Operation of Fault-Tolerant Non-Isolated Multiphase 3-Level DC–DC Converters for 48 V Automotive Power Systems

Titelangaben

Gleißner, Michael ; Bakran, Mark-M.:
Operation of Fault-Tolerant Non-Isolated Multiphase 3-Level DC–DC Converters for 48 V Automotive Power Systems.
2015
Veranstaltung: EPE'15 ECCE Europe 17th European Conference on Power Electronics and Applications , 08.-10.09.2015 , Genf, Schweiz.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )

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Abstract

The operation of a non-isolated, bidirectional DC–DC converter with several interleaving phases of 3-level flying capacitor modules for automotive power systems is analysed in theory and a 3-phase prototype implementation. Control techniques for equal phase current sharing and flying capacitor voltage balance are applied. The converter efficiency is compared to a status quo 2-level multiphase converter with protection switches. Moreover, the system behaviour in case of semiconductor switch failures is investigated. The 3-level modules are always superior to a 2-level structure and need only the relatively small flying capacitor as additional component.