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公开(公告)号：US20170366123A1
公开(公告)日：2017-12-21
申请号：US15619128
申请日：2017-06-09
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sooping Saw , Rakesh Raja , Anuj Jain , Matthew Hein
IPC: H02P8/14
CPC classification number: H02P8/14
Abstract: In a described example an apparatus includes: an FET driver circuit configured to supply current to a coil in a stepper motor, the FET driver circuit configured to regulate the current to the coil using a fixed delta current; a current chopper pulse width modulated circuit coupled to the FET driver circuit configured to supply pulses corresponding to a step control signal and a direction control signal; a back electromotive force (BEMF) monitor coupled to the current chopper circuit configured to measure an off time pulse and to output a BEMF monitor signal; and a controller coupled to the current chopper pulse width modulated circuit to supply the step and direction control signals and coupled to receive the BEMF monitor signal.
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公开(公告)号：US10084402B2
公开(公告)日：2018-09-25
申请号：US15296031
申请日：2016-10-17
Applicant: Texas Instruments Incorporated
Inventor： Sooping Saw , Anuj Jain , Jeffrey Okyere , Wen Chao Qu
Abstract: A stepper motor control system includes stepper motor error reduction. For example, first and second power switches respectively energize and de-energize a stepper motor coil during each cycle for pulse-width modulating (PWM) the coil current. During a cycle including a zero crossing microstep, a calibrator detects a type of a body diode effect that occurs in the second power switch when the second switch stops de-energization of the coil. A selected offset is adjusted in response to the type of detection of the body diode effect of the second power switch. Adjusting the selected offset controls the trigger time for a comparator for comparing an offset reference voltage to a motor voltage developed in response to the coil current. Progressively adjusting the selected offset over successive cycles compensates for delays of components in the PWM control loop and reduces errors resulting from, for example, process, voltage, and temperature variations.
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公开(公告)号：US09112527B2
公开(公告)日：2015-08-18
申请号：US14135517
申请日：2013-12-19
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sudhir Nagaraj , Anuj Jain , Wenchao Qu
Abstract: Input codes are sequenced at a lower-resolution linear DAC and the output is converted to a linear current waveform. A first of two interconnected analog current multipliers multiplies the linear current by itself and by the inverse of a first constant current source to create a quadratic current output. A second current multiplier multiplies the quadratic output current by the linear current and by the inverse of a second constant current source to generate a cubic current output. The quadratic and cubic currents are subtracted from the linear current to generate an approximation of the first 180 degrees of a sine wave current. Alternate (pi to 2*pi) positive-going one-half sine waves may be polarity reversed to create a complete positive-going and negative-going sine-shaped electrical current of higher resolution than is available from a sine DAC of resolution equivalent to that of the lower-resolution linear DAC.
Abstract translation: 输入代码在较低分辨率线性DAC上排序，输出转换为线性电流波形。 两个互连的模拟电流乘法器中的第一个将线性电流本身和第一恒定电流源的反相相乘以产生二次电流输出。 第二个电流倍增器将二次输出电流乘以线性电流和第二恒定电流源的倒数，以产生立方电流输出。 从线性电流中减去二次和三次电流，以产生正弦波电流的前180度的近似。 交替的（pi至2 * pi）正向半正弦波可能会极性反转，以产生比从等效于相同的分辨率的正弦DAC获得的更高分辨率的完整的正向和负向正弦形电流 低分辨率线性DAC的。
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公开(公告)号：US10382032B2
公开(公告)日：2019-08-13
申请号：US15714643
申请日：2017-09-25
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajarshi Mukhopadhyay , Sooping Saw , Anuj Jain
Abstract: Modulating a gate drive current supplied to an output drive switch coupled to an electric motor by performing at least the following: obtain a gate drive current modulation profile, supply, based on the gate drive current modulation profile, a first gate drive current level as the gate drive current when the output drive switch is operating within a first region, drop the first gate drive current level to a second gate drive current level when the output drive switch transitions from the first region to operating within a Miller region, increase the second gate drive current level to a third gate drive current level within the Miller region, and set the gate drive current to a fourth gate drive current level when the output drive switch transitions from the Miller region to operating within a third region.
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公开(公告)号：US09742329B2
公开(公告)日：2017-08-22
申请号：US14689507
申请日：2015-04-17
Applicant: Texas Instruments Incorporated
Inventor： Sudhir Nagaraj , Anuj Jain
Abstract: A motor controller that includes a processing device and a drive circuit. The drive circuit may include a plurality of switches, a motor winding, and a current sensor coupled together in an H-bridge configuration. The processing device is configured to cause a drive current to drive through the motor winding for a minimum amount of time. The processing device is also configured to compare the current through the current sensor to a threshold value at the minimum amount of time. The processing device is also configured to, based on the current being at or above the threshold value at the minimum amount of time, stop the drive current for an off period of time and cause a first decay of the current for a first percentage of the off period of time and a first slow decay for a second percentage of the off period of time.
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Patent Agency Ranking
公开(公告)号：US09647588B2
公开(公告)日：2017-05-09
申请号：US14984834
申请日：2015-12-30
Applicant: Texas Instruments Incorporated
Inventor： Sudhir Nagaraj , David H. Elwart, II , Rakesh Raja , Anuj Jain
CPC classification number: H02P8/12 , H02P29/032
Abstract: A system and method for a decay lock loop for time varying current regulation in electric motors determines if a predetermined electrical current regulation level for an electric motor has been obtained within a tuning control time window. A coarse control loop increases or decreases a fast current decay, in response to a determination that the predetermined electrical current regulation level has not been obtained within the tuning control time window, until the predetermined electrical current regulation level falls within the tuning control time window. A fine control loop increments or decrements an amount of fast current decay during a total decay time, in response to a determination that the predetermined electrical current regulation level has been obtained within the tuning control time window, until a predetermined timing of the predetermined electrical current regulation level has been obtained.
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公开(公告)号：US20160254767A1
公开(公告)日：2016-09-01
申请号：US14984834
申请日：2015-12-30
Applicant: Texas Instruments Incorporated
Inventor： Sudhir Nagaraj , David H. Elwart, II , Rakesh Raja , Anuj Jain
IPC: H02P8/12
CPC classification number: H02P8/12 , H02P29/032
Abstract: A system and method for a decay lock loop for time varying current regulation in electric motors determines if a predetermined electrical current regulation level for an electric motor has been obtained within a tuning control time window. A coarse control loop increases or decreases a fast current decay, in response to a determination that the predetermined electrical current regulation level has not been obtained within the tuning control time window, until the predetermined electrical current regulation level falls within the tuning control time window. A fine control loop increments or decrements an amount of fast current decay during a total decay time, in response to a determination that the predetermined electrical current regulation level has been obtained within the tuning control time window, until a predetermined timing of the predetermined electrical current regulation level has been obtained.
Abstract translation: 用于电动机中时变电流调节的衰减锁定回路的系统和方法确定在调谐控制时间窗内是否已经获得了电动机的预定电流调节水平。 响应于确定在调谐控制时间窗口内没有获得预定的电流调节电平，直到预定的电流调节级别落在调谐控制时间窗口内，粗略的控制环路增加或减少快速电流衰减。 响应于在调谐控制时间窗口内已经获得预定电流调节电平的确定，直到预定电流的预定定时，精密控制环路在总衰减时间期间增加或减少快速电流衰减量 调节水平已经获得。
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8.发明申请SYSTEMS AND METHODS FOR OPERATING A HALL-EFFECT SENSOR WITHOUT AN APPLIED MAGNETIC FIELD 有权在没有应用磁场的情况下操作霍尔效应传感器的系统和方法公开(公告)号：US20150276892A1
公开(公告)日：2015-10-01
申请号：US14670078
申请日：2015-03-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： MICHAEL EDWIN BUTENHOFF , Keith Ryan Green , Anuj Jain
CPC classification number: G01R33/0023 , G01R33/072
Abstract: A method for verifying an operation of a Hall-effect sensor without an applied magnetic field. The method can include providing a bias signal to a first pair of terminals of a Hall-effect element, applying a Hall current signal to a second pair of terminals of the Hall-effect element, measuring a Hall output voltage across the second pair of terminals and comparing the measured Hall output voltage to an expected Hall output voltage that would be provided by a corresponding applied magnetic field.
Abstract translation: 一种在没有施加磁场的情况下验证霍尔效应传感器的操作的方法。 该方法可以包括向霍尔效应元件的第一对端子提供偏置信号，将霍尔电流信号施加到霍尔效应元件的第二对端子，测量第二对端子上的霍尔输出电压 并将所测量的霍尔输出电压与由相应的施加磁场提供的预期霍尔输出电压进行比较。
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公开(公告)号：US20150015177A1
公开(公告)日：2015-01-15
申请号：US14222865
申请日：2014-03-24
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anuj Jain , Mario Marascutti , Wenchao Qu , Michael Edwin Butenhoff
IPC: H02P8/32
CPC classification number: H02P8/12
Abstract: Stepper motor winding current regulation methods and apparatus continuously and bi-directionally sense winding current to determine both the magnitude of the winding current and the slope of a waveform representing the winding current. The magnitude and slope information is used to more precisely control periods of current rise and characteristics of fast and slow current decay during pulse-width modulation (“PWM”) regulation cycles. Winding current rise and decay shaping is based upon the sensed magnitude of the winding current, the magnitude of the winding current regulation set-point ITRIP, whether the sensed winding current is greater than or less than ITRIP at a selected sampling time, whether the sensed winding current is increasing or decreasing when a waveform of the sensed winding current crosses over ITRIP, and whether or not the magnitude of ITRIP changes during a PWM cycle in response to a receipt of a subsequent DAC code.
Abstract translation: 步进电机绕组电流调节方法和设备连续双向检测绕组电流，以确定绕组电流的大小和表示绕组电流的波形的斜率。 幅度和斜率信息用于更精确地控制电流上升的周期和脉冲宽度调制（“PWM”）调节周期期间快速和慢速电流衰减的特性。 绕组电流上升和衰减整形基于感测到的绕组电流的大小，绕组电流调节设定值ITRIP的幅度，无论检测到的绕组电流是否大于或小于选定采样时间的ITRIP，是否检测到 当检测到的绕组电流的波形跨越ITRIP时，绕组电流是增加或减小，以及响应于接收到的后续DAC代码，在PWM周期期间ITRIP的大小是否改变。
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公开(公告)号：US11218072B2
公开(公告)日：2022-01-04
申请号：US16459814
申请日：2019-07-02
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajarshi Mukhopadhyay , Sooping Saw , Anuj Jain
IPC: H02P6/08 , H02M1/44 , H02M7/5387 , H02M1/00
Abstract: Modulating a gate drive current supplied to an output drive switch coupled to an electric motor by performing at least the following: obtain a gate drive current modulation profile, supply, based on the gate drive current modulation profile, a first gate drive current level as the gate drive current when the output drive switch is operating within a first region, drop the first gate drive current level to a second gate drive current level when the output drive switch transitions from the first region to operating within a Miller region, increase the second gate drive current level to a third gate drive current level within the Miller region, and set the gate drive current to a fourth gate drive current level when the output drive switch transitions from the Miller region to operating within a third region.
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