Patents by Inventor Rajib Datta
Rajib Datta 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: 20190006831Abstract: 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: September 6, 2018Publication date: January 3, 2019Inventors: Xu She, Rajib Datta, Ravisekhar Nadimpalli Raju, Maja Harfman- Todorovic, Philip Michael Cioffi
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Patent number: 10103534Abstract: 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: GrantFiled: October 27, 2016Date of Patent: October 16, 2018Assignee: GENERAL ELECTRIC COMPANYInventors: Xu She, Rajib Datta, Ravisekhar Nadimpalli Raju, Maja Harfman-Todorovic, Philip Michael Cioffi
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Publication number: 20180191166Abstract: Power converters for use in energy systems are included. For instance, an energy system can include an input power source configured to provide a low voltage direct current power. The energy system can include a power converter configured to convert the low voltage direct current power provided by the input power source to a medium voltage multiphase alternating current output power suitable for provision to an alternating current power system. The power converter can include a plurality conversion modules. Each conversion module includes a plurality of bridge circuits. Each bridge circuit includes a plurality of silicon carbide switching devices coupled in series. Each conversion module is configured to provide a single phase of the medium voltage multiphase alternating current output power on a line bus of the energy system.Type: ApplicationFiled: January 5, 2017Publication date: July 5, 2018Inventors: Robert Gregory Wagoner, Govardhan Ganireddy, Saurabh Shukla, Rajni Kant Burra, Ravisekhar Nadimpalli Raju, Rui Zhou, Rajib Datta, John Leo Bollenbecker
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Publication number: 20180191280Abstract: Power converters for use in wind turbine systems are included. For instance, a wind turbine system can include a wind driven doubly fed induction generator having a stator and a rotor. The stator is configured to provide a medium voltage alternating current power on a stator bus of the wind turbine system. The wind turbine system includes a power converter configured to convert a low voltage alternating current power provided by the rotor to a medium voltage multiphase alternating current output power suitable for provision to an electrical grid. The power converter includes a plurality conversion modules. Each conversion module includes a plurality of bridge circuits. Each bridge circuit includes a plurality of silicon carbide switching devices coupled in series. Each conversion module is configured to provide a single phase of the medium voltage multiphase alternating current output power on a line bus of the wind turbine system.Type: ApplicationFiled: January 5, 2017Publication date: July 5, 2018Inventors: Robert Gregory Wagoner, Govardhan Ganireddy, Saurabh Shukla, Rajni Kant Burra, Ravisekhar Nadimpalli Raju, Rui Zhou, Rajib Datta, John Leo Bollenbecker
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Publication number: 20180187652Abstract: Power converters for use in wind turbine systems are included. For instance, a wind turbine system can include a full power generator having a stator and a rotor. The generator is configured to provide a low voltage alternating current power on a stator bus of the wind turbine system. The wind turbine system includes a power converter configured to convert the low voltage alternating current power provided on the stator bus to a medium voltage multiphase alternating current output power suitable for provision to the electrical grid. The power converter includes a plurality of conversion modules, each conversion module comprising a plurality of bridge circuits. Each bridge circuit includes a plurality of silicon carbide switching devices coupled in series. Each conversion module is configured to provide a single phase of the medium voltage multiphase alternating current output power on a line bus of the wind turbine system.Type: ApplicationFiled: January 5, 2017Publication date: July 5, 2018Inventors: Robert Gregory Wagoner, Govardhan Ganireddy, Saurabh Shukla, Rajni Kant Burra, Ravisekhar Nadimpalli Raju, Rui Zhou, Rajib Datta, John Leo Bollenbecker
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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: 9800132Abstract: A power conversion system may include a plurality of power devices and a sensor operably coupled to at least one of the plurality of power devices and configured to detect a voltage, current, or electromagnetic signature signal associated with the plurality of power devices. The power converter may also include circuitry operably coupled to the plurality of power devices and the sensor. The circuitry may send a respective gate signal to each respective power device of the plurality of power devices, such that each respective gate signal is delayed by a respective compensation delay that is determined for the respective power device based on a respective time delay of the respective power device and a maximum time delay of the plurality of power devices.Type: GrantFiled: December 29, 2015Date of Patent: October 24, 2017Assignee: General Electric CompanyInventors: Paul Michael Szczesny, Rajib Datta, Fengfeng Tao, Jian Dai, Xu She, Tannous Frangieh
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Patent number: 9793827Abstract: A power conversion system includes a first converter effectively connected in series to a second converter. Each converter has a plurality of output levels. A phase-shifted transformer is coupled to the converters. The phase-shifted transformer has a delta-wound winding and an open star winding. The first converter is coupled to the open star winding and the second converter is coupled to the delta winding. The open star winding is configured for direct connection to either of a load or the open star winding of a second phase-shifted transformer, having a delta winding connected to a third converter. One or more DC voltage sources are each connected to the first and second converters by a respective DC link capacitor. Each DC voltage source is connected to a common power grid by an isolated multiphase transformer winding.Type: GrantFiled: March 12, 2014Date of Patent: October 17, 2017Assignee: GE ENERGY POWER CONVERSION TECHNOLOGY LTDInventors: Luis Jose Garces, Cyrus David Harbourt, Richard S Zhang, Allen Michael Ritter, Rajib Datta
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Publication number: 20170187277Abstract: A power conversion system may include a plurality of power devices and a sensor operably coupled to at least one of the plurality of power devices and configured to detect a voltage, current, or electromagnetic signature signal associated with the plurality of power devices. The power converter may also include circuitry operably coupled to the plurality of power devices and the sensor. The circuitry may send a respective gate signal to each respective power device of the plurality of power devices, such that each respective gate signal is delayed by a respective compensation delay that is determined for the respective power device based on a respective time delay of the respective power device and a maximum time delay of the plurality of power devices.Type: ApplicationFiled: December 29, 2015Publication date: June 29, 2017Inventors: Paul Michael Szczesny, Rajib Datta, Fengfeng Tao, Jian Dai, Xu She, Tannous Frangieh
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Publication number: 20170070154Abstract: A multi-level DC-DC converter includes an input side to receive a DC power having an input voltage and current, an output side to provide power to a load at a desired output voltage and current, and a plurality of transformer-isolated DC-DC converters connected between the input and output sides, with the transformer-isolated DC-DC converters being connected in series on one side and connected in parallel on another side. Each of the transformer isolated DC-DC converters further includes a power transformer having a primary winding and a secondary winding, and a plurality of switching devices each selectively operable in one of an On state and an Off state. Operating the switching devices in a complementary On state and Off state alternately at a controlled switching frequency provides for engaging the transformer isolated DC-DC converter and operating the switching devices in a simultaneously On state bypasses the transformer isolated DC-DC converter.Type: ApplicationFiled: November 16, 2016Publication date: March 9, 2017Inventors: Ravisekhar Nadimpalli Raju, Rajib Datta, Xu She
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Patent number: 9559611Abstract: A power converter is presented. The power converter includes at least one leg, the at least one leg includes a first string, where the first string includes a plurality of controllable semiconductor switches, a first connecting node, and a second connecting node, and where the first string is operatively coupled across a first bus and a second bus. Furthermore, the at least one leg includes a second string operatively coupled to the first string via the first connecting node and the second connecting node, where the second string includes a plurality of switching units. A method for power conversion is also presented.Type: GrantFiled: September 28, 2012Date of Patent: January 31, 2017Assignee: General Electric CompanyInventors: Di Zhang, Luis Jose Garces, Rajib Datta, Ravisekhar Nadimpalli Raju
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Patent number: 9520798Abstract: A multi-level DC-DC converter includes an input side to receive a DC power having an input voltage and current, an output side to provide power to a load at a desired output voltage and current, and a plurality of tranformer-isolated DC-DC converters connected between the input and output sides, with the tranformer-isolated DC-DC converters being connected in series on one side and connected in parallel on another side. Each of the tranformer isolated DC-DC converters further includes a power transformer having a primary winding and a secondary winding, and a plurality of switching devices each selectively operable in one of an On state and an Off state. Operating the switching devices in a complementary On state and Off state alternately at a controlled switching frequency provides for engaging the tranformer isolated DC-DC converter and operating the switching devices in a simultaneously On state bypasses the transformer isolated DC-DC converter.Type: GrantFiled: August 26, 2014Date of Patent: December 13, 2016Assignee: General Electric CompanyInventors: Ravisekhar Nadimpalli Raju, Rajib Datta, Xu She
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Patent number: 9520808Abstract: A method and system for a control circuit are provided. The circuit includes an integrating counter coupled to a process wherein the integrating counter is configured to integrate over time a process parameter signal received from the process and to generate a trigger signal when the integrated signal equals a predetermined count. The control circuit also includes a transition controller electrically coupled to a respective control element and configured to receive the trigger signal generated by the integrating counter.Type: GrantFiled: May 27, 2014Date of Patent: December 13, 2016Assignee: General Electric CompanyInventors: Allen Michael Ritter, Robert Allen Seymour, Rajib Datta, John Douglas D'Atre
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Patent number: 9306391Abstract: A direct current (DC) transmission and distribution (T&D) system includes a plurality of DC-to-DC converter devices defining a plurality of isolatable portions of the DC T&D system. The DC T&D system also includes a DC T&D control system coupled to the DC-to-DC converter devices. The DC T&D control system includes a plurality of current sensors. At least one of the current sensors is positioned at one of the DC-to-DC converter devices. The current sensor is configured to transmit signals representative of a value of DC electric current transmission through the DC-to-DC converter device. The DC T&D control system also includes a plurality of processors. At least one processor is coupled to the current sensor and the DC-to-DC converter device. The processor is configured to regulate DC current transmission through the DC-to-DC converter device as a function of the value of DC current transmission through the DC-to-DC converter device.Type: GrantFiled: March 15, 2013Date of Patent: April 5, 2016Assignee: General Electric CompanyInventors: Nilanjan Ray Chaudhuri, Ranjan Kumar Gupta, Rajib Datta, Ravisekhar Nadimpalli Raju
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Publication number: 20160065081Abstract: A multi-level DC-DC converter includes an input side to receive a DC power having an input voltage and current, an output side to provide power to a load at a desired output voltage and current, and a plurality of tranformer-isolated DC-DC converters connected between the input and output sides, with the tranformer-isolated DC-DC converters being connected in series on one side and connected in parallel on another side. Each of the tranformer isolated DC-DC converters further includes a power transformer having a primary winding and a secondary winding, and a plurality of switching devices each selectively operable in one of an On state and an Off state. Operating the switching devices in a complementary On state and Off state alternately at a controlled switching frequency provides for engaging the tranformer isolated DC-DC converter and operating the switching devices in a simultaneously On state bypasses the transformer isolated DC-DC converter.Type: ApplicationFiled: August 26, 2014Publication date: March 3, 2016Inventors: Ravisekhar Nadimpalli Raju, Rajib Datta, Xu She
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Patent number: 9148069Abstract: A high voltage, high power multi-level drive structure includes a plurality of neutral-point-piloted (NPP) converter cells stacked together. At least one clamping diode is connected to one or many NPP converter cells to provide a neutral-point-pilot-clamped (NPPC) converter structure. Flying capacitors connected to the NPPC converter structure yield a neutral-point-clamped-flying-capacitor converter cell structure.Type: GrantFiled: May 25, 2012Date of Patent: September 29, 2015Assignee: General Electric CompanyInventors: Ranjan Kumar Gupta, Rajib Datta, Di Zhang
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Patent number: 9099936Abstract: A high voltage direct current (HVDC) converter system includes a line commutated converter (LCC) configured to convert a plurality of AC voltages and currents to a regulated DC voltage of one of positive and negative polarity and a DC current transmitted in only one direction. The HVDC converter system also includes a buck converter configured to convert a plurality of AC voltages and currents to a regulated DC voltage of one of positive and negative polarity and a DC current transmitted in one of two directions. The LCC and the buck converter are coupled in parallel to an AC conduit and are coupled in series to a DC conduit. The HVDC converter system further includes a filtering device coupled in parallel to the buck converter through the AC conduit. The filtering device is configured to inject AC current having at least one harmonic frequency into the AC conduit.Type: GrantFiled: March 14, 2013Date of Patent: August 4, 2015Assignee: General Electric CompanyInventors: Ranjan Kumar Gupta, Nilanjan Ray Chaudhuri, Luis Jose Garces, Rajib Datta
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Publication number: 20140268960Abstract: A method and system for a control circuit are provided. The circuit includes an integrating counter coupled to a process wherein the integrating counter is configured to integrate over time a process parameter signal received from the process and to generate a trigger signal when the integrated signal equals a predetermined count. The control circuit also includes a transition controller electrically coupled to a respective control element and configured to receive the trigger signal generated by the integrating counter.Type: ApplicationFiled: May 27, 2014Publication date: September 18, 2014Inventors: Allen Michael Ritter, Robert Allen Seymour, Rajib Datta, John Douglas D'Atre
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Publication number: 20140265583Abstract: A direct current (DC) transmission and distribution (T&D) system includes a plurality of DC-to-DC converter devices defining a plurality of isolatable portions of the DC T&D system. The DC T&D system also includes a DC T&D control system coupled to the DC-to-DC converter devices. The DC T&D control system includes a plurality of current sensors. At least one of the current sensors is positioned at one of the DC-to-DC converter devices. The current sensor is configured to transmit signals representative of a value of DC electric current transmission through the DC-to-DC converter device. The DC T&D control system also includes a plurality of processors. At least one processor is coupled to the current sensor and the DC-to-DC converter device. The processor is configured to regulate DC current transmission through the DC-to-DC converter device as a function of the value of DC current transmission through the DC-to-DC converter device.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: GENERAL ELECTRIC COMPANYInventors: Nilanjan Ray Chaudhuri, Ranjan Kumar Gupta, Rajib Datta, Ravisekhar Nadimpalli Raju
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Publication number: 20140265587Abstract: A power conversion system includes a first converter effectively connected in series to a second converter. Each converter has a plurality of output levels. A phase-shifted transformer is coupled to the converters. The phase-shifted transformer has a delta-wound winding and an open star winding. The first converter is coupled to the open star winding and the second converter is coupled to the delta winding. The open star winding is configured for direct connection to either of a load or the open star winding of a second phase-shifted transformer, having a delta winding connected to a third converter. One or more DC voltage sources are each connected to the first and second converters by a respective DC link capacitor. Each DC voltage source is connected to a common power grid by an isolated multiphase transformer winding.Type: ApplicationFiled: March 12, 2014Publication date: September 18, 2014Applicant: GE ENERGY POWER CONVERSION TECHNOLOGY LIMITEDInventors: Luis Jose Garces, Cyrus David Harbourt, Richard S. Zhang, Allen Michael Ritter, Rajib Datta