devices and the second secondary chain N 2 comprises P 2 LED devices, where P 1 is a number greater than P 2 .
  • Said solution is furthermore expedient as it reduces the fluctuations in voltage perceived by the current generator 10, when the supply current I SUPPLY is addressed from one lighting unit to another.
  • the electronic switch S consists of a MOSFET transistor, having drain and source terminals connected in series with the LED devices of the second secondary chain N 2 and the gate terminal connected to appropriate control means (not illustrated).
  • the switch S is advantageously driven in a conducting state (ON) or in an interdicting state (OFF) by a voltage signal V G of the square wave type, applied to the gate terminal.
  • the drive signal V G has an adjustable duty-cycle, for example by PWM type adjustment.
  • the switch S does not require a control circuit specifically designed for the purpose, since the switch S could be connected to PWM modulation (dimming) systems already present, as happens in numerous lighting plants and systems.
  • the switch S dissipates a negligible electrical power, not compromising the efficiency of the system.
  • decoupling means 15 are electrically connected between the switch S and the control means thereof, so as to electrically decouple the ground terminal(s) of the switch S from the ground terminal(s) of said control means.
  • the LED devices of the primary chain M 1 and secondary chains N 1 , N 2 are selected so that the lighting module 1 emits a light radiation with a first colour temperature T 1 when the supply current I SUPPLY passes along the first lighting unit C 1 , and a light radiation with a second colour temperature T 2 , different from T 1 , when the supply current I SUPPLY passes along the second lighting unit C 2 .
  • the LED devices of the primary chain M 1 and secondary chains N 1 , N 2 are selected so that the first colour temperature T 1 is below the second colour temperature T 2 .
  • the LED devices of the primary chain M 1 and secondary chains N 1 , N 2 are selected so that the colour rendering index is higher than 90 when the chains N 1 and N 2 are alternatively switched on.
  • the lighting module 1 emits the light radiation generated by the first lighting unit C 1 .
  • the voltage drop induced at its ends by the supply current I SUPPLY is lower than the one induced at the ends of the first secondary chain N 1 and in any case not sufficient to set the LED devices of the latter to the conducting state.
  • the supply current I SUPPLY which runs through the primary chain M 1 , is thus forced to flow through the second secondary chain N 2 .
  • the supply current I SUPPLY therefore passes along the second lighting unit C 2 , i.e. along a path that comprises the LED devices of the primary chain M 1 and of the second secondary chain N 2 .
  • the lighting module 1 emits the light radiation generated by the second lighting unit C 2 .
  • the human eye due to the phenomenon of persistence of vision, perceives a light stimulus mediated between the light radiations emitted by the two lighting units C 1 and C 2 over time.
  • the colour temperature of the light radiation emitted by the lighting module 1 can be advantageously modulated over time.
  • the radiation emitted by the lighting module 1 is thus characterised by a corresponding colour temperature value in the range T1-T2.
  • the colour temperature of the light radiation emitted by the lighting module 1 can thus be modulated in a simple effective manner, by adjustment of the duty-cycle of the signal V G , for example using open chain control means.
  • the primary chain M 1 of the lighting module 1 was produced by using 24 LED devices, connected in series.
  • 22 LED devices were used able to emit white light with colour temperature equal to 2700K, one LED device able to emit blue light, with emission peak at a wavelength between 460 nm and 480 nm, and one LED device able to emit green light, with emission peak at a wavelength between 520 nm and 530 nm.
  • the first secondary chain N 1 of the lighting module 1 comprises 8 LED devices, connected in series, with emission wavelength between 450 nm and 550 nm.
  • 1 LED device was used able to emit blue light, with emission peak at a wavelength between 460 nm and 480 nm, 2 LED devices able to emit royal blue light, with emission peak at a wavelength between 450 nm and 460 nm and 5 LED devices able to emit green light, with emission peak at a wavelength between 520 nm and 530 nm.
  • the secondary second chain N 2 of the lighting module 1 was produced using 5 LED devices, connected in series.
  • LED devices capable to emit white light with colour temperature equal to 2700 K and 1 LED device capable to emit red light, with emission peak at a wavelength between 600 nm and 650 nm were used.
  • a type N MOSFET depletion transistor was used for the switch S.
  • Modulation of the chromatic characteristics of the light radiation emitted by the lighting module 1 was performed by controlling the electronic switch S with a drive signal V G with amplitude of 10V, frequency 4kHz and duty-cycle varying between 0 and 100%.
  • the drive current I SUPPLY was maintained at a constant value of 350mA.
  • connection device 1 solves the drawbacks described in the known art, achieving the set objects.
  • the lighting module 1 allows the chromatic characteristics of the light radiation emitted to be varied in a simple effective manner.
  • the lighting module 1 therefore falls into class 1A for lighting devices, according to the classification of the UNI 10380 standard.
  • the lighting module 1 allows variation of the chromatic characteristics of the light radiation emitted using a relatively low number of LED devices and one single very cheap and compact current regulation device.
  • the lighting module 1 thus has a relatively simple compact overall structure, which is easy to produce at industrial level with relatively low industrial costs.

Landscapes

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

Claims (6)

  1. LED-Beleuchtungsmodul (1), umfassend:
    - eine primäre Kette (M1) von LED-Vorrichtungen, die mit einem Stromgenerator (10), der einen Versorgungsstrom (ISUPPLY) bereitstellt, in Reihe elektrisch verbunden ist;
    - eine erste sekundäre Kette (N1) und eine zweite sekundäre Kette (N2) von LED-Vorrichtungen, wobei die erste und die zweite sekundäre Kette parallel elektrisch miteinander verbunden sind und mit dem Stromgenerator (10) und mit der primären Kette (M1) in Reihe elektrisch verbunden sind;
    wobei die erste sekundäre Kette (N1) P1 LED-Vorrichtungen umfasst und die zweite sekundäre Kette (N2) P2 LED-Vorrichtungen umfasst, wobei P1 eine positive Zahl höher als P2 ist,
    wobei das Beleuchtungsmodul (1) einen einzelnen elektronischen Schalter (S) umfasst, der mit den LED-Vorrichtungen der zweiten sekundären Kette (N2) in Reihe elektrisch verbunden ist und abwechselnd den Fluss des Versorgungsstroms (ISUPPLY) entlang einer ersten Beleuchtungseinheit (C1), die die LED-Vorrichtungen der primären Kette (M1) und die LED-Vorrichtungen der ersten sekundären Ketten (N1) umfasst, und entlang einer zweiten Beleuchtungseinheit (C2), die die LED-Vorrichtungen der primären Kette (M1) und die LED-Vorrichtungen der zweiten sekundären Kette (N2) umfasst, ermöglicht, wobei der Versorgungsstrom (ISUPPLY) dazu gezwungen wird, entlang der ersten Beleuchtungseinheit (C1) zu fließen, wenn der elektronische Schalter in einen Sperrzustand (OFF) schaltet, und dazu gezwungen wird, entlang der zweiten Beleuchtungseinheit (C2) zu fließen, wenn der elektronische Schalter in einen Leitzustand (ON) schaltet,
    wobei das Beleuchtungsmodul (1) eine Lichtstrahlung mit einer ersten Farbtemperatur (T1) emittiert, wenn der Versorgungsstrom (ISUPPLY) entlang der ersten Beleuchtungseinheit (C1) fließt, und mit einer zweiten Farbtemperatur (T2) emittiert, wenn der Versorgungstrom (ISUPPLY) entlang der zweiten Beleuchtungseinheit (C2) fließt, wobei die erste Farbtemperatur (T1) höher als die zweite Farbtemperatur (T2) ist, wobei der elektronische Schalter durch ein Ansteuersignal (VG) angesteuert wird, das eine einstellbare Einschaltdauer aufweist, wobei die Farbtemperatur der durch das Beleuchtungsmodul (1) emittierten Lichtstrahlung durch Einstellen der Einschaltdauer des Ansteuersignals (VG) im Zeitablauf innerhalb eines Bereichs (T1-T2) von Werten zwischen der ersten und der zweiten Farbtemperatur (Tl, T2) moduliert wird.
  2. Beleuchtungsmodul nach Anspruch 1, dadurch gekennzeichnet, dass die in jeder der ersten und der zweiten Beleuchtungseinheit (C1, C2) umfassten LED-Vorrichtungen komplementäre Emissionsspektren aufweisen.
  3. Beleuchtungsmodul nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der geometrische Ort der Punkte (Tl, T2) der von dem Beleuchtungsmodul (1) emittierten Lichtstrahlung der Planckschen Schwarzkörper-Emissionskurve folgt.
  4. Beleuchtungsmodul nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Beleuchtungsmodul (1) eine Lichtstrahlung mit einem konstanten Lichtstrom emittiert, wenn der Versorgungsstrom (ISUPPLY) entlang jeder der ersten und der zweiten Beleuchtungseinheit (C1, C2) fließt.
  5. Beleuchtungsmodul nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die erste sekundäre Kette (N1) P1 LED-Vorrichtungen umfasst und die zweite sekundäre Kette (N2) P2 LED-Vorrichtungen umfasst, bei P1 = P2 + 1.
  6. Beleuchtungskörper oder -vorrichtung, dadurch gekennzeichnet, dass er bzw. sie ein Beleuchtungsmodul (1) nach einem oder mehreren der vorstehenden Ansprüche umfasst.
EP13151395.4A 2013-01-16 2013-01-16 LED-Beleuchtungsmodul mit verstellbarer Farbtemperatur Active EP2757861B1 (de)

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EP13151395.4A EP2757861B1 (de) 2013-01-16 2013-01-16 LED-Beleuchtungsmodul mit verstellbarer Farbtemperatur

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EP2757861B1 true EP2757861B1 (de) 2019-03-06

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1825717B1 (de) * 2004-11-23 2014-01-08 Koninklijke Philips N.V. Vorrichtung und verfahren zur regelung von farbe und farbtemperatur von durch eine digital gesteuerte beleuchtungsvorrichtung erzeugtem licht
EP1905102B1 (de) * 2005-06-28 2018-08-29 Seoul Viosys Co., Ltd Leuchtbauelement für wechselstrombetrieb
TWI433588B (zh) * 2005-12-13 2014-04-01 Koninkl Philips Electronics Nv 發光二極體發光裝置
DE102008057347A1 (de) * 2008-11-14 2010-05-20 Osram Opto Semiconductors Gmbh Optoelektronische Vorrichtung

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* Cited by examiner, † Cited by third party
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