CN104633499A - LED light source module with high color rendering index and LED lamp - Google Patents

LED light source module with high color rendering index and LED lamp Download PDF

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Publication number
CN104633499A
CN104633499A CN201510063655.8A CN201510063655A CN104633499A CN 104633499 A CN104633499 A CN 104633499A CN 201510063655 A CN201510063655 A CN 201510063655A CN 104633499 A CN104633499 A CN 104633499A
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light source
led
light
led light
blue
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CN104633499B (en
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余建华
谌江波
鄂雷
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • F21S10/02—Lighting devices or systems producing a varying lighting effect changing colors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2101/00—Point-like light sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention discloses an LED light source module with a high color rendering index and an LED lamp. The LED light source module comprises a first LED light source providing warm white light, a second LED light source providing blue light, a third LED light source providing green light and a fourth LED light source providing red light, wherein the first LED light source comprises a first blue light LED chip with the peak wavelength being 442-450 nm, the first blue light LED chip is coated with green light fluorescent powder with the peak wavelength being 525-540 nm and orange fluorescent powder with the peak wavelength being 580-600 nm, and the proportions of luminous powers of blue light, green light end orange light provided in the warm white light are 0.02-0.04, 0.35-0.39 and 0.59-0.61 respectively; the second LED light source comprises a second blue light LED chip with the peak wavelength being 442-450 nm; the third LED light source comprises a green light LED chip with the peak wavelength being 490-500 nm; the fourth LED light source comprises a red light LED chip with the peak wavelength being 627-635 nm. By the adoption of the LED light source module and the LED lamp, the light distribution scheme is easy to achieve, and the light distribution effect is good.

Description

A kind of LED light source module of high color rendering index (CRI) and LED lamp
[technical field]
The present invention relates to LED illumination technology, particularly relate to a kind of LED light source module and LED lamp of high color rendering index (CRI).
[background technology]
As the lighting source of a new generation, produce the illumination scheme of white light by LED chip, because of energy-efficient, environmental protection and the feature such as the life-span is long, be widely used in lighting field.Along with growth in the living standard, the requirement of people to lighting quality is more and more higher.Not only require that adjustable color saves, and high colour rendering index will be had, particularly in some special application scenarios, as museum, hospital, fine arts room etc., require higher to colour rendering index, all more than 90, some to the requirement of special colour rendering index R9 also more than 90 or higher.
The method being produced white light by LED chip mainly contains following three kinds: (1) blue-light LED chip+YAG yellow fluorescent powder.Utilize GaN base blue-light LED chip to excite YAG fluorescent powder to send gold-tinted, produce white light with remaining blue light.By regulating and controlling the intensity of blue light and gold-tinted, the white light of different-colour can be produced.This scheme realizing white light, product and manufacture craft are relatively simple, and technology is tending towards ripe, and achieving commercialization, is the mainstream technology manufacturing white light LEDs at present.But the white light that this scheme produces can only be fixing colour temperature, and general colour rendering index Ra only has 60 ~ 80 usually, and special colour rendering index R9 is also very low, meeting that R9 is on the low side makes the color of object become dim.(2) near ultraviolet LED chip+RGB fluorescent material.The ultraviolet utilizing near ultraviolet LED chip to send excites RGB fluorescent material synthesize white light.Change photochromic by the proportioning adjusting fluorescent material, obtain required white light, and good colour temperature and development index can be obtained, but near ultraviolet LED chip applicatory not yet forms ripe application.(3) R, G, B three primary colours synthesize white light.By R, G, B three-primary color LED chip package in individual devices, by regulating the drive current of three kinds of color chips to change the proportioning of three kinds of coloured light respectively, the light of shades of colour can be obtained, the white light of broad band can also be obtained.But under this method, the more difficult light distribution scheme determining LED chip, is particularly difficult to the light distribution scheme determining to obtain having excellent fit light effect.So-called good light distribution effect, refers in wide scope, to realize adjustable color in (2700 ~ 6500K), and can keep high colour rendering index (high color rendering index (CRI) refers to that general colour rendering index Ra is more than 90) within the scope of this.
In addition, when LED chip mixed light obtains white light, also there is the defect the same with majority of illumination light source, is exactly light decay problem.It is exactly the luminous flux affecting LED that light decay the most directly shows, and light decay also can have a certain impact to colour temperature and development index, this occasion that will LED is difficult to be applied to medical treatment, photography etc. light source to be had to high request.So how effectively to reduce light decay, be also become a great problem that LED faces at present.
[summary of the invention]
Technical problem to be solved by this invention is: make up above-mentioned the deficiencies in the prior art, a kind of LED light source module and LED lamp are proposed, colour temperature can be realized adjustable within the scope of 2700K-6500K, and in this reference color temperature colour rendering index Ra, R9 more than 95, whole colour rendering index R1 ~ R15 is all more than 90, and chromaticity difference △ C is less than 0.0054.
Technical problem of the present invention is solved by following technical scheme:
A LED light source module for high color rendering index (CRI), described LED light source module comprises the first LED light source providing warm white, provides the second LED light source of blue light, provides the 3rd LED light source of green light and provides the 4th LED light source of ruddiness; Described first LED light source comprises the first blue-light LED chip that peak wavelength is 442 ~ 450nm, it being coated with peak wavelength is the green light fluorescent powder of 525 ~ 540nm and the orange light phosphor powder of 580 ~ 600nm, luminous power ratio in the described warm white provided shared by blue light is 0.02 ~ 0.04, luminous power ratio shared by green glow is 0.35 ~ 0.39, and the luminous power ratio shared by orange light is 0.59 ~ 0.61; Described second LED light source comprises the second blue-light LED chip that peak wavelength is 442 ~ 450nm; Described 3rd LED light source comprises the green light LED chip that peak wavelength is 490 ~ 500nm; Described 4th LED light source comprises the red LED chip that peak wavelength is 627 ~ 635nm.
A kind of LED lamp of high color rendering index (CRI), comprise radiator, reflection shield, diffuser plate and be provided with the substrate of LED light source module, described LED light source module comprises at least one group of LED light source module, described LED light source module is LED light source module as above, and described LED lamp also comprises four drive circuits and control circuit; The luminous flux proportioning of each LED light source and the mapping table between the colorimetric parameter mixing rear white light is stored in described control circuit, wherein under the luminous flux proportioning of each light source, each colorimetric parameter meets following condition: colour temperature is adjustable within the scope of 2700K ~ 6500K, general colour rendering index Ra >=95 of light source under each colour temperature, special colour rendering index R9 >=95, whole colour rendering index R1 ~ R15 all >=90, chromaticity difference △ C < 0.0054; Described control circuit needs the mixed colour temperature obtained to select the luminous flux proportioning of each LED light source corresponding according to user, determine the drive current of each LED light source according to the luminous flux proportioning of each LED light source, and export the drive current of calculating to corresponding drive circuit respectively; Described four drive circuits export the drive current of reception to corresponding LED light source respectively, drive corresponding LED light source luminous.
The beneficial effect that the present invention is compared with the prior art is:
LED light source module of the present invention and LED lamp, LED light source module is special the first blue-light LED chip arranged, second blue-light LED chip, green light LED chip and red LED chip, by the cooperation of each LED chip wavelength and corresponding phosphor wavelength, thus produce the mixed light of specific light spectral power distributions.Follow-up in LED lamp time, coordinate control circuit in light fixture, the mapping table between the luminous flux proportioning of each light source satisfied condition and colorimetric parameter is prestored in control circuit, the colour temperature obtained as required selects the luminous flux proportioning of each light source, determine that drive current is exported to each light source and driven luminous thus, obtain the colour temperature needed, colour rendering index Ra, R9 of the light source simultaneously obtained are all >=95, and whole colour rendering index R1 ~ R15 is all >=90, chromaticity difference △ C < 0.0054.LED lamp in the present invention, realizing under colour temperature prerequisite adjustable within the scope of 2700K ~ 6500K, display index Ra, R9 are all >=95, and whole colour rendering index R1 ~ R15 all >=90, chromaticity difference △ C < 0.0054, colorimetric parameter is better, close with natural daylight, can meet the application of high request by simulating nature light.Meanwhile, in the mixed light scheme of employing, only a LED chip and fluorescent material produce exciting light, the direct emergent light of its excess-three LED chip, produce exciting light without the need to fluorescent material, thus scheme is easy to realize controlling, and are convenient to follow-uply realize feedback regulation.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the LED lamp in the specific embodiment of the invention;
Fig. 2 is the circuit diagram of the LED lamp in the specific embodiment of the invention;
Fig. 3 is the structural representation of LED light source module in the LED lamp in the specific embodiment of the invention;
Fig. 4 is a kind of relative spectral power distributions figure combining lower each chip and fluorescent material chosen in the LED lamp in the specific embodiment of the invention;
Fig. 5 is that LED lamp in the specific embodiment of the invention is under a kind of combination and the relative spectral power distributions figure of the light of the four kinds of colors produced under one group of luminous power ratio;
Fig. 6 is the gamut range schematic diagram of the LED lamp light of four kinds of colors under a kind of combination and under one group of blue light ratio in the specific embodiment of the invention;
Fig. 7 is the method flow diagram calculating the luminous flux proportioning satisfied condition in the specific embodiment of the invention;
Fig. 8 is that LED lamp in the specific embodiment of the invention is under a kind of combination and the relative spectral power distributions figure of the white light obtained after mixed light under one group of luminous power ratio;
Fig. 9 is the workflow schematic diagram after the LED lamp in the specific embodiment of the invention is preferably arranged.
[detailed description of the invention]
Contrast accompanying drawing below in conjunction with detailed description of the invention the present invention is described in further details.
The present invention, on the basis building LED and light-emitting phosphor spectral model, furthers investigate LED mixed light scheme, under obtaining one group of LED light source assembled scheme, can realize irrealizable R1 ~ R15 in the past and all be more than or equal to the development properties of 90.Some LED light source assembled scheme in the past, such as publication date is on January 1st, 2014, publication number is in the LED lamp of CN103486466A, in any case control to adjust the luminous flux proportioning of each mixed light LED light source, all cannot obtain high R1 ~ R15 index, thus whole colour rendering index R1 ~ R15 also all >=90 when cannot realize Ra and R9 >=95 under a certain luminous flux proportioning, chromaticity difference △ C < 0.0054.This is determined by the build-in attribute participating in the spectral power distribution of the LED light source of mixed light under its LED mixed light scheme, when mixed light is the spectral power distribution in above-mentioned open scheme, because its spectral power distribution is determined, then no matter for another example what regulates the luminous power proportioning of each light participating in mixed light, also cannot realize whole colour rendering index R1 ~ R15 also all >=90.And under LED light source assembled scheme in the present invention, have adjusted the luminous power ratio of LED mixed light sources and each light component, thus obtain a kind of spectral power distribution of four kinds of light of participation mixed light newly, further combined with control and regulation, finally Ra and R9 >=95 can not only be realized, and whole colour rendering index R1 ~ R15 can also be realized all >=90, chromaticity difference △ C < 0.0054.Due to whole colour rendering index R1 ~ R15 all >=90, development properties, close to natural daylight, can meet the application of high request.
As illustrated in fig. 1 and 2, be structural representation and the circuit diagram of the LED lamp in this detailed description of the invention.LED lamp comprises radiator 1, reflection shield 2, diffuser plate 3 and is provided with the substrate 5 of LED light source module 4.Wherein, LED light source module 4 comprises at least one group of LED light source module (there is shown many groups), and LED lamp also comprises four drive circuits 701,702,703,704 and control circuit 6.
LED light source module 4 comprises many group LED light source modules, each group of LED light source module includes four LED light sources, be respectively the first LED light source 401 that warm white is provided, the second LED light source 402 of blue light is provided, the 3rd LED light source 403 of green light is provided and the 4th LED light source 404 of ruddiness is provided.
Wherein, first LED light source 401 comprises the first blue-light LED chip that peak wavelength is 442 ~ 450nm, it being coated with peak wavelength is the green light fluorescent powder of 525 ~ 540nm and the orange light phosphor powder of 580 ~ 600nm, thus the first blue-light LED chip excites the mixed fluorescent powder of described green light fluorescent powder and orange light phosphor powder to produce warm white.By regulating mixed proportion and the coated weight of each fluorescent material in mixed fluorescent powder, the luminous power ratio in the warm white of generation shared by blue light is made to be 0.02 ~ 0.04, luminous power ratio shared by green glow is 0.35 ~ 0.39, and the luminous power ratio shared by orange light is 0.59 ~ 0.61.In this detailed description of the invention, the blue-light LED chip that peak wavelength is 445nm is used to excite the mixed fluorescent powder of the orange light phosphor powder composition of the green light fluorescent powder of 538nm and 585nm to produce warm white, luminous power ratio in warm white shared by blue light is 0.027, luminous power ratio shared by green glow is 0.367, and the luminous power ratio shared by orange light is 0.606.
Second LED light source 402 comprises the second blue-light LED chip that peak wavelength is 442 ~ 450nm, provides blue light.In this detailed description of the invention, use the blue-light LED chip that peak wavelength is 445nm.
3rd LED light source 403 comprises the green light LED chip that peak wavelength is 490 ~ 500nm, provides green light.In this detailed description of the invention, use the green light LED chip that peak wavelength is 495nm.
4th LED light source 404 comprises the red LED chip that peak wavelength is 627 ~ 635nm, provides ruddiness.In this detailed description of the invention, use the red-light LED that peak wavelength is 630nm.
When each LED light source arrangement forms LED light source module, can arrange by any mode easily, such as square, rectangle, circle.Preferably, according to circular preferred embodiment as shown in Figure 3, in LED light source module, multiple LED light source is according to circular arrangement, and provides the LED light source interval of the light of different colours to arrange.Be the situation of 5 groups of LED light source module LED light source consisting modules shown in Fig. 9, along circular arc shooting in each group LED light source module is warm white LED light source 401 successively, blue light LED light source 402, green light LED light source 403, red-light LED light source 404.The order of arc shooting does not limit by figure, also can be other order arrangement, such as blue light LED light source 402, blue green light LED light source 401, green light LED light source 403, red-light LED light source 404, blue light LED light source 402, as long as the LED light source interval of the light of different colours is arranged in whole circle.Arrange according to above-mentioned circular, fashion, the light of each light source outgoing can be made to converge better, thus realize better light mixing effect.
As shown in Figure 4, be the first LED light source (mixed fluorescent powder that the blue-light LED chip being 445nm by peak wavelength excites 538nm green light fluorescent powder and 585nm orange light phosphor powder to form) chosen in this detailed description of the invention, second LED light source (blue-light LED chip of 445nm), 3rd LED light source (the green light LED chip of 495nm), the relative spectral power distributions figure of each chip, fluorescent material in the 4th LED light source (630nm red LED chip).In Fig. 4, B_445 represents blue-light LED chip, and B_495 represents green light LED chip, and G represents green light fluorescent powder, and R represents red LED chip, and O represents orange light phosphor powder.Under combinations thereof, regulate fluorescent material rubber powder ratio, mixed proportion and coated weight, the luminous power ratio in warm white shared by blue light is made to be 0.027, luminous power ratio shared by green glow is 0.367, the luminous power ratio of orange shared by light is 0.606, thus the relative spectral power distributions of warm white, blue light, green light and ruddiness that four LED light sources produce respectively as shown in Figure 5.
In Fig. 5, B_G_O represents warm white, and B_445 represents blue light, and B_495 represents green light, and R_630 represents ruddiness.Under combinations thereof and ratio, the chromaticity coordinates of the warm white of generation, blue light, green light and ruddiness is respectively: (0.41,0.49), (0.16,0.02), (0.08,0.36), (0.70,0.30), its gamut range schematic diagram is as shown in Figure 6.As can be seen from Figure 6, the square range that the chromaticity coordinates of the light of these four kinds of colors is formed, covers Energy Star gamut range, shows that light that four kinds of light under this chromaticity coordinates are mixed to get can realize colour temperature adjustable in the scope of 2700K ~ 6500K.
It should be noted that, when the combination of other value in selection range, in Fig. 5, the peak value of waveform has movement.When the luminous power ratio in warm white shared by blue light, green glow, orange light is set to other value in scope, the relative power value under respective wavelength can change to some extent, and situation is opened in the compression of waveform can be different.But no matter waveform peak moves, or Wave-shrinking changes, generally at the blue-light LED chip of 442 ~ 450nm, the mixed fluorescent powder of the green light fluorescent powder of 525 ~ 540nm and the orange light phosphor powder composition of 580 ~ 600nm, the green light LED chip of 490 ~ 500nm, under the combination of the red LED chip of 627 ~ 635nm, when in warm white, the luminous power ratio of corresponding light is in aforementioned range, after mixing, relative spectral power distributions figure and Fig. 5 of light is similar, the quadrangle that the chromaticity coordinates of the light of the four kinds of colors obtained is formed can cover Energy Star gamut range equally, it is adjustable in the scope of 2700K ~ 6500K that namely the light that four kinds of light is mixed to get can realize colour temperature equally.
In LED lamp during circuit unit work: store the luminous flux proportioning of each light source and the mapping table between the colorimetric parameter mixing rear light source in control circuit 6, wherein under the luminous flux proportioning of each light source, each colorimetric parameter meets following condition: colour temperature is adjustable within the scope of 2700K ~ 6500K, general colour rendering index Ra >=95 of light source under each colour temperature, special colour rendering index R9 >=95, whole colour rendering index R1 ~ R15 all >=90, chromaticity difference △ C < 0.0054; Control circuit needs the mixed colour temperature obtained to select the luminous flux proportioning of each light source corresponding according to user, determine the drive current of each light source according to the luminous flux proportioning of each light source, and the drive current of calculating is exported respectively to corresponding drive circuit 701,702,703 and 704.
The drive current of reception is exported to corresponding LED light source 401,402,403 and 404 by four drive circuits 701,702,703 and 704 respectively, drives corresponding LED light source luminous.No. four drive circuits 701,702,703 and 704 adopt the shaping modes of pulse width modulation PWM to drive four kinds of LED light sources respectively.PWM shaping modes regulable control be the pulsewidth of the input current of each LED light source, make LED light source always work in full amplitude current and zero, reduce the skew of chromatogram.Single-chip microcomputer can be utilized to adopt 16 bit timing devices to produce pwm signal, be divided into 65536 gray levels.Can control accuracy be improved like this, and make the change procedure of light soft.
Control circuit 6 regulates drive current by drive circuit, thus the luminous flux controlling each light source exports, the mixed white light be mixed to get under making LED lamp export corresponding light flux proportioning, thus the mixed white light exported under the colour temperature wanted, and under this colour temperature except general colour rendering index Ra, special colour rendering index R9 are all more than 95, and all colour rendering index R1 ~ R15 all more than 90.
Following detailed description, how to obtain luminous flux proportioning and after mixing light source colorimetric parameter between mapping table.
First, the colorimetric parameter such as the colour temperature of light source, colour rendering index and chromaticity difference is determined by the relative spectral power distributions of the four kinds of color of light participating in mixed light and luminous power proportioning.After mixed light, the calculating of the relative spectral power distributions S (λ) of light is as shown in formula (1):
S(λ)＝K 1*S 1(λ)+K 2*S 2(λ)+K 3*S 3(λ)+K 4*S 4(λ) (1)
Wherein, S 1(λ), S 2(λ), S 3(λ), S 4(λ) relative spectral power distributions of the warm white of participation mixed light, blue light, green light, ruddiness is respectively, K 1, K 2, K 3, K 4for participating in the luminous power proportioning corresponding to the warm white of mixed light, blue light, green light, ruddiness.So, want the colour temperature and development index of the light after determining mixed light, need know and participate in the relative spectral power distributions of LED of mixed light and the luminous power proportioning between them.As previously mentioned, when the LED chip of use and the peak wavelength of fluorescent material, when the amount of fluorescent material is determined, namely the spectral power distribution participating in four kinds of light of mixed light is (as shown in Figure 5) determined.Therefore, different luminous power proportioning combinations is set, different S (λ) can be obtained, and the value that S (λ) finally can affect colorimetric parameter (calculates colour temperature by S (λ), general colour rendering index Ra, the formula of the colorimetric parameters such as special colour rendering index R9, chromaticity difference and radiation efficiency is known).In sum, after different luminous power proportioning combined hybrid, light source has different colour temperatures, colour rendering index and chromaticity poor.
As shown in Figure 7, for calculating the method flow diagram of the luminous flux proportioning satisfied condition.As shown in Figure 7,1 is comprised the steps:) receive the relative spectral power distributions data of warm white, blue light, green light and ruddiness.2) assignment is carried out to warm white luminous power proportioning K1, blue light luminous power proportioning K2, green light luminous power proportioning K3 and ruddiness luminous power proportioning K4.3) colorimetric parameter of the rear light of mixing is calculated.Particularly, namely the relative spectral power distributions of mixed light is calculated according to above-mentioned formula (1), then the colorimetric parameter of the rear light source of mixing is calculated according to the relative spectral power distributions of light after mixing, these colorimetric parameters comprise colour temperature, general colour rendering index Ra, whole colour rendering index R1 ~ R15, chromaticity difference and radiation efficiency.Calculate above-mentioned colorimetric parameter according to the relative spectral power distributions S (λ) of light after mixing and have known computing formula, do not describe in detail at this.4) satisfied following condition is judged whether: after mixing, the colour temperature of light (can fluctuate in setting range in a certain scope of setting value, such as colour temperature setting value is 2700K, then colour temperature all can be considered that in the scope of 2695 ~ 2705K colour temperature is 2700K), general colour rendering index Ra >=95, special colour rendering index R9 >=95, whole colour rendering index R1 ~ R15 all >=90, chromaticity difference △ C < 0.0054, if, then enter step 5) export warm white luminous power proportioning K1, blue power proportioning K2, the value that green light luminous power proportioning K3 and ruddiness luminous power proportioning K4 is current, and the current colorimetric parameter value of correspondence, if not, then return step 2) assignment again, recalculates, until be met warm white luminous power proportioning K1, blue power proportioning K2, the green light luminous power proportioning K3 and ruddiness luminous power proportioning K4 of condition.
After being met the luminous power proportioning K1 of condition, K2, K3 and K4, owing to having corresponding relation between luminous power proportioning with luminous flux proportioning, therefore luminous flux proportioning can be calculated according to luminous power proportioning.Computing formula is:
&eta; n = K n * LER n &Sigma; n = 1 4 K n * LER n n = ( 1,2,3,4 )
LER = a m &Integral; &lambda; S ( &lambda; ) * V ( &lambda; ) d&lambda; &Integral; &lambda; S ( &lambda; ) d&lambda; - - - ( 3 )
In formula, η n, K n, LER ncorresponding is respectively the luminous flux proportioning of each light source (during n=1 when corresponding warm white, n=2 when corresponding blue light, n=3 when corresponding green light, n=4 corresponding ruddiness), luminous power proportioning and radiation efficiency, a mvalue be 683lm/W, V (λ) be luminosity function, the relative power spatial distribution data that S (λ) is corresponding light source.
By above-mentioned computational methods, the luminous flux proportioning of each light source and the colour temperature mixing rear light source can be obtained, general colour rendering index Ra, special colour rendering index R9, whole colour rendering index R1 ~ R15, corresponding relation between chromaticity difference △ C, and colour temperature is adjustable in the scope of 2700K ~ 6500K, general colour rendering index Ra >=95 of the rear light source of mixing under each colour temperature, special colour rendering index R9 >=95, whole colour rendering index R1 ~ R15 all >=90, chromaticity difference △ C < 0.0054.
Still with the first LED light source chosen (mixed fluorescent powder that the blue-light LED chip being 445nm by peak wavelength excites 538nm green light fluorescent powder and 585nm orange light phosphor powder to form), second LED light source (blue-light LED chip of 445nm), 3rd LED light source (the green light LED chip of 495nm), 4th LED light source (630nm red LED chip), and the luminous power ratio in the warm white that sends of the first LED light source shared by blue light is 0.027, luminous power ratio shared by green glow is 0.367, the luminous power ratio of orange shared by light be 0.606 situation be example explanation, the luminous flux proportioning of the mixed white light obtained and the corresponding relation of each colorimetric parameter are as shown in Table 1 and Table 2, obtain mixing the relative power spatial distribution of rear white light as shown in Figure 8.
Table 1 mixes Ra, △ C and LER parameter of rear white light
Table 2 mixes R1 ~ R15 parameter of rear white light
From the data of table 1 and table 2, by controlling the luminous flux proportioning of warm white, blue light, green light, ruddiness four kinds of LED, the mixed light of colour temperature corresponding under can obtaining proportioning, the scope that colour temperature can realize from 2700K to 6500K is adjustable, simultaneously, except colour rendering index Ra and R9 is all more than 95, whole colour rendering index R1 ~ R15 also all more than 90, access expansion light.Chromaticity difference △ C is all less than 0.0054, and chromaticity difference performance is fine.Radiation light efficiency (LER) is at more than 290lm/W, and maximum radiation light efficiency (LER) is 347lm/W.
Known from the relative spectral power distributions figure of the mixed white light Fig. 8, it is adjustable that this LED lamp can realize in 2700K ~ 6500K reference color temperature.
LED lamp in this detailed description of the invention, adopting four kinds of LED light sources, is adopt blue-light LED chip to excite the mixed fluorescent powder of green light fluorescent powder and orange light phosphor powder composition to produce warm white, blue-light LED chip generation blue light, green light LED chip generation green light and red LED chip to produce ruddiness respectively.By the cooperation of the luminous power ratio of the combination of the peak wavelength of certain limit and each light component, thus the four kinds of light obtaining specific light spectral power distributions carry out mixed light.Also only relate to the LED chip of three kinds of wave bands and the fluorescent material of two kinds of wave bands during mixed light, mixed light scheme is simple.During work, the electric current of different LED light sources is regulated by control circuit and drive circuit, thus regulate the luminous flux of different LED light source to export, regulate the proportioning of the luminous flux between them, mixed white light under colour temperature corresponding under obtaining each luminous flux proportioning, and the colorimetric parameter of white light is better, except Ra and R9 is more than 95, R1 ~ R15 is also all more than 90, access expansion light, colour rendering index is good, and chromaticity is poor simultaneously, radiation efficiency is also better, also can meet adjustable color, the LED lamp of this detailed description of the invention can meet the application of high request simultaneously.
Preferably, in LED lamp, reflection shield 2 is frosted reflection shield, and substrate 5 is coated with reflectance coating, diffuser plate 3 is the one in PC diffuser plate, PMMA diffuser plate or ground glass, thus improved the hot spot effect of LED lamp by arranging on lamp assembly, the uniformity of light utilization efficiency and emergent light.
Further preferably, collection and FEEDBACK CONTROL are set, thus improve LED lamp and use the colour temperature instability problem that light decay causes after a period of time.Due to long use, can there is light decay in LED lamp bead, thus cause the colour temperature of the mixed white light of LED light source module outgoing to change.The light stimulus value of colour temperature and R, G, B in white light tri-kinds of colors of the white light of outgoing is relevant, and the light stimulus value of three kinds of colors can be similar to be considered as corresponding with the 4th LED light source (red-light LED light source) in four light sources, the 3rd LED light source (green light LED light source), the second LED light source (blue light LED light source) respectively.When there is light decay, by regulating luminous flux size that is red, blue or green, blue light three kinds of LED light sources, also drive current size that is red, blue or green, blue light three kinds of LED light sources is namely regulated, and then the three-channel light stimulus value of the RGB of white light changes after making mixing, thus the color temperature value of light source can be changed, the colour temperature fluctuation that opposing light decay causes.
Particularly, LED lamp also comprises color sensor (such as TCS3414 color sensor), and color sensor is arranged in light fixture, such as, on reflection shield, for gathering the ruddiness values in the mixed white light of the outgoing of described LED light source module, green glow values and blue light values.After collection, the value of collection is exported in control circuit 6.
The standard stimulus value of the rear white light of mixing ruddiness, green glow and blue light corresponding under each colour temperature is stored in control circuit 6.As shown in table 1, to the luminous flux proportioning that should have under four LED light sources under each colour temperature, the relative spectral power distributions S (λ) of white light after mixed light can be obtained according to formula (1), in conjunction with the spectrum stimulus value of ruddiness, green glow, blue light in white light, the tristimulus values of the ruddiness of white light in CIE 1931-RGB system, green glow, blue light can be calculated.Under each colour temperature, all calculate one group of tristimulus values, namely it can be used as standard stimulus value.The corresponding relation of the values of the light of each colour temperature and RGB three kinds of colors is stored, in order to subsequent adjustment process in control circuit 6.Following feedback regulation is carried out in control circuit 6:
1) the current actual color temperature value of described white light is calculated according to the values of described collection.
2) current actual color temperature value and reference colour temperature value are compared, whether the difference of both judgements is less than or equal to △ T, and in this way, then the drive current before keeping is constant; As no, then enter step 3).Wherein, reference colour temperature value is the color temperature value of the mixed white light that user needs to obtain, such as, wish that then this step Plays color temperature value is 3000K for 3000K.△ T is the difference threshold that user sets, such as, wish the difference that only there is 50K, then △ T=50K.These two requirements set be worth with user.
3) according to the comparative result of the ruddiness gathered, green glow and the values of blue light and the standard stimulus value of ruddiness, green glow and blue light, the corresponding luminous flux proportioning regulating described 4th LED light source, the 3rd LED light source and the second LED light source respectively, and then regulate correspondingly drive current; After adjustment, return step 1), re-adjustments process, until the difference of current actual color temperature value and reference colour temperature value is less than △ T.
After arranging color sensor and control circuit according to aforesaid way, as shown in Figure 9, the course of work of LED lamp is as follows:
During initialization, user sets the colour temperature of needs, and the colour temperature shelves of light fixture are adjusted to this shelves.During initialization, produce initial pwm control signal in control circuit 6, light fixture is initialized.Certainly, in initialization procedure, user also sets the colour temperature difference threshold △ T of permission.
During feedback regulation, when user being initialized, the colour temperature of selection is as reference colour temperature value, the values of R, G, B tri-kinds of colors under control circuit 6 (such as MCU) middle preservation reference colour temperature value and this standard color temperature.Control circuit 6 exports drive current corresponding to four kinds of LED light sources to drive circuit 701,702,703 and 704, regulates the current duty cycle of warm white, indigo plant, green grass or young crops, ruddiness four kinds of LED light sources respectively, thus in light fixture, realize the white light of specifying colour temperature.Herein, when implementing above-mentioned feedback regulation, the first LED light source (warm white) is not regulated, namely remain that the former drive current exporting drive circuit 701 to is constant.And by R, G, B respectively corresponding ruddiness, green light, blue light regulate, the corresponding drive current regulating drive circuit 704,703 and 702.
Color sensor gathers R, G, B tristimulus values of the white light of outgoing, the tristimulus value of collection is fed back in MCU, the color temperature value of light source is gone out by Conversion Calculation, during conversion, such as, the x on chromatic diagram can be converted into according to Commission International de L'Eclairage (CIE) standard, y chromaticity coordinates, then extrapolated the current actual color temperature value of light source by x, y chromaticity coordinates according to formula.This actual colour temperature is compared with standard color temperature, if this colour temperature difference is larger, such as more than 50K (this scope can free setting), then again R, G, B tristimulus values of collection is compared with the tristimulus values of standard, drive current is regulated according to comparative result, can adopt PWM regulative mode herein, regulate the dutycycle of drive current of corresponding indigo plant, green grass or young crops, red three kinds of LED light sources, then the colour temperature of light fixture will change.Certainly, also can adopt all the other regulative modes, such as PFM regulates or PFM and PWM regulates the mode combined.Such as, R, G, B tristimulus values of collection is drawn with after the tristimulus values of standard, R values is bigger than normal than standard value, G values is less than normal than standard value, B values is equal, then regulated the current duty cycle reducing red-light LED light source (the 4th LED light source) by PWM, increases the current duty cycle of green light LED light source (the 3rd LED light source), keep the current duty cycle of blue light LED light source (the second LED light source) constant, the colour temperature of light fixture changes.Then color sensor gathers R, G, B tristimulus values of mixed white light again, the tristimulus values of collection is fed back in MCU, circulation like this, until the actual colour temperature of the light source collected is in the zone of reasonableness (upper and lower △ T scope) of standard color temperature, thus realize the stable of light source color temperature.
Certainly, in the course of the work, if user wants to reset color temperature shelves, when then reinitializing, first be adjusted to corresponding colour temperature shelves, then again receive new colour temperature file data in control circuit, redefine the standard stimulus value of ruddiness, green glow and blue light in the mixed white light under these colour temperature shelves, then carry out above-mentioned closed-loop control link.
In the light distribution scheme of this detailed description of the invention, participate in four light sources of mixed light, only a LED chip relates to coating fluorescent material and produce exciting light, its excess-three LED light source is all directly adopt LED chip luminous, do not relate on chip and apply fluorescent material, be that simple LED chip participates in mixed light, therefore can be regarded as the correspondence of RGB tri-kinds of color of light, realize above-mentioned feedback regulation, thus guarantee that LED lamp still has stable colour temperature after a longer time of use.
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, make some substituting or obvious modification without departing from the inventive concept of the premise, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.

Claims (8)

1. a LED light source module for high color rendering index (CRI), is characterized in that: described LED light source module comprises the first LED light source providing warm white, provides the second LED light source of blue light, provides the 3rd LED light source of green light and provides the 4th LED light source of ruddiness; Described first LED light source comprises the first blue-light LED chip that peak wavelength is 442 ~ 450nm, it being coated with peak wavelength is the green light fluorescent powder of 525 ~ 540nm and the orange light phosphor powder of 580 ~ 600nm, luminous power ratio in the described warm white provided shared by blue light is 0.02 ~ 0.04, luminous power ratio shared by green glow is 0.35 ~ 0.39, and the luminous power ratio shared by orange light is 0.59 ~ 0.61; Described second LED light source comprises the second blue-light LED chip that peak wavelength is 442 ~ 450nm; Described 3rd LED light source comprises the green light LED chip that peak wavelength is 490 ~ 500nm; Described 4th LED light source comprises the red LED chip that peak wavelength is 627 ~ 635nm.
2. the LED lamp of a high color rendering index (CRI), comprise radiator, reflection shield, diffuser plate and be provided with the substrate of LED light source module, it is characterized in that: described LED light source module comprises at least one group of LED light source module, described LED light source module is LED light source module as claimed in claim 1, and described LED lamp also comprises four drive circuits and control circuit; The luminous flux proportioning of each LED light source and the mapping table between the colorimetric parameter mixing rear white light is stored in described control circuit, wherein under the luminous flux proportioning of each light source, each colorimetric parameter meets following condition: colour temperature is adjustable within the scope of 2700K ~ 6500K, general colour rendering index Ra >=95 of light source under each colour temperature, special colour rendering index R9 >=95, whole colour rendering index R1 ~ R15 all >=90, chromaticity difference △ C < 0.0054; Described control circuit needs the mixed colour temperature obtained to select the luminous flux proportioning of each LED light source corresponding according to user, determine the drive current of each LED light source according to the luminous flux proportioning of each LED light source, and export the drive current of calculating to corresponding drive circuit respectively; Described four drive circuits export the drive current of reception to corresponding LED light source respectively, drive corresponding LED light source luminous.
3. LED lamp according to claim 2, it is characterized in that: described LED lamp also comprises color sensor, described color sensor for gather described LED light source module outgoing mixing after the values of ruddiness, green glow and blue light in white light, and export the value of collection to described control circuit; Also store the standard stimulus value of the rear white light of mixing ruddiness, green glow and blue light corresponding under each colour temperature in described control circuit, described control circuit is also for carrying out following feedback regulation:
1) the current actual color temperature value of described white light is calculated according to the values of described collection;
2) current actual color temperature value and reference colour temperature value are compared, whether the difference of both judgements is less than or equal to △ T, in this way, then keeps described drive current constant; As no, then enter step 3); Wherein, reference colour temperature value is the color temperature value of the mixed white light that user needs to obtain, and △ T is the difference threshold that user sets;
3) according to the comparative result of the ruddiness gathered, green glow and the values of blue light and the standard stimulus value of ruddiness, green glow and blue light, the corresponding luminous flux proportioning regulating described 4th LED light source, the 3rd LED light source and the second LED light source respectively, and then regulate correspondingly drive current; After adjustment, return step 1), re-adjustments process, until the difference of current actual color temperature value and reference colour temperature value is less than △ T.
4. LED lamp according to claim 2, is characterized in that: in described LED light source module, multiple LED light source is according to circular arrangement, and provides the LED light source interval of the light of different colours to arrange.
5. LED lamp according to claim 2, is characterized in that: described four drive circuits adopt the mode of pulse width modulation (PWM) to regulate drive current.
6. LED lamp according to claim 2, is characterized in that: described reflection shield is frosted reflection shield.
7. LED lamp according to claim 2, is characterized in that: described substrate is coated with reflectance coating.
8. LED lamp according to claim 2, is characterized in that: described diffuser plate is PC diffuser plate, PMMA diffuser plate or ground glass.
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WO2023005322A1 (en) * 2021-07-27 2023-02-02 荣耀终端有限公司 Backlight source and manufacturing method therefor, display apparatus, and electronic device
CN114484381A (en) * 2022-01-21 2022-05-13 漳州立达信光电子科技有限公司 Luminous unit for human-induced lighting and lamp composed of luminous unit
CN115665919A (en) * 2022-11-21 2023-01-31 四川世纪和光科技发展有限公司 LED color temperature adjustable device and use method
CN115665919B (en) * 2022-11-21 2023-05-02 四川世纪和光科技发展有限公司 LED adjustable temperature device and use method

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