Patents by Inventor Rangarajan Tallam
Rangarajan Tallam 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).
-
Publication number: 20230400845Abstract: An industrial system and a method including using a processor, estimating a reliability of a component of an industrial system using a prognostic model program, using the processor, updating weighting vector parameters of the prognostic model program based on collected data and a previous reliability estimate using machine learning, and using the processor, selectively generating a warning based on comparison of the reliability with a threshold and/or deviation of weighting vector parameters.Type: ApplicationFiled: June 13, 2022Publication date: December 14, 2023Applicant: Rockwell Automation Technologies, Inc.Inventors: Yujia Cui, Jiangang Hu, Rangarajan Tallam, Robert J. Miklosovic
-
Patent number: 10389263Abstract: Motor drive power conversion systems are provided including a rectifier and a switching inverter, wherein the switching devices of the rectifier, the inverter and/or of a DC/DC converter are silicon carbide switches, such as silicon carbide MOSFETs. Driver circuits are provided for providing bipolar gate drive signals to the silicon carbide MOSFETs, including providing negative gate-source voltage for controlling the off state of enhancement mode low side drivers and positive gate-source voltage for controlling the off state of enhancement mode high side drivers.Type: GrantFiled: October 2, 2017Date of Patent: August 20, 2019Assignee: Rockwell Automation Technologies, Inc.Inventors: Kevin Baumann, Richard Lukaszewski, Rangarajan Tallam, Lixiang Wei, Lee Gettelfinger, Garron Morris, Bruce Weiss, Neil Gollhardt, Navid R. Zargari, William Brumsickle, Robert Wright Reese, Stephen E. Denning
-
Publication number: 20180026544Abstract: Motor drive power conversion systems are provided including a rectifier and a switching inverter, wherein the switching devices of the rectifier, the inverter and/or of a DC/DC converter are silicon carbide switches, such as silicon carbide MOSFETs. Driver circuits are provided for providing bipolar gate drive signals to the silicon carbide MOSFETs, including providing negative gate-source voltage for controlling the off state of enhancement mode low side drivers and positive gate-source voltage for controlling the off state of enhancement mode high side drivers.Type: ApplicationFiled: October 2, 2017Publication date: January 25, 2018Applicant: Rockwell Automation Technologies, Inc.Inventors: Kevin Baumann, Richard Lukaszewski, Rangarajan Tallam, Lixiang Wei, Lee Gettelfinger, Garron Morris, Bruce Weiss, Neil Gollhardt, Navid R. Zargari, William Brumsickle, Robert Wright Reese, Stephen E. Denning
-
Patent number: 9787210Abstract: Precharging systems and methods are presented for precharging a DC bus circuit in a power conversion system, in which precharging current is connected through a precharging resistance coupled between only a single AC input line and the DC bus circuit when the DC bus voltage is less than a non-zero threshold, and a controller individually activates controllable rectifier switching devices when the DC bus voltages greater than or equal to the threshold using DC gating or pulse width modulation to selectively provide a bypass path around the precharging resistance for normal load currents in the power conversion system.Type: GrantFiled: January 14, 2015Date of Patent: October 10, 2017Assignee: Rockwell Automation Technologies, Inc.Inventors: Yogesh P. Patel, Rangarajan Tallam, Brian P. Brown, Jiangang Hu, James J. Campbell
-
Patent number: 9787212Abstract: Motor drive power conversion systems are provided including a rectifier and a switching inverter, wherein the switching devices of the rectifier, the inverter and/or of a DC/DC converter are silicon carbide switches, such as silicon carbide MOSFETs. Driver circuits are provided for providing bipolar gate drive signals to the silicon carbide MOSFETs, including providing negative gate-source voltage for controlling the off state of enhancement mode low side drivers and positive gate-source voltage for controlling the off state of enhancement mode high side drivers.Type: GrantFiled: April 29, 2015Date of Patent: October 10, 2017Assignee: Rockwell Automation Technologies, Inc.Inventors: Kevin Baumann, Richard Lukaszewski, Rangarajan Tallam, Lixiang Wei, Lee Gettelfinger, Garron Morris, Bruce Weiss, Neil Gollhardt, Navid R. Zargari, William Brumsickle, Robert Wright Reese, Stephen E. Denning
-
Publication number: 20160204709Abstract: Precharging systems and methods are presented for precharging a DC bus circuit in a power conversion system, in which precharging current is connected through a precharging resistance coupled between only a single AC input line and the DC bus circuit when the DC bus voltage is less than a non-zero threshold, and a controller individually activates controllable rectifier switching devices when the DC bus voltages greater than or equal to the threshold using DC gating or pulse width modulation to selectively provide a bypass path around the precharging resistance for normal load currents in the power conversion system.Type: ApplicationFiled: January 14, 2015Publication date: July 14, 2016Applicant: Rockwell Automation Technologies, Inc.Inventors: Yogesh P. Patel, Rangarajan Tallam, Brian P. Brown, Jiangang Hu, James J. Campbell
-
Patent number: 9374021Abstract: Output voltage feedback systems and methods are provided for controlling voltage source inverter output voltages using low bandwidth buffer circuitry and low A/D converter sample rates to sense and sample PWM output voltage waveforms to provide an estimated volt-second value for phase voltage or line-line voltage as feedback for controlling the voltage source inverter.Type: GrantFiled: December 16, 2013Date of Patent: June 21, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Rangarajan Tallam, Doyle F. Busse, Brian P. Brown, Russel J. Kerkman
-
Publication number: 20160172992Abstract: Power converters are presented having a precharging resistance and a normally closed precharging switch with a controller to limit inrush current during precharging of a DC bus circuit capacitance while preventing operation of rectifier switching devices until the DC bus voltage reaches a threshold value, and then to open the precharging switch and allow selective operation of the rectifier switching devices, with a second capacitance coupled across a rectifier output to mitigate rectifier output voltage spikes due to common mode currents flowing through a DC link choke, and additional capacitors coupled between positive and negative rectifier output terminals and ground to limit the rectifier output terminal voltages with respect to ground.Type: ApplicationFiled: December 16, 2014Publication date: June 16, 2016Applicant: Rockwell Automation Technologies, Inc.Inventors: Rangarajan Tallam, Doyle F. Busse, Alia Rebecca Strandt
-
Patent number: 9294005Abstract: Methods and systems are disclosed for detecting capacitor degradation in an input filter of an active front end power conversion system in which voltage and current sensing is performed to determine sequence component impedance asymmetry to detect filter capacitor degradation according to the value of an off-axis admittance matrix component for Delta or Y-connected filter capacitor banks without sensitivity to voltage unbalance, and with the capability to identify particular degraded capacitor locations based on individual impedance values.Type: GrantFiled: October 1, 2013Date of Patent: March 22, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Rangarajan Tallam, Russel Kerkman
-
Patent number: 9270210Abstract: A distributed motor drive system includes a power management module and multiple inverter modules integrated with the motors and located on a machine or process remote from the power management module. The power management module distributes DC voltage and command signals to each of the inverters, where the DC voltage is distributed between modules via a DC link cable. The integrated inverters execute switching routines to convert the DC voltage to an AC voltage suitable for controlling the motor. Each of the power management module and the inverters includes a portion of the DC bus. The current on the DC link cable is monitored and general bus utilization as well as overload conditions are reported.Type: GrantFiled: June 10, 2014Date of Patent: February 23, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Mark A. Gries, Mark R. Cooper, Rangarajan Tallam, Garrett B. Rodrigues
-
Regenerative voltage doubler rectifier, voltage sag/swell correction apparatus and operating methods
Patent number: 9246411Abstract: Single and multiphase regenerative voltage doubler rectifiers, sag/swell corrector apparatus, and operating methods are presented in which rectifier switching devices are selectively pulse width modulated for regenerative load conditions and for regenerating power during input voltage swell circumstances.Type: GrantFiled: October 16, 2012Date of Patent: January 26, 2016Assignee: Rockwell Automation Technologies, Inc.Inventor: Rangarajan Tallam -
Publication number: 20150318791Abstract: Motor drive power conversion systems are provided including a rectifier and a switching inverter, wherein the switching devices of the rectifier, the inverter and/or of a DC/DC converter are silicon carbide switches, such as silicon carbide MOSFETs. Driver circuits are provided for providing bipolar gate drive signals to the silicon carbide MOSFETs, including providing negative gate-source voltage for controlling the off state of enhancement mode low side drivers and positive gate-source voltage for controlling the off state of enhancement mode high side drivers.Type: ApplicationFiled: April 29, 2015Publication date: November 5, 2015Applicant: Rockwell Automation Technologies, Inc.Inventors: Kevin Baumann, Richard Lukaszewski, Rangarajan Tallam, Lixiang Wei, Lee Gettelfinger, Garron Morris, Bruce Weiss, Neil Gollhardt, Navid R. Zargari, William Brumsickle, Robert Wright Reese, Stephen E. Denning
-
Publication number: 20150171772Abstract: Output voltage feedback systems and methods are provided for controlling voltage source inverter output voltages using low bandwidth buffer circuitry and low A/D converter sample rates to sense and sample PWM output voltage waveforms to provide an estimated volt-second value for phase voltage or line-line voltage is feedback for controlling the voltage source inverter.Type: ApplicationFiled: December 16, 2013Publication date: June 18, 2015Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: RANGARAJAN TALLAM, DOYLE F. BUSSE, BRIAN P. BROWN, RUSSEL J. KERKMAN
-
Publication number: 20150092460Abstract: Methods and systems are disclosed for detecting capacitor degradation in an input filter of an active front end power conversion system in which voltage and current sensing is performed to determine sequence component impedance asymmetry to detect filter capacitor degradation according to the value of an off-axis admittance matrix component for Delta or Y-connected filter capacitor banks without sensitivity to voltage unbalance, and with the capability to identify particular degraded capacitor locations based on individual impedance values.Type: ApplicationFiled: October 1, 2013Publication date: April 2, 2015Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Rangarajan Tallam, Russel Kerkman
-
Patent number: 8860335Abstract: A distributed motor drive system includes a power management module and multiple inverter modules integrated with the motors and located on a machine or process remote from the power management module. The power management module distributes DC voltage and command signals to each of the inverters. The DC voltage is distributed between modules via a DC link cable. The integrated inverters execute switching routines to convert the DC voltage to an AC voltage suitable for controlling the motor. Each of the power management module and the inverters includes a portion of the DC bus capacitance. The distributed motor drive system also includes a link inductance between the power management module and the inverters to limit the amount of reactive current generated by the inverters.Type: GrantFiled: November 14, 2011Date of Patent: October 14, 2014Assignee: Rockwell Automation Technologies, Inc.Inventors: Mark A. Gries, Mark R. Cooper, Rangarajan Tallam, Garrett B. Rodrigues
-
Publication number: 20140285120Abstract: A distributed motor drive system includes a power management module and multiple inverter modules integrated with the motors and located on a machine or process remote from the power management module. The power management module distributes DC voltage and command signals to each of the inverters, where the DC voltage is distributed between modules via a DC link cable. The integrated inverters execute switching routines to convert the DC voltage to an AC voltage suitable for controlling the motor. Each of the power management module and the inverters includes a portion of the DC bus. The current on the DC link cable is monitored and general bus utilization as well as overload conditions are reported.Type: ApplicationFiled: June 10, 2014Publication date: September 25, 2014Inventors: Mark A. Gries, Mark R. Cooper, Rangarajan Tallam, Garrett B. Rodrigues
-
Patent number: 8766584Abstract: A distributed motor drive system includes a power management module and multiple inverter modules integrated with the motors and located on a machine or process remote from the power management module. The power management module distributes DC voltage and command signals to each of the inverters, where the DC voltage is distributed between modules via a DC link cable. The integrated inverters execute switching routines to convert the DC voltage to an AC voltage suitable for controlling the motor. Each of the power management module and the inverters includes a portion of the DC bus. The current on the DC link cable is monitored and general bus utilization as well as overload conditions are reported.Type: GrantFiled: November 14, 2011Date of Patent: July 1, 2014Assignee: Rockwell Automation Technologies, Inc.Inventors: Mark A. Gries, Mark R. Cooper, Rangarajan Tallam, Garrett B. Rodrigues
-
Patent number: 8704481Abstract: The present invention relates generally to systems and methods for detecting ground faults (i.e., line-to-ground faults) in motor drive systems. In particular, the embodiments described herein include a common mode choke of a motor drive system having additional (i.e., secondary) turns wound around a core of the common mode choke. These secondary turns are in addition to and separate from a plurality of sets of primary turns wound around the core of the common mode choke, each set of primary turns corresponding to a phase of AC power to which the common mode choke is directly coupled. The secondary turns terminate in series with a burden resistor. Ground faults may be detected by monitoring the voltage across the burden resistor.Type: GrantFiled: January 26, 2011Date of Patent: April 22, 2014Assignee: Rockwell Automation Technologies, Inc.Inventors: Carlos Rodriguez Valdez, Rangarajan Tallam, Russel Kerkman
-
REGENERATIVE VOLTAGE DOUBLER RECTIFIER, VOLTAGE SAG/SWELL CORRECTION APPARATUS AND OPERATING METHODS
Publication number: 20140104896Abstract: Single and multiphase regenerative voltage doubler rectifiers, sag/swell corrector apparatus, and operating methods are presented in which rectifier switching devices are selectively pulse width modulated for regenerative load conditions and for regenerating power during input voltage swell circumstances.Type: ApplicationFiled: October 16, 2012Publication date: April 17, 2014Inventor: Rangarajan Tallam -
Publication number: 20130119902Abstract: A distributed motor drive system includes a power management module and multiple inverter modules integrated with the motors and located on a machine or process remote from the power management module. The power management module distributes DC voltage and command signals to each of the inverters, where the DC voltage is distributed between modules via a DC link cable. The integrated inverters execute switching routines to convert the DC voltage to an AC voltage suitable for controlling the motor. Each of the power management module and the inverters includes a portion of the DC bus. The current on the DC link cable is monitored and general bus utilization as well as overload conditions are reported.Type: ApplicationFiled: November 14, 2011Publication date: May 16, 2013Inventors: Mark A. Gries, Mark R. Cooper, Rangarajan Tallam, Garrett B. Rodrigues