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公开(公告)号：US20170133966A1
公开(公告)日：2017-05-11
申请号：US14936374
申请日：2015-11-09
Applicant: QUALCOMM Incorporated
Inventor： Qadeer Khan , Sandeep Dhar
IPC: H02P25/032 , G01R19/165
CPC classification number: G01R19/16547 , H02P25/034
Abstract: The embodiments described herein relate to an improved system and algorithm for searching for a resonant frequency of a resonant actuator where the error between the drive frequency of the LRA and the resonant frequency of the LRA is large. In one embodiment, the drive frequency of a resonant actuator is set to an initial drive frequency, which is applied to the LRA. An induced voltage on the resonant actuator crosses can then be detected crossing a threshold voltage after the drive signal is turned off. If crossing the threshold voltage is not detected, the system is configured to sweep through a plurality of drive frequencies until the induced voltage on the resonant actuator is detected crossing the threshold voltage. This can be accomplished by repeatedly adjusting the drive frequency by a predefined incremental frequency ΔF and determining when the induced voltage on the LRA crosses the threshold voltage.
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公开(公告)号：US09755518B2
公开(公告)日：2017-09-05
申请号：US15179229
申请日：2016-06-10
Applicant: QUALCOMM Incorporated
Inventor： Mukesh Bansal , Michael McGowan , Iulian Mirea , Qadeer Khan , Troy Stockstad , Brett Walker , Todd Sutton
CPC classification number: H02M3/158 , G01R19/25 , H02M1/08 , H02M2001/0009
Abstract: Features and advantages of the present disclosure include a switching regulator and current measurement circuit. In one embodiment, a switching transistor in the switching regulator has a first voltage on a first terminal and a switching voltage on a second terminal. A current measurement circuit has first and second input terminals. A first switch couples the second terminal of the switching transistor to the first terminal of the current measurement circuit when the switching transistor is on, where the second input terminal of the current measurement circuit is coupled to the first terminal of the switching transistor and measurement(s) may be taken. When the switching transistor is off, the first and second input terminals of the current measurement circuit are coupled together, and measurements emulate zero current through the switching transistor.
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公开(公告)号：US20170229962A1
公开(公告)日：2017-08-10
申请号：US15179229
申请日：2016-06-10
Applicant: QUALCOMM Incorporated
Inventor： Mukesh Bansal , Michael McGowan , Iulian Mirea , Qadeer Khan , Troy Stockstad , Brett Walker , Todd Sutton
CPC classification number: H02M3/158 , G01R19/25 , H02M1/08 , H02M2001/0009
Abstract: Features and advantages of the present disclosure include a switching regulator and current measurement circuit. In one embodiment, a switching transistor in the switching regulator has a first voltage on a first terminal and a switching voltage on a second terminal. A current measurement circuit has first and second input terminals. A first switch couples the second terminal of the switching transistor to the first terminal of the current measurement circuit when the switching transistor is on, where the second input terminal of the current measurement circuit is coupled to the first terminal of the switching transistor and measurement(s) may be taken. When the switching transistor is off, the first and second input terminals of the current measurement circuit are coupled together, and measurements emulate zero current through the switching transistor.
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