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©2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. ; A major upgrade will be conducted in the Large Hardon Collider (LHC) at CERN. This high-luminosity (HL) version of the LHC will increase the nominal luminosity by a factor of five. One of the key technologies of the HL-LHC is the new superconducting inner triplet (IT) magnets, responsible of producing high magnetic fields to focus particle beams. To power the IT magnets from the grid, a multistage power supply with an intermediate 24-V battery pack is being considered. In such topology, a low-voltage high-current dc/dc converter operating with a very high step-down ratio is required for the final conversion stage. In this work, an interleaved multiphase series capacitor buck converter is proposed to feed the IT magnets from the battery pack. A novel voltage regulation approach that ensures the current balance between the paralleled series capacitor cells is also proposed, where one cell is responsible for the output voltage regulation, while the remaining cells are current-regulated. A balanced current sharing between the series capacitor cells is achieved, when the current-controlled cells are referenced by the actual current of the first one. The proposal is theoretically analyzed and experimentally validated in a six-cell 1000-A prototype unit. ; This work was supported in part by the HL-LHC project by the CERN and APERT (UPV/EHU) "Collaboration in the Study of Power Converter Topologies for Inner Triplet magnets with Energy Recovery in the framework of the High Luminosity upgrade for the LHC at CERN," in part by the Government of the Basque Country within the fund for research groups of the Basque University system under Grant ...

Requirements for electric vehicle (EV) propulsion systems—i.e., power density, switching frequency and cost—are becoming more stringent, while high reliability also needs to be ensured to maximize a vehicle's life-cycle. Thus, the incorporation of a thermal management strategy is convenient, as most power inverter failure mechanisms are related to excessive semiconductor junction temperatures. This paper proposes a novel thermal management strategy which smartly varies the switching frequency to keep the semiconductors' junction temperatures low enough and consequently extend the EV life-cycle. Thanks to the proposal, the drivetrain can operate safely at maximum attainable performance limits. The proposal is validated through simulation in an advanced digital platform, considering a 75-kW in-wheel Interior Permanent Magnet Synchronous Machine (IPMSM) drive fed by an automotive Silicon Carbide (SiC) power converter. ; This work has been supported in part by the European Commission through ECSEL Joint Undertaking (JU) under Grant Agreement No. 783174 (HiPERFORM project), by the Government of the Basque Country within the research program ELKARTEK as the projects ELPIVE (KK-2019/0006) and ENSOL 2 (KK-2020/00077), by the Government of the Basque Country within the fund for research groups of the Basque University system IT978-16, by the Government of Spain through the Agencia Estatal de Investigación Project DPI2017-85404-P, and by the Generalitat de Catalunya through the Project 2017 SGR 872. ; Peer Reviewed ; Postprint (published version)