H. Bergsma

University of Nottingham, Nottigham, England, United Kingdom

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Publications (9)1.14 Total impact

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    ABSTRACT: This work presents the use of unscented transforms (UT) for the description of statistical uncertainty in electromagnetic coupling between cables. UT greatly reduce the computational burden for the statistical analysis of nonlinear problems compared with more traditional approaches such as the Monte Carlo technique. Coupling between cables has a nonlinear parameter dependence and has a high variability due to the variability in the cable braid manufacture and the highly variable nature of cable layout. Therefore, cable coupling can only be defined within statistical limits. First, it is shown that by analyzing the resonances the important features of maximum coupling and the point of maximum coupling can be characterized. It is then demonstrated how UT can be used to efficiently identify the parameters which contribute significantly to the uncertainty in cable coupling and then to provide a measure of the probability distribution for the multivariate problem.
    Annales des Télécommunications. 01/2011; 66:475-482.
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    ABSTRACT: In this paper the crosstalk between two parallel coaxial cables is investigated. It is shown that the degree of coupling is strongly effected by the geometry of the system. In many practical situations the geometry of the cable routing is ill-defined so that an exact deterministic solution is not possible or helpful. A simple solution based on the first resonant frequency is proposed which can also be used to provide some statistical analysis of the possible degree of cable coupling.
    01/2009;
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    ABSTRACT: Comparisons of evaluated and actual performances of common mode chokes are presented. The evaluated performances are based on a new behavioural model for common mode chokes and the identification of its uncertainties to evaluate the upper and lower limits of the final attenuation. Results are compared with the final performances of the choke placed in a circuit. The behavioral model is essential in simulation of EMI effects.
    Electromagnetic Compatibility - EMC Europe, 2008 International Symposium on; 10/2008
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    ABSTRACT: Optimization aspects of common mode chokes are presented. These are based on a behavioural model for common mode chokes and its sensitivity study. Results are used to show the influence of the designable parameters on the final performance of the choke placed in a circuit.
    Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility, 2008. APEMC 2008. Asia-Pacific Symposium on; 06/2008
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    A. Roc'h, H. Bergsma, F.B.J. Leferink
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    ABSTRACT: A well designed common mode filter for motor drive application can significantly improve the level of electromagnetic interference generated by the cable and the motor housing. The subsequent design of this filter is strongly dependent on the actual in situ parameters of the motor drive and often leads to a “cut and try��? process. To simplify this process a novel behavioral model for common mode choke (CMC) is proposed. The model can be used to show the influence of the designable parameters on the final performance of the choke placed in a circuit. The identification of the model uncertainties can be used to evaluate the upper and lower limits of the final attenuation.
    01/2008;
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    ABSTRACT: Un model comportemental pour l’évaluation des performances de choke de mode commun (CMC) est proposé : la topologie et les méthodes utilisés pour modéliser les différentes propriétés de la CMC sont décrites. Il s’agit de la combinaison d’une modélisation précise de la perméabilité complexe du matériau, de la saturation, des inductances de fuite et des capacités parasites. Les données necessaries fournies par le designer sont les valeurs de courants, tensions et impédances du système actuel sans CMC et des paramètres disponibles dans la littérature et /ou des manufacturiers en ce qui concerne la CMC modélisée. Ce model comportemental s’avère essentiel dans la simulation des effets des interférences électromagnétiques (EMI).
    Journal of Vacuum Science & Technology A - J VAC SCI TECHNOL A. 01/2008;
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    ABSTRACT: A behavioural model for performance evaluation of a common mode choke (CMC) is proposed: the topology and methods used to model the different properties of the CMC are presented. It combines an accurate model of the complex permeability, of the saturation, of leakage inductances and of parasitic capacitances. Inputs needed from the designer are measured values of currents, voltages and impedance of the actual system, and parameters available in literature and/or from manufacturers for the modelled CMC. The behavioural model is essential in simulation of EMI effects.
    Electromagnetic Compatibility, 2007. EMC Zurich 2007. 18th International Zurich Symposium on; 10/2007
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    ABSTRACT: A filter has been designed to reduce conducted and radiated emission generated by a frequency converter. The frequency converter, cables and motor were modelled in order to make a good estimation of the radiated emission. A single stage output filter was designed making use of feedthrough apacitors and a nano-crystalline iron particles common mode choke. This choke has a high saturation level, comparable to a conventional iron inductor, and a high permeability, compared to conventional ferrite, i.e. combining the best of both materials. Measurements have shown that such a filter is very effective.
    Microelectronics Reliability 01/2006; · 1.14 Impact Factor
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    ABSTRACT: Shielding effectiveness measurements have been performed using a reverberation chamber. The reverberation chamber methodology as well as the measurement setup is described and some results are given. Samples include glass reinforced plastic panels, aluminum panels with many holes, wire mesh, among others. The reverberation chamber setup gives very repeatable measurement results
    Electromagnetic Compatibility, 2006. EMC-Zurich 2006. 17th International Zurich Symposium on; 01/2006