Actual photosynthetic efficiency-based LED light supplement control system and control method thereof

Abstract

The invention discloses an actual photosynthetic efficiency-based LED light supplement control system and a control method thereof. According to maximum utilization of plant on light, the brightness of an LED light supplement lamp is dynamically adjusted in real time, so that maximum utilization ratio of the plant on the light is achieved on the premise of ensuring photosynthetic ratio of the plant. Light luminous flux density FFPD(Y) required when the photosynthetic efficiency of the plant reaches a set value Lambda under different temperatures and humidity is analyzed and calculated by a large amount of experimental data, the photosynthetic efficiency of the plant is fed back in real time by a fluorescent sensor, and the illumination intensity of an LED is fed back and controlled in real time by pulse width modulation (PWM) digital dimming. By the light supplement method, real-time, accurate and energy-saving light supplement can be achieved from the demand of the plant.

Description

technical field [0001] The invention relates to the field of agricultural equipment, in particular to an LED supplementary light control system and control method based on actual photosynthetic efficiency. Background technique [0002] During the growth of crops, light conditions have an important impact on the growth rate, yield and quality of crops. At this stage, most of the facility agriculture in my country still relies on light sources such as incandescent lamps and high-pressure sodium lamps to supplement light for plants. These traditional supplementary light methods have disadvantages such as unreasonable spectrum and low utilization rate of light energy. LED light source is an ideal substitute of traditional light source, with obvious energy-saving effect, and its greatest potential is to realize the intelligent control of light quality, light intensity and photoperiod. [0003] The traditional determination of photosynthetic capacity usually uses the net photosyn...

AI Technical Summary

Problems solved by technology

The current chlorophyll fluorescence monitoring system, for example, Ji Jianwei and Xie Fei’s LED excitation light source chlorophyll fluorescence parameter online monitoring system, uses the MIN-PAM fluorescence instrument to collect fluorescence parameters, does not use the corresponding fluorescence sensor, and can only be used for scientific research research, and cannot be used in actual development and application

In the patents related to fluorescence parameters, most of them perform fixed-value supplementary light or use photosynthetic rate as the only supplementary light index. For example, in the patent of a dynamic supplementary light method for greenhouses, only photosynthetic rate is used as the only supplementary light index. Does not take into account the light use efficiency of plants

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