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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Transformer winding loss caused by skin and proximity effects including harmonics in pulse-width modulated DC¿DC flyback converters for the continuous conduction mode
TL;DR: In this article, a two-winding transformer with periodic non-sinusoidal primary and secondary current waveforms for flyback converters operating in the continuous conduction mode (CCM) is presented.
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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.
Proceedings ArticleDOI
Design optimization of high frequency transformer for dual active bridge DC-DC converter
Khoa Dang Hoang,Jiabin Wang +1 more
TL;DR: In this paper, a design optimization procedure for high frequency transformer (HFT) employed in bidirectional dual active bridge (DAB) isolated DC-DC converter is presented, where leakage inductance, phase-shifted angle, skin and proximity effects have to be taken into account together with the HFT voltage-ampere rating.
Journal ArticleDOI
SiC-Based 5-kV Universal Modular Soft-Switching Solid-State Transformer (M-S4T) for Medium-Voltage DC Microgrids and Distribution Grids
Liran Zheng,Xiangyu Han,Zheng An,Rajendra Prasad Kandula,Karthik Kandasamy,Maryam Saeedifard,Deepak Divan +6 more
TL;DR: In this article, a 5-kV SiC-based universal modular solid-state transformer (SST) was proposed for medium-voltage dc (MVdc) grids, which can interface either an LVac or LVdc grid with an MVdc grid in single-stage power conversion.
Proceedings ArticleDOI
Optimal design of a compact 99.3% efficient single-phase PFC rectifier
TL;DR: In this paper, an optimisation procedure for a single-phase bridgeless PFC rectifier for maximum efficiency is presented, which automatically determines the parameter values of the rectifier.
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.