US 12,242,671 B2
Braking control of haptic feedback device
Joseph Dale Rutkowski, Chandler, AZ (US); Joshua Zazzera, Chandler, AZ (US); Milind Sawant, Morgan Hill, CA (US); and Shivaprakash Halagur, Singapore (SG)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Appl. No. 18/003,132
Filed by QUALCOMM Incorporated, San Diego, CA (US)
PCT Filed Jan. 5, 2021, PCT No. PCT/US2021/070002
§ 371(c)(1), (2) Date Dec. 22, 2022,
PCT Pub. No. WO2022/047438, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 202021036917 (IN), filed on Aug. 27, 2020.
Prior Publication US 2023/0251715 A1, Aug. 10, 2023
Int. Cl. G06F 3/01 (2006.01); H02P 6/00 (2016.01)
CPC G06F 3/016 (2013.01) [H02P 6/006 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining, by a controller, a back electromotive force (BEMF) signal associated with a haptic feedback component,
wherein the BEMF signal is generated by movement of the haptic feedback component;
determining, by the controller, a time length for the BEMF signal to cross an amplitude-based window, the amplitude-based window being based on an amplitude of the BEMF signal being less than a threshold value, wherein determining the time length is based on:
a first measurement of a natural response of the haptic feedback component based on the BEMF signal, and
a second measurement of a forced response of the haptic feedback component when a braking signal is applied to the haptic feedback component after the BEMF signal to reduce an energy level of the haptic feedback component during a calibration process;
determining, by the controller and based on the time length, a braking amplitude for a control signal to reduce the energy level of the haptic feedback component; and
controlling, by the controller, the control signal according to the braking amplitude.