Patents by Inventor Ashish R. Bendre
Ashish R. Bendre 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: 11394290Abstract: A methods and systems for generating rectified signals are disclosed. For example, a system performing the methods includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: GrantFiled: April 8, 2021Date of Patent: July 19, 2022Assignee: DRS Naval Power Systems, Inc.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Publication number: 20210257900Abstract: A methods and systems for generating rectified signals are disclosed. For example, a system performing the methods includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: ApplicationFiled: April 8, 2021Publication date: August 19, 2021Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Patent number: 11011973Abstract: A methods and systems for generating rectified signals are disclosed. For example, a system performing the methods includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: GrantFiled: March 23, 2020Date of Patent: May 18, 2021Assignee: DRS Naval Power Systems, Inc.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Publication number: 20200227999Abstract: A methods and systems for generating rectified signals are disclosed. For example, a system performing the methods includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: ApplicationFiled: March 23, 2020Publication date: July 16, 2020Applicant: DRS Power & Control Technologies, Inc.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Patent number: 10630162Abstract: A system includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: GrantFiled: July 6, 2018Date of Patent: April 21, 2020Assignee: DRS Power & Control Technologies, Inc.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Publication number: 20180316257Abstract: A system includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: ApplicationFiled: July 6, 2018Publication date: November 1, 2018Applicant: DRS Power & Control Technologies, Inc.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Patent number: 10056820Abstract: A system includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: GrantFiled: November 5, 2015Date of Patent: August 21, 2018Assignee: DRS POWER & CONTROL TECHNOLOGIES, INC.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Publication number: 20160126824Abstract: A system includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: ApplicationFiled: November 5, 2015Publication date: May 5, 2016Applicant: DRS Power & Control Technologies, Inc.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Patent number: 9240732Abstract: A system includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: GrantFiled: May 22, 2013Date of Patent: January 19, 2016Assignee: DRS Power & Control Technologies, Inc.Inventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Patent number: 8737098Abstract: A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals of said plurality of k-level flying capacitor H bridge modules in series to form a cascading set of modules, and a dc source connected to an ac source and having a transformer, a rectifier rectifying an output voltage of said transformer, and a capacitor connected between the positive and negative dc terminals.Type: GrantFiled: February 17, 2012Date of Patent: May 27, 2014Assignee: DRS Power & Control Technologies, Inc.Inventors: Ashish R. Bendre, Slobadan Krstic
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Publication number: 20130314953Abstract: A system includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.Type: ApplicationFiled: May 22, 2013Publication date: November 28, 2013Applicant: Engineered Electric Company d/b/a DRS FremontInventors: Robert M. Cuzner, Ashish R. Bendre, William R. Kranz
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Publication number: 20130051094Abstract: A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals of said plurality of k-level flying capacitor H bridge modules in series to form a cascading set of modules, and a dc source connected to an ac source and having a transformer, a rectifier rectifying an output voltage of said transformer, and a capacitor connected between the positive and negative dc terminals.Type: ApplicationFiled: February 17, 2012Publication date: February 28, 2013Applicant: DRS Power & Control Technologies, Inc.Inventors: Ashish R. Bendre, Slobodan Krstic
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Patent number: 8144491Abstract: A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals of said plurality of k-level flying capacitor H bridge modules in series to form a cascading set of modules, and a dc source connected to an ac source and having a transformer, a rectifier rectifying an output voltage of said transformer, and a capacitor connected between the positive and negative dc terminals.Type: GrantFiled: December 31, 2008Date of Patent: March 27, 2012Assignee: DRS Power & Control Technologies, Inc.Inventors: Ashish R. Bendre, Slobodan Krstic
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Patent number: 7920393Abstract: A four pole, three-phase, NPC converter that produces virtually no common mode voltage. The low common mode voltage output is achieved by constraining the switch states of the NPC converter. A fourth pole and associated control balance the upper and lower DC link voltages. The converter may be an inverter or a rectifier.Type: GrantFiled: June 2, 2008Date of Patent: April 5, 2011Assignee: DRS Power & Control Technologies, Inc.Inventors: Ashish R. Bendre, James C. Vander Meer, Robert M. Cuzner, Craig Goshaw
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Patent number: 7894224Abstract: A voltage drive system is provided having a plurality of modulators and a plurality of cascaded switching circuits which collectively generate a single-phase output signal to a load. Each modulator receives a phase current error and has an adder which generates a modulated phase current error based on the phase current error and based on a signal having a phase. For each respective modulator, the phase of the respective signal is different. Each respective modulator changes a respective gate input when the respective modulated phase current error changes from being within a predetermined current range to being outside of the predetermined current range. Each respective switching circuit receives the respective gate input and generates a respective output terminal voltage based on the respective gate input. The change in the respective gate input effectively causes a switching event of the respective switching circuit.Type: GrantFiled: October 7, 2008Date of Patent: February 22, 2011Assignee: DRS Power & Technologies, Inc.Inventors: James A Ulrich, Ashish R Bendre
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Publication number: 20100165688Abstract: A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals of said plurality of k-level flying capacitor H bridge modules in series to form a cascading set of modules, and a dc source connected to an ac source and having a transformer, a rectifier rectifying an output voltage of said transformer, and a capacitor connected between the positive and negative dc terminals.Type: ApplicationFiled: December 31, 2008Publication date: July 1, 2010Applicant: DRS POWER & CONTROL TECHNOLGIES, INC.Inventors: Ashish R. Bendre, Slobodan Krstic
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Publication number: 20100085789Abstract: A voltage drive system is provided having a plurality of modulators and a plurality of cascaded switching circuits which collectively generate a single-phase output signal to a load. Each modulator receives a phase current error and has an adder which generates a modulated phase current error based on the phase current error and based on a signal having a phase. For each respective modulator, the phase of the respective signal is different. Each respective modulator changes a respective gate input when the respective modulated phase current error changes from being within a predetermined current range to being outside of the predetermined current range. Each respective switching circuit receives the respective gate input and generates a respective output terminal voltage based on the respective gate input. The change in the respective gate input effectively causes a switching event of the respective switching circuit.Type: ApplicationFiled: October 7, 2008Publication date: April 8, 2010Applicant: DRS Power & Control Technologies, Inc.Inventors: James A. Ulrich, Ashish R. Bendre
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Publication number: 20080298103Abstract: A four pole, three-phase, NPC converter that produces virtually no common mode voltage. The low common mode voltage output is achieved by constraining the switch states of the NPC converter. A fourth pole and associated control balance the upper and lower DC link voltages. The converter may be an inverter or a rectifier.Type: ApplicationFiled: June 2, 2008Publication date: December 4, 2008Applicant: DRS POWER & CONTROL TECHNOLOGIES, INC.Inventors: Ashish R. Bendre, James C. Vander Meer, Robert M. Cuzner, Craig Goshaw
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Patent number: 7307361Abstract: A medium voltage power converter is provided that has an input transformer adapted to connect to a multi-phase power source, multiple low voltage drives each coupled to a respective set of secondary windings of the input transformer and operatively configured to provide a corresponding set of three-phase power outputs, and an output transformer. The output transformer has multiple input primary winding circuits each operatively coupled to the three-phase power outputs of a respective one of the drives, a plurality of output secondary winding circuits each disposed in relation to a respective input primary winding circuit, and a secondary winding connection arrangement in which each output secondary winding circuit has three secondary windings each of which is connected in series or in parallel with each other secondary winding of each other output secondary winding circuit to form a respective one of three phase-shifted outputs of the secondary winding connection arrangement.Type: GrantFiled: November 13, 2006Date of Patent: December 11, 2007Assignee: DRS Power & Control Technologies, Inc.Inventors: Ashish R. Bendre, Slobodan Krstic, James C. Vandermeer