Article

Measurement of Asymmetric Minor Loops in Soft Ferrites Up to Medium Frequencies

Dept. de Electron. y Autom., Univ. Pontificia Comillas de Madrid, Madrid
IEEE Transactions on Instrumentation and Measurement (Impact Factor: 1.71). 03/2009; 58(2):423 - 428. DOI: 10.1109/TIM.2008.928403
Source: IEEE Xplore

ABSTRACT An accurate measurement of the hysteresis cycle of magnetic cores is a crucial step in its characterization due to the importance that its nonlinear and past-dependent effects can have on the correct operation in most electric and electronic circuits. The measurements of asymmetric minor loops, in conditions where Foucault currents can be neglected, can be useful to train models. Performing such measurements only at very low frequencies is not a solution, given the need to identify dynamic parameters of the aforementioned models. In a previous paper, the authors proposed a method for measuring major loops of hysteresis cycles up to medium frequencies, given the limitation of the classic method when increasing frequency. The method, which has been improved in this paper, is tested by measuring nonsymmetric loops of the hysteresis cycle at medium frequencies. Simulated and experimental results are provided.

1 Follower
 · 
60 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: The advancement of magnetic sensors in biomedical sector has led toward an immense range of applications. Inductive coupling link has been validated as the most suitable and efficient means for wireless transfer of signal where coupling coefficient plays a crucial role to determine the strength of the transmission in power transfer. In view of that an urgent investigation of the relative magnetism of magnetic and nonmagnetic materials are required. This paper aims to analyse the magnetization effect of a magneto-inductive sensor based on the inductive coupling technique in low frequency range for different values of coupling coefficient. The results have appeared to show different magnetization behavior with the variation of coupling factors. The obtained hysteresis loops for different coupling factors are evaluated in this paper for suitable application.
    Computer and Communication Engineering (ICCCE), 2012 International Conference on; 01/2012
  • [Show abstract] [Hide abstract]
    ABSTRACT: Other than by reducing power, extending battery life in portable microelectronics amounts to increasing power efficiency, which, when coupled with accuracy, translates to increasing filter inductance. The problem with higher inductances is that magnetic cores require more space to prevent the onset of saturation, so accuracy and efficiency (via their need for bulky inductors) hamper the miniaturization benefits gained from chip integration. This paper illustrates the time-domain and efficiency effects of inductor saturation in switched-inductor DC–DC converters and shows how they can accommodate saturation (with up to 65% reduction in inductance) with minimal impact on battery life and accuracy. Extending the useful range of an inductor in this fashion not only reduces the printed circuit board (PCB) area and volume to a fraction (e.g., 30–50%) of what an otherwise larger unsaturated inductor would require, but also helps bridge the integration gap that enables practical system-on-chip (SoC) implementations. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
    IEEJ Transactions on Electrical and Electronic Engineering 01/2012; 7(1). DOI:10.1002/tee.21697 · 0.33 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The magnetic material when designing EMI filter determines the inductance value and the parasitic elements that influence the insertion loss effectiveness of the filter. Moreover, the EMI filter characterization is usually realized at low power levels (low current and low voltage). When the EMI filter is subjected to higher currents through its coils, the principal characteristics of the filter (inductance variation with current and frequency) are modified. To account for these variations in the design step, it is useful to take into account the hysteresis model that represents the inductive and dissipative effects. Therefore, in this paper, an approach combining a magnetic hysteresis model together with a concept of material capacitance is proposed. The model is identified from a single turn of flat copper ribbon (STFC) experimental setup. Then, the experimental data are modeled with the proposed hysteretic and capacitive material behavior model (HCM) that is implemented in an equivalent circuit modeling approach, accounting for both the magnetic behavior law together with the “material capacitance.” The robustness of the proposed approach is evaluated by comparison and validation with the experiment results, showing good representation of the inductive and partially the dissipative effects.
    IEEE Transactions on Power Electronics 09/2014; 29(9):4911-4920. DOI:10.1109/TPEL.2013.2288065 · 5.73 Impact Factor