Discontinuous inductor current in the optimum topology switching converter

Slobodan Cuk
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引用次数: 59

Abstract

It is demonstrated, first, how the complex modular converter structures (such as cascade of the boost and buck converters) can be easily modelled in the discontinuous current mode by use of the state-space averaging method and equivalent circuit approach and by taking advantage of the known properties and circuit models of the individual converter modules (boost and buck converters). Then, the recently introduced new optimum topology switching dc-to-dc converter is analyzed in the discontinuous inductor current mode. Unlike other converters with two inductors (such as cascaded boost-buck), the new converter has a unique feature that both inductor currents become discontinuous at the same instant, and remain so with the same second (decay) interval. Moreover, for the first time, the discontinuity of the inductor current takes place at a nonzero inductor current level, with dc current, passing through both inductors in the remaining third part of the switching period. It is shown how this peculiar behaviour can be successfully modelled and a simple analytic criterion for determination of the boundary between the continuous and discontinuous inductor current mode is obtained.
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最优拓扑开关变换器中电感断续电流
首先,通过使用状态空间平均方法和等效电路方法,并利用单个转换器模块(升压和降压转换器)的已知特性和电路模型,演示了如何在不连续电流模式下轻松建模复杂的模块化转换器结构(例如升压和降压转换器的级联)。然后,分析了电感电流断续模式下新提出的最优拓扑开关dc- dc变换器。与其他带有两个电感(如级联升压)的变换器不同,这种新型变换器有一个独特的特点,即两个电感电流在同一瞬间不连续,并在相同的秒(衰减)间隔内保持不连续。此外,第一次,电感电流的不连续发生在非零电感电流水平上,直流电流在开关周期的剩余三分之一部分通过两个电感。本文说明了如何成功地模拟这种特殊的行为,并得到了确定连续和不连续电感电流模式边界的简单解析准则。
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