Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1984-03-05
1985-10-15
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
29 2542, H01G 114, H01G 700
Patent
active
045478325
ABSTRACT:
A method is disclosed for making a wound capacitor having decreased inherent inductance and a high self-resonant frequency. In making this capacitor, metallized film is wound around a non-conductive polycarbonate core and a conductor is inserted through the entire length of the core. The wound metallized film is flattened and terminals are formed at opposite ends of the flattened wound capacitor. The conductor is folded over and electrically connected to one terminal and a metal contact is electrically connected to the other terminal. The electromagnetic field created around the conductor is approximately equal and in the opposite direction to the electromagnetic field created around the wound metallized film. Therefore, the inductive reactance of the conductor and the inductive reactance of the wound film are approximately equal. These reactances approximately cancel resulting in increased self-resonant frequency.
REFERENCES:
patent: 3364401 (1968-01-01), Rayburn
patent: 3513369 (1970-05-01), England et al.
patent: 4345298 (1982-08-01), Grahame
patent: 4477953 (1984-10-01), Lobo et al.
Electronic Concepts Inc.
Griffin Donald A.
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