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Analysis of a Solid-State Transformer Employing Capacitively Isolated Series-Stacked Converter Cells and a Single Medium-Frequency Transformer
(2023)2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL)Solid-state transformers (SST) provide voltage scaling and galvanic isolation between medium-voltage (MV) and low-voltage (LV) dc busses. Most SST topologies arrange several isolated dc-dc converter cells in an input-series, output-parallel (ISOP) configuration, whereby each cell’s medium-frequency transformer (MFT) must withstand the very high lightning impulse (LI) surge test voltage resulting in a significant volume overhead from ...Conference Paper -
New 600V GaN Single-Stage Isolated Bidirectional 400V Input Three-Phase PFC Rectifier
(2023)2023 IEEE Energy Conversion Congress and Exposition (ECCE)This paper introduces a novel single-stage isolated bidirectional partly modular three-phase power-factor-correction (PFC) rectifier topology that requires half the blocking voltage rating of the primary-side transistors compared to conventional monolithic three-phase circuit arrangements. Specifically, interfacing a 400V three-phase grid to a 400V dc output is possible using modern high-performance 600V GaN transistors in standard ...Conference Paper -
Motor Power Pulsation Buffer for Single-to-Three-Phase Current-Source-Converter Drives
(2023)2023 IEEE Energy Conversion Congress and Exposition (ECCE)Single-phase-input variable-speed drives (VSDs) for three-phase motors typically employ bulky dc-link capacitors for buffering the inherent power pulsations at twice the mains frequency. Alternatively, the power pulsation can be accommodated in the drivetrain’s moment of inertia, a concept known as motor power pulsation buffer (MPPB). This paper briefly describes how a state-of-the-art control implementation for single-to-three-phase ...Conference Paper -
Core-as-a-Sensor: Ferrite DC-Resistance-Based Core Temperature Measurement of Magnetics
(2023)2023 IEEE Energy Conversion Congress and Exposition (ECCE)Future power electronic systems should feature continuous in-situ monitoring of components to facilitate, e.g., predictive maintenance and lifetime prognostics. Temperatures of magnetic components (i.e., transformers and inductors) are typically measured with thermocouples attached to the core surface. It is known from literature that the electrical conductivity of ferrite, typically used as core material of high-frequency magnetics, is ...Conference Paper -
Novel S-Link Enabling Ultra-Compact and Ultra-Efficient Three-Phase and Single-Phase Operable On-Board EV Chargers
(2023)2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL)On-Board Chargers (OBCs) comprising an ac-dc front-end and a subsequent isolated dc-dc converter stage represent a crucial component of Electric Vehicles (EVs), and must be able to charge the EV battery from both, a three-phase mains and a single-phase mains. Further, a lightweight and compact realization of the OBC is key in mobile applications. This requirement for high gravimetric and volumetric power density is often hindered by the ...Conference Paper -
Synthesis of Low-Switch-Count Power Converter Topologies
(2023)2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)A systematic method is presented for synthesizing power converter topologies, using only a low number of semiconductor devices. The method is based on a single-switch elementary converter that can be used as a power converter building block. It is shown, that many well known converter topologies can be synthesized using the method. Furthermore, two novel single-phase power factor correction (PFC) rectifier topologies are synthesized, their ...Conference Paper -
Single-/Three-Phase Bidirectional EV On-Board Charger Featuring Full Power/Voltage Range and Cost-Effective Implementation
(2023)2023 IEEE 17th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)On-board chargers (OBC) are required to operate under a wide range of operating conditions in terms of input voltage, phase number, and output battery voltage. Accordingly, achieving a high-performance, efficient and cost-effective implementation poses special challenges. In this paper, a novel OBC architecture is considered which is able to operate both in three-phase and single-phase configuration with full output power range without ...Conference Paper -
Conceptualization of a Cryogenic 250-A Power Supply for High-Temperature-Superconducting (HTS) Magnets of Future Particle Accelerators
(2023)2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)Future particle accelerators for high-energy physics experiments such as the Future Circular Collider (FCC) at CERN employ high-temperature-superconducting (HTS) magnets to guide and focus the particle beams. However, the high-current/large-cross-section copper conductors used to connect the HTS magnet coils to the power supply conventionally located outside of the cryostat create a thermal leakage path, which ultimately results in high ...Conference Paper -
New Triple-Output Quad-Active-Bridge DC/DC Converter Employing a Four-Leg Inverter Input Stage
(2023)2023 26th International Conference on Electrical Machines and Systems (ICEMS)Charging stations for electric vehicles require electrical isolation between the charging ports. Therefore, this paper proposes a multi-port DC/DC converter structure that combines three conventional dual-active bridge converters (DABCs) where the primary side switching stages are integrated into a single four-leg inverter, and three individually isolated output ports (4L3) are provided. This quad-active bridge converter (QABC) structure ...Conference Paper -
Novel Bidirectional Single-Stage Isolated Three-Phase Buck-Boost PFC Rectifier System
(2023)2023 IEEE Applied Power Electronics Conference and Exposition (APEC)Future three-phase ac-dc converter systems ideally allow for bidirectional power flow, provide high-frequency isolation, and feature buck-boost capability. Further, high efficiency and high compactness and the applicability of standard half-bridge and/or three-phase full-bridge (B6) semiconductor arrangements are crucial aspects. This Paper proposes a novel converter concept that employs B6-type circuits on the input and on the output ...Conference Paper