Electricity: electrical systems and devices – Safety and protection of systems and devices – High voltage dissipation
Patent
1991-09-03
1996-02-20
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
High voltage dissipation
361 56, 361113, 361127, H02H 906
Patent
active
054934699
ABSTRACT:
Surge protection for a data transmission line, typically a telephone line including two data signal conductors, incorporates a primary protector circuit for high voltage, high energy surges and a secondary protector circuit for low voltage surges. The primary protector circuit includes a normally non-conductive "breakdown" or "crowbar" device having a high breakdown voltage, a solid-state triac, or a thyristor, driven conductive by a surge exceeding its breakdown voltage; the crowbar device is connected from one or both conductors to ground. An inductance is connected in the circuit to extend the time in which the circuit reduces a surge to near zero voltage, and thus dissipates power from the surge. The second protector circuit includes at least one avalanche diode, Zener diode, or other threshold device in parallel with the primary protector circuit. The threshold device(s) in the secondary circuit have thresholds much lower than the primary breakdown voltage; typical values are ten to seventy volts for the threshold devices and two to three hundred volts for the primary breakdown devices. In all instances, impedances, particularly resistances, in series in the data signal conductors are avoided. The spacing between the primary and secondary protector circuits is at least two meters.
REFERENCES:
patent: 3973224 (1976-08-01), Gaule et al.
patent: 4079211 (1978-03-01), Janssen
patent: 4161008 (1979-07-01), Zimmermann et al.
patent: 4254442 (1981-08-01), Dijkmans et al.
patent: 4449157 (1984-05-01), Chow
patent: 4586104 (1986-04-01), Standler
patent: 4632762 (1986-11-01), Boeckmann et al.
patent: 4661878 (1987-04-01), Brown et al.
patent: 4675772 (1987-06-01), Epstein
patent: 4695916 (1987-09-01), Satoh et al.
patent: 4758920 (1988-07-01), McCartney
patent: 4808843 (1989-02-01), Hedin
patent: 4849846 (1989-07-01), Hung et al.
patent: 4878145 (1989-10-01), Lace
patent: 4887180 (1989-12-01), Climent et al.
patent: 4941063 (1990-07-01), McCartney et al.
DeBoer Todd
Dorn Thomas E.
Lace Mildred A.
LandOfFree
Surge protection for data lines does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surge protection for data lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surge protection for data lines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1361002