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On-board energy supply systems


Due to new developments in the areas of functionality, safety and infotainment in the motor vehicle the amount of electric components has increased in the last years. This and the combination of different voltage levels complicate an optimal dimensioning. To controll the high complexity and to achieve the different requirements already in an early state of the  development process, the importance of a virtual and simulation based power supply dimensioning grows.

In this research topic different methods and processes are developed which help to optimize the power supply network under consideration of aspects such as quality, costs, available space and weight.


Modelling and simulation of the electrical and thermal behaviour

For the power supply simulation modelling methods for all relevant aspects were worked on. Amongst others procedures for the modelling of the follwing components have been developed:

  • Battery
  • Alternator
  • Electrical Components
  • Contacts
  • Fuses and Wires

With the developed modells static and dynamic investigations were performed.

Development of optimization methods

An optimal dimensioning of a power supply network is only possible when considering the voltage stability and at the same time the ampacity of the wire. Modern modelling languages which consider differnet physical domains are used.

Further Information

Modeling of the Automotive Power Supply Network with VHDL-AMS

Dynamische Simulation der Spannungsstabilität und des thermischen Verhaltens von Fahrzeugbordnetzen


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Prof. Dr.-Ing. Stephan Frei
Head of chair
Tel.: 0231 755-5980