直流LED光源驱动电路的选择与应用

摘要

LED as the twenty-first century green lighting source has been widely concerned,its luminous principle is different from the traditional light source,DC LED using DC drive light,the traditional light source is AC drive light,if the LED driver circuit fails,then the LED light source cannot be normal light,therefore,the driving circuit of the DC LED light source is of vital importance to the overall life of the lamp.This paper first describes the principle of LED light source and LED volt-ampere characteristics,on the low voltage,weak current drive circuit described,explain the difference between constant voltage drive and constant current drive,analysis of several common LED light source drive circuit,introduce the selection and application of several driving circuits on different kinds of light sources.In conclusion,suitable and reasonable drive circuit, the cost of LED light source,life is a very important part.%LED作为二十一世纪的绿色照明光源而被广泛关注,其发光原理不同于传统光源,直流LED采用直流驱动发光,而传统光源是交流驱动发光,如果LED驱动电路出现故障,那么LED光源也就无法正常发光,因此直流LED光源的驱动电路对其灯具整体寿命至关重要.本文首先阐述LED光源的发光原理及LED的伏安特性,就低压、弱电流的驱动电路进行描述,解释恒压驱动和恒流驱动的区别,分析常见的几种LED光源的驱动电路,介绍几种驱动电路在不同种类光源上的选择及应用.