Core-Type Transformer Design Method with Integrated Series Inductance for DC-DC Converters

This paper presents two different methods to design Medium-Frequency Transformers (MFT) with required ac-link series inductance of a galvanically isolated dc-dc converter. The series inductance of the ac-link is usually formed by the leakage or stray inductance of the MFT and an additional external inductor. Here, two approaches are presented, avoiding the extra external series inductor by designing the transformer with an increased and defined leakage inductance.