公开(公告)号：US09553533B2

公开(公告)日：2017-01-24

申请号：US14721814

申请日：2015-05-26

Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.

Inventor： Bruce W. Weiss ,  Doyle F. Busse ,  Jeremy J. Keegan ,  Lixiang Wei ,  Michael W. Loth ,  Rangarajan M. Tallam ,  Yogesh Patel

IPC: H02M7/537 ,  H02P6/20 ,  H02H7/09 ,  H02P6/04 ,  H02M7/48

CPC classification number: H02P6/20 ,  H02H7/09 ,  H02M7/48 ,  H02M7/537 ,  H02P6/04 ,  H02P6/28

Abstract: Systems and methods are provided for pre-charging the DC bus on a motor drive. Pre-charging techniques involve pre-charge circuitry including a manual switch, an automatic switch, and pre-charge control circuitry to switch the automatic switch between pre-charge and pre-charge bypass modes in response to an initialized pre-charge operation, input voltage sags, and so forth. In some embodiments, the pre-charge operation may be initialized by switching the manual switch closed. In some embodiments, the pre-charge operation may also be initialized by a detected voltage sag on the DC bus. The pre-charge circuitry may also be configured to disconnect to isolate a motor drive from the common DC bus under certain fault conditions.

Abstract translation: 提供的系统和方法用于在电机驱动器上对DC总线进行预充电。 预充电技术涉及预充电电路，包括手动开关，自动开关和预充电控制电路，以响应于初始化的预充电操作，输入的预充电和预充电旁路模式来切换自动开关 电压骤降​​等。 在一些实施例中，预充电操作可以通过关闭手动开关来初始化。 在一些实施例中，预充电操作也可以由DC总线上的检测到的电压暂降来初始化。 预充电电路还可以被配置为在某些故障条件下将电动机驱动器与公共DC总线隔离。

公开(公告)号：US20220216692A1

公开(公告)日：2022-07-07

申请号：US17141821

申请日：2021-01-05

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Brian P. Brown ,  Amrita Sharma ,  Michael P. Albert ,  Rangarajan M. Tallam ,  Ethan B. Monroe

IPC: H02H9/02 ,  H02K11/33 ,  H02P29/024 ,  H02H9/04

Abstract: To avoid the catastrophic failure of a drive, protection circuitry is configured to limit current in the DC bus capacitors. The drive may include an isolation circuit and a protection circuit having a comparator. The protection circuit may be configured to compare the voltage measured across a DC bus capacitor with a threshold voltage and activate the isolation circuit when the DC capacitor voltage exceeds the threshold voltage. The drive may also include a low voltage circuit coupled to the isolation circuit, where the low voltage circuit is configured to interrupt the bypass signal to disengage the bypass circuit and activate the precharge circuit when the isolation circuit is activated. Accordingly, the current in the drive and to the DC bus capacitors is limited by the precharge circuit when the voltage of a capacitor in the DC bus exceeds a threshold.

公开(公告)号：US10564207B2

公开(公告)日：2020-02-18

申请号：US15409919

申请日：2017-01-19

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Rangarajan M. Tallam ,  Jiangang Hu ,  Brian P. Brown

IPC: G01R27/18 ,  G01R31/02 ,  H02M5/458 ,  G01R31/40 ,  B60L3/12 ,  H02H3/16 ,  B60L3/00 ,  B60L3/04 ,  H02H7/12

Abstract: Power conversion systems, ground fault detection apparatus and methods to detect and identify ground faults in a power conversion system using AC coupling to sense a system voltage to determine a leakage flux linkage, and to identify a faulted converter phase based on a phase shift angle of the leakage flux linkage.

公开(公告)号：US20190393822A1

公开(公告)日：2019-12-26

申请号：US16019222

申请日：2018-06-26

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Nandini Ganesan ,  Rangarajan M. Tallam

IPC: H02P27/08 ,  H02K11/27

Abstract: A motor drive system includes at least one current sensor disposed within a housing of the motor drive system. The at least one sensor is configured to detect a current of output power produced by the motor drive system. The motor drive system also includes a controller configured to determine a resonant frequency of a cable connected to the motor drive system based at least in part on the detected current, and to adjust pulse width modulation (PWM) switching of the motor drive system based at least in part on the determined resonant frequency of the cable.