公开(公告)号：US09344022B2

公开(公告)日：2016-05-17

申请号：US14024359

申请日：2013-09-11

Applicant: QUALCOMM Incorporated

Inventor： Qadeer A Khan ,  Sandeep Chaman Dhar ,  Joshua A Zazzera ,  Todd R Sutton

IPC: H02P1/00 ,  H02P6/18 ,  H02P6/14 ,  H02P25/02

CPC classification number: H02P6/182 ,  H02P6/153 ,  H02P25/032 ,  H02P29/032

Abstract: The present disclosure includes circuits and methods for driving resonant actuators. In one embodiment, a drive signal is applied to an actuator during a portion of a plurality of half cycles of a period of the drive signal. The actuator has a resonant frequency and may vibrate in response to the drive signal. An induced voltage is generated on terminals of the actuator in response to the vibration. A detection circuit may detect when the induced voltage on the actuator crosses a threshold after the drive signal is turned off. The drive signal may be triggered based on when the induced voltage crosses the threshold to align a frequency and phase of the drive signal with the resonant frequency and a phase of the actuator.

Abstract translation: 本公开包括用于驱动谐振致动器的电路和方法。 在一个实施例中，在驱动信号的周期的多个半周期的一部分期间，将驱动信号施加到致动器。 致动器具有谐振频率并且可以响应于驱动信号而振动。 响应于振动，在致动器的端子上产生感应电压。 检测电路可以在驱动信号关闭之后检测致动器上的感应电压何时超过阈值。 可以基于感应电压何时超过阈值来触发驱动信号，以将驱动信号的频率和相位与谐振频率和致动器的相位对准。