Research And Design Of Numerical Control Driving Power Supply For High-power LED In Tunnel

Highway tunnels require a lot of lighting equipment.How to save electricity while ensuring traffic safety has become a hot spot for traffic managers.LED lighting has been widely used in industry and daily life due to its characteristics of energy-saving,environmental protection,long service life,and easy maintenance.Especially in road tunnels such as high lighting consumption of places have a high promotional value.LED power supply is a key link in LED lighting engineering,and it is of great value to study and improve it.The power utilization efficiency of LED driving circuit directly affects the cost of tunnel lighting.The purpose of this thesis is to study and design a tunnel high-power LED digital control driving power supply with high efficiency,energy-saving and intelligent dimming for the requirements of high-efficiency lighting in highway tunnels.The three-level circuit structure can effectively improve the utilization efficiency of electric energy,and realize digital and intelligent control of the power supply.Contents of this thesis are as follows:1)Active Power Factor Correction Circuit Research and DesignFor the active power factor correction circuit,studying the comparative power factor correction strategy,select the single-cycle Boost converter active power factor correction scheme,the working mode adopts continuous conductivity mode,the average value of the switch variables in each switching cycle is strictly equal to or proportional to the control reference amount,effectively solve the tunnel disturbance problem.The active power factor correction circuit is based on the IR1155 chip,and the power factor reaches 0.95 by simulation verification and actual testing of the circuit.2)LLC Resonant Conversion Circuit Research and DesignIn this part,the study is to understand various DC-DC conversion circuits firstly.LLC resonant conversion circuit is selected as the final scheme.Then,the equivalent circuit framework of the LLC conversion circuit is established by the fundamental wave analysis method,and the related circuit parameters are calculated in detail.With the series-parallel model and fuzzy PI algorithm,the double closed-loop control model of voltage loop and current loop is constructed and verified by simulation.The design scheme of LLC resonance transformation is feasible,showed by the simulation experiment.Finally,the hardware circuit of LLC resonant conversion is designed with STM32 as the controller,and the stable output of 24 V DC is realized.3)Constant Current Drive and Wireless Communication Circuit DesignBy analyzing the constant current driving scheme,the constant current driving scheme with STM32 as the controller and XL4015 as the core is selected to provide a constant and balanced input current for the LED array.At the same time,Zig Bee technology is used to establish a wireless communication system for two-way transmission of power supply information,human-computer interaction,and intelligent control of driving power supply.Finally,the design scheme is verified by designing hardware objects.Firstly,the physical objects of each part are tested and analyzed.And the results show that each part of the circuit can meet the performance index respectively.Then,all parts are connected in sequence for system joint debugging.The joint debugging results show that the NC power supply designed in this subject meets the functions and technical indexes of the task as a whole.