17.Dielectrics and Electrical Insulation by John G. Webster (Editor)

By John G. Webster (Editor)

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The big commercial development has been the metallization of segmented patterns with highspeed manufacturing processes. Dielectric film coatings, used either as a substrate for the metallization layer or a protected coating on top of the metallization layer, have also been used during the past 10 years. Although this is not a metallizing technology, coated dielectric film can interact with the metallized layer during the humidity corrosion process and/or 24 CAPACITOR INSULATION during the clearing process resulting in improved performance.

Competitive Advantages of Higher Power Density Capacitor Technology A major factor in designing the next generation of advanced power conditioning systems and switched-mode power sup- plies is selecting available high-power density components (7,14,15,18,19–21). Observations over recent years have shown that a technically highly demanding area is the application of capacitors for switched-mode power supplies and switching regulators, mainly in the areas of dc input and output filtering, as well as resonant elements internal to the power conditioning system (2,8,11,14).

Though this constant is relatively small, the dielectric thicknesses are also extremely thin, and the surface area of the porous block is extremely high. The thickness is controlled by the process allowing different ratings for different bias applications. The volumetric efficiency of this capacitor exceeds that of aluminum electrolytics. The counterelectrode or cathode plate is formed by the electrolyte in the wet tantalums. This solution readily penetrates the porous anode and forms itself to the exposed Ta2O5 surfaces.

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