Circuit for multiplying resolution and for determining the direc

Details Circuit for multiplying resolution and for determining the direc Circuit for multiplying resolution and for determining the direc

1997-09-29

1999-09-21

Patidar, Jay

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

3242072, 32420725, 318489, 318466, 307122, G01P 1304, G01B 730, G01B 702, H02P 700

Patent

active

059558784

ABSTRACT:
A multipole magnetic encoder is movable past two fixed analog sensors delivering sinusoidal signals (S.sub.1, S.sub.2) phase-shifted by .pi./2. A generator produces 2n sinusoidal signals (S.sub.i) of the same amplitude (A) as the signals (S.sub.1, S.sub.2), phase-shifted by .pi.
. An analog multiplexer delivers a signal (S) consisting of 2n successive portions of signals (S.sub.i). An acquisition device determines a maximum envelope (E) of the signals (S.sub.i). Two of switching thresholds (L.sub.i) and (L.sub.j) are generated proportional to the envelope (E). Two comparators compare the signal (S) with the thresholds (L.sub.i) and (L.sub.j), and deliver binary signals (A.sub.i) and (B.sub.j). Two combining devices combine the binary signals (A.sub.i) and (B.sub.j), each delivering a high resolution signal of 2m*n periods in the interval of one period of one of the sensors.

REFERENCES:
patent: 5345171 (1994-09-01), Simmons et al.
patent: 5500585 (1996-03-01), Aab

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