@inproceedings{PueschelSeliger2025, author = {P{\"u}schel, Maximilian and Seliger, Norbert}, title = {Multiple-Frequency Three Coil Inductive Power Transmission with Non-Linear Relay Resonator}, series = {Proceedings Southeastcon 2025}, booktitle = {Proceedings Southeastcon 2025}, publisher = {IEEE}, isbn = {979-8-3315-0484-7}, issn = {1558-058X}, doi = {10.1109/SoutheastCon56624.2025.10971670}, pages = {34 -- 39}, year = {2025}, abstract = {We propose near-field inductive power transfer with three coils in the frequency range of a few MHz. The relay coil is part of a non-linear resonator having a diode connected in parallel to the resonant capacitor. We achieve power transfer at multiple frequencies which can be tuned by the input power level and mutual coupling between the coils. Higher harmonic generation is found dominant at lower input power, whereas subharmonic generation (period doubling and period quadrupling) is observed at high levels. Power transfer at subharmonics reveals robustness against level perturbations due to pronounced amplitude hysteresis effect. A circuit simulation based on standard non-linear diode SPICE models confirms the experimental results which are obtained on a demonstration prototype.}, language = {en} } @inproceedings{YilmazMariAsametal.2025, author = {Yilmaz, Tugce and Mari, Jorge and Asam, Johann and Kirner, Michael and List, Andreas and Fantauzzo, Lucia and Seliger, Norbert}, title = {AC Cycling Testing of SiC MOSFET Power Module}, series = {Proccedings International exhibition and conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM 2025)}, booktitle = {Proccedings International exhibition and conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM 2025)}, publisher = {VDE VERLAG GMBH}, address = {Berlin}, isbn = {978-3-8007-6541-6}, doi = {10.30420/566541341}, pages = {2562 -- 2567}, year = {2025}, abstract = {This paper details the development of an accelerated AC cycling test bench for evaluating the aging mechanisms of SiC MOSFET power modules. Contrary to classical HTGS and DGS which only exercise gate source stresses the AC Cycler switched under high voltage and current. Operating for about 235 hours, the system maintained stable thermal conditions thanks to an integrated cooling system. Key precursors of aging, such as increases in threshold voltage and on-state resistance were identified using static characterization curve tracer before and after the test. Gate charge and Vdson were also measured on-line with specially developed gate drivers.}, language = {en} } @inproceedings{Seliger2025, author = {Seliger, Norbert}, title = {Introducing Environmental Sustainability in an RF and EMC Lab Course Utilizing Reusable, Recyclable and Biodegradable Circuits}, series = {Proceedings IEEE educon 2025}, booktitle = {Proceedings IEEE educon 2025}, publisher = {IEEE}, doi = {10.1109/EDUCON62633.2025.11016365}, pages = {9}, year = {2025}, abstract = {We propose to introduce environmental sustainability in a radio frequency (RF) and electromagnetic compatibility (EMC) laboratory course for an electrical engineering bachelor's program utilizing reusable, easily recyclable and ecologically harmless (biodegradable) circuits. Our concept is based on the replacement of state-of-the-art printed circuit boards by substrates with mechanically structured adhesive Cu and Zinc films. Furthermore, organic based circuit carriers can be substituted by biodegradable paper substrates. As an example for the RF lab, we discuss the design, simulation and experimental characterization of a microwave low-pass filter with 1.2GHz cut-off frequency. Secondly, for an EMC lab we suggest a prototype for power integrity (PI) studies based on the current imbalance method for reducing common mode radiated emission. As a novel feature during the lab course, the instructor in addition gives a lecture highlighting the electronic waste challenge, which is accompanied by group discussions on sustainability and recycling. As a final lab course task students are asked to disassemble the boards or prepare them for reuse, followed by material sorting and submission to recycling institutions.}, language = {en} } @inproceedings{SeligerLeirich2025, author = {Seliger, Norbert and Leirich, Nico}, title = {Reconfigurable single-layer air coil inductor with bistable compliant windings}, series = {Proceedings EPE 25}, booktitle = {Proceedings EPE 25}, publisher = {EPE Association}, doi = {10.34746/epe2025-0012}, pages = {10}, year = {2025}, abstract = {We present an air coil with bistable compliant single layer windings. Due to stable elastic snapping deformation of wire segments, the self-inductance of the air coil can be precisely varied in multiple steps. A numerical and analytical design methodology is proposed and successfully validated by magneto-quasi-static field simulations and experiments on prototypes.}, language = {en} } @misc{SchoenauSchoenauDaumeetal.2024, author = {Sch{\"o}nau, Maximilian and Sch{\"o}nau, Elisabeth and Daume, Darwin and Panhuysen, Markus and Schulze, Achim and H{\"u}ttl, Bernd and Landes, Dieter}, title = {Improved Sampling of IV Measurements}, series = {Proceedings of the 41st EU PVSEC}, journal = {Proceedings of the 41st EU PVSEC}, publisher = {Proceedings of the 41st EU PVSEC}, doi = {10.4229/EUPVSEC2024/3AV.3.50}, pages = {3}, year = {2024}, abstract = {The measurement of IV curves is the most important characterization technique of photovoltaic devices. This work seeks to determine a fair sampling rate for IV curves. Traditional sampling methods, such as using equidistant voltage steps, result in biased data by over- and undersampling the measurement at different voltages, which affect critical evaluations such as maximum power point (MPP) determination as well as series and shunt resistance estimation. Therefore, an adaptive sampling approach based on calculating the arc length of the IV curve is proposed, aiming to distribute data points equidistantly along the curve. This method is intended to provide a more balanced representation of the measurement data across all segments of the curve. The results indicate that using this adaptive approach, the measurement points can be significantly reduced at lower voltages while maintaining essential data density at key characteristics such as the MPP, facilitating faster and more accurate assessments.}, language = {en} } @techreport{MeckingKruseWinteretal.2017, author = {Mecking, Simon and Kruse, Tobias and Winter, Christoph and Schanda, Ulrich}, title = {Vibroakustik im Planungsprozess f{\"u}r Holzbauten - Modellierung, numerische Simulation, Validierung, Teilprojekt 3: Parameterentwicklung und SEA-Modellierung, Schlussbericht}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-4861}, year = {2017}, abstract = {Auf Basis empirischer Daten wurde die Diffusit{\"a}t des K{\"o}rperschallfeldes von Brettsperrholz-Bauteilen in realistischer Gr{\"o}ße beschrieben und Verteilungssch{\"a}tzungen in Abh{\"a}ngigkeit der verwendeten Antwortanzahl durchgef{\"u}hrt. Ein n{\"a}herungsweise diffuses K{\"o}rperschallfeld liegt im Beispiel nur in einigen Terzb{\"a}ndern im mittleren Frequenzbereich vor. Damit ist eine Energiebestimmung mit wenigen Antwortpositionen nur dort m{\"o}glich. Die Energiebestimmung {\"u}ber die Schnelle ist bei tiefen Frequenzen f{\"u}r einige Frequenzb{\"a}nder ohne Moden nicht geeignet, da hier die Voraussetzung nicht gegeben ist, dass die kinetische gleich der potenziellen Energie ist. Hochfrequent hat der Krafteinleitungsort bezogen auf die Elementst{\"o}ße Einfluss auf die Antwortstreuungen. Dar{\"u}ber hinaus ist bei tiefen wie auch bei sehr hohen Frequenzen eine hohe Antwortanzahl notwendig.}, language = {de} }