@inproceedings{29894, author = {{Rehlaender, Philipp and Tikhonov, Sergey and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)}}, publisher = {{IEEE}}, title = {{{Dual Interleaved 3.6 kW LLC Converter Operating in Half-Bridge, Full-Bridge and Phase-Shift Mode as a Single-Stage Architecture of an Automotive On-Board DC-DC Converter}}}, doi = {{10.23919/epe20ecceeurope43536.2020.9215736}}, year = {{2020}}, } @article{21558, author = {{Brosch, Anian and Hanke, Sören and Wallscheid, Oliver and Böcker, Joachim}}, issn = {{0885-8993}}, journal = {{IEEE Transactions on Power Electronics}}, pages = {{2179--2190}}, title = {{{Data-Driven Recursive Least Squares Estimation for Model Predictive Current Control of Permanent Magnet Synchronous Motors}}}, doi = {{10.1109/tpel.2020.3006779}}, year = {{2020}}, } @inproceedings{29956, author = {{Stille, Karl Stephan Christian and Weber, Daniel and Lange, Jarren and Vogt, Thorsten and Wallscheid, Oliver and Böcker, Joachim}}, booktitle = {{2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)}}, location = {{Sorrent, Italy}}, publisher = {{IEEE}}, title = {{{Emulation of Microgrids for Research and Validation of Control and Operation Strategies}}}, doi = {{10.1109/speedam48782.2020.9161971}}, year = {{2020}}, } @inproceedings{29896, abstract = {{Automotive DC-DC converters linking the traction battery to the auxiliary battery are characterized by the wide input and output voltage ranges resulting from the varying state-of-charge of the traction and auxiliary battery. The wide voltage transfer ratio needs to be covered for the entire load range conventionally requiring two-stage converter architectures. Considering a less complex single-stage solution potentially enabling cost and weight advantages, traditional LLC converters are unsuitable topologies since it results in a too wide operating frequency range. Most alternative topology candidates show comparable difficulties. To overcome this issue, the gain range of the LLC with full-bridge inverter can be extended by operation in half-bridge mode for low voltage transfer ratios. Phase-shift operation is utilized for intermediate gains and low loads. This paper describes a detailed design methodology for the resonant tank. The experimental results with a peak efficiency of 96.5 % and a power density of 2.1 kW/l prove the proposed concept.}}, author = {{Rehlaender, Philipp and Grote, Tobias and Tikhonov, Sergey and Mario, Schröder and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{PCIM Europe digital days 2020}}, location = {{Nürnberg}}, title = {{{A 3,6 kW Single-Stage LLC Converter Operating in Half-Bridge, Full-Bridge and Phase-Shift Mode for Automotive Onboard DC-DC Conversion}}}, year = {{2020}}, } @inproceedings{29898, abstract = {{An onboard DC-DC converter connects the high voltage traction battery to the low voltage auxiliary battery of an EV. It has to provide power across a wide range of input and output voltages. This paper presents the design and evaluation of an economical two-stage converter concept consisting of a first-stage boost converter and a second-stage LLC converter. While for low input voltages, the boost converter can supply the second-stage LLC with the optimum bulk voltage, for high input voltages, the boost converter is turned off and the LLC regulates the output voltage on its own. Whereas this is unproblematic for high output currents, for low loads high switching frequencies become necessary. For this purpose, the LLC needs to be designed for a wide gain range. Traditionally, this is achieved through a small magnetizing inductance resulting in increased conduction losses. If an asymmetric duty cycle operation is used to cover the low gains at low output current, the LLC can be optimized for a better efficiency. A prototype design proves that the asymmetric duty cycle operation is feasible to achieve a wide gain range at a high efficiency whereas the conventional design achieves very poor efficiencies.}}, author = {{Rüschenbaum, Tobias and Rehlaender, Philipp and Ha, Phuong and Grote, Tobias and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{PCIM Europe digital days 2020}}, title = {{{Two-Stage Automotive DC-DC Converter Design with Wide Voltage-Transfer Range Utilizing Asymmetric LLC Operation}}}, year = {{2020}}, } @inproceedings{29874, abstract = {{LLC resonant converters generally employ MOSFETs in the inverter stage, which can be of half-bridge (HB) or full-bridge (FB) type. The generally weak intrinsic (body) diodes of the MOSFETs cause turn-on losses when being forced to hard current commutations finally leading to the components self-destruction when operated constantly in this way. Consequently, zero-voltage switching (ZVS) operation is more or less essential in a silicon (Si) MOSFET-based HB or FB. To ensure ZVS, the LLC is operated in the inductive region, i.e. with lagging resonant current. On the contrary, IGBTs show dominant turn-off losses and therefore are conventionally not applied in LLCs typically requiring high switching frequencies to achieve low output voltages. Yet, if the LLC is intentionally designed for the capacitive region, i. e. operation with leading current, zero-current switching (ZCS) enabling IGBTs in the inverter stage can be ensured. This paper explores in detail the LLC in the capacitive operating region and gives design considerations for a capacitive LLC utilizing both robust and cost-efficient IGBTs for an exemplary 2.2 kW automotive on-board DC-DC converter application. The results of a loss analysis show that the LLC resonant converter can be operated well in the capacitive region. In the given case, significantly lower overall and 30 % lower inverter stage losses are achieved in the thermally relevant worst-case comparison with an inductive LLC based on Si MOSFETs.}}, author = {{Urbaneck, Daniel and Rehlaender, Philipp and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{PCIM Europe digital days 2020}}, location = {{Nürnberg}}, title = {{{LLC Converter Design in Capacitive Operation utilizes ZCS for IGBTs – a Concept Study for a 2.2 kW Automotive DC-DC Stage}}}, year = {{2020}}, } @article{30033, author = {{Stender, Marius and Wallscheid, Oliver and Böcker, Joachim}}, issn = {{0278-0046}}, journal = {{IEEE Transactions on Industrial Electronics}}, keywords = {{Electrical and Electronic Engineering, Control and Systems Engineering}}, number = {{9}}, pages = {{8646--8656}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Comparison of Gray-Box and Black-Box Two-Level Three-Phase Inverter Models for Electrical Drives}}}, doi = {{10.1109/tie.2020.3018060}}, volume = {{68}}, year = {{2020}}, } @inproceedings{30036, author = {{Stender, Marius and Wallscheid, Oliver and Böcker, Joachim}}, booktitle = {{2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)}}, publisher = {{IEEE}}, title = {{{Accurate Torque Estimation for Induction Motors by Utilizing Globally Optimized Flux Observers}}}, doi = {{10.1109/speedam48782.2020.9161955}}, year = {{2020}}, } @article{29649, author = {{Heid, Stefan and Weber, Daniel and Bode, Henrik and Hüllermeier, Eyke and Wallscheid, Oliver}}, journal = {{Journal of Open Source Software}}, number = {{54}}, pages = {{2435}}, title = {{{OMG: A scalable and flexible simulation and testing environment toolbox for intelligent microgrid control}}}, volume = {{5}}, year = {{2020}}, } @article{29644, author = {{Bode, Henrik and Heid, Stefan and Weber, Daniel and Hüllermeier, Eyke and Wallscheid, Oliver}}, journal = {{arXiv preprint arXiv:2005.04869}}, title = {{{Towards a scalable and flexible simulation and testing environment toolbox for intelligent microgrid control}}}, year = {{2020}}, } @inproceedings{29641, author = {{Gedlu, Emebet Gebeyehu and Wallscheid, Oliver and Böcker, Joachim}}, booktitle = {{The 10th International Conference on Power Electronics, Machines and Drives (PEMD 2020)}}, pages = {{937–942}}, title = {{{Permanent magnet synchronous machine temperature estimation using low-order lumped-parameter thermal network with extended iron loss model}}}, volume = {{2020}}, year = {{2020}}, } @inproceedings{30339, author = {{Ahmmad, Mohsin Ejaz and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM digital days)}}, location = {{Nuremberg, Germany}}, publisher = {{IEEE}}, title = {{{Practical Implementation and Verification of Simple-to-Implement Digital Current Observer for Half-Bridge Topologies}}}, year = {{2020}}, } @misc{30362, author = {{Schafmeister, Frank}}, pages = {{39}}, title = {{{Apparatus and method for charging an electric battery vehicle}}}, year = {{2020}}, } @article{29643, author = {{Wallscheid, Oliver and Ngoumtsa, Etienne Florian Bouna}}, journal = {{IEEE Transactions on Power Electronics}}, number = {{12}}, pages = {{13563–13572}}, publisher = {{IEEE}}, title = {{{Investigation of disturbance observers for model predictive current control in electric drives}}}, volume = {{35}}, year = {{2020}}, } @article{29642, author = {{Hanke, Sören and Wallscheid, Oliver and Böcker, Joachim}}, journal = {{arXiv preprint arXiv:2003.06268}}, title = {{{Data Set Description: Identifying the Physics Behind an Electric Motor–Data-Driven Learning of the Electrical Behavior (Part II)}}}, year = {{2020}}, } @article{29640, author = {{Kirchgässner, Wilhelm and Wallscheid, Oliver and Böcker, Joachim}}, journal = {{arXiv preprint arXiv:2001.06246}}, title = {{{Data-Driven Permanent Magnet Temperature Estimation in Synchronous Motors with Supervised Machine Learning}}}, year = {{2020}}, } @misc{15419, author = {{Sadeghi-Kohan, Somayeh and Hellebrand, Sybille}}, keywords = {{WORKSHOP}}, pages = {{4}}, publisher = {{32. Workshop "Testmethoden und Zuverlässigkeit von Schaltungen und Systemen" (TuZ'20), 16. - 18. Februar 2020}}, title = {{{Dynamic Multi-Frequency Test Method for Hidden Interconnect Defects}}}, year = {{2020}}, } @phdthesis{30853, author = {{Vogt, T.}}, title = {{{Multikriterielle Betriebsstrategien industrieller Microgrids}}}, doi = {{10.17619/UNIPB/1-867}}, year = {{2020}}, } @inproceedings{31873, author = {{Schumacher, Jan}}, publisher = {{LibreCat University}}, title = {{{Deduktion und Abduktion beim diagrammatischen Schließen – das didaktische Potential der Peirceschen Semiotik}}}, doi = {{10.17877/DE290R-21555}}, year = {{2020}}, } @inproceedings{25336, abstract = {{OpenPGP and S/MIME are two major standards for securing email communication introduced in the early 1990s. Three recent classes of attacks exploit weak cipher modes (EFAIL Malleability Gadgets, or EFAIL-MG), the flexibility of the MIME email structure (EFAIL Direct Exfiltration, or EFAIL-DE), and the Reply action of the email client (REPLY attacks). Although all three break message confidentiality by using standardized email features, only EFAIL-MG has been mitigated in IETF standards with the introduction of AEAD algorithms. So far, no uniform and reliable countermeasures have been adopted by email clients to prevent EFAIL-DE and REPLY attacks. Instead, email clients implement a variety of different ad-hoc countermeasures which are only partially effective, cause interoperability problems, and fragment the secure email ecosystem.We present the first generic countermeasure against both REPLY and EFAIL-DE attacks by checking the decryption context including SMTP headers and MIME structure during decryption. The decryption context is encoded into a string DC and used as Associated Data (AD) in the AEAD encryption. Thus the proposed solution seamlessly extends the EFAIL-MG countermeasures. The decryption context changes whenever an attacker alters the email source code in a critical way, for example, if the attacker changes the MIME structure or adds a new Reply-To header. The proposed solution does not cause any interoperability problems and legacy emails can still be decrypted. We evaluate our approach by implementing the decryption contexts in Thunderbird/Enigmail and by verifying their correct functionality after the email has been transported over all major email providers, including Gmail and iCloud Mail.}}, author = {{Schwenk, Jörg and Brinkmann, Marcus and Poddebniak, Damian and Müller, Jens and Somorovsky, Juraj and Schinzel, Sebastian}}, booktitle = {{Proceedings of the 2020 ACM SIGSAC Conference on Computer and Communications Security}}, isbn = {{9781450370899}}, keywords = {{decryption contexts, EFAIL, OpenPGP, S/MIME, AEAD}}, pages = {{1647–1664}}, publisher = {{Association for Computing Machinery}}, title = {{{Mitigation of Attacks on Email End-to-End Encryption}}}, doi = {{10.1145/3372297.3417878}}, year = {{2020}}, }