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Aluminium Electrolytic Capacitor

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Denes Fodor – One of the best experts on this subject based on the ideXlab platform.

  • Degradation Analysis of DC-Link Aluminium Electrolytic Capacitors Operating in PWM Power Converters
    Advances in Electrical and Electronic Engineering, 2020
    Co-Authors: Krisztian Enisz, László Kovács, Denes Fodor, Gabor Kohlrusz, Richard Marschalko

    Abstract:

    The most common failure mode of Aluminium Electrolytic Capacitor is the so-called wear out fault. It is caused by the high core temperature of the Capacitor. Therefore, life cycle calculations generally use temperature data to estimate degradation level. Core temperature-based life cycle calculations can consider different current loads on Capacitors. The calculation method uses scaling factors for different ripple current waveforms. However, it is not observed that temperature only is responsible for aging, but current waveform also influences the level of degradation. Therefore, sinusoidal and PWM-loaded Capacitor tests were performed under the same temperature conditions. The results show that the pore distribution of Aluminium anode foil has changed during the test. The pore diameter reduces and it leads to an increase in the ESR value and decrease in the capacitance, electrolyte amount and weight. Comparative results show that the PWM-loaded Capacitor is more degraded than the Capacitor loaded by sinusoidal test current.

  • Aluminium Electrolytic Capacitor Model for Capacitor Materials Structure Transformation Analysis in PWM Applications
    2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC), 2018
    Co-Authors: László Kovács, Gabor Kohlrusz, Krisztian Enisz, Denes Fodor

    Abstract:

    The Electrolytic Capacitor is widely used in power electronics applications. These converters mainly operate with PWM (Pulse Width Modulation) which is commonly used circuit control technique currently. The widely known and generally used Capacitor models can not represent or model the exact behavior of the component in switch mode applications. Consequently, the physical structure of the Capacitor is not represented properly. A novel model has been introduced which represents precisely the physical structure of the Capacitor taking into account all structural elements. The electrical behavior of the novel model has been validated by circuit simulations. Utilizing the model, simulation results provided detailed information of component stress which helps to find an explanation to the effects of electrochemical processes in Capacitors.

  • Influence of Can Flatness on Heat Dissipation of Aluminium Electrolytic Capacitor
    Hungarian Journal of Industrial Chemistry, 2013
    Co-Authors: László Kovács, László Gál, Denes Fodor

    Abstract:

    The lifetime of Aluminium Electrolytic Capacitors highly depends on their core temperature. Heat dissipation in general applications happens by the extended cathode, which is in contact with the inner side of the can. In the case of heat sink applications, the most important heat transfer phenomenon is the heat conduction through the bottom of the Aluminium can. The quantity of the dissipated heat is in direct proportion to the size of the heat transfer surface. The more dissipated heat may increase the lifetime of the Capacitor. Therefore, the flatness value of the can bottom is critical. This paper presents a flatness measurement method, which can successfully replace the equipment for a more complex and more expensive 3D measurement. It discusses an implementation of a measurement environment, where data acquisition and visualization are automated by a LabVIEW-based software. In addition, this study deals briefly with the influence of production processes on the flatness value of the Capacitor produced by leading manufacturers.

H. Uchi – One of the best experts on this subject based on the ideXlab platform.

  • Modelling the capacitance of d.c. etched Aluminium Electrolytic Capacitor foil
    Journal of Applied Electrochemistry, 2000
    Co-Authors: D. G. W. Goad, H. Uchi

    Abstract:

    A model for the capacitance of anode foil used in Aluminium Electrolytic Capacitors is compared with experimental data for commercial foils from two different manufacturers. These foils are obtained by anodic electrochemical etching to produce a porous tunnel etched structure, followed by formation of a layer of dielectric Aluminium oxide in the pores. Data for the density and size of tunnels is obtained by sectioning the foil parallel to its surface with an ultramicrotome to several depths. In this paper the internal structure is modelled as a spatially random collection of hollow dielectric cylinders. Comparison of the measured capacitance with that calculated from the dimensional data and the model are in good agreement. The model predicts optimum values for tunnel size and density as a function of oxide thickness.

D. G. W. Goad – One of the best experts on this subject based on the ideXlab platform.

  • Modelling the capacitance of d.c. etched Aluminium Electrolytic Capacitor foil
    Journal of Applied Electrochemistry, 2000
    Co-Authors: D. G. W. Goad, H. Uchi

    Abstract:

    A model for the capacitance of anode foil used in Aluminium Electrolytic Capacitors is compared with experimental data for commercial foils from two different manufacturers. These foils are obtained by anodic electrochemical etching to produce a porous tunnel etched structure, followed by formation of a layer of dielectric Aluminium oxide in the pores. Data for the density and size of tunnels is obtained by sectioning the foil parallel to its surface with an ultramicrotome to several depths. In this paper the internal structure is modelled as a spatially random collection of hollow dielectric cylinders. Comparison of the measured capacitance with that calculated from the dimensional data and the model are in good agreement. The model predicts optimum values for tunnel size and density as a function of oxide thickness.