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.

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

IPC: H02P8/32 ,  H02P8/34 ,  H02P8/12 ,  H02P6/08

CPC classification number: H02P8/32 ,  H02P6/085 ,  H02P8/12 ,  H02P8/22 ,  H02P8/34

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.

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

IPC: H03M1/66 ,  G06G7/22 ,  H02P8/22

CPC classification number: H03M1/661 ,  G06G7/22 ,  H02P8/22

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。

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.

公开(公告)号：US20170346425A1

公开(公告)日：2017-11-30

申请号：US15682008

申请日：2017-08-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sudhir Nagaraj ,  Anuj Jain

IPC: H02P7/29 ,  H02P8/22 ,  H02P8/12

CPC classification number: H02P7/29 ,  H02P8/12 ,  H02P8/22

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.

公开(公告)号：US20170272011A1

公开(公告)日：2017-09-21

申请号：US15615951

申请日：2017-06-07

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Stephen John Fedigan ,  Anuj Jain ,  David Patrick Magee

IPC: H02P6/16

CPC classification number: H02P6/16 ,  G01R33/072 ,  G01R33/077 ,  H02K29/08 ,  H02P21/06 ,  H02P25/03

Abstract: A motor control system for a permanent magnet synchronous motor (PMSM) uses two linear Hall devices to produce a first signal indicative of a strength of a first magnetic field component produced by a set of rotor magnets and to simultaneously produce a second signal indicative of a strength of second magnetic field component produced by the rotor magnets that is approximately orthogonal to the first magnetic field component. An angular position and angular velocity of the rotor is calculated based on the first signal and the second signal. A plurality of phase signals is produced based on the calculated angular position and angular velocity. Current in a plurality of field windings of the motor is controlled using the plurality of phase signals.

公开(公告)号：US20170163182A1

公开(公告)日：2017-06-08

申请号：US14960164

申请日：2015-12-04

Applicant: Texas Instruments Incorporated

Inventor： Stephen John Fedigan ,  Anuj Jain ,  David Patrick Magee

IPC: H02P6/16

CPC classification number: H02P6/16 ,  H02P21/06

Abstract: A motor control system for a permanent magnet synchronous motor (PMSM) uses two linear Hall devices to produce a first signal indicative of a strength of a first magnetic field component produced by a set of rotor magnets and to simultaneously produce a second signal indicative of a strength of second magnetic field component produced by the rotor magnets that is approximately orthogonal to the first magnetic field component. An angular position and angular velocity of the rotor is calculated based on the first signal and the second signal. A plurality of phase signals is produced based on the calculated angular position and angular velocity. Current in a plurality of field windings of the motor is controlled using the plurality of phase signals.

公开(公告)号：US09397597B2

公开(公告)日：2016-07-19

申请号：US14257998

申请日：2014-04-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Wenchao Qu ,  Anuj Jain ,  Ryan Paul Kehr

IPC: H02P8/00 ,  H02P8/12

CPC classification number: H02P8/12

Abstract: Stepper motor winding current regulation methods and apparatus adapt a maximum blanking period to generate an adapted blanking period that is proportional to a currently-selected current regulation set-point. Sensed winding current feedback is ignored at a current regulation controller during the adapted blanking period or during a minimum blanking period, whichever longer, to avoid attempting to track noise imposed upon a sensed winding current feedback signal at an initiation of rapid current changes di/dt. Doing so may decrease ripple in the motor winding current waveform and reduce zero-crossing distortion by decreasing overshoot of the current regulation set-point by the sensed winding current.

Abstract translation: 步进电机绕组电流调节方法和装置适应最大消隐周期以产生与当前选择的电流调节设定点成比例的适配消隐周期。 感应绕组电流反馈在适配的消隐期间或在最小消隐期间（较短时间内）在电流调节控制器处被忽略，以避免在快速电流变化开始时跟踪感测到的​​绕组电流反馈信号的噪声di / dt 。 这样做可能会降低电机绕组电流波形的波动，并通过减小感测绕组电流对电流调节设定值的过冲来减小过零失真。

公开(公告)号：US09246424B2

公开(公告)日：2016-01-26

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: H02P8/00 ,  H02P8/12

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。

公开(公告)号：US20150028790A1

公开(公告)日：2015-01-29

申请号：US14257998

申请日：2014-04-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Wenchao Qu ,  Anuj Jain ,  Ryan Paul Kehr

IPC: H02P8/00

CPC classification number: H02P8/12

Abstract: Stepper motor winding current regulation methods and apparatus adapt a maximum blanking period to generate an adapted blanking period that is proportional to a currently-selected current regulation set-point. Sensed winding current feedback is ignored at a current regulation controller during the adapted blanking period or during a minimum blanking period, whichever longer, to avoid attempting to track noise imposed upon a sensed winding current feedback signal at an initiation of rapid current changes di/dt. Doing so may decrease ripple in the motor winding current waveform and reduce zero-crossing distortion by decreasing overshoot of the current regulation set-point by the sensed winding current.

Abstract translation: 步进电机绕组电流调节方法和装置适应最大消隐周期以产生与当前选择的电流调节设定点成比例的适配消隐周期。 感应绕组电流反馈在适配的消隐期间或在最小消隐期间（较短时间内）在电流调节控制器处被忽略，以避免在快速电流变化开始时跟踪感测到的​​绕组电流反馈信号的噪声di / dt 。 这样做可能会降低电机绕组电流波形的波动，并通过减小感测绕组电流对电流调节设定值的过冲来减小过零失真。