Proceedings ArticleDOI
Eddy current losses in SMPS transformers round wire windings: a semi-analytical closed-form formula
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TLDR
In this paper, a closed-form formula that calculates the 2D high-frequency ohmic losses (skin and proximity effects) in round wire windings has been provided by overwriting the classical definition (shown to be erroneous) of the layer copper factor introduced in 1D analytical theories.Abstract:
We provide a new closed-form formula that instantly calculates the 2D high-frequency ohmic losses (skin and proximity effects) in round wire windings It has been obtained by overwriting the classical definition (shown to be erroneous) of the layer copper factor introduced in 1D analytical theories Compared to similar previous formulas, the average error is divided by a factor of thousand Experimental validation is providedread more
Citations
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Journal ArticleDOI
High-Frequency Copper Losses in Magnetic Components With Layered Windings
TL;DR: In this paper, the impact of the edge effect and the winding pitch on the overall copper losses in magnetic coils is investigated. And the results of this work help us to fully understand the real impact of two-dimensional effects in layered windings of real rather than ideal magnetics.
Journal ArticleDOI
A Semiempirical Model to Determine HF Copper Losses in Magnetic Components With Nonlayered Coils
TL;DR: In this paper, a semi-empirical model for the accurate determination of HF copper losses in windings with the random conductor distribution is presented, based on the statistical treatment of numerical results coming from a large number of simulations carried out with finite-element analysis software, and incorporates only three easily determinable parameters.
Proceedings ArticleDOI
A new model for the determination of copper losses in transformer windings with arbitrary conductor distribution under high frequency sinusoidal excitation
TL;DR: In this article, a new expression for the calculation of high frequency copper losses in transformer and inductor coils with round conductors, more general than the existent models and without any of the traditionally imposed assumptions and limitations, is proposed and established by finite element analysis and measurement results.
Proceedings ArticleDOI
Comparison of analytical methods for calculating the AC resistance and leakage inductance of medium-frequency transformers
TL;DR: In this article, a detailed investigation and comparison of different analytical expressions for the high-frequency resistance of medium-frequency transformers is presented, made by 2D FEM simulations and experimental tests with suitable transformers.
Proceedings ArticleDOI
Investigation of high frequency effects on layered coils
TL;DR: In this paper, a finite element analysis (FEA) software is utilized for the investigation of a series of issues critical for the accurate determination of copper losses in layered coils with round wires or foils.
References
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Journal ArticleDOI
Effects of eddy currents in transformer windings
TL;DR: In this article, the effect of eddy currents on transformer windings is considered and a method is derived for calculating the variation of winding resistance and leakage inductance with frequency for transformers with single-layer, multilayer and sectionalised windings.
Journal ArticleDOI
Improved analytical modeling of conductive losses in magnetic components
TL;DR: In this paper, the authors propose an orthogonality between skin effect and proximity effect to calculate the AC resistance of round conductor windings, which gives more accurate answers than the basic one-dimensional method because the exact analytical equations for round conductors can be used.
Journal ArticleDOI
Computationally efficient winding loss calculation with multiple windings, arbitrary waveforms, and two-dimensional or three-dimensional field geometry
TL;DR: The squared-field-derivative method for calculating eddy-current (proximity effect) losses in round-wire or litz-wire transformer and inductor windings is derived in this paper.
Proceedings ArticleDOI
An improved calculation of proximity-effect loss in high-frequency windings of round conductors
Xi Nan,Charles R. Sullivan +1 more
TL;DR: In this paper, the Ferreira method and Dowell method were compared to evaluate the accuracy of each method for predicting proximity-effect losses in round-wire windings and found that the Dowell algorithm can have substantial errors, exceeding 60%.
Journal ArticleDOI
A novel approach for minimizing high-frequency transformer copper losses
J. P. Vandelac,Phoivos D. Ziogas +1 more
TL;DR: In this article, a graphical and numerical method of calculating and minimizing losses in windings, that generalizes previous findings, has been introduced using electromagnetic theory and MMF diagrams in both space and time.