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WO2016092405A1 - Luminaire à couleur réglable avec intensité constante - Google Patents

Luminaire à couleur réglable avec intensité constante Download PDF

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Publication number
WO2016092405A1
WO2016092405A1 PCT/IB2015/059168 IB2015059168W WO2016092405A1 WO 2016092405 A1 WO2016092405 A1 WO 2016092405A1 IB 2015059168 W IB2015059168 W IB 2015059168W WO 2016092405 A1 WO2016092405 A1 WO 2016092405A1
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WIPO (PCT)
Prior art keywords
variable resistance
leds
resistance assembly
string
luminaire
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PCT/IB2015/059168
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English (en)
Inventor
Solomon Raju CHINNAM
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Signify Holding BV
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Philips Lighting Holding BV
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Application filed by Philips Lighting Holding BV filed Critical Philips Lighting Holding BV
Publication of WO2016092405A1 publication Critical patent/WO2016092405A1/fr
Anticipated expiration legal-status Critical
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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

Definitions

  • the present invention is directed generally to lighting control . More particularly, various inventive methods and apparatus disclosed herein relate to luminaires that are adjustable to emit light of different correlated color temperatures (“CCT”) with consistent intensity.
  • CCT correlated color temperatures
  • LEDs light-emitting diodes
  • Functional advantages and benefits of LEDs include high energy conversion and optical efficiency, durability, lower operating costs, and many others. Recent advances in LED technology have provided efficient and robust ful l-spectrum lighting sources that enable a variety of lighting effects in many applications.
  • Some of the fixtures embodying these sources feature a lighting module, including one or more LEDs capable of producing different colors, e.g., red, green, and blue, as well as a processor for independently controlling the output of the LEDs in order to generate a variety of colors and color-changing lighting effects, for example, as discussed in detail in U .S. Patent Nos. 6,016,038 and 6,211,626, incorporated herein by reference.
  • Existing luminaires may be capable of being “tuned” to emit various colors, such as variations of white having different CCTs.
  • Some such luminaires may arrange one or more light sources (such as LEDs) in a color mixing chamber, and/or may have phosphor applied to the one or more light sources in order to achieve particular CCTs.
  • Control systems associated with such luminaires may be relatively complex and/or expensive because they are often implemented using microcontrol lers and/or integrated circuits ("IC"). They may also include open or closed feedback loops in order to achieve CCT consistency. However, while CCT consistency may be achieved, there may be loss of output lumens across CCTs.
  • a luminaire may include one or more strings of LEDs operably coupled with one or more LED drivers.
  • the luminaire may be equipped with various mechanisms for applying variable resistance (e.g., in discrete steps or continuously) to one or more dimming interfaces of the one or more LED drivers.
  • Each of the one or more LED drivers may map (e.g., in a lookup table) each level of applied resistance to a different current output to be provided to a respective string of LEDs.
  • each level of resistance applied by the variable resistance assembly maps to a different set of current outputs to be provided to the strings of LEDs.
  • Each set of current outputs may be selected to cause the strings of LEDs to collectively emit light having particular CCT while maintaining relatively consistent intensity (i.e. lumen output) across multiple sets of current outputs.
  • a luminaire may include: a housing; an LED driver with a dimming interface contained within the housing; a string of LEDs operably coupled with an output of the LED driver; a user interface element accessible from an exterior of the housing; and a variable resistance assembly contained in the housing and operably coupled with the dimming interface.
  • the variable resistance assembly may include a plurality of potential configurations in which the variable resistance assembly applies a predetermined resistance to the dimming interface.
  • the variable resistance assembly may be toggled between its potential configurations in response to physical actuation of the mechanical user interface element. I n response to each resistance applied by the variable resistance assembly in each respective potential configuration of the variable resistance assembly, the LED driver may provide current in a different manner to the string of LEDs.
  • the variable resistance assembly includes a bank of resistors. In various embodiments, the variable resistance assembly includes a potentiometer. In various embodiments, each of the predetermined resistances provided by the variable resistance assembly may be selected to cause the string of LEDs to emit light having a different CCT. In various embodiments, the variable resistance assembly may include a switch mechanically coupled with the user interface element. In various versions, physical actuation of the user interface element may cause the switch to transition from electrically coupling a first set of one or more resistors of the variable resistance assembly with the dimming interface to electrically coupling a second set of one or more resistors of the variable resistance assembly with the dimming interface. In various versions, the switch may be a dual pole switch or dual rail step switch.
  • the LED driver may provide a pulse width modulated current to the string of LEDs in response to resistance applied by the variable resistance assembly in at least one potential configuration of the variable resistance assembly.
  • the string of LEDs may include a first string of LEDs operably coupled with a first output of the LED driver, and the luminaire further comprises a second string of LEDs.
  • the second string of LEDs may be operably coupled with a second output of the LED driver.
  • the LED driver may provide current in a different manner to the second string of LEDs.
  • the second string of LEDs may be operably coupled with an output of a second LED driver.
  • a dimming interface of the second LED driver may be operably coupled with the variable resistance assembly.
  • the second LED driver may provide current in a different manner to the second string of LEDs.
  • the term "LED” should be understood to include any electroluminescent diode or other type of carrier injection/junction- based system that is capable of generating radiation in response to an electric signal.
  • the term LED includes, but is not limited to, various semiconductor-based structures that emit light in response to current, light emitting polymers, organic light emitting diodes (OLEDs), electroluminescent strips, and the like.
  • LED refers to light emitting diodes of all types (including semi-conductor and organic light emitting diodes) that may be configured to generate radiation in one or more of the infrared spectrum, ultraviolet spectrum, and various portions of the visible spectrum (generally including radiation wavelengths from approximately 400 nanometers to approximately 700 nanometers).
  • Some examples of LEDs include, but are not limited to, various types of infrared LEDs, ultraviolet LEDs, red LEDs, blue LEDs, green LEDs, yellow LEDs, amber LEDs, orange LEDs, and white LEDs (discussed further below).
  • LEDs may be configured and/or controlled to generate radiation having various bandwidths (e.g., full widths at half maximum, or FWHM) for a given spectrum (e.g., narrow bandwidth, broad bandwidth), and a variety of dominant wavelengths within a given general color categorization.
  • bandwidths e.g., full widths at half maximum, or FWHM
  • FWHM full widths at half maximum
  • an LED configured to generate essentially white light may include a number of dies which respectively emit different spectra of electroluminescence that, in combination, mix to form essentially white light.
  • a white light LED may be associated with a phosphor material that converts electroluminescence having a first spectrum to a different second spectrum.
  • electroluminescence having a relatively short wavelength and narrow bandwidth spectrum "pumps" the phosphor material, which in turn radiates longer wavelength radiation having a somewhat broader spectrum.
  • an LED does not limit the physical and/or electrical package type of an LED.
  • an LED may refer to a single light emitting device having multiple dies that are configured to respectively emit different spectra of radiation (e.g., that may or may not be individually controllable).
  • an LED may be associated with a phosphor that is considered as an integral part of the LED (e.g., some types of white LEDs).
  • the term LED may refer to packaged LEDs, non-packaged LEDs, surface mount LEDs, chip-on-board LEDs, T-package mount LEDs, radial package LEDs, power package LEDs, LEDs including some type of encasement and/or optical element (e.g., a diffusing lens), etc.
  • the term "light source” should be understood to refer to any one or more of a variety of radiation sources, including, but not limited to, LED-based sources (including one or more LEDs as defined above), incandescent sources (e.g., filament lamps, halogen lamps), fluorescent sources, phosphorescent sources, high-intensity discharge sources (e.g., sodium vapor, mercury vapor, and metal halide lamps), lasers, other types of electroluminescent sources, pyro-luminescent sources (e.g., flames), candle-luminescent sources (e.g., gas mantles, carbon arc radiation sources), photo-luminescent sources (e.g., gaseous discharge sources), cathode luminescent sources using electronic satiation, galvano-luminescent sources, crystallo- luminescent sources, kine-luminescent sources, thermo-luminescent sources, triboluminescent sources, sonoluminescent sources, radioluminescent sources, and luminescent polymers.
  • LED-based sources
  • a given light source may be configured to generate electromagnetic radiation within the visible spectrum, outside the visible spectrum, or a combination of both.
  • a light source may include as an integral component one or more filters (e.g., color filters), lenses, or other optical components.
  • filters e.g., color filters
  • lenses e.g., prisms
  • light sources may be configured for a variety of applications, including, but not limited to, indication, display, and/or illumination.
  • illumination source is a light source that is particularly configured to generate radiation having a sufficient intensity to effectively illuminate an interior or exterior space.
  • sufficient intensity refers to sufficient radiant power in the visible spectrum generated in the space or environment (the unit “lumens” often is employed to represent the total light output from a light source in all directions, in terms of radiant power or "luminous flux”) to provide ambient illumination (i.e., light that may be perceived indirectly and that may be, for example, reflected off of one or more of a variety of intervening surfaces before being perceived in whole or in part).
  • spex should be understood to refer to any one or more frequencies (or wavelengths) of radiation produced by one or more light sources.
  • the term “spectrum” refers to frequencies (or wavelengths) not only in the visible range, but also frequencies (or wavelengths) in the infrared, ultraviolet, and other areas of the overall electromagnetic spectrum.
  • a given spectrum may have a relatively narrow bandwidth (e.g., a FWHM having essentially few frequency or wavelength components) or a relatively wide bandwidth (several frequency or wavelength components having various relative strengths). It should also be appreciated that a given spectrum may be the result of a mixing of two or more other spectra (e.g., mixing radiation respectively emitted from multiple light sources).
  • color is used interchangeably with the term “spectrum.”
  • the term “color” generally is used to refer primarily to a property of radiation that is perceivable by an observer (although this usage is not intended to limit the scope of this term). Accordingly, the terms “different colors” implicitly refer to multiple spectra having different wavelength components and/or bandwidths. It also should be appreciated that the term “color” may be used in connection with both white and non-white light.
  • color temperature generally refers to a particular color content or shade (e.g., reddish, bluish) of white light.
  • the color temperature of a given radiation sample conventionally is characterized according to the temperature in degrees Kelvin (K) of a black body radiator that radiates essentially the same spectrum as the radiation sample in question.
  • Black body radiator color temperatures generally fall within a range of approximately 700 degrees K (typically considered the first visible to the human eye) to over 10,000 degrees K; white light generally is perceived at color temperatures above 1,500-2000 degrees K.
  • Lower color temperatures generally indicate white light having a more significant red component or a "warmer feel,” while higher color temperatures generally indicate white light having a more significant blue component or a "cooler feel.”
  • fire has a color temperature of approximately 1,800 degrees K
  • a conventional incandescent bulb has a color temperature of approximately 2848 degrees K
  • early morning daylight has a color temperature of approximately 3,000 degrees K
  • overcast midday skies have a color temperature of approximately 10,000 degrees K.
  • a color image viewed under white light having a color temperature of approximately 3,000 degree K has a relatively reddish tone
  • the same color image viewed under white light having a color temperature of approximately 10,000 degrees K has a relatively bluish tone.
  • lighting unit is used herein to refer to an apparatus including one or more light sources of same or different types ("lighting unit” will be used predominantly herein).
  • a given lighting unit may have any one of a variety of mounting arrangements for the light source(s), enclosure/housing arrangements and shapes, and/or electrical and mechanical connection configurations. Additionally, a given lighting unit optionally may be associated with (e.g., include, be coupled to and/or packaged together with) various other components (e.g., control circuitry) relating to the operation of the light source(s).
  • LED-based lighting unit refers to a lighting unit that includes one or more LED-based light sources as discussed above, alone or in combination with other non LED-based light sources.
  • a “multi-channel” lighting unit refers to an LED-based or non LED-based lighting unit that includes at least two light sources configured to respectively generate different spectrums of radiation, wherein each different source spectrum may be referred to as a "channel" of the multi-channel lighting unit.
  • controller is used herein generally to describe various apparatus relating to the operation of one or more light sources.
  • a controller can be implemented in numerous ways (e.g., such as with dedicated hardware) to perform various functions discussed herein.
  • a "processor” is one example of a controller which employs one or more microprocessors that may be programmed using software (e.g., microcode) to perform various functions discussed herein.
  • a controller may be implemented with or without employing a processor, and also may be implemented as a combination of dedicated hardware to perform some functions and a processor (e.g., one or more programmed microprocessors and associated circuitry) to perform other functions. Examples of controller components that may be employed in various embodiments of the present disclosure include, but are not limited to, conventional microprocessors, application specific integrated circuits (ASICs), and field-programmable gate arrays (FPGAs).
  • ASICs application specific integrated circuits
  • FPGAs field-programmable gate arrays
  • a processor or controller may be associated with one or more storage media (generically referred to herein as "memory,” e.g., volatile and non-volatile computer memory such as RAM, PROM, EPROM, and EEPROM, floppy disks, compact disks, optical disks, magnetic tape, etc.).
  • the storage media may be encoded with one or more programs that, when executed on one or more processors and/or controllers, perform at least some of the functions discussed herein.
  • Various storage media may be fixed within a processor or controller or may be transportable, such that the one or more programs stored thereon can be loaded into a processor or controller so as to implement various aspects of the present invention discussed herein.
  • program or “computer program” are used herein in a generic sense to refer to any type of computer code (e.g., software or microcode) that can be employed to program one or more processors or controllers.
  • the term "addressable” is used herein to refer to a device (e.g., a light source in general, a lighting unit or fixture, a controller or processor associated with one or more light sources or lighting units, other non-lighting related devices, etc.) that is configured to receive information (e.g., data) intended for multiple devices, including itself, and to selectively respond to particular information intended for it.
  • a device e.g., a light source in general, a lighting unit or fixture, a controller or processor associated with one or more light sources or lighting units, other non-lighting related devices, etc.
  • information e.g., data
  • the term “addressable” often is used in connection with a networked environment (or a "network,” discussed further below), in which multiple devices are coupled together via some communications medium or media.
  • one or more devices coupled to a network may serve as a controller for one or more other devices coupled to the network (e.g., in a master/slave relationship).
  • a networked environment may include one or more dedicated controllers that are configured to control one or more of the devices coupled to the network.
  • multiple devices coupled to the network each may have access to data that is present on the communications medium or media; however, a given device may be "addressable" in that it is configured to selectively exchange data with (i.e., receive data from and/or transmit data to) the network, based, for example, on one or more particular identifiers (e.g., "addresses") assigned to it.
  • network refers to any interconnection of two or more devices (including controllers or processors) that facilitates the transport of information (e.g., for device control, data storage, data exchange, etc.) between any two or more devices and/or among multiple devices coupled to the network.
  • information e.g., for device control, data storage, data exchange, etc.
  • networks suitable for interconnecting multiple devices may include any of a variety of network topologies and employ any of a variety of communication protocols.
  • any one connection between two devices may represent a dedicated connection between the two systems, or alternatively a non-dedicated connection.
  • a non-dedicated connection may carry information not necessarily intended for either of the two devices (e.g., an open network connection).
  • various networks of devices as discussed herein may employ one or more wireless, wire/cable, and/or fiber optic links to facilitate information transport throughout the network.
  • Fig. 1 illustrates an example luminaire configured with selected aspects of the present disclosure.
  • Fig. 2 depicts schematically how multiple strings of LEDs may be selectively driven based on variable resistance applied to LED drivers, in accordance with various embodiments.
  • FIG. 3 schematically depicts an example electrical circuit arrangement configured with selected aspects of the present disclosure, in accordance with various embodiments.
  • Fig. 4 schematically depicts another example variable resistance assembly, in accordance with various embodiments.
  • FIG. 5 schematically depicts another example electrical circuit arrangement configured with selected aspects of the present disclosure, in accordance with various embodiments.
  • Fig. 6 depicts an example method of assembling a luminaire configured with selected aspects of the present disclosure, in accordance with various embodiments.
  • Existing luminaires may be capable of being “tuned” to emit various colors, such as variations of white having different CCTs.
  • Some such luminaires may arrange one or more light sources (such as LEDs) in a color mixing chamber, and/or may include phosphor applied to the one or more light sources in order to achieve particular CCTs.
  • Control systems associated with such luminaires may be relatively complex and/or expensive because they are often implemented using microcontrollers and/or integrated circuits ("IC"). They may also include open or closed feedback loops in order to achieve CCT consistency. However, while CCT consistency may be achieved, there may be loss of output lumens across CCTs.
  • a luminaire 100 may include a housing 102, a mount 104, and one or more strings of LEDs 106a-b.
  • luminaire 100 is an LED- based floodlight that may be planted into a surface such as the ground using mount 104.
  • each string 106 of LEDs may include more or less than sixteen individual LEDs, and different strings may include different numbers of LEDs.
  • luminaire 100 may include more or less than two strings of LEDs.
  • luminaire 100 may be transitioned between a plurality of preset configurations in which strings of LEDs 106a-b collectively emit light having various desired CCTs, and yet with relatively constant intensity across CCTs.
  • luminaire 100 may be used as a floodlight to illuminate an exterior of a building.
  • luminaire 100 may be manually adjusted to emit white light at various stepped CCT intervals between approximately 3,000 degrees K and approximately 5,700 degrees K. This enables luminaire 100 to illuminate the building with various degrees of warmth.
  • luminaire 100 may be manually adjusted between multiple configurations, and in each configuration, strings of LEDs 106a-b may collectively emit light at a particular CCT.
  • luminaire 100 may be toggled between the following configurations: a first at which luminaire 100 emits light at 3,000 degrees K; a second at which luminaire 100 emits light at 3,500 degrees K; a third at which luminaire 100 emits light at 4,000 degrees K; a fourth at which luminaire 100 emits light at 4,500 degrees K; a fifth at which luminaire 100 emits light at 5,000 degrees K; and a sixth at which luminaire 100 emits light at 5,500 degrees K.
  • the lumen output across all CCT configurations may, however, remain relatively consistent.
  • Each stri ng of LEDs 106 may be selected to emit light havi ng particu lar characteristics.
  • LEDs on first string 106a may be selected from a first LED bin and/or may be selected based on havi ng a particular flux.
  • LEDs on second string 106b may be selected from a second LED bin and/or may be selected based on having a particular fl ux. I n this manner, light emitted by one string 106 i n isolation may have a different CCT than light emitted by another string i n isolation.
  • each individua l string 106 may be powered with cu rrent i n a different amou nt or manner. How current is applied to each string individual ly to achieve a desired combined CCT may be determi ned at the factory, and wil l be described below.
  • Lumi naire 100 may be toggled between preset configu rations in various ways.
  • a user interface element 108 may be physical ly actuated between multiple positions in order to toggle lu minaire 100 between mu lti ple present configu rations.
  • user interface element 108 is a screw that may be actuated by inserted a screwdriver (flat head in this exam ple) and rotating the screwdriver to rotate the screw between multiple potential positions as shown by the arrow.
  • Each potential position of the screw may correspond to one of the plurality of preset configurations of l umi naire 100, and thus may correspond to a desired CCT output.
  • user interface element 108 may be coupled with various mechanisms that are configu red to vary a resistance applied to one or more LED drivers. By varying resistance applied to one or more LED drivers, a set of cu rrent outputs necessary to achieve a particular com bined CCT may be provided to the stri ngs 106a-b.
  • user interface element 108 is depicted as a flat head screw on the front of housing 102 in Fig. 1, this is not mea nt to be li miting.
  • Various other mechanisms may be employed, and may be employed at various other locations of housing 102.
  • various other types of screws such as Phil lips, hex (e.g., Al len), fluted, and so forth, may be em ployed instead .
  • other physical actuators may be employed, such as knobs, dials, nuts, bolts, sliders, and so forth.
  • a physical actuator may be instal led at any location on housing 102, such as on top, bottom, on a side, on a back, on mount 104, and so forth.
  • the physical actuator employed as user interface element 108 may be readily accessible from the outside of housing 102, so that it can be easily actuated by a technician.
  • a tool such as a screw driver or Allen wrench may be required to actuate user interface element 108, which may prevent or at least dissuade u nauthorized persons from attempting to adjust light output by luminaire 100.
  • Fig. 2 and Table 1 below demonstrate how light emitted by individual strings of LEDs may be adjusted in response to changes in resistance applied by a variable resistance assembly, in order to achieve a combined light output having a desired CCT at each discrete step.
  • a luminaire 200 is schematical ly depicted that is similar to luminaire 100, except there are four strings of LEDs 206a-d, rather than two.
  • Two LED drivers 210a-b are operably coupled variously with the four strings of LEDs 206a-d in order to drive the strings of LEDs 106a-d with various currents.
  • first and third strings of LEDs, 206a and 206c are selected (e.g., LED bins/flux selected) to emit light with a measured CCT of 3,000 degrees K
  • second and fourth strings of LEDs, 206b and 206d are selected to emit light with a measured CCT of 5,700 degrees K.
  • Table 1, below demonstrates how each of the strings of LEDs 206a-d may be driven with different currents to emit collective light 219 having various desired CCTs, all while maintaining relatively consistent intensity.
  • first and third strings 206a and 206c may be provided with proportionally high current (1.02 amps).
  • Second and fourth strings 206b and 206d may be provided with proportionally low current (0.22 amps).
  • the combined light CCT is relatively warm, at 3,000 degrees K. This may be achieved, for instance, by transitioning variable resistance assembly 218 to a particular configuration that causes it to apply a particular resistance to LED drivers 210a-b, thereby causing LED drivers to output the currents described above.
  • first and third strings 206a and 206c may be provided with proportionally low current (0.10 amps).
  • Second and fourth strings 206b and 206d may be provided with proportionally high current (1.02 amps).
  • the combined light CCT is relatively cool, at 5,500 degrees K. This may be achieved, for instance, by transitioning variable resistance
  • the “cool” strings of LEDs (206b and 206d) may be provided proportional ly greater current, and the “warm” strings of LEDs (206a and 206d) may be provided with proportionally less current. And vice versa. And no matter the CCT achieved in the combined light emitted by all four strings 206a-d, the lumens output remains relatively steady between 11520 and 11040 lumens. Such a smal l variation may be relatively imperceptible to the human eye.
  • first string 306a is powered by a first LED driver 310a.
  • Second string 306b is powered by a second LED driver 310b.
  • first and second LED drivers 310a-310b each has a single output (connected to a single string 306).
  • first and second LED drivers 310a-310b each has a single output (connected to a single string 306).
  • an LED driver may include two outputs, or "channels.” Each output or channel may be operably coupled with a string of LEDs. Such "dual channel” LED drivers may be programmable, e.g., at the factory, so that each channel/output behaves the same or differently depending on the resistance applied to a dimming interface. Referring back to Fig. 3, both LED drivers 310 are dimmable, and so first LED driver 310a includes a first dimming interface 312a and second LED driver 310b includes a second dimming interface 312b.
  • variable resistance assembly 318 may be electrically coupled with leads 314 of both the dimming interfaces 312a and 312b. As described previously, variable resistance assembly 318 may be operable to vary an amount of resistance (or impedance, as the case may be) that is applied to dimming interfaces 312a and 312b. For example, in Fig. 3, variable resistance assembly 318 includes a dual rail step switch 323 that is operable as indicated by the arrows to rotate one or more of two poles, 324a and 324b, so that it is electrically coupled with one of a series of leads.
  • variable resistance assembly applies a variable amount of resistance to dimming interfaces 312a and 312b.
  • switches may be used to apply variable resistance, such as continuous switches, digital switches, and so forth. At least one other example will be described below with respect to Fig. 4.
  • the LED drivers 310 may each have a single output that provides current to strings of LEDs 306 in different ways depending on an amount of resistance applied by variable resistance assembly 318. Accordingly, the resistance (or impedance, as the case may be) applied to leads 314 by variable resistance assembly 318 may cause each LED driver 310 to provide a specific current to its output that drives a respective string 306.
  • each LED driver 310 may be programmable, e.g., using a lookup table stored in its internal memory (not depicted), to map a resistance applied by variable resistance assembly 318 to one or more parameters of output current.
  • Parameters of output current may include an amount of current (e.g., in amps) and/or a pulse width modulation ("PWM") scheme to be applied to the output current.
  • an LED driver 310 may provide a particular amount of steady current to a string of LEDs 306.
  • the LED driver 310 may provide a PWM current to the string of LEDs 306.
  • variable resistance assembly 318 The amount of resistance applied by variable resistance assembly 318 in each of its potential configurations may be calibrated based on desired CCT and lumen output of al l strings of LEDs collectively. As noted above, in some embodiments, a series of discrete CCTs, such as discrete steps between "warm” and “cold” white light, may be targeted at each potential configuration of variable resistance assembly 318. In some embodiments, relatively stable lumen output across CCT settings may be achieved by building, e.g., at the factory, LEDs strings using various selected combinations of LEDs having particular bins, drive currents, and/or fluxes, as wel l as by selecting a particular number of LEDs to be used to build each string 306.
  • Strings of LEDs and variable resistance assemblies in some embodiments may be selected and/or built (e.g., at the factory) as follows.
  • Each string 106 of LEDs may be tuned to particular CCT and intensity.
  • strings may be tuned without using phosphor conversion (e.g., a color mixing chamber of phosphor coating) beyond the LED package. For example, a range of actual CCTs emitted by individual LEDs of a string may be sensed.
  • an amount of current that must be applied to the string of LEDs to achieve a desired (e.g., midpoint) CCT within the range of actual CCTs may be determined.
  • an LED driver may be programmed to output the amount of current needed in response to a particular amount of resistance being applied to a dimming interface of the LED driver. This may be repeated for multiple strings, each having its own individual CCT, to define a series of discrete and/or continuous resistances that will map (e.g., in a lookup table stored in memory of one or more LED drivers) to a series of discrete currents and/or PWM schemes to be applied to each string of LEDs.
  • variable resistance assemblies such as 218 and 318 may be toggled through various discrete or continuous configurations in which they apply various amounts of resistance to LED drivers.
  • a variable resistance assembly may be toggled through its various configurations using user interface element 108.
  • user interface element 108 may be mechanically coupled (directly or indirectly, e.g., using a series of gears or other similar mechanisms) to a switch (e.g., 323) of a variable resistance assembly.
  • Figs.2-3 may be enclosed in a housing of a luminaire, such as within housing 102 of luminaire 100.
  • the control circuitry e.g., a switch
  • a technician is able to change adjust CCT output of a luminaire without opening up a housing, e.g., using simple tools such as screw drivers.
  • variable resistance assembly 418 (which could be used in of 218 and/or in place of 318) that may be operable to vary an amount of resistance applied to dimming leads 414 of LED drivers (not depicted in Fig. 4, see Figs. 2-3).
  • Variable resistance assembly 418 includes a first bank 420a of resistors 422ai_ 6 and a second bank 420b of resistors 422bi_ 6 .
  • Each resistor 422a of the first bank 420a may have a different resistance selected to achieve a desired current to be applied to, for example, dimming interface 312a.
  • each resistor 422b of second bank 420b may have a different resistance selected to achieve a desired current to be applied to, for instance, dimming interface 312b.
  • One or more switches 423 may be electrically coupled with one or more dimming leads 414 of a power supply or LED driver (not depicted in Fig. 4, see Figs. 2-3).
  • Switch 423 may be operable, e.g., by physically actuating user interface element 108, to selectively couple an individual resistor 422 of each resistor bank 420 in Fig. 4 to the respective leads 414.
  • switch 423 takes the form of a so-called "dual pole" switch that is rotatable so that one pole 424a contacts a resistor 422a of first resistor bank 420a and an opposite pole 424b contacts a resistor 422b of second resistor bank 420b.
  • switch 423 may be a continuous or discrete dual pole switch.
  • variable resistance assembly 418 may be instal led, e.g., by connecting the luminaire (e.g., via mount 104) to a power supply, such as mains.
  • a power supply such as mains.
  • switch 423 may be arranged, for instance, as shown in Fig. 4, with first pole 424a contacting a first resistor 422ai of first resistor bank 420a, and with second pole 424b contacting a sixth resistor 422b 6 of second resistor bank 420b.
  • a technician may insert a screwdriver into user interface element 108 and rotate the screw driver to a next potential position.
  • switch 423 may rotate in the direction shown by the arrows in Fig. 4 so that first pole 424a contacts a second resistor 422a 2 of first resistor bank 420a and second pole 424b contacts a fifth resistor 422b 5 of second resistor bank 420b.
  • the technician may rotate the screwdriver to the next potential position, causing switch 423 to rotate once again in the direction shown by the arrows so that first pole 424a contacts a third resistor 422a 3 of first resistor bank 420a and second pole 424b contacts a fourth resistor 422b 4 of second resistor bank 420b.
  • each resistor bank 420 includes six resistors 422 (each applying a different resistance) corresponding to six discrete CCT settings. However, there may be more or less resistors 422 to correspond to more or less discrete CCT settings.
  • a single pole switch may be provided, and actuation of user interface element 108 may correspondingly the single pole switch.
  • a potentiometer may be employed as a variable resistance assembly in addition to or instead of banks of discrete resistors.
  • a potentiometer may be adjustable to provide variable amounts of resistance along a continuous spectrum, rather than the discrete resistances applied by variable resistance assembly 318 in Fig.3 and variable resistance assembly 418 in Fig.4.
  • luminaire 500 includes a multi-output LED driver 510 that is operably coupled to two strings of LEDs, 506a and 506b, rather than the single output LED drivers 310a and 310b.
  • a single rail step switch 523 may be operated in a manner similar to each rail of the dual rail step switch 323 of Fig.3 to selectively electrically couple a pole 524 with one of a series of leads.
  • LED driver 510 may selectively drive first string 506a in a first manner (e.g., with a particular fixed amount of current or a PWM scheme).
  • LED driver 510 may selectively drive second string 506b in a second manner (e.g., with a particular fixed amount of current or a PWM scheme) that may be the same as or different than the manner in which first string 506a is driven.
  • luminaire 500 may be operated as shown in Table 2, below:
  • LED driver 510 applies 550 amps of current to first string 506a through a first port or channel, and applies 50 amps of current to second string 506b through a second port or channel.
  • LED driver 510 applies 450 amps of current to first string 506a and 150 amps of current to second string 506b through a second port or channel.
  • Fig.6 depicts an example method 600 of assembling a luminaire configured with selected aspects of the present disclosure, in accordance with various embodiments. While operations of Fig.6 are depicted in a particular order, this is not meant to be limiting. In various embodiments, various operations may be reordered, added, and/or omitted.
  • a first string of LEDs may be operably coupled with a first output of one or more LED drivers (e.g., 210, 310, 510).
  • the first string of LEDs may be designed to output light having a particular CCT.
  • the individual LEDs of the first string may be associated with a particular LED bin, and may have predetermined flux and/or forward voltage characteristics.
  • a second string of LEDs may be operably coupled with a second output of one or more LED drivers.
  • the second string may be designed to output light having a particular CCT, and may include a selected number of individual LEDs that are associated with a particular LED bin, and/or that may have predetermined flux and/or forward voltage characteristics.
  • the first and second strings may have different numbers of LEDs.
  • the second string may be operably coupled with the same LED driver as the first string (except at a different output), or may be operably coupled with a different LED driver.
  • variable resistance assembly (e.g., 218, 318, 418, 518) may be operably coupled with one or more dimming interfaces (e.g., via leads 314, 414, 514) of the one or more LED drivers. Then, once the LED drivers are powered (e.g., with A/C voltage), the variable resistance assembly may apply different amounts of resistance to the LED drivers, depending on the configuration of the variable resistance assembly (e.g., which resistors of a resistor bank are in contact with a switch).
  • the one or more LED drivers may be programmed or otherwise configured to map predetermined resistances applied by the variable resistance assembly in its various configurations to desired current outputs to be provided to the first and second strings of LEDs. For example, suppose six different combined CCTs are desired from the luminaire.
  • the variable resistance assembly may be transitionable between six different configurations in which six different sets of resistors are electrically coupled with the one or more dimming interfaces of the one or more LED drivers. Consequently, in each of the six configurations, the variable resistance assembly may apply a different resistance, such that the variable resistance assembly can be stepped through a series of six discrete resistances.
  • the one or more LED drivers may be programmed to map each of the six discrete resistances to a first set of six current outputs (e.g., different amounts of current, or modulated using PWM) to be applied to the first string of LEDs, and to a second set of six current outputs to be applied to the second strings of LEDs.
  • a first set of six current outputs e.g., different amounts of current, or modulated using PWM
  • a reference to "A and/or B", when used in conjunction with open-ended language such as “comprising” can refer, in one embodiment, to A only (optionally including elements other than B); in another embodiment, to B only (optionally including elements other than A); in yet another embodiment, to both A and B (optionally including other elements); etc.
  • At least one of A and B can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.

Landscapes

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

Abstract

La présente invention concerne un système tel qu'un luminaire (100, 200, 300, 500) qui, lorsqu'il est configuré avec des aspects choisis de la présente invention, comprend un ou plusieurs circuits d'attaque (210, 310, 510) de diode électroluminescente (« LED ») ayant une ou plusieurs interfaces de gradation (312, 512). Une ou plusieurs chaînes de LED (106, 206, 306, 506) sont connectées de manière fonctionnelle à une ou plusieurs sorties de l'un ou des plusieurs circuits d'attaque de LED. Un élément d'interface utilisateur (108) peut être présent, par exemple de telle sorte qu'il est accessible depuis l'extérieur d'un luminaire. Un ensemble à résistance variable (218, 318, 418, 518) est connecté de manière opérationnelle avec l'une ou les plusieurs interfaces de gradation et peut comprendre une pluralité de configurations potentielles dans lesquelles l'ensemble à résistance variable applique une ou plusieurs résistances prédéterminées respectives à l'une ou aux plusieurs interfaces de gradation. L'élément d'interface utilisateur peut être actionné physiquement entre une pluralité de positions qui correspondent aux configurations potentielles de l'ensemble à résistance variable.
PCT/IB2015/059168 2014-12-09 2015-11-27 Luminaire à couleur réglable avec intensité constante Ceased WO2016092405A1 (fr)

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Citations (4)

* 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
US6211626B1 (en) 1997-08-26 2001-04-03 Color Kinetics, Incorporated Illumination components
JP2005100799A (ja) * 2003-09-25 2005-04-14 Osram-Melco Ltd 可変色発光ダイオードモジュール及び可変色発光ダイオード照明器具
US20140210361A1 (en) * 2013-01-28 2014-07-31 Lumenetix, Inc. Linear bypass electrical circuit for driving led strings

Patent Citations (4)

* 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
US6211626B1 (en) 1997-08-26 2001-04-03 Color Kinetics, Incorporated Illumination components
JP2005100799A (ja) * 2003-09-25 2005-04-14 Osram-Melco Ltd 可変色発光ダイオードモジュール及び可変色発光ダイオード照明器具
US20140210361A1 (en) * 2013-01-28 2014-07-31 Lumenetix, Inc. Linear bypass electrical circuit for driving led strings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"United States Patent Office Manual of Patent Examining Procedures"

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