Power Electronics

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The activities of the "Power Electronics" research group include research into innovative power electronic systems, converters and components. The complete spectrum of power electronics is investigated: from component interaction at system level and converter control to circuit layout and the design of magnetic components as well as the packaging and interconnection technology of semiconductors. A central prerequisite for converter and system analysis is the reliable modeling of components and topologies. Numerous commercial programs and self-created tools are available for this purpose. Another important part of the work is the practical realization and metrological verification of device and converter concepts. Various test benches and specially equipped laboratories are available for the design and characterization of converters and components. In addition to the development of power electronic circuits, the focus is particularly on research into auxiliary circuits such as driver circuits, sensor technology and flexible control hardware architectures. At the component level, the focus is on innovative concepts with regard to integration, packaging, contacting and cooling.

The research group "Reliable Power Electronic Systems" develops technologies to increase the reliability and safety of power electronic systems. With our experience in multi-domain modeling, system identification and electronics design, we look at research questions in the area of reliability from new perspectives and thus try to promote the development of disruptive technologies. The goal of our research is to develop future power electronics that act as intelligent multi-domain actuators and sensors. To this end, we develop modeling and characterization tools to simulate electrical, thermal, and mechanical state variables over arbitrary load cycles. Based on this, we predict degradation, aging and reliability of all components of a power electronic system. One focus of our group is the real-time monitoring of power electronic systems. By combining compact real-time models, integrated sensors and system identification methods, we develop new monitoring techniques to reliably extract critical system variables, such as semiconductor losses, 3D temperature gradients, strains, and electrical and thermal impedances. This protects power electronic systems from overload. It can also diagnose degradation modes and determine the remaining lifetime of various power electronic components. Another important research aspect is lifetime-oriented control algorithms that reduce induced thermomechanical strain by selectively reducing thermal cycling, thus increasing the lifetime and reliability of power electronic systems. This approach makes it possible to reduce the weight, volume and cost of future power electronics systems without compromising service life and reliability.

Research Focus:

  • Modeling and analysis
  • Inverter design and synthesis
  • Measurement and evaluation
  • Overall system simulation and design
  • Electromagnetic compatibility
  • Integration and Packaging
  • Characterization and measurement of power electronic systems
  • Multi-domain modeling
  • Cyclization of converters for accelerated aging
  • Modeling and simulation of aging processes
  • Real-time monitoring
  • Aging diagnosis and prognosis
  • Reliability-oriented design of converters
  • Design and connection technology and sensor integration
  • Lifetime-optimized control