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公开(公告)号：US20250058641A1
公开(公告)日：2025-02-20
申请号：US18937212
申请日：2024-11-05
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 a 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：US11705834B2
公开(公告)日：2023-07-18
申请号：US16728664
申请日：2019-12-27
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajan Lakshmi Narasimha , David Patrick Magee
CPC classification number: H02P6/157 , H02P6/20 , H02P2209/03 , H02P2209/07
Abstract: Systems and methods for sensorless trapezoidal control of brushless DC motors provide effective high-torque startup and low speed operation without the use of Hall effect sensors or encoders during motor operation. The systems and methods also provide the ability to boost signal-to-noise ratio for motor startup and low speed operation via an augmenting supply voltage. Sampling architectures and current-dependent inductance modeling architectures for the control systems are also described.
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公开(公告)号：US20230204679A1
公开(公告)日：2023-06-29
申请号：US18182306
申请日：2023-03-10
Applicant: Texas Instruments Incorporated
IPC: G01R31/389 , G01R31/367 , G01R31/396 , G01R31/3842
CPC classification number: G01R31/389 , G01R31/367 , G01R31/396 , G01R31/3842
Abstract: From a current measurement circuit, digital samples are received of a current signal that flows through a battery cell within a measurement period. From a voltage measurement circuit, digital samples are received of a voltage signal across the battery cell within the measurement period. First voltage spectral components are generated based on performing a first transform operation on the digital samples of the voltage signal. A current spectrum is generated based on performing a second transform operation on the digital samples of the current signal. Second voltage spectral components are generated based on a first condition of the battery cell before the measurement period and a second condition of the battery cell after the measurement period. A voltage spectrum is including the first voltage spectrum and the second voltage spectrum is generated. An impedance spectrum of the battery cell is generated based on the voltage spectrum and the current spectrum.
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公开(公告)号：US11366076B2
公开(公告)日：2022-06-21
申请号：US16883165
申请日：2020-05-26
Applicant: Texas Instruments Incorporated
Inventor： David Patrick Magee , Stephen John Fedigan
Abstract: In described examples, one or more devices include: apparatus including a lens element and a transducer to vibrate the lens element at an operating frequency when operating in an activated state; and controller circuitry. The controller circuitry is arranged to measure an impedance of the apparatus, to determine an estimated temperature of the apparatus in response to the measured impedance, to compare the estimated temperature against a temperature threshold for delineating an operating temperature range of the apparatus, and to toggle an activation state of the transducer in response to comparing the estimated temperature against the temperature threshold.
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公开(公告)号：US11300781B2
公开(公告)日：2022-04-12
申请号：US16781506
申请日：2020-02-04
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Stephen John Fedigan , David Patrick Magee
Abstract: An apparatus for mitigating contamination of an optical device comprises an open-topped, closed-sided, and closed-bottomed housing cup partially defining a protected volume to enclose the optical device. A housing cap encloses a top of the housing cup and partially defines the protected volume. The housing cap includes a top collar having an open central aperture. A top cover laterally spans the central aperture of the top collar. An interface structure circumscribes the top cover to suspend the top cover downwardly into the housing cup from the top collar. The interface structure prevents direct contact between the top cover and the top collar.
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Patent Agency Ranking
公开(公告)号：US20220021379A1
公开(公告)日：2022-01-20
申请号：US17364489
申请日：2021-06-30
Applicant: Texas Instruments Incorporated
Inventor： David Hernandez , David Patrick Magee , Mohit Chawla , James Kelly Griffin
IPC: H03K7/08
Abstract: Techniques are provided herein for generating PWM signals. Furthermore, a direct-drive method is disclosed in which a PWM signal is generated as a differential signal made up of OUTP and OUTN signals, where OUTP is a copy of OUTN but shifted in time by half a period. The PWM signal is generated by passing each of an input period and an input duty cycle through corresponding sigma-delta circuits to generate a refined period and a refined duty cycle, respectively. In some example cases, a threshold mapper uses a lookup table (LUT) or similar mechanism to select timing thresholds for rise times and fall times for each of the OUTP and OUTN signals, where the timing thresholds are selected based on the refined period and the refined duty cycle. In some example cases, a pulse generator generates the OUTP and OUTN signals based on the timing thresholds.
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公开(公告)号：US11129538B2
公开(公告)日：2021-09-28
申请号：US16442845
申请日：2019-06-17
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Tarkesh Pande , David Patrick Magee , Rajan Narasimha
Abstract: Disclosed examples include heart rate monitor systems and methods to estimate a patient heart rate or rate of another pulsed signal, in which rate hypotheses or states, are identified for a current time window according to digital sample values of the pulsed signal for a current sample time window, and a rate change value is computed for potential rate transitions between states of the current and previous time windows. Transition pair branch metric values are computed as a function of the rate change value and a frequency domain amplitude of the corresponding rate hypothesis for the current time window, and the pulsed signal rate estimate is determined according to a maximum path metric computed according to the branch metric value and a corresponding path metric value for the previous time window.
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公开(公告)号：US10830619B2
公开(公告)日：2020-11-10
申请号：US14866779
申请日：2015-09-25
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Amardeep Sathyanarayana , Anand G. Dabak , David Patrick Magee
IPC: G01F1/66
Abstract: In an embodiment, a system for measuring material flow in a pipe is disclosed. A first transducer is operable to transmit a first signal having a first frequency at a first time and receive a second signal at a second time, and a second transducer spaced apart from the first transducer and is operable to receive the first signal and transmit the second signal having the first frequency. A signal processing circuit communicatively coupled to the first transducer and the second transducer, the signal processing circuit is operable to determine a first envelope of the first signal and a second envelope of the second signal and calculate a flow rate based on the first envelope of the first signal and the second envelope of the second signal.
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公开(公告)号：US10780467B2
公开(公告)日：2020-09-22
申请号：US15492433
申请日：2017-04-20
Applicant: Texas Instruments Incorporated
Abstract: Methods and apparatus for surface wetting control are disclosed. In certain described examples, an apparatus can expel fluid from a droplet on a surface using a transducer mechanically coupled to the surface. A first area of the surface can have a first wettability for the fluid, and a second area of the surface can have a second wettability for the fluid. The first wettability of the first area of the surface can be greater than the second wettability of the second area of the surface. The first area and the second area can be arranged in a patterned arrangement.
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公开(公告)号：US20200282436A1
公开(公告)日：2020-09-10
申请号：US16827344
申请日：2020-03-23
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Stephen John Fedigan , David Patrick Magee
Abstract: A signal generator has a generator output. The signal generator is configured to generate first and second signals at the generator output. The first signal has a first frequency, and the second signal has a second frequency. Switching circuitry has a circuitry input and a circuitry output. The circuitry input is coupled to the generator output. The circuitry output is adapted to be coupled to an ultrasonic transducer mechanically coupled with a surface. The switching circuitry is configured to: provide the first signal to the ultrasonic transducer at the first frequency to reduce a fluid droplet on the surface from a first size to a second size; and provide the second signal to the ultrasonic transducer at the second frequency to reduce the fluid droplet from the second size to a third size.
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