Patents by Inventor Maja Harfman Todorovic
Maja Harfman Todorovic 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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Publication number: 20180123334Abstract: An electrical system includes a power electronics system and a bus bar coupled to the power electronic system. The power electronics system includes a switching device configured to selectively connect and disconnect. The bus bar includes a first conductive layer and a second conductive layer. The first conductive layer is disposed directly adjacent a first insulation layer, wherein the first conductive layer is configured to conduct a first polarity of electrical power to, from, or both the power electronics system. The second conductive layer is disposed directly adjacent the first insulation layer, and is configured to conduct a second polarity of electrical power opposite the first polarity to, from, or both the power electronics system. The first conductive layer comprises a first thickness half a second thickness of the second conductive layer.Type: ApplicationFiled: October 27, 2016Publication date: May 3, 2018Inventors: Xu She, Rajib Datta, Ravisekhar Nadimpalli Raju, Maja Harfman-Todorovic, Philip Michael Cioffi
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Patent number: 9893678Abstract: An alternating current (AC) harness for a photovoltaic (PV) system includes a wire assembly having a first end and a second end, the wire assembly having a plurality of lead wires, and at least one AC connection module positioned at a location along a length of the wire assembly between the first end and the second end. Further, the at least one AC connection module includes a first connection terminal electrically coupled to the plurality of lead wires of the wire assembly and constructed to electrically couple the wire assembly with an output of a first PV module of the PV system. The at least one AC connection module also includes a second connection terminal electrically coupled to the plurality of lead wires of the wire assembly and constructed to electrically couple the wire assembly with an output of a second PV module of the PV system.Type: GrantFiled: October 16, 2013Date of Patent: February 13, 2018Assignee: General Electric CompanyInventors: Philip Michael Cioffi, Maja Harfman Todorovic, Michael Scott Herzog, Charles Steven Korman, Donald M. Doherty, Neil Anthony Johnson
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Publication number: 20170366006Abstract: A system and method for conditioning DC power received from hybrid DC power sources is disclosed. A power conversion circuit is coupled to a respective DC power source to selectively condition the output power generated thereby to a DC bus voltage. The power conversion circuit includes a switch arrangement and capacitors arranged to provide a charge balancing in the power conversion circuit. A controller in operable communication with the switch arrangement receives inputs on a DC bus voltage and at least one parameter related to operation of the DC power source, and determines an adjustable voltage to be output from the conversion circuit to the DC bus based on the received inputs. The controller then selectively controls operation of the switch arrangement in order to generate the determined adjustable voltage.Type: ApplicationFiled: August 10, 2017Publication date: December 21, 2017Inventors: Fengfeng Tao, Ahmed Elasser, Song Chi, Maja Harfman Todorovic
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Publication number: 20170264239Abstract: A micro-inverter assembly for use in a photovoltaic system includes a housing, a direct current (DC)-to-alternating current (AC) micro-inverter disposed within the housing, and a DC connector electrically coupled to the DC-to-AC micro-inverter. The DC connector is positioned within a recess formed in a bottom surface of the housing such that at least one electrical contact of the DC connector is accessible from outside the housing. According to alternative embodiments, the DC connector comprises a plug-and-play connector constructed for one of a rotational engagement and a translational engagement with a DC connector of a photovoltaic (PV) panel.Type: ApplicationFiled: May 24, 2017Publication date: September 14, 2017Inventors: Philip Michael Cioffi, Maja Harfman Todorovic, Michael Scott Herzog, Charles Steven Korman, Donald M. Doherty, Neil Anthony Johnson
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Patent number: 9748767Abstract: A system and method for conditioning DC power received from hybrid DC power sources is disclosed. A power conversion circuit is coupled to a respective DC power source to selectively condition the output power generated thereby to a DC bus voltage. The power conversion circuit includes a switch arrangement and capacitors arranged to provide a charge balancing in the power conversion circuit. A controller in operable communication with the switch arrangement receives inputs on a DC bus voltage and at least one parameter related to operation of the DC power source, and determines an adjustable voltage to be output from the conversion circuit to the DC bus based on the received inputs. The controller then selectively controls operation of the switch arrangement in order to generate the determined adjustable voltage.Type: GrantFiled: April 25, 2014Date of Patent: August 29, 2017Assignee: General Electric CompanyInventors: Fengfeng Tao, Ahmed Elasser, Song Chi, Maja Harfman Todorovic
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Patent number: 9722595Abstract: A system includes a SiC semiconductor power device; a power supply board that is configured to provide power to a first gate driver board via a connector; the first gate driver board that is coupled and configured to provide current to the SiC semiconductor power device, wherein the first gate driver board is coupled to the power supply board via the connector, and wherein the first gate driver board is separated from the power supply board; and an interconnect board that is coupled to the first gate driver board, wherein the interconnect board is configured to couple the first gate driver board a second gate driver board.Type: GrantFiled: December 29, 2015Date of Patent: August 1, 2017Assignee: GENERAL ELECTRIC COMPANYInventors: Fengfeng Tao, Michael Joseph Schutten, Jeffrey Joseph Nasadoski, Maja Harfman-Todorovic, John Stanley Glaser
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Patent number: 9705422Abstract: A power inversion system includes an input and output coupleable to a DC power and an AC load, respectively, and a power inverter including a plurality of phase legs each having two bridge legs coupled in parallel with at least two switch and antiparallel diode pairs coupled in series. The system also includes a plurality of inductors, with at least one inductor coupled between a midpoint of each bridge leg and an LCL filter, the inductors in each phase leg being magnetically coupled. The system further includes a control system to drive the power inverter in a soft switching configuration, the control system programmed to output a switching signal to the power inverter according to a duty cycle and a phase shift angle, determine a value of the duty cycle, and optimize the phase shift angle of the power inverter based on the value of the duty cycle.Type: GrantFiled: May 27, 2015Date of Patent: July 11, 2017Assignee: General Electric CompanyInventors: Xiaohu Liu, Luis Jose Garces, Maja Harfman Todorovic, Mohammed Agamy
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Publication number: 20170187369Abstract: A system includes a SiC semiconductor power device; a power supply board that is configured to provide power to a first gate driver board via a connector; the first gate driver board that is coupled and configured to provide current to the SiC semiconductor power device, wherein the first gate driver board is coupled to the power supply board via the connector, and wherein the first gate driver board is separated from the power supply board; and an interconnect board that is coupled to the first gate driver board, wherein the interconnect board is configured to couple the first gate driver board a second gate driver board.Type: ApplicationFiled: December 29, 2015Publication date: June 29, 2017Inventors: Fengfeng Tao, Michael Joseph Schutten, Jeffrey Joseph Nasadoski, Maja Harfman-Todorovic, John Stanley Glaser
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Patent number: 9685904Abstract: A micro-inverter assembly includes a housing having an opening formed in a bottom surface thereof, and a direct current (DC)-to-alternating current (AC) micro-inverter disposed within the housing at a position adjacent to the opening. The micro-inverter assembly further includes a micro-inverter DC connector electrically coupled to the DC-to-AC micro-inverter and positioned within the opening of the housing, the micro-inverter DC connector having a plurality of exposed electrical contacts.Type: GrantFiled: October 16, 2013Date of Patent: June 20, 2017Assignee: General Electric CompanyInventors: Philip Michael Cioffi, Maja Harfman Todorovic, Michael Scott Herzog, Charles Steven Korman, Donald M. Doherty, Neil Anthony Johnson
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Patent number: 9595888Abstract: A power converter is provided. The power converter includes a converter leg including switches for converting power. The power converter also includes a controller for switching the switches using a pulse width modulation technique. The power converter further includes an interface inductor coupled to the converter leg for avoiding a reverse recovery of current in the switches during operation.Type: GrantFiled: November 29, 2012Date of Patent: March 14, 2017Assignee: General Electric CompanyInventors: Fengfeng Tao, Maja Harfman Todorovic, Luis Jose Garces, Rui Zhou, Donald Gene Marabell, Robert Louis Steigerwald
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Publication number: 20160352253Abstract: A power inversion system includes an input and output coupleable to a DC power and an AC load, respectively, and a power inverter including a plurality of phase legs each having two bridge legs coupled in parallel with at least two switch and antiparallel diode pairs coupled in series. The system also includes a plurality of inductors, with at least one inductor coupled between a midpoint of each bridge leg and an LCL filter, the inductors in each phase leg being magnetically coupled. The system further includes a control system to drive the power inverter in a soft switching configuration, the control system programmed to output a switching signal to the power inverter according to a duty cycle and a phase shift angle, determine a value of the duty cycle, and optimize the phase shift angle of the power inverter based on the value of the duty cycle.Type: ApplicationFiled: May 27, 2015Publication date: December 1, 2016Inventors: Xiaohu Liu, Luis Jose Garces, Maja Harfman Todorovic, Mohammed Agamy
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Patent number: 9504135Abstract: An apparatus and method for magnetic control of an electron beam includes a control circuit having a first low voltage source and a second low voltage source. The control circuit also includes a first switching device coupled in series with the first low voltage source and configured to create a first current path with the first low voltage source when in a closed position and a second switching device coupled in series with the second low voltage source and configured to create a second current path with the second low voltage source when in a closed position. The control circuit further includes a capacitor coupled in parallel with an electron beam manipulation coil and positioned along the first and second current paths and a current source circuit electrically coupled to the electron beam manipulation coil and constructed to generate an offset current in the first and second current paths.Type: GrantFiled: July 28, 2010Date of Patent: November 22, 2016Assignee: General Electric CompanyInventors: Antonio Caiafa, Maja Harfman Todorovic, Joseph Leclaire Reynolds
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Patent number: 9496702Abstract: A method and a high-voltage DC (HVDC) power system are provided. The system includes a plurality of sending-end (SE) modules coupled in electrical series and divided into at least two groups that each operate independently with respect to an electrical ground and a plurality of receiving-end (RE) power converter modules electrically coupled to the plurality of SE modules, the plurality of RE power converter modules including a fast ground-fault detection and control device, the plurality of RE power converter modules including a receiving-end front-end DC-DC converter controller, and an output current damping control.Type: GrantFiled: July 15, 2013Date of Patent: November 15, 2016Assignee: General Electric CompanyInventors: Dong Dong, Luis Jose Garces, Rixin Lai, Song Chi, Maja Harfman Todorovic, Di Zhang
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Publication number: 20150311708Abstract: A system and method for conditioning DC power received from hybrid DC power sources is disclosed. A power conversion circuit is coupled to a respective DC power source to selectively condition the output power generated thereby to a DC bus voltage. The power conversion circuit includes a switch arrangement and capacitors arranged to provide a charge balancing in the power conversion circuit. A controller in operable communication with the switch arrangement receives inputs on a DC bus voltage and at least one parameter related to operation of the DC power source, and determines an adjustable voltage to be output from the conversion circuit to the DC bus based on the received inputs. The controller then selectively controls operation of the switch arrangement in order to generate the determined adjustable voltage.Type: ApplicationFiled: April 25, 2014Publication date: October 29, 2015Applicant: General Electric CompanyInventors: Fengfeng Tao, Ahmed Elasser, Song Chi, Maja Harfman Todorovic
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Methods for locating ground faults and insulation degradation condition in energy conversion systems
Patent number: 9103865Abstract: Methods for determining a ground fault or insulation degradation condition within energy conversion systems are described. A method for determining a ground fault within an energy conversion system may include, in part, a comparison of baseline waveform of differential current to a waveform of differential current during operation for a plurality of DC current carrying conductors in an energy conversion system. A method for determining insulation degradation within an energy conversion system may include, in part, a comparison of baseline frequency spectra of differential current to a frequency spectra of differential current transient at start-up for a plurality of DC current carrying conductors in an energy conversion system. In one embodiment, the energy conversion system may be a photovoltaic system.Type: GrantFiled: December 26, 2012Date of Patent: August 11, 2015Assignee: General Electric CompanyInventors: Mohamed Agamy, Ahmed Elasser, Anthony William Galbraith, Maja Harfman Todorovic -
Patent number: 9076607Abstract: A system that includes micro-electromechanical system switching circuitry is provided. The system may include a first over-current protection circuitry connected in a parallel circuit with the micro-electromechanical system switching circuitry for suppressing a voltage level across contacts of the micro-electromechanical system switching circuitry during a first switching event, such as a turn-on event. The system may further include a second over-current protection circuitry connected in a parallel circuit with the micro-electromechanical system switching circuitry for suppressing a current flow through the contacts of the micro-electromechanical system switching circuitry during a second switching event, such as a turn-off event.Type: GrantFiled: October 3, 2007Date of Patent: July 7, 2015Assignee: General Electric CompanyInventors: William James Premerlani, Kanakasabapathi Subramanian, Kathleen Ann O'Brien, John Norton Park, Owen Jannis Schelenz, Maja Harfman Todorovic
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Publication number: 20150138859Abstract: A power conversion system is presented. The power conversion system includes a power converter. The power converter includes at least two circuits, where each of the at least two circuits includes two or more phase legs, where each of the two or more phase legs includes at least two semiconductor switches. Also, the at least two circuits includes an interphase reactor configured to couple one of the two or more phase legs to at least one other phase leg in the two or more phase legs. Moreover, the power conversion system includes a controller configured to obtain a switching pattern for each of the at least two semiconductor switches of the at least two circuits and selectively switch each of the at least two semiconductor switches based on the obtained switching pattern to reduce a common mode signal in the power conversion system. Method for power conversion is also presented.Type: ApplicationFiled: November 15, 2013Publication date: May 21, 2015Applicant: General Electric CompanyInventors: Rui Zhou, Luis Jose Garces, Fengfeng Tao, Maja Harfman Todorovic, Charles Michael Stephens, Lei Wang
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Publication number: 20150131328Abstract: A power conversion system is presented. The system includes a power source coupled to a power converter and a controller. The controller is configured to determine a value of at least one parameter corresponding to the power source. Additionally, the controller is configured to provide a first portion of the at least one parameter to the power converter and modify an operating frequency of the power converter, duty ratio of the power converter, or a combination thereof. Furthermore, the controller is configured to obtain an electrical quantity at an output of the power converter based on the modified operating frequency, the modified duty ratio, or a combination thereof. Also, the controller is configured to deliver a combination of the electrical quantity obtained at the output of the power converter and a second portion of the at least one parameter to a load. Method for converting power is also presented.Type: ApplicationFiled: November 8, 2013Publication date: May 14, 2015Applicant: General Eectric CompanyInventors: Fengfeng Tao, Michael Joseph Schutten, Eladio Clemente Delgado, Luis Jose Garces, Rui Zhou, Xinhui Wu, Maja Harfman Todorovic, Lei Wang
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Publication number: 20150103497Abstract: An alternating current (AC) harness for a photovoltaic (PV) system includes a wire assembly having a first end and a second end, the wire assembly having a plurality of lead wires, and at least one AC connection module positioned at a location along a length of the wire assembly between the first end and the second end. Further, the at least one AC connection module includes a first connection terminal electrically coupled to the plurality of lead wires of the wire assembly and constructed to electrically couple the wire assembly with an output of a first PV module of the PV system. The at least one AC connection module also includes a second connection terminal electrically coupled to the plurality of lead wires of the wire assembly and constructed to electrically couple the wire assembly with an output of a second PV module of the PV system.Type: ApplicationFiled: October 16, 2013Publication date: April 16, 2015Applicant: General Electric CompanyInventors: Philip Michael Cioffi, Maja Harfman Todorovic, Michael Scott Herzog, Charles Steven Korman, Donald M. Doherty, Neil Anthony Johnson
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Publication number: 20150101653Abstract: A micro-inverter assembly includes a housing having an opening formed in a bottom surface thereof, and a direct current (DC)-to-alternating current (AC) micro-inverter disposed within the housing at a position adjacent to the opening. The micro-inverter assembly further includes a micro-inverter DC connector electrically coupled to the DC-to-AC micro-inverter and positioned within the opening of the housing, the micro-inverter DC connector having a plurality of exposed electrical contacts.Type: ApplicationFiled: October 16, 2013Publication date: April 16, 2015Applicant: General Electric CompanyInventors: Philip Michael Cioffi, Maja Harfman Todorovic, Michael Scott Herzog, Charles Steven Korman, Donald M. Doherty, Neil Anthony Johnson