Device for analyzing an alternating voltage or current including

Details Device for analyzing an alternating voltage or current including Device for analyzing an alternating voltage or current including

1998-07-28

2000-11-14

Oda, Christine K

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324173, 32420712, G01P 348

Patent

active

06147486&

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.

REFERENCES:
patent: 5103171 (1992-04-01), Petersen
patent: 5554948 (1996-09-01), Hansen et al.
patent: 5650719 (1997-07-01), Moody et al.
patent: 5917320 (1999-06-01), Scheller et al.
patent: 5926016 (1999-07-01), Pattantyus

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