Investigation of non-linear phenomenon for integrated magnetics used in LLC converters

This paper examines the non-linear behavior of integrated magnetics used in Linear Level Control (LLC) converters. Due to the non-linear behavior of the magnetics, implementation of magnetic integration needs to be carefully considered. The saturation of magnetics is normally not a concern in high voltage input applications [1], but becomes a serious issue when designing the low voltage input and high power applications. The inserted magnetic integration has been categorized into two types according to the position of their magnetic insertions. The inserted magnetic structure MIO as presented in [1], and MIP structure introduced in [2]. They performs poorly in high power and low voltage input applications over add-on type of magnetic integration structure [3].A brief discussion of these two categories is presented. The completed analysis and simulation results, using the 3-Dimensional (3-D) Finite Element Method (FEM), will be presented in the full paper.