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Ultra-High Bandwidth GaN-Based Class-D Power Amplifier for Testing of Three-Phase Mains Interfaces of Renewable Energy Systems
(2020)2019 8th International Conference on Renewable Energy Research and Applications (ICRERA)Conference Paper -
Optimal Synergetic Control of a Three-Phase Two-Stage Ultra-Wide Output Voltage Range EV Battery Charger Employing a Novel Hybrid Quantum Series Resonant DC/DC Converter
(2020)2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)A wide output voltage range (200 − 1000V DC ) isolated two-stage three-phase EV charger is proposed. The system employs a boost-type two-level PFC rectifier front-end and the subsequent novel Hybrid Quantum Series Resonant DC/DC Converter (H-QSRC) output stage, which is left either unregulated with constant voltage transfer ratio or is used to emulate a buck or boost behavior. For reducing the H-QSRC voltage transfer ratio discretization, ...Conference Paper -
Wide-Input-Voltage-Range 3 kW DC-DC Converter with Hybrid LLC Boundary / Discontinuous Mode Control
(2020)2020 IEEE Applied Power Electronics Conference and Exposition (APEC)Growing applications such as electric vehicles, data centers, and industrial robotics require power-dense and efficient converters systems to provide high output currents at low output voltages of generally 12 V. Today's converters achieve high efficiencies at a specific input voltage, but drastically lose efficiency once the input voltage deviates from its nominal value. A large voltage swing, however, is a common situation in the ...Conference Paper -
Transient Calorimetric Measurement of Ferrite Core Losses
(2020)2020 IEEE Applied Power Electronics Conference and Exposition (APEC)An accurate and fast transient calorimetric ferrite core-loss measurement method is proposed in this paper. In contrast to electrical measurements, the accuracy of the calorimetric approach is independent of the magnetic excitation and operating frequency. However, an accurate value of the thermal capacitance of the Core Under Test (CUT) is required, which can be achieved, e.g., by measuring the specific heat capacity of the measured core ...Conference Paper -
Three-Phase Bidirectional Buck-Boost Current DC-Link EV Battery Charger Featuring a Wide Output Voltage Range of 200 to 1000V
(2020)2020 IEEE Energy Conversion Congress and Exposition (ECCE)High power EV chargers connected to an AC power distribution bus are employing a three-phase AC/DC Power Factor Correction (PFC) front-end and a series-connected isolated DC/DC converter to efficiently regulate the traction battery voltage and supply the required charging current. In this paper, the component stresses and the design optimization of a novel two-stage three-phase bidirectional buck-boost current DC-link PFC rectifier system, ...Conference Paper -
Analysis and Evaluation of Active/Hybrid/Passive dv/dt-Filter Concepts for Next Generation SiC-Based Variable Speed Drive Inverter Systems
(2020)2020 IEEE Energy Conversion Congress and Exposition (ECCE)State-of-the-art variable speed drive inverter systems are typically employing 1200 V Si IGBTs with antiparallel freewheeling diodes, resulting in a large overall semiconductor chip area, relatively high switching losses and/or low switching frequencies, and causing a substantial on-state voltage drop in both current directions, which inherently limits the peak and part-load efficiency. SiC MOSFETs are seen as natural future replacement ...Conference Paper -
Optimized Cascaded Controller Design for a 10 kW / 100 kHz Large Signal Bandwidth AC Power Source
(2020)2020 IEEE Energy Conversion Congress and Exposition (ECCE)The control system of a phase-modular three-phase 10 kW / 230 V rms Ultra-High bandwidth series/parallel inter-leaved multi-level AC Power Source (UHPS) for P-HIL applications with 4.8 MHz effective switching frequency is optimized with respect to high bandwidth and low output impedance or output admittance (depending on whether output voltage or output current is controlled), by adding selected and effective enhancements to existing ...Conference Paper -
Comparative Evaluation of 800V DC-Link Three-Phase Two/Three-Level SiC Inverter Concepts for Next-Generation Variable Speed Drives
(2020)2020 23rd International Conference on Electrical Machines and Systems (ICEMS)The adoption of wide band-gap (WBG) semiconductors is gaining momentum, particularly in industries where high efficiency and/or extreme power density are major concerns, e.g. electric transportation and aerospace. In order to fully leverage the advantages of WBG devices, identifying the converter topologies best exploiting their superior performance is of utmost importance. Hence, this paper analyzes and compares 2-level and 3-level ...Conference Paper -
Ultra-high Power Density Server Supplies Employing GaN Power Semiconductors and PCB-Integrated Magnetics
(2020)ETG-Fachbericht ~ CIPS 2020: 11th International Conference on Integrated Power Electronics Systems, ProceedingsThe trend towards higher computation power per server rack has lead to an increased interest in high density server power supplies with high efficiency and low cost. This paper analyzes how the specific features of planar magnetics as transformers and inductors can be best utilized in combination with GaN power semiconductors to reach unprecedented system performance both for power supplies with 12V and with 48V output voltage. Based on ...Conference Paper -
“Looking Through Walls” – Actuator Position Measurement Through a Conductive Wall
(2020)2020 23rd International Conference on Electrical Machines and Systems (ICEMS)This paper investigates the design of an Eddy Current Sensor (ECS) for position measurement of a moving conductive target located behind a fixed conductive shielding surface. Such a sensor can e.g. be used in completely sealed actuators with magnetically levitated rotor or mover for high purity applications. A detailed analysis of the sensor is conducted, starting from the conventional ECS and its equivalent circuit model, which is then ...Conference Paper