Digital control approaches to mitigate the impact of loop competition in multiphase DC-DC converter

Abstract

In multiphase synchronous buck converters, the parallel structure is used for the voltage and current sharing regulation loops to improve high bandwidth. Mismatch among the multiple regulation loops result in competition among voltage and current regulation loops, until one or more loops goes into saturation. Competition control approaches are designed to keep the loops from saturation and reach to a steady state operating point with all loops active adaptively. Such steady state operation can be reached adaptively even with load transients and environmental variations.