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Comparative Evaluation of ARCP and Three-Level TCM Soft-Switching Bridge-Legs for High-Frequency SiC Converter Systems
(2022)2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)Soft-switching bridge-legs facilitate high-efficiency three-phase PV inverters or PFC rectifiers. By extending a half-bridge with a resonant auxiliary circuit, including two additional transistors, zero-voltage switching (ZVS) of the main transistors can be realized (Active Resonant Commutated Pole, ARCP). Alternatively, a similar T-type bridge-leg structure achieves ZVS by operating the output filter inductor with a sufficiently high ...Conference Paper -
Performance Evaluation of Future T-Type PFC Rectifier and Inverter Systems with Monolithic Bidirectional 600 V GaN Switches
(2021)2021 IEEE Energy Conversion Congress and Exposition (ECCE)Three-phase PFC rectifier and inverter systems can be realized using identical main converter stages (MCSs) that comprise three three-level T-Type (TT) bridge-legs and a DC-bus referenced LC-filter stage. TT bridge-legs advantageously realize three output voltage levels by extending a half-bridge with the possibility to connect the switch node to the capacitive DC-link midpoint. To do so, a switching device with bipolar voltage blocking ...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 -
Advanced Synergetic Charge Control of Three-Phase PFC Buck-Boost Current DC-Link EV Chargers
(2022)2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics (COMPEL)An advanced synergetic charge-based mains cur-rent control (ASC) for three-phase power factor correction (PFC) buck-boost current DC-link AC/DC converters, which integrate a front-end buck-type current DC-link PFC rectifier and a DC/DC boost converter output stage, is proposed. The charge control is embedded in the synergetic (coordinated) control of the two converter stages, retaining all advantageous features such as only a minimum ...Conference Paper -
Concept of a Novel Bearingless Three-Pole Motor for Two-Sided Driven Applications
(2021)2021 24th International Conference on Electrical Machines and Systems (ICEMS)This paper presents a novel bearingless three-pole motor for two-sided driven applications, i. e., two motors levitating and rotating a common rotor without any mechanical contact. When operating in chemically demanding environments its advantages are highly promising: the bearingless technology allows friction- and wear-free motion, unlimited lifetime and a hermetically sealed encapsulation of the rotor, while the novel motor convinces ...Conference Paper -
Contactless Positioning of Objects on Acoustically Reflective Surfaces by Means of Ultrasonic Forces
(2022)2022 IEEE International Ultrasonics Symposium (IUS)Ultrasonic forces have been used to keep small objects in a suspended state for a long time. In recent years, methods have been developed to manipulate the levitating objects and to lift objects located on acoustically transparent or reflective surfaces. This work demonstrates an ultrasonic levitation system, which is capable of transporting objects from and to acoustically reflective surfaces, while controlling the orientation of the ...Conference Paper -
3-Φ Bidirectional Buck-Boost Sinusoidal Input Current Three-Level SiC Y-Rectifier
(2021)2021 IEEE Applied Power Electronics Conference and Exposition (APEC)Aiming for ever more compact and efficient Electric Vehicle (EV) battery chargers, in this paper a three-phase phase-modular buck-boost Three-Level Flying Capacitor Y-Rectifier (3L-FC-YR) is introduced. The unique circuit structure of the 3L-FC-YR requires time-varying flying capacitor voltages, making the safe and performant operation of such a converter system challenging. Accordingly, a special clamping modulation strategy is proposed ...Conference Paper -
Modular Multilevel Converter Circulating Current Control with Single Active Filter Module per Phase
(2021)2021 22nd IEEE International Conference on Industrial Technology (ICIT)Phase-legs of DC/AC modular multilevel converters (MMC, M2LC) transfer power from the DC input to the corresponding phase output terminal by means of a current that circulates through the DC input and the phase-leg. In addition to the load-dependent DC component required for the power transfer, this circulating current contains significant harmonics if no countermeasures are implemented. Prominently, a large second harmonic appears, ...Conference Paper -
Design and Experimental Analysis of a Selfbearing Double-Stator Linear-Rotary Actuator
(2021)2021 IEEE International Electric Machines and Drives Conference (IEMDC)Linear-rotary actuators (LiRAs) are today used in industry applications where a controlled linear and rotary motion is necessary such as pick-and-place robots, servo actuation of gearboxes or tooling machines. However, in special industry applications that require high purity and/or high precision positioning, the usage of conventional LiRAs with mechanical bearings is limited. Therefore, in this paper a LiRA with integrated magnetic ...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