Design of a High-Reduction Ratio, Doubly Interleaved Buck Converter

In recent years, Electric Vehicles (EVs) have become a necessity more than a luxury, justified by the urgency of transitioning to a sustainable movability, being DC-DC and DC-AC converters the heart of this technology. Interleaved Buck DC-DC Converters are commonly used as energy buffers in this application, being high-power density circuits a critical aim in this type of converters. This paper presents a preliminary design assessment of an interleaved buck DC-DC converter with high reduction ratio, that uses a double magnetic together with a coupling capacitor to increase the reduction conversion ratio and power density. A brief survey around the steady-state principle of operation of this DC-DC circuit is presented together with a description of the initial setup towards the building of a 4 kW prototype.