Reducing stray magnetic field effects using a magnetic field feedback

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United States of America Patent

PATENT NO 11467235
SERIAL NO

17333235

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Abstract

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In one aspect, a magnetic-field sensor includes main coil circuitry configured to generate a first magnetic-field signal at a first frequency; a first channel; a second channel; a subtractor circuit configured to subtract a second channel output signal from a first channel output signal to form a subtraction signal; an adder circuit configured to combine the first channel output signal and the second channel output signal to form a summation signal; processing circuitry configured to receive the summation signal and to provide a magnetic-field sensor output signal indicating a position of the target; feedback circuitry configured to receive the subtraction signal and to provide a first feedback signal to the processing circuitry, and a second feedback signal; and a secondary coil circuitry configured to receive the second feedback signal and to generate, based on the second feedback signal, a second magnetic-field signal to reduce the first magnetic-field signal received.

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Patent Owner(s)

  • ALLEGRO MICROSYSTEMS, LLC

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Alpago, Octavio H Ciudad de Buenos Aires, AR 17 65
Romero, Hernán D Buenos Aires, AR 36 110

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