照明LED驱动电源的设计-毕业论文.doc

职业技术学院 毕 业 论 文 题目： 照明LED驱动电源的设 照明LED驱动电源的设计 摘 要 随着电力电子技术的发展，LED由于环保、寿命长、光电效率高等众多优点，近年来在各行业应用得以快速发展，同时，由于近年来的开关电源在电子电器各行业中占了非常重要的位置，由此驱动LED的开关电源就成了关注热点。 理论上，LED的使用寿命在10万小时以上，但在实际应用过程中，由于驱动电源的设计及驱动方式选择不当，使LED极易损坏。我们设计LED驱动电源时，有必要知道LED电流、电压特性，由于LED的生产厂家及LED规格不同，电流、电压特性均有差异。因此对驱动电源的设计提出了严格要求。根据LED电流、电压变化特点，采用恒流驱动方式，是比较理想的LED驱动方式，它能避免LED正向电压的改变而引起电流变动，同时恒定的电流使LED的亮度稳定。因此众多厂家选用恒流方式驱动LED，从而设计的开关电源就需要一个能恒流的直流驱动电源。传统的开关电源控制集成电路具有效率高、输出稳定、可靠性高，并可实现远程控制等功能。完全适合用来驱动LED的开关电源。 本文主要通过设计一个恒流驱动电源来驱动LED。通过各种电力电子组件和电力电子电路组成一个恒流的电源，达到设计的要求。 ：LED驱动电路开关电源，恒流 esign of LED Lighting Drive Power Abstract With the power of the development of electronic technology, LED because of environmental, long life, high efficiency photoelectric many advantages, In recent years in all sectors to rapid application development, while In recent years, the switching power supply in electrical and electronic industries accounted for a very important position. This drives the LED Switching Power Supply concerns have become hot focus. Theoretically, the service life of the LED 100,000 hours or more, but in actual application process, As the power supply design-driven approach and a poor choice, LED easily damaged. We designed LED drive power, it is necessary to know LED current and voltage characteristics. Since the LED and LED manufacturers specifications, current and voltage characteristics are different. So right drive power on the design of the strict requirements. Under the LED current and voltage characteristics, constant-current-driven approach is ideal LED driver, It would avoid the LED forward voltage changes caused changes in the current, constant current so that the LED brightness stability. So many manufacturers use constant current mode LED driver, thus the design of switching power supply will need a constant current of the DC power supply. Traditional SMPS control IC with h