Systems for transmitting information in an alternating current electricity supply system
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United States of America Patent
Stats
-
Mar 3, 1981
Issued Date -
N/A
app pub date -
Aug 6, 1979
filing date -
Jul 18, 1974
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for transmitting information in an alternating current supply system wherein information is transmitted by reducing the instantaneous value of the supply voltage during a corresponding period in each of a selection of cycles of the supply voltage, the selection of cycles determining the information transmitted. To minimize disturbance of the system voltage the period of alteration includes a voltage zero. The alteration is effected by closing a switch connected across the system for the period the voltage reduction is required.
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