Light source module, lighting system and lamp

Abstract

The light source module comprises a first light-emitting unit, a second light-emitting unit, a third light-emitting unit and a fourth light-emitting unit which are electrically independent from one another and have different light colors, and the light color of the single-color light-emitting unit is optimized by the light source module, so that the color temperature coverage range of white light obtained by light mixing is wide; compared with the prior art, the light source module has the advantages that the coverage range is from 1800 K to 20000 K, meanwhile, the light source module has good color rendering property, the color rendering index CRI is larger than 90 in the color temperature range of 1800-20000 K, the color rendering index CRI is larger than 95 in the color temperature interval range of 2100-20000 K, the light quality of the light source module is superior to that of an existing RGB, RGBW and other all-in-one light source, and the light source module is more suitable for the field of general indoor illumination. Meanwhile, color light can be compatible by controlling the multiple light emitting units, and a multi-color light mixing system capable of giving consideration to high-quality white light and color light atmosphere at the same time is formed.

Description

Technical Field

[0001] The present invention relates to a light source module, a lighting system and a lighting fixture. Background Art

[0002] Among various light sources, due to the low power consumption and high luminous efficiency of light-emitting diodes (LEDs), they are widely used in various lighting devices, such as indoor and outdoor lighting, intelligent lighting, plant lighting, vehicle lighting, indoor and outdoor display lighting, etc.

[0003] Generally, when it comes to the need for dimming and color adjustment, one solution is to use red, green, and blue primary colors for color adjustment. The light-emitting diodes used in this three-primary-color mixing method mainly consist of single-wavelength LED chips. In this case, since the full-width at half-maximum (FWHM) of various monochromatic spectra is relatively narrow and cannot ensure a sufficient color rendering index, there are limitations in achieving the desired white light.

[0004] In terms of color temperature adjustment, usually the method of two-color temperature dimming is adopted, and the color temperature can be adjusted by mixing two white lights with different color temperatures. The adjustable color temperature range is limited. In addition, since its dimming trajectory is the two-point connection line of the color coordinates of the two color temperatures on the CIE 1931 chromaticity diagram, when adjusted to the intermediate color temperature, there is a relatively large deviation between its light color and the standard light source of the same color temperature.

[0005] In addition, in order to further expand the overall white light color temperature range, generally, red, green, and blue primary colors are superimposed on the original single-color temperature or two-color temperature white light for dimming and color adjustment, that is, the RGBW or RGBCW multi-color mixing method. And this mixing method is: when the color temperature target value is within the single-color temperature or two-color temperature white light range, the main body participating in the mixing is these white lights. When its color temperature target value exceeds the range, red, green, and blue primary colors are used for mixing or in a way of compensating colors to obtain the white light of the required target color temperature. No matter which method is adopted, the white light obtained by this type of mixing can only be guaranteed in the color temperature range covered by the existing white light in terms of the performance of color rendering. When exceeding this range, since the light-emitting diodes used for the three primary colors mainly consist of single-wavelength LED chips and the full-width at half-maximum of various monochromatic colors is relatively narrow, the spectral continuity of the white light obtained by their mixing is poor, and it cannot ensure that the color rendering index of the overall white light is still at a high level. With the improvement of people's living standards, the demand for lighting is more diverse. How to provide a lighting device that can present a wide color gamut and has high light quality has become an urgent problem to be solved. Summary of the Invention

[0006] The purpose of the present invention is to solve the above problems and propose a multi-color light source module, a lighting system and a lighting fixture that can simultaneously take into account high-quality white light and colored light atmosphere.

[0007] To achieve the above functions, the technical solution adopted by the present invention is to provide a light source module, which is characterized in that it includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are electrically independent of each other;

[0008] The first light-emitting unit includes a first LED chip, a first encapsulation body covering the first LED chip, and a first phosphor. The wavelength of the main emission peak of the light emitted by the first light-emitting unit is between 445-460 nm, the wavelength of the secondary emission peak is between 480-500 nm, and the peak energy of the secondary emission peak is 10-50% of the peak energy of the main emission peak. Its light color is blue-green light located within the quadrilateral region enclosed by four points A1(0.18, 0.22), A2(0.22, 0.28), A3(0.24, 0.21), and A4(0.19, 0.18) on the 1931 CIE chromaticity diagram;

[0009] The second light-emitting unit includes a second LED chip, a second encapsulation body covering the second LED chip, and a second phosphor. The wavelength of the main emission peak of the light emitted by the second light-emitting unit is between 530-580 nm, and the spectral half-width is 90-130 nm. Its light color is yellow-green light located within the quadrilateral region enclosed by four points B1(0.38, 0.51), B2(0.40, 0.58), B3(0.45, 0.53), and B4(0.43, 0.46) on the 1931 CIE chromaticity diagram;

[0010] The third light-emitting unit includes a third LED chip, a third encapsulation body covering the third LED chip, and a third phosphor. The wavelength of the main emission peak of the light emitted by the third light-emitting unit is between 620-655 nm, the wavelength of the secondary emission peak is between 550-580 nm, and the peak energy of the secondary emission peak is 0-40% of the peak energy of the main emission peak. Its light color is orange-red light located within the quadrilateral region enclosed by four points C1(0.55, 0.40), C2(0.56, 0.44), C3(0.68, 0.32), and C4(0.65, 0.31) on the 1931 CIE chromaticity diagram.

[0011] Further, the blue light content of the second light-emitting unit is less than 30%, and the blue light content of the third light-emitting unit is less than 10%.

[0012] Further, the first LED chip, the second LED chip, and the third LED chip include at least two types of LED chips, one with a peak wavelength of 450-465 nm and the other with a peak wavelength of 445-455 nm, and the difference between the peak wavelengths of the two types of LED chips is greater than or equal to 5 nm.

[0013] Further, the first phosphor includes at least one blue-green phosphor with a peak wavelength in the range of 485 - 515 nm and at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm. The blue-green phosphor is (Ba,Sr)Si 2 N 2 O 2 :Eu; the yellow-green phosphor is (Lu,Yb,Tb) 3 (Al,Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al,Ga) 5 O 12 :Ce.

[0014] Further, the second phosphor includes at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm. The yellow-green phosphor is (Lu,Yb,Tb) 3 (Al,Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al,Ga) 5 O 12 :Ce.

[0015] Further, the third phosphor includes at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm and at least one red phosphor with a peak wavelength in the range of 620 - 655 nm. The yellow-green phosphor is (Lu,Yb,Tb) 3 (Al,Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al,Ga) 5 O 12 :Ce; the red phosphor is CaAlSiN 3 :Eu, (Ca,Sr)AlSiN 3 :Eu, (Ba,Sr,Ca,Mg) 2 Si 5 N 8 :Eu, K 2 SiF 6 :Mn 4+ 、K 2 GeF6 : Mn 4+ , K 2 TiF 6 : Mn 4+ .

[0016] Furthermore, the white light formed by the mixed light emission of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit has an adjustable color temperature in the range of 1800 - 20000K, and the color deviation Duv from the blackbody radiation line is less than 0.003.

[0017] Furthermore, the color rendering index CRI of the white light formed by the mixed light emission of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is greater than 90 within the color temperature range of 1800 - 20000K.

[0018] Furthermore, the light source module further includes a fourth light-emitting unit, and the fourth light-emitting unit includes a fourth LED chip, a fourth encapsulation body covering the fourth LED chip, and a fourth phosphor. The fourth light-emitting unit emits white light with a color temperature of 4000K ± 250K, a color rendering index greater than 90, and an MDER greater than 0.65; or a color temperature of 5000 ± 250K, a color rendering index greater than 90, and an MDER greater than 0.75.

[0019] Furthermore, the fourth phosphor includes at least one blue-green phosphor with a peak wavelength in the range of 485 - 515nm, at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580nm, and at least one red-orange phosphor with a peak wavelength in the range of 615 - 655nm. The blue-green phosphor is (Ba,Sr)Si 2 N 2 O 2 : Eu; the yellow-green phosphor is (Lu,Yb,Tb) 3 (Al,Ga) 5 O 12 : Ce, Ga-Y 3 Al 5 O 12 : Ce, Y 3 (Al,Ga) 5 O 12 : Ce, (Ba,Sr,Ca,Mg)SiO 4 : Eu; the red-orange phosphor is CaAlSiN 3 : Eu, (Ca,Sr)AlSiN 3 : Eu, (Ba,Sr,Ca,Mg) 2 Si 5 N 8 : Eu, K 2 SiF 6 : Mn4+ , K 2 GeF 6 :Mn 4+ , K 2 TiF 6 :Mn 4+ .

[0020] Furthermore, the light source module is a packaged chip, which includes a main body portion. A first accommodation groove, a second accommodation groove, a third accommodation groove and a fourth accommodation groove are provided on the main body portion. The first LED chip and the first phosphor, the second LED chip and the second phosphor, the third LED chip and the third phosphor, and the fourth LED chip and the fourth phosphor are respectively arranged in the first accommodation groove, the second accommodation groove, the third accommodation groove and the fourth accommodation groove. The first encapsulation body, the second encapsulation body, the third encapsulation body and the fourth encapsulation body respectively fill the first accommodation groove, the second accommodation groove, the third accommodation groove and the fourth accommodation groove and cover the first LED chip, the second LED chip, the third LED chip and the fourth LED chip.

[0021] Furthermore, the light source module includes a light source board. The first light emitting unit, the second light emitting unit, the third light emitting unit and the fourth light emitting unit are arranged on the light source board. The first lens, the second lens, the third lens and the fourth lens respectively cover the first light emitting unit, the second light emitting unit, the third light emitting unit and the fourth light emitting unit. The first lens, the second lens, the third lens and the fourth lens are convolute lenses. The first lens, the second lens and the third lens are evenly distributed around the fourth lens along the circumference.

[0022] Furthermore, when the white light color temperature emitted by the light source module is in the range of 2100 - 20000K, the color rendering index CRI is greater than 95.

[0023] This application also provides an illumination system, which is characterized by including: a light source and a driving circuit,

[0024] The light source includes at least one light source module as described above;

[0025] The driving circuit is respectively electrically connected to the first light emitting unit, the second light emitting unit and the third light emitting unit and supplies power to them. The driving circuit controls the current / voltage provided to the first light emitting unit, the second light emitting unit and the third light emitting unit respectively.

[0026] Furthermore, the driving circuit includes:

[0027] A power conversion module, which converts an external power supply into a DC power supply required by the light source module;

[0028] A control module that generates control signals;

[0029] An LED driving module that receives the DC power output by the power conversion module and the control signals transmitted by the control module, adjusts the DC power according to the control signals, and is electrically connected to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit respectively, and outputs the adjusted driving current / voltage required by each light-emitting unit.

[0030] Further, the control signal is a PWM signal.

[0031] Further, the control module includes a communication module that receives dimming / color-tuning commands transmitted from the outside and generates the control signals accordingly.

[0032] Further, the control module includes a storage module that stores preset control parameter values. The control parameter values are the control parameter values corresponding to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit when the light source module generates different color temperatures. The light source module is controlled according to the control parameter values. The color temperature of the white light emitted by the light source module is adjustable within the range of 1800 - 20000K, and the color deviation Duv from the blackbody radiation line is less than 0.003.

[0033] Further, when the light source module is controlled according to the control parameter values, the color rendering index CRI of the white light formed by the light emission mixing of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is greater than 90 within the color temperature range of 1800 - 20000K.

[0034] Further, the light source module further includes a fourth light-emitting unit. The fourth light-emitting unit includes a fourth LED chip, a fourth encapsulation body covering the fourth LED chip, and a fourth phosphor. The fourth light-emitting unit emits white light, and its color temperature is 4000K ± 250K, the color rendering index is greater than 90, and the MDER is greater than 0.65; or the color temperature is 5000 ± 250K, the color rendering index is greater than 90, and the MDER is greater than 0.75.

[0035] The driving circuit is electrically connected to the fourth light-emitting unit and supplies power to it, and is independent of other light-emitting units to control the current / voltage of the fourth light-emitting unit.

[0036] Further, when the light source module is controlled according to the control parameter values, when the color temperature of the obtained white light is within the range of 2100 - 20000K, the color rendering index CRI is greater than 95.

[0037] Further, the light source includes more than two of the light source modules, and the first light-emitting units, the second light-emitting units, and the third light-emitting units in each of the light source modules are respectively connected in series and then electrically connected to the LED driving module.

[0038] The present application also provides a lighting fixture, which is characterized by including the light source module or the lighting system as described above.

[0039] For the light source module, lighting system, and lighting fixture provided by the present application, by optimizing the light color of the monochromatic light-emitting units in the light source module, the white light color temperature covered by the mixed light has a wide range, covering from 1800K to 20000K. At the same time, the light source module has good color rendering properties. In the color temperature range of 1800 - 20000K, the color rendering index CRI is greater than 90, and in the color temperature range of 2100K - 20000K, the color rendering index CRI is greater than 95, which is superior to the light quality of existing multi-in-one light sources such as RGB and RGBW, and is more suitable for the general indoor lighting field. At the same time, by controlling multiple light-emitting units, colored light can be compatible to form a multi-color mixed light system that can take into account both high-quality white light and colored light atmosphere. Description of the Drawings

[0040] Figure 1 is a schematic structural diagram of a light source module according to a preferred embodiment of the present invention;

[0041] Figure 2 is a chromaticity point distribution diagram of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit in the light source module of the preferred embodiment of the present invention on the CIE 1931 chromaticity diagram;

[0042] Figure 3 is a spectral energy distribution diagram of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit in the light source module of the preferred embodiment of the present invention;

[0043] Figure 4a 、 4b 、4c is a spectral energy distribution diagram of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit in the light source module of the preferred embodiment of the present invention when emitting and mixing different color temperature white lights;

[0044] Figure 5a 、 5b 、5c is a spectral energy distribution diagram of the light source module at different color temperatures when the fourth light-emitting unit in the light source module of the preferred embodiment of the present invention is selected as 4000K white light;

[0045] Figure 6a 、 6b 、6c is a spectral energy distribution diagram of the light source module at different color temperatures when the fourth light-emitting unit in the light source module of the preferred embodiment of the present invention is selected as 5000K white light;

[0046] Figure 7a 、 7b Figures 7c, 7d, 7e, and 7f are schematic diagrams of the packaging structures of light source modules according to other preferred embodiments of the present invention;

[0047] Figure 8 is a schematic diagram of the structure of a lighting system according to a preferred embodiment of the present invention;

[0048] Figure 9 is a schematic diagram of the structure of a lamp according to a preferred embodiment of the present invention;

[0049] Figure 10 is a schematic diagram of the structure of a light source module according to another preferred embodiment in line with the present invention;

[0050] Figure 11 is Figure 10 the optical path diagram of a single lens in

[0051] Figure 12 is Figure 10 the comparison diagram of the diameters of each lens in Detailed Embodiments

[0052] The following further describes in detail a light source module, a lighting system, and a lamp proposed by the present invention in conjunction with the accompanying drawings and some preferred embodiments in line with the present invention.

[0053] A specific embodiment of the light source module of the present invention is a mixed-light LED packaging chip, and the packaging form can be PLCC chip-on-board packaging, ceramic chip-on-board packaging, CSP packaging, multi-in-one single-chip chip-on-board packaging, or COB chip integrated packaging, which is not limited in this application.

[0054] The structure of a specific embodiment is as shown in Figure 1As shown, the light source module 1 includes a main body portion 60 and a plurality of light-emitting units arranged on the main body portion 60 and spaced apart from each other - a first light-emitting unit 100, a second light-emitting unit 200, a third light-emitting unit 300, and a fourth light-emitting unit 400. Each light-emitting unit 100, 200, 300, 400 includes an LED chip 101, 201, 301, 401 and a package body 102, 202, 302, 402 covering the LED chip. The LED chip (LED Chip) includes a flip-chip or a surface-mount chip, and a single LED chip or multiple LED chips are connected in series, parallel, or series-parallel. In this embodiment, in order to accommodate the package bodies 102, 202, 302, 402, the main body portion 60 is a plastic bracket, and a plurality of accommodating grooves 61, 62, 63, 64 are provided therein. The material of the plastic bracket can be any one of PPA, PCT, and EMC. Each LED chip 101, 201, 301, 401 is respectively arranged in the accommodating grooves 61, 62, 63, 64 and is provided with a pair of pins 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b. The pins 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b are electrically isolated from each other. The package bodies 102, 202, 302, 402 are made of a silicone-based resin, an epoxy resin, or a combination thereof, and are respectively filled into the accommodating grooves 61, 62, 63, 64 and cover each LED chip 101, 201, 301, 401 to ensure electrical isolation between the light-emitting units 100, 200, 300, 400.

[0055] In this embodiment, a light mixing scheme of multiple light sources is adopted. Among them, the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 respectively emit blue-green light, yellow-green light, and orange-red light. The combination of these three can form white light, as follows.

[0056] The first light-emitting unit 100 includes a first LED chip 101, a first encapsulant 102, and a first phosphor. The first LED chip 101 is placed at the bottom of the first receiving groove 61 and is electrically connected to the outside through two pins 51a and 51b. The first encapsulant 102 fills the first receiving groove 61 and covers the first LED chip 101. The first LED chip 101 is a blue LED that emits blue light with a peak wavelength in the range of 450 - 465 nm. The first encapsulant 102 contains a first phosphor 103, and the first phosphor 103 includes at least one blue-green phosphor with a peak wavelength in the range of 485 - 515 nm and at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm. In order to obtain a wider FWHM, the first phosphor 103 contains both blue-green and yellow-green phosphors with different peak wavelengths. Of course, the blue-green phosphor and the yellow-green phosphor mentioned here do not limit them to only one chemical composition, and they can still be mixed phosphors respectively, that is, more than one phosphor can be mixed to finally form the required blue-green phosphor or yellow-green phosphor. Among them, the blue-green phosphor can be (Ba,Sr)Si 2 N 2 O 2 :Eu. And the yellow-green phosphor can be selected from (Lu, Yb, Tb) 3 (Al,Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al,Ga) 5 O 12 :Ce or any one of them or a combination of multiple of them. After the first LED chip 101 excites the first phosphor 103, the spectral energy distribution of the light emitted by the first light-emitting unit 100 is shown as curve 100 in Figure 3 . Figure 3 is a relative spectral intensity diagram, and each curve in the figure has been normalized. Each point on the curve represents the energy magnitude at a certain wavelength on the horizontal axis. The wavelength of the main emission peak of the light emitted by the first light-emitting unit 100 is between 445 - 460 nm, and the wavelength of the secondary emission peak is between 480 - 500 nm, and the peak energy of the secondary emission peak is 10 - 50% of the peak energy of the main emission peak. The light color of the light emitted by the first light-emitting unit 100 is blue-green and is located in the quadrilateral area enclosed by four points A1(0.18,0.22), A2(0.22,0.28), A3(0.24,0.21), A4(0.19,0.18) on the 1931 CIE chromaticity diagram, that is, Figure 2 the A area marked in.

[0057] The second light-emitting unit 200 includes a second LED chip 201 and a second encapsulation body 202. The second LED chip 201 is placed at the bottom of the second receiving groove 62 and is electrically connected to the outside through two pins 52a and 52b. The second encapsulation body 202 fills the second receiving groove 62 and covers the second LED chip 201. The second LED chip 201 is a blue LED that emits blue light with a peak wavelength in the range of 445 - 455 nm. The second encapsulation body 202 contains a second phosphor 203, and the second phosphor 203 includes at least one yellow-green phosphor. The yellow-green phosphor can be selected from 3 (Al, Ga) 5 O 12 :Ce, Ga - Y 3 Al 5 O 12 :Ce, Y 3 (Al, Ga) 5 O 12 :Ce or any combination of multiple thereof. After the second LED chip 201 excites the second phosphor 203, the light emitted by the second light-emitting unit 200 has a peak wavelength in the range of 530 - 580 nm and a spectral half-width of 90 - 130 nm. Here, the spectral half-width refers to the full-width at half-maximum (FWHM) of an emission peak on the spectrogram. Its spectral energy distribution is shown as curve 200 in Figure 3 The light color of the light emitted by the second light-emitting unit 200 is yellow-green and is located within the quadrilateral region enclosed by four points B1(0.38, 0.51), B2(0.40, 0.58), B3(0.45, 0.53), and B4(0.43, 0.46) on the 1931 CIE chromaticity diagram, that is, the B region marked in Figure 2 Since most of the energy emitted by the second LED chip 201 is converted into yellow-green light by the second phosphor 203, the blue light content of the light emitted by the second light-emitting unit 200 is less than 30%. The blue light content being less than 30% means that in the light emitted by the light-emitting unit, the proportion of the energy in the blue light band of 440 - 480 nm in the total energy is less than 30%.

[0058] The third light-emitting unit 300 includes a third LED chip 301 and a third encapsulation body 302. The third LED chip 301 is placed at the bottom of the third receiving groove 63 and is electrically connected to the outside through two pins 53a and 53b. The third encapsulation body 302 fills the third receiving groove 63 and covers the third LED chip 301. The third LED chip 301 is a blue LED that emits blue light with a peak wavelength in the range of 445 - 455 nm. The third encapsulation body 302 contains a third phosphor 303, and the third phosphor 303 includes at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm and at least one red phosphor with a peak wavelength in the range of 620 - 655 nm. The third phosphor 303 needs to include both yellow-green and red phosphors simultaneously. Of course, each of these two phosphors can also be a mixed phosphor. The yellow-green phosphor can be selected from (Lu,Yb,Tb) 3 (Al,Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al,Ga) 5 O 12 :Ce or any combination of them. The red phosphor can be selected from CaAlSiN 3 :Eu, (Ca,Sr)AlSiN 3 :Eu, (Ba,Sr,Ca,Mg) 2 Si 5 N 8 :Eu, K 2 SiF 6 :Mn 4+ , K 2 GeF 6 :Mn 4+ , K 2 TiF 6 :Mn 4+ or any combination of several of them. After the third phosphor 303 is excited by the third LED chip 301, the wavelength of the main emission peak of the light emitted by the third light-emitting unit 300 is between 620 - 655 nm, the wavelength of the secondary emission peak is between 550 - 580 nm, and the peak energy of the secondary emission peak is 0 - 40% of the peak energy of the main emission peak. Its spectral energy distribution is shown as curve 300 in Figure 3 The color of the light emitted by the third light-emitting unit 300 is orange-red, and it is located within the quadrilateral area enclosed by four points C1(0.55,0.40), C2(0.56,0.44), C3(0.68,0.32), C4(0.65,0.31) on the 1931 CIE chromaticity diagram, that is Figure 2The C area marked in the figure. Since most of the energy emitted by the third LED chip 301 is converted into orange-red light by the second phosphor 303, the blue light content of the third light-emitting unit 300 is less than 10%.

[0059] As can be seen in the above embodiments, although the first LED chip 101, the second LED chip 201, and the third LED chip 301 are all blue light chips, LEDs with different peak wavelengths are selected. Phosphors usually have a relatively wide distribution in terms of full-width at half-maximum (FWHM), while the FWHM of monochromatic LED chips is relatively narrow. In this embodiment, although blue-green phosphor is selected in the first light-emitting unit 100, some blue light fails to be converted to maintain the energy in the blue light band, so that there is energy distribution at each wavelength to ensure good color rendering. In the case of the blue light part, when the FWHM of the LED chip is relatively narrow, selecting chips with different peak wavelengths can form a superposition form in the blue light band, so that the overall energy distribution in the blue light area is more uniform and the color rendering is better. In this embodiment, two types of LED chips are selected. The first LED chip 101 is the first type, with a peak wavelength in the range of 450 - 465 nm. The second LED chip 201 and the third LED chip 301 are of the same type, the second type, with a peak wavelength in the range of 445 - 455 nm. In the preferred solution, the difference between the peak wavelengths of the two types of LED chips should be greater than or equal to 5 nm. In other preferred embodiments, the first LED chip 101, the second LED chip 201, and the third LED chip 301 can all be different, so that the FWHM can be wider. However, since each LED chip in the light source module 1 is powered and controlled separately, too many LED selections may make the control settings more complicated, and can be flexibly selected according to the design requirements.

[0060] As we all know, the three primary colors can be mixed to form white light. In previous solutions, white light was formed by mixing RGB three colors of light. In this embodiment, the existing RGB solution is optimized, and different light colors are selected. The first light-emitting unit 100 emits blue-green light, the second light-emitting unit 200 emits yellow-green light, and the third light-emitting unit 300 emits orange-red light. The light emitted by these three can also be mixed to form white light. By separately dimming and controlling these three light-emitting units, white light of various different color temperatures can be mixed. In this embodiment, we use the PWM signal as the control signal, and independently control the three color light-emitting units through the PWM dimming method, and apply different duty cycles to modulate the light-emitting power of each light-emitting unit to achieve the light mixing effect. Table 1 lists the duty cycles of the PWM signals for modulating the three light-emitting units under different conditions, as well as the relative color temperature CCT, color deviation Duv, and color rendering index CRI after light mixing.

[0061] Table 1

[0062]

[0063] The relative spectral diagrams of white light in the columns listed in the table are as Figure 4a , Figure 4b , Figure 4c shown. Among them, Figure 4a corresponds to categories Tri_a1, Tri_b1, and Tri_c1, Figure 4b corresponds to categories Tri_d1, Tri_e1, and Tri_f1, Figure 4c corresponds to categories Tri_g1, Tri_h1, and Tri_i1. As can be seen from Table 1, in this embodiment, the white light emitted after mixing the light of the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 has a wide color temperature coverage range, which can be achieved from 1800 - 20000K. Moreover, the color deviation Duv from the blackbody radiation line is less than 0.003, and good color rendering can be achieved. The color rendering index CRI of each color temperature is greater than 90.

[0064] In the relationship between the relative color temperature and the color rendering index of the light source module 1 shown in Table 1, there is still room for improvement in the color rendering index in the intermediate color temperature range. As a preferred embodiment of the invention, on the basis of the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 of the light source module 1, a fourth light-emitting unit 400 is added to further optimize the overall light quality level.

[0065] The fourth light-emitting unit 400 includes a fourth LED chip 401 and a fourth encapsulation body 402. The fourth LED chip 401 is placed at the bottom of the fourth accommodation groove 64 and is electrically connected to the outside through two pins 54a and 54b. The fourth encapsulation body 402 fills the fourth accommodation groove 64 and covers the fourth LED chip 401. The fourth LED chip 401 is a blue LED that emits blue light with a peak wavelength in the range of 445 - 455nm. In this embodiment, the fourth LED chip 401 selects the same model as the second LED chip 201 and the third LED chip 301, and maintains a peak wavelength difference of 5nm from the first LED chip 101. In other embodiments, other models of blue chips can also be selected, and the present application does not limit this.

[0066] The fourth encapsulation body 402 contains a fourth phosphor 403. The fourth light-emitting unit 400 emits white light. Therefore, the fourth phosphor 403 is composed of a mixture of multiple phosphors, including at least one blue-green phosphor with a peak wavelength in the range of 485 - 515nm, at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580nm, and at least one red-orange phosphor with a peak wavelength in the range of 615 - 655nm. In this embodiment, the blue-green phosphor is (Ba, Sr)Si 2 N 2O 2 : Eu; The yellow-green phosphor can be selected from (Lu, Yb, Tb) 3 (Al, Ga) 5 O 12 : Ce, (Ba, Sr, Ca, Mg)SiO 4 : Eu, Ga-Y 3 Al 5 O 12 : Ce, Y 3 (Al, Ga) 5 O 12 : One or more mixtures of Ce; The red-orange phosphor is CaAlSiN 3 : Eu, (Ca, Sr)AlSiN 3 : Eu, (Ba, Sr, Ca, Mg) 2 Si 5 N 8 : Eu, K 2 SiF 6 : Mn 4+ , K 2 GeF 6 : Mn 4+ , K 2 TiF 6 : Mn 4+ Any one or several combinations of the above. After mixing the above phosphors, the fourth phosphor 403 is formed. After being excited by the fourth LED chip 402, the light emitted by the fourth light-emitting unit 400 is white light.

[0067] The first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 can already form white light by themselves. For the added fourth light-emitting unit 400, we hope it can have some other characteristics. With the increasing requirements for light quality, people are paying more and more attention to lighting and circadian rhythms. Research has shown that different lighting environments are related to melatonin secretion. Therefore, in the fourth light-emitting unit 400, we specifically added a consideration of the MDER index. By compensating the spectrum of the fourth light-emitting unit 400 in specific wavelength bands, especially in the blue and yellow wavelength bands, the spectral continuity of the overall mixed white light is better.

[0068] MDER (Melanopic Daylight Efficiency Ratio) is the ratio of calculating the equivalent melanopic illuminance of the light source to that in the daylight (D65 standard light source) state. It is the ratio of melanopic and photopic illuminance calculated by weighting the relative intensities of each wavelength with a specified formula. The specific formula is as follows:

[0069]

[0070] Wherein:

[0071] EDI_mel(D65): Scotopic illuminance of the equivalent D65 standard light source;

[0072] Ev: Photopic illuminance;

[0073] P(λ): Spectral power distribution of the light source to be measured;

[0074] V(λ): Photopic luminous efficiency function;

[0075] M(λ): Photosensitivity function of melanopsin photoreceptor cells (ipRGC).

[0076] The above calculation formulas are based on the parameter definitions and calculation methods published by CIE S026.

[0077] In one solution, the fourth light-emitting unit 400 can be selected as a white light chip with a relative color temperature of 4000 ± 250K, a color rendering index greater than 90, and an MDER greater than 0.65. Similarly, we control the four-color light-emitting units independently in the way of giving a PWM signal as the control signal, and apply different duty cycles to modulate the luminous power of each light-emitting unit to achieve the mixed light effect. Table 2 lists the relative color temperature CCT, color deviation Duv, and color rendering index CRI obtained by mixing light after modulating the duty cycles of the PWM signals of the four light-emitting units under the condition of adding the fourth light-emitting unit 400.

[0078] Table 2

[0079]

[0080] The relative spectral diagrams of the white light in each column listed in Table 2 are as Figure 5a , Figure 5b , Figure 5c shown. Among them, Figure 5a corresponds to categories For_a1, For_b1, and For_c1, Figure 5b corresponds to categories For_d1, For_e1, and For_f1, Figure 5c corresponds to categories For_g1, For_h1, and For_i1.

[0081] In another solution, the fourth light-emitting unit 400 can be a white light chip with a relative color temperature of 5000±250K, a color rendering index greater than 90, and an MDER greater than 0.75. Similarly, we control the four color light-emitting units independently by using a PWM signal as the control signal, and apply different duty cycles to modulate the light-emitting power of each light-emitting unit to achieve the mixed light effect. Table 3 lists the relative color temperature CCT, color deviation Duv, and color rendering index CRI obtained by mixing light after modulating the duty cycles of the PWM signals of the four light-emitting units under the condition of adding the fourth light-emitting unit 400.

[0082] Table 3

[0083]

[0084] The relative spectral diagrams of the white light in each column listed in Table 3 are as Figure 6a 、 Figure 6b 、 Figure 6c shown. Among them, Figure 6a corresponds to categories For_a2, For_b2, and For_c2, Figure 6b corresponds to categories For_d2, For_e2, and For_f2, Figure 6c corresponds to categories For_g2, For_h2, and For_i2.

[0085] As can be seen from Table 2 and Table 3, after adding the fourth light-emitting unit 400, the color rendering property of the light source module 1 is further improved within the original white light color temperature range of 1800 - 20000K. In these two selections of the fourth light-emitting unit 400, when the color temperature is between 2100 - 20000K, the color rendering index CRI can reach above 95.

[0086] In Figure 1 embodiments, a packaging structure of the light source module 1 is shown, in which the four light-emitting units are packaged together. In other preferred embodiments, each light-emitting unit can also be independently packaged and finally arranged on the same substrate to form the light source module 1. In addition, they can also be packaged in pairs, or the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 are packaged together, while the fourth light-emitting unit 400 is independently packaged. The present application does not make any limitations in this regard. There are many packaging structures for independent packaging. Taking the fourth light-emitting unit 400 as an example, some other preferred packaging forms will be described. In Figure 7a 、 7b embodiments, the packaging structure also adopts a bracket structure as in Figure 1 embodiments. A receiving groove is formed on the bracket. Only a single light-emitting unit - the fourth light-emitting unit 400 in the light source module 1 is shown in the figure. Therefore, this receiving groove is the fourth receiving groove 64. Figure 7aIn the embodiment, after the fourth LED chip 401 is placed, electrical connection is achieved with the outside through pins 54a and 54b. First, the fourth phosphor 403 is tiled on the surface of the fourth LED chip 401 by spraying or coating, and then the fourth accommodating groove 64 is filled with the fourth encapsulation body 402. And in Figure 7b , first, the fourth accommodating groove 64 already containing the fourth LED chip 401 is filled with the fourth encapsulation body 402, and then the fourth phosphor 403 is tiled on the upper surface of the fourth encapsulation body 402 by spraying or coating. As previously mentioned, we already know that the fourth phosphor 403 of the fourth light-emitting unit 400 includes a variety of different phosphors. Figure 7c The encapsulation structure and Figure 7b are different in that different types of phosphors are coated in layers, thus forming the double-layer structure shown in the figure. Figure 7d For the ceramic high-power encapsulation method, a ceramic or metal material is used as the substrate 94. The fourth LED chip 401 is disposed on the substrate 94. The fourth phosphor 403 is used to form a light conversion layer on the surface of the fourth LED chip 401 by spraying, fluorescence film laminating or fluorescent ceramic sheet mounting, and then the fourth encapsulation body 402 is filled by die casting to cover the fourth phosphor 403 and the fourth LED chip 401. Figure 7e For CSP encapsulation, which is suitable for high-power chips, a ceramic or metal material is used as the substrate 94. After the fourth phosphor 403 and the fourth encapsulation body 402 are mixed, a light conversion layer on the surface of the fourth LED chip 401 is formed by fluorescence film laminating to complete the encapsulation. Figure 7f The structure and Figure 7e are similar. Similarly, a ceramic or metal material is used as the substrate 94. The fourth phosphor 403 is used to form a light conversion layer on the surface of the fourth LED chip 401 by spraying or fluorescence film laminating, and the fourth encapsulation body 402 is disposed on the outside to complete the encapsulation. The above methods can all achieve the invention purpose of the present invention, and the present invention does not make any limitation thereto.

[0087] Another preferred embodiment of the light source module of the present invention is as Figure 10 shown, including a light source board 6 and four light-emitting units disposed on the light source board, a first light-emitting unit 100, a second light-emitting unit 200, a third light-emitting unit 300, a fourth light-emitting unit 400, and four lenses corresponding to these light-emitting units one by one, a first lens 501, a second lens 502, a third lens 503, and a fourth lens 504. The first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 respectively cover the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400. The spectra and light colors of the four light-emitting units are the same as those of the foregoing embodiment, and will not be elaborated here.

[0088] As we know, in the same medium, the refractive indices for different frequency colored lights are different. In this embodiment, the lens is made of PC material. The refractive index of light with a wavelength of 457.7 nm in PC material is 1.60567, while the refractive index of light with a wavelength of 629.9 nm is 1.58071, indicating that the longer the wavelength, the smaller the refractive index. Therefore, it is necessary to design corresponding optical lenses for each spectrum respectively. Of course, the spectrum of white light is the full spectrum from 380 nm to 780 nm. Therefore, for white light, we calculate according to the wavelength of 555 nm.

[0089] Referring to Figure 4, according to the refractive index theorem:

[0090] n1*sinθ1 = n2*sinθ2 and n2*sinθ3 = n3*sinθ4;

[0091] where n1 = n3 = 1, and n2 is the refractive index of different spectra.

[0092] θ1 is the incident angle formed by the light ray emitted from the light source on the incident surface 5051, and θ2 is the exit angle formed by the light ray exiting from the incident surface 5051 on the incident surface 5051. The value of θ1 is determined according to the included angle between the incident light ray of the light source and the normal line of the incident surface. The curved surface shape of the incident surface can be any free curve or a quadratic curve (such as a parabola, an ellipse, or a circle, etc.) obtained by rotation. By differentiating according to the shape of the incident surface, its tangent equation can be obtained, and then its normal equation can be obtained. According to the incident light ray and the normal line, the specific value of θ1 can be obtained. Then, according to n1*sinθ1 = n2*sinθ2, θ2 = arcsin(n2*sinθ2 / sinθ1) can be obtained. Among them, the light ray exiting from the incident surface 5051 is also the incident light ray of the exit surface 5052. According to the geometric relationship, θ3 = f(θ2) can be obtained, thereby obtaining θ3. The exit light ray θ4 is the desired exit angle, which is set according to our needs. Given n2, θ3, n3, and θ4, the normal slope of the exit surface 5052 can be obtained according to the vector form of the refraction law. According to the perpendicular relationship between its normal line and the tangent line, the slope of the tangent line can be obtained, thereby obtaining the curve of the exit surface.

[0093] In this embodiment, the incident surfaces 5051 of each lens are the same, and it is required that the final exit angles are the same. According to the above calculations, the smaller the wavelength, the larger the refractive index, and the smaller the size of the lens exit surface. Therefore, the lens sizes corresponding to different wavelengths are different. For example Figure 12The diameter d1 of the first lens 501 shown < the diameter d2 of the second lens 502 < the diameter d4 of the fourth lens 504 < the diameter d3 of the third lens 503. Therefore, the size of the third lens 503 covering red light is larger than that of the first lens 503 covering blue light. Since white light is selected to be calculated at a wavelength of 555, the size of the fourth lens 504 covering white light is between the third lens 503 and the first lens 501. Specifically, the diameter d1 of the first lens 501 is 0.90 to 0.98 times the diameter d4 of the fourth lens 504; the diameter d2 of the second lens 502 is 0.95 to 1.00 times the diameter d4 of the fourth lens 504; the diameter d3 of the third lens 503 is 1.00 to 1.10 times the diameter d4 of the fourth lens 504.

[0094] In this embodiment, the first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 are integrated into a light distribution module 5. The fourth lens 504 is arranged in the middle, and the other three lenses are arranged around the fourth lens 504. The centers of the first lens 501, the second lens 502, and the third lens 503 are evenly distributed, that is, equally angularly distributed on the circumferential surface coaxial with the fourth lens.

[0095] Another preferred embodiment of the present invention is as Figure 8 shown in the lighting system, including the light source module 1 and the drive circuit 2 in the above embodiment.

[0096] The drive circuit 2 includes a power conversion module 21, a control module 22, and an LED drive module 23. The power conversion module 21 is connected to an external power supply and converts the external power supply into a DC power supply required by the light source module 1. The control module 22 includes a communication module that receives the dimming / color adjustment commands transmitted from the outside and generates a control signal based on this. The communication module can be a wired or wireless communication module, and the present invention does not limit this. The input of the LED drive module 23 is the DC power supply output by the power conversion module 21 and the control signal transmitted from the control module 22. According to the control signal, the DC power supply is adjusted, and the adjusted drive current / voltage required by each of the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400 in the light source module 1 is output respectively. Therefore, the LED drive module 23 needs to be electrically connected to the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400 respectively. When there are multiple light source modules 1 in the lighting system, as Figure 8 shown, the first light-emitting units 100, the second light-emitting units 200, the third light-emitting units 300, and the fourth light-emitting units 400 in each light source module 1 are respectively connected in series and then electrically connected to the LED drive module 23.

[0097] As described above, the color temperature adjustable range of the light source module 1 of the embodiment is from 1800 - 20000K. Therefore, the control module 22 includes a storage module that stores preset control parameter values, which are the control parameter values corresponding to the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400 when the light source module 1 generates different color temperatures. The control parameter values can be voltage values, current values, or PWM signals. When a light-emitting unit does not participate in color mixing, the control parameter value of that light-emitting unit is zero. When a color temperature change requirement is received from the outside, the control module 22 receives the command, reads the relevant values in the storage module, forms a control signal, and sends it to the LED driving module 23 to adjust the current / voltage output to the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400, so that the light source module 1 emits light of the target color or white light of the corresponding color temperature. In this embodiment, the preset control parameters are the duty ratios of the PWM signals of each light-emitting unit in Tables 1, 2, and 3. Since the light source module 1 selects light-emitting units of specific colors and is controlled according to the preset parameters, the white light obtained has a wider color temperature coverage range compared to the white light obtained by color mixing in the prior art, which can range from 1800K to 20000K, and the color deviation Duv from the blackbody radiation line is less than 0.003. At the same time, the light source module has good color rendering properties. The color rendering index CRI is greater than 90 in the color temperature range of 1800 - 20000K, and the color rendering index CRI is greater than 95 in the color temperature range of 2100K - 20000K, which is superior to the light quality of existing multi-in-one light sources such as RGB and RGBW, and is more suitable for the general indoor lighting field. In addition, by controlling multiple light-emitting units, colored light can be compatible. Various colored ambient lights can be formed by adjusting the light output ratios of the first light-emitting unit 100, the second light-emitting unit 200, and the third light-emitting unit 300 to realize a colored light illumination system.

[0098] The above light source module and lighting system can be applied to various types of lamps, Figure 9Fig. 0 shows a lighting fixture D1 according to a preferred embodiment of the present application. The lighting fixture D1 is a lamp panel and includes the lighting system as described above. In other preferred embodiments, it may also be a chandelier, a ceiling lamp, etc. Alternatively, the light source module 1 can also be applied as a common white light chip to various lighting fixtures such as table lamps, downlights, and spotlights. The lighting fixture D1 includes a chassis 86, a face frame 88 provided with a diffuser plate 89, a plurality of light source modules 1 disposed on a light source board 85, and a power supply box 87. The aforementioned driving circuit 2 is disposed in the power supply box 87. In the lighting fixture, wiring is respectively performed for the first light emitting unit 100, the second light emitting unit 200, the third light emitting unit 300, and the fourth light emitting unit 400 in the light source module 1. The same type of light emitting units in each light source module 1 are connected in series and then connected to the driving circuit 2 in the power supply box 87 to form the aforementioned lighting system. The lighting fixture D1 may also include a controller, a heat dissipation device, a light distribution component, etc. according to the functions and requirements of the specific lighting fixture. The controller can be used to adjust the light color, light intensity, etc. of the illumination light emitted by the light source module L1. In addition to the diffuser plate in the embodiment, the light distribution component can also be a lampshade, a lens, a diffusion element, an optical waveguide, etc. The present invention does not limit this.

[0099] The foregoing description of the preferred embodiments of the present invention is for purposes of illustration and description and is not intended to exhaust or limit the invention to the specific forms disclosed. Obviously, many modifications and variations are possible and would be apparent to those skilled in the art. These modifications and variations should be included within the scope of the invention as defined by the appended claims.

Claims

1. A light source module, characterized in that, it includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are electrically independent of each other; The first light-emitting unit includes a first LED chip, a first encapsulant covering the first LED chip, and a first phosphor. The wavelength of the main emission peak of the light emitted by the first light-emitting unit is between 445 - 460 nm, the wavelength of the secondary emission peak is between 480 - 500 nm, and the peak energy of the secondary emission peak is 10 - 50% of the peak energy of the main emission peak. Its light color is blue-green light located within the quadrilateral region enclosed by four points A1(0.18, 0.22), A2(0.22, 0.28), A3(0.24, 0.21), and A4(0.19, 0.18) on the 1931 CIE chromaticity diagram; The second light-emitting unit includes a second LED chip, a second encapsulant covering the second LED chip, and a second phosphor. The wavelength of the main emission peak of the light emitted by the second light-emitting unit is between 530 - 580 nm, and the spectral half-width is 90 - 130 nm. Its light color is yellow-green light located within the quadrilateral region enclosed by four points B1(0.38, 0.51), B2(0.40, 0.58), B3(0.45, 0.53), and B4(0.43, 0.46) on the 1931 CIE chromaticity diagram; The third light-emitting unit includes a third LED chip, a third encapsulant covering the third LED chip, and a third phosphor. The wavelength of the main emission peak of the light emitted by the third light-emitting unit is between 620 - 655 nm, the wavelength of the secondary emission peak is between 550 - 580 nm, and the peak energy of the secondary emission peak is 0 - 40% of the peak energy of the main emission peak. Its light color is orange-red light located within the quadrilateral region enclosed by four points C1(0.55, 0.40), C2(0.56, 0.44), C3(0.68, 0.32), and C4(0.65, 0.31) on the 1931 CIE chromaticity diagram.

2. The light source module according to claim 1, characterized in that, the blue light content of the second light-emitting unit is less than 30%, and the blue light content of the third light-emitting unit is less than 10%.

3. The light source module according to claim 1, characterized in that, the first LED chip, the second LED chip, and the third LED chip include at least two types of LED chips, one with a peak wavelength of 450 - 465 nm and the other with a peak wavelength of 445 - 455 nm, and the difference between the peak wavelengths of the two types of LED chips is greater than or equal to 5 nm.

4. The light source module according to claim 1, characterized in that, The first phosphor includes at least one blue-green phosphor with a peak wavelength in the range of 485 - 515 nm and at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm. The blue-green phosphor is (Ba,Sr)Si 2 N 2 O 2 :Eu; The yellow-green phosphor is (Lu,Yb,Tb) 3 (Al,Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al,Ga) 5 O 12 :Ce.

5. The light source module according to claim 1, characterized in that, The second phosphor includes at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm, and the yellow-green phosphor is (Lu, Yb, Tb) 3 (Al, Ga) 5 O 12 :Ce, Ga - Y 3 Al 5 O 12 :Ce, Y 3 (Al, Ga) 5 O 12 :Ce.

6. The light source module according to claim 1, characterized in that, The third phosphor includes at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm and at least one red phosphor with a peak wavelength in the range of 620 - 655 nm. The yellow-green phosphor is (Lu, Yb, Tb) 3 (Al, Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al, Ga) 5 O 12 :Ce; The red phosphor is CaAlSiN 3 :Eu, (Ca, Sr)AlSiN 3 :Eu, (Ba, Sr, Ca, Mg) 2 Si 5 N 8 :Eu, K 2 SiF 6 :Mn 4+ 、K 2 GeF 6 :Mn 4+ 、K 2 TiF 6 :Mn 4+ 。 7. The light source module according to claim 1, characterized in that, The white light formed by the mixed light emission of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit has an adjustable color temperature in the range of 1800 - 20000K, and the color deviation Duv from the blackbody radiation line is less than 0.

003.

8. The light source module according to claim 7, wherein, the white light formed by the mixed light emission of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit has a color rendering index CRI greater than 90 within the color temperature range of 1800 - 20000K.

9. The light source module according to claim 1, wherein, the light source module further includes a fourth light-emitting unit, the fourth light-emitting unit includes a fourth LED chip, a fourth encapsulation body covering the fourth LED chip, and a fourth phosphor, the fourth light-emitting unit emits white light, its color temperature is 4000K ± 250K, the color rendering index is greater than 90 and MDER is greater than 0.65; or the color temperature is 5000 ± 250K, the color rendering index is greater than 90 and MDER is greater than 0.

75.

10. The light source module according to claim 9, wherein, The fourth phosphor includes at least one blue-green phosphor with a peak wavelength in the range of 485 - 515 nm, at least one yellow-green phosphor with a peak wavelength in the range of 520 - 580 nm, and at least one red-orange phosphor with a peak wavelength in the range of 615 - 655 nm. The blue-green phosphor is (Ba,Sr)Si 2 N 2 O 2 :Eu; The yellow-green phosphor is (Lu,Yb,Tb) 3 (Al,Ga) 5 O 12 :Ce, Ga-Y 3 Al 5 O 12 :Ce, Y 3 (Al,Ga) 5 O 12 :Ce, (Ba,Sr,Ca,Mg)SiO 4 :Eu; The red-orange phosphor is CaAlSiN 3 :Eu, (Ca,Sr)AlSiN 3 :Eu, (Ba,Sr,Ca,Mg) 2 Si 5 N 8 :Eu, K 2 SiF 6 :Mn 4+ 、K 2 GeF 6 :Mn 4+ 、K 2 TiF 6 :Mn 4+ 。 11. The light source module according to claim 9, wherein, the light source module is a packaged chip, which includes a main body part, and a first accommodation groove, a second accommodation groove, a third accommodation groove, and a fourth accommodation groove are provided on the main body part, the first LED chip and the first phosphor, the second LED chip and the second phosphor, the third LED chip and the third phosphor, the fourth LED chip and the fourth phosphor are respectively arranged in the first accommodation groove, the second accommodation groove, the third accommodation groove, and the fourth accommodation groove, and the first encapsulation body, the second encapsulation body, the third encapsulation body, and the fourth encapsulation body respectively fill the first accommodation groove, the second accommodation groove, the third accommodation groove, and the fourth accommodation groove and cover the first LED chip, the second LED chip, the third LED chip, and the fourth LED chip.

12. The light source module according to claim 9, wherein, the light source module includes a light source board, the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit are arranged on the light source board, a first lens, a second lens, a third lens, and a fourth lens are distributed to cover the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit, the first lens, the second lens, the third lens, and the fourth lens are convolute lenses, and the first lens, the second lens, and the third lens are evenly distributed around the fourth lens along the circumference.

13. The light source module according to claim 9, wherein, when the color temperature of the white light emitted by the light source module is in the range of 2100 - 20000K, the color rendering index CRI is greater than 95.

14. An illumination system, wherein, it includes: a light source and a driving circuit, the light source includes at least one light source module according to any one of claims 1 to 13; The driving circuit is electrically connected to and supplies power to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit respectively, and the driving circuit controls the current / voltage supplied to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit respectively.

15. The lighting system according to claim 14, wherein, the driving circuit includes: a power conversion module that converts an external power supply into a DC power supply required by the light source module; a control module that generates a control signal; an LED driving module that receives the DC power output by the power conversion module and the control signal transmitted from the control module, adjusts the DC power according to the control signal, and the LED driving module is electrically connected to and outputs the adjusted driving current / voltage required by each of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit respectively.

16. The lighting system according to claim 15, wherein, the control signal is a PWM signal.

17. The lighting system according to claim 15, wherein, the control module includes a communication module that receives a dimming / color adjustment command transmitted from the outside and generates the control signal based on this.

18. The lighting system according to claim 15, wherein, the control module includes a storage module that stores preset control parameter values, and the control parameter values are the control parameter values corresponding to the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit when the light source module generates different color temperatures. The light source module is controlled according to the control parameter values, and the color temperature of the white light emitted by the light source module is adjustable within the range of 1800 - 20000K, and the color deviation Duv from the blackbody radiation line is less than 0.

003.

19. The lighting system according to claim 18, wherein, when the light source module is controlled according to the control parameter values, the color rendering index CRI of the white light formed by the light emission mixing of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is greater than 90 within the color temperature range of 1800 - 20000K.

20. The lighting system according to claim 18, wherein, the light source module further includes a fourth light-emitting unit, and the fourth light-emitting unit includes a fourth LED chip, a fourth encapsulation body covering the fourth LED chip, and a fourth phosphor. The fourth light-emitting unit emits white light, and its color temperature is 4000K ± 250K, the color rendering index is greater than 90 and the MDER is greater than 0.65; or the color temperature is 5000 ± 250K, the color rendering index is greater than 90 and the MDER is greater than 0.

75. The driving circuit is electrically connected to and supplies power to the fourth light-emitting unit, and controls the current / voltage of the fourth light-emitting unit independently of other light-emitting units.

21. The lighting system according to claim 20, wherein, when the light source module is controlled according to the control parameter values, when the color temperature of the obtained white light is within the range of 2100 - 20000K, the color rendering index CRI is greater than 95.

22. The lighting system according to claim 15, characterized in that, the light source includes two or more of the light source modules, and the first light emitting unit, the second light emitting unit, and the third light emitting unit in each light source module are respectively connected in series and then electrically connected to the LED driving module.

23. A lighting fixture, characterized in that, it includes the light source module according to any one of claims 1 to 13, or includes the lighting system according to any one of claims 14 to 22.

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