Device for analyzing an alternating voltage or current including a variable D.C. component
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United States of America Patent
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Nov 14, 2000
Grant Date -
N/A
app pub date -
Jul 28, 1998
filing date -
Jul 31, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
The analysis or evaluation circuit for analyzing an alternating voltage or current signal that includes a D.C. voltage or D.C. current component includes a window comparator having a circuit portion for comparing the alternating voltage or current signal to an upper threshold and a lower threshold and another circuit portion for adjusting the upper and lower threshold when one of the upper and the lower thresholds is reached by the alternating voltage or current signal. By means of a VCL output signal that switches when a threshold adjustment occurs, a frequency dependent signal may be produced that can be analyzed to obtain a rotational speed of a rotational body from which the input alternating voltage or current is derived.
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