CN105465677A - Plant lighting source and method thereof for illuminating plants - Google Patents

Abstract

The invention discloses a plant lighting source and a method thereof for illuminating plants. Only two types of different light source lamps are needed so as to meet the illumination demands of plant growth in the whole period. The two types of different light source lamps include a purple light, blue light and blue-green light LED (purple light lamp) and a purple light, blue light and blue-green light LED (pink light lamp), wherein the luminous power ratio between the light emitted by the former LED and the light emitted by red fluorescent powder is 2: 1, and the luminous power ratio between the light emitted by the later LED and the light emitted by the red fluorescent powder is 1: 6. As the types and the number of LED devices are reduced, the cost of the lighting source can be greatly reduced. Besides, the design of LED driving is simplified and the cost for LED driving is reduced. As efficient and proper purple light and blue light wave-length chips and proper fluorescent powder are selected, the photoelectric converting efficiency of a system is high, and the effect on helping plant growth is good.

Description

A plant lighting source and its method for illuminating plants

technical field

The present application relates to the technical field of LED lighting, in particular to a plant lighting source and a method for illuminating plants.

Background technique

Light is the energy source of all life on earth and one of the most important factors for the survival of all living things in the world. The origin and evolution of life cannot be separated from light, and the structure and function of living things are also strongly affected by light. The growth of green plants needs sunlight, mainly because they need to carry out photosynthesis to provide the nutrients they need for their own growth. The results of plant physiology research show that 90% of the dry matter weight of crops comes from photosynthesis, which reflects that the impact of light on crop yield is very important. The spectrum of sunlight is continuous and contains a huge spectral width, while the chlorophyll of green plants only needs to absorb a small part of it, and different light intensities and different wavelengths of light radiation have different effects on plant growth and composition. According to the absorption spectrum of plant chlorophyll measured by botanists, the absorption of chlorophyll on sunlight is mainly concentrated around the red light of about 660nm of visible light, the blue light of about 460nm and the purple light of about 400nm. Inhibit the production of lateral roots and increase the sugar content of crops, increasing blue light will inhibit the elongation of petioles and increase the protein content of crops, green light has the characteristics of low photosynthesis and weak formation, etc. The growth of crops is not only affected by environmental factors such as temperature and humidity, but also by solar radiation. In order to promote the photosynthesis of plants, artificially simulate the best growth light environment of plants to supplement the light irradiation of plants, provide the light of the absorption spectrum required by plant chlorophyll, improve the light conditions of crops, so that plants can grow in the evening or on cloudy days. Very good photosynthesis, making it in the best growth state, shortening the maturity, is of great significance to the development of high-tech agriculture.

The light source of ordinary LED plant lighting fixtures is to select and configure LED chips with corresponding bands according to the needs of plant growth for spectral bands. Different plants require different light wavelengths for their growth, so it is necessary to configure the required LED chip "package" for the specified plant. This method requires many types of LED chips, and even some specific wavelength LED chips need to be based on Different wavelength needs to be customized. According to this method of adjusting the spectral power distribution of LED lamps by adjusting the types of LED chips and their mutual ratio, it will inevitably lead to an increase in the production cost of the lamps and great inconvenience in the application process.

Contents of the invention

The object of the present invention is to provide a plant lighting source and a method for illuminating plants, so as to overcome the deficiencies in the prior art.

To achieve the above object, the present invention provides the following technical solutions:

The embodiment of the present application discloses a plant lighting source, including:

The first light source, the first light source includes a first light-emitting chip group and red phosphor packaged on the outer surface of the first light-emitting chip group, the first light-emitting chip group consists of a purple light chip, a blue light chip and a blue light chip The green light chips are connected in series. In the first light source, the light power ratio of the first light-emitting chipset and the red phosphor is (1.6~2.4):1;

The second light source, the second light source includes a second light-emitting chip set and red phosphor packaged on the outer surface of the second light-emitting chip set, the second light-emitting chip set consists of a purple light chip, a blue light chip and a blue light chip The green light chips are connected in series, and in the second light source, the light power ratio of the second light-emitting chip group to the red phosphor is 1: (4.8~7.2).

Preferably, in the above light source for plant lighting, among the first light source and the second light source, the emission wavelength after excitation of the purple light chip is 423~443nm, and the emission wavelength after excitation of the blue light chip is 455~465nm, The emission wavelength of the blue-green light chip after excitation is 480-500 nm, and the emission wavelength of the red phosphor powder after excitation is 600-780 nm.

Preferably, in the above plant lighting source, the emission wavelength of the purple light chip after excitation is 440nm, the emission wavelength of the blue light chip after excitation is 465nm, and the emission wavelength of the blue-green light chip after excitation is 485nm.

Preferably, in the above plant lighting source, the light power ratio of the first light-emitting chipset to the red phosphor is 2:1, and the light power ratio of the second light-emitting chip set to the red phosphor is 1:6. .

Correspondingly, the embodiment of the present application also discloses a method for irradiating plants with a plant lighting source. According to the light absorption spectrum required by chlorophyll in different growth stages of plants, the light power ratio between the first light source and the second light source is adjusted to output The corresponding spectral bands are combined to irradiate the plants.

Preferably, in the above-mentioned method for illuminating plants with a plant lighting source, the light power ratio of the first light source and the second light source is 2:1 during the germination stage of the plant and before flowering.

Preferably, in the above-mentioned method for irradiating plants with a plant lighting source, in the germination stage of plants, the combined irradiation time of the first light source and the second light source in every 24 hours is 12 to 18 hours, before the combined irradiation starts The second light source is irradiated alone for 15 to 30 minutes to simulate the sunrise scene in the morning in nature. After the combined irradiation is completed, the second light source is irradiated alone for 15 to 30 minutes to simulate the sunset in the evening. The rest of the time is rest at night.

Preferably, in the above-mentioned method for irradiating plants with a plant lighting source, before the plants germinate to flower, the combined irradiation time of the first light source and the second light source in every 24 hours is 12 to 18 hours. Before the start, the second light source is irradiated alone for 15 to 30 minutes to simulate the sunrise in the morning in nature. After the combined irradiation is completed, the second light source is irradiated alone for 15 to 30 minutes to simulate the sunset in the evening, and the rest of the time is at night rest.

Preferably, in the above method of illuminating plants with a plant lighting source, the light power ratio of the first light source and the second light source is 1:2 during the plant flowering stage.

Preferably, in the above-mentioned method for irradiating plants with a plant lighting source, in the flowering stage of the plants, the combined irradiation time of the first light source and the second light source in every 24 hours is 12 to 18 hours, before the combined irradiation starts The second light source is irradiated alone for 20 to 30 minutes to simulate the sunrise scene in the morning in nature. After the combined irradiation is completed, the second light source is irradiated alone for 20 to 30 minutes to simulate the sunset in the evening. The rest of the time is rest at night.

Compared with the prior art, the present invention has the advantage that: in the present invention, only two different light source lamps are needed to meet the lighting needs of the whole growth cycle of plants. In addition, since the type and number of LED devices are reduced, the cost of the lighting source can be greatly reduced, and the design of the LED driver is also simplified and the cost of the LED driver is reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in this application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 shows the spectrogram of the first light source in the specific embodiment of the present invention;

Fig. 2 shows the spectrogram of the second light source in the specific embodiment of the present invention;

Fig. 3 is a schematic diagram of the irradiation time and intensity of the illumination light source on the plant at different growth stages of the plant in a specific embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The plant lighting light source includes two light sources, respectively the first light source and the second light source. In this embodiment, through the combination of the first light source and the second light source, different spectral bands of light are output, so as to meet the requirements of chlorophyll in different growth stages. Requirements for lighting in different spectral bands.

The first light source includes a first light-emitting chipset and red fluorescent powder packaged on the outer surface of the first light-emitting chipset. The first light-emitting chip group is composed of a purple LED chip, a blue LED chip and a blue-green LED chip connected in series. Among them, the emission wavelength of the purple LED chip after excitation is 423~443nm, preferably 440nm; the emission wavelength of the blue LED chip after excitation is 455~465nm, preferably 465nm; the emission wavelength of the blue-green LED chip after excitation is 480~500nm , preferably 485nm; the emission wavelength of the red phosphor after excitation is 600-780nm. In the first light source, the light power ratio of the first light-emitting chipset to the red phosphor is (1.6-2.4):1, preferably 2:1, and the whole constitutes a purple light lamp.

Please refer to Figure 1 for the spectrum diagram after the excitation of the first light source, where the emission wavelength of the purple LED chip is 440nm, the emission wavelength of the blue LED chip is 465nm, and the emission wavelength of the blue-green LED chip is 485nm. The power ratio of group to red phosphor is 2:1.

The second light source includes a second light-emitting chipset and red fluorescent powder packaged on the outer surface of the second light-emitting chipset. The second light-emitting chip group is composed of a purple LED chip, a blue LED chip and a blue-green LED chip connected in series. Among them, the emission wavelength of the purple LED chip after excitation is 423~443nm, preferably 440nm; the emission wavelength of the blue LED chip after excitation is 455~465nm, preferably 465nm; the emission wavelength of the blue-green LED chip after excitation is 480~500nm , preferably 485nm; the emission wavelength of the red phosphor after excitation is 600-780nm. In the second light source, the light power ratio of the second light-emitting chipset to the red phosphor is 1:(4.8~7.2), preferably 1:6, and the whole constitutes a pink light lamp.

Please refer to Figure 2 for the spectrum diagram after excitation by the second light source, where the emission wavelength of the purple LED chip is 440nm, the emission wavelength of the blue LED chip is 465nm, and the emission wavelength of the blue-green LED chip is 485nm. The power ratio of group to red phosphor is 1:6.

As shown in Fig. 3, according to the light absorption spectrum required by chlorophyll in different growth stages of plants, the light power ratio of the first light source and the second light source is adjusted to output the corresponding spectrum for combined irradiation of plants.

In the germination stage, the plants are irradiated for 12-18 hours by the combination of the first light source and the second light source every day (24 hours), and the specific irradiation time is adjusted according to the season. Before the start of combined irradiation, the second light source is irradiated alone for 15 to 30 minutes to simulate the sunrise in the morning in nature. After the combined irradiation is completed, the second light source is irradiated alone for 15 to 30 minutes to simulate the sunset in the evening. Time for night break. When the first light source and the second light source perform combined irradiation, the light power ratio of the first light source and the second light source is 2:1. The light power of the second light source remains unchanged when combined irradiation and single irradiation are performed.

Before flowering, the plants are irradiated for 12-18 hours in combination by the first light source and the second light source every day (24 hours), and the specific irradiation time is adjusted according to the season. Before the start of combined irradiation, the second light source is irradiated alone for 15 to 30 minutes to simulate the sunrise in the morning in nature. After the combined irradiation is completed, the second light source is irradiated alone for 15 to 30 minutes to simulate the sunset in the evening. Time for night break. When the first light source and the second light source perform combined irradiation, the light power ratio of the first light source and the second light source is 2:1. The light power of the second light source remains unchanged when combined irradiation and single irradiation are performed.

In the flowering stage, the plants are irradiated for 12-18 hours by the combination of the first light source and the second light source every day (24 hours), and the specific irradiation time is adjusted according to the season. Before the start of combined irradiation, the second light source is irradiated alone for 20 to 30 minutes to simulate the sunrise in the morning in nature. After the combined irradiation is completed, the second light source is irradiated alone for 20 to 30 minutes to simulate the sunset in the evening. Time for night break. When the first light source and the second light source perform combined irradiation, the light power ratio of the first light source and the second light source is 1:2. The optical power of the second light source remains unchanged when combined irradiation and single irradiation are performed.

Since different growth stages in the plant production process require different proportions of light irradiation, the ratio of (purple light + blue light + blue-green light) to red light in the light source can be adjusted in at least two ways: 1. Adjust the amount of red phosphor in the LED package 2. Adjust the ratio of purple light + blue light + blue green light to red light in the light source by adjusting the driving current of purple light, blue light and blue green light LED.

In the present invention, only two different light source lamps are needed to meet the lighting needs of the whole cycle of plant growth: one is (purple light + blue light + blue-green light) and the light power ratio of the light emitted by LED and red phosphor is 2 to 1 (purple light); the other is (purple light + blue light + blue-green light) the light power ratio of the light emitted by the LED to the red phosphor is 1 to 6 (pink light).

Since the types and number of LED devices are reduced, the cost of lighting sources can be greatly reduced; and the design of LED drivers is also simplified and the cost of LED drivers is reduced; due to the selection of efficient and suitable violet and blue wavelength chips and suitable Phosphor powder, the photoelectric conversion efficiency of the system is high; the effect of helping plants grow is good.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description is only the specific implementation of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, some improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims (10)

1. a plant illumination light source, is characterized in that, comprising:

First light source, described first light source comprises the first luminescence chip group and is packaged in the red fluorescence powder of described first luminescence chip group outer surface, described first luminescence chip group is formed by a purple light chip, a blue chip and a blue green light chip-in series, in this first light source, the luminous power ratio of the first luminescence chip group and red fluorescence powder is (1.6 ~ 2.4): 1;

Secondary light source, described secondary light source comprises the second luminescence chip group and is packaged in the red fluorescence powder of described second luminescence chip group outer surface, described second luminescence chip group is formed by a purple light chip, a blue chip and a blue green light chip-in series, in this secondary light source, the luminous power ratio of the second luminescence chip group and red fluorescence powder is 1:(4.8 ~ 7.2).

2. plant illumination light source according to claim 1, it is characterized in that: in described first light source and secondary light source, emission wavelength after described purple light chip excites is 423 ~ 443nm, emission wavelength after described blue chip excites is 455 ~ 465nm, emission wavelength after described blue green light chip excites is 480 ~ 500nm, and the emission wavelength after described red fluorescence powder excites is 600 ~ 780nm.

3. plant illumination light source according to claim 2, is characterized in that: the emission wavelength after described purple light chip excites is 440nm, and the emission wavelength after described blue chip excites is 465nm, and the emission wavelength after described blue green light chip excites is 485nm.

4. plant illumination light source according to claim 1, is characterized in that: the luminous power ratio of described first luminescence chip group and red fluorescence powder is 2:1, and the luminous power ratio of described second luminescence chip group and red fluorescence powder is 1:6.

5. utilize the method that the arbitrary described plant illumination light source of claim 1 to 4 irradiates plant, it is characterized in that, required for the different stage of growth chlorophyll of plant, absorb the illumination of spectral coverage, the luminous power ratio adjusting the first light source and secondary light source carries out combination irradiation to export corresponding spectral coverage to plant.

6. the plant illumination light source according to claim 5 method of irradiating plant, is characterized in that: in the plant germination stage and before blooming, the luminous power ratio of described first light source and secondary light source is 2:1.

7. plant illumination light source according to claim 6 method that plant is irradiated, it is characterized in that: in the plant germination stage, the irradiation time of the first light source described in every 24 hours and secondary light source combination is 12 ~ 18 hours, 15 to 30 minutes sunrise sights in order to simulating nature circle morning are irradiated separately by secondary light source before combination irradiation starts, after combination irradiation completes, irradiate separately 15 to 30 minutes situations in order to simulation sunset at dusk by secondary light source, other times are night's rest.

8. plant illumination light source according to claim 6 method that plant is irradiated, it is characterized in that: at plant germination to before blooming, the irradiation time of the first light source described in every 24 hours and secondary light source combination is 12 ~ 18 hours, 15 to 30 minutes sunrise sights in order to simulating nature circle morning are irradiated separately by secondary light source before combination irradiation starts, after combination irradiation completes, irradiate separately 15 to 30 minutes situations in order to simulation sunset at dusk by secondary light source, other times are night's rest.

9. the plant illumination light source according to claim 5 method of irradiating plant, it is characterized in that: in the flowering of plant stage, the luminous power ratio of described first light source and secondary light source is 1:2.

10. plant illumination light source according to claim 9 method that plant is irradiated, it is characterized in that: in the flowering of plant stage, the time of the first light source and secondary light source combination irradiation described in every 24 hours is 12 ~ 18 hours, 20 to 30 minutes sunrise sights in order to simulating nature circle morning are irradiated separately by secondary light source before combination irradiation starts, after combination irradiation completes, irradiate separately 20 to 30 minutes situations in order to simulation sunset at dusk by secondary light source, other times are night's rest.