Investigation of Nonlinear Phenomenon for Insertion Type Integrated Magnetics Used in Linear Level Control Converters

This paper examines the nonlinear behavior of inserted type integrated magnetics used in linear level control converters. Due to the nonlinear behavior of the magnetics, an implementation of the insertion type magnetic integration needs to be carefully considered. The saturation of magnetics is normally not a concern in high-voltage input applications, but becomes a serious issue when designing for low-voltage input and high power applications. In this paper, the inserted type integrated magnetics has been categorized into two types according to their magnetic integration configurations. Investigation and discussion of their nonlinear behavior will be presented with the assistance of 3-D simulation results based on the finite-element method. A case study of a 350 W dc-dc converter is used throughout this paper for the ease of illustration.