Phase detecting device for determining phase angle between two electrical signals
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United States of America Patent
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-
May 28, 1996
Issued Date -
N/A
app pub date -
May 16, 1995
filing date -
Aug 23, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A transmitting box is connected to a first electrical outlet in a building. The phase of the first electrical outlet is used as the reference phase. The transmitter box senses each of the zero-cross-overs of the reference phase and injects a data packet of the data carrier frequency at each zero-cross-over. A receiving box is connected to a second electrical outlet in the building. The second electrical outlet has an unknown phase which may be different from the reference phase. The receiver box receives each data packet and senses each phase zero-cross-over of the unknown phase. The receiver box uses the time between each reception of a data packet and each detection of an unknown phase zero-cross-over to determine the phase angle of the unknown phase relative to the reference phase.
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