Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Reexamination Certificate
2007-05-10
2011-12-20
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
C375S354000, C375S356000
Reexamination Certificate
active
08081726
ABSTRACT:
A time synchronization device (TSD) that produces a synchronization signal and couples it onto energized power conductors in a power monitoring system. Monitoring devices coupled to the TSD include frequency detection algorithms, such as a Goertzel filter, for detecting the synchronization signal and interpreting the information encoded in the signal. The frequency of the synchronization signal may correspond to the fourth or tenth harmonic component of the fundamental frequency of the voltage on the power conductors. The magnitude of the signal is selected to be above the expected or established noise floor of the power monitoring system plus a predetermined threshold. The duration of the signal can be varied, such as lasting a full cycle of the fundamental frequency. Multiple TSD signals received in a predetermined sequence may be converted into digital words that convey time, configuration, reset, control, or other information to the monitoring device.
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Ashby E. Avery
Bickel Jon A.
Liu Shuwang
Neff Michael
Schneider Electric USA , Inc.
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