Multipermeability Inductors for Increasing the Inductance and Improving the Efficiency of High-Frequency DC/DC Converters

Wang, Laili; Hu, Zhiyuan; Liu, Yanfei; Pei, Yunqing; Yang, Xu

doi:10.1109/tpel.2012.2228504

Cited by 37 publications

(5 citation statements)

References 28 publications

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“…However, the flux density distribution of the distributed air-gap LTCC inductor is not uniform in the magnetic cores, which can cause the magnetic core near the conductor to saturate easily while the core away from the conductor is not fully utilized. To address this problem, Wang et al [122]- [124] proposes a multi-permeability distributed airgap magnetic structure. The internal permeability is lower than the external permeability, so a more uniform magnetic flux density distribution can be obtained.…”

Section: Ltcc Integration Technologymentioning

confidence: 99%

Review of State-of-the-Art Integration Technologies in Power Electronic Systems

Wang¹

2017

CPSS TPEA

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Section: Ltcc Integration Technologymentioning

confidence: 99%

Review of State-of-the-Art Integration Technologies in Power Electronic Systems

Wang¹

2017

CPSS TPEA

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“…From a modeling perspective, the permeability is assumed to be linear until saturation, after which is assumed to be µ0. This model is improved into a piecewise linear approximation of the BH curve in [7]. Note that as the core is discretized into thinner layers of different magnetic properties, the permeability profile tends to a continuous description.…”

Section: Introductionmentioning

confidence: 99%

Multiobjective Optimization Paradigm for Toroidal Inductors With Spatially Tuned Permeability

Nascimento

Moon

Byerly

et al. 2021

IEEE Trans. Power Electron.

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Spatially tuning core permeability of an electromagnetic device enables superior performance. A permeability profile can be heuristically selected to improve the flux distribution in a device with a given geometry, but in order to fully leverage the capacity of spatial dependent permeability engineering, the geometry and the permeability should be optimized simultaneously. The work herein presented sets forth a multi-physics design optimization paradigm that includes the permeability profile tuning in the context of both inductor and converter design. This approach enables the determination of Pareto optimal fronts consisting of a set of optimal solutions against competing objectives (e.g. mass and loss) under imposed constraints. To this end, computationally efficient analytical solutions of the heat transfer and electromagnetic formulations are derived for toroidal inductors, which are validated with Finite Element Analysis based simulations. The software implemented in Matlab 2018b is available online as an attachment to this paper.

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“…For instance, the relative permeability of ferrite cores (Mn−Zn) is ∼5000−10,000, and the relative permeability of powder cores is ∼20−200. For this reason, it turns out to be that part of magnetic material cannot be fully utilised [6][7][8][9][10][11][12]. In other words, the magnetic material closer to the conductor becoming saturated, while the magnetic material further away from the conductor is still not fully utilised.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, there is a possibility of pushing the magnetic flux density level towards saturation. In order to overcome these problems, several techniques have been proposed [7][8][9][10][11]. In these two studies [7,8], the concept of constant-flux inductor (CFI) was proposed to improve the uniformity of the magnetic flux density distribution.…”

Section: Introductionmentioning

confidence: 99%

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Improved core loss calculation method considering the non‐uniform distribution of magnetic flux density in powder cores

Ishikura¹,

Imaoka²,

Noah³

et al. 2019

IET Power Electronics

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Utilising powder cores in many power electronics applications have gained much attention due to the attractive magnetic properties of powder core materials. However, the magnetic flux density distribution is non-uniform along the core because the flux is dependent on the core geometry and due to the low relative permeability of the powder core material. The non-uniformity of the magnetic flux density distribution may cause huge calculation errors of core losses. Understanding the effect of the magnetic flux non-uniformity in the powder cores allows the circuit designer to accurately estimate the core losses in powder cores. This work addresses the negative effect of the inherent non-uniform magnetic flux density distribution on the core loss. Furthermore, an equivalent circuit to consider the non-uniform of the magnetic flux density distribution is proposed. The proposed circuit enables the core loss to be estimated more precisely. A reduction of 12% in the core loss measurement error has been reported while utilising the proposed circuit compared to traditional equivalent circuits. Along with the theoretical discussion, finite element method simulation and experimental results are also presented to evaluate the proposed core loss calculation method.

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Multipermeability Inductors for Increasing the Inductance and Improving the Efficiency of High-Frequency DC/DC Converters

Cited by 37 publications

References 28 publications

Review of State-of-the-Art Integration Technologies in Power Electronic Systems

Review of State-of-the-Art Integration Technologies in Power Electronic Systems

Multiobjective Optimization Paradigm for Toroidal Inductors With Spatially Tuned Permeability

Improved core loss calculation method considering the non‐uniform distribution of magnetic flux density in powder cores

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