Journal ArticleDOI
Effects of eddy currents in transformer windings
P.L. Dowell
- Vol. 113, Iss: 8, pp 1387-1394
TLDR
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.Abstract:
The effects of eddy currents in transformer windings are 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. The method consists in dividing the winding into portions, calculating the d.c. resistances and d.c. leakage inductances of each of these portions, and then multiplying the d.c. values by appropriate factors to obtain the corresponding a.c. values. These a.c. values are then referred to, say, the primary winding and summed to give the total winding resistance and leakage inductance of the transformer. Formulas are derived and quoted for calculating the d.c. resistances and leakage inductances of the winding portions. Theoretical expressions are derived for the variation with frequency etc. of the factors by which the d.c. values must be multiplied to obtain the corresponding a.c. values. These expressions are presented in the form of graphs, permitting the factors to be read as required.read more
Citations
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Journal ArticleDOI
Analytical Modeling and Implementation of a Coaxially Wound Transformer With Integrated Filter Inductance for Isolated Soft-Switching DC–DC Converters
TL;DR: The operating principles, design procedure, and loss modeling of a CWT with an integrated filter inductance are introduced and its functionality and suitability for high-frequency applications were proven by theoretical analysis and experiments.
Proceedings ArticleDOI
Accurate and computationally efficient modeling of flyback transformer parasitics and their influence on converter losses
D. Leuenberger,Jurgen Biela +1 more
TL;DR: In this paper, the influence of the transformer parasitic capacitances and leakage inductance in the flyback-converter design process is analyzed, and a loss-analysis is performed for all three operation modes of a flyback converter and methods for modeling the parasitic elements are discussed.
Proceedings ArticleDOI
Impact of planar transformer winding capacitance on Si-based and GaN-based LLC resonant converter
Weimin Zhang,Yu Long,Yutian Cui,Fred Wang,Leon M. Tolbert,Benjamin J. Blalock,Stephan Henning,Justin D. Moses,Robert N. Dean +8 more
TL;DR: In this article, the impact of winding capacitance on the design and performance of LLC resonant converter is studied, and four different winding structures are analyzed based on a selected core, which show the decrease of AC resistance and the increase of wound capacitance.
Dissertation
Design and Optimization of HF Transformers for High Power DC-DC Applications
TL;DR: In this article, the authors proposed a design and optimization methodology of a high power high frequency transformer accounting for the tuned leakage inductance of the transformer, particularly in DC offshore application, where a converter module should withstand the MVDC or HVDC link voltage.
Journal ArticleDOI
Complete Modeling of Toroidal Inductors for High Power RF Applications
TL;DR: In this paper, a high frequency toroidal model is developed and used to calculate several critical inductor parameters such as inductance, resonance frequency, quality factor, power loss, flux density with good accuracy for high power RF applications.
References
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Journal ArticleDOI
Effective resistance to alternating currents of multilayer windings
Edward Bennett,Sidney C. Larson +1 more
TL;DR: In this article, a multilayer winding carrying an alternating current, such as the windings illustrated in figures 1, 2, and 3, each layer of copper lies in the alternating magnetic field set up by the current in all the other layers.
Journal ArticleDOI
Eddy Currents in Large Slot-Wound Conductors
TL;DR: In this article, the authors discuss the more important causes of eddy currents in heavy conductors carrying alternating currents and surrounded on three sides by iron, and propose a method to identify the most important causes.
Journal ArticleDOI
Effective Resistance to Alternating Currents of Multilayer Windings
Journal ArticleDOI
Eddy-Current Losses in Cylindrical Conductors, with Special Applications to the Alternating Current Resistances of Short Coils
TL;DR: In this article, it is shown that a considerable proportion of the effective resistance of inductive coils when used at radio frequencies is caused by the eddy-currents set up in the wires of the coils by the alternating magnetic field in which they are situated, and that in extreme cases the alternating current resistance may amount to more than one hundred times the direct current resistance.
Journal ArticleDOI
Heat Losses in the Conductors of Alternating-Current Machines
TL;DR: In this article, the authors show how hyperbolic functions of complex angles may be applied to the solution of the problem of heat losses in rectangular conductors that are embedded in open slots.