CN103947291A

CN103947291A - Temperature curve compensation offset

Info

Publication number: CN103947291A
Application number: CN201280059080.7A
Authority: CN
Inventors: E.布拉福德
Original assignee: Cree Inc
Current assignee: Wolfspeed Inc
Priority date: 2011-10-02
Filing date: 2012-10-01
Publication date: 2014-07-23
Also published as: WO2013052403A1

Abstract

A lighting device includes a first array of LEDs, a temperature sensor, memory, and a system controller. The memory may include a first duty cycle offset and first curve information that defines a relationship between temperature and a duty cycle for driving at least one LED of the first array of LEDs. The system controller will determine a temperature based on information from the temperature sensor. Based on the temperature, the system controller will determine a first pre-calibrated duty cycle that corresponds to the temperature from the first curve information and then adjust the first pre-calibrated duty cycle with the first duty cycle offset to generate a first calibrated duty cycle. The LED is then driven with a first pulse width modulated signal having the first calibrated duty cycle.

Description

Temperature curve compensating offset

the cross reference of related application

The application requires the rights and interests of the U.S. Provisional Patent Application number 61/542,276 of submitting on October 2nd, 2011, and its whole disclosures are incorporated herein by reference.The application and following U.S. Provisional Application number about: submit on October 2nd, 2011 61/542,274; 61/581,781 of submission on December 30th, 2011; And on January 13rd, 2012 submit to 61/586,462, its whole disclosures are incorporated herein by reference.The Application No. that the application also submits to when as follows about: title is 13/565,113 of OVER-TEMPERATURE HANDLING OF LIGHTING DEVICE; Title is 13/565,220 of OVER-VOLTAGE HANDLING FOR A LIGHTING DEVICE; And title is 13/565,272 of OVERCURRENT HANDLING FOR A LIGHTING DEVICE, its whole disclosures are merged by reference.

Technical field

The disclosure relates to the Sony ericsson mobile comm ab of processing safely excess temperature situation.

Background technology

Sony ericsson mobile comm ab adopts light-emitting diode (LED) array as light source conventionally.LED uses the signal of direct current (DC) or arteries and veins width modulated (PWM) to drive conventionally.Like this, LED array must be associated with controlling electronic installation, at least to generate DC or pulse-width signal.Although Sony ericsson mobile comm ab is more much higher than the efficiency of incandescent lamp bulb, if suitably do not manage heat, LED still may generate with associated control electronic installation the heat that is enough to damage LED or controls electronic installation during operation.Too much heat also may cause on fire and other dangerous situations.Like this, radiator is generally used for guiding heat to leave from LED and correlation electron device, and therefore, keeps LED and correlation electron device in the operating temperature of expecting.

Summary of the invention

The disclosure relates to a kind of luminescent device, and luminescent device comprises the first LED array, temperature sensor, memory and system controller.Memory can comprise: the first duty-cycle offset and the first calibration curve information, the first calibration curve information definition temperature and for driving the relation between the duty ratio of at least one LED of the first LED array.The information based on from temperature sensor is determined temperature by system controller.Based on this temperature, system controller will be determined the first pre-calibration duty ratio corresponding with temperature according to the first calibration curve information, and then adjusts the first pre-calibration duty ratio with the first duty-cycle offset, to generate the first calibration duty ratio.Then, carry out driving LED with first pulse-width signal with the first calibration duty ratio.

This calibration curve information is illustrated in temperature and for the pre-calibration relation between the duty ratio of the pulse-width signal of driving LED.Although pre-calibration duty ratio may not cause intensity or the colour temperature utilizing emitted light of luminescent device to expect, it is and the skew of pre-calibration duty ratio that pre-calibration duty ratio is to make luminescent device necessary with intensity and the colour temperature utilizing emitted light expected that but the first duty-cycle offset is confirmed as.

Due to have different configurations LED array can with luminescent device in system controller pairing, so memory can be configured with the unique calibration curve information for different array configurations.Like this, for the specific curves information of the LED array of system controller pairing can be by system controller choice and operation.

After the detailed description of those skilled in the art below having read by reference to the accompanying drawings, will recognize the scope of the present disclosure and recognize additional aspect of the present disclosure.

Brief description of the drawings

The accompanying drawing of integrating with this specification and forming the part of this specification illustrates some aspects of the present disclosure, and together with the description for explaining principle of the present disclosure.

Fig. 1 be the exemplary luminescent device of an embodiment that can how to realize according to the disclosure and the front side of power supply etc. axle survey view.

Fig. 2 is that the axle that waits of the rear side of the luminescent device of Fig. 1 is surveyed view.

Fig. 3 A is the viewgraph of cross-section of the power supply of Fig. 1.

Fig. 3 B is that the axles such as the decomposition of the luminescent device of Fig. 1 are surveyed view.

Fig. 4 be do not have the luminescent device of Fig. 1 of lens, diffuser and reflector front side etc. axle survey view.

Fig. 5 be do not have the luminescent device of Fig. 1 of lens and diffuser front side etc. axle survey view.

Fig. 6 is the viewgraph of cross-section of the luminescent device of Fig. 5.

Fig. 7 is the viewgraph of cross-section of the LED framework of the first kind.

Fig. 8 is the viewgraph of cross-section of the LED framework of Second Type.

Fig. 9 is according to the schematic diagram of the exemplary control module electronic installation of first embodiment of the present disclosure.

Figure 10 is according to the schematic diagram of the exemplary control module electronic installation of second embodiment of the present disclosure.

Figure 11 is according to the schematic diagram of the exemplary control module electronic installation of third embodiment of the present disclosure.

Figure 12 is according to the schematic diagram of the exemplary control module electronic installation of fourth embodiment of the present disclosure.

Figure 13 is the line chart to temperature for the duty ratio of pulse-width signal that drives red-light LED of the LED array different for four.

Embodiment

The embodiment setting forth below represents to enable those skilled in the art to put into practice necessary information of the present disclosure, and has illustrated and put into practice optimization model of the present disclosure.After reading the description below with reference to the accompanying drawings, it should be appreciated by those skilled in the art that principle of the present disclosure, and will recognize the application that does not specifically propose these principles here.Should be understood that, these principles and application drop in the scope of the present disclosure.

Will be appreciated that, such as " front side ", " forward ", " rear ", " below ", " top ", " on ", the relational terms of D score, " level " or " vertically " here can be for describing the relation in element, layer or a region and another element, layer or region, as shown in the drawing.Will be appreciated that these terms are intended to comprise the difference orientation of the device the orientation of describing in accompanying drawing.

The disclosure relates to the Sony ericsson mobile comm ab of the ability with the improvement of processing excess temperature situation.Understand with being convenient to for context, before how description Sony ericsson mobile comm ab can be configured to process excess temperature situation, first description has below described exemplary luminescent device.With reference to figure 1 and Fig. 2, illustrate according to unique luminescent device 10 of an embodiment of the present disclosure and power supply 12.Although this specific luminescent device 10 is used to reference, person of skill in the art will appreciate that, the Sony ericsson mobile comm ab of in fact any type can be benefited from the disclosure.

As shown, luminescent device 10 comprises mounting structure 14 and lens 16.Illustrated mounting structure 14 is cup-shaped, and can be used as radiating element; But different fixtures can comprise different mounting structure 14, this mounting structure 14 can maybe can be not used as radiating element.The light source (not shown) will be discussed in further detail below is installed in mounting structure 14 inside, and is directed to make light to launch from mounting structure scioptics 16.Further describe the needed electronic installation (not shown) of driving light source below.Power supply 12 is coupled to interchange (AC) source conventionally, and for providing electric power to the electronic installation of luminescent device 10.Although in the concealed luminous application of 4,5 and 6 inches that anticipation luminescent device 10 is mainly used in applying for industry, business and house, those skilled in the art will recognize that, in fact principle disclosed herein is applicable to any size and application.

Lens 16 can comprise one or more lens, and these lens are by making such as the clear or transparent material of Merlon or acrylic glass or any other suitable material.As discussed further below, lens 16 can be associated with diffuser, the light diffusion of this diffuser for making to send from light source, and leave mounting structure 14 via lens 16.In addition the mode that, lens 16 can also be configured to expect is carried out shaping and guiding to the light that leaves mounting structure 14 via lens 16.

Power supply 12 and luminescent device 10 can be modular, and wherein the power supply 12 of different size, shape and type can use suitable wire harness to be connected or otherwise be coupled to the mounting structure 14 of luminescent device 10.Separate although be shown as physically, power supply 12 and luminescent device 10 can be integrated to form single structure.

In illustrated embodiment, mounting structure 14 is cup-shaped and comprises sidewall 18, and sidewall 18 extends between the base plate 20 at the rear of mounting structure 14 and wheel rim, and wheel rim can be provided by the annular flange flange of the front side of mounting structure 14 22.Can in the outer surface of sidewall 18, form one or more elongated slots 24.Have two elongated slots 24, the central shaft that elongated slot 24 is parallel to luminescent device 10 extends towards (but not exclusively arriving) annular flange flange 22 from the rear surface of base plate 20.Elongated slot 24 can be for various objects, such as providing passage for the earth lead that is connected internally to mounting structure 14 at elongated slot 24, add ons is connected to luminescent device 10, or as described further below, lens 16 is firmly adhered to mounting structure 14.

Annular flange flange 22 can comprise that installing hole is provided at one or more recess 26 is installed.Installing hole can be for luminescent device 10 is installed to mounting structure, or for annex being installed to luminescent device 10.Recess 26 is installed to be provided for anti-the head of bolt, screw or other attachment devices front surface that sinks to annular flange flange 22 below or wherein.

With reference to figure 3A, provide the viewgraph of cross-section of the power supply 12 of Fig. 1.As shown, power supply 12 comprises power supply electronic device 28, and this power supply electronic device 28 is sealed by power shell 30 and power supply lid 32.Power shell 30 is cup-shaped and has the size that is enough to receive power supply electronic device 28.Power supply lid 32 provides the lid extending above the opening of power shell 30 substantially.Once power supply lid 32 is in place, power supply electronic device 28 is just comprised in power shell 30 and power supply lid 32.

Power supply electronic device 28 can be for electric power being provided and specific control signal may being provided, and this electric power and specific control signal are necessary to the light source module power supply of luminescent device 10 and the light source module of control luminescent device 10.With reference to figure 3B, in the decomposition view of luminescent device 10, illustrate the rear side of light source module 34.As shown, light source module 34 can be installed on the front surface of base plate 20 of mounting structure 14, or (not shown) in the gap providing in base plate 20 is provided.In the base plate 20 of mounting structure 14 and power supply lid 32, provide hole or the opening of aligning, to promote the electrical connection between power supply electronic device 28 and the light source module 34 of luminescent device 10 in power supply 12.

In illustrated embodiment, light source module 34 adopts the light-emitting diode (LED) and associated control electronic installation that are conventionally installed to printed circuit board (PCB) (PCB).Except other functions, control electronic installation is configured to driving LED and generates light with color, intensity and the colour temperature expected.The detailed operation of light source module 34 is below further provided.Control electronic installation and LED and be shown as on the front side that is arranged on PCB, and the rear side of PCB directly or be installed to the front surface of the base plate 20 of mounting structure 14 via heat conductive pad (not shown).In this embodiment, heat conductive pad has low thermal resistivity, and therefore, the heat being generated is delivered to effectively to the base plate 20 of assembling structure 14 by light source module 34.

Although various installing mechanisms are available, illustrated embodiment adopts four bolts 44 PCB of light source module 34 to be attached to the front surface of the base plate 20 of assembling structure 14.Bolt 44 is screwed in the screwed hole providing in the front surface of base plate 20 of mounting structure 14.Significantly, the shape of PCB is illustrated as square, but this shape can be rectangle, circle, ellipse, polygon etc.

The internal chamber being provided by mounting structure 14 is provided reflector cone 36.In illustrated embodiment, reflector cone 36 has conical wall, and this conical wall is extended between larger open front and less after-opening.Larger open front is arranged in the open front of mounting structure 14 and corresponds essentially to the yardstick of the open front of mounting structure 14, and the open front of this mounting structure 14 is corresponding with the front side of the internal chamber being provided by mounting structure 14.The less after-opening of reflector cone 36 is positioned near the LED or LED array being provided by light source module 34, and corresponds essentially to the size of this LED or LED array.The front surface common (but not necessarily) of reflector cone 36 is highly reflectives, for improving overall efficiency and the optical property of luminescent device 10.In a particular embodiment, reflector cone 36 is combined to form by metal, paper, polymer or its.In itself, reflector cone 36 is for the light of launching from light source module 34 provides mixing chamber, and how scioptics 16 leave mixing chamber can or to control light for help guiding.

In when assembling, lens 16 are installed in above annular flange flange 22, and can be for reflector cone 36 being remained on to the original position in the internal chamber of mounting structure 14, and supplementary lens and one or more plane diffuser 38 are remained on to original position.In illustrated embodiment, lens 16 and diffuser 38 conventionally in shape and size corresponding to the open front of mounting structure 14, and be installed to be make the front surface of lens 16 and the front surface of annular flange flange 22 substantially flush.As shown in Figures 4 and 5, recess 48 is provided on the inner surface of sidewall 18, and substantially around the opening of mounting structure 14.Recess 48 provides protuberance, and diffuser 38 and lens 16 are at inner this protuberance that relies on of mounting structure 14, and this recess 48 can enough flush with the front surface of annular flange flange 22 with the front surface that makes lens 16 deeply.

Turn back to Fig. 3 B, lens 16 can comprise fin 40, and this fin 40 extends back from the outward flange of lens 16.Fin 40 can slide in the corresponding passage on the inner surface of sidewall 18 (referring to Fig. 4).Passage is aimed at the corresponding elongated slot 24 on sidewall 18 outsides.Fin 40 has screwed hole, and this screwed hole is aimed at the hole providing in groove and elongated slot 24.In the time that lens 16 are arranged in the recess 48 of open front place of mounting structure 14, the hole in fin 40 will be aimed at the hole in elongated slot 24.Bolt 42 can be inserted into by the hole in elongated slot, and is screwed in the hole providing in fin 40 so that lens 16 are attached to mounting structure 14.In the time that lens 16 are fixed, diffuser 38 is sandwiched between lens and recess 48, and reflector cone 36 is comprised between diffuser 38 and light source module 34.Alternatively, retaining ring (not shown) can be attached to the flange 22 of mounting structure 14, and is operating as a lens 16 and diffuser 38 remains on original position.

The degree of the diffusion being provided by diffuser 38 and type can change to another from an embodiment.In addition, the color of diffuser 38, translucence or opacity can change to another from an embodiment.Diffuser 38 such as illustrated separation in Fig. 3 B is formed by polymer, glass or thermoplastics conventionally, but other materials is feasible and will be by those skilled in the art will recognize that.Similarly, lens 16 be plane and conventionally corresponding to the shape and size of the open front of diffuser 38 and mounting structure 14.As the same with diffuser 38, material, color, translucence or the opacity of lens 16 can change to another from an embodiment.In addition, diffuser 38 and lens 16 the two can form or be formed by one or more layers of identical or different material by one or more materials.Although only described a diffuser 38 and lens 16, luminescent device 10 can have multiple diffusers 38 or lens 16.

For LED-based application, light source module 34 provides LED array 50, as illustrated in Figure 4.Fig. 4 illustrates the front axle that waits of luminescent device 10 and surveys view, has wherein removed lens 16, diffuser 38, reflector cone 36, makes light source module 34 and LED array 50 interior high-visible at mounting structure 14.Fig. 5 illustrates the front axle that waits of luminescent device 10 and surveys view, has wherein removed lens 16 and diffuser 38 and reflector cone 36 in position, and the LED array 50 of light source module 34 is aimed at the after-opening of reflector cone 36 like this.As mentioned above, reflector cone 36 is inner and provide mixing chamber taking the after-opening of reflector cone 36 and lens 16 or diffuser 38 as the volume of boundary.

The light of launching from LED array 50 is mixed by the reflector cone 36 mixing chamber inside that form, and scioptics 16 outwards guide to form light beam in forward direction.The LED array 50 of light source module 34 can comprise the LED 50 of the light of launching different colours.For example, LED array 50 can comprise green partially blue (BSG) LED that launches the red-light LED of red light and Huang Pianlan (BSY) LED of the blue gold-tinted of transmitting or transmitting blue green light, and wherein, red and blue Huang or blue green light are mixed to form " in vain " light of expecting colour temperature.In a particular embodiment, LED array can comprise a large amount of red-light LEDs and BSY or BSG LED with various ratios.For example, two or three BSY or BSG LED can be associated with each red-light LED, and the sum of LED to depend on application can be 10,25,50,100 or more.Fig. 4,5 and 6 for clear only at 9 LED shown in LED array.

For the light beam of even color, expect the relatively complete mixing to the light of launching from LED array 50.The light that reflector cone 36 and the diffusion being provided by diffuser 38 are sent from the LED array 50 of light source module 35 in mixing, play a significant role.Particularly, be called the not particular light ray of reverberation ray and send from LED array 50, and in the case of the internal surface reflection of reflector vertebra 36, do not leaving mixing chamber by diffuser 38 and lens 16.Other light that are called reflection ray send from the LED array 50 of light source module 34, and are bored 36 front surface reflection one or many by reflector before leaving chamber by diffuser 38 and lens 16.Adopt these reflection, make reflection light before leaving mixing chamber by diffuser 38 and lens 16 in mixing chamber with each other and with at least some not reflection ray effectively mix.

As mentioned above, diffuser 38 is for when not reflecting while leaving mixing chamber with reflection ray diffusion and therefore mixing them, wherein mixing chamber and diffuser 38 provide the expectation of the light that the LED array 50 from light source module 34 is sent to mix, so that a light beam of making peace desired color to be provided.Except mixing light, can also design lens 16 and diffuser 38 and shaping reflector vertebra 36 by controlling the relative market concentration of result light beam and the mode of shape that project from luminescent device 10.For example, the first luminescent device 10 can be designed as the convection light that is provided for spotlight, and wherein, another can be designed as the widely-dispersed light beam that is provided for floodlight.According to Angel of Aesthetic, the scattering being provided by diffuser 38 also prevents that the light of transmitting from seeming pixel, and obstruction user sees the ability of the individual LED of LED array 50.

As provided in the above-described embodiments, be to provide the diffuser 38 separating with lens 16 for more traditional method of diffusion.Like this, lens 16 are in fact transparent, and can not add any diffusion of having a mind to.The diffusion of having a mind to is provided by diffuser 38.In most of examples, diffuser 38 and lens 16 are placed adjacent one another, as shown in Figure 6.But in other embodiments, diffusion can be integrated in lens 16 itself.

In Fig. 7, illustrate the conventional package for the LED 52 of LED array 50.Single led chip 54 uses scolder or conductive epoxy resin to be installed on reflector 56, makes the ohmic contact of the negative electrode (or anode) of LED chip 54 be electrically coupled to the bottom of reflector 56.Reflector 56 is coupled to the first lead-in wire 58 of LED 52 or forms with the first lead-in wire 58 entirety of LED 52.The ohmic contact of the anode of LED chip 54 (or negative electrode) is connected to the second lead-in wire 62 by one or more wire bonds 60.

Reflector 56 can be filled with the sealant material 64 of sealing LED chip 54.Sealant material 64 can be transparent, or comprises the material for transformation of wave length such as fluorophor, and this will be described in greater detail below.Whole assembly is sealed in transparency protected resin 66, and its shape that can be molded into lens is to control the light of launching from LED chip 54.

In Fig. 8, illustrate the alternative package for LED 52, wherein LED chip 54 is installed in substrate 67.Particularly, the ohmic contact of the anode of LED chip 54 (or negative electrode) is directly mounted to lip-deep first contact pad 68 of substrate 67.The ohmic contact of the negative electrode (or anode) of LED chip 54 is used wire bonds 72 to be connected to also lip-deep the second contact pad 70 in substrate 67.LED chip 54 is arranged in the cavity of reflector structure 74, this cavity formed by reflecting material and that launch from LED chip 54 for reflecting, by the light of the opening that formed by reflector structure 74.The cavity being formed by reflector structure 74 can be filled with the sealant material 64 of sealing LED chip 54.Sealant material 64 can be transparent, or comprises the material for transformation of wave length such as fluorophor.

In any one of Fig. 7 and 8 embodiment, if sealant material 64 is transparent, the light of being launched by LED chip 54 without any substantive colour cast in the situation that by sealant material 64 and protection resin 66.Like this, the light of launching from LED chip 54 is actually the light of launching from LED 52.If sealant material 64 comprises material for transformation of wave length, all or part of of the light in first wave-length coverage of substantially being launched by LED chip 54 can be absorbed by material for transformation of wave length, and material for transformation of wave length is by the light of responsively launching in second wave length scope.Regulation is had the degree that the light of how much being launched by LED chip 54 is absorbed by material for transformation of wave length and wavelength is changed by the concentration degree of material for transformation of wave length and type.Pass through in non-absorbent situation at some light of being launched by LED chip 54, in the embodiment of material for transformation of wave length, will to mix with the light of being launched by material for transformation of wave length by the light of material for transformation of wave length.Therefore,, in the time using material for transformation of wave length, the light of being launched by LED 52 is offset in color from the actual light of being launched by LED chip 54.

As mentioned above, LED array 50 can comprise 52 groups of BSY or 52 groups of BSG LED and red-light LEDs.BSY LED52 comprises the LED chip 54 of launching blue light, and material for transformation of wave length is the yellow fluorophor that absorbs blue light and transmitting sodium yellow.Even if some blue lights are by fluorophor, the synthetic mixing of the light of launching from overall BSY LED 52 is also sodium yellow.The sodium yellow of launching from BSY LED 52 has the color dot of black body locus (BBL) top of conventionally dropping on 1931 XYZ chromaticity diagram, and wherein BBL is corresponding to the various colour temperatures of white light.

Similarly, BSG LED 52 comprises the LED chip 54 of launching blue light; But material for transformation of wave length is absorb blue light and launch the green-emitting phosphor of green light.Even if some blue lights are by fluorophor, the synthetic mixing of the light of launching from overall BSG LED 52 is also green light.The green light of launching from BSG LED 52 has the color dot of the BBL top of also dropping on 1931 XYZ chromaticity diagram conventionally, and wherein BBL is corresponding to the various colour temperatures of white light.

Red-light LED 52 is transmitted in the red light at the color dot place on the opposite side (or following) of BBL conventionally as yellow or the green light of BSY or BSG LED 52.Like this, mix with yellow or the green light of launching from BSY or BSG LED 52 from the red light 52 of red-light LED, to generate white light, this white light has the colour temperature of expectation and drops near the BBL of expectation.In fact, from the red light of red-light LED 52, the yellow from BSY or BSG LED 52 or green light are moved to BBL upper or approach the expectation color dot of BBL.Significantly, red-light LED 52 can have the LED chip 54 of natural transmitting red light, does not wherein adopt material for transformation of wave length.Alternatively, LED chip 54 can be associated with material for transformation of wave length, and wherein, the synthetic light of launching from material for transformation of wave length and any light of launching from LED chip 54 not absorbed by material for transformation of wave length mix to form the red light of expectation.

The blue-light LED chip 54 that is used to form BSY or BSG LED 52 can be formed by material systems such as gallium nitride (GaN), InGaN (InGaN), carborundum (SiC), zinc selenides (zinc selenide).Red LED chip 54 can be formed by material systems such as aluminum indium nitride gallium (AlInGaP), gallium phosphide (GAP), aluminum gallium arsenide (AlGaAs).Exemplary yellow fluorophor comprises cerium doped yttrium aluminum garnet (YAG:Ce), yellow BOSE(Ba, O, Sr, Si, Eu) fluorophor etc.Exemplary green luminophore comprises the LuAg(LuAg:Ce of green BOSE fluorophor, Luetcium aluminum garnet (LuAG), cerium doping), from the Maui M535 of the Lightscape Materials company on NJ 08540 Washington road, Princeton 201 etc.The system of above LED framework, fluorophor and material is only exemplary, and is not intended to provide the exclusive list of the framework, fluorophor and the material system that are applicable to principle disclosed herein.

As noted, the LED array 50 on light source module 34 can comprise the mixing of red-light LED 52 and BSY or BSG LED 52.As illustrated in Figure 9, light source module 34 can also comprise various control electronic installations, such as direct current (DC) power supply 82 of system controller 76, communication port 78, temperature sensor 80 and adjusting.In the present embodiment, plate external power 12 may receive variable voltage AC signal from the triac having the optical switch (not shown) of brightness adjustment control, and provides DC drive current to the port P1 of light source module 34.Dimming level based on from AC signal (this AC signal receives from triac) sensing and drive current is provided, the level at drive current place is enough at a strength level driving LED array 50, and this strength level is conventionally suitable with the output of the expectation lumen of LED array 50.Like this, drive current can be variable, and conventionally corresponding to the dimming level arranging at optical switch place.One or more capacitor C1 are can be as shown inner or be externally provided at the output of power supply 12, for the stable voltage that this drive current is offered to LED array 50.

The drive current being provided by power supply 12 can also be used for powering to system controller 76.In this embodiment, the voltage providing at port P1 place is adjusted to relatively-stationary voltage downwards so that system controller 76 is powered by the DC power supply 82 regulating.In operation, the drive current providing at port P1 place is fixed on conventionally for the maximum of maximum intensity level with for the corresponding smaller value of any given dimming level.

Significantly, LED array 50 comprises the LED D1-D7 string being connected in series, and wherein this string is coupling in port P1 and is coupled between the switch S 1 on ground.In illustrated embodiment, the LED D1-D7 string being connected in series for drive current is flow through, the necessary Closing Switch S1 of system controller 76, this switch S 1 can be transistor, such as bipolar junction transistor (BJT) or field-effect transistor (FET).In one embodiment, switch S 1 is N channel fet, and wherein drain electrode is coupled to the LED D1-D7 string being connected in series, and source electrode is coupled to ground, and grid is coupled to the control output of system controller 76 and is coupled to the pull-down-resistor R1 on ground.Like this because resistor R1 the grid of N channel fet will be moved to ground, so in the time that system controller 76 is not applied to the grid of N channel fet positive voltage, (or opening) that N channel fet (switch S 1) normally ends.

In order to guide drive current by the LED D1-D7 string being connected in series, system controller 76 will be applied to positive voltage the grid of N channel fet.In the time that positive voltage is applied to grid, N channel fet is conducting, and the LED D1-D7 string being connected in series is coupled to ground effectively, makes drive current can flow through the LED D1-D7 of series coupled.Flowing the LED D1-D7 that makes to be connected in series with the proportional intensity utilizing emitted light of value common and drive current of drive current.

As mentioned above, LED array 50 and the string of the LED D1-D7 being connected in series therefore can be different types.In Fig. 9, only illustrate 7 LED D1-D7, but can adopt the LED of any number.As shown, LED D1, D2, D5 and D6 are BSY type and transmitting sodium yellow, and LED D3, D4 and D7 are ruddiness type (R) and transmitting red light.As described in, thereby form " in vain " light from redness and the sodium yellow of each LED D1-D7 transmitting from sending the colour temperature mixing to expect.

Switch S 2 and S3 be provided for colour temperature, intensity or the colour temperature of combined light of the string transmitting of effectively adjusting the D1-D7 of the LED from being connected in series and intensity the two.As described below, system controller 76 can be controlled effectively by switch S 2 amount of the red light of being launched by LED array 50, and can effectively control by switch S 3 amount of the sodium yellow of being launched by LED array 50.

Switch S 2 is coupling in ruddiness type LED D7 two ends, and is controlled by system controller 76.Switch S 3 is coupling in BSY type LED D5 two ends, and is also controlled by system controller 76.Closing Switch S2 and S3 provide respectively the electric short circuit at corresponding LED D7 and D5 two ends effectively, and therefore, reboot around the drive current of LED D7 and D5 and pass through switch S 2 and S3.

In the time that switch S 1 closure and switch S 2 and S3 open, drive current flows through the LED D1-D7 string being connected in series, and comprises LED D7 and D5.If the closed Simultaneous Switching S1 of switch S 2 remains closed and switch S 3 stays open, drive current is walked around LED D7, but still flows through LED D1-D6.If the closed Simultaneous Switching S1 of switch S 3 remains closed and switch S 2 stays open, drive current is walked around LED D5, but still flows through LED D1-D4 and D6-D7.Closing Switch S2 closes ruddiness type LED D7 effectively, and reduces the amount by the red light that is connected in series transmitting of LED D1-D7.Closing Switch S3 closes BSY type LED D5 effectively, and reduces the amount by the red light that is connected in series transmitting of LED D1-D7.

In operation, system controller 76 can utilize individual pulse-width modulation (PWM) signal to come driving switch S2 and S3, each in this pulse-width signal is a series of pulses, and these a series of pulses are quick-make and shutoff ruddiness type LED D7 and BSY type LED D5 in the time that drive current is provided for the LED D1-D7 string being connected in series.For period demand ruddiness type LED D7 and BSY type LED D5 conducting and cut-off how long, the corresponding Duty ratio control of pwm signal.Like this, the Duty ratio control of the pwm signal of driving switch S2 is from the mean intensity of the red light of ruddiness type LED D7 transmitting, and like this, control is added to from the amount of the red light of the ruddiness type LED D7 of the overall light of other LED D1-D6 transmittings.Similarly, the Duty ratio control of the pwm signal of driving switch S3 is from the mean intensity of the sodium yellow of BSY type LED D5 transmitting, and like this, control is added to from the amount of the sodium yellow of the BSY type LED D5 of the overall light of other LED D1-D4 and D6-D7 transmitting.Keep relative when constant when the red light intensity from LED D3 and D4 transmitting and from the yellow light intensity of LED D1, D2 and D6 transmitting for given drive current, system controller 76 can control switch S2 and S3 effectively change separately from the red light of LED D7 transmitting with from the yellow light intensity of LED D5 transmitting, and change as a whole thus from colour temperature and the bulk strength of the light of LED D1-D7 transmitting.

This switch S 1 and S2 can be transistors, for example BJT or FET.In one embodiment, switch S 2 is N channel fets, and wherein drain coupled is to the anode of LED D7, and source-coupled is to the negative electrode of LED D7, and grid is coupled to the control output of system controller 76.Switch S 3 is P channel fets, and wherein drain coupled is to the anode of LED D5, and source-coupled is to the negative electrode of LED D5, and grid is coupled to the control output of system controller 76.

In the time supplying electric power by power supply 12, system controller 76 can be switched on, and makes switch S 1 closure.In the time that switch S 1 is closed, if system controller 76 is configured to energising in the time that switch S 2 and S3 open, the drive current being provided by power supply 12 is delivered by LED D1-D7.If system controller is configured to the energising closed time of one or both in switch S 2 and S3, drive current is by corresponding one or two of walking around in LED D7 and D5.After energising, system controller 76 sends to switch S 2 and S3 by starting by corresponding pwm signal, to control from corresponding LED D7 and the redness of D5 transmitting and the amount of sodium yellow, and therefore, bulk strength, the colour temperature etc. of the overall light of launching from luminescent device 10 is set.

During operation, system controller 76 is by near temperature light source module 34 places that monitor as provided by temperature sensor 80 or light source module 34, for detection of the excess temperature situation of LED array 50.Temperature sensor 80 can separate with system controller 76 or be integrated, and can comprise resistive, inductive, capacitive character or the semiconductor element along with variations in temperature.Excess temperature situation can be corresponding to: the temperature that the temperature monitoring exceedes max-thresholds, monitor exceedes nominal threshold value and reaches section preset time etc.For example, any time that excess temperature situation can exceed 160 degrees Fahrenheits in monitored temperature is triggered, or exceedes when 140 degrees Fahrenheits reach more than ten (10) minutes and be triggered in monitored temperature.Other and more complicated scheme are possible and are taken into account in the scope of the present disclosure.For example, the temperature monitoring can be integrated in time and with given threshold.

If system controller 76 detects excess temperature situation, call shutdown process.Shutdown process requires to open switch S 1 and flows through LED D1-D7 to stop drive current.Because LED D1-D7 is the main source of heat generation while being applied in drive current, flow through the LED D1-D7 heat that significantly minimizing is generated by light source module 34 so stop drive current.

Because power supply 12 may not recognized excess temperature situation and the drive current on light source module 34 and no longer be supplied to LED D1-D7, power supply 12 is attempted light source module 34 to supply electric power by continuing.Because the drive current of LED D1-D7 is no longer by LED D1-D7, the voltage that the output of power supply (node P1) is located significantly rises in the situation that load reduces.Therefore,, even disappear in excess temperature situation, the high voltage being provided by the output of power supply 12 at port P1 place may exceed the safe voltage that is applied to the LED D1-D7 string being connected in series.By the support that is stored in the electric charge in capacitor C1, by closed S1, the LED D1-D7 string being connected in series is applied to excessive voltage and can cause super-high-current surge to be delivered to LED D1-D7.Excessive electric current may damage LED D1-D7 to reach following degree: cause losing efficacy immediately or will causing the inefficacy of LED D1-D7 after the excess temperature situation repeating in experience of LED D1-D7.

For fear of damage LED by Closing Switch S1 simply in the time that supply voltage is too high, the disclosure has proposed different protection schemes.The first protection scheme relates to makes system controller 76 enter state that disable switch S1 is closed until system reset occurs.System reset removes by relating to the electric power that power supply 12 is supplied conventionally, such as in the time that optical switch is closed.In the time no longer supplying electric power to power supply 12, power supply itself is by the supply electric power stopping port P1.But any output capacitance of capacitor C1 and power supply 12 will have the electric charge of the storage in excessive voltage levvl.This electric charge will be consumed by the electronic installation of light source module 34, and particularly, is consumed by system controller 76.In the time that electric charge is consumed, the voltage that is fed to DC power supply 82 will reduce, until the minimum operation voltage of system controller 76 no longer can offer system controller 76 by DC power supply 82.At this moment, system controller 76 is by out of service.The electronic installation of system controller 76 will be guaranteed switch S 1 remain off, until system controller 76 no longer can move due to the operating voltage declining.

In the time again supplying electric power to power supply 12, power supply 12 will be again to light source module 34 electric power is provided, in the time applying electric power, system controller 76 will be switched under the state in switch S 1 closure.In the time that switch S 1 is closed, drive current flows through the LED D1-D7 string being connected in series before the voltage on port P1 is reached to excessive level.In brief, in the time applying electric power, present initial load to power supply 12, and by presenting initial load, prevent that excessive load is fed to LED array 50 by power supply 12.

In the time of energising, system controller 76 will check to check the excess temperature situation that whether exists.If excess temperature situation exists, system controller 76 will be opened switch S 1 again effectively to close LED array 50, and again, system controller 76 is opened maintained switch S1 until system reset occurs.In fact, system controller 76 force users are cut off the electric power to luminescent device 10, and make its remain off reach the time of q.s, be depleted at least lsafety level with the capacitive charge that handle is stored in power supply 12 before permission drive current is presented to LED array 50.In addition, system controller 76 guarantees that LED array 50 does not excessively live through tender feeling condition.

In the second protection scheme; system controller 76 is also configured to monitor the voltage at port P1 place; and the in the situation that of port P1 place over-voltage condition, take action and open switch S 1, if or have over-voltage condition at port P1 place, prevent the closure of switch S 1.With reference to Figure 10, light source module 34 is configured with the bleeder circuit being formed by resistor R2 and R3.Resistor R2 and R3 are connected in series between port P1 and ground.The node of contact resistance device R2 and R3 provides voltage divider output, and is coupled to system controller 76.Voltage divider output is in direct ratio with the voltage at port P1 place, and like this, system controller 76 can monitor voltage divider output, and reality or the relative voltage at definite port P1 place.If the voltage of voltage divider output exceedes the threshold value of definition, over-voltage condition is detected by system controller 76, and this will open switch S 1 in the time that switch S 1 is closed, or in the time that over-voltage condition exists, prevent switch S 1 closure.

In the present embodiment, light source module 34 is illustrated as and has the resistor R4 and the switch S 4 that between port P1 and ground, are connected in series.If cause over-voltage condition to exist because switch S 1 opens, and offer the drive current of LED D1-D7 and cause the voltage at port P1 place to float to excessive level because do not exist, system controller 76 can Closing Switch S4 so that resistor R4 is presented to power supply 12 as load.Resistor R4 can have the resistance of the resistive load that is similar to the LED D1-D7 string being connected in series, and therefore draws and be similar to the drive current being drawn from power supply 12 by LED D1-D7.Guiding drive current is reduced to lsafety level by resistor R4 by the voltage that effectively makes port P1 place.Once the voltage at port P1 place reaches lsafety level, system controller 76 just can Closing Switch S1, and opens immediately switch S 4 so that drive current is rebooted to LED D1-D7 from resistor R4.

Although Fig. 9 and Figure 10 only illustrate a LED D1-D7 string being connected in series, can adopt the string of any number.Figure 11 illustrates the embodiment with at least two strings.The first string comprises the LED D1-D7 being connected in series, and the second string comprises LED the D1 '-D7 ' being connected in series.In the present embodiment, drive current is optionally delivered to two strings by Closing Switch S1 simultaneously.In addition, switch S 2 is coupling in the D7 ' two ends in LED D7 and the second string in the first string, makes system controller 76 can control the amount by the red light of LED D7 and D7 ' transmitting.Switch S 3 is coupling in the D5 ' two ends in LED D5 and the second string in the first string, makes system controller 76 can control the amount by the sodium yellow of LED D5 and D5 ' transmitting.Use extra LED to gang up often relevant to the larger lumen output of LED array 50.

Note, each string can use different switch S 1 and S1 ' to be coupled to respectively ground, as illustrated in Figure 12.System controller 76 simultaneously open and close switch S 1 and S1 ' the two.Redness the entirety mixing of the light that switch S 2 and S3 can launch from LED array 50 for fine setting and the amount of sodium yellow.This principle can be adjusted to the string of any number.In addition, when using when multiple string, specific string can be separately for the LED of a type, and other strings can be separately for the LED of another type.The principle of crossing gentle overvoltage protection is applicable to have these embodiment of multiple LED D1-D7, D1 '-D7 ' strings that are connected in series.

Depend on the disposal ability and the available memory that are associated with system controller 76, can record all kinds relevant with excess temperature condition and the information of quantity.For the embodiment more simplifying, system controller 76 can arrange simply position or enough information is stored in the non-volatile part of memory 84 to indicate at least one excess temperature situation to occur.Conventionally, system controller 76 is stored excess temperature information by excess temperature situation detected before one that enters in above-mentioned protected mode time immediately.

In one embodiment, communication port 78 is for passing through a port delivery information of system controller 76.This port is initially configured to input.But once excess temperature situation be detected, system controller 76 just can be reconfigured for output by this port, and this output to be set to logic high or low.For example, system controller 76 can be reconfigured for output by port, and port is set to logic low by simply port being connected to ground, and excess temperature situation has been experienced in logic low instruction.Therefore, investigator simply the output level of analysis port determine whether that at least one excess temperature situation occurs.In one embodiment, communication port 78 is the I/O(I/O of being coupled to system controller 76) infrared sensor of port.Alternatively, communication port 78 or other ports can be by remote equipment for receiving or access the information that is stored in memory 84.

In other embodiments, system controller 76 can be stored one or more in following:

The number of the excess temperature situation having occurred,

The temperature being associated with excess temperature situation,

Excess temperature situation goes through that how long did it last; And

Overvoltage information.　

Those skilled in the art will recognize that and come in handy and for losing efficacy or other information of performance diagnogtics storage.Except performance and diagnostic message, manufacturing information, sequence number etc. can be stored in the non-volatile part of memory 84, and memory 84 can be integrated in system controller 76, separate or its combination with system controller 76.This information can be retrieved in any known mode by communication port 78 or other I/O mechanisms.

In the normal operation period, luminescent device 10, and specifically, the operating temperature of LED array 50 will change.Light intensity and the color of unfortunately, launching from each LED of LED array 50 change with temperature conventionally.In addition, the LED of ruddiness type LED and BSY type has different reactions to temperature, and therefore, the character of the variation from light intensity and the color of its transmitting is different.But, no matter the Integral luminous object of luminescent device 10 is normally for how the intensity to expect or lumen output and temperature all generate light with the colour temperature of expecting.Therefore, following embodiment of the present invention relate to guarantee luminescent device 10 can in the operating temperature of normal range (NR), export expect lumen and reference color temperature in light.

For an embodiment, suppose that LED array 50 can depend on required lumen output, the colour temperature etc. of luminescent device 10 and have different LED configurations.Like this, different LED array 50 can have the LED of dissimilar, number or configuration.For the object of discussing, suppose and have 8 possible LED array 50 that can be provided on light source module 34 and can be controlled by system controller 76.In any given time, in 8 different LED array 50 only one will be provided on light source module 34 and by system controller 76 and control.Further the each LED array 50 of hypothesis will have some ruddiness type LED and some BSY type LED, and system controller 76 can change for driving at least one ruddiness type LED(such as LED D7) and a BSY type LED(such as LED D5) the duty ratio of pwm signal.

For each different LED array 50, curve is developed into be at first characterized in for driving ruddiness type LED D7 to keep the variation of the intensity of expectation and the duty ratio of colour temperature, and BSY type LED D5 is along with the operating temperature of light source module 34 changes and driven with fixed duty cycle.For driving the fixed reference duty ratio of BSY type LED D5 to be called as pre-calibration BSY duty ratio.Figure 13 is that diagram can be corresponding to the line chart of four curves (A, B, C and D) of four of a LED array 50 different configuration.Every curve is different, and how diagram should increase consistent lumen output and the colour temperature that keep coming selfluminous element with the pre-calibration BSY duty ratio for fixing along with the increase of operating temperature for the duty ratio of ruddiness type LED D7.Different curves can recently be determined with identical or different pre-calibration BSY duty.

Every curve can be stored in the non-volatile part of memory 84 of system controller 76 in manufacturing and configuring luminescent device 10.This curve is stored as and makes the integrated operation temperature range section of being divided into, and each section will be assigned with particular duty cycle, drives ruddiness type LED with this particular duty cycle.Alternatively, curve can be stored as the function that allows system controller 76 to carry out computed duty cycle based on current operation temperature.In a particular embodiment, can join and be stored with corresponding curvilinear correlation for the pre-calibration BSY duty ratio of every curve.Again, depend on embodiment, pre-calibration BSY duty ratio can be fixed, and for each in curve, can be identical or different.

Luminescent device 10 is manufactured to has LED array 50, and luminescent device is only corresponding from the different curves that are stored in memory 84 one.During manufacture process, identify concrete of the curve that will be used for operating to system controller 76 via communication port 78.For example, the infrared signal that indicative curve A should be used by system controller 76 can be presented to communication port 78, and system controller 76 will be stored this information in the non-volatile part of memory 84.If the calibration curve information being stored in memory 84 does not comprise pre-calibration BSY duty ratio, be also provided for system controller 76 and be stored in memory 84 for the pre-calibration BSY duty ratio of suitable curve.

Next, luminescent device 10 can be energized and be allowed to carry out preheating for calibration.During operation, system controller 76 will be determined operating temperature, and then determine the duty ratio for the pre-calibration of ruddiness type LED D7 based on operating temperature according to the selected calibration curve information being stored in memory 84.System controller 76 is also by the pre-calibration BSY duty ratio of the curvilinear correlation connection of determining and identify, and then start to use the recently driving switch S2 of duty for the pre-calibration of ruddiness type LED D7, and with recently driving switch S3 of selected pre-calibration BSY duty.At this moment, luminescent device 10 provides the light of pre-calibration, and it may not meet the specification of manufacturer for lumen, colour temperature etc.

Analyze the light of this pre-calibration, and make determining about the only no specification that meets manufacturer of pre-calibration.If do not meet specification, calculate one or two the skew in ruddiness duty ratio and the pre-calibration BSY duty ratio of pre-calibration.Wish that light output that skew sufficient to guarantee in duty ratio carrys out selfluminous element 10 meets the specification of manufacturer.Then, this skew is presented to the system controller 76 of luminescent device 10 via communication port 78, and is stored in the non-volatile part of memory 84.

In one embodiment, once these skews are stored, system controller 76 will work as below.System controller 76 will be determined operating temperature, and then based on operating temperature according to the ruddiness duty ratio that is stored in calibration curve information in memory 84 and determines pre-calibration.Then, system controller 76 is by a ruddiness duty ratio of adding pre-calibration to for the skew of ruddiness duty ratio, so that the duty ratio for the calibration of ruddiness type LED D7 to be provided.Then, system controller 76 will use the duty for the calibration of ruddiness type LED D7 recently to start driving switch S2.In the present embodiment, the skew of ruddiness duty ratio is fixed, and can not change along with operating temperature; But this is optional.The skew of ruddiness duty ratio can change along with the scope of operating temperature.For example, the skew of ruddiness duty ratio can be for the different sections of operating temperature range and different.

Similarly, the skew of BSY duty ratio is added to the pre-calibration BSY duty ratio with identified curvilinear correlation connection, so that calibration BSY duty ratio to be provided.Then system controller 76 will recently start driving switch S3 with calibration BSY duty.At this moment, luminescent device 10 provides the light of calibration, and the light of this calibration should meet the specification of manufacturer for lumen, colour temperature etc.

In other embodiments, curve also can also be developed and for the BSY duty ratio as temperature funtion.Like this, curve for ruddiness and BSY type LED can be stored in memory 84, wherein luminescent device 10 can be determined, be sent to the skew of one or two in selected ruddiness and BSY duty ratio between alignment epoch, and be applied in the operating period of luminescent device 10.As mentioned above, the principle providing is here applicable to adopt all types of LED array 50 of dissimilar LED, and is not limited to have the LED array 50 of ruddiness or BSY type LED.

Those skilled in the art will recognize that improvement and amendment to embodiments of the invention.All such improvement and amendment are all considered in the scope of here disclosed principle and claims.

Claims

1. a luminescent device, comprising:

Comprise the first LED array of at least the one LED;

Temperature sensor;

Memory, for storing skew and first calibration curve information of the first duty ratio, described the first calibration curve information definition temperature and for driving the relation between the duty ratio of at least the one LED of described the first LED array; And

System controller, is configured to:

Information based on from described temperature sensor is determined temperature;

The first corresponding pre-calibration duty ratio of temperature definite and from described the first calibration curve information;

Adjust described the first pre-calibration duty ratio with the skew of described the first duty ratio, to generate the first calibration duty ratio; And

Apparatus have described first calibration duty ratio first signal drive described at least the one LED.

2. luminescent device according to claim 1, wherein, described the first LED array comprises the LED of the first kind of the light of launching the first color and the LED of Second Type of the light of transmitting the second color, and described in making, at least the one LED is in the LED of the described first kind.

3. luminescent device according to claim 2, wherein, described the first LED array further comprises at least the two LED of Second Type, and described memory comprises the second pre-calibration duty ratio and the second duty-cycle offset, and described system controller is further configured to:

Adjust described the second pre-calibration duty ratio to generate the second calibration duty ratio with described the second duty-cycle offset; And

Apparatus have described second calibration duty ratio secondary signal drive described at least the two LED.

4. luminescent device according to claim 3, wherein, described memory comprises the information for multiple curves, wherein, for in described multiple curves each information definition temperature and for driving the relation between the duty ratio of at least one LED in corresponding one of multiple different LED arrays, wherein, comprise described the first calibration curve information for the information of described multiple curves, and described multiple different LED array comprises described the first LED array.

5. luminescent device according to claim 4, wherein, described memory further comprises multiple pre-calibration duty ratios, described multiple pre-calibration duty ratio comprises described the second pre-calibration duty ratio, and in the each and described multiple different LED array in described multiple pre-calibration duty ratios is corresponding.

6. luminescent device according to claim 5, wherein, described system controller is further configured to receive selection information from remote device, and wherein, system controller determines that with described the first calibration curve information described first calibrates duty ratio described in described selection information command.

7. luminescent device according to claim 6, wherein, generates described the second calibration duty ratio from system controller described in the described selection information command of described remote device by described the second pre-calibration duty ratio.

8. luminescent device according to claim 1, wherein, described memory comprises the information for multiple curves, wherein, for the each described information definition temperature in described multiple curves with for driving the relation between the duty ratio of at least one LED in corresponding one of multiple different LED arrays, wherein, comprise described the first calibration curve information for the described information of described multiple curves, and described multiple different LED array comprises described the first LED array.

9. luminescent device according to claim 8, wherein, described system controller is further configured to receive selection information from remote device, and wherein, system controller determines that with described the first calibration curve information described first calibrates duty ratio described in described selection information command.

10. luminescent device according to claim 1, wherein, apparatus have the described first signal of described the first calibration duty ratio drive described in before at least the one LED, described system controller is further configured to:

Information based on from described temperature sensor is determined initial temperature;

Determine the first initial pre-calibration duty ratio, the described first initial pre-calibration duty ratio is corresponding with the described initial temperature from described the first calibration curve information;

Apparatus have the first initialize signal of the described first initial pre-calibration duty ratio drive described at least the one LED.

11. luminescent devices according to claim 10, wherein, described system controller is further configured to receive described the first duty-cycle offset and described the first duty-cycle offset is stored in described memory from remote device.

12. luminescent devices according to claim 11, wherein:

Described the first LED array comprises the LED of the LED of the first kind of the light of launching the first color and the Second Type of the light of transmitting the second color, described in making, at least the one LED is in the LED of the described first kind, and the LED of wherein said Second Type comprises at least the two LED of described Second Type;

Described memory comprises the second pre-calibration duty ratio; And

Described system controller is further configured to:

Apparatus have the second initialize signal of described the second pre-calibration duty ratio drive described at least the two LED, and apparatus have described first initialize signal of the duty ratio of the described first initial pre-calibration drive described at least the one LED.

13. luminescent devices according to claim 12, wherein, described system controller is configured to:

Receive the second duty-cycle offset from described remote device;

Apparatus have described second calibration duty ratio described the second initialize signal drive described at least the two LED.

14. luminescent devices according to claim 1, wherein:

Described the first LED array comprises at least the two LED;

Described memory comprises the second duty-cycle offset and the second calibration curve information, described the second calibration curve information definition temperature and for the relation between the duty ratio of at least the two LED described in driving; And

Described system controller is further configured to:

Determine the second pre-calibration duty ratio, described the second pre-calibration duty ratio is with corresponding from the temperature of described the second calibration curve information;

15. luminescent devices according to claim 1, wherein, described the first LED array comprises the 2nd a kind of LED in a LED and transmitting yellow or the green light of launching red light.

16. luminescent devices according to claim 15, wherein, the described at least the one LED is in a described LED.

17. luminescent devices according to claim 1, wherein, other LED in described the first LED array are by DC current drives, and at least the one LED described in driving with described first signal.

18. luminescent devices according to claim 1, wherein, described luminescent device has power port, and the power supply that described power port is configured to from separating with described luminescent device receives DC electric power.

19. luminescent devices according to claim 1, wherein, described the first LED array comprises LED string, at least the one LED described in described LED string comprises.

20. luminescent devices according to claim 19, wherein, described LED string comprises the LED of the light of launching different colours.

21. 1 kinds of methods, comprising:

Analyze from the light of luminescent device transmitting, at least the one LED of described luminescent device in the first signal driving LED array with the first pre-calibration duty ratio, described the first pre-calibration duty ratio is determined by described luminescent device as the function of temperature;

Determine the first duty-cycle offset based on the difference between described light and benchmark, and be configured to adjust described the first pre-calibration duty ratio; And

Described the first duty-cycle offset is sent to described luminescent device.

22. methods according to claim 21, wherein, described luminescent device further drives at least the two LED in described LED array by the secondary signal with the second pre-calibration duty ratio, and further comprises:

Determine the second duty-cycle offset based on the difference between described light and benchmark, and be configured to adjust described the second pre-calibration duty ratio; And

Described the second duty-cycle offset is sent to described luminescent device.

23. luminescent devices according to claim 22, wherein, described the second pre-calibration duty ratio is along with temperature is fixed.

24. luminescent devices according to claim 22, wherein, described the second pre-calibration duty ratio is determined by described luminescent device as the function of temperature.

25. luminescent devices according to claim 22, wherein, the described at least the one LED launches the light of the first color, and the described at least the two LED launches the light of second color different from described the first color.