Invention Grant
- Patent Title: Voice coil motor pulse width modulation-to-linear smooth transition control
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Application No.: US15331213Application Date: 2016-10-21
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Publication No.: US10547267B2Publication Date: 2020-01-28
- Inventor: Qunying Li , Joao Carlos Felicio Brito , Wenxiao Tan
- Applicant: Texas Instruments Incorporated
- Applicant Address: US TX Dallas
- Assignee: Texas Instruments Incorporated
- Current Assignee: Texas Instruments Incorporated
- Current Assignee Address: US TX Dallas
- Agent Lawrence J. Bassuk; Charles A. Brill; Frank D. Cimino
- Main IPC: H02P7/00
- IPC: H02P7/00 ; H02P25/034 ; H02P7/03

Abstract:
Methods and apparatus providing a smooth transition from a pulse width modulation mode to a linear mode to drive a voice coil motor are disclosed. An example apparatus includes an H-bridge; a pulse generator to generate a pulse when the voice coil motor driver transitions from pulse width modulation mode to linear mode; a first boost circuit to, when the pulse is generated, increase a first current being applied to a first gate of a first transistor in the H-bridge, the increase in the first current enabling the first transistor; and a second boost circuit to, when the pulse is generated, provide an additional path to ground from a node coupled to a second gate of a second transistor of the H bridge, the path to ground corresponding to a voltage drop that disables the second transistor.
Public/Granted literature
- US20180115268A1 VOICE COIL MOTOR PULSE WIDTH MODULATION-TO-LINEAR SMOOTH TRANSITION CONTROL Public/Granted day:2018-04-26
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