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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Optimizing core and winding design in high frequency transformers
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Design of Intercell Transformers for High-Power Multicell Interleaved Flyback Converter
Francois Forest,Eric Laboure,Bertrand Gelis,Vanessa Smet,Thierry Meynard,Jean-Jacques Huselstein +5 more
TL;DR: In this paper, the results of an analytic method elaborated to design isolated intercell transformers are presented for multicell interleaved flyback converters recently proposed and well-suited to lowvoltage, high power applications.
Journal ArticleDOI
The Influence of Complex Permeability on the Broadband Frequency Response of a Power Transformer
Steve Mitchell,James S. Welsh +1 more
TL;DR: In this article, the effect of the complex permeability of a power transformer core on the frequency response analysis (FRA) test spectrum was investigated and it was shown that the effect is significant at 1 MHz and greater than unity at frequencies exceeding 15 MHz.
Proceedings ArticleDOI
A 98.7% efficient composite converter architecture with application-tailored efficiency characteristic
TL;DR: In this paper, a dc-dc boost composite converter architecture is introduced that can lead to optimized efficiency over a range of operating points dictated by the application requirements, which is composed of three converter modules: buck converter, boost converter, and a dual active bridge converter that operates as a dc transformer.
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.