Coupling power line communications signals around distribution transformers
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United States of America Patent
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-
Sep 25, 1984
Grant Date -
N/A
app pub date -
Apr 13, 1982
filing date -
Apr 13, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit is described for bi-directionally coupling a communication signal around a distribution transformer. The circuit includes a single-phase coupling transformer with a primary to secondary voltage ratio approximately equal to that of the distribution transformer. A capacitor is connected to one of the secondary terminals of the coupling transformer. The capacitor is chosen so that the series circuit including the capacitor, the self inductance of the coupling transformer and, possibly, the series inductance of interconnecting lines is resonant at the carrier frequency of the communications signal. The series combination of the capacitor and the secondary of the coupling transformer can be connected between two of the conductors on the secondary side of the distribution transformer which are selected for communication signal propagation.
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