Communications: electrical – Systems – Selsyn type
Reexamination Certificate
1999-03-25
2003-03-04
Swarthout, Brent A. (Department: 2632)
Communications: electrical
Systems
Selsyn type
C340S315000, C340S315000
Reexamination Certificate
active
06529120
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a system for communicating over a transmission line, in particular, single phase and multi-phase power lines.
U.S. Pat. No. 5,723,848 describes a method and system for controlling heating cables, wherein information is transmitted between a main controller and remote terminals over power lines by spread spectrum data transmission.
It is desirable, when implementing a system such as that described in the aforementioned U.S. patent, to be able to make the connections to the power lines with the least amount of wiring and disruption to the power system.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide new methods and devices for transmitting and/or receiving an information signal using a transmission line, such as a power line, by minimizing the wiring and disruption necessary to transmit a signal over the transmission line and receive a signal therefrom.
Another object of the present invention is to provide a system for communicating over a transmission line utilizing the methods and devices of the present invention.
In accordance with the present invention, a device is used for both applying a current signal corresponding to an information signal to a transmission line and for sensing a current signal corresponding to an information signal from a transmission line. The device comprises a ferrite core which surrounds the transmission line and has at least one winding extending through the core and connected to a transceiver. The permeability of the core and the number of turns of the winding extending through the core is based on the amount of noise in the system and the type of transmission line being used in the system. Moreover, for better termination of the transmitted signal, a capacitor can be connected in the vicinity of the core from the transmission line to ground. The value of the capacitance is also selected based upon the characteristics of the system.
In accordance with the invention, the ferrite core is a solid or split core and the transmission line is preferably one or more phases of a multi-phase feeder of 120 volts, 460 volts, 10 kilovolts, etc. The information signal applied to the winding and received from the winding of each core is preferably a spread spectrum transmission signal, but can be a narrow band signal with frequency shift keying (FSK), amplitude shift keying (ASK) or other transmission modulation scheme.
These and other objects and advantages of the present invention are achieved in accordance with the present invention as described hereinafter in more detail with regard to the attached drawings, wherein:
REFERENCES:
patent: 3848159 (1974-11-01), Nye, Jr. et al.
patent: 3895370 (1975-07-01), Valentini
patent: 4075675 (1978-02-01), Burkett et al.
patent: 4210901 (1980-07-01), Whyte et al.
patent: 4745391 (1988-05-01), Gajjar
patent: 4903006 (1990-02-01), Boomgaard
patent: 5257006 (1993-10-01), Graham et al.
patent: 5559377 (1996-09-01), Abraham
patent: 5892758 (1999-04-01), Argyroudis
patent: 0156660 (1982-09-01), None
Bilenko George
Zelmanovich Helena
Clifford Chance (US) LLP
Intech 21, Inc.
Schaefer Ira J.
Swarthout Brent A.
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