Four-phase interleaved DC-DC step-down converter using coupled inductor for high power application

The objective of this manuscript is to analyze and design a new interleaved dc-dc buck-type converter based on the conventional interleaved topologies. The proposed converter consists of small size filters, few component numbers, and low current and voltage ripple compared with interleaved dc-dc converter family. Furthermore, detailed comparisons are made concerning the operating mode, the component numbers, dc voltage gain, voltage stresses, output inductor current ripple, rated power, and efficiency. The presented converter might replace the conventional dc-dc step-down voltage converter stage of poor power quality and low energy density, such as the one used in high power ac-dc battery chargers and dc sources, among others. Experimental results conducted on a 4.8-kW laboratory prototype are presented to validate the theoretical study and prove the effectiveness of the proposed topology. The maximum efficiency level reaches 97.2% at rated power.