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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
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.
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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.
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公开(公告)号：US11040625B2
公开(公告)日：2021-06-22
申请号：US14938602
申请日：2015-11-11
Applicant: Texas Instruments Incorporated
Inventor： Aravind Samba Murthy , David Patrick Magee
Abstract: A regenerative braking controller for an AC motor. To determine an electromagnetic torque for slowing or stopping the motor, the regenerative braking controller accesses a lookup table to retrieve an braking torque value corresponding to a current estimate of rotor velocity. The retrieved braking torque may correspond to a maximum or minimum torque level at which regenerative braking will occur at the current rotor velocity, or to a torque level at which charging current during regenerative braking will be maximized. If an external mechanical brake is present, the regenerative braking controller can forward an external braking torque signal to a controller so that the mechanical brake can apply the remainder of the braking force beyond that indicated by the regenerative braking torque. A method for establishing the braking torques to be stored in the lookup table is also disclosed.
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公开(公告)号：US20200336093A1
公开(公告)日：2020-10-22
申请号：US16865600
申请日：2020-05-04
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： David L. Wilson , Jorge Zambada Tinoco , David Patrick Magee
Abstract: An adaptive torque disturbance cancellation method and motor control system for rotating a load are described. The system has: (i) a speed controller for receiving a first input signal indicating a desired motor speed and, in response, for outputting a motor control signal; (ii) current sensing circuitry for sensing current through a motor that rotates in response to the speed controller; (iii) circuitry for storing, into a storage device, history data representative of the current through a motor when the motor operates to rotate the load; and (iv) circuitry for modifying the motor control signal in response to the history data.
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公开(公告)号：US10797629B2
公开(公告)日：2020-10-06
申请号：US16198964
申请日：2018-11-23
Applicant: Texas Instruments Incorporated
Inventor： Rajan Lakshmi Narasimha , David Patrick Magee
Abstract: A permanent magnet motor controller injects a periodic signal into a field oriented controller of the brushless motor. Phase currents in stator windings of the brushless motor are measured. A d-axis current and a q-axis current are determined with a transform of the phase currents. The d-axis current and the q-axis current are demodulated to extract an angle dependent current signature that includes a sine component of a rotor angle estimate and a cosine component of the rotor angle estimate. The rotor angle estimate is determined by processing the sine component and cosine component.
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Patent Agency Ranking
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.
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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
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.
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公开(公告)号：US10444203B2
公开(公告)日：2019-10-15
申请号：US15374802
申请日：2016-12-09
Applicant: Texas Instruments Incorporated
Abstract: Mechanical vibration may be sensed by a remotely located ultrasonic sensor. An ultrasonic wave may be transmitted from a transmitter to a vibrating surface, in which the transmitter is separated from the vibrating surface by a distance. A reflected portion of the ultrasonic wave that is reflected from the vibrating surface may be received by a receiver that is also separated from the vibrating surface by a distance. A measure of phase shift amplitude in the reflected portion of the ultrasonic wave may be determined and converted into an amplitude of a vibration of the vibrating surface.
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公开(公告)号：US10389285B2
公开(公告)日：2019-08-20
申请号：US15804825
申请日：2017-11-06
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： David Patrick Magee , Andre Veltman , Jorge Zambada
Abstract: A method of controlling an electric motor (motor) includes providing a processor having an associated memory storing a stator resistance (Rs) estimation (RSE) algorithm that is programmed to implement the RSE algorithm to execute steps including injecting a current waveform at an arbitrary frame of reference into the stator using a field-oriented-control (FOC) motor controller including an Id controller and an Iq controller, and measuring current and voltage values from the motor responsive to the injecting. The measured current and voltage values are then transformed into transformed current and voltage values in a d/q coordinate system. The transformed current and voltage values are low pass filtered to generate filtered d/q current and voltage values, and a value for Rs is estimated from the filtered d/q current and voltage values. The arbitrary frame of reference can be a time-varying frame of reference.
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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
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.
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