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    Bootstrap charging by PWM control
    42.
    发明授权
    Bootstrap charging by PWM control 有权

    公开(公告)号：US10784797B1

    公开(公告)日：2020-09-22

    申请号：US16445529

    申请日：2019-06-19

    Applicant: Rockwell Automation Technologies, Inc.

    Inventor： Willy E. Sedano ,  Peizhong Yi ,  Brian P. Brown ,  Lixiang Wei

    IPC: H02M7/538 ,  H02M7/5387 ,  H02M1/084

    Abstract: A power conversion system includes a controller that generates switching control signals according to duty cycles for a current switching control cycle, and adjusts the duty cycles by a non-zero offset value according to a modulation index in response to the modulation index exceeding a non-zero threshold. A method includes computing first duty cycles according to a modulation index, generating a plurality of switching control signals according to the first duty cycles in response to the modulation index being less than or equal to a non-zero threshold, computing second duty cycles offset from the first duty cycles and generating the plurality of switching control signals according to the second duty cycles in response to the modulation index exceeding the non-zero threshold.

    Apparatus for reduced voltage stress on AC motors and cables
    43.
    发明授权
    Apparatus for reduced voltage stress on AC motors and cables 有权

    公开(公告)号：US10389213B2

    公开(公告)日：2019-08-20

    申请号：US15293899

    申请日：2016-10-14

    Applicant: Rockwell Automation Technologies, Inc.

    Inventor： Yuan Xiao ,  Navid RezA Zargari ,  Lixiang Wei ,  James A. Ulrich

    IPC: H02K11/00 ,  H02K11/33 ,  H02K11/22

    Abstract: Disclosed examples include apparatus to couple a motor drive to a motor, including a cable with a first end coupled with an output of a motor drive, a second end coupled with a motor, a plurality of conductors to convey an output signal of the motor drive between the first and second ends to drive the motor, and a plurality of shields, with a conductive junction to couple tap points of at least two of the shields together. Resistors can be used to connect the tap points to the conductive junction to provide an impedance in series with the corresponding shield to reduce voltage stress to the motor or the cable. In certain examples, the shields include a semiconductor material to provide an impedance between the first end and the conductive junction to reduce voltage stress to the motor or the cable.

    POWER CONVERSION SYSTEM WITH CONDITIONER CAPACITOR DISCHARGE APPARATUS
    45.
    发明申请
    POWER CONVERSION SYSTEM WITH CONDITIONER CAPACITOR DISCHARGE APPARATUS 审中-公开

    公开(公告)号：US20180183348A1

    公开(公告)日：2018-06-28

    申请号：US15389670

    申请日：2016-12-23

    Applicant: Rockwell Automation Technologies, Inc.

    Inventor： Jiangang Hu ,  Lixiang Wei ,  James A. Ulrich

    IPC: H02M5/42 ,  H02J7/00

    CPC classification number: H02M5/42 ,  H02M1/32 ,  H02M2001/322

    Abstract: Power conversion systems, discharge circuits and methods are disclosed for discharging a DC bus conditioner capacitor connected between a neutral node and a first reference node in a DC bus circuit of a power conversion system, in which a DC bus voltage of the power conversion system is monitored, and a discharge control DC power supply is activated in response to the DC bus voltage transitioning below a first threshold voltage to activate a switching circuit to connect a discharge resistor between the first reference node and a DC bus terminal of the DC bus circuit to at least partially discharge the conditioner capacitor through the discharge resistor.

    Motor drive filter damping
    47.
    发明授权
    Motor drive filter damping 有权

    公开(公告)号：US09923469B2

    公开(公告)日：2018-03-20

    申请号：US15149384

    申请日：2016-05-09

    Applicant: Rockwell Automation Technologies, Inc.

    Inventor： Yuan Xiao ,  Zhongyuan Cheng ,  Lixiang Wei ,  Navid R. Zargari

    IPC: H02M1/14 ,  H02M3/24 ,  H02M1/36

    CPC classification number: H02M3/24 ,  H02M1/12 ,  H02M1/36

    Abstract: Disclosed examples include methods, power converters and damping circuits to control damping of an input filter circuit, in which a low-voltage secondary winding is wound around a common core with a primary winding connected between an AC input and a rectifier input of the converter, where the secondary winding is coupled in a series circuit with a damping resistor and a switch, and a controller selectively closes the switch with a controlled on-time at system power up and/or in response to detection of oscillation or transients in the power converter.

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