Patents by Inventor Vijay Khatri

Vijay Khatri has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Variable frequency drive and methods for filter capacitor fault detection
    Patent number: 8937796
    Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node currents and/or voltages and detecting changes in a frequency component of the measured neutral condition and/or based on input current unbalance.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: January 20, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri
  • DC power for SGCT devices using a high frequency current loop with multiple current transformers
    Patent number: 8476859
    Abstract: Motor drives and switch driver power systems are presented in which high frequency AC current (IHF) is provided through one or more cables (202) magnetically coupled with local driver current transformers (240), and the transformer secondary currents are converted to provide DC power to switch drivers of an active power converter stage (110a, 110b) in the motor drive.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: July 2, 2013
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Angelo Bortolus, Bin Wu, Zhongyuan Cheng, Jahangir Afsharian, Navid Zargari, Vijay Khatri
  • VARIABLE FREQUENCY DRIVE AND METHODS FOR FILTER CAPACITOR FAULT DETECTION
    Publication number: 20120271572
    Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node currents and/or voltages and detecting changes in a frequency component of the measured neutral condition and/or based on input current unbalance.
    Type: Application
    Filed: June 26, 2012
    Publication date: October 25, 2012
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.
    Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri
  • Variable frequency drive and methods for filter capacitor fault detection
    Patent number: 8259426
    Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node current and/or voltages and detecting changes in the fundamental frequency component of the measured neutral condition at the fundamental frequency of the input power and/or based on input current unbalance.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: September 4, 2012
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri
  • DC POWER FOR SGCT DEVICES USING A HIGH FREQUENCY CURRENT LOOP WITH MULTIPLE CURRENT TRANSFORMERS
    Publication number: 20120081058
    Abstract: Motor drives and switch driver power systems are presented in which high frequency AC current (IHF) is provided through one or more cables (202) magnetically coupled with local driver current transformers (240), and the transformer secondary currents are converted to provide DC power to switch drivers of an active power converter stage (110a, 110b) in the motor drive.
    Type: Application
    Filed: September 30, 2010
    Publication date: April 5, 2012
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC
    Inventors: Angelo Bortolus, Bin Wu, Zhongyuan Cheng, Jahangir Afsharian, Navid Zargari, Vijay Khatri
  • VARIABLE FREQUENCY DRIVE AND METHODS FOR FILTER CAPACITOR FAULT DETECTION
    Publication number: 20110292696
    Abstract: Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node current and/or voltages and detecting changes in the fundamental frequency component of the measured neutral condition at the fundamental frequency of the input power and/or based on input current unbalance.
    Type: Application
    Filed: May 28, 2010
    Publication date: December 1, 2011
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.
    Inventors: Yuan Xiao, Navid Zargari, Manish Pande, Vijay Khatri