Analysis of a Transformerless High Step-Down DC-DC Converter

Abstract

The analysis and performance of a proposed high step-down DC-DC converter without employing transformers are discussed in this article. The operating principle of the control signals in this proposed converter is similar to the traditional two-phase interleaved buck converter, resulting in a simple controller. Moreover, the proposed converter has lower switches' voltage stress than the traditional buck converter. Therefore, the low voltage rating switches can be considered to achieve low losses, high efficiency, and low cost. Besides, the comparisons between the proposed converter and the previous high step-down topologies are presented to show the benefits of the proposed topology such as lower passive component count and higher effective duty cycle range. The experimental results of the 48W prototype have been provided to validate the theoretical analysis.