Integrated Inductor-Transformers for High-Frequency Converters: An Overview

This is the authors' abstract. We don't add key points for this paper.

Integrated inductor-transformers, eliminating the need for external series inductors, provide disruptive improvements towards compact, efficient, and cost-effective converters in industries such as automotive and data centre power supplies. However, their successful implementation requires thoughtful design considerations; otherwise, their potential benefits are voided. This paper exposes the potential of integrated inductor-transformers through a systematic review of existing state-of-the-art designs and synergies with other innovative technologies such as PCB windings, matrix transformers, advanced winding structures and custom core shapes. The fundamental principles governing their operation are addressed, as well as modelling guidelines for each of the integration methods. These methods are categorised, described, and validated through finite element studies. Three complementary comparison approaches are presented, an analytical comparison, statistical analysis, and qualitative assessment, to evaluate inductor-transformer solutions across key metrics including achievable inductance, power density, manufacturability, and EMI performance. Finally, the paper presents a forward-looking analysis of emerging trends, critical challenges, and untapped opportunities in high-frequency magnetic component research. Hence, this overview supports the understanding of future developments in integrated magnetic components for compact, efficient, and cost-effective power converters. The paper is accompanied by a CSV record of all qualified references to aid future research contributions and statistical analysis.