高功率因数低空载损耗AC/DC电源的研究  

Stady on AC/DC Converter with Low Stand-by Loss and High Power Factor

作　　者：滕妨华[1] 张仲超[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电源技术应用》2003年第3期28-30,共3页Power Supply Technologles and Applications

摘　　要：介绍了一种宽输入、低空载损耗的90W AC/DC电源电路由两级组成:以L6561为核心的功率因数校正(PFC);以L5991A为核心的DC/DC反激变换器它的主要优点是轻栽时通过L5991A的变频功能降低开关工作频率,减小开关损耗,并通过外部电路的设计关掉L6561的PFC功能,从而达到轻载时减少电路的功率损耗的目的实验表明在空载时。A 90 W low stand-by loss AC/DC converter with universal input voltage is introduced. The converter consists ot two-stages approach: a front-end PFC pre-regulator based on L6561 PFC controller and back-end DC/DC converter in flyback topology based on L5991A PWM controller. The stand-by function of the L5991 A. which reduces the switching frequency of the DC/DC converter at light load, is also used to turn off the PFC stage to meet the needs of the severe no-load consumption. Experiment results show that the total no-load input power is less than IW.

关 键 词：空载损耗 高功率因数 AC/DC电源 功率因数校正 

分 类 号：TM91[电气工程—电力电子与电力传动] TN86[电子电信—信息与通信工程]