Improved Analytical Calculation of High Frequency Winding Losses in Planar Inductors

Wang, Xiaohui; Wang, Li; Mao, Ling; Zhang, Yaojia

doi:10.1109/ecce.2018.8558397

Cited by 10 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 (a.3). So (19) only considers the insulation coating between two bare conductors with the thickness of 2δ wire . It overestimates the layer capacitance when there is air between two wires and d air > 0.…”

Section: Compensation Equations For Orthocyclic Windingmentioning

confidence: 99%

“…Orc., respectively. The analytical result with (17) and with (19) but without equivalent permittivity and diameter compensation equations (22,23) are also presented as Anal. Norm.…”

Section: Compensation Equations For Orthocyclic Windingmentioning

confidence: 99%

“…So the calculated equivalent permittivity and the effective capacitance distance decrease, which finally leads to the decrease of the calculated capacitance. The original equation for the orthocyclic winding (19) without equivalent permittivity and diameter compensation equations (22,23) neglects the inter-layer insulation distance a iso , which overestimates the capacitance in all cases. It results in a maximum error of 111.5%.…”

Section: Fem and Experimental Verification: A Case Studymentioning

confidence: 99%

“…It results in a maximum error of 111.5%. The proposed orthocyclic equation uses (19) and the compensation equations. It considers a iso and obtains the lowest errors in all cases, with the maximum error 23.9%.…”

Section: Fem and Experimental Verification: A Case Studymentioning

confidence: 99%

“…Firstly, when the porosity factor η, i.e., the winding height divided by the core window height, decreases, there is magnetic field distortion. Analytical models in [16,17] use η as the adjust coefficient in to compensate this effect, while models in [18,19] solve the two-dimensional field directly. Secondly, the winding curvature also leads to the two dimensional effect, and the analytical solution in the cylindrical coordinates is used to modify Dowell's equation with correction factors [20].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Parasitics of Orthocyclic Windings in Inductors and Transformers

Shen

Wang

2021

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

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.

show abstract

Section: Compensation Equations For Orthocyclic Windingmentioning

confidence: 99%

“…Orc., respectively. The analytical result with (17) and with (19) but without equivalent permittivity and diameter compensation equations (22,23) are also presented as Anal. Norm.…”

Section: Compensation Equations For Orthocyclic Windingmentioning

confidence: 99%

Section: Fem and Experimental Verification: A Case Studymentioning

confidence: 99%

Section: Fem and Experimental Verification: A Case Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Parasitics of Orthocyclic Windings in Inductors and Transformers

Shen

Wang

2021

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

Reduction of Alternating‐Current Resistance and Heat Generation of Spiral Inductors with Magnetic Sealing Technique

Shimura

Kanaya

Kobayashi

et al. 2023

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

As direct current-direct current (DC-DC) converters increase their power density, their inductors require a planar structure with good heat dissipation. Planar inductors use rectangular wires or substrate patterns for their windings. Winding structures can be stacked, in which the structures are on top of each other; spiral, in which the windings are configured in the same plane; or composite structures of both. Here, the authors clarify the alternating-current (AC) resistance of inductors with different winding structures and propose a magnetic sealing technique (MST) that reduces the AC resistance of low-profile spiral inductors. Magnetic field simulation revealed the effect of MST on the AC resistance and inductance. Furthermore, spiral inductors with MST were fabricated, and the AC resistance reduction effect of MST was confirmed with impedance analyzer. The heat-generation reduction effect in an MST inductor was demonstrated in a 1-MHz 100 V/320 V 800-W boost DC-DC converter prototype with GaN devices.

show abstract

Calculation Model of Parasitic Capacitance for High-Frequency Inductors and Transformers

Lan,

Yang,

Zhang

et al. 2023

IEEE Access

View full text Add to dashboard Cite

With high power density and high-frequency power electronics technologies, parasitic capacitances of inductors and transformers have been widely discussed, in which parasitic capacitance may lead to electromagnetic interference (EMI) and efficiency performance degradation. Therefore, it is significant to analyze and model the parasitic capacitance of the inductors and transformers. This paper proposes a new parasitic capacitance calculated model of multilayer windings inductors and transformers. Based on the electromagnetic field theory, it can fully consider the edge effect of multilayer inductor windings, including the edge effect between adjacent and non-adjacent layers. Finally, the accuracy of the model is validated by simulation and experiment. Compared with the traditional parasitic capacitance calculated method, the proposed model can calculate the parasitic capacitance more accurately, and the maximum error between calculations and simulations is less than 8%.INDEX TERMS Parasitic capacitance, edge effect, modeling, inductor.

show abstract

Improved Analytical Calculation of High Frequency Winding Losses in Planar Inductors

Cited by 10 publications

References 10 publications

Parasitics of Orthocyclic Windings in Inductors and Transformers

Parasitics of Orthocyclic Windings in Inductors and Transformers

Reduction of Alternating‐Current Resistance and Heat Generation of Spiral Inductors with Magnetic Sealing Technique

Calculation Model of Parasitic Capacitance for High-Frequency Inductors and Transformers

Contact Info

Product

Resources

About