Patents by Inventor Kamiar Karimi
Kamiar Karimi 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: 10840839Abstract: A system may include an independent speed variable frequency (ISVF) generator and an excitation source configured to provide an excitation signal to rotor field windings of the ISVF generator to produce a rotating magnetic flux that is independent of a shaft speed of the ISVF generator. The system may include a bus configured to receive an output voltage of the ISVF generator. A generator control unit may be configured to generate a first excitation voltage reference component based on a shaft frequency of the ISVF generator, generate a second excitation voltage reference component based on a difference between a reference voltage and a measured output voltage of the ISVF generator, and generate an excitation voltage control signal based on a combination of the first excitation voltage reference component and the second excitation voltage reference component, the excitation voltage control signal usable to control a voltage magnitude of the excitation signal.Type: GrantFiled: October 1, 2019Date of Patent: November 17, 2020Assignee: THE BOEING COMPANYInventors: Lijun Gao, Shengyi Liu, Eugene Solodovnik, Kamiar Karimi
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Patent number: 10476379Abstract: A power supply system suitable for use by an aircraft is disclosed. The power system converts power from an unregulated DC power source to multiple AC and DC voltage outputs. The power supply system comprises an interleaved buck converter, and interleaved full-bridge converter, an interleaved inverter, and a control system. In one configuration, the interleaved inverter uses high-voltage DC generated by the interleaved four-bridge converter as its power input to generate a high-voltage AC output.Type: GrantFiled: November 22, 2016Date of Patent: November 12, 2019Assignee: The Boeing CompanyInventors: Kamiar Karimi, Shengyi Liu, Duanyang Wang, Francisco de Leon, Qingquan Tang, Dazhong Gu, Dariusz Czarkowski, Kerim Colak, Mariusz Bojarski
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Publication number: 20170072882Abstract: A power supply system suitable for use by an aircraft is disclosed. The power system converts power from an unregulated DC power source to multiple AC and DC voltage outputs. The power supply system comprises an interleaved buck converter, and interleaved full-bridge converter, an interleaved inverter, and a control system. In one configuration, the interleaved inverter uses high-voltage DC generated by the interleaved four-bridge converter as its power input to generate a high-voltage AC output.Type: ApplicationFiled: November 22, 2016Publication date: March 16, 2017Inventors: Kamiar Karimi, Shengyi Liu, Duanyang Wang, Francisco de Leon, Qingquan Tang, Dazhong Gu, Dariusz Czarkowski, Kerim Colak, Mariusz Bojarski
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Patent number: 9533638Abstract: A power supply system suitable for use by an aircraft is disclosed. The power system converts power from an unregulated DC power source to multiple AC and DC voltage outputs. The power supply system comprises an interleaved buck converter, and interleaved full-bridge converter, an interleaved inverter, and a control system. In one configuration, the interleaved inverter uses high-voltage DC generated by the interleaved four-bridge converter as its power input to generate a high-voltage AC output.Type: GrantFiled: July 18, 2013Date of Patent: January 3, 2017Assignee: The Boeing CompanyInventors: Kamiar Karimi, Shengyi Liu, Duanyang Wang, Francisco de Leon, Qingquan Tang, Dazhong Gu, Dariusz Czarkowski, Kerim Colak, Mariusz Bojarski
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Patent number: 9140731Abstract: A controller and infrastructure for an impedance analyzer measures responses to perturbations to respective phases of a multi-phase system at an interface between stages thereof (which may be considered as a source and load in regard to each other), such as a multi-phase electrical power system, to determine a transfer function for each phase of the multi-phase system from which the impedance of each of the source and load can be calculated, particularly for assessing the stability of the multi-phase system.Type: GrantFiled: September 14, 2012Date of Patent: September 22, 2015Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Gerald Francis, Rolando Burgos, Dushan Boroyevich, Fred Wang, Zhiyu Shen, Paolo Mattavelli, Kamiar Karimi, Sheau-Wei Johnny Fu
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Patent number: 9136773Abstract: Approximating loci of eigenvalues or characteristic gains of a return ratio matrix of a model of a multi-phase power converter circuit by the loci of the d-d and q-q elements of said synchronous frame of reference applied to said model, allows determination and assessment of stability of the circuit or forbidden operational parameters of the combination of an AC power source and a power converter at an interface thereof by application of a standard Nyquist stability criterion.Type: GrantFiled: September 10, 2012Date of Patent: September 15, 2015Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Rolando Burgos, Dushan Boroyevich, Fred Wang, Kamiar Karimi
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Patent number: 9048726Abstract: A control system for a power drive section of a three-phase system is disclosed. The control system comprises a positive sequence channel, a negative sequence channel, and a zero sequence channel. The positive sequence channel processes positive sequence error signals, the negative sequence channel processes negative sequence error signals, and the zero sequence channel processes zero sequence error signals. Each sequence channel includes a harmonic repetitive controller, a repetitive controller compensator, and a fundamental frequency controller configured to operate in parallel with the harmonic repetitive controller and repetitive controller compensator. Both the repetitive controller compensator of the negative sequence channel and the repetitive controller compensator of the positive sequence channel are configured with the same, first frequency response.Type: GrantFiled: March 11, 2013Date of Patent: June 2, 2015Assignee: The Boeing CompanyInventors: Qingquan Tang, Dariusz Czarkowski, Francisco de Leon, Kamiar Karimi, Shengyi Liu
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Patent number: 8964432Abstract: A power conversion system is disclosed that provides multiphase power, including phase voltages for each phase of the multiphase power. The system comprises a plurality of inverters that generate PWM output voltages based on PWM control signals. A plurality of inductive components is configured to receive the PWM output voltages to generate the phase voltages. The PWM output voltages cause circulating current flows through the inductive components. A voltage controller is employed that is responsive to the phase voltages to generate voltage modulation signals corresponding to the phase voltages. A plurality of current sharing channels are respectively associated with each of the plurality of inductive components and are configured generate current sharing modulation signals in response to the circulating current flows. The PWM control signals are generated based on modulation signals obtained by combining the current sharing modulation signals and voltage modulation signals.Type: GrantFiled: January 29, 2013Date of Patent: February 24, 2015Assignee: The Boeing CompanyInventors: Qingquan Tang, Dazhong Gu, Dariusz Czarkowski, Francisco de Leon, Kamiar Karimi, Shengyi Liu
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Publication number: 20150021983Abstract: A power supply system suitable for use by an aircraft is disclosed. The power system converts power from an unregulated DC power source to multiple AC and DC voltage outputs. The power supply system comprises an interleaved buck converter, and interleaved full-bridge converter, an interleaved inverter, and a control system. In one configuration, the interleaved inverter uses high-voltage DC generated by the interleaved four-bridge converter as its power input to generate a high-voltage AC output.Type: ApplicationFiled: July 18, 2013Publication date: January 22, 2015Inventors: Kamiar Karimi, Shengyi Liu, Duanyang Wang, Francisco de Leon, Qingquan Tang, Dazhong Gu, Dariusz Czarkowski, Kerim Colak, Mariusz Bojarski
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Publication number: 20140211522Abstract: A power conversion system is disclosed that provides multiphase power, including phase voltages for each phase of the multiphase power. The system comprises a plurality of inverters that generate PWM output voltages based on PWM control signals. A plurality of inductive components is configured to receive the PWM output voltages to generate the phase voltages. The PWM output voltages cause circulating current flows through the inductive components. A voltage controller is employed that is responsive to the phase voltages to generate voltage modulation signals corresponding to the phase voltages. A plurality of current sharing channels are respectively associated with each of the plurality of inductive components and are configured generate current sharing modulation signals in response to the circulating current flows. The PWM control signals are generated based on modulation signals obtained by combining the current sharing modulation signals and voltage modulation signals.Type: ApplicationFiled: January 29, 2013Publication date: July 31, 2014Inventors: Qingquan Tang, Dazhong Gu, Dariusz Czarkowski, Francisco de Leon, Kamiar Karimi, Shengyi Liu
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Publication number: 20130099800Abstract: A controller and infrastructure for an impedance analyzer measures responses to perturbations to respective phases of a multi-phase system at an interface between stages thereof (which may be considered as a source and load in regard to each other), such as a multi-phase electrical power system, to determine a transfer function for each phase of the multi-phase system from which the impedance of each of the source and load can be calculated, particularly for assessing the stability of the multi-phase system.Type: ApplicationFiled: September 14, 2012Publication date: April 25, 2013Inventors: Gerald FRANCIS, Rolando BURGOS, Dushan BOROYEVICH, Fred WANG, Zhiyu SHEN, Paolo MATTAVELLI, Kamiar KARIMI, Sheau-Wei Johnny FU
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Publication number: 20130076332Abstract: Approximating loci of eigenvalues or characteristic gains of a return ratio matrix of a model of a multi-phase power converter circuit by the loci of the d-d and q-q elements of said synchronous frame of reference applied to said model, allows determination and assessment of stability of the circuit or forbidden operational parameters of the combination of an AC power source and a power converter at an interface thereof by application of a standard Nyquist stability criterion.Type: ApplicationFiled: September 10, 2012Publication date: March 28, 2013Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.Inventors: Rolando Burgos, Dushan Boroyevich, Fred Wang, Kamiar Karimi