摘要
采用PWM型DC-DC降压拓扑电路结构和闭环恒流控制,设计了LED驱动电路,其工作在CCM模式。该LED驱动电路选用LM2575作为PWM控制芯片,并制作了该电路的实际电路板,其外围元件较少,电路结构简单,适用于中小型LED负载驱动。通过理论分析得到电路元件和各个节点的性能参数,并应用Simulink对DC-DC降压拓扑电路进行仿真。经调试与测量表明,该电路的电气性能良好,负载输出电压纹波在±0.1%以内,功率效率达到45.5%。
The DC-DC PWM buck topology and closed-loop constant current control are adopted, and the LED driver circuit operating in the CCM mode is designed with LM2575 as the PWM control chip. The actual circuit board is fabricated with less peripheral components and simple structure, suitable for medium and small LED load drive. The performance parameters of the circuit elements and each node are obtained by theoretical analysis, and the DC-DC buck topology is simulated by Simulink. Measurement after debugging shows that the electric has good performance with a load output voltage ripple within 0. 1% and power efficiency up to 45.5%.
出处
《电子科技》
2015年第8期36-38,42,共4页
Electronic Science and Technology
基金
海南大学校基金资助项目(Hyk-1515)
