Circuit protection device

Details Circuit protection device Circuit protection device

2005-03-15

2005-03-15

Easthom, Karl D. (Department: 2832)

Electrical resistors

Resistance value responsive to a condition

Force-actuated

C338S099000, C338S111000, C338S101000, C338S103000

Reexamination Certificate

active

06867681

ABSTRACT:
A current control device is described wherein a pressure conduction composite is compressed and decompressed to alter its conductivity and thereby current conduction through the device. The pressure conduction composite is composed of a nonconductive matrix, a conductive filler, and an additive. The invention consists of electrodes and pressure plates contacting the composite. Electrically activated actuators apply a force onto pressures plates. Actuators are composed of a piezoelectric, piezoceramic, electrostrictive, magnetostrictive, and shape memory materials, capable of extending and/or contracting thereby altering pressure and consequently resistivity within the composite. In an alternate embodiment, two or more current control devices are electrically coupled parallel to increase power handling.

REFERENCES:
patent: 3882442 (1975-05-01), Hubbard
patent: RE28595 (1975-10-01), DuRocher
patent: 4163204 (1979-07-01), Sado et al.
patent: 5644283 (1997-07-01), Grosse-Wilde et al.
patent: 6798332 (2004-09-01), Bower et al.

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