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Magnar Hernes

Senior Research Scientist

Magnar Hernes

Senior Research Scientist

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

Publications and responsibilities

Publications

Publication

Improving the short circuit ruggedness of IGBTs

http://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

Analysis of power cycling for semiconductor devices in modular multilevel converters

http://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

Liquid insulation of IGBT modules: Long term chemical compatibility and high voltage endurance testing

http://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...

Authors Liland Knut Brede Lesaint Cedric Michel Lundgaard Lars Esben Hernes Magnar Glomm Wilhelm
Year 2016
Type Part of a book/report
Publication

Possible failure modes in Press-Pack IGBTs

http://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

Determination of the thermal and electrical contact resistance in press-pack IGBTs

http://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

Influence of the clamping pressure on the electrical, thermal and mechanical behaviour of press-pack IGBTs

http://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
Publication

Efficiency analysis of non-insulated converters for DC series collection in offshore wind farms

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1001235

Collection schemes based on DC technologies appear as a possible alternative to present layouts of offshore wind farms to reduce the installation and operational costs. Within these internal DC collection schemes, series connection can be particularly attractive when a sufficiently high number of un...

Authors D'Arco Salvatore Årdal Atle Rygg Hernes Magnar
Year 2012
Type Part of a book/report
Publication

Influence of thermal cross-couplings on power cycling lifetime of IGBT power modules

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+1001182

Power cycling lifetime in a semiconductor module accounts for the progressive fatigue of the device due to repetitive thermo - mechanical stress. Mathematical models for the lifetime express the number of cycles that the device can withstand before failing under predefined repetitive conditions. The...

Authors Poller T D'Arco Salvatore Hernes Magnar Lutz J
Year 2012
Type Part of a book/report
Publication

Mechanical analysis of press-pack IGBTs

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+938677

At present two packages for IGBT devices are available for applications in the MW power range: the bonded power module and the press-pack housing. Power modules have been object of extensive research including their thermo-mechanical characterisation under variable operating conditions and the analy...

Authors Poller T Basler Thomas Hernes Magnar D'Arco Salvatore Lutz J
Year 2012
Type Journal publication
Publication

Pressure-tolerant power electronics for deep and ultra-deep water

http://www.sintef.no/en/publications/publication/?pubid=CRIStin+913772

This paper presents results from an ongoing research project (SINTEF 2011) on pressure-tolerant power electronics. The main goal of the research is to provide and demonstrate solutions that enable power-electronic converters to operate in pressurized environments. Oil companies have plans for subsea...

Authors Pittini Riccardo Hernes Magnar
Year 2012
Type Journal publication
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