A Six-Phase Interleaved Buck-Boost Converter using Adaptive Delta Modulation Control loop for Renewable Energy Applications

The design and simulation of a six-phase interleaved buck-boost DC/DC converter are detailed in this paper. An adaptive delta modulation control loop strategy has been employed. This strategy has not been previously applied to interleaved buck-boost converters. The converter provides an output voltage of 48 V and 10KW output power which conforms to the requirements of the 24/48V scheme used in the Small-Scale Renewable Energy Systems (SRES) and similar applications. The design, simulation and analysis of the buck-boost converter power system in the multi-phase interleaved scheme are presented. This converter is designed to operate in a Discontinuous Conduction Mode (DCM). The effect of the design parameters variation on the performance capabilities of the converter is described. Simulation results are presented to demonstrate the advantages of the presented control technique and the converter scheme. All the normal advantages associated with interleaving, such as higher efficiency and reduced input/output ripples for current and voltage, are also achieved in the converter. The results show that the output voltage is stable and remains within the desired specified values for a range of input voltage variations.