摘要
设计了一种市电直接供电的白光LED的恒流驱动电路。该电路的特点是,利用单端反激式DC/DC变换电路和特定的反馈电路构成闭环,将大动态范围变化的输入电压稳定在某一特定值(25V);通过在LED各并联支路加入恒流源,使得不同支路的LED的发光亮度保持完全一致。
A constant-current white LED drive circuit which is powered by AC/220V directly is presened. The circuit is characterized by using single-ended flybaek DC/DC converter circuit and specific closed-loop feedback circuit to stabilize the input voltage that changed in a large dynamic scope at a given value（25V）; Through inserting constant current source in every LED parallel branch, the LEDs in different branches achieve the same brightness completely.
出处
《电源技术应用》
2007年第11期17-20,共4页
Power Supply Technologles and Applications
关键词
LED光源
驱动电路
恒流
稳压
LED light source
drive circuit
constant current
stable voltage
