Loss Characterization and Calculation of Nanocrystalline Cores for High-frequency Magnetics Applications

Shen, Wei; Wang, F.; Boroyevich, Dushan; Tipton, C.W.

doi:10.1109/apex.2007.357500

Cited by 37 publications

(41 citation statements)

References 11 publications

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“…These good properties are preserved even for higher frequencies [1] and for higher temperatures, as was investigated in [2]. The applications of nanocrystalline cores have until now been mainly in pulsed power application systems [3], and some investigations have also been in the field of current transformers [4], [5].…”

Section: Introductionmentioning

confidence: 92%

Magnetic Circuit of a High-Voltage Transformer up to 10 kHz

2015

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Power and energy measurements in smart grids require a measurement system capable of performing signal processing at the higher harmonic frequencies that are present in power grids. For the calibration process of instrument voltage transformers, or high-voltage dividers, it is necessary to have a high-voltage source with an appropriate frequency range. The fundamental element of such a source is the output high-voltage transformer operating at a nominal voltage of 10 kV and in the frequency range from 200 Hz up to 10 kHz. The output current is assumed to be lower than 20 mA. This paper focuses on the design and realization of the magnetic circuit of the transformer described above. Trafoperm, ferrite or nanocrystalline materials can be used for the frequency range considered here. Ferrite materials usually reach saturation at a magnetic flux density of 0.2 T with very low permeability values, while trafoperm material usually suffers from unacceptable power losses in higher frequency areas. This is the main reason why these materials are not suitable for use in a wide range of frequencies, and some combined magnetic cores must be used. The proposed solution is based on magnetic cut C type cores made from nanocrystalline alloy (VITROPERM 500), which behaves better in the frequency range under consideration. The magnetic parameters of this material were measured and compared with trafoperm, and then, the 10 kV high-voltage transformer was designed and manufactured.

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Section: Introductionmentioning

confidence: 92%

Magnetic Circuit of a High-Voltage Transformer up to 10 kHz

2015

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“…Core loss due to non-sinusoidal waveforms can far exceed the loss due to sinusoidal waveforms, even if the frequencies and the peak-to-peak flux densities are identical [29]. In order to determine losses for a wider variety of waveforms, some modified expressions including modified Steinmetz expression (MSE) [30], generalized Steinmetz equation (GSE) [31], improved GSE (IGSE) [32], improved IGSE (I 2 GSE) [33], natural Steinmetz extension (NSE) [34], equivalent elliptical loop (EEL) [35] and waveform coefficient Steinmetz equation (WCSE) [36] were introduced. A complete comparison among these modified empirical methods shows that the IGSE have the best loss determination with a wide variety of waveforms [29].…”

Section: Power Loss Analysismentioning

confidence: 99%

Analysis and Design of Fully Integrated Planar Magnetics for Primary–Parallel Isolated Boost Converter

Ouyang

Sen

Thomsen

et al. 2013

IEEE Trans. Ind. Electron.

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“…It has to be noted that the nanocrystalline material tested in this paper is not a cut-core. As presented in [16] the preparation for producing cut-cores highly modifies the magnetic properties of the core losses, leading to different Steinmetz coefficients. Particularly, cut-cores always present more losses than entire, not cut, ribbon bobbins.…”

Section: Losses Analysis Versus Variable Phase Displaced Harmonics Inmentioning

confidence: 99%

Laminated magnetic materials losses analysis under non-sinusoidal flux waveforms in power electronics systems

Aguglia

Neuhaus²

2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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Losses analyses of laminated magnetic materials subject to non-sinusoidal magnetic flux are presented. Comparative analyses on typical Fe-Si oriented and non-oriented grains and nanocrystalline materials are carried out considering the influence of harmonic phase shift and associated B-H minor loops. Experimental measurements are performed to illustrate the B-H characteristics behaviours. A special experimental effort is given on nanocrystalline material, where Steinmetz coefficients are experimentally identified to analyse the performances of the improved Generalized Steinmetz Equation (iGSE) when phase displaced minor loops occur. It is proven that the iGSE is efficient in predicting nanocrystalline losses versus variable phase displaced harmonics. AbstractLosses analyses of laminated magnetic materials subject to non-sinusoidal magnetic flux are presented. Comparative analyses on typical Fe-Si oriented and non-oriented grains and nanocrystalline materials are carried out considering the influence of harmonic phase shift and associated B-H minor loops. Experimental measurements are performed to illustrate the B-H characteristics behaviours. A special experimental effort is given on nanocrystalline material, where Steinmetz coefficients are experimentally identified to analyse the performances of the improved Generalized Steinmetz Equation (iGSE) when phase displaced minor loops occur. It is proven that the iGSE is efficient in predicting nanocrystalline losses versus variable phase displaced harmonics.

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Loss Characterization and Calculation of Nanocrystalline Cores for High-frequency Magnetics Applications

Cited by 37 publications

References 11 publications

Magnetic Circuit of a High-Voltage Transformer up to 10 kHz

Magnetic Circuit of a High-Voltage Transformer up to 10 kHz

Analysis and Design of Fully Integrated Planar Magnetics for Primary–Parallel Isolated Boost Converter

Laminated magnetic materials losses analysis under non-sinusoidal flux waveforms in power electronics systems

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