Rotary speed sensor with base line compensation of Hall cell out

Details Rotary speed sensor with base line compensation of Hall cell out Rotary speed sensor with base line compensation of Hall cell out

1989-07-18

1991-02-12

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

32420712, 3242072, 32420725, 307309, 338 32H, G01B 714, G01P 348, G01P 354

Patent

active

049927310

ABSTRACT:
A rotary speed sensor system uses a permanent magnet and a Hall cell sensitive to the changing tangential component of magnetic field caused by the interrupted surface profile of a rotary element. In order to avoid anomalies caused by the variation of the base value of the tangential component of magnetic field, the output of a differential amplifier fed by the Hall cell is connected to a voltage averaging circuit which stores the average voltage of the output on a single capacitor. The output of the differential amplifier and the voltage across the capacitor are respectively coupled to the differential inputs of a Schmitt trigger exhibiting hysteresis. The Schmitt trigger thereby establishes operate and release points relative to the average voltage signal. The voltage averaging circuit is a non-linear circuit in which the voltage across the capacitor is fed back to the negative input of an operational amplifier. A power-up circuit is also provided for rapidly charging the capacitor initially to approximately the average voltage.

REFERENCES:
patent: 4293814 (1981-10-01), Boyer
patent: 4481469 (1984-11-01), Hauler et al.

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