Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1994-12-16
1997-03-25
Phillips, Michael W.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
3613015, 3613063, 3613212, 361322, 361312, 361305, H01G 406, H01G 4008
Patent
active
056150784
ABSTRACT:
A film capacitor in which the unmetallized margin is provided with a semiconductive layer. The layer provides a parallel resistive path within the capacitor, itself, obviating the need for an external resistor. It also grades the electric field across the margin, i.e., makes the field more uniform, thus allowing the margin to be made narrower without electrical breakdown, permitting a reduction in the physical size of the capacitor. A refractory, semiconductive layer is provided between the metal layer and the dielectric film. The refractory layer accelerates the self-clearing process, by insulating the underlying dielectric film from the heat generated by the vaporizing metal, thus hastening vaporization and reducing the tendency of the dielectric film to carbonize. As a result, faults are cleared with substantially less energy consumption. Preferably, the refractory layer is also semiconductive, to reduce field emission effects, and thereby decrease the frequency of faults in the dielectric film.
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Hatada Kenji
Hudis Martin
Koebisu Mamoru
Aerovox Incorporated
Dinkins Anthony
Phillips Michael W.
Toray Industries, Inc
Toray Plastics (America) Inc.
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