CN102630511A - Adjustable full spectrum LED (light-emitting diode) light source device for plant growth - Google Patents
Adjustable full spectrum LED (light-emitting diode) light source device for plant growth Download PDFInfo
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Abstract
The invention discloses an adjustable full spectrum LED (light-emitting diode) light source device for the plant growth, and relates to a semiconductor solid state lighting source. A power supply of the invention supplies power for a control system and a drive circuit, and is controlled by the control system; the control system provides intelligent control for data input, data output, operation processing, storage and clock, provides data for light adjusting for the drive circuit, and input the basis data for adjusting the spectral power distribution of the light source, the photon flux intensity and the photoperiod from exterior into a storage inside the control system; the drive circuit provides steady direct current or pulse width modulation power supply for an illuminant; the basic unit of the illuminant is composed of a plurality of UV (ultraviolet) -B, UV-A, blue light, green light, yellow light, red light and far-red light LEDs. The adjustable full spectrum LED light source device has the full spectrum lighting condition required by the plant growth, also the spectral power distribution, the photon flux intensity and the photoperiod can be adjusted according to different requirements on light source of different plants in different growth phases, so that the best lighting condition is provided for the plant growth.
Description
Technical field
The present invention relates to the semiconductor solid lighting light source, compose the tunable light source device entirely especially for the LED of plant growing.
Background technology
The artificial light source that is used for plant growing has been widely used in the cultivation of vegetables in the greenhouse, fruit, flowers and other crops.These artificial light sources can perhaps use as light filling under the condition of sunshine shortage there not being use separately under the sunshine condition, help plant normal growth.Common artificial light source has incandescent lamp, fluorescent lamp, high-pressure mercury lamp or mercury lamp etc.But; The spectral power distribution of these traditional plant growth light sources is fixed; The adjustable extent of luminous flux density is less; Can not be complementary with the required perfect light source condition of plant growing, different still more plants also there are differences in the demand of different vegetative stages to light source, have so just caused the waste of light source.In addition, also there is inferior position in these artificial light sources at aspects such as electro-optical efficiency and service lifes.
Compare above-mentioned traditional plant growth light source, led light source all shows remarkable advantages aspect many, but, antidetonation little like energy-saving and environmental protection, long-life, volume, waterproof and dampproof, low-voltage direct drive advantages such as pulse-width modulation PWM output.LED is that a kind of spectrum is narrower, and monochromaticjty is semi-conductor solid-state light source preferably, and its spectrum halfwidth is about 15 ~ 30nm, and the spectrum peak wavelength covers the All Ranges scope from the ultraviolet light to the near infrared light.According to the Haitz theorem, following LED industry will increase with the mode of luminous powers increase by 20% in per 10 years, prices decline 10% fast.Therefore, led light source not only can overcome the shortcoming of traditional plant growth light source, and has good market development potentiality.
In the prior art, use LED to carry out report as the existing many home and abroads of plant growth light source patent.Disclose by the red-light LED of two kinds of different beam angles, different peak wavelengths and the promotion plant growth lamp that blue-ray LED is formed for the EFFICIENT LED LAMP FOR ENHACING COMMERCIAL AND HOME PLANT GROWTH of US6921182B2 like u. s. patent number; And for example the Chinese patent publication number is that " the high-efficiency energy-saving LED plant ecological lamp " of CN1596606A discloses a kind of plant growth light source that is combined to form by blue-ray LED or red-light LED or blue light and red-light LED.Above-mentioned technology has only used blue light and red-light LED as the growth light source; Mainly considered these light sources to photosynthetic contribution, but ignored of the influence of other band spectrum plant physiology function (switching, chloroplast migration, seed sprouting, the rice shoot like pore taken root, the light form is reacted, keep away shady reaction, floral induction or the like).
According to pertinent literature (Vol. 157, Pages:393-414,2010 for I. V nninen et al., Annals of Applied Biology) report, plant has " band selective " to the absorption of light source.In spectrum of sunlight, the wavelength region may that can exert one's influence to plant is 280 ~ 800nm wavelength band.Further, can above-mentioned wave band be divided into following seven parts again: 1. UV-B (280 ~ 320nm), 2. UV-A (320 ~ 390nm), 3. blue light (390 ~ 500), 4. green glow (500 ~ 580nm), 5. gold-tinted (580 ~ 600nm), 6. ruddiness (600 ~ 700nm), 7. far-red light (700 ~ 800nm).(Vol. 8 for Y. L. Jiao et al., Natural Reviews Genetics according to another the pertinent literature report; Is. 3; Pages:217-230,2007), plant (higher plant) is inseparable with the various photoreceptors that it has to " band selective " of light source.Photoreceptor in the plant corpus can be divided into four kinds at least: UV-B photoreceptor, Xiang Guangsu, cryptochrome and phytochrome, and they are responsible for selective light in 280 ~ 800nm wave-length coverage being carried out perception, and concrete wave band distributes as shown in Figure 1.These perceptrons can conduct the gene regulatory network to plant corpus with the illumination information of external environment, and then influence physiological characteristics such as growth, growth, genetic character expression.On the other hand, the ratio between the various wave band light sources also can influence plant growing.Different plants are different at different vegetative stages to spectral power distribution, photon flux intensity, the photoperiodic demand of light source.But LED light source of the prior art is not all looked after above-mentioned plant and is reached the demand that various light characteristics are regulated at spectral band, different vegetative stage.
Summary of the invention
In order to overcome the shortcoming of LED plant growth light source in the above-mentioned prior art, the purpose of this invention is to provide a kind of LED that is used for plant growing and compose the tunable light source device entirely.It possesses the required all band illumination condition of plant growing; And it can be according to different plants in the demands of different of different vegetative stages to light source; Spectral power distribution, photon flux intensity and the photoperiod of adjustment light source are for plant growing provides best illumination condition.
In order to reach the foregoing invention purpose, technical scheme of the present invention realizes as follows:
A kind of LED that is used for plant growing composes the tunable light source device entirely, and its design feature is that it comprises power supply, control system, drive circuit and illuminator.Power supply is that control system and drive circuit provide electric energy and be controlled the control of system; The control system provides the intelligent control of data input, data output, calculation process, storage and clock and for drive circuit provides the light modulation data, to being input in the intrasystem holder of control by the outside according to data of adjusting of light source light spectral power distributions, photon flux intensity, photoperiod; Drive circuit is that illuminator provides steady direct current or pulse width modulated power supply; The elementary cell of illuminator is made up of UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light LED of some quantity.
Compose the tunable light source device entirely at the above-mentioned LED that is used for plant growing, the quantity of the UV-B in the said illuminator elementary cell, UV-A, blue light, green glow, gold-tinted, ruddiness and far-red light LED all desirable 0,1,2,3,4,5 ... Nonnegative integer.The peak wavelength scope of UV-B LED is 280 ~ 320nm; The peak wavelength scope of UV-A LED is 320 ~ 390nm; The peak wavelength scope of blue-ray LED is 390 ~ 500nm; The peak wavelength scope of green light LED is 500 ~ 580nm; The peak wavelength scope of yellow light LED is 580 ~ 600nm; The peak wavelength scope of red-light LED is 600 ~ 700nm; The peak wavelength scope of far-red light LED is 700 ~ 800nm.
Compose the tunable light source device entirely at the above-mentioned LED that is used for plant growing, the intrasystem holder of said control is IC chip or the module with EEPROM or Flash of data memory function.
The present invention is owing to adopted said structure; Parameters such as the peak wavelength position through selecting various LED in the illuminator, quantitative proportion, forward current intensity, PWM realize the adjusting to light source light spectral power distributions, photon flux intensity and photoperiod (24 hours); Make it to take into account the sound development of photosynthesis of plants and other physiological function, for different plants provide best illumination condition at different vegetative stages.Outstanding technique effect of the present invention is that it not only has the general advantage of led light sources such as energy-saving and environmental protection, long-life, and it also possesses the adjustable performance characteristics of full spectrum, for plant growing provides intelligence, efficient, comprehensively illumination nutrition.In addition, because led light source can give plant the longest light application time to greatest extent,, shorten cultivation and the harvest cycle of plant so adopt the present invention also can accelerate plant growing.
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Description of drawings
Fig. 1 is the wave band response range of various photoreceptors in the plant corpus;
Fig. 2 is the structural representation of apparatus of the present invention;
Fig. 3 gives an example for the linear light source of illuminator elementary cell of the present invention;
Fig. 4 gives an example for the area source of illuminator elementary cell of the present invention;
Fig. 5 is for illuminator among the present invention with by the locus sketch map of cultivation plant.
Embodiment
Referring to Fig. 2, apparatus of the present invention comprise power supply, control system, drive circuit and illuminator.Power supply is that control system and drive circuit provide electric energy and be controlled the control of system; The control system provides the intelligent control of data input, data output, calculation process, storage and clock and for drive circuit provides the light modulation data, to light source light spectral power distributions, photon flux intensity, photoperiod adjust be input to intrasystem EEPROM of control or Flash etc. according to data by the outside and have in the IC chip or module of data memory function; Drive circuit is that illuminator provides steady direct current or pulse width modulated power supply; The elementary cell of illuminator is made up of UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light LED of some quantity.The quantity of UV-B in the illuminator elementary cell, UV-A, blue light, green glow, gold-tinted, ruddiness and far-red light LED all desirable 0,1,2,3,4,5 ... Nonnegative integer.The peak wavelength scope of UV-B LED is 280 ~ 320nm; The peak wavelength scope of UV-A LED is 320 ~ 390nm; The peak wavelength scope of blue-ray LED is 390 ~ 500nm; The peak wavelength scope of green light LED is 500 ~ 580nm; The peak wavelength scope of yellow light LED is 580 ~ 600nm; The peak wavelength scope of red-light LED is 600 ~ 700nm; The peak wavelength scope of far-red light LED is 700 ~ 800nm.
Improve and replenish as the further of technique scheme, the present invention adopts following technical measures:
Before system's design, exploitation apparatus of the present invention; Should at first obtain spectral power distribution, photon flux intensity and the photoperiodic requirement of certain plant species in particular growth stage interior focusing source; These data should be to obtain through in advance plant cultivation experiment, the basic condition that they will be designed and developed as the present invention.During practical implementation, can be with the input of these data, store control of the present invention system into, be the illumination conditions that intelligence are provided, change of different plants at different growing stage.
In addition, be to guarantee the even mixing of various wave band LED outgoing photons in the light supply apparatus, should they be installed in the elementary cell of illuminator equably according to parameters such as the quantitative proportion of various LED, physical dimensions.When using apparatus of the present invention, can receive the irradiation of various LED in the illuminator unit fully, equably for guaranteeing every quilt cultivation plant, should note adjusting following changing factor: the beam angle of various LED in the ⑴ illuminator elementary cell; ⑵ illuminator is apart from the height of being cultivated plant; ⑶ cultivated the spacing of plant.
Selecting the peak wavelength in the illuminator elementary cell of the present invention is that 300nm, power are the UV-B LED of 0.05W; Peak wavelength is that 370nm, power are the UV-A LED of 0.1W; Peak wavelength is that 450nm, power are the blue-ray LED of 0.5W; Peak wavelength is that 520nm, power are the green light LED of 0.2W, and peak wavelength is that 590nm, power are the yellow light LED of 0.1W, and peak wavelength is that 650nm, power are the red-light LED of 1W; Peak wavelength is that 730nm, power are each 1 elementary cell of forming illuminator of far-red light LED of 0.1W, and evenly settles like the regular hexagon basic cell structure among Fig. 3 or Fig. 4.Further, can be according to actual needs, a plurality of elementary cells of illuminator are arranged as the linear light source, as shown in Figure 3; Perhaps elementary cell is arranged as area source, as shown in Figure 4.On design of drive circuit, the LED of same type is one group with some is cascaded, by independently driving IC chip power supply.
Then, illuminator is installed on the position of distance cultivation plant suitable distance.As shown in Figure 5; The height h of illuminator, the beam angle α of every kind of LED, β, γ, the spacing d of plant should meet some requirements; Guaranteeing that every plant can both receive the mixed uniformly irradiation of various wave band led light sources, and the rate of flow of each wave band photon should suit.Setting datas such as the drive current intensity of various LED, the frequency of PMW and dutycycle, time photoperiod will be imported in the control system of light supply apparatus, and system automatically performs by control.
Because different plants are different with the photoperiod requirement to spectral power distribution, the photon flux intensity of light source at different vegetative stages; So down in the face of several kinds of different plants in the enforcement of giving an example respectively of different vegetative stages; And other required condition of plant growing in the experiment below the supposition is like temperature, humidity, soil nutrient, moisture; Constituent of air, situation or the like all are equipped with good.
Embodiment one; Selection is in the wheat at heading stage and cultivates; UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light LED that above-mentioned illuminator unit is adopted gives respectively that current intensity is 10,20,150,60,20,350,20mA; And frequency is 250Hz, and dutycycle is respectively 50%, 50%, 100%, 100%, 50%, 100%, 100% PWM powering mode and drives.Further; According to the beam angle characteristic of various LED and the spacing of wheat plant; Confirm the setting height(from bottom) of illuminator, the rate of flow of UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light photon that receives with a bonding wheat plant is respectively 5,10,150,60,10,350,20
μMol m
-2s
-1In addition, the photoperiod of various led light sources all is set at every day 6:00 ~ 22:00 and carries out illumination.
Embodiment two; Selection is in the tomato seedling of growth stage and cultivates; UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light LED that above-mentioned illuminator unit is adopted gives respectively that current intensity is 10,20,50,10,10,100,20mA; And frequency is 250Hz, and dutycycle is respectively 10%, 100%, 100%, 50%, 50%, 100%, 50% PWM powering mode and drives.Further; According to the beam angle characteristic of various LED and the spacing of wheat plant; Confirm the setting height(from bottom) of illuminator, the rate of flow of UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light photon that receives with a bonding wheat plant is respectively 1,20,50,5,5,100,10
μMol m
-2s
-1In addition, the photoperiod of various led light sources all is set at every day 6:00 ~ 20:00 and carries out illumination.
Embodiment three; Selection is in the radish seedling of growth stage and cultivates; UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light LED that above-mentioned illuminator unit is adopted gives respectively that current intensity is 10,20,40,10,20,150,10mA; And frequency is 250Hz, and dutycycle is respectively 20%, 25%, 50%, 20%, 10%, 100%, 50% PWM powering mode and drives.Further; According to the beam angle characteristic of various LED and the spacing of wheat plant; Confirm the setting height(from bottom) of illuminator, the rate of flow of UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light photon that receives with a bonding wheat plant is respectively 2,5,20,2,2,150,5
μMol m
-2s
-1In addition, the photoperiod of various led light sources all is set at every day 6:00 ~ 18:00 and carries out illumination.
Example embodiment of the present invention is below just disclosed.For the person skilled of this area technology path, no substantial change part on embodiment and range of application according to instance of the present invention.Formed technical scheme also belongs to protection scope of the present invention.
Claims (3)
1. a LED who is used for plant growing composes the tunable light source device entirely, it is characterized in that, it comprises power supply, control system, drive circuit and illuminator, and power supply is that control system and drive circuit provide electric energy and be controlled the control of system; The control system provides the intelligent control of data input, data output, calculation process, storage and clock and for drive circuit provides the light modulation data, to being input in the intrasystem holder of control by the outside according to data of adjusting of light source light spectral power distributions, photon flux intensity, photoperiod; Drive circuit is that illuminator provides steady direct current or pulse width modulated power supply; The elementary cell of illuminator is made up of UV-B, UV-A, blue light, green glow, gold-tinted, ruddiness and the far-red light LED of some quantity.
2. the LED that is used for plant growing according to claim 1 composes the tunable light source device entirely, it is characterized in that the quantity all desirable 0 of the UV-B in the said illuminator elementary cell, UV-A, blue light, green glow, gold-tinted, ruddiness and far-red light LED; 1,2,3; 4,5 ... Nonnegative integer; The peak wavelength scope of UV-B LED is 280 ~ 320nm; The peak wavelength scope of UV-A LED is 320 ~ 390nm; The peak wavelength scope of blue-ray LED is 390 ~ 500nm; The peak wavelength scope of green light LED is 500 ~ 580nm; The peak wavelength scope of yellow light LED is 580 ~ 600nm; The peak wavelength scope of red-light LED is 600 ~ 700nm; The peak wavelength scope of far-red light LED is 700 ~ 800nm.
3. the LED that is used for plant growing according to claim 1 composes the tunable light source device entirely, it is characterized in that, the intrasystem holder of said control is IC chip or the module with EEPROM or Flash of data memory function.
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Application publication date: 20120815 |