LED light source for plant illumination

Abstract

According to the LED light source for plant illumination, the plant illumination scheme has remarkable advantages, and the requirements of plant photosynthesis core wave bands (400-700 nm) and physiological regulation wave bands are met through coverage of four wave bands from ultraviolet light to far-red light. A series circuit is adopted, multi-wavelength wafer series-parallel spectrum fluctuation is eliminated, a blue light chip excites a fluorescent glue layer, 500-700 nm spectrums are complemented, and the chlorophyll a / b absorption efficiency is improved by 22%-35%. According to the specific configuration, the number of the purple light LED wafer, the blue light LED wafer and the far-red light LED wafer is 3: 12: 2, and the peak wavelengths of the purple light LED wafer, the blue light LED wafer and the far-red light LED wafer are 395-405 nm, 445-455 nm and 725-735 According to the proportion, three wave band photon fluxes are optimized to a plant light receptor response threshold value, purple light enables the anthocyanin accumulation amount to be increased by 40%, blue light enables the net photosynthetic rate to be increased by 28%, and far-red light enables the quantum yield to be increased by 19%. The three synergistically accelerate accumulation of organic matters and shorten the plant coloring time.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED light sources, and in particular relates to an LED light source for plant lighting. Background Art

[0002] Although existing plant lighting sources (such as the patented technology with Chinese Authorization Announcement No. CN212461683U) extend the continuity of the blue light spectrum by stacking multiple blue light band LED chips (410-435nm, 440-460nm, 465-485nm) and using fluorescent glue to excite red light, their spectrum is still concentrated in the blue to red light band (400-680nm), missing the key ultraviolet and far-red light bands. This design results in insufficient chlorophyll a / b absorption efficiency, which cannot effectively promote anthocyanin synthesis to inhibit plant growth. At the same time, due to the lack of 725-735nm far-red light to regulate photomorphogenesis, the energy efficiency of photosynthesis is limited, ultimately affecting the accumulation of organic matter and the increase of crop yields. There is an urgent need to improve the spectral integrity and physiological regulation efficiency. Utility Model Content

[0003] (1) Purpose of the utility model

[0004] In order to overcome the above shortcomings, the purpose of the present invention is to provide an LED light source for plant lighting, so as to solve the technical problems that the lack of key ultraviolet and far-red light bands leads to insufficient chlorophyll a / b absorption efficiency, cannot effectively promote anthocyanin synthesis and inhibit plant growth, lack of far-red light to regulate photomorphogenesis, limited photosynthesis energy efficiency, and affect the accumulation of organic matter and the increase of crop yield.

[0005] (2) Technical solution

[0006] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0007] An LED light source for plant lighting, comprising: a bracket, and a plurality of LED chips disposed on the bracket and connected in series, each of the LED chips being coated with fluorescent glue, wherein the plurality of LED chips include a violet LED chip, a blue LED chip, and a far-red LED chip, wherein the ratio of the violet LED chip, the blue LED chip, and the far-red LED chip is 3:12:2;

[0008] By covering four wavelength bands from ultraviolet to far-red, it simultaneously meets the core wavelength band of plant photosynthesis (400-700nm) and the physiological regulation band (ultraviolet inhibits excessive growth / far-red promotes light morphology); the series circuit driving current has high consistency, eliminating spectral fluctuations when multi-wavelength chips are mixed; the blue light chip excites the fluorescent glue layer, supplementing the 500-700nm spectrum missing in traditional solutions, and ultimately improving the chlorophyll a / b absorption efficiency by 22%-35%; specifically, the number of purple LED chips is multiple and the peak wavelength range is 395-405nm, the number of blue LED chips is multiple and the peak wavelength range is 4 The 45-455nm and far-red LED chips are multiple and have a peak wavelength range of 725-735nm. The three types of LED chips are configured in a ratio of 3:12:2, which can optimize the photon flux of the three bands to the response threshold of plant photoreceptors - purple light activates the expression of CRY / PHY ultraviolet receptor genes, and the accumulation of anthocyanins increases by 40%; blue light drives the PSI / PSII photosynthetic reaction center, and the net photosynthetic rate increases by 28%; far-red light (735nm) prolongs the charge separation state of photosystem II and increases the quantum yield by 19%; the three can work together to accelerate the accumulation of organic matter and shorten the coloring time of plants.

[0009] In some embodiments, the purple LED chips are connected in series to form a first group; the blue LED chips are connected in series to form a second group; the far-red LED chips are connected in series to form a third group; and the first group, the second group and the third group are connected in series.

[0010] In some embodiments, the optical power ratio of the violet LED chip, the blue LED chip, and the far-red LED chip is configured as 18.8%:73%:8.2%, so that the spectrum covers the ultraviolet to far-red range;

[0011] This quantitative ratio and wavelength combination optimizes the proportion of light power in the three bands to 18.8%: 73%: 8.2%; the violet light band stimulates anthocyanin synthesis to achieve the coloring effect, the blue light band dominates chlorophyll absorption, and the far-red light band expands the photosynthesis efficiency window and regulates light morphology construction. The three synergistically enhance organic matter accumulation and biomass output in a specific ratio.

[0012] In some embodiments, the bracket is a heat dissipation enhanced copper bracket, comprising an upper end and a lower end; the upper end and the lower end are respectively provided with a positive electrode pin and a negative electrode pin;

[0013] The high thermal conductivity of the copper bracket, combined with the double-ended pin layout, conducts heat from the chip along the pin axis to the external heat sink, reducing the temperature rise in the bowl area by more than 40%. Low-temperature operation ensures the stability of the quantum efficiency of the ultraviolet light chip (395-405nm), avoids spectral drift, and at the same time extends the life of the far-infrared light chip and maintains its peak wavelength accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the LED light source for plant lighting according to the present invention from a first perspective;

[0015] Figure 2 This is a schematic structural diagram of the LED light source for plant lighting according to the present invention from a second viewing angle;

[0016] Figure 3 This is a relative spectral power distribution curve spectrum diagram obtained by testing the LED light source for plant lighting of the present invention.

[0017] Reference numerals:

[0018] 1. Bracket; 101. Positive pin; 102. Negative pin; 2. Far-red LED chip; 3. Purple LED chip; 4. Blue LED chip. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0020] The present invention provides an LED light source for plant lighting, comprising: a bracket 1, a plurality of LED chips connected in series, and a fluorescent adhesive layer covering the chips. It is worth noting that the LED chips include three types of chips: violet light, blue light, and far-infrared light. Specifically, all chips are fixed in the bowl-cup structure of the bracket 1, and pins are provided on the chips. The pins are connected in sequence by gold wire bonding to form a series circuit, and then connected to the positive and negative poles of the bracket 1 for power supply. Specifically, the fluorescent adhesive is coated on the surface of the chips, and the three types of chips cooperate to output a continuous spectrum of ultraviolet to far-infrared light.

[0021] Specifically, the fluorescent glue is made by mixing silica gel and fluorescent powder and is coated on the surface of the LED chip.

[0022] Furthermore, the peak wavelength of the violet LED chip 3 is set at 395-405nm, with a total of three chips; the peak wavelength of the blue LED chip 4 is set at 445-455nm, with a total of 12 chips; and the peak wavelength of the far-red LED chip 2 is set at 725-735nm, with a total of two chips. Specifically, the ratio of the three types of chips is strictly configured to be 3:12:2. This ensures a wavelength tolerance of within ±2nm, ensuring spectral accuracy.

[0023] On this basis, the chips are connected in groups in series: 12 blue chips are connected in series as the first group, 3 purple chips are connected in series as the second group, and 2 far-infrared chips are connected in series as the third group. Preferably, the gold wire bonding uses a gold wire with a diameter of 25μm and a bonding tension greater than 5gf.

[0024] Specifically, a chip ratio of 3:12:2 stabilizes the optical power ratio of violet, blue, and far-infrared light at 18.8%:73%:8.2%. This ratio is achieved by adjusting the chip size (preferably 45 mil for violet, 40 mil for blue, and 55 mil for far-infrared).

[0025] The spectrum of the LED light source of this application is analyzed to obtain the relative spectral power distribution curve ( Figure 3 ),from Figure 3 It can be seen that:

[0026] Four-band continuous coverage:

[0027] The figure clearly shows the four characteristic peaks of ultraviolet (395-405nm), blue light (445-455nm), red light (600-680nm), and far-red light (725-735nm), covering the core band of plant photosynthesis (400-700nm) and the physiological regulation band (ultraviolet / far-red light), which contrasts with the defect of traditional solutions in background technology that lack ultraviolet / far-red light.

[0028] Continuity of the red light band (500-700nm): Produced by the blue light chip exciting the fluorescent gel layer, it fills the gap in the red light band in traditional solutions and directly improves the absorption efficiency of chlorophyll a / b (22%-35% increase).

[0029] Peak wavelength and function verification:

[0030] Purple light peak (400nm): activates CRY / PHY ultraviolet receptor genes, promotes anthocyanin synthesis (accumulation +40%), and inhibits plant growth.

[0031] Blue light peak (450nm): It dominates the driving force of the PSI / PSII photosynthetic reaction center, with the highest peak intensity (accounting for 73%), supporting a 28% increase in the net photosynthetic rate.

[0032] Far-red light peak (730nm): precisely matches the requirements of light morphology construction (725-735nm), prolongs the charge separation state of photosystem II, and increases quantum yield by 19%.

[0033] Spectral ratio collaborative optimization:

[0034] The power ratios of purple light, blue light, and far-infrared light are close to 18.8%, 73%, and 8.2% (blue light dominates, far-infrared light is the lowest but critical), which is in line with the design logic of a chip quantity ratio of 3:12:2.

[0035] There is no overlapping interference among the bands, and the ultraviolet and far-infrared edge bands are clear and independent, ensuring physiological regulatory functions (such as ultraviolet inhibiting excessive growth and far-infrared regulating light morphology).

[0036] Visualization of technical advantages:

[0037] Efficient absorption matching: The chlorophyll a / b absorption peaks (430-450nm, 640-660nm) highly overlap with the blue and red light bands, explaining the mechanism of accelerated organic matter accumulation.

[0038] Preferably, the bracket 1 is made of 5054 copper (thermal conductivity ≥ 380W / m·K) with a thickness of 1.2mm. In particular, a positive pin 101 is provided at the upper end of the bracket 1, and a negative pin 102 is provided at the lower end, forming a bipolar axial heat dissipation path. At the same time, it is convenient for the design of the product circuit. Preferably, the pin diameter is 1.5mm copper alloy, and the extension length is 8mm to connect to the external radiator. It is worth noting that the bowl cup depth is 0.6mm, and the inner wall is silver-plated with a reflective layer to improve the reflectivity. In alternative solutions, the bracket 1 can be made of nickel-plated copper or aluminum silicon carbide composite material, but the copper bracket 1 is the most preferred.

[0039] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. An LED light source for plant lighting, characterized in that: include: A bracket (1), a plurality of LED chips arranged on the bracket (1) and connected in series, each of the LED chips being coated with fluorescent glue, wherein the plurality of LED chips include a violet LED chip (3), a blue LED chip (4) and a far-red LED chip (2), and the ratio of the number of the violet LED chip (3), the blue LED chip (4) and the far-red LED chip (2) is 3:12:

2.

2. The LED light source according to claim 1, characterized in that The purple LED chips (3) are connected in series to form a first group; the blue LED chips (4) are connected in series to form a second group; the far-red LED chips (2) are connected in series to form a third group; and the first group, the second group and the third group are connected in series to form a third group.

3. The LED light source according to claim 1 or 2, characterized in that: The optical power ratio of the violet LED chip (3), the blue LED chip (4) and the far-red LED chip (2) is configured to be 18.8%:73%:8.2%, so that the spectrum covers the ultraviolet to far-red light band.

4. The LED light source according to claim 1, wherein The bracket (1) is a heat dissipation enhanced copper bracket (1), comprising an upper end and a lower end; the upper end and the lower end are respectively provided with a positive electrode pin (101) and a negative electrode pin (102).

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