摘 要:在这个推行绿色环保节能的时代中,LED照明灯发展迅速,在各行各业中得到了广泛的应用。LED具有节能,长寿,光电效率高等众多优点,这使得LED已然成为照明领域的主流,同时由于以开关电源为代表的电力电子器件给工业生产和社会生活带来了巨大的进步,因此,驱动LED的开关电源成为了我们关注的热点。论文设计的LED驱动电路包括EMI滤波电路、桥式全波整流电路、反激式DC/DC变换器以及PWM控制电路,并通过Multisim软件搭建仿真模型,仿真结果表明该设计满足LED驱动电路的设计要求。65388
毕业论文关键词: 开关电源,LED驱动电路,恒流,PWM
Abstract:In the era of green environmental protection and energy conservation which has been carried out, the LED lightings’ development has been rapid. LED has been widely used in all aspects of life. It had the advantages of energy saving, long life, and high efficiency, which made it become the mainstream lighting in the future .And the electronic device with switching power supply has been the representative of the tremendous progress in the industrial production and social life, therefore, the switching power supply which drove the LED has become the focus of our attention. The design of LED drive circuit was made up of EMI filter circuit, bridge type full wave rectifier circuit, flyback DC/DC converter and PWM control circuit. The simulation model was built by the Multisim software, and the simulation results showed that the design met the requirements of the LED driver circuit.
Keywords: LED power supply, Constant current, PWM
目 录
1 绪论 4
1.1 LED的发展历程 4
1.2 LED技术的国内外进展与应用前景 5
1.3 LED的结构与特性 5
2 LED驱动方式及特点 7
2.1 电容降压式LED驱动电路 8
2.2 开关式稳压电源驱动电路 9
3 恒流LED驱动电源 14
3.1 系统设计构成框图 14
3.2 UC3842的性能 15
3.3 电路参数设置 17
4 系统设计与仿真 18
4.1 系统硬件设计 18
4.2 总体电路图与仿真 21
结论 25
参考文献 26
致谢 27
1 绪论
在全球能源短缺的忧虑再度高升的前提下,节约能源是人类一直关注的话题,在照明的范畴中,LED照明灯具等的使用正不断地吸引着我们,它必然是未来发展的趋向,21世纪已然步入一个新型照明电路时期,其就是以LED为主要代表的[3]。就目前而言,我们如果想要充分发挥LED的节能与高亮度的特点,则需要不断提高其驱动电源的效率。并且由于开关工作频率比较高,所以整个LED驱动电源更易装在紧凑的LED灯具中。所以如果在大量运用LED时,我们想要保证LED的光亮度是一致的,就需要高恒流精度。论文网
1.1 LED的发展历程
1.2 LED技术的国内外进展与应用前景
1.3 LED的结构与特性
1.3.1 LED结构