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    MOTOR CONTROL SYSTEM WITH PHASE CURRENT POLARITY DETECTION
    2.
    发明申请
    MOTOR CONTROL SYSTEM WITH PHASE CURRENT POLARITY DETECTION 有权

    公开(公告)号：US20210044242A1

    公开(公告)日：2021-02-11

    申请号：US16535271

    申请日：2019-08-08

    Applicant: Allegro MicroSystems, LLC

    Inventor： Kamyar Khosravi ,  Masahira Kurihara ,  Gianluca Allegrini ,  Robert D. Christie

    IPC: H02P27/08 ,  H02M7/5387 ,  H02M1/38

    Abstract: A system is provided for driving a load such as a multi-phase motor. The system includes a motor driver that has a plurality of switches coupled to a motor to drive a current through each of a plurality of phase coils of the motor. A polarity detection circuit detects a polarity of the current in one or more of the phase coils of the motor to generate a polarity value that represents the detected current polarity. The polarity detection circuit can include at least one comparator that has a first input coupled to a node between two of the plurality of switches, a second input coupled to receive a threshold value, and an output from which the polarity value is provided. Further included is a controller that is configured to provide a plurality of pulse width modulated (PWM) output control signals to the plurality of switches to control the switches to drive the current through the plurality of phase coils of the motor. In response to the polarity value, the controller is configured to alter a duty cycle of the plurality of PWM output control signals to modify a voltage applied to the plurality of phase coils of the motor.

    Electric Motor Drive Isolation Circuit
    3.
    发明申请
    Electric Motor Drive Isolation Circuit 有权
    电机驱动隔离电路

    公开(公告)号：US20150288304A1

    公开(公告)日：2015-10-08

    申请号：US14678388

    申请日：2015-04-03

    Applicant: ALLEGRO MICROSYSTEMS, LLC

    Inventor： Edward Chappell ,  Robert D. Christie ,  James McIntosh ,  Peter Morris

    IPC: H02P6/12 ,  H02P6/00

    CPC classification number: H02H7/08 ,  H02H7/0844 ,  H02H7/1227 ,  H02P29/0241

    Abstract: An isolation circuit is coupled between motor driver half bridge circuits and an electric motor. A motor controller circuit supplies motor drive signals to the motor driver half bridge circuits. The isolation circuit includes transistors coupled in series with the motor windings. Low to medium power diodes are coupled between a reference voltage source and control terminals of the transistors.

    Abstract translation: 隔离电路耦合在电机驱动器半桥电路和电动马达之间。 马达控制器电路将马达驱动信号提供给马达驱动器半桥电路。 隔离电路包括与电动机绕组串联耦合的晶体管。 低功率到中等功率二极管耦合在参考电压源和晶体管的控制端之间。

    Circuits and techniques for signaling between devices
    4.
    发明授权
    Circuits and techniques for signaling between devices 有权

    公开(公告)号：US09935452B2

    公开(公告)日：2018-04-03

    申请号：US14940552

    申请日：2015-11-13

    Applicant: Allegro Microsystems, LLC

    Inventor： Christy Looby ,  Robert D. Christie

    IPC: H02H3/00 ,  H02H3/04 ,  H02M7/00 ,  H02M7/5387 ,  H02H9/02 ,  H03K17/082 ,  H02H3/087

    CPC classification number: H02H3/044 ,  H02H3/087 ,  H02H9/02 ,  H02M7/00 ,  H02M7/5387 ,  H03K17/0822

    Abstract: A method for signaling between a controller and a driver includes receiving, at a pin of the driver coupled to the controller, a command signal generated by the controller and generating, by the driver at the pin coupled to the controller, a fault signal indicating a fault condition. The driver can be configured to drive a switch and the command signal can be configured to cause the driver to open the switch when the command signal is in a first state and to close the switch when the command signal is in a second state. The command signal being in the first state may correspond to the command signal having a voltage level above a first predetermined threshold and the command signal being in the second state may correspond to the command signal having a voltage level below a second predetermined threshold.

    Electric motor drive isolation circuit
    5.
    发明授权
    Electric motor drive isolation circuit 有权
    电机驱动隔离电路

    公开(公告)号：US09496708B2

    公开(公告)日：2016-11-15

    申请号：US14678388

    申请日：2015-04-03

    Applicant: Allegro MicroSystems, LLC

    Inventor： Edward Chappell ,  Robert D. Christie ,  James McIntosh ,  Peter Morris

    IPC: H02H7/08 ,  H02H7/122

    CPC classification number: H02H7/08 ,  H02H7/0844 ,  H02H7/1227 ,  H02P29/0241

    Abstract: An isolation circuit is coupled between motor driver half bridge circuits and an electric motor. A motor controller circuit supplies motor drive signals to the motor driver half bridge circuits. The isolation circuit includes transistors coupled in series with the motor windings. Low to medium power diodes are coupled between a reference voltage source and control terminals of the transistors.

    Abstract translation: 隔离电路耦合在电机驱动器半桥电路和电动马达之间。 马达控制器电路将马达驱动信号提供给马达驱动器半桥电路。 隔离电路包括与电动机绕组串联耦合的晶体管。 低功率到中等功率二极管耦合在参考电压源和晶体管的控制端之间。

    Multi-stage slew rate control profiling for transistor drive applications
    6.
    发明授权
    Multi-stage slew rate control profiling for transistor drive applications 有权
    晶体管驱动应用的多级转换速率控制分析

    公开(公告)号：US09294084B1

    公开(公告)日：2016-03-22

    申请号：US14554396

    申请日：2014-11-26

    Applicant: Allegro Microsystems, LLC

    Inventor： James McIntosh ,  Robert D. Christie ,  Colin Hall ,  Alistair Wood

    IPC: H03K3/00 ,  H03K17/16 ,  H03K17/12

    CPC classification number: H03K17/165 ,  H03K17/04123 ,  H03K17/122 ,  H03K17/127 ,  H03K17/162 ,  H03K17/168 ,  H03K2217/0063 ,  H03K2217/0072

    Abstract: A transistor drive circuit uses multi-stage slew rate control to drive one or more switching transistors. After a decision is made to change transistor state, a first drive current may be applied to an input terminal of the transistor for a predetermined time duration. After the predetermined time duration, a second drive current may be applied to the input terminal. When the transition between states is substantially complete, the current drive to the input terminal may be changed to a voltage drive. In some embodiments, the predetermined time duration may be based on the start time of a Miller plateau during the transition period.

    Abstract translation: 晶体管驱动电路使用多级压摆率控制来驱动一个或多个开关晶体管。 在做出改变晶体管状态的决定之后，可以将第一驱动电流施加到晶体管的输入端子一段预定的持续时间。 在预定的持续时间之后，可以向输入端施加第二驱动电流。 当状态之间的转变基本上完成时，到输入端的当前驱动可以改变为电压驱动。 在一些实施例中，预定持续时间可以基于在过渡期间的米勒平台的开始时间。

    Motor control system with phase current polarity detection
    7.
    发明授权
    Motor control system with phase current polarity detection 有权

    公开(公告)号：US10924052B1

    公开(公告)日：2021-02-16

    申请号：US16535271

    申请日：2019-08-08

    Applicant: Allegro MicroSystems, LLC

    Inventor： Kamyar Khosravi ,  Masahira Kurihara ,  Gianluca Allegrini ,  Robert D. Christie

    IPC: H02P27/00 ,  H02P27/08 ,  H02M1/38 ,  H02M7/5387

    Abstract: A system is provided for driving a load such as a multi-phase motor. The system includes a motor driver that has a plurality of switches coupled to a motor to drive a current through each of a plurality of phase coils of the motor. A polarity detection circuit detects a polarity of the current in one or more of the phase coils of the motor to generate a polarity value that represents the detected current polarity. The polarity detection circuit can include at least one comparator that has a first input coupled to a node between two of the plurality of switches, a second input coupled to receive a threshold value, and an output from which the polarity value is provided. Further included is a controller that is configured to provide a plurality of pulse width modulated (PWM) output control signals to the plurality of switches to control the switches to drive the current through the plurality of phase coils of the motor. In response to the polarity value, the controller is configured to alter a duty cycle of the plurality of PWM output control signals to modify a voltage applied to the plurality of phase coils of the motor.

    Reconstruction of an average motor supply current using phase current measurement
    8.
    发明授权
    Reconstruction of an average motor supply current using phase current measurement 有权

    公开(公告)号：US10819257B1

    公开(公告)日：2020-10-27

    申请号：US16561334

    申请日：2019-09-05

    Applicant: Allegro MicroSystems, LLC

    Inventor： Kamyar Khosravi ,  Masahira Kurihara ,  Andrew Adib ,  Robert D. Christie

    IPC: H02P6/15

    Abstract: Systems and methods for computing an average supply current to a motor include a current sensor that is configured to sense a current through the motor. A converter is configured to sample the output of the current sensor at times that are established by a trigger signal and convert the samples into digital current values. A trigger signal generator generates the trigger signal based on one or more pulse width modulated (PWM) motor control signals within a PWM cycle. An average supply current value that indicates the average supply current to the motor is computed by a controller using the digital current values received from the converter.

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