LED低压驱动电源——DC/DC降压-升压变换器(上)  

A Type of Low Voltage LED Driver with DC/DC Buck-boost Converters(Ⅰ)

作　　者：陈传虞 

出　　处：《中国照明电器》2011年第9期17-21,共5页China Light & Lighting

摘　　要：详细叙述了DC/DC降压-升压变换器LED驱动电路的演变及工作原理,推导了此类电路输出电压与输入电压的关系,并以占空比D表示;介绍了两种典型芯片及其实际使用中的有关知识。The principle and evolvement of DC/DC buck-boost converters used for LED drivers are described in detail.The relationship between output voltage and input voltage is deduced,expressed with duty ratio.And two typical IC chips and the applied circuits are introduced.

关 键 词：DC/DC降压-升压变换器 连续导通模式(CCM) 断续导通模式(DCM) 占空比隔离电源 

分 类 号：TM46[电气工程—电器]