The PWM generated by wide bandgap devices can feature a shorter rise time than in the case of standard silicon switches. The resulting harmonic content can excite the resonance frequencies of Medium-Frequency Transformers (MFTs), causing internal overvoltages during continuous operation. If ignored, this phenomenon can cause unexpectedly high electric fields in the insulation, possible partial discharges and failure of the MFT. The occurrence of these overvoltages is determined by the high-frequency response of the MFT and it is significantly influenced by the winding topology. In this paper, the choice of conductor type and possible resulting topologies are analyzed. A multi-layer litz winding and a concentric disk foil winding are compared. The trade-off among the conductors used in the two topologies is followed by the analysis of the voltage distribution in the winding by the multi-conductor fully-coupled transmission line method. The continuous disk foil winding MFT does not present internal overvoltages and is therefore a preferable option in this respect. However, in light of the trade-off between litz and foil wire, the global optimal solution will be case-dependent relying on the design requirements, which concur in determining the best design choice.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Medium-Frequency Transformers for Fast Rise Time PWM Voltages: Modelling and Design Considerations


    Beteiligte:


    Erscheinungsdatum :

    05.05.2021


    Format / Umfang :

    595429 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Frequency transformers

    Heyland, A. | Engineering Index Backfile | 1908


    Practical design considerations - modelling and analysis

    MacDiarmid, I. P. | British Library Conference Proceedings | 1990


    Lightweight, high-frequency transformers

    Schwarze, G. E. | NTRS | 1983