D22.3 - Design and Analysis of Leakage Inductance Integrated Transformer Structures Utilizing Interleaved Windings

Thursday, March 26, 2026

12:00 PM - 1:45 PM CT

Location: Hemisfair Ballroom

Technical Dialogue Presenter(s)

Sihoon Choi, PhD (he/him/his)

Nagoya University

Presentation Paper

Co-Author(s)

Kota Okada

Department of Electrical Engineering Nagoya University
JI

Jun Imaoka

Nagoya Universiy
MY

Masayoshi Yamamoto

Institute of Materials and Systems for Sustainability, Nagoya University
TI

Takayuki Ikari

EV System Laboratory, Research Division Nissan Motor Co., Ltd.
AO

Akinori Okubo

EV System Laboratory, Research Division Nissan Motor Co., Ltd.
YI

Yuichi Iwasaki

EV System Laboratory, Research Division Nissan Motor Co., Ltd.
TT

Takahiro Tokita

EV System Laboratory, Research Division Nissan Motor Co., Ltd.

Power electronics converters have been required to achieve high efficiency and high power density. Magnetic components which occupy a significant volume in converters have been miniaturized to satisfy the requirements. One approach to realize the miniaturization is to reduce the number of magnetic components through the integration of multiple windings within a single magnetic core. This paper proposes two types of integrated transformer structures with interleaved windings that incorporate leakage inductance. The series inductance value can be designed based on the number of primary turns located on either the outer or center leg. A design method based on magnetic circuits for each inductance and the maximum flux density within the core is presented. The feasibility of the proposed magnetic components is validated using a 48V-24V 50W prototype LLC resonant converter.