超快速加载Buck变换器设计

Design of Ultra Fast Step-up Buck Converter

为了提高VRM的加载响应速度,该文分析了传统Buck变换器的最优加载过程,并基于传统Buck变换器提出了双输入Buck变换器电路方案,说明了其稳态工作过程和加载运行过程,以最优加载阈值为依据给出了附加电源的切换条件,并做了仿真对比研究.仿真和试验结果表明双输入Buck变换器较传统Buck变换器具有更快加载响应速度和更小输出电压跌落,且结构简单,易于设计和实现,适用于VRM主电路.

To improve the VRM＇s step-up response speed,the optimal loading of a traditional buck converter was analyzed,based on that the dual-input buck converter was proposed,then its steady work process and the optimal loading operation process was described.The additional power switching conditions were given by the optimal loading threshold.Finally,the comparative simulation study was carried out for both.The simulation and experimental results show that the dual input buck converter is faster response speed and smaller output voltage drop amount than the traditional buck converter,and the simple structure,easy to design and implement,suitable as the VRM main circuit.