Subterranean two-wire power and communications network

Details Subterranean two-wire power and communications network Subterranean two-wire power and communications network

2006-08-15

2006-08-15

Edwards, Jr., Timothy (Department: 2612)

Communications: electrical

Systems

Selsyn type

C370S479000, C375S257000, C137S078300

Reexamination Certificate

active

07091830

ABSTRACT:
A combination of frequency and time division multiplexed signals communicates using bursts of higher frequency sinusoidal waves superimposed upon the alternating current in a two-wire power distribution network. A synchronization pattern precedes data, all bursts having the same frequency to overcome problems caused by varying reactances, and all bursts being confined within negative half-cycles of the AC power. Such networks minimize the amount of wire needed to connect large numbers of devices to a common controller while covering large distances, and requiring no particular connection pattern or terminations, whether near the surface, above ground, or in deep earth wells. In an irrigation system they accommodate at once solenoid valves and distributed environmental sensors. Landscape changes that would otherwise require new wiring to accommodate new irrigation zones are facilitated by merely tapping into the two-wire communications lines at the nearest accessible point. Outdoor lighting controls and security sensors are easily accommodated.

REFERENCES:
patent: 3665474 (1972-05-01), Thayer
patent: 3689886 (1972-09-01), Durkee
patent: 4200862 (1980-04-01), Campbell et al.
patent: 4300126 (1981-11-01), Gajjar
patent: 4328482 (1982-05-01), Belcher et al.
patent: 4329678 (1982-05-01), Hatfield
patent: 4528667 (1985-07-01), Fruhauf
patent: 4553247 (1985-11-01), Harris
patent: 4815106 (1989-03-01), Propp et al.
patent: 5089974 (1992-02-01), Demeyer et al.
patent: 5491463 (1996-02-01), Sargeant et al.
patent: 5546974 (1996-08-01), Bireley
patent: 5614811 (1997-03-01), Sagalovich et al.
patent: 6188314 (2001-02-01), Wallace et al.
patent: 6657443 (2003-12-01), Anderson
patent: 6747463 (2004-06-01), Rynhart et al.
patent: 6798215 (2004-09-01), DeHart
patent: 6831468 (2004-12-01), Anderson et al.
patent: 2003/0097482 (2003-05-01), DeHart et al.

Affiliated with

Also associated with

Rating

Subterranean two-wire power and communications network does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Subterranean two-wire power and communications network, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subterranean two-wire power and communications network will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3663430