单端反激有源钳位和同步整流技术研究

摘要

The active clamp techniques is usually used in the forwad topology of DC/DC power supply. Study of active clamp and synchronous rectifying techniques in single out of flyback topology is introduced. By means of principle,de-signing of active clamp and synchronous rectifying techniques apply to single out of flyback topology, mixed assembling techniques of thick flim and modules to achieve the purpose of high efficiency and high power density. By the 5 V/20 W power sample machining and simulation testing,power density of the power sample is 50.8 W/inch3, power efficiency of the power sample is 89.2%,nose ripple of the power sample is 43 mV. The power sample proves that this techniques is efficient apptoaches to increase the power density of isolation DC/DC power supply.%有源钳位技术通常只在正激DC/DC功率电源拓扑结构中。现介绍有源钳位和同步整流技术在反激拓扑结构中的应用及研究。通过有源钳位和同步整流应用到反激式拓扑中的原理设计技术,以及厚膜和模块立体混装技术,以达到电源高效率和高功率密度的目的。通过5 V/20 W电源样品设计和组装以及模拟试验,电源样品功率密度达50.8 W/inch3,效率为89.2%,纹波为43 mV。试验样品证明反激式有源钳位和同步整流技术是提高中小功率隔离电源功率密度的最有效技术途径。