毕业设计（论文）-白光LED灯驱动电路设计.doc

毕业设计（论文）-白光LED灯驱动电路设计.doc白光LED灯驱动电路设计
摘要
对于一般照明而言,人们更需要白色的光源。作为一种新型的光源,白光LED更具有无污染、长寿命、耐震动和抗冲击的鲜明特点。虽然白光LED的发光效率正逐步提高,但是LED灯配套的驱动器性能不佳,故障率高,成为了LED推广应用的瓶颈。本文介绍了一种照明用LED高效驱动电路的设计方法。本设计采用单独的驱动电路。通过脉宽调制方式来调节LED灯的亮度;采用开关电源供电方式,输入电压范围广、抗干扰性好、驱动效率高,保证了该驱动板在不同场合、不同区域都能正常使用。
关键词: LED; 照明; 高效; 驱动
White LED lamp driver circuit design
Abstract
For general lighting, people need more white light sources. As a new light source, white LED with pollution-free, long-life, vibration and shock resistant to the distinct characteristics. At present, the luminous efficiency white LED is gradually improving, mercialization of the device has reached the level of the incandescent lamp, but the fact should not be overlooked that the LED lights and supporting, the driver did not keep up with a timely manner, the drive circuit poor performance, fault Rate is high and promote the use of LED e the bottleneck, there are many technical issues need to study and paper introduces a kind of LED lighting efficiently driving circuit design method. This design USES the separate drivers circuit. Through the pulse width modulation way to adjust LED lamp brightness, Using power switch mode, the input voltage range, anti-jamming good, driving with high efficiency, guarantee the driven plate in different situations, different regions can normal use.
Keywords: LED; Lighting; High-efficiency; Driver
目录
摘要…………………………………………………………………………………………………………..1
引言……………………………………………………………………………………………………………..3
第一章绪论…………………………………………………………………………………………………..4
LED的结构以及发光原理 4
LED用途介绍 4
白光LED灯的特点 6
白光LED灯的优点 6
白光LED灯的缺点 6
我国白光LED发展前景 6
第二章白光LED灯驱动电源………………………………………………………………………………….8
LED驱动电源要求 8
LED电源的分类 8
恒流驱动的理由 9
第三章 LED驱动器…………………………………………………………………………………………..12
白光LED驱动器的要求 12
驱动器的分类 12
恒流源 13
电荷泵 13
开关电源 14
驱动电源效率 15
第四章 LED驱动电路设计…………………………………………………………………………………..17
芯片LM3402/LM3402HV电路性能………………………………………………………………..17
PWM调光…………………………………………………………