【作者】 卢增艺；

【导师】 林维明； 华桂潮；

【作者基本信息】 福州大学 ， 电机与电器， 2004， 硕士

【摘要】 本文通过研究分析近年来多路输出开关电源辅助输出电压调节和提高效率的方案，面对开关电源朝着输出低电压大电流方向发展的趋势，提出多路输出开关电源新的拓扑优化组合模式——有源钳位正激变换器、同步整流技术、磁放大器。本文结合应用有源钳位正激变换器，对有源钳位正激变换器从电路的工作模式到小信号模型建立进行了深入的分析。磁放大器由于具有简单、高效等优点，在多路输出的辅助输出电压控制调节中得到广泛的应用。本文对磁放大器的特性和控制调节工作原理进行详细的分析。随着IC电路的工作电压不断降低，在开关电源中用同步整流管取代半导体二极管成为提高开关变换器效率的主要技术方案，同步整流技术是新一代开关电源主要的关键技术之一。已有的同步整流管驱动电路主要面对多路输出的主输出电路，而应用磁放大器调节的辅助输出电路同步整流管的驱动，现有的方法存在磁放大器调节与同步整流管驱动的失配，降低了开关电源的效率。本文提出了两种新型的驱动方案，实现驱动与磁放大器工作互补匹配工作，提高了开关电源的效率。最后通过实验样机验证了提出方案的理论分析和可行性。更多还原

【Abstract】 Based on the thorough investigation of the post-regulation and efficiency in multiple output switching-mode power supplies, an optimal combination topology for multiple output switching converter is presented in this thesis, which is consisted of forward converter with active clamp (FAC), synchronous rectification(SR) techniques and magnetic amplifier technique (magamp). AC small signal model and the operating principle of Forward converter with active clamp are analyzed in this paper. The superiority of FAC is obtained by comparing three typical kinds of methods of magnetic reset for Forward converters.With the stringent requirement of low output voltage and high output current, semiconductor diode is necessarily replaced by Synchronous Rectifier to minimum voltage drop. Because the existed driving schemes can not drive SRs properly, two novel driving schemes for synchronous rectifiers in magnetic amplifier post regulating circuit are proposed in this paper. The design and analysis of magnetic amplifier is illustrated . Finally, two prototypes of the proposed converters were built and fully tested to verify the theory analysis.更多还原