Patents by Inventor Madhav Manjrekar

Madhav Manjrekar 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: 20230318408
    Abstract: Systems, components, and methods for driving a motor are disclosed, comprising: a motor including: a rotor; and a stator including a plurality of stator phase coils and a plurality of electromagnets, the plurality of electromagnets being inter-dispersed with the plurality of stator phase coils; wherein the motor is configured to produce a first plurality of motor signals. A controller, coupled to the motor to receive the first plurality of motor signals, is configured to: produce a first plurality of control signals to a drive inverter and a DC-DC converter to affect at least one phase current delivered to at least one of the plurality of stator phase coils and an at least one excitation current delivered to at least one of the plurality of electromagnets.
    Type: Application
    Filed: May 31, 2022
    Publication date: October 5, 2023
    Inventors: SOMASUNDARAM ESSAKIAPPAN, DAN M. IONEL, MURAT GURHAN KESGIN, MADHAV MANJREKAR, THOMAS M. STEPIEN
  • Publication number: 20230283083
    Abstract: An example apparatus for controlling one or more inverters is provided herein. In some embodiments, the apparatus for controlling one or more inverters may include one or more controllers. In some embodiments, each of the one or more inverters is associated with at least one power source. In some embodiments, each of the one or more controllers may configured to provide droop control, voltage magnitude control, phase control, frequency control and inertia control for an associated inverter of the one or more inverters. In some embodiments, each of the one or more controllers comprises a voltage control loop, a virtual inertia control loop, and a droop control loop enabling the power supplies to sync with a power grid and/or other power supplies when the power supply is disconnected from the power grid and/or other power supplies and/or connected to a power supply to the power grid and/or other power supplies.
    Type: Application
    Filed: February 21, 2023
    Publication date: September 7, 2023
    Inventors: Madhav MANJREKAR, Prithwiraj ROY CHOWDHURY
  • Patent number: 11218148
    Abstract: Various examples are provided related to diode clamped solid-state circuit breakers (SSCBs). Their configuration allows operation of the SSCB without dynamic voltage balancing issues. In one example, a diode clamped SSCB includes source-side switches and line-side switches connected between a DC source connection and a line-side connection. Clamping capacitors are connected at a common connection point between the source-side and line side switches and source-side and line-side clamping diodes are connected between the source-side switches and line-side switches and the clamping capacitors. Sequential switching of the source-side switches or line-side switches can avoid dynamic voltage balancing issues.
    Type: Grant
    Filed: September 4, 2020
    Date of Patent: January 4, 2022
    Assignee: University of North Carolina Charlotte
    Inventors: Madhav Manjrekar, Ehab H. Shoubaki, Tiancan Pang
  • Patent number: 10965124
    Abstract: Apparatuses including power electronics circuitry are provided. The power electronics circuitry includes at least one power converter that is coupled to a DC bus. Moreover, in some embodiments, the at least one power converter is configured to regulate a voltage of the DC bus. Related methods of operating an apparatus including power electronics circuitry are also provided.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: March 30, 2021
    Assignees: DUKE ENERGY CORPORATION, THE UNIVERSITY OF NORTH CAROLINA AT CHARLOTTE
    Inventors: Stuart Laval, Aleksandar Vukojevic, Somasundaram Essakiappan, Madhav Manjrekar, Ehab Shoubaki
  • Publication number: 20210075419
    Abstract: Various examples are provided related to diode clamped solid-state circuit breakers (SSCBs). Their configuration allows operation of the SSCB without dynamic voltage balancing issues. In one example, a diode clamped SSCB includes source-side switches and line-side switches connected between a DC source connection and a line-side connection. Clamping capacitors are connected at a common connection point between the source-side and line side switches and source-side and line-side clamping diodes are connected between the source-side switches and line-side switches and the clamping capacitors. Sequential switching of the source-side switches or line-side switches can avoid dynamic voltage balancing issues.
    Type: Application
    Filed: September 4, 2020
    Publication date: March 11, 2021
    Inventors: Madhav Manjrekar, Ehab H. Shoubaki, Tiancan Pang
  • Patent number: 10727669
    Abstract: Apparatuses including power electronics circuitry are provided. The power electronics circuitry includes at least one power converter that is coupled to a DC bus. Moreover, in some embodiments, the at least one power converter is configured to regulate a voltage of the DC bus. Related methods of operating an apparatus including power electronics circuitry are also provided.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: July 28, 2020
    Assignees: Duke Energy Corporation, The University of North Carolina at Charlotte
    Inventors: Stuart Laval, Aleksandar Vukojevic, Somasundaram Essakiappan, Madhav Manjrekar, Ehab Shoubaki
  • Patent number: 10141866
    Abstract: Various examples are directed to systems and methods for a multi-level inverter to convert direct current (DC) to alternating current (AC). The inverter may comprise first, second and third capacitors electrically coupled in series between a positive DC rail and a negative DC rail. A first pole switch bank of the inverter may comprise a plurality of first pole switches. A first pole may be electrically coupled to the first pole switch bank.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: November 27, 2018
    Assignee: THE UNIVERSITY OF NORTH CAROLINA AT CHARLOTTE
    Inventor: Madhav Manjrekar
  • Publication number: 20180219381
    Abstract: Apparatuses including power electronics circuitry are provided. The power electronics circuitry includes at least one power converter that is coupled to a DC bus. Moreover, in some embodiments, the at least one power converter is configured to regulate a voltage of the DC bus. Related methods of operating an apparatus including power electronics circuitry are also provided.
    Type: Application
    Filed: January 26, 2018
    Publication date: August 2, 2018
    Inventors: Stuart Laval, Aleksandar Vukojevic, Somasundaram Essakiappan, Madhav Manjrekar, Ehab Shoubaki
  • Publication number: 20180219377
    Abstract: Apparatuses including power electronics circuitry are provided. The power electronics circuitry includes at least one power converter that is coupled to a DC bus. Moreover, in some embodiments, the at least one power converter is configured to regulate a voltage of the DC bus. Related methods of operating an apparatus including power electronics circuitry are also provided.
    Type: Application
    Filed: January 26, 2018
    Publication date: August 2, 2018
    Inventors: Stuart Laval, Aleksandar Vukojevic, Somasundaram Essakiappan, Madhav Manjrekar, Ehab Shoubaki
  • Patent number: 9887550
    Abstract: Methods and systems relating to a control system for an electrical energy outputting device are provided. The method may include receiving voltages from a plurality of power devices connected to a controller; identifying, by the controller in real time, relative levels of voltages output from each power devices; generating, by the system in real time, a waveform for each respective voltage of the power devices so that, for each cycle, power extracted from each generated waveform over a single waveform cycle is based the relative levels of voltages from each respective power device and so that the power level, for each cycle, from each waveform is higher than the power level of the other generated waveforms that have lower voltages; and summing, in real time, the generated waveforms to form an AC waveform.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: February 6, 2018
    Assignee: THE UNIVERSITY OF NORTH CAROLINA AT CHARLOTTE
    Inventor: Madhav Manjrekar
  • Publication number: 20170250624
    Abstract: Various examples are directed to systems and methods for a multi-level inverter to convert direct current (DC) to alternating current (AC). The inverter may comprise first, second and third capacitors electrically coupled in series between a positive DC rail and a negative DC rail. A first pole switch bank of the inverter may comprise a plurality of first pole switches. A first pole may be electrically coupled to the first pole switch bank.
    Type: Application
    Filed: September 11, 2015
    Publication date: August 31, 2017
    Applicant: The University of North Carolina at Charlotte
    Inventor: Madhav Manjrekar
  • Publication number: 20160276837
    Abstract: Methods and systems relating to a control system for an electrical energy outputting device are provided. The method may include receiving voltages from a plurality of power devices connected to a controller; identifying, by the controller in real time, relative levels of voltages output from each power devices; generating, by the system in real time, a waveform for each respective voltage of the power devices so that, for each cycle, power extracted from each generated waveform over a single waveform cycle is based the relative levels of voltages from each respective power device and so that the power level, for each cycle, from each waveform is higher than the power level of the other generated waveforms that have lower voltages; and summing, in real time, the generated waveforms to form an AC waveform.
    Type: Application
    Filed: November 7, 2014
    Publication date: September 22, 2016
    Applicant: THE UNIVERSITY OF NORTH CAROLINA AT CHARLOTTE
    Inventor: Madhav MANJREKAR
  • Patent number: 9009956
    Abstract: Systems and methods are described that provide multilevel inverters having a plurality of levels using a simplified topology. For single phase systems, embodiments provide a full-bridge topology using bidirectional switching interconnections.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: April 21, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventors: Yaosuo Xue, Madhav Manjrekar
  • Publication number: 20140001887
    Abstract: A system for at least one virtual power apparatus includes a first virtual power apparatus that includes a first port configured to receive a first power signal, a second port configured to provide a second power signal, and a power system controller communicatively connected to a power device. The power system controller is configured to receive an image of an electric power solution, wherein the image comprises instructions for deriving the second power signal by altering and routing the first power signal, process the image by converting the image instructions into commands understandable by the power device, and send the commands to the power device for realizing the image in the power device. The power device is configured to receive the command for realizing the image, derive the second power signal, and provide the second power signal to the second port.
    Type: Application
    Filed: January 7, 2013
    Publication date: January 2, 2014
    Applicant: Virtual Power Systems Inc.
    Inventors: Shankar Ramamurthy, Madhav Manjrekar, Steven Uhlir
  • Publication number: 20130014384
    Abstract: Systems and methods are described that provide multilevel inverters having a plurality of levels using a simplified topology. For single phase systems, embodiments provide a full-bridge topology using bidirectional switching interconnections.
    Type: Application
    Filed: February 15, 2011
    Publication date: January 17, 2013
    Applicant: Siemins Corporation
    Inventors: Yaosuo Xue, Madhav Manjrekar
  • Publication number: 20070007968
    Abstract: A system for monitoring an electrical power system includes one or more transducer units, each of which has a current measuring device and a voltage measuring device coupled to a respective one of the phase conductors of the power system, and a transducer wireless communications device. The transducer wireless communications device of each transducer unit transmits the measured current data and voltage data to a base unit. The base unit generates one or more electrical parameters relating to the power system using the received current data and voltage data. Also, a method of monitoring a power system including generating current and voltage data for each phase conductor at a first location, wirelessly transmitting the current and voltage data to a second location, and generating at the second location electrical parameters relating to the power system using the current and voltage data for each phase conductor.
    Type: Application
    Filed: July 8, 2005
    Publication date: January 11, 2007
    Inventors: William Mauney, Madhav Manjrekar
  • Patent number: 6512349
    Abstract: A method is specified for operating a charger (1) for a voltage-maintaining device (2), in which a rectifier (5), connected to phase inputs (PA, PB; PC) via a transformer (3) with an electric AC voltage supply system (4), of the charger (1) is driven by means of a drive signal (S) formed from reference charging voltages (ULA, ref; ULB, ref; ULC, ref). Furthermore, a charging voltage (ULA; ULB; ULC) for the corresponding phase (A; B; C) is generated at each phase input (PA; PB; PC) a substantially constant DC voltage (UDC) being generated-on the DC voltage side of the rectifier (5). Each charging voltage (ULA; ULB; ULC) is generated in such a way that in the corresponding phase (A; B; C) a charging current (ILA; ILB; ILC) is injected in a fashion substantially proportional to a phase system voltage (UNA; UNB; UNC) of the corresponding phase (A; B; C) of the electric AC voltage supply system (3). An apparatus for carrying out the method is also disclosed.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: January 28, 2003
    Assignee: ABB Schweiz AG
    Inventors: Bilal Gerhard, John Daniel, Madhav Manjrekar
  • Patent number: 6462518
    Abstract: A converter circuit is specified for voltage maintenance in an electrical AC supply network (1), with the electrical AC supply network (1) having an associated voltage source (UR; US; UT) for each phase (R; S; T) for supplying an electrical load (2), with the converter circuit having a respective inverter (3) for each phase (R; S; T), which inverter (3) is connected on the DC side via an energy-storage capacitor (4) to a supply device (5). On the AC side, each inverter (3) is connected in series between the associated voltage source (UR; US; UT) and the electrical load (2) in the respective phase (R; S; T), and in that, on the AC side, the supply device (5) is connected to at least two phases (R; S; T) between the associated voltage sources (UR; US; UT) and the respective inverters (3).
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: October 8, 2002
    Assignee: ABB Schweiz AG
    Inventors: Philippe Fischer, John Daniel, Philippe Maibach, Madhav Manjrekar