Open access
Date
2023Type
- Journal Article
ETH Bibliography
yes
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Abstract
The 2D magnetic field effect arises when the winding height is lower than the window height due to isolation requirements and mechanical constraints. In this situation, most analytical models for calculating HF-losses in Litz wire fail to predict the winding losses accurately since they are normally based on a 1D magnetic field assumption. Although numerical or semi-numerical methods can accurately calculate the winding losses, they are too time-consuming to be integrated into the converter optimization routines. This paper provides a new loss model, which is validated to have a much lower error ( <10% ) than 1D field loss models (up to -45%) by numerical calculations and experiments. The model is presented for two winding transformers with layered windings and non-gapped cores with high permeability in the frequency range, where the strand diameter to skin depth ratio is equal to 1.2. Moreover, the model can also be extended for interleaved windings by separating the windings to multiple blocks. Furthermore, the computation time is less than 300μs using the algorithm provided in this paper. This new model achieves a good balance between accuracy and computational time and has great potential to improve the transformer as well as the converter design. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000628878Publication status
publishedExternal links
Journal / series
IEEE Open Journal of Power ElectronicsVolume
Pages / Article No.
Publisher
IEEESubject
2D magnetic field; high frequency losses; Litz wire; transformerOrganisational unit
03889 - Biela, Jürgen / Biela, Jürgen
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ETH Bibliography
yes
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