A novel modeling concept for multi-coupling core structures

Coupling inductors between two channels can improve both the steady state and dynamic performances of multi-channel interleaving voltage regulator modules (VRMs). However, the complicated electrical circuit model for the multi-coupling core structures prevents the coupling concept from being extended to integrated multi-channel core structures. This paper presents a novel circuit modeling concept that can be easily applied to different complicated multi-coupling core structures. Compared to conventional modeling methods, the proposed method involves fewer inductors. It is more directly related to the physical core structures and is easier to converge in computer simulation. Simulation results are presented to verify the validity of this modeling concept.