CN103104839A - Light supplemental device of plant and light supplemental method thereof - Google Patents

Abstract

The invention discloses a light-emitting diode (LED) four-color light supplemental device of a plant. The light supplemental device of the plant comprises a red-light LED array, a blue-light LED array, a far-red-light LED array, a green-light LED array, a substrate 5 and a control circuit, wherein the red-light LED array, the blue-light LED array, the far-red-light LED array and the green-light LED array are sequentially and fixedly arranged on the substrate 5, and the control circuit is used for controlling the red-light LED, the blue-light LED, the far-red-light LED, and the green-light LED to supplement light. According to the light supplemental device of the plant and a light supplemental method of the plant, the four-color light LED with a specific specification is selected, not only are colored lights which have a plurality of wavelengths and specific effects on plants by means of centralization of a variety of photosynthesis considered, but also economy and practicability are further taken into account. Meanwhile, considering the comfort of the human eyes, the four-color light LED with normal colors such as red, blue, far-red and green are selected. When the color lights are selected, according to the power of the selected LED with various colors, a reasonable ratio of R/B, R/FR and R/G can be obtained through the control circuit, thus the photosynthesis of the plant and the comfort requirement of the eyes of human can be met, and the requirements of orientation of cultivation of the plant with the need of participation of human can be better met.

Description

Plant lighting device and lighting method thereof

technical field

The invention relates to the field of application of LEDs in non-sunlight seedling cultivation in agriculture, and in particular to a device for supplementing light for plants.

Background technique

Different wavelengths of light have different effects on plant photosynthesis. The light energy absorbed by the light required for plant photosynthesis in the visible light spectrum (380-760nm) accounts for about 60%-65% of its physiological radiation light energy, of which Mainly red and orange light with a wavelength of 610-720nm (peak of 660nm) (accounting for about 55% of physiological radiation) and blue and purple light of wavelength 400-510nm (peak of 450nm) (accounting for about 8% of physiological radiation) is the absorption peak area. The 520-610nm (green) light has a very low rate of absorption by plant pigments. Far-red light (710nm ~ 740nm) LED has a great influence on plant morphogenesis and regulation of plant height growth. Therefore, the development of the two bands of red and blue peaks as the main body, and the auxiliary far-red supplementary light module will improve the light energy utilization efficiency of the light source. The white color of sunlight is a compound color, and the three primary colors of light are red, blue and green. The purpose of adding green light is to make the color environment of the supplementary light facility whiter, so that the operator can work comfortably for a long time without dizziness.

Due to long-term environmental adaptability, different plants have specific requirements for light, that is, the light quality, light quantity and photoperiod required by different plants in different growth stages are quite different. According to the different needs for light intensity, plants can be divided into sun plants and shade plants. However, the number of chloroplasts of sun and shade plants is quite different, so they have different absorption bandwidths in different spectra, resulting in different requirements for a certain wavelength of light quantum flux density. Even for the same plant, the light intensity required for its germination period and vegetative growth period is also different.

The current LED applications in plant growth are mostly LED single lights that are suitable for the light demand characteristics of a certain plant, and their light color is fixed, which cannot meet the light demand of another plant. Therefore, according to the composition ratio of chlorophyll a/b in different plants, LEDs are used for system design, LEDs are controlled by different circuits to achieve a variety of composite light colors, and the light source system is controlled by configuration to meet different plants and different conditions. Different light needs of growth stages.

The ratio of luminous flux between 610-720nm red light and 710-740nm far-infrared light, that is, R/FR ratio, has an important influence on plant height regulation. 610-720nm red light can reduce the content of gibberellin in plants, thereby reducing the internode length and plant height; while the effect of 710-740nm far-infrared light is just the opposite, can increase the content of gibberellin in plants, thereby increasing Internode length and plant height. The R/FR ratio has become an important evaluation parameter for controlling plant height.

CN100587326 discloses a light-emitting diode combination method and its module with a uniform ratio of red and blue light, but there is no far-red LED to participate in the matching, and the problem of uniform distribution of the ratio (R/FR) of the luminous flux of the red and far-red LEDs cannot be solved; CN201475731 Announced a kind of LED plant lighting, with green LED and blue LED two kinds of monochromatic light as candlelight, with red, yellow, green, blue, purple light as auxiliary photosynthesis light source, and there is no participation of far-infrared light LED, The main light and auxiliary light overlap, which is not clear in the specific application stage of plant seedlings.

Contents of the invention

(1) Technical problems to be solved:

The technical problem to be solved by the present invention is to design a four-color LED combination supplementary light that takes into account the ratio of R/B (red/blue) and R/FR (red/far red) and the amount of green light, which can satisfy The needs of plants to fill light, while making the human eyes as comfortable as possible.

(2) Technical solution:

In order to solve the above-mentioned technical problems and achieve the above-mentioned purpose, the present invention provides a four-color LED combination supplementary light device, comprising: a red LED array, a blue LED array, a far-red LED array, a green LED array, a substrate 5 and Control circuit;

Wherein said red light LED array, blue light LED array, far red light LED array and green light LED array are sequentially arranged and fixed on the substrate 5; said control circuit is used to control red light LED, blue light LED, far red light LED, Green LED for supplementary light.

Wherein, the control circuit includes a control module, a detection module and a supplementary light module; the detection module is used to detect the illuminance of the environment where the plant supplementary light is located, and transmit the illuminance detection result to the control module, and the control module According to the detection result of the illuminance, it is determined whether supplementary light is needed, and if necessary, the supplementary light module is notified, and the supplementary light module performs supplementary light of the corresponding color light.

The present invention also discloses a method for supplementing light by using the LED four-color plant light supplementing device, which includes:

Step 1, the control module notifies the detection module to detect the ambient temperature;

Step 2, the control module judges whether the ambient temperature detected by the detection module is within the threshold range, if so, the control module notifies the detection module to detect the illuminance of the four-color lights respectively;

Step 3. If the control module judges that the illuminance of the four-color light is within their respective threshold ranges, calculate the amount of supplementary light for the four-color light, and notify the supplementary light module to perform supplementary light according to the amount of supplementary light;

Step 4. If the control module determines that the ambient temperature detected by the detection module is not within the threshold range or the illuminance of at least one light is not within the threshold range, then notify the supplementary light module to turn off all LED lights.

(3) Beneficial effects

The effective effect of the present invention is that the four-color LED with specific specifications is selected, not only considering the concentration of a variety of colored lights with multiple wavelengths that have specific effects on plant photosynthesis as much as possible, but also taking into account the economy and practicality, and at the same time considering the comfort to the human eye , so as to select the common red, blue, far red, and green four-color LEDs. While selecting the color light, according to the power of the selected LEDs of each color, a reasonable ratio of R/B, R/FR, and R/G can be obtained through the control circuit. It meets the requirements of plant photosynthesis and human eye comfort, and is more in line with the needs of plant-oriented cultivation that requires human participation.

Description of drawings

Fig. 1 is a schematic structural view of the arrangement of four-color light LEDs in the plant supplementary light device of the present invention;

Fig. 2 is a schematic circuit diagram of the control device in the plant light supplement device of the present invention;

Fig. 3 is a control flowchart of the control device in the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The invention discloses a plant supplementary light, in particular to an LED four-color plant supplementary light.

The LED four-color plant fill light includes: a red LED array 1, a blue LED array 2, a far-red LED array 3, a green LED array 4, a rectangular substrate 5, connecting wires and a control circuit; wherein the The red LED array 1 , the blue LED array 2 , the far-red LED array 3 and the green LED array 4 are sequentially arranged and fixed on the substrate 5 .

The arrangement of red light LED1, blue light LED2, far red light LED3 and green light LED4 on the substrate 5 is as follows: if the number of blue light LEDs and far red light LEDs is n, then the number of green light LEDs is 2n, then the number of red light LEDs The number of is 8n. Green LEDs are distributed in the center of the substrate, a single row of blue LEDs and far-red LEDs are distributed beside the green LEDs, and red LEDs are distributed outside the substrate. Figure 1 shows a preferred arrangement, that is, the arrangement of the LED array on the substrate 5 is row-to-column spacing, each row is arranged with LEDs of the same color, and the red LED1 array is arranged on the upper edge and the lower edge, with four consecutive rows on the upper edge Arrange red LEDs, red LEDs are arranged in four consecutive rows from the bottom edge, blue LEDs are arranged in the fifth row from the upper edge, far-red LEDs are arranged in the sixth and seventh rows, and green LEDs are arranged in the eighth row, neatly arranged one by one .

The distribution density of red LEDs on the substrate is 1200-2000/m2, the distribution density of blue LEDs on the substrate is 150-250/m2, the distribution density of far-infrared LEDs on the substrate is 150-250/m2, green The distribution density of light LEDs on the substrate is 300-500/m2. Each LED is evenly spaced, and the center distance is 1-1.2cm.

The present invention proceeds from the actual situation that most plants require light intensity, and comprehensively considers the appropriate ratio of R/B, R/FR and the appropriate green light intensity, and determines the selected four-color LED specifications as follows:

Red LED: wavelength 620-670nm, line width 20nm, single power 0.2-1W;

Blue LED: wavelength 420-470nm, line width 20nm, single power 0.2-1W;

Far red LED: wavelength 720-735nm, line width 20nm, single power 0.2-1W;

Green LED: wavelength 520-540nm, line width 30nm, single power 0.2-1W.

Figure 2 shows the schematic diagram of the control circuit. The control circuit includes a control module, a power module, a detection module, a supplementary light module, an early warning module and a user interaction module. Wherein, the detection module, supplementary light module, early warning module and user interaction module are respectively connected to the control module through data lines. The control module is responsible for controlling and coordinating the detection module, power module, early warning module, supplementary light module and user interaction module to realize the preset of supplementary light brightness and access to the internal parameters of the lamp. Figure 3 shows the specific control process of the control module Figure: The user interaction module displays the relevant information of the plant supplementary light for the user in the form of text, sound and image. According to the supplementary light requirements of different plants and different growth stages of the same plant, the user can use the button array in the user interaction module or The touch screen inputs control parameters, and the control parameters are used to control the supplementary light module to turn off, turn on or adjust the brightness of the LED lights; the detection module detects the ambient temperature and the four-color light illumination in real time, and transmits the detection signal to the control module after processing to realize The data acquisition of temperature, illuminance, described detection module can realize with thermistor (temperature detection) and semiconductor detector (illuminance detection) etc.; Early warning module comprises buzzer and indicator light, and its monitoring LED fill light work Status, to judge whether the light group is working normally, such as overvoltage, overcurrent, overbrightness, etc., and send a warning message through the buzzer and indicator light; the supplementary light module uses the LED to drive the commonly used pulse width according to the instructions of the control module Modulation control technology, respectively control the brightness of the four-color LED fill light. The power module provides power support for other modules in the circuit. It provides 5V power supply for the temperature detection circuit in the control module, early warning module, user interaction module and detection module, and provides 3V for other parts of the detection module except the temperature detection circuit. Voltage power supply support, providing 220V voltage power supply support for the supplementary light module.

Fig. 3 is a specific flow chart of the control module implementing control. After the control module is turned on, it first asks whether the system needs to be initialized, and if it needs to be initialized, it will prompt to set the temperature and illuminance threshold. If the system does not need to be initialized, it will enter the program of collecting ambient temperature. The control module controls the temperature detection circuit of the detection module to collect the temperature. After the temperature is collected, it is judged whether the temperature is within the preset threshold range. If the temperature detection circuit detects that the temperature is no longer within the threshold Within the period, the control module will control the supplementary light module to turn off the light group, that is, turn off all LED lights, and the shutdown time will be maintained for about N minutes. After N minutes, the optimal value of N is 2; the control module turns on the supplementary light module. For the supplementary light group, continue to collect the ambient temperature and determine whether the temperature is within the threshold. If the temperature still exceeds the threshold, the number of maintenance shutdown cycles will be increased by 1, and the corresponding global variable in the program will be increased by 1. When the corresponding global variable is greater than or equal to 3 That is, when the number of shut-off cycles is maintained greater than or equal to 3, the control module drives the early warning module to display error status information in the form of sound, image and text; the control module judges whether the temperature is within the threshold through the temperature detection circuit. Within the threshold, the control module will enter the four-color light illumination detection link. The control module obtains the illuminance information from the red light, blue light, green light and far-red light detection circuit of the detection module, and judges the red light, blue light, green light and far-red light respectively. Whether the illuminance of red light is within the threshold, if the illuminance of one color is not within the threshold, the control module will enter the link of turning off the light group of the supplementary light module and maintaining the number of off cycles as if the temperature is not within the threshold , drive the early warning module to display error status information according to the number of maintenance shutdown cycles. If the illuminance of red light, blue light, green light and far-red light are all within the threshold, the control module will respectively calculate the amount of supplementary light for red light, blue light, green light and far-red light and drive the supplementary light module to perform supplementary light. The amount of supplementary light mentioned above is calculated according to the supplementary light requirements of different plants in different growth stages. After the supplementary light is executed, the control module recycles to the link of collecting ambient temperature, and continues to collect and judge the temperature and illuminance. After the control module program drives the supplementary light module to turn off, the staff can restart the control module program after detecting the factors that cause the ambient temperature to exceed the threshold and the failure of the supplementary light module. The above process of the control module can be realized by computer program or hardware programming.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An LED four-color plant lighting device, comprising: a red LED array, a blue LED array, a far-red LED array, a green LED array, a substrate 5 and a control circuit; Wherein said red light LED array, blue light LED array, far red light LED array and green light LED array are sequentially arranged and fixed on the substrate 5; said control circuit is used to control red light LED, blue light LED, far red light LED, Green LED for supplementary light. 2. The plant supplementary light device according to claim 1, wherein the red LED array, the blue LED array, the far-red LED array and the green LED array are arranged in rows and columns at intervals on the substrate , where if the number of blue LEDs and far-red LEDs is n, then the number of green LEDs is 2n, and the number of red LEDs is 8n; the green LEDs are distributed in the center of the substrate, and the green LEDs are distributed in a single row Blue LEDs, far-red LEDs, and red LEDs are distributed on the outside of the substrate. 3. The plant light supplement device according to claim 1, wherein the distribution density of the red LEDs on the substrate is 1200-2000/m2, and the distribution density of the blue LEDs on the substrate is 150-250/m2. m2, the distribution density of far-infrared LEDs on the substrate is 150-250/m2, and the distribution density of green LEDs on the substrate is 300-500/m2; the LEDs are evenly spaced, and the center distance of each LED is 1- 1.2cm. 4. The plant light supplement device according to claim 1, wherein the red light LED is a circular red light LED with a wavelength of 620nm-670nm, a line width of 20nm, and a single power of 0.2-1W, and a blue light LED The LED is a circular blue light LED with a wavelength of 420nm-470nm, a line width of 20nm, and a single power of 0.2-1W. Far-infrared LEDs have a wavelength of 720-735nm, a line width of 20nm, and a single power of 0.2-1W. Circular far-infrared LED, green LED is a circular green LED with a wavelength of 520-540nm, a line width of 30nm, and a single power of 0.2-1W. 5. The plant supplementary light device according to claim 1, wherein the control circuit includes a control module, a detection module and a supplementary light module; the detection module is used to detect the environment of the plant supplementary light illuminance, and transmit the illuminance detection result to the control module, the control module determines whether supplementary light is needed according to the illuminance detection result, and if necessary, notifies the supplementary light module, and the supplementary light module executes the supplementary light of the corresponding color light. 6. The plant supplementary light device according to claim 5, wherein the detection module is also used to detect the temperature of the environment where the plant supplementary light is located, and transmit the temperature detection result to the control module, The control module judges whether the temperature is within the threshold range according to the temperature detection module, and if not, notifies the supplementary light module to turn off all LED lights. 7. The plant light supplement device according to claim 5, wherein the detection results of the illumination include four illumination detection results of red light, blue light, far-infrared light and green light respectively, and the control module judges the four Whether the light intensity of each kind is within the threshold range, if it is not within the threshold range, calculate the supplementary light amount of the corresponding light, and notify the supplementary light module to perform the supplementary light of the corresponding color light. 8. The plant light supplementing device according to claim 5, wherein the control module further comprises a user interaction module, the user interaction module comprises a display and a keyboard, which receives the control parameters input by the user through the keyboard, And display the relevant information of the plant light supplementing device on the display. 9. The plant light supplement device according to claim 5, wherein the control module further comprises a power supply module and an early warning module, the power supply module is used to provide power to the plant light supplement device, and the early warning module It is used to detect the working status of the LED lights of various colors, and to send out an early warning signal when an abnormality occurs. 10. A method for supplementing light utilizing the LED four-color plant light supplementing device according to claim 5, comprising: Step 1, the control module notifies the detection module to detect the ambient temperature; Step 2, the control module judges whether the ambient temperature detected by the detection module is within the threshold range, if so, the control module notifies the detection module to detect the illuminance of the four-color lights respectively; Step 3. If the control module judges that the illuminance of the four-color light is within their respective threshold ranges, calculate the amount of supplementary light for the four-color light, and notify the supplementary light module to perform supplementary light according to the amount of supplementary light; Step 4. If the control module determines that the ambient temperature detected by the detection module is not within the threshold range or the illuminance of at least one light is not within the threshold range, then notify the supplementary light module to turn off all LED lights.

Images