Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1997-05-30
2000-03-07
Leja, Ronald W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
361 939, 333 171, H02H 900
Patent
active
060348550
ABSTRACT:
A circuit is described which maintains the current flowing toward a main circuit within a prescribed limit, regardless of instantaneous voltage or current changes. The circuit includes elements that maintain the current flow in a path toward a main circuit within a prescribed limit by selectively changing the impedance presented in response to any instantaneous change in the voltage flowing toward the main circuit and by introducing into the path a voltage which opposes any such instantaneous change in the current flowing toward the main circuit. Elements may also be provided to protect the main circuit by disconnecting same from a cable leading thereto after signals on the cable have been analyzed and a determination has been made that a signal outside of predetermined upper and lower limit values has been coupled to the cable, for example, from a high altitude electromagnetic pulse. Elements may also be provided to periodically trip and reset the protective circuit before the line to the main circuit is opened, so that an operating mode of the protective circuit can be tested without interrupting the power to the main circuit.
REFERENCES:
patent: 4020440 (1977-04-01), Moerman
patent: 4731691 (1988-03-01), Padwa
patent: 5144308 (1992-09-01), Norsworthy
patent: 5191331 (1993-03-01), Karema et al.
patent: 5353309 (1994-10-01), Agazzi et al.
patent: 5410310 (1995-04-01), Molnar
patent: 5530442 (1996-06-01), Norsworthy et al.
patent: 5530443 (1996-06-01), Borgen et al.
patent: 5579247 (1996-11-01), Kerth et al.
patent: 5673044 (1997-09-01), Pellon
patent: 5712874 (1998-01-01), Okamoto
patent: 5715125 (1998-02-01), Neiger et al.
patent: 5768315 (1998-06-01), Mittel et al.
patent: 5815102 (1998-09-01), Melanson
Leja Ronald W.
Lucent Technologies - Inc.
LandOfFree
Method and apparatus for attenuation of, and damage protection f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for attenuation of, and damage protection f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for attenuation of, and damage protection f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-368930