Veröffentlichungen

Design parameters impact on electrical characteristics of 4H-SiC thyristors with etched junction termination extension,
Kotra, K.; Scharnholz, S.; Hassdorf, R.; Zuvic, M.; Hoffmann, K. F.,
International Conference on Silicon Carbide and Related Materials (ICSCRM 2024), 29. September – 04. Oktober 2024, Raleigh, NC, USA

Optimizing Control Strategies for High Power Capacitor Chargers with a SiC-based LC-resonant Topology,
Haag, F.; Berard, M.; Brommer, V.; Liebfried, O.; Hoffmann, K. F.,
EAPPC-BEAMS-EML Conference 2024, 22.-26. September 2024, Amsterdam

Investigation of Supercapacitors as Energy Source for Compact Inductive Pulsed-Power Generators,
Albrecht, F.; Berard, M.; Brommer, V.; Liebfried, O.; Hoffmann, K. F.,
EAPPC-BEAMS-EML Conference 2024, 22.-26. September 2024, Amsterdam

The influence of anisotropy in wide-bandgap 4H-SiC on the thyristor breakdown voltage and its junction termination extension design, 
Kotra, K.; Scharnholz, S.; Hassdorf, R.; Zuvic, M.; Hoffmann, K. F.,
European Materials Research Society Conference (E-MRS),
16.-19. September 2024, Warsaw, Poland

Generation of an Isolated Auxiliary Voltage within a High Voltage Application of an MMC Cell,
Ghosh, P.; Meissner, M.; Hoffmann, K. F.; Marquardt, R.,
ECCE Europe Conference 2024, 02.-06. September 2024, Darmstadt

Analysing the Influence of a High Number of Short Circuit Events on the Device Parameters of 1200V SiC-MOSFETs,
Rasch, M.; Brandt, S.; Wanagat, T.; Hoffmann, K. F.,
ECCE Europe Conference 2024, 02.-06. September 2024, Darmstadt

A Non-Isolated Cascaded Buck-Boost Converter with Improved Voltage Balancing with Respect to Ground and Reduced Common Mode Noise,
Fritze, E.; Meissner, M.; Hoffmann, K. F.,
ECCE Europe Conference 2024, 02.-06. September 2024, Darmstadt

Influencing the Ripple Current of a Buck Converter Using an Orthogonal Field Coupled Current Controlled Adjustable Inductance,
Schierle, G.; Meissner, M.; Hoffmann, K. F.,
ECCE Europe Conference 2024, 02.-06. September 2024, Darmstadt

Conducted Emissions of an upto 2.3 kW Interleaved SiC Buck Converter under Varied Operative Conditions,
Kulkarni, S.; Brandt, S.; Wendt, M.; Hoffmann, K. F.; Kampert, E.; Dickmann, S.,
EMC Europe 2024, 02.-05. September 2024, Bruges, Belgien

An EMC-Investigation on Dead Time Distortion of SiC Based Half Bridge LLC Resonant Inverter,
Sankar, M.; Podendorf, S.; Hoffmann, K. F.; Dickmann, S.,
EMC Europe 2024, 02.-05. September 2024, Bruges, Belgien

Conducted EMI from GaN-based 48 V to 12 V DC-DC Converters for Automotive Applications,
Wendt, M.; Kampert, E.; Wendt, J.; Hoffmann, K. F.; Dickmann, S.,
Power Conversion and Intelligent Motion Conference – PCIM 2024, 11.-13. Juni 2024, Nürnberg

Galvanically Isolated Power Supply for Gate Drivers in High Voltage Applications,
Ghosh, P.; Meissner, M.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2024, 11.-13. Juni 2024, Nürnberg

Fault-Tolerant Operation Analysis of a Five-Phase Three-Level TNPC Inverter for Electric Aircraft Propulsion Systems,
Chaisakdanugull, C.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2024, 11.-13. Juni 2024, Nürnberg

Characterisation of 1200 V SiC-MOSFETs – Influence of Repetitive Short-Circuit Events on Device Parameters,
Brandt, S.; Rasch, M.; Wanagat, T.; Hoffmann, K. F.,
CIPS 2024 – 13th International Conference on Integrated Power Electronics Systems, 11.-14. März 2024, Düsseldorf

Simulation of Resonances in Power Electronic Circuits for EMC Prediction,
Podendorf, S.; Rathjen, K.-U.; Landskron, N.; Brandt, S.; Hoffmann, K. F.; Dickmann, S.,
International Symposium on Electromagnetic Compatibility – EMC Europe, 04.-08. September, Krakow, Polen

A Robust and Effective Control Method for the Cascaded Buck-Boost Converter Using a Single Controller,
Fritze, E.; Mirea, B.-A.; Hoffmann, K. F.; Woywode, O.,
European Conference on Power Electronics and Applications – EPE 2023, 04.-08. September 2023, Aalborg

Analysis of Material Mixtures for the Characteristics of a Field Coupled Current Controlled Adjustable Inductance,
Schierle, G.; Meissner, M.; Saß, H.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2023, 04.-08. September 2023, Aalborg

Reduction of SiC-MOSFET Switching Oscillations during Double Pulse Measurements,
Podendorf, S.; Rathjen, K.-U.; Landskron, N.; Brandt, S.; Dickmann, S.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2023, 09.-11. Mai 2023, Nürnberg

Effects of the DC-Link Voltage on the Efficiency of a 3.3kV-Si-SiC-Topology-Hybrid-Switch,
Meissner, M.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2023, 09.-11. Mai 2023, Nürnberg

Dynamic Characterisation of 1200V-SiC-MOSFETs for High Current Applications in TO247-4-Packages,
Brandt, S.; Meissner, M.; Fehrenbach, D.;  Rasch, M.; Hoffmann, K. F., Wagner, B.,
Power Conversion and Intelligent Motion Conference – PCIM 2023, 09.-11. Mai 2023, Nürnberg

Experimental Analysis of the Temperature Dependency of an Orthogonal Field-Coupled Current Controlled Adjustable Inductance,
Schierle, G.; Meissner, M.; Saß, H.;  Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2023, 09.-11. Mai 2023, Nürnberg

A Transfer Function Approach to Calculate the Radiation of a three-phase Inverter,
Engeln, A.; Rathjen, K.-U.; Fritze, E.; Hoffmann, K. F.; Dickmann, S.,
2022 International Symposium on Electromagnetic Compatibility – EMC EUROPE,  05.-08. September 2022, Göteborg

Optimization and Scaling of a Compact High-Power IGCT Capacitor Charger Based on Simulation and Measurements with a 300 kW/3.3 kV Demonstrator,
Haag, F.; Albrecht, F.; Brommer, V.; Liebfried, O.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2022, 05.-09. September 2022, Hannover

Analysis and Discussion of a Concept for an Adjustable Inductance Based on an Impact of an Orthogonal Magnetic Field, Schierle, G.; Meissner, M.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2022, 05.-09. September 2022, Hannover

Analysis and Discussion of Different Three-Phase dv/dt Filter Topologies and the Influences of Their Filter Parameters on Losses and EMC,
Fritze, E.; Meissner, M.; Hoffmann, K. F.; Rathjen, K.; Dickmann, S.; Woywode, O.,
European Conference on Power Electronics and Applications – EPE 2022, 05.-09. September 2022, Hannover

Non-Linear Effects of Operation Temperature on a Field-Coupled Current-Controlled Inductance,
Schierle, G.; Meissner, M.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPNC 2022, 28. Juni-01. Juli 2022, Hamburg

The Relevance of Boundary Conduction Mode for High Pulse Power DC-DC Converters Using GCTs and IGCTs,
Albrecht, F.; Haag, F.; Brommer, V.; Hoffmann, K. F.; Liebfried, O.,
Power Conversion and Intelligent Motion Conference – PCIM 2022, 10.-12. Mai 2022, Nürnberg

Capacitance- and Thermally-Wise Optimized Transformers,
Dietmann, C.; Bödeker, C.; Meissner, M.; Landskron, N.; Appel, T.; Benner, D.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2022, 10.-12. Mai 2022, Nürnberg

A Survey on Adjustable Inductances for Power Electronic Circuits,
Brandt, S.; Meissner, M.; Polap, N.; Schierle, G.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2022, 10.-12. Mai 2022, Nürnberg

Digitally Adjustable Gate Resistor Concept for Automated and Time-Saving Gate-Resistor Selection – Improvement by Reduction of Parasitic Inductances,
Meissner, M.; Meyer Herrmann, A.; Landskron, N.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2022, 10.-12. Mai 2022, Nürnberg

SiC-Si-Hybridschalter in resonant-schaltenden Topologien mit 1,2 kV- und 3,3 kV-Bauelementen,
Meissner, M.; Referent: Hoffmann, K. F.; Korreferent: Dickmann, S.,
Dissertation, Helmut-Schmidt-Universität, Oktober 2021, Hamburg

3.3kV-Silicon-Silicon Carbide-Topology-Hybrid-Switch for High Power Resonant ZVS Inverters – Optimisation of the Power Losses,
Meissner, M.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2021, 6.-10. September 2021, digitale Konferenz

Benchmarking and Efficiency Analysis of State-Of-The-Art 200 V Diode Technologies Under Fast Switching Conditions,
Aneissi, A.; Meissner, M.; Hoffmann, K. F.; Behtash, R.; Fahlbusch, S.; Fischer, J.,
Power Conversion and Intelligent Motion Conference – PCIM 2021, 3.-7. Mai 2021, digitale Konferenz

Analysis of Approaches for Reduction of the Parasitic Capacitances in Transformers with Copper Foil Windings for Fast Switching Applications,
Bödeker, C.; Meissner, M.; Dietmann, C.; Appel, T.; Benner, D.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2021, 3.-7. Mai 2021, digitale Konferenz

Analysis of a 3.3kV-Si-SiC-Topology-Hybrid-Switch for Resonant ZVS Inverter Applications,
Meissner, M.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2021, 3.-7. Mai 2021, digitale Konferenz

Performance of a Low-Budget, High Precision Calorimetric System for Measuring Power Losses in Power Electronics Components and Circuits,
Tenzer, F.; Bröcker, F.; Landskron, N.; Meissner, M.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2021, 3.-7. Mai 2021, digitale Konferenz

Analysis of Surface Mount Heat Sinks for SiC MOSFETs Concerning Heat Dissipation and EMC Behaviour,
Fritze, E.; Zey, L.; Hoffmann, K. F.; Rathjen, K.; Dickmann, S.; Woywode, O.,
Power Conversion and Intelligent Motion Conference – PCIM 2021, 3.-7. Mai 2021, digitale Konferenz

Efficiency and Robustness Analysis of a Novel SiGe Diode Utilized in a High Frequency 48V/12V DC/DC Converter,
Aneissi, A.; Meissner, M.; Klötzer, S.; Hoffmann, K. F.; Behtash, R.; Fahlbusch, S.; Fischer, J.,
Power Conversion and Intelligent Motion Conference – PCIM 2020, 16.-18. November 2020, digitale Konferenz

Messsystem zur Charakterisierung von Leistungsspulen auf Basis eines 15-Level-Siliziumkarbid-Wechselrichters,
Fahlbusch, S.; Referent: Hoffmann, K. F.; Korreferent: Dickmann, S.,
Dissertation, Helmut-Schmidt-Universität, Oktober 2020, Hamburg

Benchmarking of a Novel SiGe Diode Technology for the Usage in High Frequency 48V / 12V Converter Applications,
Aneissi, A.; Meissner, M.; Hoffmann, K. F.; Behtash, R.; Fischer, J.; Fahlbusch, S.,
Power Conversion and Intelligent Motion Conference – PCIM 2020, 7.-8. Juli 2020, digitale Konferenz

Investigation of Extended IGBT Desaturation in the Context of a Si SiC Hybrid Switch for Inverters with Resonant Load,
Meissner, M.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2020, 7.-8. Juli 2020, digitale Konferenz

Analysis of Power Losses within a SiC-MOSFET-Inverter with Passive dv/dt-Damping Network for Reduced Voltage slopes at Inductive Loads,
Bröcker, F.; Hoffmann, K. F.; Solmecke, H.; Grimmig, M.,
Power Conversion and Intelligent Motion Conference – PCIM 2020, 7.-8. Juli 2020, digitale Konferenz

Determining Crucial Sources of Conducted Interference in Power Electronics from Heat Sink Capacitive Coupling,
Fink, S.; Hoffmann, K. F.; Dickmann, S.,
International Symposium on Electromagnetic Compatibility – EMC EUROPE, 2.-6. September 2019, Barcelona

Modular Silicon Carbide Inverter for Drive Applications with High Voltage Slopes – Challenges Concerning Conducted EMC,
Bröcker, F.; Andres, P. J.; Hoffmann, K. F.; Solmecke, H.; Grimmig, M.,
European Conference on Power Electronics and Applications – EPE 2019, 2.-6. September 2019, Genua

Analysis of a 1200 V SiC-Si-Hybrid Switch for Resonant Applications with Consideration of Bipolar Desaturation,
Meissner, M.; Sauermann, L.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2019, 2.-6. September 2019, Genua

Analysis of an LLC Converter with Planar Inverse Coupled Current Doubler Rectifier using Silicon and GaN devices,
Klötzer, S.; Thielke, F.; Warncke, M.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2019, 2.-6. September 2019, Genua

Analysis and Optimization of an Inverse Coupled Inductor in a High Frequency LLC Converter with Current Doubler Rectifier,
Klötzer, S.; Warncke, M.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2019, 7.-9. Mai 2019, Nürnberg

Digitally Adjustable Gate Resistor Concept for Automated and Time-Saving Switching Characterisation of Power Seminconductors,
Meissner, M.; Fahlbusch, S.; Likpe, T.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2019, 7.-9. Mai 2019, Nürnberg

Conducted EMC Emission of a PWM Full Bridge Inverter Using Silicon Carbide MOSFETs in High Temperature Environments,
Bröcker, F.; Hoffmann, K. F.; Solmecke, H.; Grimmig, M.,
Power Conversion and Intelligent Motion Conference – PCIM 2019, 7.-9. Mai 2019, Nürnberg

Reducing EMC Problems Caused by Power Semiconductors Using an Electrically Non-Conducting Heat Sink,
Chromy, S.; Fahlbusch, S.; Hoffmann, K. F.; Dickmann, S.,
2018 IEEE International Symposium on Electromagnetic Compatibility 2018-August, pp. 625-629

Influence of an Electrically Non-Conductive Heat Sink on Radiated and Line-Conducted Interferences of Power Semiconductors,
Chromy, S.; Dickmann, S.; Fahlbusch, S.; Hoffmann, K. F.; Rathjen, K.,
EMV 2018 – Internationale Fachmesse und Kongress für Elektromagnetische Verträglichkeit 2018-February, pp. 644-651

Thermal Analysis of a Directly Liquid Cooled Silicon Carbide Resonant Inverter for High Voltage Generation,
Müter, U.; Woywode, O.; Radvan, J.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2018, 5.-7. Juni 2018, Nürnberg

A SiC-Based 15-Level Power Inverter for the Generation of Variable High Frequency Output Voltages,
Fahlbusch, S.; Meissner, M.; Klötzer, S.; Bröcker, F.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2018, 5.-7. Juni 2018, Nürnberg

Compact Bidirection GaN Buck-Boost Converter for Negative Rail Supply in Bipolar DC-Grids,
Klötzer, S.; Fahlbusch, S.; Müter, U.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2018, 5.-7. Juni 2018, Nürnberg

Analysis of 1200 V Si-SiC-Hybrid Switches for Resonant Applications,
Meissner, M.; Fahlbusch, S.; Lüthke, D.; Klötzer, S.; Bröcker, F.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2018, 5.-7. Juni 2018, Nürnberg

Simulation of the Thermal Transient Behaviour of Silicon Carbide Modules Using Liquid Convection Cooling,
Müter, U.; Radvan, J.; Richter, S.; Hoffmann, K. F.,
International Conference on Integrated Power Electronics – CIPS 2018, 20.-22. März 2018, Stuttgart

Untersuchung von hybriden Filtersystemen – Reduktion von Oberschwingungen in Spezialanwendungen der Leistungselektronik,
Bergmann, J., Referent: Hoffmann, K. F., Korreferent: Zölzer, U.,
Dissertation, Helmut-Schmidt-Universität 2017, Hamburg

Compact 80kW Silicon Carbide High Voltage Generator,
Müter, U.; Wagner, B.; Lunding, A.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2017, 10.-14. September 2017, Warschau

DC/DC-Converter for Fuel Cell Integration in More Electric Aircraft Applications,
Warncke, M.; Fahlbusch, S.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2017, 10.-14. September 2017, Warschau

Highly Integrated Silicon Carbide 80 kW Resonant Inverter for High Voltage Generation Switching at 500 kHz,
Müter, U.; Lunding, A.; Wagner, B.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2017, 16.-18. Mai 2017, Nürnberg

Reliability Investigation on SiC based Diode and MOSFET Modules Developed for High Power Conversion in
Medical X-Ray Applications,
Otto, A.; Dudek, R.; Rzepka, S.; Abo Ras, M.; von Essen, T.; Bast, M.; Müter, U.; Lunding, A.,
Power Conversion and Intelligent Motion Conference – PCIM 2017, 16.-18. Mai 2017, Nürnberg

Novel Gate Driver Technology for the Series Connection of Power Semiconductors,
Kemper J.; Fiedler B.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2017, 16.-18. Mai 2017, Nürnberg

Automated Test Bench for the Measurement of Si-IGBT and SiC-MOSFET Hybrid Switches,
Meissner, M.; Fahlbusch, S.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2017, 16.-18. Mai 2017, Nürnberg

DC/DC-Converter with Optimised Power Density for Integration of Multifunctional Fuel Cell Systems in Modern Aircraft Application,
Warncke, M.; Fahlbusch, S.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2017, 16.-18. Mai 2017, Nürnberg

Compact Diode-less Bidirectional GaN Based Buck Converter for Mobile DC-DC Applications,
Klötzer, S.; Müter, U.; Fahlbusch, S.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2017, 16.-18. Mai 2017, Nürnberg

Dual On-State Gate Driver Concept for Improved Drive of Silicon Carbide MOSFETs,
Fahlbusch, S.; Fisahn, F.; Meissner, M.; Müter, U.; Klötzer S.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2017, 16.-18. Mai 2017, Nürnberg

Berechnung der Lichtausbeute von LED-Lampen – Sind 300 Lumen pro Watt erreichbar?
Jaschke, R.,
34. ANSYS SIMULATION CONFERENCE, 05.-07. Oktober 2016, Nürnberg

The Standby Power of Low Power Equipment Must be Reduced Under 100 Milliwatt,
Jaschke, R.,
Conference on Sustainable Energy Supply and Energy Storage Systems – NEIS 2016,
15.-16. September 2016, Hamburg,

A Novel Control Concept for High-Efficiency Power Conversion with the Bidirectional Non-Inverting Buck-Boost Converter,
Yu, Z.; Kapels, H.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2016, 5.-9. September 2016, Karlsruhe

Comparison of Driving Concepts for Silicon Carbide Bipolar Junction Transistors,
Müter, U.; Sammler, C.; Fahlbusch, S.; Klötzer, S.; Hoffmann, K. F.,
European Conference on Power Electronics and Applications – EPE 2016, 5.-9. September 2016, Karlsruhe

Efficiency And Inrush Current in Low Power Equipment at AC-Grid,
Jaschke, R.,
CPE-POWERENG 2016, 6th International Conference on Power Engineering, Energy and Electrical Drives 10th International Conference on Compatibility and Power Electronics, 29. June-1. July 2016, Bydgoszcz, Poland

In-Rush Current From LED Lamps Can Destroy Switches at AC Grid,
Jaschke, R.,
Automotive Simulation World Congress + ANSYS Electronics Simulation Expo, ASWC & AESE 2016,
7.-8. June 2016, Munich

Extreme High Efficiency Non-Inverting Buck-Boost Converter for Energy Storage Systems,
Yu, Z.; Kapels, H.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2016, 10.-12. Mai 2016, Nürnberg

Comparison of Unipolar Silicon Carbide Power Transistors Used in High Switching Frequency Inverter Topologies,
Fahlbusch, S.; Sahli, N.; Klötzer, S.; Müter, U.; Schäning, B.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2016, 10.-12. Mai 2016, Nürnberg

Higher Light Efficacy in LED-Lamps by Lower LED-Current,
Jaschke, R.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2016, 10.-12. Mai 2016, Nürnberg

Dual-Side Ceramic Power Module for Fast Switching Silicon Carbide Transistors,
Müter, U.; Lürkens, P.; Garcia i Tormo, A.; Bast, M.; Hoffmann, K. F.; Eisele, R.,
9th International Conference on Integrated Power Electronics Systems – CIPS 2016,
08.-10. März 2016, Nürnberg

Lifetime Analysis of IGBTs in Periodic Surge Current Operation,
Kemper, J.; Nevoigt, J.; Hübner, H.; Hoffmann, K. F.,
9th International Conference on Integrated Power Electronics Systems – CIPS 2016,
08.-10. März 2016, Nürnberg

Hochfrequent getaktete Multi-Level-Wechselrichter zur Gleichspannungswandlung,
Düerkop, C., Referent: Hoffmann, K. F., Korreferent: Eckel, H.-G.,
Dissertation, Shaker-Verlag, 2015

Wirkungsgrad und Energieeffizienz-Kennzeichnung für LED Lampen,
Jaschke, R.,
Conference on Sustainable Energy Supply and Energy Storage Systems – NEIS 2015,
10.-11. September 2015, Hamburg, Germany

Better Efficiency with Linear-Regulator compared to Flyback-Converters in LED Lamps at AC Grids,
Jaschke, R.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM Asia 2015, 24.-26. June 2015,
Shanghai, China

High Efficiency Bidirectional DC-DC Converter with Wide Input and Output Voltage Ranges for Battery Systems,
Yu, Z.; Kapels, H.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2015, 19.-21. Mai 2015, Nürnberg

Analysis of SiC-MOSFETs Utilised in Hard Switching Inverter Topologies with Switching Frequencies up to 1 MHz,
Fahlbusch, S.; Müter, U.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2015, 19.-21. Mai 2015, Nürnberg

Better Line Current by LED Lamps less 25 Watt Equipped with a Six Diode Valley Fill Topologie,
Jaschke, R.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2015, 19.-21. Mai 2015, Nürnberg

Wirkungsgrad von Stromversorgungen in LED-Lampen: Linearregler gegenüber Schaltreglern am AC-Netz,
Jaschke, R.,
Ansys Electronics Simulation Conference AESC 2015, 10.-11. Februar 2015, München

Reduzierung der Netz- Oberschwingungsströme durch modifizierte Stromversorgungen für LED Lampen kleiner 25W,
Jaschke, R.,
Konferenz für Nachhaltige Energieversorgung und Integration von Speichern – NEIS 2014,
18.-19. September 2014, Hamburg

Netz-Oberschwingungen in LED-Lampen-Stromversorgungen,
Jaschke, R.,
Ansys Conference & 32. CADFEM Users‘ Meeting 2014, 4.-6. Juni 2014, Nürnberg

Half Current Line Stress by LED Lamps Less 25W Equipped With a Simple Nonlinear Passive PFC,
Jaschke, R.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2014, 20.-22. Mai 2014, Nürnberg

Analysis of Hybrid MOSFET/IGBT Switches Utilized in High Frequency Resonant Converters,
Bergmann, J.; Hoffmann, K. F.; Bröcker, F.,
Power Conversion and Intelligent Motion Conference – PCIM 2014, 20.-22. Mai 2014, Nürnberg

Echtzeitsimulation von Wechselrichtern in PV-Kraftwerken,
Kempen, S.; Klötzer, S.; Hoffmann, K. F.,
ETG-Kongress 2013; Energieversorgung auf dem Weg nach 2050, 5.-6. November 2013, Berlin

Designanforderungen von brennstoffzellengespeisten DC/DC-Wandlern für Luftfahrtapplikationen,
Warncke, M.; Kut, T.; Lücken, A.; Hoffmann, K. F.; Dickmann, S.; Schulz, D.,
Konferenz für Nachhaltige Energieversorgung und Integration von Speichern – NEIS 2013,
12.-13. September 2013, Hamburg

Übersicht über derzeit verwendete Verfahren zur Qualifizierung und Beurteilung von Hochspannungs-Energiekabel,
Kemper, J.; Bergmann, J.; Hoffmann, K. F.,
Konferenz für Nachhaltige Energieversorgung und Integration von Speichern – NEIS 2013,
12.-13. September 2013, Hamburg

Höhere Energie-Effizienz bei LED-Licht-Anwendungen durch Kompensation der negativen LED- Temperaturkoeffizienten,
Jaschke, R.,
Konferenz für Nachhaltige Energieversorgung und Integration von Speichern – NEIS 2013,
12.-13. September 2013, Hamburg

Hocheffizienter DC/DC-Wandler zur leistungselektronischen Kopplung von Energiespeichern,
Yu, Z.; Hoffmann, K. F.; Kapels, H.,
Konferenz für Nachhaltige Energieversorgung und Integration von Speichern – NEIS 2013,
12.-13. September 2013, Hamburg

Control of a Hybrid Filter Topology for a Reduction of High Frequency Harmonics,
Bergmann, J.; Hoffmann, K. F.; Gleich, B.; Woywode, O.,
International Workshop on Magnetic Particle Imaging (IWMPI), 2013, Berkeley, USA

Konstantes LED-Licht durch Kompensation der negativen LED-Temperaturkoeffizienten,
Jaschke, R.,
Ansys Conference & 31. CADFEM Users‘ Meeting 2013, 19.-21. Juni 2013, Mannheim

Simulation of Utility Scale PV Power Plants,
Kempen, S.; Noack, H.;  Klötzer, S.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2013, 14.-16. Mai 2013, Nürnberg

Increased Coil-Capacitance for Zero-Voltage-Switching in Resonant-Converters,
Jaschke,R.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2013, 14.-16. Mai 2013, Nürnberg

A Five-Level High Frequency Zero-Voltage-Switching Neutral-Point-Clamped Inverter for Energy Transfer with Resonant Tank,
Düerkop, C.;  Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM 2013, 14.-16. Mai 2013, Nürnberg

Einfluss der parasitären Spulenkapazitäten in Wechselrichtern von Kompaktleuchtstofflampen,
Jaschke, R.,
Ansys Conference & 30. CADFEM Users‘ Meeting 2012, 24.-26. Oktober 2012, Kassel

A Hybrid Filter Topology For A Reduction Of High Frequency Harmonics,
Bergmann, J.; Hoffmann, K. F.; Gleich, B. ; Woywode, O.,
International Workshop on Magnetic Partice IMaging (IWMPI), 2012, Lübeck

Verringerung der Störströme eines Kühlkörpers durch Filterung,
Kulanayagam, J.; Hagmann, J.; Hoffmann, K. F.; Dickmann, S.,
EMV-Konferenz, S. 299-307, 2012, Düsseldorf

Numerical modeling for heatsink emissions in power electronics,
Kulanayagam, J.; Hagmann, J.; Schenke, S.; Hoffmann, K. F.; Dickmann, S.,
Advances in Radio Science 10, S. 239-243, 2012, Miltenberg

Lichtflickern durch Strom- und Spannungsschwankungen bei modernen Leuchtmitteln nach dem Verbot der Glühlampe,
Jaschke, R.,
Ansys Conference & 29. CADFEM Users‘ Meeting 2011, 19.-21. Oktober 2011, ICS Stuttgart

Comparsion of Different Zero-Voltage-Switching Neutral-Point-Clamped Inverter Topologies with Resonant Tank,
Düerkop, C.;  Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference- PCIM 2011, 17.-21. Mai 2011, Nürnberg

15-Level Power Inverter Topology for Generating High-Frequency Output Voltage with Low Harmonics,
Bergmann, J.; Düerkop, C.; Kemper, J.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference- PCIM 2011, 17.-21. Mai 2011, Nürnberg

Influence of Parasitic Inductances on the Snubber Current Commutation in Resonant ZVS-Inverters,
Hoffmann, K. F.; Mißfeldt, W.,
Power Conversion and Intelligent Motion Conference- PCIM 2011, 17.-21. Mai 2011, Nürnberg

Simulation Tool for the Design of Resonant Power Inverter Topologies,
Schäf, C.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference- PCIM 2011, 17.-21. Mai 2011, Nürnberg

Filter Design for the Reduction of Heat Sink Noise Currents in Power Electronics,
Kulanayagam, J.; Kut, T.; Hoffmann, K. F.; Dickmann, S.,
EMC Europe, York 2011, S. 607-610, 2011, York

Reduction of Heat Sink Common Mode Currents in Switching Mode Power Supply Circuits,
Kulanayagam, J.; Hagmann, J.; Hoffmann, K. F.; Dickmann, S.,
Advances in Radio Science 9, S. 317-321, 2011, Miltenberg

New Efficient Filter Design for a Heat Sink,
Kulanayagam, J.; Hagmann, J.; Hoffmann, K. F.; Dickmann, S.,
ICREPQ 2011, 2011, Las Palmas

VDE-Studie – Elektrofahrzeuge, Bedeutung, Stand der Technik, Handlungsbedarf,
Böcker, J.; Bösing, M.; Bredehorn, M.; Canders, W.; Cebulski, B.; Doetsch, P.; De Doncker, R.; Kashani, O.; Friedrich, B.; Grube, T.; Hameyer, K.; Hennen, M.; Hoffmann, K. F.; Hofmann, W.; Iles, D.; Kreim, A.; Lunz, B.; Lutz, J.; März, M.; Mertens, A.; Neef, C.; Peters, W.; Rehtanz, C.; Rolinkj, J.; Sauer, D.; Schäfer, U.; Schäfer, H.; Schäfer, T.; Schmülling, B.; Schöning, M.; Stolten, D.; van Treek, D.; Wermuth, M.; Wittler, M.; Wirth, R., 2010

Ist die Rücklaufleistung in DC-DC-Stellern gleich der Blindleistung?
Jaschke, R.,
ANSYS Conference & 28. CADFEM Users‘ Meeting, 3.-5. November 2010, Aachen Eurogress

Analysis and Simulation of Series-Parallel-Inverter Topologies,
Schäf, C.; Düerkop, C.; Hoffmann, K. F.,
Second IEEE Germany Student Conference, 2010, Hamburg

Analysis of Zero-Voltage-Switching Conditions in Multi-Level Inverter with Resonant Tank,
Düerkop, C.; Bergmann, J.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference- PCIM, 4.-6. Mai 2010, Nürnberg

Superjunction MOSFET’s Utilized in Resonant ZVS-Inverters for Higher Frequencies- Analysis of the Inverse Diodes,
Hoffmann, K. F.; Mißfeldt, W.,
Power Conversion and Intelligent Motion Conference- PCIM, 4.-6. Mai 2010, Nürnberg

Conduction Losses in DC/DC-Converters as buckboost/boostbuck synchronous
rectifier types,
Jaschke, R.,
CPE 2007 (Compatibility in Power Electronics), 2007, Gdansk

Zum Parallelbetrieb von uni- und bipolaren Leistungshalbleitern – Anwendungsbereiche, Durchlass- und Schaltverhalten,
Hoffmann, K. F.; Kärst, J. P.,
5. ETG Fachtagung des VDE-Bauelemente der Leistungselektronik und ihre Anwendungen, 10.-11. Oktober 2006, Bad Nauheim

Reduced IGBT Conducting Power Losses by Miller Effect Triggered Gate Current Injection,
Hoffmann, K. F.; Kärst, J. P.; Rexhausen, W.,
Power Conversion and Intelligent Motion Conference-PCIM, 29.-31. Mai 2006, Nürnberg

Evaluation of EMI Filter topologies for Hard- and Soft-Switching Voltage Source Converters,
Kärst, J. P.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference-PCIM, 29.-31. Mai 2006, Nürnberg

High Frequency Power Switch-Improved Performance by MOSFETs and IGBTs Connected in Parallel,
Hoffmann, K. F.; Kärst, J. P.,
Proceedings of 11th European Conference on Power Electronics and Applications-EPE, Beitrags-Nr. 646 (CD-ROM), 2005, Dresden

High Speed Complementary Drive of a Hybrid MOSFET and IGBT Power Switch,
Kärst, J. P.; Hoffmann, K. F.,
Proceedings of 11th European Conference on Power Electronics and Applications-EPE, Beitrags-Nr. 685 (CD-ROM), 2005, Dresden

Miniaturised Rogowski coils for high frequency current measurement in power electronics,
Jaschke, R.,
Power Conversion and Intelligent Motion Conference-PCIM (CD-ROM), 7.-9. Juni 2005, Nürnberg

Paralleling of MOSFETs and IGBTs in ZVS Inverter with Resonant Load,
Hoffmann, K. F.; Kärst, J. P.,
Power Conversion and Intelligent Motion Conference-PCIM (CD-ROM), S. 991-996, 7.-9. Juni 2005, Nürnberg

Design Rules for Transductor based Gate Drives,
Kärst, J. P.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference-PCIM (CD-ROM), S. 673-678,
7.-9. Juni 2005, Nürnberg

Inductive Decoupling of Parallel Connected Commutation Cells for Dynamic Current Balancing,
Hoffmann, K. F.; Kärst, J. P.,
IEEE 35th Annual Power Electronics Specialists Conference- PESC (CD-ROM), S. 3978-3983,
20.-25. June 2004, Aachen

Transductor based High Speed Gate Drive,
Kärst, J. P.; Hoffmann, K. F.,
IEEE 35th Annual Power Electronics Specialists Conference- PESC (CD-ROM), S. 100-104,
20.-25. June 2004, Aachen

Analysis of Dynamic Current Balancing in Parallel Commutation Cells,
Hoffmann, K. F.; Kärst, J. P.,
Power Conversion and Intelligent Motion Conference- PCIM, S. 991-996, 25.-27. Mai 2004, Nürnberg

High Speed Complementary Gate Drives Utilizing a Single Planar Transformer,
Kärst, J. P.; Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference- PCIM, S. 299-303, 25.-27. Mai 2004, Nürnberg

Development of Coupling Elements in Bidirectional UPS,
Hoffmann, K. F.; Schmidt, J.; Güldner, H.,
Proceedings of 10th European Conference on Power Electronics and Applications – EPE (CD-ROM), Beitrags-Nr. 1069, 2.-4. September 2003, Toulouse

Bidirectional UPS with Converter Coupling,
Hoffmann, K. F.,
Power Conversion and Intelligent Motion Conference – PCIM , S. 39-44, 20.-22. May 2003, Nürnberg

Wechselrichter für transformatorlose unterbrechungsfreie Stromversorgungsanlagen,
Patt, M.,
Dissertation, Fortschritt-Berichte VDI, VDI-Verlag, Referent: Schmidt, J., Koreferent: Steimel, A.,
2002, Düsseldorf

Unterbrechungsfreie Stromversorgungssysteme-Untersuchungen zum
Netz-Wechselrichter-Parallelbetrieb,
Hoffmann, K. F.,
Dissertation, Fortschritt-Berichte VDI, VDI-Verlag, Referent: Schmidt, J., Korreferent: Güldner, H.,
2002, Düsseldorf

Einphasiger SEPIC-Gleichrichter mit minimierten Netzrückwirkungen für statische USV-Anwendungen,
Brücher, B.,
Dissertation, Fortschritt-Berichte VDI, VDI-Verlag, Referent: Schmidt, J., Korreferent: Heuck, K.,
2001, Düsseldorf

Comparison Between Hard and soft Switched DC/AC IGBT Inverters for usage in uninterruptible power supplies,
Patt, M.; Renken, F.; Schmidt, J.,
9th International Conference and Exhibition on Power Electronics and Motion Control, Vol. 2. pp.34- 39, 5.-7. September 2000, Kosice, Slovak Republic

Some aspects of reducing ferromagnetic components in Uninterruptible Power Supplies,
Hoffmann, K. F.; Patt, M.,
Telescon 2000 – proceedings on the third international telecommunications energy special conference, VDE-Verlag, S. 240-244, 7.-10. May 2000, Dresden

Einphasige Wechselrichter mit hart und weich schaltenden Transistoren für statische unterbrechungsfreie Stromversorgungen,
Renken, F.,
Dissertation, Fortschritt-Berichte VDI, VDI-Verlag, Referent: Schmidt, J., Korreferent: Steimel, A.,
1999, Düsseldorf

Steps of development and efficiency improvement of UPS,
Schmidt, J; Hoffmann, K. F.,
Korea-German Advanced Power Electronics Symposium, S. 143-150, 1998, Kepri Taejon Korea

SIMPLE FUZZY CONTROL of a PWM INVERTER for a UPS SYSTEM,
Osterholz, H.,
Intelec 95, International Telecommunications Energy Conference, Proceedings,
Oct. 29 – Nov. 1, 1995, The Hague, Netherlands

Einsatzbereiche, Anforderungen und Konzepte netzunabhängiger Stromversorgungen und Normung und Standardisierung bei netzunabhängigen Stromversorgungen,
Schmidt, J.,
Beiträge zur Tagung „Netzunabhängige Stromversorgung“, Technische Akademie Esslingen, Tagungsband, 28.-29. Juni 1995, Esslingen

IGBT – Stromrichtersystem für USV – Anlagen mit Potentialtrennung im Mittelfrequenzbereich,
Flachkamp, F.,
Dissertation FB ET, UniBwH, Referent: Schmidt, J., Koreferent: Depenbrock, M., 1993, Hamburg

Erforderliche Schaltungsmaßnahmen beim Einsatz abschaltbarer Thyristoren (GTO s) mit höheren Frequenzen,
Sievers, R.,
Dissertation FB ET, UniBwH, VDI-Verlag, Reihe 21, Nr. 53, Referent: Schmidt, J.,
Koreferent: Depenbrock, M., Juni 1989, Hamburg

Entwicklung eines digitalen Simulationsprogrammes für Schaltungen der Leistungselektronik,
Schumacher, K.,
Dissertation FB ET, UniBwH, Referent: Schmidt, J., Koreferent: Michel, M., Januar 1988, Hamburg