公开(公告)号：US20180117642A1

公开(公告)日：2018-05-03

申请号：US15497624

申请日：2017-04-26

Applicant: Texas Instruments Incorporated

Inventor： David Patrick Magee ,  Stephen John Fedigan

IPC: B08B7/02 ,  G02B27/00 ,  B60S1/56 ,  B06B1/02 ,  H01L41/04

Abstract: Lens cleaning systems, drivers and methods to detect faults or degradation in a lens cleaning system, including a controller to control a lens transducer drive signal frequency to vibrate the lens in a frequency range of interest and measure frequency response values according to driver feedback signals, and to compare the measured frequency response values to baseline frequency response values for a healthy system, and to selectively determine the existence of a fault or degradation in the lens cleaning system according to dissimilarities between the measured frequency response values and the baseline frequency response values.

公开(公告)号：US20180085784A1

公开(公告)日：2018-03-29

申请号：US15492315

申请日：2017-04-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Stephen John Fedigan ,  David Patrick Magee

IPC: B06B1/02 ,  B06B1/06 ,  G02B27/00 ,  F26B5/02

CPC classification number: B08B7/028 ,  B06B1/023 ,  B06B1/0284 ,  B06B1/06 ,  B60S1/02 ,  B60S1/56 ,  F26B5/02 ,  G02B27/0006

Abstract: Methods and apparatus for ultrasonic lens cleaner using configurable filter banks are disclosed. In certain described examples, the methods and apparatus can expel fluid from a droplet on an optical surface using an ultrasonic transducer mechanically coupled to the optical surface and having first and second resonant frequency bands.

公开(公告)号：US11693235B2

公开(公告)日：2023-07-04

申请号：US17165895

申请日：2021-02-02

Applicant: Texas Instruments Incorporated

Inventor： Daniel Lee Revier ,  Benjamin Stassen Cook ,  David Patrick Magee ,  Stephen John Fedigan

IPC: G02B27/00 ,  G01H13/00 ,  B08B7/02 ,  G01D5/24

CPC classification number: G02B27/0006 ,  B08B7/028 ,  G01H13/00 ,  G01D5/2405

Abstract: An apparatus includes a mass detection circuit coupled to a surface covered with a plurality of electrodes. The mass detection circuit is configured to detect a mass of a first droplet present on the surface. The apparatus further includes a transducer circuit coupled to a transducer, which is coupled to the surface and form a lens unit. The transducer circuit configured to excite a first vibration of the surface at a resonant frequency to form a high displacement region on the surface. The apparatus also includes a voltage excitation circuit coupled to the plurality of electrodes. In response to the detection of the mass of the first droplet, the voltage excitation circuit is configured to apply a sequence of differential voltages on one or more consecutive electrodes which moves the first droplet to the high displacement region.

公开(公告)号：US11607704B2

公开(公告)日：2023-03-21

申请号：US15492395

申请日：2017-04-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Benjamin Stassen Cook ,  Daniel Lee Revier ,  Stephen John Fedigan ,  David Patrick Magee

IPC: B05B17/06 ,  B05B5/08 ,  G02B1/18 ,  G02B27/00

Abstract: Methods and apparatus for electrostatic control of expelled material for lens cleaners are disclosed. In certain described examples, an apparatus can expel fluid by atomization from a central area of the surface using an ultrasonic transducer mechanically coupled to the surface. A first electrode can be arranged relative to the central area of the surface. A second electrode can be located in a peripheral area relative to the central area of the surface, in which a voltage can be applied between the first and second electrodes to attract atomized fluid at the peripheral area.

公开(公告)号：US11420238B2

公开(公告)日：2022-08-23

申请号：US15907125

申请日：2018-02-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： David Patrick Magee ,  Stephen John Fedigan

IPC: B08B7/02 ,  B08B7/00 ,  B60S1/56 ,  G02B27/00 ,  B08B7/04

Abstract: In described examples, a transducer vibrates a lens element in a heating mode and a cleaning mode. Controller circuitry activates the transducer in the heating mode in response to an estimated temperature, and activates the transducer in the cleaning mode after the transducer is activated in the heating mode.

公开(公告)号：US11237387B2

公开(公告)日：2022-02-01

申请号：US15583057

申请日：2017-05-01

Applicant: Texas Instruments Incorporated

Inventor： David Patrick Magee ,  Stephen John Fedigan

IPC: H01L41/107 ,  H01L41/09 ,  G02B27/00 ,  G02B13/16 ,  G02B13/06

Abstract: Disclosed examples include lens cleaning systems, drivers and operating methods, including a transducer mechanically coupled to a lens, a driver to provide an oscillating drive signal to the transducer and a controller to control the drive signal frequency to vibrate the lens at frequencies in a range of interest. The controller determines a measured resonant frequency of the lens cleaning system in the range of interest according to a transducer feedback signal and selectively performs a lens cleaning operation if the measured resonant frequency differs from a baseline resonant frequency of the lens cleaning system for a clean lens.

公开(公告)号：US10695805B2

公开(公告)日：2020-06-30

申请号：US15605463

申请日：2017-05-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： David Patrick Magee ,  Stephen John Fedigan

IPC: H01L41/09 ,  B08B7/02 ,  G01N29/036 ,  H01L41/04 ,  G01N29/02 ,  B60S1/56 ,  G01K13/00 ,  G01N29/34 ,  G01R31/34

Abstract: A control system for cleaning and monitoring a sensor assembly disposed externally on a vehicle is provided and includes a contaminant detection/identification sub-system that measures a resonant frequency of the sensor assembly to detect contaminants disposed on an exposed surface of the sensor assembly. A cleaning sub-system is provided and includes cleaning modes that expel the contaminants from the exposed surface of the sensor assembly. A temperature monitoring device monitors a temperature of an actuator disposed in the sensor assembly and a fault detection device detects faults in the sensor assembly.

公开(公告)号：US10606069B2

公开(公告)日：2020-03-31

申请号：US15225212

申请日：2016-08-01

Applicant: Texas Instruments Incorporated

Inventor： Stephen John Fedigan ,  David Patrick Magee ,  Yunhong Li

IPC: G02B27/00 ,  G02B3/00 ,  B08B7/02

Abstract: A lens structure system. The system comprises a lens structure and a multi-segmented transducer coupled to the lens structure. The multi-segmented transducer comprises a plurality of segments. For each segment in the plurality of segments, there also is a first conductor and a second conductor electrically coupled to the segment.

公开(公告)号：US10384239B2

公开(公告)日：2019-08-20

申请号：US15492315

申请日：2017-04-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Stephen John Fedigan ,  David Patrick Magee

IPC: F26B5/02 ,  B08B7/02 ,  B60S1/56 ,  B06B1/06 ,  B06B1/02 ,  G02B27/00 ,  B60S1/02

Abstract: Methods and apparatus for ultrasonic lens cleaner using configurable filter banks are disclosed. In certain described examples, the methods and apparatus can expel fluid from a droplet on an optical surface using an ultrasonic transducer mechanically coupled to the optical surface and having first and second resonant frequency bands.

公开(公告)号：US10145897B2

公开(公告)日：2018-12-04

申请号：US14755069

申请日：2015-06-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Stephen John Fedigan

IPC: G01R31/34

Abstract: Motor winding fault detection circuits and methods to detect motor winding faults are disclosed. An example fault detection circuit includes a positive sequence voltage calculator to calculate a positive sequence voltage value for a three-phase motor; a positive sequence current calculator to calculate a positive sequence current value for the three-phase motor; an interpolator to calculate an expected negative sequence voltage value based on the positive sequence voltage value, the positive sequence current value, and measured characteristics of the three-phase motor; a negative sequence voltage calculator to calculate a measured negative sequence voltage value for the three-phase motor; and a fault detector to detect that a winding fault exists in the three-phase motor when a difference between the expected negative sequence voltage value and the measured negative sequence voltage value satisfies a threshold.