Communications: electrical – Systems – Selsyn type
Patent
1980-04-03
1983-08-09
Groody, James J.
Communications: electrical
Systems
Selsyn type
307 3, 34082562, H04B 354
Patent
active
043981780
ABSTRACT:
In a system for transmitting information on an a.c. line from a transmitter unit to a receiver unit which is connected to the line at a great distance from the a.c. source supplying said line than the transmitter unit, information is transmitted on one of the phase conductors of the line in a form of a series of short-duration pulse-like amplitude reductions in the alternating voltage waveform on said phase conductor during one and the same half cycle of the waveform, whereat the pulses are mutually arranged in the pulse series to form a binary code word representing the desired information. The short-duration pulse-like amplitude reductions in the alternating voltage waveform are generated by means of a current transformer (14), whose primary winding is connected in series with the phase conductor (4) and whose secondary winding is short circuited by means of a switching transistor (15) controlled by a control unit (6) to be opened for a short duration for each desired pulse in the series of information pulses. When the transistor (15) is opened, a voltage regulator (17) connected across the secondary winding of the transformer restricts the change in magnetic flux in the transformer core to a maximum value dependent upon the length of the pulse series. A current regulator (27) is arranged to sense the current flowing through the phase conductor and the primary winding of the current transformer and, by connecting a load (28) to the phase conductor (4) on the side of the current transformer remote from the a.c. source (1), to hold the current through the primary winding of the current transformer over a given minimum value during the half cycle of the alternating voltage waveform when a series of information pulses is to be transmitted.
REFERENCES:
patent: 3488517 (1970-01-01), Cowan et al.
patent: 3714451 (1973-01-01), Whitney et al.
patent: 3721830 (1973-03-01), Oishi et al.
patent: 3818466 (1974-06-01), Honda
patent: 4024528 (1977-05-01), Boggs et al.
patent: 4131882 (1978-12-01), Hollagaugh et al.
patent: 4200862 (1980-04-01), Campbell et al.
Lindberg Lars G. S.
Russ Arild
Sjostrand Pehr-Olof G.
Sternberg Ingvar P.
Groody James J.
Handelsbolaget Light Regulation
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