An Improved Empirical Formulation for Magnetic Core Losses Estimation Under Nonsinusoidal Induction

Barg, Sobhi; Ammous, Kaiçar; Mejbri, Hanen; Ammous, Anis

doi:10.1109/tpel.2016.2555359

Cited by 104 publications

(88 citation statements)

References 14 publications

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“…For applications with switching frequency above 10kHz, especially in the case of strongly asymmetrical PWM or with zero-voltage phase (e.g. dual active bridge converter), the frequency dependent part of core loss becomes observable, including the impact of the duty-cycle analysed by [29] as well as the relaxation effect discussed in the work of [30], which arise from residual mechanisms other than static hysteresis. The frequency dependent effects require additional resistive components to be included into the magnetic circuit, which is however not in scope of this work and will be investigated in the future.…”

Section: Application In Power Electronic Circuitmentioning

confidence: 99%

Modeling Frequency Independent Hysteresis Effects of Ferrite Core Materials Using Permeance–Capacitance Analogy for System-Level Circuit Simulations

Luo

Dujić

Allmeling³

2018

IEEE Trans. Power Electron.

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Ferrite materials are widely used for magnetic cores in power electronic converters. The hysteresis effect of the material leads to power loss and harmonic distortion. In order to predict the behaviour of the magnetic component in the system environment during the design phase, accurate system-level timedomain simulation is desired. This work proposes an approach to model the frequency-independent magnetic hysteresis effect of ferrite core materials in magnetic circuits based on the permeance-capacitance analogy. The model is able to accurately reproduce the per-cycle energy loss and equivalent permeability of the hysteresis loops under excitation in a wide range of amplitudes.

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Section: Application In Power Electronic Circuitmentioning

confidence: 99%

Modeling Frequency Independent Hysteresis Effects of Ferrite Core Materials Using Permeance–Capacitance Analogy for System-Level Circuit Simulations

Luo

Dujić

Allmeling³

2018

IEEE Trans. Power Electron.

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“…Based on the basic Steinmetz equation, an improved generalized Steinmetz equation (iGSE) [29,30] was proposed to extend the available operating frequency and flux density range. The iGSE is expressed as:…”

Section: Core Loss Model Of Nanocrystalline Powder Inductormentioning

confidence: 99%

Nanocrystalline Powder Cores for High-Power High-Frequency Applications

Jiang

Ghosh

et al. 2020

IEEE Trans. Power Electron.

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Soft magnetic composites (SMCs) based magnetic cores are attractive in high frequency inductor design. The desired overall core permeability of SMC core can be achieved by adjusting the powder size, addition of insulation material and phosphoric acid, and pressure during the preparation process to reduce the air gap loss and ease the inductor design. The nanocrystalline alloy (Fe-Cu-Nb-Si-B) is an emerging SMC with high saturation flux density and low hysteresis loss, showing potential suitability for SMC based magnetic cores. To date, nanocrystalline alloys are mostly used in form of laminated ribbon for magnetic cores and nanocrystalline powder SMCs have been seldom used in practice. Also, neither experimental validation nor comparison with other commercialized and commonly used SMC cores has been reported. In this paper, the structure and manufacturing process of nanocrystalline powder cores are introduced. The calculation of core loss is defined for the nanocrystalline powder core. The characteristics and performance of the nanocrystalline powder toroidal core are compared with those of existing commercial SMC cores such as Fe-Si powder (X flux), Fe-Ni powder (High flux), Fe-Si-Al powder (Kool Mµ), Fe-Ni-Mo powder (MPP). Experimental results are conducted at frequencies from 100 kHz to 600 kHz to verify the loss calculation and feasibility of this new nanocrystalline powder core.

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“…The selection of the switching frequency and the duty cycle is defined arbitrarily. However, it was shown in the literature that the duty cycle presents a great effect on the core loss and the winding loss [22][23][24][25][26][27][28][29][30][31][32]. The frequency has also an important role in the transformer loss and volume.…”

Section: Challenges In the Design Of Hf Transformermentioning

confidence: 99%

“…Several empirical models have been developed to calculate magnetic core loss of high-frequency inductive components used in switching power supplies. These models, which are the modified Steinmetz equation, the generalized Steinmetz equation (GSE), the improved GSE and the improved 2 GSE, are derived from the Steinmetz equation [23][24][25][26][27]. They present some limitations which are explained in [22].…”

Section: Core Loss Predictionmentioning

confidence: 99%

Multi-objective Pareto and GAs nonlinear optimization approach for flyback transformer

Barg

Bertilsson

2019

Electr Eng

Self Cite

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Design and optimization of high-frequency inductive components is a complex task because of the huge number of variables to manipulate, the strong interdependence and the interaction between variables, the nonlinear variation of some design variables as well as the problem nonlinearity. This paper proposes a multi-objective design methodology of a 200-W flyback transformer in continuous conduction mode using genetic algorithms and Pareto optimality concept. The objective is to minimize loss, volume and cost of the transformer. Design variables such as the duty cycle, the winding configuration and the core shape, which have great effects on the former objectives but were neglected in previous works, are considered in this paper. The optimization is performed in discrete research space at different switching frequencies. In total, 24 magnetic materials, 6 core shapes and 2 winding configurations are considered in the database. Accurate volume and cost models are also developed to deal with the optimization in the discrete research space. The bi-objective (loss-volume) and tri-objective (loss-volume-cost) optimization results are presented, and the variations of the design variables are analyzed for the case of 60 kHz. An example of a design (30 kHz) is experimentally verified. The registered efficiency is 88% at full load.

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An Improved Empirical Formulation for Magnetic Core Losses Estimation Under Nonsinusoidal Induction

Cited by 104 publications

References 14 publications

Modeling Frequency Independent Hysteresis Effects of Ferrite Core Materials Using Permeance–Capacitance Analogy for System-Level Circuit Simulations

Modeling Frequency Independent Hysteresis Effects of Ferrite Core Materials Using Permeance–Capacitance Analogy for System-Level Circuit Simulations

Nanocrystalline Powder Cores for High-Power High-Frequency Applications

Multi-objective Pareto and GAs nonlinear optimization approach for flyback transformer

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