Invention Grant
- Patent Title: Drive control circuit for linear vibration motor
- Patent Title (中): 线性振动电机驱动控制电路
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Application No.: US13107320Application Date: 2011-05-13
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Publication No.: US08736201B2Publication Date: 2014-05-27
- Inventor: Tsutomu Murata
- Applicant: Tsutomu Murata
- Applicant Address: US AZ Phoenix
- Assignee: Semiconductor Components Industries, LLC
- Current Assignee: Semiconductor Components Industries, LLC
- Current Assignee Address: US AZ Phoenix
- Agent Rennie William Dover
- Priority: JP2010-111318 20100513
- Main IPC: H02K33/00
- IPC: H02K33/00

Abstract:
In a drive control circuit of a linear vibration motor, a drive signal generating unit generates a drive signal used to alternately deliver a positive current and a negative current to a coil. A driver unit generates a drive current in response to the drive signal generated by the drive signal generating unit and supplies the drive current to the coil. An induced voltage detector detects an induced voltage occurring in the coil. After a running of the linear vibration motor has terminated, the drive signal generating unit generates a drive signal whose phase is opposite to that of the drive signal generated during the motor running; this drive signal of opposite phase includes a high impedance period during which the driver unit is controlled to a high impedance state. The induced voltage detector detects the induced voltage occurring in the coil during the high impedance period.
Public/Granted literature
- US20110279068A1 DRIVE CONTROL CIRCUIT FOR LINEAR VIBRATION MOTOR Public/Granted day:2011-11-17
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