Power Electronic Systems Laboratory (PES)

𝐏𝐨𝐰𝐞𝐫 𝐄𝐥𝐞𝐜𝐭𝐫𝐨𝐧𝐢𝐜 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 𝐋𝐚𝐛𝐨𝐫𝐚𝐭𝐨𝐫𝐲 @ 𝐈𝐒𝐏𝐒𝐃 𝐢𝐧 𝐁𝐫𝐞𝐦𝐞𝐧, 𝐆𝐞𝐫𝐦𝐚𝐧𝐲 Presented Short Course:   Towards Circular Economy Compatible Power Electronics https://lnkd.in/dSzGaJkz #PES #ETHZurich

𝐍𝐨𝐯𝐞𝐥 𝐜𝐥𝐚𝐦𝐩𝐢𝐧𝐠 𝐦𝐨𝐝𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐟𝐨𝐫 𝐭𝐡𝐫𝐞𝐞-𝐩𝐡𝐚𝐬𝐞 𝐛𝐮𝐜𝐤-𝐛𝐨𝐨𝐬𝐭 𝐚𝐜 𝐜𝐡𝐨𝐩𝐩𝐞𝐫𝐬 Three-phase ac choppers feature output voltage amplitude controllability and enable more compact system realizations compared to autotransformers. For the practical realization advantageously standard power transistor with unipolar voltage blocking capability such as MOSFETs can be employed as a naturally resulting offset voltage between the grid and the input-stage starpoint ensures purely positive power transistor voltages. This offset voltage is, however, not strictly defined and may drift to higher voltage values, resulting in high power transistor voltage stresses and finally a potential overvoltage breakdown. Traditionally, the offset voltage drift is prevented by introducing discharge resistors across the input-stage capacitors which, however, results in substantial ohmic losses. This paper analyzes the offset voltage formation in ac choppers and proposes a novel clamping modulation scheme which ensures a strictly defined and minimum time-varying offset voltage without need for discharge resistors. Theoretical analyses and circuit simulations are finally experimentally verified with a 400V (rms, line-to-line) 50 Hz grid connected three-phase buck-boost ac chopper with 3kW rated power. 𝐀𝐮𝐭𝐡𝐨𝐫𝐬: David Menzi, Aobo Yang, Saransh Chhawchharia, Johann KOLAR 𝐏𝐮𝐛𝐥𝐢𝐬𝐡𝐞𝐝 𝐢𝐧: IET Electronics Letters, Vol. 60, No. 13, July 2024 𝐑𝐞𝐚𝐝 𝐦𝐨𝐫𝐞: https://lnkd.in/dgZzWB52 𝐕𝐢𝐬𝐢𝐭 𝐨𝐮𝐫 𝐖𝐞𝐛𝐬𝐢𝐭𝐞: https://lnkd.in/eu-zxBXH #PES, #ETHzurich, #ThreePhase, #ACAC, #AC-Chopper, #ClampingModulation

𝐋𝐞𝐜𝐭𝐮𝐫𝐞𝐬 𝐨𝐧 𝐏𝐨𝐰𝐞𝐫 𝐄𝐥𝐞𝐜𝐭𝐫𝐨𝐧𝐢𝐜 𝐚𝐧𝐝 𝐌𝐞𝐜𝐡𝐚𝐭𝐫𝐨𝐧𝐢𝐜 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 Abstract: https://lnkd.in/dNh8PFga #PES #powerelectronics #ieee #pels

𝐋𝐞𝐜𝐭𝐮𝐫𝐞𝐬 𝐨𝐧 𝐏𝐨𝐰𝐞𝐫 𝐄𝐥𝐞𝐜𝐭𝐫𝐨𝐧𝐢𝐜 𝐚𝐧𝐝 𝐌𝐞𝐜𝐡𝐚𝐭𝐫𝐨𝐧𝐢𝐜 𝐒𝐲𝐬𝐭𝐞𝐦𝐬  Abstract: https://lnkd.in/dNh8PFga #PES #powerelectronics #ieee #pels

𝐏𝐨𝐰𝐞𝐫 𝐄𝐥𝐞𝐜𝐭𝐫𝐨𝐧𝐢𝐜 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 𝐋𝐚𝐛𝐨𝐫𝐚𝐭𝐨𝐫𝐲 @ 𝐏𝐂𝐈𝐌 𝐢𝐧 𝐍𝐮𝐫𝐞𝐦𝐛𝐞𝐫𝐠, 𝐆𝐞𝐫𝐦𝐚𝐧𝐲 Presented Papers: Comparative Evaluation of Three-Phase-Unfolder-Based MVAC-LVDC Solid-State Transformers https://lnkd.in/d3NuWTCD Highly-Compact Bearingless Axial-Flux Motor for a Pediatric Implantable Fontan Blood Pump https://lnkd.in/dznWsM5t Novel Bidirectional Single-Stage Isolated 600-V GaN M-BDS-Based Single-/Three-Phase-Operable EV On-Board Charger https://lnkd.in/dnPTkBsV #PES #ETHZurich #PCIM

𝐘𝐨𝐮𝐧𝐠 𝐑𝐞𝐬𝐞𝐚𝐫𝐜𝐡𝐞𝐫 𝐀𝐰𝐚𝐫𝐝 𝐚𝐭 𝐭𝐡𝐞 𝐏𝐂𝐈𝐌 2024   We are pleased to announce that 𝐀𝐧𝐝𝐫𝐞𝐚𝐬 𝐇𝐨𝐫𝐚𝐭 received the 𝐘𝐨𝐮𝐧𝐠 𝐑𝐞𝐬𝐞𝐚𝐫𝐜𝐡𝐞𝐫 𝐀𝐰𝐚𝐫𝐝 for his paper “Highly-Compact Bearingless Axial-Flux Motor for a Pediatric Implantable Fontan Blood Pump” at PCIM 2024 in Nuremberg, Germany, June 10-12, 2024   𝐀𝐮𝐭𝐡𝐨𝐫𝐬: Andreas Horat, Rosario Vincenzo Giuffrida, Spasoje Miric, Marcus Granegger, M. Hübler, Jonas Huber, Johann KOLAR   𝐑𝐞𝐚𝐝 𝐦𝐨𝐫𝐞: https://lnkd.in/dznWsM5t   𝐕𝐢𝐬𝐢𝐭 𝐨𝐮𝐫 𝐖𝐞𝐛𝐬𝐢𝐭𝐞: https://lnkd.in/e-kGUpXG     #PES #ETHzurich #PCIM

Transformation of the Energy Efficiency Movement (EEM) into an independent association, May 2024

𝐏𝐨𝐰𝐞𝐫 𝐄𝐥𝐞𝐜𝐭𝐫𝐨𝐧𝐢𝐜 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 𝐋𝐚𝐛𝐨𝐫𝐚𝐭𝐨𝐫𝐲 @ 𝐄𝐂𝐂𝐄 𝐀𝐬𝐢𝐚 𝐢𝐧 𝐂𝐡𝐞𝐧𝐠𝐝𝐮, 𝐂𝐡𝐢𝐧𝐚 Presented Papers: Analysis and Comparative Evaluation of a Modularized Bridge Rectifier MVAC-LVDC Solid-State Transformer https://lnkd.in/e-kGUpXG Novel Single-Stage Isolated Natural Ohmic Mains Behaviour Fixed Voltage Transfer Ratio Three-Phase Rectifier Using Monolithic Bidirectional 600V GaN Transistors https://lnkd.in/dXj8GyCR New Phase Current Balancing Control for a Cryogenic Ultra-Low-Loss Bidirectional Multi-Phase Full-Bridge DC-DC Step-Down Converter https://lnkd.in/e-kGUpXG #PES #ETHZurich

𝐊𝐞𝐲𝐧𝐨𝐭𝐞 𝐏𝐫𝐞𝐬𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧 @ 𝐄𝐂𝐂𝐄 𝐀𝐬𝐢𝐚 𝐢𝐧 𝐂𝐡𝐞𝐧𝐠𝐝𝐮, 𝐂𝐡𝐢𝐧𝐚 Prof. Dr. Johann W. Kolar e-VTOL Aircraft – The Future of Urban Air Mobility https://lnkd.in/e-kGUpXG #PES #ETHzurich

𝐂𝐨𝐦𝐩𝐚𝐫𝐚𝐭𝐢𝐯𝐞 𝐄𝐯𝐚𝐥𝐮𝐚𝐭𝐢𝐨𝐧 𝐨𝐟 𝐓𝐡𝐫𝐞𝐞-𝐏𝐡𝐚𝐬𝐞 𝐓𝐡𝐫𝐞𝐞-𝐋𝐞𝐯𝐞𝐥 𝐅𝐥𝐲𝐢𝐧𝐠 𝐂𝐚𝐩𝐚𝐜𝐢𝐭𝐨𝐫 𝐚𝐧𝐝 𝐒𝐭𝐚𝐜𝐤𝐞𝐝 𝐏𝐨𝐥𝐲𝐩𝐡𝐚𝐬𝐞 𝐁𝐫𝐢𝐝𝐠𝐞 𝐆𝐚𝐍 𝐈𝐧𝐯𝐞𝐫𝐭𝐞𝐫 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 𝐟𝐨𝐫 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐞𝐝 𝐌𝐨𝐭𝐨𝐫 𝐃𝐫𝐢𝐯𝐞𝐬 Targeting Integrated Motor Drives with high short-term overload capability two 7.5 kW inverter systems realized with identical 650V GaN power transistors despite the 800V DC-Link voltage are comprehensively compared in this paper: a three-phase Three-Level Flying Capacitor Converter (3L-FCC) and a Stacked Polyphase Bridge Inverter (SPBI) formed by two Series-Stacked Two-Level three-phase Converters (2L-SSC). Advantageously, the 2L-SSC requires no Flying Capacitors and offers the possibility of common-mode (CM) voltage canceling, which, e.g., mitigates Electric Discharge Machining (EDM) damages in the motor bearings. Potential non-idealities in the cancellation can be attenuated to safe voltage levels for the motor by means of a small CM choke. In the case of the 3L-FCC, comparably low CM voltages at the motor can only be achieved with a considerably larger CM choke design. However, if DC-referenced sine-wave output filters are implemented for maximum motor-friendliness, the outcome of the comparison changes in favor of the 3L-FCC thanks to its single three-phase winding set and its high effective switching frequency. 𝐀𝐮𝐭𝐡𝐨𝐫𝐬: Gwendolin Rohner, Jonas Huber, Spasoje Miric, Johann KOLAR 𝐏𝐮𝐛𝐥𝐢𝐬𝐡𝐞𝐝 𝐢𝐧: Electronics 2024, 13, 1259, March 28, 2024, MDPI 𝐑𝐞𝐚𝐝 𝐦𝐨𝐫𝐞: https://lnkd.in/dcA_vEM6 𝐕𝐢𝐬𝐢𝐭 𝐨𝐮𝐫 𝐖𝐞𝐛𝐬𝐢𝐭𝐞: https://lnkd.in/eu-zxBXH #PES, #ETHzurich, #MotorIntegration, #FlyingCapacitorInverter, #StackedPolyphaseBridgeInverter, #GaN, #CM-Choke, #EDM