适用于高压输入低压输出的两级式变换器

超大规模集成电路的飞速发展给其供电器提出了越来越高的要求,传统的变换器不再能够满足这些要求.为此,该文提出了一种隔离式变换器和非隔离式变换器相结合两级式结构.该结构解决了传统变换器在此类模块设计中遇到的占空比失控、变压器绕组之间耦合欠佳等问题,尤其适合于高功率密度、高可靠性的低压大电流输出的小功率模块.该文在分析了这种变换器的稳定性基础上,采用该拓扑结构试制了一台33-75V输入、5V/10A输出的原理样机,给出了实验结果.

TWO-STAGE CONVERTER APPLICABLE TO HIGH VOLTAGE INPUT LOW VOLTAGE OUTPUT CASE

Fast development of very large scale integration(VLSI)arises stringent requirements for its power supplies,and the traditional converters can no more meet these.To meet the increasing demands of wide line range and low voltage high current output power modules,a two-stage converter composed of a traditional isolated converter and a non-isolated one is proposed in this paper.This two-stage converter can avoid these problems such as the awful coupling of the windings of the transformer and the uncontrolled duty ratio often come up against in traditional converter design.It is suitable for high power density,high reliability and low power with low voltage and high current output modules.The stability of this two-stage converter is analyzed,and a prototype with 33 to 75V input and 5V/10A output is built to verify the analysis.Finally,the results are given based on the experiments.