Parasitics of Orthocyclic Windings in Inductors and Transformers

Shen, Zhan; Wang, Huai

doi:10.1109/tpel.2020.3006882

Cited by 12 publications

(4 citation statements)

References 75 publications

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“…where S Wire and S Winding are the total cross-sectional area occupied by the wire and winding, respectively. The orthocyclic winding in magnetic components is common in both laboratory prototyping and mass production, especially for round wires with curved edges (Shen and Wang, 2021). As shown in Figure 1(a), in the orthocyclic winding, the number of turns in even layers is one less than that of odd layers.…”

Section: Coil Winding Technologymentioning

confidence: 99%

A new winding homogenization method based on thermal resistance concept

Hashemi,

Yazdanpanah Qaraei,

Shabanian-Poodeh

2024

COMPEL

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Purpose The aim of this paper is to provide a simple yet accurate and efficient geometric method for thermal homogenization of impregnated and non-impregnated coil winding technologies based on the concept of thermal resistance. Design/methodology/approach For regular windings, the periodic microscopic cell in the winding space is identified. Also, for irregular windings, the average microscopic cell of the winding is determined. An approximation is used to calculate the thermal resistance of the winding cell. Based on this approximation, the winding insulation is considered as a circular ring around the wire. Mathematical equations are obtained to calculate the equivalent thermal resistance of the cell. The equivalent thermal conductivity of the winding is calculated using equivalent thermal resistance of the cell. Winding thermal homogenization is completed by determining the equivalent thermal properties of the cell. Findings The thermal pattern of different windings is simulated and compared with the results of different homogenization methods. The results show that the proposed method is applicable for a wide range of windings in terms of winding scheme, packing factor and winding insulation. Also, the results show that the proposed method is more accurate than other winding homogenization methods in calculating the equivalent thermal conductivity of the winding. Research limitations/implications In this paper, the change of electrical resistance of the winding with temperature and thermal contact between the sub-components are ignored. Also, liquid insulators, such as oils, and rectangular wires were not investigated. Research in these topics is considered as future work. Originality/value Unlike other homogenization methods, the proposed method can be applied to non-impregnated and irregular windings. Also, compared to other homogenization methods, the proposed method has a simpler formulation that makes it easier to program and implement. All of these indicate the efficiency of the proposed method in the thermal analysis of the winding.

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Section: Coil Winding Technologymentioning

confidence: 99%

A new winding homogenization method based on thermal resistance concept

Hashemi,

Yazdanpanah Qaraei,

Shabanian-Poodeh

2024

COMPEL

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“…In [11][12], a method is proposed to calculate the inter-turn capacitance by simulating the electric field lines between adjacent coils, but this method was only applicable to circular straight wires and could not calculate the inter-turn capacitance of non-adjacent turns. Moreover, magnetic components' windings are equivalent to cylindrical or plate capacitors in many papers [13][14][15][16][17]. However, these studies do not consider the electrical field around the edges of winding layers (called edge effects in this paper).…”

Section: Introductionmentioning

confidence: 99%

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

Lan,

Yang,

Zhang

et al. 2023

IEEE Access

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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.

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“…For the stray capacitance modeling, various structurebased analytical methods are reviewed in [16]. The impact of the various winding architectures and wire types is discussed in [17][18][19][20][21][22][23][24]. The stray capacitance of planar transformers is a severe issue, and the tradeoff between the stray capacitance, ac resistance, and leakage inductance is discussed in [25][26] [27].…”

Section: Introduction He Dab Convertermentioning

confidence: 99%

“…It is later developed by considering the more detailed winding and core structure into the analysis [35]. Further, the leakage inductance of magnetics with Litz wire [38], unparalleled winding [39], nonidea winding [24], and different winding shape and configurations [40][41] [42] are investigated through the detailed magnetic field flux modeling, respectively. In general, those researches focus on the physical-structure-based parasitic modeling of single magnetic components.…”

Section: Introduction He Dab Convertermentioning

confidence: 99%