Cosimulation Approach for High-Frequency Magnetic Component Modeling in DC-DC Converters

Abstract

This dissertation aims to evaluate the efficacy of a novel methodology to support the transient analysis and electromagnetic design of high-frequency transformers and inductors in power converters. By integrating finite element method (FEM)-based tools with dynamic analysis techniques, the proposed methodology accurately reflects the physical characteristics of high- frequency magnetic components under both steady-state and transient conditions in power converters. This approach addresses the stresses generated by the extensive integration of power electronic-interfaced sources, loads, and storage units in various power electronic topologies. High-frequency transformers and inductors are highlighted as crucial elements for the next generation of energy systems, driven by advancements in distributed power generation, DC power grids, energy storage, and sensitive electronic loads. High-frequency transformers offer benefits such as galvanic isolation, high power density, small size, low cost, high efficiency, output regulation, and improved electromagnetic compatibility performance, making them vital for modern energy applications. High-frequency inductors, on the other hand, enhance the efficiency of energy transfer, stabilize voltage regulation, and minimize switching losses in power converters, significantly improving the performance of photovoltaic power systems, electric drives, and adjustable power supplies. The proposed methodology is implemented through cosimulation between COMSOL Multiphysics® and MATLAB/Simulink®, demonstrating its potential to advance the design and analysis of high-frequency magnetic components.