公开(公告)号：US20200304109A1

公开(公告)日：2020-09-24

申请号：US16896902

申请日：2020-06-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Paul VULPOIU ,  Rakesh RAJA ,  Sudhir NAGARAJ

IPC: H03K3/017 ,  H03K21/08 ,  H03K5/24 ,  H03K7/08

Abstract: An analog signal-to-pulse width modulation (PWM) converter includes a ramp generator generating a ramp signal and a comparator circuit comparing the ramp signal to a first voltage, a second voltage, and to an analog input signal. A duty cycle calculation circuit generates a first control signal to the ramp generator to generate the ramp signal. Based on signals from the comparator circuit, the duty cycle calculation circuit calculates the ratio of the time it takes for the ramp signal to exceed the analog input signal from when the ramp signal exceeds the first voltage to the time it takes for the ramp signal to exceed the second voltage from when the ramp signal exceeds the first voltage. A PWM signal generator generates a PWM output signal based on the ratio calculated by the duty cycle calculation circuit.

公开(公告)号：US20190123725A1

公开(公告)日：2019-04-25

申请号：US15791026

申请日：2017-10-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Paul VULPOIU ,  Rakesh RAJA ,  Sudhir NAGARAJ

IPC: H03K3/017 ,  H03K4/08 ,  H03K5/24 ,  H03K21/08

CPC classification number: H03K3/017 ,  H03K4/08 ,  H03K5/24 ,  H03K7/08 ,  H03K21/08

Abstract: An analog signal-to-pulse width modulation (PWM) converter includes a ramp generator generating a ramp signal and a comparator circuit comparing the ramp signal to a first voltage, a second voltage, and an analog input signal. A duty cycle calculation circuit generates a first control signal to the ramp generator to generate the ramp signal. Based on signals from the comparator circuit, the duty cycle calculation circuit calculates the ratio of the time it takes for the ramp signal to exceed the analog input signal from when the ramp signal exceeds the first voltage to the time it takes for the ramp signal to exceed the second voltage from when the ramp signal exceeds the first voltage. A PWM signal generator generates a PWM output signal based on the ratio calculated by the duty cycle calculation circuit.

公开(公告)号：US20150303850A1

公开(公告)日：2015-10-22

申请号：US14689507

申请日：2015-04-17

Applicant: Texas Instruments Incorporated

Inventor： Sudhir NAGARAJ ,  Anuj JAIN

IPC: H02P8/12 ,  H02P7/29

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.

Abstract translation: 一种电动机控制器，包括处理装置和驱动电路。 驱动电路可以包括以H桥配置耦合在一起的多个开关，电动机绕组和电流传感器。 处理装置被配置为使得驱动电流以最小的时间量驱动通过电动机绕组。 处理装置还被配置为在最小时间内将通过电流传感器的电流与阈值进行比较。 处理装置还被配置为基于在最小时间量处于等于或高于阈值的电流，停止驱动电流关闭时间段，并导致电流的第一衰减为第一百分比 关闭时间段，第一个缓慢衰减为第二个百分比的关闭时间段。