The "IMAB Racer" is a battery electric sports car for research and teaching purposes at the Institute for Electrical Maschines, Traction and Drives of TU Braunschweig. All components, especially the different parts of the drive train, are designed and built by students and academic stuff. One very innovative component is the presented boost converter, which enables the bidirectional energy flow between the battery and the inverter's dc-link. Using this converter, the dc-link voltage can be controlled precisely and the driving dynamics become independent from the battery's state of charge. The permanently higher dc-link voltage allows the inverter and the electrical machine to operate with lower currents. Consequently, the cross section of the used cables may be reduced. Commonly used silicon based power semiconductors reach their limits when high voltage, high power and very high switching frequencies are demanded at the same time. This is where silicon carbide offers new possibilities and expands former limitations. The new power semiconductor devices are combined with innovative materials for the passive components. The smoothing choke benefits from the use of special low-loss iron powder cores, which allow higher flux density than ferrite materials. The automotive power boost converter is an application well-suited to demonstrate the benefits of silicon carbide power semiconductors. The component profits from the high switching frequency, resulting in a device with very high power density and low power weight. The main challenges that have to be overcome are: (1) Find an optimal design regarding switching frequency and switching losses, inductance and current ripple, efficiency, space and weight. (2) Find the best suiting passive components. (3) Design a driver circuit capable to deal with very high voltage gradients. (4) Design a cooling system to cope with high power density. Compared to a former IGBT-based design, weight and volume of the boost converter could be decreased by about 80 %. This is crucial for the decision to integrate the component into the demonstration car.


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    Titel :

    SiC boost converter with high power density for a battery electric sports car


    Beteiligte:
    Henke, M. (Autor:in) / Tareilus, G. (Autor:in) / Langmaack, N. (Autor:in)


    Erscheinungsdatum :

    2014


    Format / Umfang :

    13 Seiten, Bilder, Tabellen, 6 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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