Timm Felix Baumann
About
I am doing my PhD in the cooperation project Diagnostics and Prognostics for Power Electronics Converters in Large-scale Accelerator Facilities
My supervisors are Dimosthenis Peftitsis from NTNU and Raul Murillo Garcia and Konstantinos Papastergiou from CERN.
The research work proceeded at NTNU from April 2021 until April 2022 and was continued at CERN in Geneva until December 2023. The final tasks are now ongoing at NTNU in Trondheim.
Background
In 2020 I received a Master of Science in Electrical Engineering degree from Technical University of Berlin. I focused on Power Electronics and had some insights into lighting technology. In a cooperation project at Aarhus University, I did my Master’s Thesis.
Parallel to this Master I studied for a second Master of Education in Electrical Engineering and Information Technology to teach at vocational schools.
My Bachelor in Electrical Engineering I received from Lucerne University of applied Sciences in 2015. I there I focused on Energy Systems, Power Electronics and Embedded Systems.
Research
This PhD is a collaboration project between NTNU and CERN. It focuses on improving the reliability of CERNs power converters by doing condition monitoring. The research objectives are:
- Identify opportunities for condition monitoring using existing converter measurements
- Establish the minimum requirements for number of signals, sampling rate and sampling precisions
- Explore a least one use-case of AI in condition monitoring and check useability
- Demonstrate the above with a prototype using existing converter families
The actual focus is on doing condition monitoring for DC-link electrolytic capacitors and liquid-cooled semiconductors – the two main critical elements of CERNs power converters.
For the capacitor banks, the potential of doing condition monitoring by analysing the discharge voltage decay is evaluated. An optimal way to sample the voltage is found. However, there is temperature dependency, but the decay depends also on how long the DC-link link was active.
Degraded semiconductors have increased power losses. This has the effect of an increased temperature and in the case of solder layer degradation additionally changed heat dissipation paths. In the case of liquid-cooled semiconductors, these heat dissipation paths (air and liquid) can be analysed separately for condition monitoring.
Additionally it is also possible to do an overall condition monitoring for the semiconductors by analysing the dissipated power into the liquid, because degraded components will have increased losses.
Publications
Get open access to all publication in the institute archive
2024
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Baumann, Timm Felix;
Garcia, Raul Murillo;
Papastergiou, Konstantinos;
Peftitsis, Dimosthenis.
(2024)
Discharge-Based Condition Monitoring for Electrolytic DC-Link Capacitors.
IEEE transactions on power electronics
Academic article
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Vivekanandham Pushpalatha, Yoganandam;
Philipps, Daniel Alexander;
Baumann, Timm Felix;
Peftitsis, Dimosthenis.
(2024)
Real-Time Discrete Electrothermal Model of Dual Active Bridge Converter for Photovoltaic Systems.
IEEE Journal of Emerging and Selected Topics in Power Electronics
Academic article
2023
-
Baumann, Timm Felix;
Papastergiou, Konstantinos;
Murillo Garcia, Raul;
Peftitsis, Dimosthenis.
(2023)
A Condition Monitoring Method for Solder Layer Degradation
of Liquid-Cooled Power Semiconductors.
IEEE conference proceedings
Academic chapter/article/Conference paper
2022
-
Baumann, Timm Felix;
Papastergiou, Konstantinos;
Raul Murillo, Murillo Garcia;
Peftitsis, Dimosthenis.
(2022)
A quasi-offline condition monitoring method of DC-link capacitor banks in accelerator power converters.
IEEE conference proceedings
Academic chapter/article/Conference paper
Journal publications
-
Baumann, Timm Felix;
Garcia, Raul Murillo;
Papastergiou, Konstantinos;
Peftitsis, Dimosthenis.
(2024)
Discharge-Based Condition Monitoring for Electrolytic DC-Link Capacitors.
IEEE transactions on power electronics
Academic article
-
Vivekanandham Pushpalatha, Yoganandam;
Philipps, Daniel Alexander;
Baumann, Timm Felix;
Peftitsis, Dimosthenis.
(2024)
Real-Time Discrete Electrothermal Model of Dual Active Bridge Converter for Photovoltaic Systems.
IEEE Journal of Emerging and Selected Topics in Power Electronics
Academic article
Part of book/report
-
Baumann, Timm Felix;
Papastergiou, Konstantinos;
Murillo Garcia, Raul;
Peftitsis, Dimosthenis.
(2023)
A Condition Monitoring Method for Solder Layer Degradation
of Liquid-Cooled Power Semiconductors.
IEEE conference proceedings
Academic chapter/article/Conference paper
-
Baumann, Timm Felix;
Papastergiou, Konstantinos;
Raul Murillo, Murillo Garcia;
Peftitsis, Dimosthenis.
(2022)
A quasi-offline condition monitoring method of DC-link capacitor banks in accelerator power converters.
IEEE conference proceedings
Academic chapter/article/Conference paper