Effect of Mutual Coupling on CCM/DCM Boundary in Single Input Dual Output Boost Converter

Abstract

DC-DC converters with different voltage levels have gained attention due to the increasing use of portable electronic devices and hybrid energy systems. The two structures that produce multiple DC voltage levels are-multiple individual single input single output (SISO) converters and single input multiple output (SIMO) converters. SIMO converter architectures are more efficient and compact alternative to multiple numbers of SISO converters. Single input dual output (SIDO) boost converter with magnetically coupled inductors is focused in the paper. The introduction of the coupled inductor in SIDO converter makes the system compact due to one magnetic core. The converter operates in two modes-continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The transition between CCM and DCM occurs at boundary condition. The paper investigates the mutually coupled SIDO boost converter at CCM/DCM boundary condition. Due to mutual coupling between the two boost converters of SIDO boost, the change in parameters of one boost affects the boundary condition of another boost. The paper studies the effect of the parameters variation of the second boost on the boundary condition of the first boost and vice-versa. The analysis is verified by simulation in MATLAB/Simulink environment and the simulation results are presented.