Repeater coupler for power line communication systems

Details Repeater coupler for power line communication systems Repeater coupler for power line communication systems

1975-05-27

1976-06-08

Robinson, Thomas A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340310R, H04H 108

Patent

active

039625478

ABSTRACT:
Apparatus for connecting separate transmitters of a carrier communication system to the same location on a power distribution line. A low-power transmitter is connected to the primary winding of an interconnecting transformer. The secondary winding of the interconnecting transformer is connected between a high-power transmitter and, through the primary winding of a coupling transformer, to ground potential. The secondary winding of the coupling transformer is coupled to the power distribution line. A voltage limiting device is connected across the secondary winding of the interconnecting transformer. The output of the high-power transmitter is directed across the voltage limiting device to the coupling transformer where it is applied to the distribution line. When the low-power transmitter is turned on and the drive signal to the high-power transmitter is turned off, the power from the low-power transmitter is transferred to the secondary winding of the interconnecting transformer and to the coupling transformer where it is applied to the distribution line. The high-power transmitter represents a virtual ground potential when it is not transmitting, thereby providing a closed circuit path for the power delivered by the low-power transmitter.

REFERENCES:
patent: 1705903 (1929-03-01), Davee
patent: 2481915 (1949-09-01), Edson et al.
patent: 2510271 (1950-06-01), Almquist
patent: 2516211 (1950-07-01), Hochgraf

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