Research And Design Of Self-adjusting Driving Power Supply For High Power LED Lamp

LED lamps are made by using light-emitting diodes as light sources.They are characterized by high efficiency,energy saving,long life and easy maintenance.Therefore,LED lamps are widely used in classroom lighting and other occasions,and have gradually replaced incandescent lamps,fluorescent lamps and other technology light sources.For classroom lighting requirements,this paper based on the technical specification for primary and secondary school classroom lighting T/JYBZ005-2018,study and design a model can according to the ambient light adaptivly adjust the brightness of LED lamps and lanterns and maintain a constant ambient light,high power LED drive power supply.The design put intelligent dimming technology into LED drive power supply,keep the LED lighting area environment light constant.The experiment shows that the drive power can control up to 6 groups of LED lamps and lanterns,six different independent area light while maintaining a constant.This driving power supply can effectively improve the life of LED lamps and improve the comfort of the lighting light,which has certain practical application significance for improving the lighting environment of school classrooms and reducing the incidence of myopia among students.Firstly,the paper analysis the characteristics of the LED,power supply topology structure,control strategy and adaptive adjustment principle etc,it determines the LED drive power supply adopts the active power factor correction circuit,the topological structure of voltage regulator circuit adopts double positive excitation,regulating circuit control strategy is adopted by double loop control method with the original current protection and fuzzy adaptive PID algorithm.Secondly,it designs the voltage stabilizing circuit of LED drive power supply,the adaptive dimming circuit,and the circuit of luminance detection module.The control circuit uses STM32 main control chip and peripheral auxiliary circuit.The voltage regulator circuit includes input circuit,positive shock circuit and signal acquisition circuit.The multi-channel adaptive dimming and illuminance detection module circuit is realized by BH1750FVI illuminance detection sensor and LM3464 multi-channel dimming chip.Then it compile LED driver power program,LED driver power host program including voltage regulator circuit program and adaptive dimming program,lighting module detection program including lighting detection program and serial port transceiver program.At last,the LED drive power is simulated and compared by Multisim and Simulink simulation tools,and the results are tested by building the experimental prototype.The test results show that the designed hardware and software systems are correct,and the LED drive power supply can adapt to the output according to the environmental illumination,so as to realize the environmental illumination stability.