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Magnar Hernes

Senior Research Scientist

Magnar Hernes

Senior Research Scientist

Magnar Hernes
Phone: 930 03 738
Email:
Department: Energy Systems
Office: Trondheim

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/?pubid=1702309

The aim of this work is to obtain a reliable estimation of the remaining lifetime of power-electronic modules. Lifetime models provide information on the fatigue durability of power modules under repetitive loading circumstances. However, the thermo-mechanical stresses that a device is exposed to du...

Authors Antonios Antonopoulos Salvatore D'Arco Magnar Hernes Dimosthenis Peftitsis
Year 2019
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1637260

This paper presents a driver topology intended for WBG devices with the goal of improving the switching performance. In particular, the initial delay time of the switching transient was targeted. In high power and high frequency bridge converters, the dead time causes output voltage waveform distort...

Authors Ole Christian Spro Giuseppe Guidi Kjell Ljøkelsøy Magnar Hernes Ole-Morten Midtgård Tore Marvin Undeland
Year 2018
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1638774

This paper investigates the power cycling methodology for reliability testing of SiC metal-oxide-semiconductor field-effect transistors (MOSFETs). Dedicated test benches were designed and built to study this issue. The results indicate that power cycling of SiC MOSFETs is affected by threshold volta...

Authors Fredrik T. B. W. Göthner Ole Christian Spro Magnar Hernes Dimosthenis Peftitsis
Year 2018
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1385622

To facilitate operation of power electronics for subsea operation at ambient pressure components have to be submerged in a liquid. Equipment and schemes for testing of long term properties have been developed. Several techniques were used to investigate compatibility between a silicone gel and vario...

Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1398826

The demands on reliable and fault tolerant power electronic devices are increasing. One opportunity to increase the IGBT short circuit ruggedness is to modify the thermal capacitance and the thermal resistance close to the chip and hence extend the possible short circuit duration. Therefore simulati...

Authors Lukas Tinschert Magnar Hernes Josef Lutz
Year 2016
Type Academic article
Publication
https://www.sintef.no/en/publications/publication/?pubid=1391562

This paper presents a numerical analysis of the temperature profiles within the semiconductor devices of modular multilevel converters (MMCs). These temperature profiles are essential for assessing the power-cycling lifetime of IGBT modules, which influences the converter reliability. An electro-the...

Authors Gilbert Bergna Diaz Salvatore D'Arco Jon Are Wold Suul Magnar Hernes
Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1236187

Reliability of Press-Pack IGBTs is a topic with limited published data and information. This paper presents results of a power cycling test with state-of-the-art high power devices. An accelerated lifetime test scheme was defined, and six out of eight devices were tested until failure. A microscopy ...

Authors Lukas Tinschert Atle Rygg Årdal Tilo Poller Marco Bohlländer Magnar Hernes Josef Lutz
Year 2015
Type Academic article