Optimization and Design of a 48-to-12 V, 35 A Split-Phase Dickson Switched-Capacitor Converter

Richard Yue Sun, Samuel Webb, Yanfei Liu, P. Sen
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引用次数: 1

Abstract

The switched-capacitor converter (SCC) topology has been gaining attention in recent years because of their advantages of higher power density, switch utilization, and reduced component stress compared to existing converter topologies. However, SCCs have a major drawback in which capacitor charge redistribution results in significant current spikes. One method of addressing charge redistribution is split-phase operation, which accomplishes this by imposing voltage control on the SCC’s flying capacitors. However, an important design consideration was identified regarding the implementation of the split-phase Dickson SCC in high-current applications. Mismatched flying capacitors exhibit uneven charge rates, resulting in incomplete elimination of charge redistribution by split-phase control. This paper presents a discussion of the effects of mismatched flying capacitors on the operation of the split-phase Dickson SCC. Furthermore, design processes and test results of a prototype high-current split-phase Dickson SCC will be presented.
48 ~ 12v, 35a分相Dickson开关电容变换器的优化设计
与现有的变换器拓扑结构相比,开关电容变换器(SCC)拓扑结构具有更高的功率密度、开关利用率和更小的元件应力等优点,近年来受到越来越多的关注。然而,SCCs有一个主要缺点,即电容器电荷重新分配会导致显著的电流尖峰。解决电荷再分配的一种方法是分相操作,它通过对SCC的飞行电容器施加电压控制来实现这一目标。然而,对于在大电流应用中实现分相Dickson SCC,需要考虑一个重要的设计因素。不匹配的飞行电容器表现出不均匀的电荷率,导致分相控制不能完全消除电荷再分配。本文讨论了飞行电容失配对分相迪克森SCC运行的影响。此外,还将介绍大电流分相Dickson SCC原型的设计过程和测试结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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