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Advantages and challenges of using sic mosfets in a high power density insulated hv/lv dc/dc converter

: Zeltner, S.; Seliger, B.; Haager, D.; Eckardt, B.; Bach, L.; Yu, Z.; Vater, S.; Bayer, C.F.; Schletz, A.; Umeda, H.; Morita, T.

PCIM Europe 2020, International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management. CD-ROM : 07.-08.07.2020 : proceedings
Berlin: VDE-Verlag, 2020
ISBN: 978-3-8007-5245-4
PCIM Europe Digital Days <2020, Online>
Fraunhofer IISB ()
DC-DC converters; Energy management; HVDC power transmission; Intelligent robots; MOSFET devices; Power electronics; Silicon; Silicon carbide; Silicon compounds; Vehicle-to-grid; Electric cars; Electric power grids; High power density; Maximum power density; Power grids; SiC MOSFETs; Electric power transmission networks

A safe connection of on-board automotive electric power grids is done by insulating HV/LV DC/DC con-verters. Latest electric car architectures are operating with 800 V batteries and 48 V power grids. Hence, compact 800 V/48 V DC/DC converters are necessary. Within the following paper advantages and challenges of using SiC MOSFETs in such applications are discussed. A developed compact prototype with maximum power density of ca. 8 kW/dm³ and power weight of ca. 3 kW/kg is presented which uses different suggested solutions to manage the named challenges when using SiC MOSFETs.