Modeling and Increasing the High-Frequency Impedance of Single-Layer Mn-Zn Ferrite Toroidal Inductors With Electromagnetic Analysis

Li, Yiming; Wang, Shuo

doi:10.1109/tpel.2020.3039809

Cited by 23 publications

(25 citation statements)

References 11 publications

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“…Nevertheless it is generally not accurate enough for loose winding made with round conductors. In the literature this problem is solved with image theory [18], equivalent segment or arc parasitic capacitances [19]- [22], a combination of the two previous methods [23], conformal transform [24], or 2D FEM [25], [26]. The latter approach will be used in this paper because it takes into account insulation layers, coating, inter-turn and turn-core spaces.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Minimization of the Parasitic Capacitances of Single-Layer Toroidal Inductors

Salomez

Videt

Idir

2022

IEEE Trans. Power Electron.

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High-frequency power converters need electromagnetic interferences filters using common and differential mode chokes with low parasitic capacitance to comply with the electromagnetic compatibility standards. This paper proposes a modelling method of this capacitance and ways to minimize it. The studied components are ring core inductors with magnetic materials considered as perfect conductors or with high permittivity, such as nano-crystalline material and most Mn-Zn ferrite materials. In comparison to other work in the literature, the proposed approach takes into account the curvature of the turn in addition to the coating of the core and the insulation layer of the wire. The hypotheses, used in this work to simplify the real geometry, are compatible with two dimensional approaches to compute the parasitic inter-turns and turn-core capacitances. These capacitances are evaluated thanks to the 2D finite element method. The obtained model allows accurate evaluation of the effect of turn-core space on the parasitic capacitance, and enables to reduce its value with a limited impact on the volume of the magnetic component.

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Section: Introductionmentioning

confidence: 99%

Modeling and Minimization of the Parasitic Capacitances of Single-Layer Toroidal Inductors

Salomez

Videt

Idir

2022

IEEE Trans. Power Electron.

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“…The elementary inductors are not considered as open-circuit elements in this method. Since the core is floating, the voltage potential on the core is assumed to be V total /2 according to [1], [3], [24].…”

Section: B the Energy Conservation Methodsmentioning

confidence: 99%

“…The parasitic parameters in passive components are of growing importance [1]- [7] due to the exponentially increasing use of wide-band-gap devices in power electronic converters to operate at higher frequencies with faster switching transients [8]- [10]. Faster switching speed can result in larger currents due to the parasitic capacitance in inductors [11], which will cause extra losses in transistors [12] and EMI/EMC issues [1], [13], and therefore limit the potential performance of high-frequency converters. In order to mitigate the effects of parasitic capacitance in magnetic components, it is important to properly model and analyze parasitic capacitance in inductors.…”

Section: Introductionmentioning

confidence: 99%

Rethinking Basic Assumptions for Modeling Parasitic Capacitance in Inductors

Zhao

Luan

Shen

et al. 2022

IEEE Trans. Power Electron.

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This paper rethinks the basic assumptions often used in analytically modeling parasitic capacitance in inductors. These assumptions are classified in two commonly-used physicsbased analysis methods: the lumped capacitor network method and the energy conservation method. The lumped-capacitor network method is not the proper solution for calculating the equivalent parasitic capacitance in inductors at the first resonant frequency, but rather represents the equivalent parasitic capacitance above the last resonant frequency. The energy-conservation based method is shown to be more accurate and a reasonable solution to model the equivalent parasitic capacitance at the first resonant frequency. Multiple case studies of inductors are used for verifying the theory.

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“…elementary inductors are not considered as open-circuit elements in this method. Since the core is floating, the voltage potential on the core is assumed to be V total /2 according to [1], [3], [15].…”

Section: Ctc(n-1) Ctcnmentioning

confidence: 99%

Rethinking Basic Assumptions for Modeling Parasitic Capacitance in Inductors

Zhao¹,

Luan²,

Shen³

et al. 2021

Preprint

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<b>This paper rethinks the basic assumptions often used in analytically modeling parasitic capacitance in inductors. These assumptions are classified in two commonly-used physics-based analysis methods: the lumped capacitor network method and the energy conservation method. The lumped-capacitor network method is not the proper solution for calculating the equivalent parasitic capacitance in inductors at the first resonant frequency, but rather represents the equivalent parasitic capacitance above the last resonant frequency. The energy-conservation based method is shown to be more accurate and a reasonable solution to model the equivalent parasitic capacitance at the first resonant frequency. Multiple case studies of inductors are used for verifying the theory. </b>

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Modeling and Increasing the High-Frequency Impedance of Single-Layer Mn-Zn Ferrite Toroidal Inductors With Electromagnetic Analysis

Cited by 23 publications

References 11 publications

Modeling and Minimization of the Parasitic Capacitances of Single-Layer Toroidal Inductors

Modeling and Minimization of the Parasitic Capacitances of Single-Layer Toroidal Inductors

Rethinking Basic Assumptions for Modeling Parasitic Capacitance in Inductors

Rethinking Basic Assumptions for Modeling Parasitic Capacitance in Inductors

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