Patents by Inventor Vijay Bhavaraju

Vijay Bhavaraju 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: 20200177016
    Abstract: Power is provided from a power source and a status of the power source is signaled by controlling a waveform of an AC voltage generated from the power source. The status may include, for example, a capacity of the power source. In some embodiments, a frequency of the AC voltage may be controlled to signal the status. The power source may include, for example, an uninterruptible power supply (UPS), and signaling a status of the power source may include controlling an inverter of the UPS to signal the status. Related systems are also described.
    Type: Application
    Filed: October 11, 2019
    Publication date: June 4, 2020
    Inventors: Yakov Lvovich Familiant, MIchael P. Nowak, Vijay Bhavaraju, George Arthur Navarro
  • Patent number: 10447072
    Abstract: Power is provided from a power source and a status of the power source is signaled by controlling a waveform of an AC voltage generated from the power source. The status may include, for example, a capacity of the power source. In some embodiments, a frequency of the AC voltage may be controlled to signal the status. The power source may include, for example, an uninterruptible power supply (UPS), and signaling a status of the power source may include controlling an inverter of the UPS to signal the status. Related systems are also described.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: October 15, 2019
    Assignee: Eaton Intelligent Power Limited
    Inventors: Yakov Lvovich Familiant, Michael P. Nowak, Vijay Bhavaraju, George Arthur Navarro
  • Patent number: 10056851
    Abstract: A system and method for estimating operating characteristics of an induction motor is disclosed. The system includes a motor control device that is electrically connectable between a motor and a power source. The motor control device includes a plurality of switching devices comprising at least one thyristor corresponding to a respective phase of the motor. The motor control device also includes a controller programmed to disconnect the power source from the motor for a predetermined time period following a first plurality of cycles of a mains phase voltage of the power source. The controller is further programmed to measure a back-emf voltage during the predetermined time period, estimate an operating characteristic of the motor from the measured back-emf voltage, and trigger the plurality of switching devices to reconnect the power source to the motor following estimation of the operating characteristic.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: August 21, 2018
    Assignee: Eaton Corporation
    Inventors: Dongxiao Wu, Bruno Patrice-Bernard Lequesne, Yahan Hua, Vijay Bhavaraju, Kaijam M. Woodley, Steven Andrew Dimino
  • Patent number: 9941700
    Abstract: An energy system includes renewable energy sources each including an inverter. The renewable source inverters are coupled to a distribution line in a manner wherein power combines additively. The system also includes an energy storage source including an energy storage inverter coupled to the distribution line between the point of interconnection and the renewable source inverters. Finally, a control system is structured to: (i) control a voltage at the point of interconnection by controlling a renewable source reactive power output by the renewable source inverters and an energy storage reactive power output by the energy storage inverter, and (ii) provide power ramp rate control for the renewable energy system by controlling at least one of a renewable source real power output by each of the renewable source inverters and a first energy storage real power output by the energy storage inverter.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: April 10, 2018
    Assignee: EATON INTELLIGENT POWER LIMITED
    Inventors: Vijay Bhavaraju, Qiang Fu, Yakov L. Familiant, Christopher S. Thompson
  • Patent number: 9620994
    Abstract: A system for detecting islanding of a microgrid includes a number of power sources to output real power and controlled reactive power injection; a number of controllers each controlling one of the number of power sources; and an output from the microgrid powered by the number of power sources. A number of electrical switching apparatus electrically connect the output from the microgrid to a grid and electrically disconnect the output from the microgrid from the grid. A microgrid controller detects islanding of the microgrid with respect to the grid, and sends a number of commands to a number of the number of controllers in order to control reactive power injection by a number of the number of power sources. A communication channel is between the microgrid controller and the number of controllers. A number of microgrid loads are powered by the output from the microgrid.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: April 11, 2017
    Assignee: EATON CORPORATION
    Inventor: Vijay Bhavaraju
  • Patent number: 9502904
    Abstract: A power conversion system includes a number of photovoltaic arrays, a number of inverters, a transformer, and processor. The processor is structured to control the number of inverters and operate the power conversion system to provide maximum efficiency of power conversion by the number of photovoltaic arrays, the number of inverters and the transformer, and to maximize power output from the number of photovoltaic arrays.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: November 22, 2016
    Assignee: EATON CORPORATION
    Inventors: Vijay Bhavaraju, Richard P. Peplinski, Anish Prasai
  • Patent number: 9502901
    Abstract: An area electric power system includes a number of direct current power sources, and a number of inverters operatively associated with the number of direct current power sources. Each of the number of inverters is structured to provide real power and controlled reactive power injection to detect islanding. An output is powered by the number of inverters. A number of electrical switching apparatus are structured to electrically connect the number of inverters to and electrically disconnect the number of inverters from a utility grid. A number of devices are structured to detect islanding with respect to the utility grid responsive to a number of changes of alternating current frequency or voltage of the output.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: November 22, 2016
    Assignee: EATON CORPORATION
    Inventors: Vijay Bhavaraju, Richard P. Peplinski, Anish Prasai, Uday Mhaskar
  • Patent number: 9425702
    Abstract: A system and method for controlling switching in an AC-AC converter is disclosed. A controller for the AC-AC converter determines a direction of current flow on supply lines that provide AC power to the AC-AC converter and determines a switching pattern for each of a plurality of line-side switches and each of a plurality of floating-neutral side switches in the AC-AC converter based on the determined direction of current flow on each of the supply lines. The controller causes the line-side switches and the floating-neutral side switches to operate in an ON or OFF condition according to the determined switching pattern, such that a controlled current flow is output from the AC-AC converter. The controller also implements a safe-switching routine when transitioning from a first switching pattern to a second switching pattern that prevents a non-zero current from being interrupted during the transitioning between the first and second switching patterns.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: August 23, 2016
    Assignee: Eaton Corporation
    Inventors: Bruno Patrice-Bernard Lequesne, Yakov Lvovich Familiant, Qiang Fu, Vijay Bhavaraju
  • Patent number: 9397657
    Abstract: An integrated circuit includes a hybrid switch having first and second switching devices of different type therein. A control circuit is provided, which is configured to drive the first and second devices with respective first and second control signals having first and second unequal duty cycles, respectively, when the first and second devices are supporting a forward current in a first current range. The control circuit is further configured to drive the first and second devices with respective third and fourth control signals having third and fourth unequal duty cycles, respectively, when the first and second devices are supporting a forward current in a second current range outside the first current range. The first duty cycle may be greater than the second duty cycle and the third duty cycle may be less than the fourth duty cycle.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: July 19, 2016
    Assignee: Eaton Corporation
    Inventors: Tiefu Zhao, Jiangbiao He, Vijay Bhavaraju, Mengbin Ben Yang
  • Publication number: 20160191046
    Abstract: An integrated circuit includes a hybrid switch having first and second switching devices of different type therein. A control circuit is provided, which is configured to drive the first and second devices with respective first and second control signals having first and second unequal duty cycles, respectively, when the first and second devices are supporting a forward current in a first current range. The control circuit is further configured to drive the first and second devices with respective third and fourth control signals having third and fourth unequal duty cycles, respectively, when the first and second devices are supporting a forward current in a second current range outside the first current range. The first duty cycle may be greater than the second duty cycle and the third duty cycle may be less than the fourth duty cycle.
    Type: Application
    Filed: December 19, 2014
    Publication date: June 30, 2016
    Inventors: Tiefu Zhao, Jiangbiao He, Vijay Bhavaraju, Mengbin Ben Yang
  • Publication number: 20160190810
    Abstract: An energy system includes renewable energy sources each including an inverter. The renewable source inverters are coupled to a distribution line in a manner wherein power combines additively. The system also includes an energy storage source including an energy storage inverter coupled to the distribution line between the point of interconnection and the renewable source inverters. Finally, a control system is structured to: (i) control a voltage at the point of interconnection by controlling a renewable source reactive power output by the renewable source inverters and an energy storage reactive power output by the energy storage inverter, and (ii) provide power ramp rate control for the renewable energy system by controlling at least one of a renewable source real power output by each of the renewable source inverters and a first energy storage real power output by the energy storage inverter.
    Type: Application
    Filed: December 30, 2014
    Publication date: June 30, 2016
    Applicant: EATON CORPORATION
    Inventors: VIJAY BHAVARAJU, QIANG FU, YAKOV L. FAMILIANT, CHRISTOPHER S. THOMPSON
  • Publication number: 20160181861
    Abstract: Power is provided from a power source and a status of the power source is signaled by controlling a waveform of an AC voltage generated from the power source. The status may include, for example, a capacity of the power source. In some embodiments, a frequency of the AC voltage may be controlled to signal the status. The power source may include, for example, an uninterruptible power supply (UPS), and signaling a status of the power source may include controlling an inverter of the UPS to signal the status. Related systems are also described.
    Type: Application
    Filed: December 19, 2014
    Publication date: June 23, 2016
    Inventors: Yakov Lvovich Familiant, Michael P. Nowak, Vijay Bhavaraju, George Arthur Navarro
  • Patent number: 9298204
    Abstract: A load control device includes an input and an output connectable to an AC source and an AC load, respectively, with one or more supply lines each corresponding to a phase in the load connecting the input and output. Line-side switches are connected between a line terminal and load terminal, and floating-neutral side switches are connected to the load terminal at one end and at a common neutral connection at another end. A controller determines a direction of current flow on each of the supply lines, determines a switching pattern for each of the line-side switches and each of the floating-neutral side switches based on the determined direction of current flow, and causes each of the line-side switches and floating-neutral side switches to operate in an On condition or an Off condition according to the determined switching pattern, such that a controlled uninterrupted current is provided to the AC load.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: March 29, 2016
    Assignee: Eaton Corporation
    Inventors: Zeljko Radomir Jankovic, Vijay Bhavaraju, Bruno Patrice-Bernard Lequesne, Yakov Lvovich Familiant
  • Patent number: 9287418
    Abstract: A system and method for selectively connecting photovoltaic (PV) arrays of a PV power system in series and parallel arrangements is disclosed. A DC-to-AC power inverter in the PV power system is electrically coupled to a plurality of PV arrays to receive a DC output therefrom and invert the DC output to an AC output, with the DC-to-AC power inverter including a DC link that receives the DC output from the plurality of PV arrays. A contactor arrangement is positioned between the plurality of PV arrays and the DC-to-AC power inverter, with the contactor arrangement including a plurality of contactors that are switchable between an on state and an off state to selectively connect the plurality of PV arrays to the DC-to-AC power inverter in a specified arrangement, so as to control a level of DC voltage received by the DC-to-AC power inverter from the plurality of PV arrays.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: March 15, 2016
    Assignee: Eaton Corporation
    Inventors: Prasanna S. Nirantare, Vijay Bhavaraju, Tiefu Zhao, Jun Xu, Christopher Scott Thompson
  • Publication number: 20150349673
    Abstract: A system and method for estimating operating characteristics of an induction motor is disclosed. The system includes a motor control device that is electrically connectable between a motor and a power source. The motor control device includes a plurality of switching devices comprising at least one thyristor corresponding to a respective phase of the motor. The motor control device also includes a controller programmed to disconnect the power source from the motor for a predetermined time period following a first plurality of cycles of a mains phase voltage of the power source. The controller is further programmed to measure a back-emf voltage during the predetermined time period, estimate an operating characteristic of the motor from the measured back-emf voltage, and trigger the plurality of switching devices to reconnect the power source to the motor following estimation of the operating characteristic.
    Type: Application
    Filed: May 30, 2014
    Publication date: December 3, 2015
    Inventors: Dongxiao Wu, Bruno Patrice-Bernard Lequesne, Yahan Hua, Vijay Bhavaraju, Kaijam M. Woodley, Steven Andrew Dimino
  • Publication number: 20150349653
    Abstract: A system and method for controlling switching in an AC-AC converter is disclosed. A controller for the AC-AC converter determines a direction of current flow on supply lines that provide AC power to the AC-AC converter and determines a switching pattern for each of a plurality of line-side switches and each of a plurality of floating-neutral side switches in the AC-AC converter based on the determined direction of current flow on each of the supply lines. The controller causes the line-side switches and the floating-neutral side switches to operate in an ON or OFF condition according to the determined switching pattern, such that a controlled current flow is output from the AC-AC converter. The controller also implements a safe-switching routine when transitioning from a first switching pattern to a second switching pattern that prevents a non-zero current from being interrupted during the transitioning between the first and second switching patterns.
    Type: Application
    Filed: May 29, 2014
    Publication date: December 3, 2015
    Applicant: Eaton Corporation
    Inventors: Bruno Patrice-Bernard Lequesne, Yakov Lvovich Familiant, Qiang Fu, Vijay Bhavaraju
  • Patent number: 9103852
    Abstract: A circuit for sensing a direct current includes a first resistance and a second resistance. A first portion of the direct current flows through the first resistance and a second portion of the direct current flows through the second resistance. The circuit further includes a current sensor having an opening, first and second conductors inductively coupled with the current sensor, and a switching circuit having a pair of switches structured to alternatingly switch in order that the second portion of the direct current alternatingly flows through the first and second conductors. The second portion of the direct current flowing through the first conductor passes through the opening of the current sensor in a first direction and the second portion of the direct current flowing through the second conductor passes through the opening of the current sensor in a second direction opposite to the first direction.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: August 11, 2015
    Assignee: EATON CORPORATION
    Inventors: Gerald Zheng, Jack Gu, Bruce Wu, Vijay Bhavaraju, Xin Zhou
  • Publication number: 20150109078
    Abstract: A circuit for sensing a direct current includes a first resistance and a second resistance. A first portion of the direct current flows through the first resistance and a second portion of the direct current flows through the second resistance. The circuit further includes a current sensor having an opening, first and second conductors inductively coupled with the current sensor, and a switching circuit having a pair of switches structured to alternatingly switch in order that the second portion of the direct current alternatingly flows through the first and second conductors. The second portion of the direct current flowing through the first conductor passes through the opening of the current sensor in a first direction and the second portion of the direct current flowing through the second conductor passes through the opening of the current sensor in a second direction opposite to the first direction.
    Type: Application
    Filed: October 22, 2013
    Publication date: April 23, 2015
    Applicant: EATON CORPORATION
    Inventors: GERALD ZHENG, JACK GU, BRUCE WU, VIJAY BHAVARAJU, XIN ZHOU
  • Patent number: 8947030
    Abstract: A load control device to control current flow to an AC load includes a circuit having line-side switches and floating-neutral side switches, along with a controller connected to the circuit that is programmed to control the circuit so as to cause each of the line-side switches and each of the floating-neutral side switches to switch between an On condition or an Off condition to selectively operate the circuit in an active mode and a free-wheeling mode. A full phase voltage is provided to the AC load during the active mode and a zero voltage is provided to the AC load during the free-wheeling mode. The controller applies a modulating function to the circuit, so as to modulate a supply voltage to control a frequency and an average of a load voltage present across terminals of the AC load, thereby enabling variable frequency operation of the AC load.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: February 3, 2015
    Assignee: Eaton Corporation
    Inventors: Yakov Lvovich Familiant, Zeljko Radomir Jankovic, Bruno Patrice-Bernard Lequesne, Vijay Bhavaraju
  • Patent number: 8884462
    Abstract: A power flow regulator includes a plurality of bi-directional DC-DC converters, each of said converters comprising a first input, a second input, a first output and a second output; and a capacitor electrically connected between the first and second inputs of each of said converters. Either the first output of each of said converters is electrically connected to a corresponding DC source and the second output of each of said converters is electrically connected to a common DC load, or the first output of each of said converters is electrically connected to a corresponding DC load and the second output of each of said converters is electrically connected to a common DC source.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: November 11, 2014
    Assignee: Eaton Corporation
    Inventors: Yu Liu, Christopher S. Thompson, Vijay Bhavaraju