Design and control of fault-tolerant non-isolated multiphase multilevel DC-DC converters for automotive power systems

Author

Gleissner, Michael ; Bakran, Mark-M

Author_Institution

Dept. of Mechatron., Univ. of Bayreuth, Bayreuth, Germany

fYear

2015

fDate

3-5 March 2015

Firstpage

1

Lastpage

6

Abstract

In this paper, a bidirectional, non-isolated dc-dc converter with several interleaved phases of multilevel modules for automotive power systems is presented. Instead of using a 2-level stage with short-circuit protection elements, a 3-level module in a multiphase structure is proposed to achieve improved fault-tolerance. The dimensioning of the required flying capacitor for multilevel dc-dc converters is described. Further benefits like ripple reduction, automatic fault current limitation and enhanced efficiency are achieved. Moreover, the control strategy for normal operation including the stability of the flying capacitor voltage as well as reconfiguration after failure for degraded operation are explained.

Keywords

DC-DC power convertors; automotive electrics; fault current limiters; fault tolerance; short-circuit currents; 3-level module; automatic fault current limitation; automotive power systems; bidirectional DC-DC converters; fault tolerance; flying capacitor voltage; multilevel modules; multiphase multilevel DC-DC converters; multiphase structure; nonisolated DC-DC converters; ripple reduction; short-circuit protection elements; Capacitors; Fault tolerance; Fault tolerant systems; Inductors; Semiconductor device measurement; Switches; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS), 2015 International Conference on

Conference_Location

Aachen

Type

conf

DOI

10.1109/ESARS.2015.7101447

Filename

7101447