Line frequency synchronization
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United States of America Patent
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Jun 29, 2010
Grant Date -
Feb 14, 2008
app pub date -
Mar 21, 2007
filing date -
Mar 24, 2006
priority date (Note) -
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Abstract
This invention relates to line frequency synchronisation for use in diagnostics for alternating current electrical circuits. The invention provides a method of synchronising measurement system frequency with an alternating current line frequency comprising the steps of: adjusting the frequency of the measurement system frequency using a frequency locked loop until the measurement system frequency is within a predetermined range of said alternating current line frequency; and when the measurement system frequency is within a predetermined range of said alternating current line frequency adjusting the phase and the frequency of the measurement system frequency using a phase and frequency locked loop.
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