Digital data transmission
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United States of America Patent
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-
May 11, 1993
Grant Date -
N/A
app pub date -
May 20, 1991
filing date -
Jun 22, 1990
priority date (Note) -
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Abstract
A method and apparatus for transmitting data over a power line (2) and having particular application for flight control networks. The method enables bi-directional transmission of data over either DC or AC power lines. Transformers (T.sub.3, T.sub.4) used for coupling data onto and from the power lines (2) comprise three windings (L.sub.1, L.sub.2 and L.sub.3) and a ferrite core. Saturation of the core is avoided by arranging for the load current to flow in opposite senses through two (L.sub.1 and L.sub.2) of the windings. By choosing the number of turns of the two windings to be equal, complete cancellation of DC flux inside the core is possible.
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