Design and research of high-power LED driver power supply based on optimized PID algorithm

High-power LED illumination system has high requirements on the LED driver power supply including conversion efficiency, dimming efficiency and constant-currency accuracy. In this paper, the design is on the basis of fly-back LED driver by SSL2101 and makes use of feedback and control theory of control system, hardware works in the closed-loop state, Meanwhile, we adopt genetic algorithm and direct search strategy to optimize PID parameters in the software design, the optimized PID algorithm can control the power better, and closed-loop control in the software is reached. We will achieve precise control of output current and improve the output current stability, load capacity and conversion efficiency of the current source.