Jürgen Biela


Last Name

Biela

First Name

Jürgen

ORCID

0000-0001-9099-6486

Organisational unit

03889 - Biela, Jürgen / Biela, Jürgen

Search Results

Publications1 - 10 of 393
  • Single Plastic Optical Fiber, Multiple Channel Data Link for Sensing Applications With PCB Implemented Transmitter and Receiver
    Item type: Journal Article
    Fuchs, Simon; Pritz, Michael; Tsolaridis, Georgios; et al. (2020)
    IEEE Transactions on Circuits and Systems I: Regular Papers
  • Novel High Efficiency Multilevel DC-DC Boost Converter Topologies and Modulation Strategies
    Item type: Conference Paper
    Butti, Gianluca; Biela, Jürgen (2011)
    Proceedings of the 2011 14th European Conference on Power Electronics and Applications
  • Passive and Active Hybrid Integrated EMI Filters
    Item type: Journal Article
    Biela, Jürgen; Wirthmüller, Alexander; Waespe, Roman; et al. (2009)
    IEEE Transactions on Power Electronics
  • Modeling, evaluation, and optimization of a self-bearing spinfilter for bioseparations
    Item type: Journal Article
    Beglinger, Lars; Steinert, Daniel; Nussbaumer, Thomas; et al. (2025)
    Separation and Purification Technology
    Rotating filters promise many advantages for long-term separation processes of complex media such as cell cultures, but have never been commercialized on a large scale due to practical challenges and limited scalability. A bearingless spinfilter circumvents many of the drawbacks, yet additional considerations must be taken into account. Thus, an existing particle-force based model for cross-flow filtration, dependent on the membrane shear rate and the transmembrane pressure, is adapted to the spinfilter and predicts the behavior of retained particles at the membrane. Computational fluid dynamics simulations allow to calculate the shear rate at the membrane for the model. Additionally, with the simulated distribution of the shear rate and the energy dissipation rate within the spinfilter, a prediction of the hydrodynamic stress on cell cultures can be made. The model is verified with a spinfilter prototype on a yeast cell culture and is in good agreement with experimental results. Additional separation experiments with bovine blood serve to indicate the extent of cell damage induced by hydrodynamic stress within the spinfilter. The results demonstrate that operating the spinfilter at the optimum operation point leads to a faster separation process at a lower level of cell damage per volume of filtrate in comparison to a passive tangential flow filtration in hollow fibers.
  • Analytical Capacitance Calculation for Transformers with Grounded Core
    Item type: Conference Paper
    Korthauer, Bastian; Biela, Jürgen (2022)
    2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)
    Silicon carbide (SiC) semiconductors enable more and more medium voltage (MV) applications, but their fast switching transients lead to undesired effects as e.g. oscillations in transformer windings due to parasitic capacitances. In order to consider these effects/parasitics in the design process, this paper presents an analytical model of the electric energy/capacitance per unit length within the winding window of foil-wound transformers. The model is based on calculating the electrical energy within basic regions using Schwarz-Christoffel (SC) transformations. It also considers the potential distribution introduced by the voltage-drop between different turns and achieves an error below 3% compared to FEM simulations. The model can be used for calculating comprehensive lumped element equivalent circuits and is based on computationally efficient analytical equations.
  • Output Voltage Ripple Analysis for Modular Series Parallel Resonant Converter Systems with Capacitive Output Filter
    Item type: Conference Paper
    Jaritz, Michael; Biela, Jürgen (2018)
    2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)
  • Comparison of Hybrid Transformers with Uni- and Bidirectional Auxiliary Converter
    Item type: Conference Paper
    Wiemer, Adrian; Biela, Jürgen (2019)
    2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)
    Hybrid transformers (HT) are a promising concept to increase the grid flexibility. In the past, only HT with bidirectional auxiliary converter have been investigated. In this paper, HT with unidirectional auxiliary converter, which are advantageous in terms of reliability, cost and complexity, are investigated and their operational limits are derived.
  • Modelling and Design Optimisation of a High Bandwidth and High Precision Optical Current Sensor Based on the Faraday Effect
    Item type: Conference Paper
    Rietmann, Stefan; Schlesinger, Richard; Biela, Jürgen (2021)
    2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)
    A magneto-optical current measurement system based on the Faraday effect is evaluated for measuring fast pulse currents in high power applications. The current measurement system is based on the interaction of the magnetic field, generated by the current, and a beam of light propagating through magneto-optical material which is in close proximity to the current conductor. A high local magnetic field per ampère current inside the optical path is required to improve the accuracy and the sensitivity of the optical current measurement sensor.In this paper, the relation between the conductor geometry and the local magnetic field distribution is analytically modelled resulting in the geometry factor Kg. The analytical model enables an optimisation of the busbar geometry to increase the overall probe sensitivity and the accuracy of the optical current measurement system.
  • Vorrichtung zur Erzeugung von Hochenerergieimpulsen zur Bearbeitung von Gestein
    Item type: Patent
    Biela, Jürgen; Kolar, Johann W.; Bortis, Dominik; et al. (2012)
    Vorrichtung (1) zum Fräsen und Bohren von Gestein mit Hochenergiepulsen: Ein Pulskondensator (2) wird geladen und dessen Spannung über einen elektronischen Leistungsschalter (9) an eine Zündvorrichtung (14) und damit an die Primärwicklung (31) eines Zündtransformators (27) gelegt. Über dessen Sekundärwicklung (33) tritt sprungförmig eine hohe Spannung auf, welche eine Schwingung eines nachgeordneten, aus einer Serieninduktivität (28) und einer Parallelkapazität (29) gebildeten Schwingkreises anregt. Die Spannung über der Parallelkapazität (29) erreicht so nach einer Schwingungshalbperiode den zweifachen Wert der Sekundärspannung und wird dann über Sättigung einer Zündspannungsstufendrossel (20) an eine erste Elektrode (18) gelegt und so eine Entladung im Gestein zur zweiten Elektrode (21) gezündet. Über den elektronischen Leistungsschalter (9) kann dann über eine Entladestromzuführung (12) ein hoher Entladestrom fliessen und eine hohe Energie in das Gestein eingebracht werden, welche zum Abtrag von Material führt. Nach Entladung des Pulskondensators (2) wird der elektronische Leistungsschalter (9) wieder gesperrt.
  • High precision, low ripple 3kV capacitor charger
    Item type: Conference Paper
    Blume, Sebastian; Gerber, Dominic; Biela, Jürgen (2017)
    2016 IEEE International Power Modulator and High Voltage Conference (IPMHVC)
Publications1 - 10 of 393