Patents by Inventor Ramanujam Ramabhadran
Ramanujam Ramabhadran 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).
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Patent number: 11887766Abstract: A component includes a magnetic core having a body formed of a first material, defining a first opening and a second opening thereon. A duct formed of a second material extends at least partially through the body between the first opening and the second opening. The first opening and the second opening are in fluid communication by way of the duct.Type: GrantFiled: August 24, 2020Date of Patent: January 30, 2024Assignee: GE Aviation Systems LLCInventors: Ramanujam Ramabhadran, Ruxi Wang, Juan Manuel Rivas Davila, Jiale Xu
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Patent number: 11804771Abstract: A customizable power conversion system (1000) is configured to operate with multiple alternating current (AC) and direct current (DC) power sources (1001,1003) and supplies multiple AC and DC loads (1018,1020,1022,1024). The customizable power conversion system is also configured to be assembled from a plurality of customizable power converters (1004,1006,1008,1010,1012), each of which is configured to function as a building block of the customizable power conversion system. More particularly, each customizable power converter may be configured as any DC/DC, DC/AC, AC/DC, or AC/AC converter, such as any of i) an inverter, ii) a DC/DC converter for use with a photovoltaic (PV) array (or string of PV arrays), and iii) a DC/DC converter for use with an energy storage element (e.g., a battery or battery string).Type: GrantFiled: March 15, 2019Date of Patent: October 31, 2023Assignee: General Electric CompanyInventors: Zheyu Zhang, Ramanujam Ramabhadran, Douglas Carl Hofer, Ahmed Elasser
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Patent number: 11529803Abstract: A system includes a magnetic material supply for regulating a magnetic material flow rate of a magnetic material and a binder material supply for regulating a binder material flow rate of a binder material. A nozzle is configured for depositing a deposition mixture of the magnetic material and the binder material on a surface and a preheater is configured to preheat the deposition mixture before depositing on the surface. A controller is in operative communication with the magnetic material supply, the binder material supply, and the preheater. The controller is configured to receive an inductor core design file that represents a geometry and a magnetic permeability distribution of an inductor core, move the nozzle to one or more deposition locations, and adjust the magnetic material flow rate to the binder material flow rate to achieve a deposition mixture having a desired magnetic permeability at the deposition locations.Type: GrantFiled: December 11, 2019Date of Patent: December 20, 2022Assignee: General Electric CompanyInventors: Ruxi Wang, Manoj Ramprasad Shah, Ramanujam Ramabhadran, Yanzhe Yang
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Publication number: 20220311337Abstract: A multilevel converter system is provided. The system includes a converter and a converter controller interfaced with the converter. The converter controller includes a voltage loop, a current loop, and a voltage compensation loop. The voltage loop is configured to receive first and second voltages from the first and second segments of the converter and a reference voltage. The current loop is configured to receive a current output of the converter, a reference current, and a balancing reference current. The voltage compensation loop is configured to receive the first and second voltages and a sign signal. The converter controller is configured to generate first and second pulse-width modulation (PWM) signals using output signals from the current loop and the output compensation signals from the voltage compensation loop. The PWM signals are configured to control the switches of the converter and to balance the first voltage with the second voltage.Type: ApplicationFiled: June 17, 2019Publication date: September 29, 2022Inventors: Zheyu Zhang, Tomas Sadilek, Ramanujam Ramabhadran, Hao Tu
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Patent number: 11381236Abstract: Aspects of the present disclosure are directed toward designs and methods of improving driving of switching devices. One proposed solution to improving driving of switching devices is an auxiliary control circuit that selectively guides the switching device through at least one switching region, permitting an improved operation of the switching device.Type: GrantFiled: January 13, 2021Date of Patent: July 5, 2022Assignee: GENERAL ELECTRIC COMPANYInventors: Ramanujam Ramabhadran, Krishna Mainali, Kum-Kang Huh, Maja Harfman-Todorovic, Robert James Thomas, Cong Li
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Publication number: 20220158540Abstract: A customizable power conversion system (1000) is configured to operate with multiple alternating current (AC) and direct current (DC) power sources (1001,1003) and supplies multiple AC and DC loads (1018,1020,1022,1024). The customizable power conversion system is also configured to be assembled from a plurality of customizable power converters (1004,1006,1008,1010,1012), each of which is configured to function as a building block of the customizable power conversion system. More particularly, each customizable power converter may be configured as any DC/DC, DC/AC, AC/DC, or AC/AC converter, such as any of i) an inverter, ii) a DC/DC converter for use with a photovoltaic (PV) array (or string of PV arrays), and iii) a DC/DC converter for use with an energy storage element (e.g., a battery or battery string).Type: ApplicationFiled: March 15, 2019Publication date: May 19, 2022Inventors: Zheyu Zhang, Ramanujam Ramabhadran, Douglas Carl Hofer, Ahmed Elasser
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Publication number: 20220059272Abstract: A component includes a magnetic core having a body formed of a first material, defining a first opening and a second opening thereon. A duct formed of a second material extends at least partially through the body between the first opening and the second opening. The first opening and the second opening are in fluid communication by way of the duct.Type: ApplicationFiled: August 24, 2020Publication date: February 24, 2022Inventors: Ramanujam Ramabhadran, Ruxi Wang, Juan Manuel Rivas Davila, Jiale Xu
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Patent number: 11196278Abstract: Controlling an energy storage system includes providing one or more constraints to an optimization problem algorithm, determining by the optimization problem algorithm a DC bus voltage value that results in an minimum total power dissipation for the plurality of power converters, calculating a respective control variable for each of the respective plurality of power converters based on the determined DC bus voltage value, and generating control processor executable instructions to implement control of each of the plurality of power converters to achieve the calculated respective control variable. A system for implementing the method and a non-transitory computer-readable medium are also disclosed.Type: GrantFiled: May 30, 2018Date of Patent: December 7, 2021Assignee: General Electric CompanyInventors: Mohammed Agamy, Ramanujam Ramabhadran, Kenneth McClellan Rush, Luca Tonini, Ahmed Elasser, Herman Lucas Norbert Wiegman
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Publication number: 20210159715Abstract: Controlling an energy storage system includes providing one or more constraints to an optimization problem algorithm, determining by the optimization problem algorithm a DC bus voltage value that results in an minimum total power dissipation for the plurality of power converters, calculating a respective control variable for each of the respective plurality of power converters based on the determined DC bus voltage value, and generating control processor executable instructions to implement control of each of the plurality of power converters to achieve the calculated respective control variable. A system for implementing the method and a non-transitory computer-readable medium are also disclosed.Type: ApplicationFiled: May 30, 2018Publication date: May 27, 2021Inventors: Mohammed AGAMY, Ramanujam RAMABHADRAN, Kenneth McClellan RUSH, Luca TONINI, Ahmed ELASSER, Herman Lucas Norbert WIEGMAN
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Publication number: 20210135667Abstract: Aspects of the present disclosure are directed toward designs and methods of improving driving of switching devices. One proposed solution to improving driving of switching devices is an auxiliary control circuit that selectively guides the switching device through at least one switching region, permitting an improved operation of the switching device.Type: ApplicationFiled: January 13, 2021Publication date: May 6, 2021Inventors: Ramanujam Ramabhadran, Krishna Mainali, Kum-Kang Huh, Maja Harfman-Todorovic, Robert James Thomas, Cong Li
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Patent number: 10995672Abstract: The present disclosure relates to gas turbine engine operation in which an igniter assembly is provided with an electrical energy input (e.g., an electrical waveform) that is configured to increase a likelihood of igniting a fuel-air mixture surrounding the igniter assembly. In certain embodiments, the igniter assembly is supplied with an augmented electrical waveform that may reduce a quantity of sparks generated by the igniter assembly before successful light-off (e.g., ignition) of the fuel-air mixture is achieved (e.g., as compared to a quantity of sparks generated to achieve ignition by an igniter assembly that receives an electrical energy input in the form of a conventional electrical waveform). Accordingly, the augmented electrical waveform may reduce wear (e.g., via oxidation) on electrodes of the igniter assembly, such as a primary electrode (e.g., a center electrode) and a secondary electrode (e.g., an outer shell electrode) disposed about the primary electrode.Type: GrantFiled: July 12, 2018Date of Patent: May 4, 2021Assignee: General Electric CompanyInventors: Badri Narayan Ramamurthi, Karim Younsi, Andrey Meshkov, Jason Fredrick Trotter, Timothy John Sommerer, Ramanujam Ramabhadran, Alvaro Alexander Briceno, Charles Cook, Mark Wayne McWaters
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Patent number: 10924106Abstract: Aspects of the present disclosure are directed toward designs and methods of improving driving of switching devices. One proposed solution to improving driving of switching devices is an auxiliary control circuit that selectively guides the switching device through at least one switching region, permitting an improved operation of the switching device.Type: GrantFiled: January 2, 2019Date of Patent: February 16, 2021Assignee: GENERAL ELECTRIC COMPANYInventors: Ramanujam Ramabhadran, Krishna Mainali, Kum-Kang Huh, Maja Harfman-Todorovic, Robert James Thomas, Cong Li
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Patent number: 10770382Abstract: A modular electronics package is disclosed that includes a first and second electronics packages, with each of the first and second electronics packages including a metallized insulating substrate and a solid-state switching device positioned on the metallized insulating substrate, the solid-state switching device comprising a plurality of contact pads electrically coupled to the first conductor layer of the metallized insulating substrate. A conductive joining material is positioned between the first electronics package and the second electronics package to electrically connect them together. The first electronics package and the second electronics package are stacked with one another to form a half-bridge unit cell, with the half-bridge unit cell having a current path through the solid-state switching device in the first electronics package and a close coupled return current path through the solid-state switching device in the second electronics package in opposite flow directions.Type: GrantFiled: November 29, 2018Date of Patent: September 8, 2020Assignee: General Electric CompanyInventors: Christopher James Kapusta, Ramanujam Ramabhadran, Kum-Kang Huh, Brian Lynn Rowden, Glenn Scott Claydon, Ahmed Elasser
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Publication number: 20200212909Abstract: Aspects of the present disclosure are directed toward designs and methods of improving driving of switching devices. One proposed solution to improving driving of switching devices is an auxiliary control circuit that selectively guides the switching device through at least one switching region, permitting an improved operation of the switching device.Type: ApplicationFiled: January 2, 2019Publication date: July 2, 2020Inventors: Ramanujam Ramabhadran, Krishna Mainali, Kum-Kang Huh, Maja Harfman-Todorovic, Robert James Thomas, Cong Li
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Publication number: 20200176360Abstract: A modular electronics package is disclosed that includes a first and second electronics packages, with each of the first and second electronics packages including a metallized insulating substrate and a solid-state switching device positioned on the metallized insulating substrate, the solid-state switching device comprising a plurality of contact pads electrically coupled to the first conductor layer of the metallized insulating substrate. A conductive joining material is positioned between the first electronics package and the second electronics package to electrically connect them together. The first electronics package and the second electronics package are stacked with one another to form a half-bridge unit cell, with the half-bridge unit cell having a current path through the solid-state switching device in the first electronics package and a close coupled return current path through the solid-state switching device in the second electronics package in opposite flow directions.Type: ApplicationFiled: November 29, 2018Publication date: June 4, 2020Inventors: Christopher James Kapusta, Ramanujam Ramabhadran, Kum-Kang Huh, Brian Lynn Rowden, Glenn Scott Claydon, Ahmed Elasser
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Publication number: 20200114640Abstract: A core includes a first layer, a second layer, and a third layer. The first layer has a first surface, a second surface, and a first recessed pattern extending from the second surface of the first layer toward the first surface of the first layer. The second layer has a third surface, a fourth surface, a second recessed pattern extending from the third surface of the second layer toward the fourth surface of the second layer, and a third recessed pattern extending from the fourth surface of the second layer toward the third surface of the second layer. The third layer has a fifth surface, a sixth surface, and a fourth recessed pattern extending from the fifth surface of the third layer toward the sixth surface of the third layer. The second layer is disposed between the first and third layers such that the second surface of the first layer faces the third surface of the second layer and the fourth surface of the second layer faces the fifth surface of the third layer.Type: ApplicationFiled: December 11, 2019Publication date: April 16, 2020Inventors: Ruxi Wang, Manoj Ramprasad Shah, Ramanujam Ramabhadran, Yanzhe Yang
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Patent number: 10574144Abstract: According to various embodiments, a DC/DC conversion system is disclosed. The DC/DC conversion system includes a boost converter coupled to a plurality of parallel buck converters. The boost converter and plurality of buck converters each include an inductor, where the inductors are magnetically coupled to each other. The DC/DC conversion system further includes a control system configured to control the boost converter and plurality of buck converters such that combined duty cycles of the plurality of buck converters are about equal to a duty cycle of the boost converter and the duty cycles of the plurality of buck converters are modulated out of phase.Type: GrantFiled: September 28, 2018Date of Patent: February 25, 2020Assignee: GENERAL ELECTRIC COMPANYInventors: Ramanujam Ramabhadran, Kum-Kang Huh, Mohammed Agamy, Ahmed Elasser
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Publication number: 20200018239Abstract: The present disclosure relates to gas turbine engine operation in which an igniter assembly is provided with an electrical energy input (e.g., an electrical waveform) that is configured to increase a likelihood of igniting a fuel-air mixture surrounding the igniter assembly. In certain embodiments, the igniter assembly is supplied with an augmented electrical waveform that may reduce a quantity of sparks generated by the igniter assembly before successful light-off (e.g., ignition) of the fuel-air mixture is achieved (e.g., as compared to a quantity of sparks generated to achieve ignition by an igniter assembly that receives an electrical energy input in the form of a conventional electrical waveform). Accordingly, the augmented electrical waveform may reduce wear (e.g., via oxidation) on electrodes of the igniter assembly, such as a primary electrode (e.g., a center electrode) and a secondary electrode (e.g., an outer shell electrode) disposed about the primary electrode.Type: ApplicationFiled: July 12, 2018Publication date: January 16, 2020Inventors: Badri Narayan Ramamurthi, Karim Younsi, Andrey Meshkov, Jason Fredrick Trotter, Timothy John Sommerer, Ramanujam Ramabhadran, Alvaro Alexander Briceno, Charles Cook, Mark Wayne McWaters
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Patent number: 10525690Abstract: A method of manufacturing an inductor core includes controlling a flow of magnetic material and a flow of binder material to a nozzle such that the flow magnetic material merges with the flow of binder material at a focal point of a preheater, preheating the magnetic material and the binder material by energizing the preheater, mixing the magnetic material and the binder material according to a ratio based on a magnetic permeability distribution of the inductor core, and depositing the magnetic material and the binder material on a surface to form the inductor core having three layers with recessed patterns defined between the layers for receiving a coil.Type: GrantFiled: September 7, 2016Date of Patent: January 7, 2020Assignee: GENERAL ELECTRIC COMPANYInventors: Ruxi Wang, Manoj Ramprasad Shah, Ramanujam Ramabhadran, Yanzhe Yang
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Patent number: 10491096Abstract: A power electronics circuit is disclosed that includes a switching circuit comprising a first solid-state device coupled in series with a second solid-state device, with at least the first solid-state device comprising a solid-state switch having a gate terminal. The power electronics circuit also includes a current sense transformer positioned between the first and second solid-state devices and configured to sense a current flowing on a conductive trace connecting the first and second solid-state devices, and a controller coupled to the switching circuit and the current sense transformer so as to be in operable communication therewith. The controller is programmed to receive a current sense signal from the current sense transformer indicative of the current flowing on the conductive trace and modulate a gate voltage to the gate terminal of the first solid-state device based on the received current sense signal, so as to control switching thereof.Type: GrantFiled: August 22, 2017Date of Patent: November 26, 2019Assignee: General Electric CompanyInventors: Ramanujam Ramabhadran, Robert James Thomas, Ahmed Elasser