Journal ArticleDOI
Computationally efficient winding loss calculation with multiple windings, arbitrary waveforms, and two-dimensional or three-dimensional field geometry
TLDR
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.Abstract:
The squared-field-derivative method for calculating eddy-current (proximity-effect) losses in round-wire or litz-wire transformer and inductor windings is derived. The method is capable of analyzing losses due to two-dimensional and three-dimensional field effects in multiple windings with arbitrary waveforms in each winding. It uses a simple set of numerical magnetostatic field calculations, which require orders of magnitude less computation time than numerical eddy-current solutions, to derive a frequency-independent matrix describing the transformer or inductor. This is combined with a second, independently calculated matrix, based on derivatives of winding currents, to compute total AC loss. Experiments confirm the accuracy of the method.read more
Citations
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Proceedings ArticleDOI
A Two-Dimensional Equivalent Complex Permeability Model for Round-Wire Windings
Xi Nan,Charles R. Sullivan +1 more
TL;DR: In this article, the authors derived an equivalent complex permeability model of a round-wire winding that agrees with finite element analysis results, which can be used to calculate high-frequency winding loss and inductances in transformers and inductors with two-dimensional geometry.
Proceedings ArticleDOI
Additive manufacturing of shaped profile windings for minimal AC loss in gapped inductors
Nick Simpson,Phil Mellor +1 more
TL;DR: In this paper, the design and manufacture of minimal AC loss shaped profile windings using metal additive manufacturing is explored, and a prototype inductor is manufactured and experimentally tested to demonstrate the advantages of shaped windings for AC loss reduction.
Proceedings ArticleDOI
Analysis on a single-layer winding array structure for contactless battery charging systems with free-positioning and localized charging features
TL;DR: In this article, a single-layer winding array with cylindrical ferrite cores for planar contactless battery charging systems is presented, which enables multiple devices to be placed and charged simultaneously on the wireless charging pad in a freepositioning manner.
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
High performance 3D printed electronics using electroless plated copper
TL;DR: In this paper, the authors present design and performance validation of 3D printed electronic components, 3D toroidal air-core inductors, fabricated by multi-material based Fused Deposition Modelling (FDM) 3D printing technology and electroless copper plating.
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
Optimal choice for number of strands in a litz-wire transformer winding
TL;DR: In this paper, the number and diameter of strands to minimize loss in a litz-wire transformer winding is determined, and a power law to model insulation thickness is combined with standard analysis of proximity effect losses to find the optimal stranding.
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
Optimizing the AC resistance of multilayer transformer windings with arbitrary current waveforms
TL;DR: In this article, the authors present a new formula for the optimum foil or layer thickness, without the need for Fourier coefficients and calculations at harmonic frequencies, which is simple, straightforward and applies to any periodic wave shape.