Comparison of analytical methods for calculating the AC resistance and leakage inductance of medium-frequency transformers

Kaymak, Murat; Shen, Zhan; Doncker, Rik W. De

doi:10.1109/compel.2016.7556740

Cited by 25 publications

(13 citation statements)

References 37 publications

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“…Over the last decades, many researchers proposed different methods to model the ac resistance in litz wire inductors and transformers [3]- [7]. One of the most commonly used methods is finite element method (FEM) [8,9]. High accuracy can be obtained with extra effort in constructing the FEM model and using 3D simulation.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Litz-Wire Planar Spiral Coil for Inductive Power Transfer Application

Zhao¹,

Peng²,

Zhan³

et al. 2023

Preprint

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<p>Litz wire planar spiral coils are widely used in inductive power transfer systems due to low power loss in high-frequency operation and low profile. However, the complicated structure of the litz wire coil imposes difficulties in estimating the frequency-dependent resistance and quality factor accurately. In this work, we present an 2D analytical model for calculating the frequency-dependent resistance and quality factor of multi-coil inductive power transfer systems based on superposition of different loss effects. Its accuracy is validated with multiple coils and litz wires over wide frequency range. Meanwhile, a fast and accurate multi-objective optimization method is developed to improve the product quality factor and coupling factor. From the optimization results, there are five factors affecting the quality factor and coupling factor. A set of design guidelines is proposed to cope with these design factors. The final prototypes show 33\% increase in quality factor and 23\% improvement in coupling factor compared with the state-of-the-art designs. Meanwhile, a 30W, 500kHz inductive power transfer system is designed with 91\% peak efficiency.</p>

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Section: Introductionmentioning

confidence: 99%

Design and Optimization of Litz-Wire Planar Spiral Coil for Inductive Power Transfer Application

Zhao¹,

Peng²,

Zhan³

et al. 2023

Preprint

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“…Ferreira introduced orthogonality into the winding loss calculation and provided the formulas for round conductors based on the Bessel function. The two 1-D methods were compared with 2-D FEM and measurements in several papers [3], [4], [5], [6]. It is shown that Dowell's model has good accuracy for compacted windings.…”

Section: Introductionmentioning

confidence: 99%

2-D Winding Losses Calculation for Round Conductor Coil

Luo

Niasar

Vaessen

2023

IEEE Trans. Power Electron.

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“…The classic formula for the winding ac resistance is proposed by Dowell [10] and is widely applied for ac resistance optimization [11][12][13]. It is derived in the Cartesian coordinate system, and assumes that the magnetic flux is parallel to the winding in height direction.…”

Section: Introductionmentioning

confidence: 99%

Parasitics of Orthocyclic Windings in Inductors and Transformers

Shen

Wang

2021

IEEE Trans. Power Electron.

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The orthocyclic winding in magnetic components is common in both laboratory prototyping and massproduction, especially for round wires with curved edges. However, its impact on winding parasitics, i.e., the winding capacitance, ac resistance, and leakage inductance, has not been systematically investigated. Omission or inaccurate calculation of those parameters lead to current ringing, additional losses, and even abnormal operations. In this paper, three modified formulas for parasitics of orthocyclic windings are proposed, and the impacts of the orthocyclic windings are comprehensively studied. The magnetic field distortion and air-gap effect are analyzed and compensated. The formulas are verified by finite element method (FEM) simulation and experimental results. Finally, a comparison of the normal and orthocyclic winding is performed, and conclusions are listed to control the parasitics of orthocyclic windings.

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Comparison of analytical methods for calculating the AC resistance and leakage inductance of medium-frequency transformers

Cited by 25 publications

References 37 publications

Design and Optimization of Litz-Wire Planar Spiral Coil for Inductive Power Transfer Application

Design and Optimization of Litz-Wire Planar Spiral Coil for Inductive Power Transfer Application

2-D Winding Losses Calculation for Round Conductor Coil

Parasitics of Orthocyclic Windings in Inductors and Transformers

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