基于恒流二极管的小功率LED驱动电路设计

THE DESIGN OF LOW POWER LED DRIVER BASED ON CURRENT REGULATIVE DIODE

提出一种基于恒流二极管的电容降压式小功率LED驱动电路设计方案,由交流市电供电,输出低压恒流,只需调整电路中部分元件参数即可恒流驱动不同功率LED灯组。这种设计方案在传统电容降压驱动电路基础上引入了恒流二极管,保证了驱动源低压恒流输出。负载小功率LED采用交叉阵列方式连接,降低了灭灯率。

We propose the design of a capacitance buck, low-power LED driver circuit based on current regulative diode. It is powered with AC power and output low voltage and constant current. Simply adjust the component parameters of parts, the circuit can drive LED array of different power with constant current. In this design, we bring in current regulative diode based on traditional capacitance buck driver circuit to ensure that driving source output low voltage and constant current. Furthermore, we connect low power load LED with cross-array mode, decreasing the light off rate.