用反激式功率变换器驱动LED的电路(上)  

A Type of LED Driver with Flyback Converter(Ⅰ)

作　　者：陈传虞 

出　　处：《中国照明电器》2011年第11期18-21,共4页China Light & Lighting

摘　　要：介绍用反激式功率变换器驱动LED的电路,对电路的工作原理进行详细分析,推导出其电压、电流的关系;介绍了一种常用于反激式功率变换器的芯片,给出由其构成的75W LED驱动器电路,详细说明了制作该驱动器时应注意的事项。This article describes a type of LED drivering circuit with flyback converter,gives the detailed analysis of the electrical circuit,and derives the formulas of voltages and currents.It also introduces an IC chip which is widely used in flyback converters,presents a type of 75W LED driver circuit with this chip,and indicates the points of fabricating the driver.

关 键 词：反激式变换器 反馈环路 占空比 隔离电源 频率抖动 变压器绕组 

分 类 号：TM923.34[电气工程—电力电子与电力传动] TM46