Patents by Inventor Souren G. Fattal
Souren G. Fattal 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: 9257914Abstract: A method of active rectification control of an active rectifier includes detecting a phase angle and a frequency of a voltage input of the active rectifier; regulating a DC output voltage of the active rectifier with d-q components of a pole voltage; and aligning a reference current input of the active rectifier to the d-q components of the pole voltage.Type: GrantFiled: July 15, 2014Date of Patent: February 9, 2016Assignee: Hamilton Sundstrand CorporationInventor: Souren G. Fattal
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Publication number: 20140328100Abstract: A method of active rectification control of an active rectifier includes detecting a phase angle and a frequency of a voltage input of the active rectifier; regulating a DC output voltage of the active rectifier with d-q components of a pole voltage; and aligning a reference current input of the active rectifier to the d-q components of the pole voltage.Type: ApplicationFiled: July 15, 2014Publication date: November 6, 2014Inventor: Souren G. Fattal
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Patent number: 8804388Abstract: An active rectification system includes an active rectifier, a pulse width modulation (PWM) control, and a closed loop vector control. The PWM control portion is configured to control switching of the active rectifier and the closed loop vector control is configured to generate the required duty cycles for the PWM signals that regulate the DC voltage output and force a three-phase current input of the active rectifier to align with a three-phase pole voltage input of the active rectifier.Type: GrantFiled: December 6, 2010Date of Patent: August 12, 2014Assignee: Hamilton Sundstrand CorporationInventor: Souren G. Fattal
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Patent number: 8643318Abstract: A phase detection system includes a low-resolution sensor and a high-resolution sensor for monitoring an alternating current (AC) voltage. A phase detector receives voltage samples from both the low-resolution sensor and the high-resolution sensor. The phase detector monitors the low-resolution sensor to detect approaching zero cross events (i.e., monitored voltage values approaching zero). In response to an approaching zero-cross event, the phase detector uses the magnitude of the high-resolution voltage samples measured on either side of the zero cross event to determine the phase of the monitored AC voltage.Type: GrantFiled: April 22, 2011Date of Patent: February 4, 2014Assignee: Hamilton Sundstrand CorporationInventors: Souren G. Fattal, John Duward Sagona
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Patent number: 8437158Abstract: An active rectification system includes an active rectifier that converts an alternating current (AC) input to a direct current (DC) output. The active rectifier includes a plurality of switching devices and at least a first output capacitor and a second output capacitor connected at the DC output of the active rectifier. A controller includes a DC output regulation portion and an output capacitor balancing portion, wherein the DC output regulation portion monitors the DC output and in response generates control signals for regulating the DC output to a desired value. The output capacitor balancing portion monitors first and second output capacitor voltages associated with the first and second output capacitors, respectively, and generates an accumulated adjustment value that modifies the control signals provided by the DC output regulation portion to balance the first and second output capacitor voltages.Type: GrantFiled: April 5, 2011Date of Patent: May 7, 2013Assignee: Hamilton Sundstrand CorporationInventor: Souren G. Fattal
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Publication number: 20130088903Abstract: The present invention is a control architecture for an active rectifier. The control architecture monitors the AC input voltage provided to the active rectifier at a sampling rate grater than the frequency of the AC input voltage and calculates, in response, a phase estimate associated with the monitored AC input voltage that is updated with each new sample of the AC input voltage. Based on the phase and frequency estimates, along with monitoring of the AC input current and DC output voltage, the control architecture calculates voltage commands that are used to generate the pulse-width modulation (PWM) controls signals for provision to solid-state switching devices in the active rectifier.Type: ApplicationFiled: October 11, 2011Publication date: April 11, 2013Applicant: HAMILTON SUNDSTRAND CORPORATIONInventors: John Duward Sagona, Souren G. Fattal, Matthew L. Wilhide, Christopher J. Courtney
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Publication number: 20120268974Abstract: A phase detection system includes a low-resolution sensor and a high-resolution sensor for monitoring an alternating current (AC) voltage. A phase detector receives voltage samples from both the low-resolution sensor and the high-resolution sensor. The phase detector monitors the low-resolution sensor to detect approaching zero cross events (i.e., monitored voltage values approaching zero). In response to an approaching zero-cross event, the phase detector uses the magnitude of the high-resolution voltage samples measured on either side of the zero cross event to determine the phase of the monitored AC voltage.Type: ApplicationFiled: April 22, 2011Publication date: October 25, 2012Applicant: HAMILTON SUNDSTRAND CORPORATIONInventors: Souren G. Fattal, John Duward Sagona
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Publication number: 20120257427Abstract: An active rectification system includes an active rectifier that converts an alternating current (AC) input to a direct current (DC) output. The active rectifier includes a plurality of switching devices and at least a first output capacitor and a second output capacitor connected at the DC output of the active rectifier. A controller includes a DC output regulation portion and an output capacitor balancing portion, wherein the DC output regulation portion monitors the DC output and in response generates control signals for regulating the DC output to a desired value. The output capacitor balancing portion monitors first and second output capacitor voltages associated with the first and second output capacitors, respectively, and generates an accumulated adjustment value that modifies the control signals provided by the DC output regulation portion to balance the first and second output capacitor voltages.Type: ApplicationFiled: April 5, 2011Publication date: October 11, 2012Applicant: HAMILTON SUNDSTRAND CORPORATIONInventor: Souren G. Fattal
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Publication number: 20120140537Abstract: An active rectification system includes an active rectifier, a pulse width modulation (PWM) control, and a closed loop vector control. The PWM control portion is configured to control switching of the active rectifier and the closed loop vector control is configured to generate the required duty cycles for the PWM signals that regulate the DC voltage output and force a three-phase current input of the active rectifier to align with a three-phase pole voltage input of the active rectifier.Type: ApplicationFiled: December 6, 2010Publication date: June 7, 2012Applicant: HAMILTON SUNDSTRAND CORPORATIONInventor: Souren G. Fattal
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Patent number: 7687929Abstract: An apparatus includes a vehicular electric power generation system comprising a variable speed internal combustion engine, a first variable speed electric power generator driven by the engine, a second variable speed electric power generator driven by the engine, a first inverter to receive electric power from the first generator a provide a first controlled electric output, a second inverter to receive electric power from the second generator and provide a second controlled electric output, and a controller coupled to the engine. The controller is responsive to variation in electrical loading of the first inverter and the second inverter and a degree of electrical load imbalance between the first inverter and second inverter to provide an engine control signal. The engine is responsive to the one more engine control signals to change rotational operating speed to adjust for the variation in electrical loading and the degree of electrical load imbalance.Type: GrantFiled: June 1, 2007Date of Patent: March 30, 2010Assignee: Cummins Power Generation IP, Inc.Inventor: Souren G. Fattal
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Patent number: 7598623Abstract: An electric power generation system is described can include a variable speed generator and an engine driving the generator to provide an AC electric power output. The output is monitored for different types of transient conditions. For example, electric current of the output is evaluated to identify a first type of transient condition and power factor of the output is evaluated to identify a second type of transient condition. System adjustment is made based on the condition type. In one form, the system is used to provide electricity on board a vehicle such as a motor coach, ship, or the like. In other forms, the system provides electric power to a remote building that does not have access to a public power grid or the system provides back-up power in case of power grid failure or the like.Type: GrantFiled: April 23, 2007Date of Patent: October 6, 2009Assignee: Cummins Power Generation IP, Inc.Inventors: Souren G. Fattal, Mitchell E. Peterson
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Patent number: 7554214Abstract: An electric power generation system is disclosed that provides an AC electric power output with the target waveform period. A sequence of values is established that each represent electric current of the output for a corresponding one of a number of sequential time segments. A processor executes operating logic to process the values for each respective one of the time segments that includes: determining a difference between a first one of the values and the second one of the values for the respective one of the time segments, selecting the second one of the values from the subset of values corresponding to a subset of the time segments, and performing a comparison of the difference to a threshold. Based on this comparison, a transient condition can be identified and/or control of the system can otherwise be facilitated.Type: GrantFiled: April 26, 2007Date of Patent: June 30, 2009Assignee: Cummins Power Generation IP, Inc.Inventor: Souren G. Fattal
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Publication number: 20080157591Abstract: An electric power generation system is described can include a variable speed generator and an engine driving the generator to provide an AC electric power output. The output is monitored for different types of transient conditions. For example, electric current of the output is evaluated to identify a first type of transient condition and power factor of the output is evaluated to identify a second type of transient condition. System adjustment is made based on the condition type. In one form, the system is used to provide electricity on board a vehicle such as a motor coach, ship, or the like. In other forms, the system provides electric power to a remote building that does not have access to a public power grid or the system provides back-up power in case of power grid failure or the like.Type: ApplicationFiled: April 23, 2007Publication date: July 3, 2008Inventors: Souren G. Fattal, Mitchell E. Peterson
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Publication number: 20080157540Abstract: An apparatus includes a vehicular electric power generation system comprising a variable speed internal combustion engine, a first variable speed electric power generator driven by the engine, a second variable speed electric power generator driven by the engine, a first inverter to receive electric power from the first generator a provide a first controlled electric output, a second inverter to receive electric power from the second generator and provide a second controlled electric output, and a controller coupled to the engine. The controller is responsive to variation in electrical loading of the first inverter and the second inverter and a degree of electrical load imbalance between the first inverter and second inverter to provide an engine control signal. The engine is responsive to the one more engine control signals to change rotational operating speed to adjust for the variation in electrical loading and the degree of electrical load imbalance.Type: ApplicationFiled: June 1, 2007Publication date: July 3, 2008Inventor: Souren G. Fattal
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Publication number: 20080157724Abstract: An electric power generation system is disclosed that provides an AC electric power output with the target waveform period. A sequence of values is established that each represent electric current of the output for a corresponding one of a number of sequential time segments. A processor executes operating logic to process the values for each respective one of the time segments that includes: determining a difference between a first one of the values and the second one of the values for the respective one of the time segments, selecting the second one of the values from the subset of values corresponding to a subset of the time segments, and performing a comparison of the difference to a threshold. Based on this comparison, a transient condition can be identified and/or control of the system can otherwise be facilitated.Type: ApplicationFiled: April 26, 2007Publication date: July 3, 2008Inventor: Souren G. Fattal