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公开(公告)号：US10054622B2
公开(公告)日：2018-08-21
申请号：US14601785
申请日：2015-01-21
Applicant: Texas Instruments Incorporated
Inventor： David Hernandez , Mandy Barsilai
CPC classification number: G01R27/02 , G01R31/2829 , G01R31/343
Abstract: A method, apparatus and a system for a Linear Resonant Actuator (LRA) real time impedance tracking. The method includes extracting the Back Electro-Motive Force (BEMF) voltage from a driver's load current by determining a current multiplying factor utilizing a Least Mean Square (LMS) algorithm and introducing an error function to control the gain of the load current and isolate the BEMF.
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公开(公告)号：US09800191B2
公开(公告)日：2017-10-24
申请号：US14502493
申请日：2014-09-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Mandy Barsilai , David Hernandez
IPC: H01L41/09 , H01L31/042 , H02P25/02 , H02P25/06 , H02P25/032 , H02P6/182
CPC classification number: H02P25/032 , H02P6/182 , H02P25/06
Abstract: A system includes a controller to control movement of a linear resonant actuator (LRA). The system includes a monitor in the controller to monitor a back electromotive force (BEMF) signal from the LRA representing the movement of the LRA. The monitor generates an indicator that indicates whether or not movement of the LRA has occurred. A primary loop module in the controller controls acceleration and braking of the LRA based on the monitored BEMF signal if the indicator from the monitor indicates that LRA movement has occurred. An alternate cycle module in the controller pushes the LRA at a predetermined frequency if the indicator from the monitor indicates that LRA movement has not occurred. The push is employed to move the LRA when the BEMF signal is undetectable by the monitor with respect to a predetermined threshold.
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13.发明申请公开(公告)号：US20170301196A1
公开(公告)日：2017-10-19
申请号：US15638975
申请日：2017-06-30
Applicant: Texas Instruments Incorporated
Inventor： Mandy Barsilai , David Hernandez , Mark Stephen Toth
Abstract: Disclosed examples include methods and circuits to drive a haptic actuator, in which a single input signal from a host device has a first state representing a command to drive the actuator and a second state representing a command to stop the actuator. A control circuit provides a drive control signal to a driver circuit to drive the haptic actuator in response to the control signal transitioning to the first state, and to stop the haptic actuator in response to the control signal transitioning to the second state. A timer circuit places the circuit in a low power mode a predetermined time after the control signal transitions to the second state, or the control circuit places the circuit in the low power mode in response to a feedback signal indicating that the actuator has reached a stopped condition.
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公开(公告)号：US09274602B2
公开(公告)日：2016-03-01
申请号：US13663907
申请日：2012-10-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Mayank Garg , David Hernandez , Brandon Beckham
CPC classification number: G06F3/016
Abstract: An apparatus and method for controlling a haptic actuator. A haptic actuator controller can includes driver input amplifier, an actuator feedback amplifier, an actuator driver, and a gain controller. The actuator driver is configured to drive a haptic actuator based on a difference of output of the input amplifier and output of the actuator feedback amplifier. The gain controller is configured to determine a boost interval for initiating motion of the haptic actuator, the boost interval based on a boost threshold back-electromotive-force (BEMF) voltage value exceeding a BEMF voltage generated by the haptic actuator. The gain controller is also configured to apply boost gains in the input amplifier and the feedback amplifier during the boost interval. The boost gains are higher than gains applied subsequent to the boost interval to maintain motion of the haptic actuator.
Abstract translation: 一种用于控制触觉致动器的装置和方法。 触觉致动器控制器可以包括驱动器输入放大器，致动器反馈放大器，致动器驱动器和增益控制器。 致动器驱动器被配置为基于输入放大器的输出和致动器反馈放大器的输出的差来驱动触觉致动器。 增益控制器被配置为基于超过由触觉致动器产生的BEMF电压的升压阈值反电动势（BEMF）电压值来确定用于启动触觉致动器的运动的升压间隔。 增益控制器还被配置为在升压间隔期间在输入放大器和反馈放大器中施加升压增益。 升压增益高于在升压间隔之后施加的增益以维持触觉致动器的运动。
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公开(公告)号：US20150137713A1
公开(公告)日：2015-05-21
申请号：US14502493
申请日：2014-09-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： MANDY BARSILAI , David Hernandez
IPC: H02P25/02
CPC classification number: H02P25/032 , H02P6/182 , H02P25/06
Abstract: A system includes a controller to control movement of a linear resonant actuator (LRA). The system includes a monitor in the controller to monitor a back electromotive force (BEMF) signal from the LRA representing the movement of the LRA. The monitor generates an indicator that indicates whether or not movement of the LRA has occurred. A primary loop module in the controller controls acceleration and braking of the LRA based on the monitored BEMF signal if the indicator from the monitor indicates that LRA movement has occurred. An alternate cycle module in the controller pushes the LRA at a predetermined frequency if the indicator from the monitor indicates that LRA movement has not occurred. The push is employed to move the LRA when the BEMF signal is undetectable by the monitor with respect to a predetermined threshold.
Abstract translation: 系统包括控制线性谐振致动器（LRA）的运动的控制器。 该系统包括控制器中的监视器，用于监视来自表示LRA的运动的LRA的反电动势（BEMF）信号。 监视器生成一个指示器，指示是否发生了LRA的移动。 控制器中的主回路模块根据监控的BEMF信号控制LRA的加速和制动，如果来自监视器的指示器指示发生了LRA运动。 如果来自监视器的指示器指示没有发生LRA运动，则控制器中的替代循环模块以预定频率推动LRA。 当监视器相对于预定阈值检测不到BEMF信号时，采用推动来移动LRA。
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Patent Agency Ranking
公开(公告)号：US20140118126A1
公开(公告)日：2014-05-01
申请号：US13663907
申请日：2012-10-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Mayank Garg , David Hernandez , Brandon Beckham
IPC: G08B6/00
CPC classification number: G06F3/016
Abstract: An apparatus and method for controlling a haptic actuator. A haptic actuator controller can includes driver input amplifier, an actuator feedback amplifier, an actuator driver, and a gain controller. The actuator driver is configured to drive a haptic actuator based on a difference of output of the input amplifier and output of the actuator feedback amplifier. The gain controller is configured to determine a boost interval for initiating motion of the haptic actuator, the boost interval based on a boost threshold back-electromotive-force (BEMF) voltage value exceeding a BEMF voltage generated by the haptic actuator. The gain controller is also configured to apply boost gains in the input amplifier and the feedback amplifier during the boost interval. The boost gains are higher than gains applied subsequent to the boost interval to maintain motion of the haptic actuator.
Abstract translation: 一种用于控制触觉致动器的装置和方法。 触觉致动器控制器可以包括驱动器输入放大器，致动器反馈放大器，致动器驱动器和增益控制器。 致动器驱动器被配置为基于输入放大器的输出和致动器反馈放大器的输出的差来驱动触觉致动器。 增益控制器被配置为基于超过由触觉致动器产生的BEMF电压的升压阈值反电动势（BEMF）电压值来确定用于启动触觉致动器的运动的升压间隔。 增益控制器还被配置为在升压间隔期间在输入放大器和反馈放大器中施加升压增益。 升压增益高于在升压间隔之后施加的增益以维持触觉致动器的运动。
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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：US20210409885A1
公开(公告)日：2021-12-30
申请号：US17319061
申请日：2021-05-12
Applicant: Texas Instruments Incorporated
Inventor： David Hernandez , Amit Goyal
Abstract: A system for determining the temperature of a voice coil of a speaker includes a first pre-emphasis filter which has an input coupled to receive a digitized current sense signal. The first pre-emphasis filter applies a gain to signal components at a selected frequency band and provides a pre-emphasized current sense signal. The system includes a second pre-emphasis filter which has an input coupled to receive a digitized voltage sense signal. The second pre-emphasis filter applies a gain to the signal components at the selected frequency band and provides a pre-emphasized voltage sense signal. The system includes a first quantizer module configured to map the pre-emphasized signal to a quantized current sense signal, and includes a second quantizer module configured to map the pre-emphasized voltage sense signal to a quantized voltage sense signal.
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公开(公告)号：US20210135616A1
公开(公告)日：2021-05-06
申请号：US16906364
申请日：2020-06-19
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： David Hernandez , Supriyo Palit
IPC: H02P25/034 , H02P23/00 , G05B19/4155
Abstract: Disclosed embodiments include an apparatus for closed loop control of a linear resonant actuator comprising a motor drive circuit configured to provide a motor drive signal, a current and voltage sensing circuit coupled to the output terminal of the motor drive circuit and across the motor, and having current sense and a voltage sense outputs. A resonant frequency and back emf extraction circuit receives the current sense and voltage sense outputs, and outputs a resonant frequency signal output and a measured back emf signal output. An actuator model circuit has inputs coupled to the output of the motor drive circuit, the resonant frequency signal output, and a mechanical system quality factor signal generated by an adaptation circuit having an input coupled to the error summing circuit output. The error summing circuit has inputs coupled to the output of the actuator model and the measured back emf signal.
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公开(公告)号：US10609477B1
公开(公告)日：2020-03-31
申请号：US16443897
申请日：2019-06-18
Applicant: Texas Instruments Incorporated
Inventor： Jasjot Singh Chadha , David Hernandez , Mukund Navada Kanyana , Rejin Kanjavalappil Raveendranath , Sahiti Priya C
Abstract: A boosted audio amplifier system includes a first digital interpolation filter configured to oversample an audio input signal at a first oversampling rate and includes a signal level detector having an input coupled to receive the oversampled audio input signal and configured to produce an audio input level signal. The system further includes a programmable delay buffer having inputs coupled to receive the oversampled audio input signal and a first delay signal. The programmable delay buffer adds a first delay to the oversampled audio input signal to produce a delayed input signal. The system also includes a first processor having inputs coupled to receive a battery voltage level signal, the audio input level signal and the first delay signal. The first processor is configured to produce boost control signals to regulate a boost voltage.
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