Nonisolated DC–DC Power Converter Synthesis Using Low-Entropy Equations

Abstract

There is a growing demand for novel nonisolated dc–dc power converters with the deployment of dc power distribution systems integrating renewable sources and energy storing elements. The load and source of these applications have different input and output voltage levels, and it is vital to avoid operating the interfacing power converters at extreme duty ratios. Therefore, engineers and researchers explore the power converter synthesizing techniques since the mid-1970s, fulfilling the above requirement besides the nonpulsating input and output current. Among them, the analytical synthesis method has gained popularity, although it gives rise to high-entropy equations. This article shows a simple yet powerful topology synthesis method based on the low-entropy equations that reveal the connection between the energy storing elements and switches. To this end, a set of design rules have been introduced in this article to realize the voltage-second balance equations obtained by decomposing the voltage gain polynomial using design-oriented analysis. Moreover, different decomposition levels of the gain polynomial have been discussed to embed inductors at either input or output or both ports. Furthermore, the synthesis of multitopology converters using low-entropy equations has been demonstrated. The applicability of the proposed method is validated using motivational examples and using experimental results of the selected converters.