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CN-122028253-A - Plant growth full spectrum LED intelligent driving and dimming system

CN122028253ACN 122028253 ACN122028253 ACN 122028253ACN-122028253-A

Abstract

The invention relates to the technical field of plant illumination, and discloses a plant growth full-spectrum LED intelligent driving and dimming system which comprises a full-spectrum LED array module, a driving module, a control module, a sensing module and a feedback regulation module, wherein the full-spectrum LED array module comprises five LED lamp beads which cover ultraviolet A wave bands, blue light, red light, far-red light and white light spectral ranges, and the driving module adopts a two-stage framework of a front-stage active PFC circuit and a rear-stage half-bridge LLC resonant converter. According to the intelligent driving and dimming system for the plant growth full-spectrum LEDs, the full-spectrum LED array module is optimized through a MATLAB exhaustion method to complete non-uniform layout, the illuminance sensor of the sensing module collects illumination data in a period of 100ms, the feedback regulation and control module calls the light equalizing control algorithm to combine with the lambertian equation and improve the Shockley equation to establish an accurate mathematical model, the double closed-loop inner loop adjusts PWM duty ratio of each LED branch in real time according to the accurate mathematical model, illumination difference is compensated rapidly, and the problem that the center is bright and the periphery is dark is thoroughly solved.

Inventors

  • JIANG ZEYU
  • WU LUNFENG
  • YANG ZHENKE
  • ZHANG WENJI
  • HUANG JIANBANG

Assignees

  • 华南农业大学

Dates

Publication Date
20260512
Application Date
20260402

Claims (10)

  1. 1. The intelligent driving and dimming system for the plant growth full-spectrum LED is characterized by comprising a full-spectrum LED array module, a driving module, a control module, a sensing module and a feedback regulation module; the full-spectrum LED array module comprises five LED lamp beads which cover ultraviolet A wave bands, blue light, red light, far-red light and white light spectral ranges and adopts non-uniform layout design; The driving module adopts a two-stage architecture of a front-stage active PFC circuit and a rear-stage half-bridge LLC resonant converter, wherein the front stage is of a Boost topological structure, and the rear stage comprises a resonant inductor, a resonant capacitor and a transformer; the control module takes a UCS512G6 control chip and an STM32F103 main chip as cores to realize a PWM dimming function; The sensing module is used for collecting illumination data and plant physiological parameters; The feedback regulation and control module dynamically adjusts the spectrum, the light intensity and the photoperiod according to the sensing data based on a spectrum fitting algorithm and a light homogenizing control algorithm, and realizes the accurate illumination regulation and control of the whole period of plant growth.
  2. 2. The intelligent driving and dimming system for the plant growth full-spectrum LED according to claim 1, wherein the five LED lamp beads of the full-spectrum LED array module are ultraviolet A band LED with the center wavelength of 395nm, blue LED with the center wavelength of 450nm, red LED with the center wavelength of 660nm, far-red LED with the center wavelength of 730nm and white LED with the color temperature of 3000K respectively, the non-uniform layout is obtained by optimizing by a MATLAB exhaustion method, the size of a receiving surface is set to be 900mm multiplied by 250mm, and the distance between the receiving surface and the array module is set to be 200mm.
  3. 3. The intelligent driving and dimming system for the plant growth full-spectrum LEDs according to claim 2 is characterized in that 395 nmLEDs are distributed in 1, 3 and 5 rows, each row is provided with 42 pieces of 14, 450 nmLEDs are distributed in 2 and 5 rows, each row is provided with 28 pieces of 14 pieces, 660 nmLEDs are distributed in 1, 3, 4 and 6 rows, each row is provided with 56 pieces of 14 pieces, 730 nmLEDs are distributed in 2, 4 and 6 rows, each row is provided with 42 pieces of 14 pieces, and 3000K white LEDs are filled in rest positions for 672 pieces, the row spacing of an array module is 9.2mm, and the column spacing is 8mm.
  4. 4. The intelligent driving and dimming system for the plant growth full-spectrum LED according to claim 1, wherein the front-stage active PFC circuit works in a critical conduction mode, the switching device is a MOS tube, the drain-source breakdown voltage is not lower than 540V, the maximum continuous drain current is not lower than 11.37A, the PFC boost inductor adopts a PC44PQ3535 magnetic core of TDK company, the number of turns of a main winding is 69, the number of turns of an auxiliary winding is 6, and the output capacitance capacity is 106 mu F.
  5. 5. The intelligent driving and dimming system for a plant growth full spectrum LED according to claim 1, wherein the resonant frequency of the rear half bridge LLC resonant converter is 100kHz, the frequency is optimally balanced among efficiency, electromagnetic interference suppression and element size, the resonant inductance value is 278 mu H, the resonant capacitance capacity is 9.3nF, the number of turns of a primary winding of a transformer is 67 turns, the number of turns of a secondary winding is 23 turns, the number of turns of an auxiliary winding is 5 turns, the reverse breakdown voltage of a rectifier diode is 193.4V, and the maximum on current is 1.37A.
  6. 6. The intelligent driving and dimming system for the plant growth full-spectrum LED according to claim 1, wherein the UCS512G6 control chip outputs 5 paths of independent PWM signals, each path of duty ratio adjusting range is 0.1-100%, the current adjusting range corresponds to the rated current of an LED lamp bead current, a gamma correction module is arranged in the chip and the correction coefficient is 2.2, 256 gray scales are converted into 65536 gray scales, an ADC interface of an STM32F103 main chip is configured into a continuous conversion mode, conversion results are aligned right, and sampling time is 1 mu s.
  7. 7. The intelligent driving and dimming system for the full-spectrum LED for plant growth according to claim 6 is characterized in that the UCS512G6 control chip is compatible with a DMX512 protocol, interacts with a handheld addressing device through an RS485 bus transceiver, has a data transmission rate of 250kb/s, the handheld addressing device adopts a 4.3 inch resistance type touch liquid crystal screen, supports 1512 channel parameter setting, adjusts the brightness of LED lamp beads through inputting a self-checking parameter value 0255, and the relation curve of the self-checking parameter value and the current of single LED lamp beads is characterized by a power function.
  8. 8. The intelligent driving and dimming system for a full-spectrum LED for plant growth according to claim 1, wherein the spectrum fitting algorithm is based on a nonlinear regression least square method, and a non-negative least square solution is solved through lsqnonneg functions of MATLAB and is used for matching target spectrums of a plant growth seedling stage and a plant growth stage.
  9. 9. The intelligent driving and dimming system for a plant growth full-spectrum LED according to claim 1, wherein the light-equalizing control algorithm establishes a mathematical model of LED current and illuminance based on a lambertian equation and an improved Shokrey equation, and the lambertian equation is that And is also provided with The value is determined based on the fitting of the experimental data of the luminous characteristics of the LED, and the test proves that the matching degree of the model and the actual illumination distribution is optimal when n=2, and the improved Shore equation is that And goodness of fit And the homogenization control of the illumination of the receiving surface and the PPFD is realized by adjusting the PWM duty ratio of each LED branch.
  10. 10. The intelligent driving and dimming system for the full-spectrum LED for plant growth according to claim 1 is characterized in that an illuminance sensor of the sensing module is of a type of RS-GZ-N01-2, the measuring range is 0-200000 Lux, the sensor is communicated with a STM32F103 main chip through a Modbus-RTU protocol, the communication distance is not less than 2000 m, the plant physiological parameter acquisition unit detects photosynthetic pigment content through an ethanol extraction method, the detection wavelengths are 665nm, 649nm and 470nm, and fresh weight and dry weight of overground parts of plants are measured through an electronic balance.

Description

Plant growth full spectrum LED intelligent driving and dimming system Technical Field The invention relates to the technical field of plant illumination, in particular to a plant growth full-spectrum LED intelligent driving and dimming system. Background The plant factory is used as a high-grade form of facility agriculture, and high-efficiency and high-quality production of crops is realized by manually regulating and controlling environmental parameters such as illumination, temperature and humidity, water fertilizer and the like, the LED light source has become core illumination equipment of the plant factory due to the advantages of adjustable spectrum, high light efficiency, long service life, low heat and the like, and however, the existing plant illumination LED system still has three core technical defects: 1. The traditional LED array mostly adopts uniform layout, so that the receiving surface is bright in the center and dark in the periphery, and the plant growth consistency is poor; 2. The spectrum regulation and control precision is low, the existing system has insufficient spectrum fitting degree and cannot accurately match the light quality requirements of plants in different growth stages, the spectrum regulation is mostly switched in a fixed mode, the dynamic adaptation capability based on plant physiological feedback is lacking, and the differentiated spectrum requirements of seedling stage and growth stage in the crop breeding process are difficult to meet; 3. The driving power supply has poor performance, low power factor, serious harmonic pollution and insufficient electric energy utilization rate, the driving framework is mostly single-stage conversion, the conversion efficiency is low, the energy consumption requirement of long-term stable operation of a plant factory cannot be met, and the efficient collaborative design with an intelligent dimming system is lacking; Therefore, the intelligent driving and dimming system for the full-spectrum LED for plant growth is provided. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a plant growth full-spectrum LED intelligent driving and dimming system, which has the advantages of illumination uniformity improvement, spectrum accurate regulation and control, efficient driving cooperation and the like, and solves the problems of insufficient illumination uniformity, low spectrum regulation and control accuracy, poor driving power supply performance and the like of the existing plant illumination LED system. (II) technical scheme In order to achieve the aims of improving illumination uniformity, accurately regulating and controlling spectrum and efficiently driving and cooperating, the invention provides the technical scheme that the intelligent driving and dimming system for the plant growth full-spectrum LED comprises a full-spectrum LED array module, a driving module, a control module, a sensing module and a feedback regulating and controlling module; the full-spectrum LED array module comprises five LED lamp beads which cover ultraviolet A wave bands, blue light, red light, far-red light and white light spectral ranges and adopts non-uniform layout design; The driving module adopts a two-stage architecture of a front-stage active PFC circuit and a rear-stage half-bridge LLC resonant converter, wherein the front stage is of a Boost topological structure, and the rear stage comprises a resonant inductor, a resonant capacitor and a transformer; the control module takes a UCS512G6 control chip and an STM32F103 main chip as cores to realize a PWM dimming function; The sensing module collects illumination data and plant physiological parameters. The feedback regulation and control module dynamically adjusts the spectrum, the light intensity and the photoperiod according to the sensing data based on a spectrum fitting algorithm and a light homogenizing control algorithm, and realizes the accurate illumination regulation and control of the whole period of plant growth. Preferably, the five LED lamp beads of the full-spectrum LED array module are respectively an ultraviolet A wave band LED with the center wavelength of 395nm, a blue light LED with the center wavelength of 450nm, a red light LED with the center wavelength of 660nm, a far-red light LED with the center wavelength of 730nm and a white light LED with the color temperature of 3000K, the non-uniform layout is obtained by optimizing a MATLAB (matrix laboratory) exhaustion method, the size of a receiving surface is set to be 900mm multiplied by 250mm, and the distance between the receiving surface and the array module is set to be 200mm. Preferably, the 395 nmLEDs are distributed in 1, 3 and 5 rows, each row has 14 total 42, the 450 nmLEDs are distributed in 2 and 5 rows, each row has 14 total 28, the 660 nmLEDs are distributed in 1, 3, 4 and 6 rows, each row has 14 total 56, the 730 nmLEDs are distributed in 2, 4 and 6