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Three-winding coupled inductor structures have gained popularity in high-voltage-gain dc–dc converters. This cell allows generating an infinity of topologies. However, there are no well-established methods for synthesizing these types of converters. In this sense, in order to contribute and create a simple synthesis and generation of high-voltage-gain converters, this article presents a family of high step-up dc–dc converters based on boost converter and three-winding coupled inductor cell with different connection configurations, named: stacked, parallel, and cascade. These connections are discussed throughout this article. Furthermore, combinations of two or more connections are presented and their generated topologies as well. In addition, comparative evaluations are presented, such as high-voltage-gain converters: principle of operation; static gain; voltage stress; current stress. Since each converter has its own characteristics and the main factors that impact this are the duty cyclic ($D$), turns ratio ($N$) of the coupled inductor, both theoretical and experimental evaluations are made considering different values of $D$ and $N$. To validate the theoretical analyzes, a set of prototypes was built in the laboratory. Among these evaluated topologies, the one with the high efficiency performance achieved is 97%, which is the combination of stacked configuration with voltage multiplier cell.

In this article a synthesis, comparative analyses, and architecture classification of the family of bidirectional boost/buck power converters is done taking into account the low voltage dc bus as input and high voltage as output. The classification can be input/output as series or parallel, where the series characteristic is the voltage division between the modules, while the parallel characteristic presents the current division feature. Also, in this article, an architecture is shown, which presents the characteristics of both, the parallel and series approach, at the same time. The theoretical analyses about voltage and current stresses, as well as voltage gain is carried out and validated through experimental results for nine prototypes that were built in the laboratory. The efficiency curves was extracted from 500 W to 1 kW.

A new nonisolated bidirectional dc–dc converter with low voltage and current stresses across the semiconductor devices is presented in this article. The proposed converter is a combination of a dual-stacked bidirectional boost converter. The converter presents different operations modes, such as: synchronous and asynchronous. These modes can reduce the current ripple of the voltage source. Besides that, in this article, the modeling and control of the proposed converter are done. To validate the theoretical evaluations of the proposed converter, a 1-kW, 144-V/400-V prototype was built to verify its performance where the peak efficiency is 96.33% and 96.87% for step-up and step-down modes, respectively.

In this brief, comparison of coupled inductors with two and three windings is presented. For this, an implementation of two simple hybrid topologies was carried out, which will be presented with their principle of operation, and performance analysis, e.g., comparison of voltage and current stress. A design guideline is presented to reduce the effect of leakage inductance and winding resistance. Five prototypes each with 250 W, were built in the laboratory to verify the performance of the converters for different values of duty cycle $(D)$ and turns ratio $(N)$ .