An interleaved single-input multiple-output dc-dc converter combination

Abstract

This paper analyses, simulates and verifies an experimental prototype of a four-phase interleaved dc-dc converter. It is based on SEPIC-Cuk combination. The developed prototype has been used in single-input multiple-output (SIMO) applications. This combined converter allows obtaining dual output voltages of the same value, from a single input dc voltage and with an only power switch. Multiphase interleaved dc-dc converters achieve a better dynamic response and low ripple, maintaining the efficiency. Each converter is connected in parallel, therefore they manage the losses by distributing them between more components, which facilitates the thermal management of the multiphase converter and allowing to handle high power values in small size respect of solutions of a single phase. Two control strategies were applied: synchronous operation mode (SOM) and interleaved operation mode (IOM). The simulation results allow the comparison of both operation mode, verifying that the IOM presents advantage with respect to the ripple at the input and output currents. The experimental prototype was designed for distributed power architecture and bipolar dc microgrid (MG).