Haptics adaptive duty cycle

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United States of America Patent

PATENT NO 11392204
SERIAL NO

17031771

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Abstract

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Disclosed are various techniques operating a linear resonant actuator (LRA). In some aspects, a method for operating an LRA includes generating an LRA control signal having a period, the period having an active portion and a high-Z portion according to a duty cycle; detecting, during the high-Z portion of the period, a back electromotive force (BEMF) threshold voltage crossing time and zero voltage crossing time; calculating a period; calculating a BEMF measurement window; calculating a target duty cycle based on the period, the BEMF measurement window, and a margin time; and adjusting the duty cycle of the LRA control signal towards the target duty cycle.

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Patent Owner(s)

Patent OwnerAddress
QUALCOMM INCORPORATED5775 MOREHOUSE DRIVE SAN DIEGO CA 92121-1714

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Halagur, Shivaprakash Singapore, SG 5 13
Rutkowski, Joseph Dale Chandler, US 14 12
Sawant, Milind San Jose, US 4 78
Zazzera, Joshua Phoenix, US 6 24

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