Integrated Interleaved Transformer in an Isolated Full-Bridge Buck Converter

Abstract

In recent years, the transformer has gained significant popularity due to its crucial role in various fields. This paper presents a design and modeling approach for an interleaved transformer integrated into an isolated full-bridge buck converter. The characteristics of the converter are first specified, followed by a description of the transformer to determine the geometric parameters. The technical characteristics, represented by analytical expressions, are addressed in the authorized electrical model of the integrated interleaved transformer. The simulations reveal the impact of the interleaved transformer’s geometric parameters on the inductance value, quality factor, and coupling coefficient. Additionally, the simulation results demonstrate that reducing the conductor width, internal diameter, and number of turns leads to a higher quality factor. To validate the proper functioning of the interleaved transformer, simulations of the isolated full-bridge buck converter are conducted. The simulations encompass both a conventional transformer and an integrated interleaved transformer, with waveforms of currents and voltages analyzed. In both cases, the simulation results exhibit strong similarities and align with the specified requirements.