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Zheqing Li,Feng Jin,Chunyang Zhao,Eric Hsieh,Qiang Li 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
DC-DC converters are a critical component for the auxiliary power supplies in railway applications to regulate wide range input voltage. With the power consumption increasing, the momentum toward high-power high-density continues unbated. The key to shrink the converter size is high-frequency operation. The bottleneck is the magnetic component, especially for the high-power converters. With wide-band gap (WBG) devices, frequency can be hundreds of kilohertz level, which can reduce the transformer volume significantly. By adopting the shorting control for gain boost, only a small resonant inductance is required to handle the wide input voltage. The low inductance provides the opportunity to integrate the resonant inductor into the transformer to further reduce the size of magnetic components. In this paper, a novel transformer is proposed with the integration of additional leakage inductor for resonance with evenly distributed core loss, and no sacrifice the winding loss and. A 30-kW 100-kHz prototype with 2.4 kW/L power density is built to verify the feasibility of the proposed transformer, whose peak efficiency reaches 99.2%.
Core-Type Transformer Design Method with Integrated Series Inductance for DC-DC Converters
Murat Kaymak,Mustafa Enes Fincan,Rik W. De Doncker 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
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.