A Novel Luminance Adaptive LED Driver Based On Variable Inductor

The evolution of the street lamp light source,from kerosene lamp and incandescent lamp to high pressure sodium lamp,has never stopped.Nowadays,LED lamps are a good choice for street lamps,which are not polluted by environment,low energy consumption and long service life.The selection of LED lights as street lamps will make the street lamps more convenient,intelligent and sustainable.However,in terms of the application of LED in the street lamp field,the advantages of energy conservation and environmental protection are not really realized at this stage,mainly due to the lack of high quality power supply and reasonable control methods.Aiming at the above two problems,this paper studied the driving power and control methods of LED street lamps,designed the corresponding driving power and brightness sensing module,and put forward the corresponding intelligent control technology.And efforts have been made to further promote the application of LED street lighting.1)In view of that problem of drive power supply,the main topology structure of the current LED drive is analyzed and compared in this paper,and then the requirement of broad load dimming illumination is combined in order to summarize the current domestic and overseas related technologies,and analyze the advantages and disadvantages inherent in them.It solve that problem that the LED driver is large in size and low in efficiency and is a breakthrough to realize the high quality multipath of the LED street lamp,so that a variable inductance LED road lamp driving power supply is designed which realize not only the multi-pass homoflow but also high power factor and efficiency,which can be used for pedestrian street and lighting requirements slightly lower area.And the simulation analysis and prototype experiment are carried out.2)Aiming at the problem of LED street lamp control mode,This paper designs the luminance sensing module of infrared pyroelectric module,environmental illumination detection circuit and MCU circuit.In addition,the fuzzy control technology is introduced,and the principle and design process of the fuzzy controller is introduced in detail.A fuzzy controller based on fuzzy control technology is proposed,and the corresponding fuzzy controller based on the brightness measurement is designed.The control strategy of the controller is to adjust the brightness of the street lamp according to the ambient light intensity and the pedestrian.And MATLAB is used to simulate the system model.After the software simulation analysis of LED driver,the prototype is tested and analyzed.The efficiency of the prototype is 92.1%,which fully verified its feasibility.It proved that it had the advantages of excellent flow efficiency,high efficiency and good energy saving effect on the basis of simple structure and small size.In addition,MATLAB simulation results of fuzzy controller show that the intelligent control of LED street lamps using fuzzy control technology is feasible,which can realize real-time adjustment of street lamp brightness according to ambient lighting conditions and pedestrians,and has certain advantages,which can further improve the energy-saving effect of LED street lamps.