MAGNETIC FIELD SENSORS AND OUTPUT SIGNAL FORMATS FOR A MAGNETIC FIELD SENSOR

WIPO Patent Application WO/2017/201002

A3

An apparatus and a method provide an output signal indicative of a speed of rotation and/or a direction of movement of a ferromagnetic object having ferromagnetic features and capable of moving. A variety of signal formats of the output signal are described, each of which have pulses at a rate faster than the ferromagnetic features pass by the magnetic field sensor. The output signal can comprise PWM pulses having pulse widths changing in relation to the current amplitude of the field signal. The output signal can comprise PWM pulses having a width linearly increasing or decreasing within a period of the field signal. The output signal can comprise a predetermined number of pulses within each period of the signal. The field signal from two channels can be converted to a phase value using a CORDIC module generating an arctan signal. This arctan signal can be subsequently compared with a number of thresholds. The output signal can comprise pulses having a fixed frequency independent of the speed, within each period of the field signal.

BURDETTE ERIC (US)
DAVID PAUL A (US)
GRAHAM CHRISTINE M (US)
PRENTICE SETH (US)

PCT/US2017/032840

December 28, 2017

May 16, 2017

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ALLEGRO MICROSYSTEMS LLC (US)

G01P3/489; G01P13/04

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ROBINSON, Kermit et al. (US)

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