Patents by Inventor Subbarao Dakshina Murthy Bellur
Subbarao Dakshina Murthy Bellur 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: 11952930Abstract: One exemplary embodiment is a vehicle system comprising an engine, an exhaust aftertreatment system including a heating element, an electric machine configured to selectably operate as a motor or a generator, an inverter module including a plurality of inverter phase legs and an auxiliary leg, and an electronic control system in operative communication with the inverter module and the exhaust aftertreatment system. The electronic control system is configured to evaluate whether the electric machine is operating as a generator, selectably operate the plurality of inverter phase legs to rectify AC power received from the electric machine, evaluate whether to heat one or more components of the exhaust aftertreatment system, and selectably operate the auxiliary leg to provide rectified power from the inverter legs to one or more electrical heating elements thermally coupled with the one or more components exhaust aftertreatment system effective to heat the one or more components.Type: GrantFiled: February 8, 2021Date of Patent: April 9, 2024Assignee: Cummins Inc.Inventors: Subbarao Dakshina Murthy Bellur, Thomas A. Dollmeyer, Jennifer Rumsey, Bradford K. Palmer
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Patent number: 11764748Abstract: Disclosed are designs for inductor cores for electromagnetic interference (EMI) filters. In some embodiments, an inductor core comprises a plurality of enclosed structures, where each enclosed structure of the plurality of enclosed structures includes a plurality of elongated bars and at least one connection device. In some embodiments, an enclosed structure is configured to encompass a signal bus. In some embodiments, an enclosed structure has a longitudinal axis and a triangular cross-sectional shape taken perpendicular to the longitudinal axis.Type: GrantFiled: September 13, 2021Date of Patent: September 19, 2023Assignee: CUMMINS INC.Inventors: Veda Samhitha Duppalli, Santhosh Krishnamoorthi, Sanchit Mishra, Jaroslaw Leonarski, Subbarao Dakshina Murthy-Bellur
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Publication number: 20210164372Abstract: One exemplary embodiment is a vehicle system comprising an engine, an exhaust aftertreatment system including a heating element, an electric machine configured to selectably operate as a motor or a generator, an inverter module including a plurality of inverter phase legs and an auxiliary leg, and an electronic control system in operative communication with the inverter module and the exhaust aftertreatment system. The electronic control system is configured to evaluate whether the electric machine is operating as a generator, selectably operate the plurality of inverter phase legs to rectify AC power received from the electric machine, evaluate whether to heat one or more components of the exhaust aftertreatment system, and selectably operate the auxiliary leg to provide rectified power from the inverter legs to one or more electrical heating elements thermally coupled with the one or more components exhaust aftertreatment system effective to heat the one or more components.Type: ApplicationFiled: February 8, 2021Publication date: June 3, 2021Inventors: Subbarao Dakshina Murthy Bellur, Thomas A. Dollmeyer, Jennifer Rumsey, Bradford K. Palmer
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Patent number: 11004592Abstract: An electric device comprises a core having a center section and two outer sections, a high current winding, and a low current winding. The high current winding includes a plurality of half-turn coils connected in parallel between a first high current terminal and a second high current terminal. Each of the plurality of half-turn coils is wound around a fraction of the center section and forms a loop around one of the two outer sections along with the first and second high current terminals. The low current winding includes a plurality of full-turn coils connected in series between a first low current terminal and a second low current terminal, each of the plurality of full-turn coils wound around the center section of the core substantially fully. The plurality of half-turn coils of the high current winding are interleaved with the plurality of full-turn coils of the low current winding.Type: GrantFiled: November 30, 2017Date of Patent: May 11, 2021Assignee: Cummins Power Generation IP, Inc.Inventors: Subbarao Dakshina Murthy Bellur, Kartik Iyer, Minyu Cai
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Publication number: 20190052181Abstract: One direct current to direct current converter disclosed herein can implement three control modes: a predefined control mode in which an outer phase-shift angle is determined based on a predefined process, a current control mode in which the outer phase-shift angle is determined based on a predefined reference current profile and a DC current output, and a voltage-current control mode in which a reference current value is determined using a reference voltage value and a DC voltage output. The soft starting process can start from the predefined control mode and later switch to the current control mode followed by the voltage-current control mode or directly switch to the voltage-current control mode.Type: ApplicationFiled: October 18, 2018Publication date: February 14, 2019Applicant: Cummins Power Generation IP, Inc.Inventors: Subbarao Dakshina Murthy-Bellur, Heng Yang, Minyu Cai
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Patent number: 10110138Abstract: One direct current to direct current converter disclosed herein can implement three control modes: a predefined control mode in which an outer phase-shift angle is determined based on a predefined process, a current control mode in which the outer phase-shift angle is determined based on a predefined reference current profile and a DC current output, and a voltage-current control mode in which a reference current value is determined using a reference voltage value and a DC voltage output. The soft starting process can start from the predefined control mode and later switch to the current control mode followed by the voltage-current control mode or directly switch to the voltage-current control mode. The soft starting process can also start from the current control mode and later switch to the voltage-current control mode.Type: GrantFiled: May 26, 2017Date of Patent: October 23, 2018Assignee: Cummins Power Generation IP, Inc.Inventors: Subbarao Dakshina Murthy-Bellur, Heng Yang, Minyu Cai
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Patent number: 10050534Abstract: The present disclosure relates to electric converters and methods of controlling the same. One dual-active-bridge direct current to direct current (DC-DC) converter includes a transformer having a primary winding and a secondary winding, a first H-bridge connected to the primary winding, a second H-bridge connected to the secondary winding, and a current sensor structured to measure a current of the transformer. The first H-bridge includes a plurality of switch devices. The second H-bridge includes a plurality of switch devices. The dual-active-bridge DC-DC converter further includes a controller configured to control an on/off state for each of the plurality of switch devices of the first H-bridge and the plurality of switch devices of the second H-bridge based at least in part on the current of the transformer measured by the current sensor.Type: GrantFiled: May 15, 2017Date of Patent: August 14, 2018Assignee: Cummins Power Generation IP, Inc.Inventors: Subbarao Dakshina Murthy-Bellur, Heng Yang, Minyu Cai
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Publication number: 20180158594Abstract: An electric device comprises a core having a center section and two outer sections, a high current winding, and a low current winding. The high current winding includes a plurality of half-turn coils connected in parallel between a first high current terminal and a second high current terminal. Each of the plurality of half-turn coils is wound around a fraction of the center section and forms a loop around one of the two outer sections along with the first and second high current terminals. The low current winding includes a plurality of full-turn coils connected in series between a first low current terminal and a second low current terminal, each of the plurality of full-turn coils wound around the center section of the core substantially fully. The plurality of half-turn coils of the high current winding are interleaved with the plurality of full-turn coils of the low current winding.Type: ApplicationFiled: November 30, 2017Publication date: June 7, 2018Inventors: Subbarao Dakshina Murthy Bellur, Kartik Iyer, Minyu Cai