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公开(公告)号：US11641167B1
公开(公告)日：2023-05-02
申请号：US17575949
申请日：2022-01-14
Applicant: Rockwell Automation Technologies, Inc.
Inventor： James A. Ulrich , Lixiang Wei , Ahmed Mohamed Sayed Ahmed , Nickolay N. Guskov
Abstract: A transformerless parallel active rectifier system includes N multiphase common mode inductors directly connected to a shared multiphase AC input with no intervening transformer, and N active rectifiers coupled to respective ones of the N multiphase common mode inductors and having respective DC outputs coupled to a shared DC bus, where N is an integer greater than 1. The N active rectifiers have ground current regulators and are synchronized to provide DPWM switching control signals synchronized to one another to regulate their respective ground currents and concurrently regulate the shared DC bus voltage.
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Patent Agency Ranking
公开(公告)号：US20180083514A1
公开(公告)日：2018-03-22
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
CPC classification number: H02K11/33 , H02K11/022
Abstract: The disclosed apparatus provides a simple and low cost solution of reducing voltage stress on AC motors and cables in VFD fed motor systems without connecting apparatus to live circuits. 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.
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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
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.
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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
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.
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公开(公告)号：US10008952B1
公开(公告)日：2018-06-26
申请号：US15389670
申请日：2016-12-23
Applicant: Rockwell Automation Technologies, Inc.
Inventor： Jiangang Hu , Lixiang Wei , James A. Ulrich
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.
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公开(公告)号：US10476381B1
公开(公告)日：2019-11-12
申请号：US16188647
申请日：2018-11-13
Applicant: Rockwell Automation Technologies, Inc.
Inventor： Christian S. Sartler , Jeremy J. Keegan , James A. Ulrich , Amanda D. Steven , Lixiang Wei
Abstract: Power conversion systems and filters therefor include conductive busbars, a first low frequency capacitor circuit coupled with the busbars at a first location proximate a filter input, a first inductor circuit with common mode cores extending around the busbars at a second location between the first location and a filter output, a second low frequency capacitor circuit coupled with the busbars at a third location between the second location and the filter output, a second inductor circuit with second common mode cores extending around the busbars at a fourth location between the third location and the filter output, a third low-frequency capacitor circuit coupled with the busbars at a fifth location between the fourth location and the filter output, and a high frequency fourth capacitor circuit, coupled with one of the busbars at the fifth location.
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