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公开(公告)号：US10321831B2
公开(公告)日：2019-06-18
申请号：US15237941
申请日：2016-08-16
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：US20190167129A1
公开(公告)日：2019-06-06
申请号：US16271246
申请日：2019-02-08
Applicant: Texas Instruments Incorporated
Inventor： Tarkesh Pande , David Patrick Magee
Abstract: A method for heart rate measurement in a photoplethysmograph (PPG) heart rate monitor device is provided that includes performing motion compensation on a PPG signal wherein a motion compensated PPG signal PPGaccX is generated with reference to an X-axis acceleration signal, a motion compensated PPG signal PPGaccY is generated with reference to a Y-axis acceleration signal, and a motion compensated PPG signal PPGaccZ is generated with reference to a Z-axis acceleration signal, combining PPGaccX, PPGaccY, and PPGaccZ to generate a final motion compensated PPG signal, wherein a first weight is applied PPGaccX, a second weight is applied to PPGaccY, and a third weight is applied to PPGaccZ, performing a single Fourier Transform (FT) on the final motion compensated PPG signal to generate a frequency domain PPG signal; and estimating a heart rate based on the frequency domain PPG signal.
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63.发明申请公开(公告)号：US20180304282A1
公开(公告)日：2018-10-25
申请号：US15492395
申请日：2017-04-20
Applicant: TEXAS INSTRUMENTS INCORPORATED
CPC classification number: B05B5/002 , B05B17/0661 , B05B17/0669 , B60S1/56
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.
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公开(公告)号：US20180198397A1
公开(公告)日：2018-07-12
申请号：US15916945
申请日：2018-03-09
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Eric James Thomas , David Patrick Magee
Abstract: A method of determining angular position (0) of a rotor of an N-phase permanent magnet motor (PMM). A processor having an associated stored angular position determination (APD) algorithm is programmed to implement the algorithm to cause an associated motor controller to execute steps including forcing one vector at a time a phase vector set of current or voltage vectors to stator terminals of windings for the N-phases a positive and negative magnitude vector, wherein the vector magnitude is sufficiently small to not move the rotor, and a time duration for the forcing current or voltage vectors is essentially constant. The resulting stator current or voltage levels are measured for each current or voltage vector. An N-dimension current vector or voltage vector is generated from superposition of the resulting stator current levels or resulting stator voltage levels. The N-dimension current vector or voltage vector is used to determine angular position.
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公开(公告)号：US20180076749A1
公开(公告)日：2018-03-15
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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Patent Agency Ranking
公开(公告)号：US09917542B2
公开(公告)日：2018-03-13
申请号：US15250306
申请日：2016-08-29
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Eric James Thomas , David Patrick Magee
Abstract: A method of determining angular position (θ) of a rotor of an N-phase permanent magnet motor (PMM). A processor having an associated stored angular position determination (APD) algorithm is programmed to implement the algorithm to cause an associated motor controller to execute steps including forcing one vector at a time a phase vector set of current or voltage vectors to stator terminals of windings for the N-phases a positive and negative magnitude vector, wherein the vector magnitude is sufficiently small to not move the rotor, and a time duration for the forcing current or voltage vectors is essentially constant. The resulting stator current or voltage levels are measured for each current or voltage vector. An N-dimension current vector or voltage vector is generated from superposition of the resulting stator current levels or resulting stator voltage levels. The N-dimension current vector or voltage vector is used to determine angular position.
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公开(公告)号：US20170272012A1
公开(公告)日：2017-09-21
申请号：US15615074
申请日：2017-06-06
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： David Patrick Magee , Eric James Thomas
IPC: H02P6/182
CPC classification number: H02P6/182
Abstract: A method of determining the angular position (θ) of a rotor of an N-phase permanent magnet motor (PMM) includes providing a processor having an associated memory, wherein the memory stores an angular position determination (APD) equation or hardware is included implementing the APD equation. The APD equation determines the angular position from N-phase measurements obtained from the stator windings associated with each of the N-phases. A voltage or a current is forced upon the stator terminals of the stator windings for each of the N-phases, a resulting stator current or stator voltage is sensed to provide the N-phase measurements responsive to the forcing of the voltage or current, and the APD equation is used to determine the angular position from the N-phase measurements.
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公开(公告)号：US09692336B2
公开(公告)日：2017-06-27
申请号：US14880008
申请日：2015-10-09
Applicant: Texas Instruments Incorporated
Inventor： David Patrick Magee , Jorge Zambada
CPC classification number: H02P21/0003 , H02P21/14 , H02P21/18 , H02P21/24
Abstract: A motor controller architecture and method of operating the same. The motor controller asynchronously generates multiphase control signals for a multi-phase electric motor, relative to the estimation of various state parameters used in generating those control signals. Latency between the state estimation task and the control signal generation task is addressed by storing a timestamp with each input data sample from the sensors, and maintaining that timestamp with the output data from state estimation. Knowledge of the timestamp value allows the control task to update the state estimates to compensate for the time difference between the input data sample and the current sampling period.
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公开(公告)号：US20170129340A1
公开(公告)日：2017-05-11
申请号：US14938602
申请日：2015-11-11
Applicant: Texas Instruments Incorporated
Inventor： Aravind Samba Murthy , David Patrick Magee
CPC classification number: B60L7/14 , B60L7/18 , B60L15/025 , B60L15/2009 , B60L2240/421 , B60L2240/423 , B60L2240/427 , B60L2240/429 , H02P3/16 , H02P21/22 , H02P21/36 , H02P27/08 , Y02T10/643 , Y02T10/646 , Y02T10/72 , Y02T10/7275
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：US20170025979A1
公开(公告)日：2017-01-26
申请号：US15217745
申请日：2016-07-22
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.
Abstract translation: 描述了用于旋转负载的自适应扭矩干扰消除方法和电动机控制系统。 该系统具有：（i）速度控制器，用于接收指示期望的电动机速度的第一输入信号，并且作为响应，用于输出电动机控制信号; （ii）电流感测电路，用于感测电流响应于速度控制器旋转的电动机; （iii）电路，用于在电动机操作以使负载旋转时，将表示通过电动机的电流的历史数据存储到存储装置中; 以及（iv）用于响应历史数据修改电动机控制信号的电路。
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