Sensing a back electromotive force of a motor

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9166507
APP PUB NO 20150188465A1
SERIAL NO

14140997

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An apparatus includes a controller and a comparator. The controller generates pulse width modulation (PWM) signals to drive stator windings of a brushless direct current (BLDC) motor in a commutation sequence such that one of the stator windings at a given time is open; and generates a tracking signal synchronized to the PWM signals and indicative of times when a leakage current is present in the open stator winding. The comparator senses when a back electromotive force of the open stator winding has an associated zero crossing. The sensing by the comparator is selectively enabled and disabled by the tracking signal.

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Patent Owner(s)

  • SILICON LABORATORIES INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Soh, Kok Hong Serangoon North, SG 4 56

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