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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 -
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 -
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 -
Synergetic Control of a 3-Φ Buck-Boost Current DC-Link EV Charger Considering Wide Output Range and Irregular Mains Conditions
(2020)2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia)A wide output voltage range EV charger employing a three-phase (3-Φ) buck-type current source rectifier (CSR)-stage and a series-connected boost-type DC/DC-stage is introduced. The system employs a novel control structure, enabling robust operation even under heavily unbalanced 3-Φ mains conditions. It is verified how the proposed concept achieves PFC operation while regulating the output voltage in a wide range, which requires both buck ...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 -
Analysis of Low Frequency Grid Current Harmonics Caused by Load Power Pulsation in a 3-Phase PFC Rectifier
(2020)2019 2nd International Conference on Smart Grid and Renewable Energy (SGRE)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 -
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 -
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