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4D-Interleaving of Isolated ISOP Multi-Cell Converter Systems for Single Phase AC/DC Conversion
(2016)Proceedings of International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Engery ManagementConference Paper -
Dual-Inverter Topology for Single-Phase Supplied Drive Systems without Electrolytic Capacitor
(2021)2021 24th International Conference on Electrical Machines and Systems (ICEMS)Single-phase supplied variable speed drive (VSD) systems are widely used in industrial applications and typically feature a two-stage design with a power factor corrected (PFC) boost rectifier and a three-phase voltage source inverter (VSI). However, the electrolytic DC-link capacitor, which is needed to cope with the twice grid frequency power pulsation, and the required boost inductor are unfavourable in terms of reliability, volume, ...Conference Paper -
Application of WBG Power Devices in Future 3-Φ Variable Speed Drive Inverter Systems "How to Handle a Double-Edged Sword"
(2020)2020 IEEE International Electron Devices Meeting (IEDM)Latest research results on three-phase wide-bandgap (WBG) inverter systems with full-sinewave output voltage filtering are reported. A new soft-switching modulation scheme for two-level 1200 V SiC inverters is described. Furthermore, a new Figure-of-Merit for determining maximum multi-level (ML) bridge-leg efficiency is defined and low-voltage GaN devices are evaluated considering ML flying capacitor (FC) and multi-cell inverter structures. ...Conference Paper -
High-Bandwidth High-CMRR Current Measurement for a 4.8MHz Multi-Level GaN Inverter AC Power Source
(2021)2021 IEEE Applied Power Electronics Conference and Exposition (APEC)The control of very high switching frequency power electronic converter systems featuring latest generation wide bandgap (WBG) devices requires current measurements with a very high bandwidth (BW) to achieve high closed-loop control dynamics. One example is a ultra-high BW 4.8 MHz parallel-interleaved multi-level GaN inverter AC power source with a target output BW of 100 kHz. This work investigates the combination of state-of-the-art ...Conference Paper -
Comparative Evaluation of Overload Capability and Rated Power Efficiency of 200V Si/GaN 7-Level FC 3-Φ Variable Speed Drive Inverter Systems
(2021)2021 IEEE Applied Power Electronics Conference and Exposition (APEC)Variable speed drive systems in e.g. robotics applications are challenged with discontinuous operation cycles and short-time overload current requirements of 2-3 times nominal load. As the motor itself constitutes a large thermal time constant compared to the semiconductor devices in the inverter, latter create a bottleneck for the increased losses during overload operation. Hence, special focus has to be laid on the inverter overload ...Conference Paper -
Design and Control of an Active Reset Circuit for Pulse Transformers
(2008)2008 IEEE International Power Modulators and High-Voltage ConferenceIn pulse modulators applying pulse transformers reset circuits are used to achieve optimal utilization of the core material, which results in lower costs, downsized pulse transformer/system volume and therefore in an improved pulse behavior due to the smaller parasitics. Because of its simplicity the most common method to reset the core is a dc reset circuit, where a dc current is used to premagnetize the core. However, the dc reset circuit ...Conference Paper -
Novel AC coupled gate driver for ultra fast switching of normally-off SiC JFETs
(2011)IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics SocietyConference Paper -
Solid State Modulator for Plasma Channel Drilling
(2008)2008 IEEE International Power Modulators and High-Voltage ConferenceIn addition to conventional mechanical and explosive drilling and demolition, drilling based on the use of pulsed electric power has been investigated intensively and recently commercial applications begin to emerge. With this method, the demolition of the rock is either performed by sonic impulses due to pulse discharges in water or by discharges directly through the rock, called plasma channel drilling (PCD). Due to the direct impact, ...Conference Paper -
Control and Protection of a Synergetically Controlled Two-Stage Boost-Buck PFC Rectifier System under Irregular Grid Conditions
(2020)2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia)There is an increasing demand for three-phase mains interfaced high power EV chargers that provide a wide output voltage range while featuring low losses and a high power density. In this context, a synergetic control structure for a two-stage three-phase boost PFC rectifier with subsequent DC/DC buck stage was proposed, which allows to only switch one out of the three rectifier bridge legs, leading to switching loss savings of over 66 ...Conference Paper -
A 180MW, 450kV Solid State Modulator Based on Press Pack IGBT Technology
(2010)Proceedings of the IEEE International Power Modulator and High Voltage Conference (IPMHVC 2010)Conference Paper