正激式变换器轻载条件下的同步整流分析

华南理工大学学报(自然科学版) ›› 2003, Vol. 31 ›› Issue (1): 60-64.

正激式变换器轻载条件下的同步整流分析

谢运祥王浩

华南理工大学电力学院广东广州510640

出版日期:2003-01-20 发布日期:2022-04-07
通信作者: 谢运祥（1965－）男博士教授主要从事电力电子技术的研究．
作者简介:谢运祥（1965－）男博士教授主要从事电力电子技术的研究．

Synchronous Rectifier Analysis of Forward Converter under the Condition of Light Load

Xie Yun-xiang Wang Hao

College of Electrical Power South China Univ．of Tech．Guangzhou510640China

Online:2003-01-20 Published:2022-04-07
Contact: 谢运祥（1965－）男博士教授主要从事电力电子技术的研究．
About author:谢运祥（1965－）男博士教授主要从事电力电子技术的研究．

摘要/Abstract

摘要： 针对具有同步整流的正激变换电路在轻载条件下因输出滤波电感电流经同步整流 MOSFET 管反向流动而形成环流的现象提出了利用 UC3842检测轻载条件并通过禁止续流 MOSFET 导通来阻止电感反向电流的技术方案理论分析和实验研究证明该方法是可行的并且能明显提高变换器轻载运行时的变换效率．

关键词: 正激变换器, 同步整流, 开关电源

Abstract: While the converter works at light loadthe output filter inductor current will go negative through MOSFET in synchronous rectifier and the circulating current will be formed．In order to solve this problemthe detection method of light load condition of converter used by UC3842is proposed in this papermeanwhilethe technique has also been studied which is used to make the inductor current cannot be flow negatively by switching off the MOSFET while converter works at light load．The theory analysis and experiment have proved that the proposed method is effectthe converter efficiency has also been improved a lot at light load．

Key words: forward converter, synchronous rectifier, switching mode power supply

中图分类号:

TM92

谢运祥王浩. 正激式变换器轻载条件下的同步整流分析[J]. 华南理工大学学报(自然科学版), 2003, 31(1): 60-64.

Xie Yun-xiang Wang Hao. Synchronous Rectifier Analysis of Forward Converter under the Condition of Light Load[J]. Journal of South China University of Technology(Natural Science Edition), 2003, 31(1): 60-64.

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