Analysis and control of a single switch wider step‐down gain DC–DC converter for low‐voltage applications,International Journal of Circuit Theory and Applications

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Analysis and control of a single switch wider step‐down gain DC–DC converter for low‐voltage applications
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-08-06 , DOI: 10.1002/cta.2855
Shrikant Misal ₁ , Mummadi Veerachary ₁

Affiliation

This paper presents a point‐of‐load transformerless DC–DC converter having a wider step‐down conversion ratio. In comparison with quadratic/stacked buck converter variants, the presented topology exhibits nonpulsating source current, more effective switch utilization at small voltage gains, and reduced current stress on components. Its comprehensive steady‐state analysis is carried out under continuous and discontinuous modes of inductor currents, and design criteria to select L‐C components are established. State variable dependency feature in the topology, imposing a reduced fourth‐order dynamics, is discussed and subsequently verified from its average model. A fixed frequency sliding mode controller is then designed with a step‐by‐step evaluation of sliding surface existence, reachability, and stability conditions. The equivalent control law devised in this scheme is duly constituted from source side inductor current dynamics and load voltage error information, so it facilitates simple realization as well as better transient response. Remarkable operational characteristics of the presented converter are studied analytically and demonstrated with experimental observations on a laboratory prototype.

中文翻译：

用于低压应用的单开关宽降压增益DC-DC转换器的分析和控制

本文提出了一种具有更宽降压转换比的负载点无变压器DC-DC转换器。与二次/堆叠降压转换器的变型相比，本文提出的拓扑具有无脉动的源电流，在小电压增益下更有效的开关利用率以及减小的组件电流应力。它在电感器电流的连续和不连续模式下进行了全面的稳态分析，并建立了选择LC元件的设计标准。讨论了拓扑中的状态变量相关性特征，并降低了四阶动力学，随后从其平均模型中对其进行了验证。然后设计固定频率滑模控制器，并逐步评估滑移面的存在性，可达性和稳定性条件。该方案设计的等效控制律是由源极侧电感器电流动态特性和负载电压误差信息适当构成的，因此它不仅易于实现，而且具有更好的瞬态响应。通过分析研究了提出的转换器的卓越的工作特性，并在实验室原型上通过实验观察得到了证明。

更新日期：2020-08-06

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