Critically damped capacitor and method of making same

Details Critically damped capacitor and method of making same Critically damped capacitor and method of making same

1991-04-22

1992-09-01

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

29 2542, H01G 400, H01G 700

Patent

active

051445220

ABSTRACT:
A critically damped capacitor comprising a capacitance C having in series therewith a parasitic inductance L.sub.S, a parasitic resistance R.sub.S and an additional resistance R.sub.A in series with the plates of the capacitor. The value of R.sub.A is chosen such that ##EQU1## The additional resistance R.sub.A in one embodiment is provided by a layer of conductive epoxy which is attached or added to one or both of the end plates of the capacitor. Electrical leads are coupled to the end plate having the epoxy by being embedded in the epoxy. If epoxy is not used on an end plate, the lead is coupled to the end plate in a conventional manner. In another embodiment the additional resistance R.sub.A is provided by a discrete resistor which is welded, soldered or otherwise attached to one or both of the end plates. If only one resistor is used, one lead of the capacitor is coupled to its end plate in a conventional manner and the second lead is coupled to the free end of the resistor. In one embodiment, the resistor is enclosed and the ends of the capacitor sealed by a non-electrically conductive epoxy. In another embodiment, the capacitor and resistor are enclosed within a container filled with non-conductive epoxy and the leads of the capacitor extend externally therefrom in a conventional manner so as to form an integrated capacitive element or device.

REFERENCES:
patent: 1324792 (1919-12-01), Booth
patent: 2636920 (1953-04-01), Lockery et al.
patent: 3236936 (1966-02-01), Robinson
patent: 3394386 (1968-07-01), Weller et al.

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