Winding resistance and power loss for inductors with litz and solid-round wires

Wojda, Rafal P.

doi:10.1109/epepemc.2016.7752107

Cited by 26 publications

(21 citation statements)

References 20 publications

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“…This transition will always occur around ds/δ = 2 because of skin effect. These three zones and their associated boundary frequencies have been identified in [22] and [23]. Actually, skin effect is already present before this limit but is not high enough to have a significant impact on the resistance factor.…”

Section: B Frequency-dependent Resistance 1) General Commentsmentioning

confidence: 93%

“…For a winding of width w, height h containing N turns placed inside a one-dimensional field such as the one described in II.A.1, a proximity factor can be expressed as shown in (23). Development of this equation may be found in Appendix A, and η corresponds to the proportion of conductive material inside the winding being considered as composed of evenly distributed round conductors with insulating material between them.…”

Section: ) Asymptotic Modelmentioning

confidence: 99%

“…The resistance factor was calculated with each of the models and FEM modeling for various frequencies (corresponding to ratio diameter to skin depth ds/δ) in the range of 100 Hz -1 MHz. For asymptotic and Albach, 2D refers to (22) and (27) being used with a two-dimensional magnetic field calculation method, whereas 1D refers to (23) and (28).…”

Section: B Frequency-dependent Resistancementioning

confidence: 99%

See 2 more Smart Citations

Semi-Analytical Methods for Calculation of Leakage Inductance and Frequency-Dependent Resistance of Windings in Transformers

Fouineau¹,

Raulet²,

Lefebvre³

et al. 2018

IEEE Trans. Magn.

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Leakage inductance and frequency-dependent resistance of windings are key parameters for the design of magnetic devices. This report focuses on analytical or semi-analytical calculation techniques to be integrated into a medium frequency transformer optimization process. To this extend, a review of currently most used method to calculate inductance and resistance of windings transformer is established. Based on this review, new calculation methods are developed. Magnetic field cartography is evaluated on the basis of two-dimensional structures thanks to a combination of Ampère's law and image method. From this magnetic field map, leakage inductance can be calculated. The obtained accuracy with this method is equivalent to three-dimensional finite element modeling. For frequency-dependent resistance evaluation, new methods based on two-dimensional or one-dimensional approach are compared to finite element modeling and reviewed models. An analysis of behavior of each model is done, showing that newly developed models are more suitable in the case of medium frequency transformer design in terms of accuracy, robustness and calculation time. This work could be useful to magnetic devices designers because newly developed models could easily be adapted to various geometries, such as toroidal structures or even inductors.

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Section: B Frequency-dependent Resistance 1) General Commentsmentioning

confidence: 93%

Section: ) Asymptotic Modelmentioning

confidence: 99%

Section: B Frequency-dependent Resistancementioning

confidence: 99%

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Semi-Analytical Methods for Calculation of Leakage Inductance and Frequency-Dependent Resistance of Windings in Transformers

Fouineau¹,

Raulet²,

Lefebvre³

et al. 2018

IEEE Trans. Magn.

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“…It is considered that the venting clip has lower resistive components than that of the conventional clip due to the presence of the slots. As a result of the decreased eddy-current effects of the slots, the venting clip could enable the higher transmission of current flows through the outer edge of the clip than the conventional clip in the AC condition [29].…”

Section: Charactristics Of Venting Clipmentioning

confidence: 99%

Theoretical and experimental analysis of a venting clip to reduce stray inductance in high‐power conversion applications

et al. 2021

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“…The dc winding loss occurs from the resistivity of the conductor and the loss can be reduced easily by increasing the cross-sectional area of the conductor. The ac winding power loss occurs from skin and proximity effect of ac current [24,[29][30][31][32]. The inductor core loss, which is dependent on core volume, occurs due to the change in magnetic flux field within the core.…”

Section: 7mentioning

confidence: 99%

Design process of high‐frequency inductor with multiple air‐gaps in the dimensional limitation

Liao

Chen

2021

The Journal of Engineering

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To find the optimal magnetic components designing process within the dimensional limitation, different inductor arrangements are developed. Different combinations of air‐gaps and material arrangements are used within the limited bobbin space to improve the saturation current capacity within the already set dimension. In this study, the mechanism requirement set at 1U height is the limitation. There are two center‐pole material cores, and air‐gap distribution arrangement in the magnetic components. The saturation current value, magnetic flux density, flux fringing, and power loss of inductors are investigated with simulation, equation calculation and actual circuit measurement. The magnetic distribution affects the inductor performance because of the different relative permeability values, skin effect, proximity effect, and fringing effect. This research uses equations to find the magnetic flux density and the fringing magnetic flux, and uses Comsol Multiphysics® software to simulate the magnetic field. A 500 W boost power factor corrections (PFC) converter topology is used as an example experiment to compare and verify the inductors selected with proposed design methodology. Finally, the most appropriate core is chosen to implement the two‐stage AC/DC power supply products to improve the power supply performance.

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Winding resistance and power loss for inductors with litz and solid-round wires

Cited by 26 publications

References 20 publications

Semi-Analytical Methods for Calculation of Leakage Inductance and Frequency-Dependent Resistance of Windings in Transformers

Semi-Analytical Methods for Calculation of Leakage Inductance and Frequency-Dependent Resistance of Windings in Transformers

Theoretical and experimental analysis of a venting clip to reduce stray inductance in high‐power conversion applications

Design process of high‐frequency inductor with multiple air‐gaps in the dimensional limitation

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