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A simple, reliable, cost and volume saving DC-link discharge device for electric vehicles

: Kreutzer, O.; Eckardt, B.; März, M.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Transportation Electrification Conference and Expo, ITEC 2015 : Dearborn, Michigan, USA, 14 - 17 June 2015
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4673-6742-4
ISBN: 978-1-4673-6741-7
Transportation Electrification Conference and Expo (ITEC) <2015, Dearborn/Mich.>
Fraunhofer IISB ()

This paper describes a DC-link discharge device that is smaller and cheaper than conventional resistor or PTC-based solutions. The basic idea is to use the switching element (IGBT, Mosfet), that is usually controlling the PTC or resistor, in a linear mode and decrease the maximum power by shifting the discharge curve from an uncontrolled square voltage dependent curve to a roughly constant power characteristic. The advantages in volume and costs are described and the technical setup is explained and compared to the conventional solutions.