Research On LED Street Light Driver Based On LCL Resonance

With the rapid socio-economic development,energy shortage and environmental pollution are worsening day by day.Developing and using new energy sources is the most effective way to protect the environment and ease the energy crisis.Among all the renewable energies,solar energy attracts much attention due to its advantages of being safe and reliable,being green and pollution-free,and solar power generation is an important form of developing "green energy".Compared with the traditional lighting source,LED light source has the advantages of small size,high efficiency and energy saving,long life,light weight and environmental protection.It has been widely used in high-power lighting applications such as street lamps and tunnels.Therefore,the study of solar LED green lighting system is of great significance.Firstly,this paper summarized the research background and development of solar LED street lamp drive power supply,introduced the working theory and feature of solar battery and lead-acid batteries,and the most frequently used solar cell maximum power tracking algorithm.Secondly,based on the analysis of the composition and principle of the existing solar LED street lamp drive power supply,a scheme of LED street lamp drive power supply combining the staggered Boost full bridge converter and the LCL constant current resonant network is introduced.The scheme is introduced in detail The circuit structure,working process and ZVS soft-switching characteristics,derived power switch ZVS soft-switching conditions.According to the working requirements of LED street lamp drive power supply,a hybrid control strategy based on PWM control and phase shift control is proposed to realize the function of battery intelligent charge and discharge:under the charge mode,the maximum power tracking of the solar cell is realized by PWM control,Of the three stages of intelligent charging;power supply mode,through the combination of PWM control and phase-shift control to achieve constant output current control and LED lamp dimming function.In order to improve the utilization of solar cells,battery charging efficiency and extend the battery life,the use of dsPIC single-chip maximum solar power point tracking,battery charge-discharge control strategy combined together achieved the LED street lamp lighting system energy management and control.Finally,The whole running status of street lamp system was verified by Saber software,and developed a solar LED street lamp driving power experimental prototype based on LCL constant current resonant network,The prototype is tested by experiments,The experimental results verify that the proposed scheme is feasible.