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A Highly Efficient DC-DC-Converter for Medium-Voltage Applications

: Thoma, J.; Chilachava, D.; Kranzer, D.


Kuzle, I. ; Institute of Electrical and Electronics Engineers -IEEE-; Institute of Electrical and Electronics Engineers -IEEE-, Region Europe, Middle East, Africa:
IEEE International Energy Conference, ENERGYCON 2014. Vol.1 : Dubrovnik, Croatia, 13 - 16 May 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-2450-9
ISBN: 978-1-4799-2449-3
International Energy Conference (ENERGYCON) <3, 2014, Dubrovnik>
Conference Paper
Fraunhofer ISE ()
Elektrische Energiesysteme; Energieeffiziente Leistungselektronik; Energieeffiziente Geräte

In the electrical energy distribution network of the future, power electronics will become more and more important. Especially the expansion of renewable energies such as photovoltaic and wind requires a rising number of converters between generator and consumer of electrical energy. With the use of silicon carbide (SiC) high voltage power semiconductor devices it will be possible to build highly efficient converters, which can feed directly into the medium voltage grid. An increase of the voltage level will reduce the current and thereby the copper cross sections but also the coupling with a 50/60-Hz transformer can be omitted. The potential of these devices is shown in this paper by the presentation of a 28 kW DC-DC-Converter with 10 kV / 10 A SiC MOSFETs. With an input voltage of 3.5 kV and an output voltage of 8.5 kV the converter reaches an efficiency of 98.5 % with a switching frequency of 8 kHz.