Invention Grant
US09054627B2 Method and apparatus to drive a linear resonant actuator at its resonant frequency
有权
在其谐振频率下驱动线性谐振致动器的方法和装置
- Patent Title: Method and apparatus to drive a linear resonant actuator at its resonant frequency
- Patent Title (中): 在其谐振频率下驱动线性谐振致动器的方法和装置
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Application No.: US13443741Application Date: 2012-04-10
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Publication No.: US09054627B2Publication Date: 2015-06-09
- Inventor: Mayank Garg , David Hernandez-Garduno , Brandon J. Beckham , David J. Baldwin , Brett E. Forejt
- Applicant: Mayank Garg , David Hernandez-Garduno , Brandon J. Beckham , David J. Baldwin , Brett E. Forejt
- Applicant Address: US TX Dallas
- Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee Address: US TX Dallas
- Agent Alan A. R. Cooper; Frank D. Cimino
- Main IPC: H02K33/00
- IPC: H02K33/00 ; H02P25/02 ; H02P21/00 ; H02K33/16
Abstract:
A method for driving a Linear Resonant Actuator (LRA) is provided. During a first off interval, the back-emf of the LRA is measured. During a first off interval, a timer is started when the back-emf reaches a predetermined threshold, and after a predetermined delay has lapsed following the back-emf reaching the predetermined threshold during the first off interval, the LRA is driven over a drive interval having a length and drive strength. A second off interval is entered following the drive interval, and during the second off interval, the back-emf of the LRA is measured. During the second off interval, the timer is stopped when the back-emf reaches the predetermined threshold. The value from the timer that corresponds to the duration between the back-emf reaching the predetermined threshold during the first off interval and the back-emf reaching the predetermined threshold during the second off interval determines the length.
Public/Granted literature
- US20130264973A1 METHOD AND APPARATUS TO DRIVE A LINEAR RESONANT ACTUATOR AT ITS RESONANT FREQUENCY Public/Granted day:2013-10-10
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