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Magnar Hernes

Senior Research Scientist

Magnar Hernes

Senior Research Scientist

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

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+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 Göthner Fredrik T. B. W. Spro Ole Christian Hernes Magnar Peftitsis Dimosthenis
Year 2018
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+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 Spro Ole Christian Guidi Giuseppe Ljøkelsøy Kjell Hernes Magnar Midtgård Ole-Morten Undeland Tore Marvin
Year 2018
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+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 Tinschert Lukas Hernes Magnar Lutz Josef
Year 2016
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+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 Bergna Diaz Gilbert D'Arco Salvatore Suul Jon Are Wold Hernes Magnar
Year 2016
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+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 Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+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 Tinschert Lukas Årdal Atle Rygg Poller Tilo Bohlländer Marco Hernes Magnar Lutz Josef
Year 2015
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1069606

Press-pack IGBTs are manufactured with a multi-layered structure composed of internal layers with different geometrical shape and physical properties. The device is clamped and an external pressure is applied on the housing in order to establish a sufficient electrical and thermal contact between th...

Authors Poller T Lutz J D'Arco Salvatore Hernes Magnar
Year 2013
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1059214

The press-pack housing was initially available only in monolithic thyristors, diodes and GTOs for high power applications with strict reliability requirements. Due the technological developments of the last years, the IGBT became a common solution for power electronics converters including the highe...

Authors Poller T D'Arco Salvatore Hernes Magnar Årdal Atle Rygg Lutz J
Year 2013
Type Journal publication