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Diamond Schottky-Diode in a non-isolated buck converter

: Reiner, Richard; Zürbig, Verena; Pinti, Lucas; Reinke, Philipp; Meder, Dirk; Mönch, Stefan; Benkhelifa, Fouad; Quay, Rüdiger; Cimalla, Volker; Nebel, Christoph E.; Ambacher, Oliver

MESAGO Messe Frankfurt GmbH, Stuttgart:
PCIM Europe 2019, International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management. CD-ROM : Nuremberg, 7-9 May 2019; Proceedings
Berlin: VDE-Verlag, 2019
ISBN: 978-3-8007-4938-6
5 S.
PCIM Europe <2019, Nuremberg>
Fraunhofer IAF ()

This work presents the in-circuit operation of a diamond Schottky-diode in a non-isolated buck converter for LED applications at mains voltage. A Schottky-diode on boron doped monocrystalline diamond substrate was assembled in an engineering package. Test structures show breakdown voltages up to 1250 V, current densities up to 470 A/cm², a reverse charge below 1 nC and a decreasing on-resistance with increasing temperature. The packaged device was operated with a peak current of 1 A in a 30W buck converter with stable operation at 125°C. The converter achieves a maximum total efficiency of 87% at 14 W.