交流直接驱动的可调光大功率LED照明系统的设计

摘要

采用市电直接给LED供电方式是LED驱动电源发展的大方向。设计了一种无电解电容和变压器的交流直接驱动的LED照明系统，并能够进行PWM调光。分析了基于交流直接驱动的分段式驱动LED电路的原理，以及PWM调光电路的设计。实验结果表明该驱动电源具有良好的调光性能，低THD值和高功率因数的特点，具有一定的应用价值。%Driving LED chip by alternating current is the direction of the LED power supply development . The LED lighting system is designed in the paper. The LED lighting system with PWM dimming is directly driven by Power Frequency AC, and it is not driven by electrolytic capacitor or transformer. The Analysis of the principle of sectional LED circuit directly driven by AC and the design of PWM dimming circuit are introduced. The experimental results show that, the LED lighting system has good dimming performance, and the characteristics of low THD value and high power factor have certain application value.