新型同步整流驱动方式在开关电源中的应用  

Application of a new Methods to Drive Synchronous Rectifier in Switching Power Supply

作　　者：张乾[1] 王卫国[1] 

机构地区：[1]兰州物理研究所,甘肃兰州730000

出　　处：《电力电子技术》2009年第2期73-75,共3页Power Electronics

摘　　要：介绍了一种新型外驱动技术在开关电源中的应用研究,该技术以IR1176作为控制芯片来驱动同步整流MOSFET。重点分析了同步整流电路的工作原理,并给出了相关设计公式。该驱动方式延长了续流MOSFET的导通时间,可将带隔离变压器的单开关正向变换同步整流电源的效率提高到90%。在实际应用中该驱动方式可确保主开关管去掉散热器之后仍能正常运行,使装置重量降低、体积减小,有利于推广利用。An application research of a new drive method for synchronous rectifiers in switching mode power supply is introduced,IR1176 acts as a control chip to drive synchronous rectifiers MOSFETs.The operation principle of syn-chronous rectification circuit is particularly analyzed, and the design formulate of power supply is also given.This new method extends MOSFET＇s on time and then improve the efficiency of the single-switching forward conversion syn-chronous rectifiers with isolating transformer to 90%.In practical applications it is possible to remove heat sinks from the switching power devices because of the power loss reduction, and to make the rectifiers more compact.

关 键 词：电源 变压器/外驱动 同步整流 

分 类 号：TN86[电子电信—信息与通信工程]