一款小功率基于原边控制技术的反激式LED恒流驱动电路

Constant current LED driver based on flyback structure with primary side control

文中设计了一款额定功率为3W的反激式LED恒流驱动电路,利用原边控制技术,去除了隔离光耦与二次侧辅助调整电路,解决了传统电路电源布局要求高,体积大的问题。文中分析了电路实现恒流与恒压的原理,并介绍了电路元件参数。当输入电压在60～260 VAC下变动时输出电流精度为6.4%。实验结果表明该电路具有结构简单、高恒流精度以及高稳定性的优点。

The design of a 3 W constant current LED driver based on flyback structure with primary side control technology is proposed, which eliminates the opto-isolated feedback and secondary regulation circuits which are required in conventional designs. The principle of constant current and constant voltage of the circuit is analyzed, and parameters of the circuit are introduced. The constant current accuracy of the circuit under 60-260 V AC input voltage is 6.4%. The experimental results show that the circuit has the advantages of simple structure, high constant current precision and high stability.