Patents by Inventor Kasemsan Siri
Kasemsan Siri 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: 11851178Abstract: An unmanned aerial vehicle (UAV) that provides increased operational flight endurance and efficiency. The UAV includes a power generation system, which includes an internal combustion engine and one or more batteries (batteries). The power generation system is configured to generate power for propulsion of the UAV. The internal combustion engine is configured to power a lift propeller, generating vertical lift of the UAV, and the batteries are configured to power a micro-propeller assembly, propelling the UAV in a forward direction or multiple additional directions.Type: GrantFiled: February 14, 2020Date of Patent: December 26, 2023Assignee: The Aerospace CorporationInventors: Steven Beck, David Caldwell, Christopher Hartney, Bernard Harris Jefferson, Jr., Jeffrey Lang, John Morales, Martin Panevsky, Kasemsan Siri, Evan Ulrich, Richard Welle, Allyson Yarbrough
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Publication number: 20210265837Abstract: An apparatus may include a group of distributed-input series-output (DISO) converters, each of which are actively controlled by a common maximum power tracking (MPT) controller. The common MPT controller is configured to actively control one of the DISO converters in the group of DISO converters to update a present group-peak power voltage of the one DISO converters while remaining DISO converters in the group of DISO converters are controlled to hold most recently grouped peak power voltages updated during their previously non-overlapping uniform time windows of active MPT control.Type: ApplicationFiled: May 13, 2021Publication date: August 26, 2021Inventor: Kasemsan Siri
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Publication number: 20210253240Abstract: An unmanned aerial vehicle (UAV) that provides increased operational flight endurance and efficiency. The UAV includes a power generation system, which includes an internal combustion engine and one or more batteries (batteries). The power generation system is configured to generate power for propulsion of the UAV. The internal combustion engine is configured to power a lift propeller, generating vertical lift of the UAV, and the batteries are configured to power a micro-propeller assembly, propelling the UAV in a forward direction or multiple additional directions.Type: ApplicationFiled: February 14, 2020Publication date: August 19, 2021Inventors: Steven BECK, David CALDWELL, Christopher HARTNEY, Bernard Harris JEFFERSON, JR., Jeffrey LANG, John MORALES, Martin PANEVSKY, Kasemsan SIRI, Evan ULRICH, Richard WELLE, Allyson YARBROUGH
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Patent number: 11056881Abstract: An apparatus may include a group of distributed-input series-output (DISO) converters, each of which are actively controlled by a common maximum power tracking (MPT) controller. The common MPT controller is configured to actively control one of the DISO converters in the group of DISO converters to update a present group-peak power voltage of the one DISO converters while remaining DISO converters in the group of DISO converters are controlled to hold most recently grouped peak power voltages updated during their previously non-overlapping uniform time windows of active MPT control.Type: GrantFiled: June 3, 2019Date of Patent: July 6, 2021Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Publication number: 20200381918Abstract: An apparatus may include a group of distributed-input series-output (DISO) converters, each of which are actively controlled by a common maximum power tracking (MPT) controller. The common MPT controller is configured to actively control one of the DISO converters in the group of DISO converters to update a present group-peak power voltage of the one DISO converters while remaining DISO converters in the group of DISO converters are controlled to hold most recently grouped peak power voltages updated during their previously non-overlapping uniform time windows of active MPT control.Type: ApplicationFiled: June 3, 2019Publication date: December 3, 2020Inventor: Kasemsan SIRI
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Patent number: 9960602Abstract: Optimum power tracking for distributed power sources may be provided by a family of power system architectures having distributed-input series-output (DISO) converters. The DISO converters may be controlled to achieve uniform input voltages across their respective distributed power sources while also tracking an optimum power point of the power system. Each DISO converter may be operably connected to a corresponding power source to form a power-processing channel. A controller may be operably connected to the plurality of DISO converters to control the operation thereof.Type: GrantFiled: June 24, 2014Date of Patent: May 1, 2018Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Patent number: 9853573Abstract: A grid-tie inverter (the “inverter”) may include a power converter that receives a direct current (DC) output voltage from a DC input power source, and generates an alternating current (AC) output voltage for transmission to a utility power grid. The inverter may also include a system controller that regulates the AC output voltage to efficiently transfer power to the utility power grid while a system AC load may be terminated across the output of the inverter. The inverter may also provide active power factor correction between the utility grid voltage and current. Furthermore, the inverter may also offer harmonic cancellation, which minimizes or eliminates the harmonic content out of the utility power grid voltage and current.Type: GrantFiled: March 28, 2016Date of Patent: December 26, 2017Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Publication number: 20170279376Abstract: A grid-tie inverter (the “inverter”) may include a power converter that receives a direct current (DC) output voltage from a DC input power source, and generates an alternating current (AC) output voltage for transmission to a utility power grid. The inverter may also include a system controller that regulates the AC output voltage to efficiently transfer power to the utility power grid while a system AC load may be terminated across the output of the inverter. The inverter may also provide active power factor correction between the utility grid voltage and current. Furthermore, the inverter may also offer harmonic cancellation, which minimizes or eliminates the harmonic content out of the utility power grid voltage and current.Type: ApplicationFiled: March 28, 2016Publication date: September 28, 2017Inventor: KASEMSAN SIRI
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Patent number: 9325176Abstract: Embodiments of the present invention provide an apparatus for optimum power tracking for distributed power sources. The apparatus includes a plurality of distributed-input parallel-output converters. Each converter is operably connected to a corresponding power source to form a power-processing channel. The apparatus also includes a controller operably connected to the plurality of converters, and is configured to provide uniform input voltages across each power source while tracking an optimum power point. The controller provides tolerance for multiple faults up to N?1 power source failures for the apparatus comprising an N-channel converter power system with N distributed power sources.Type: GrantFiled: May 2, 2012Date of Patent: April 26, 2016Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Patent number: 9013061Abstract: A multisource power system utilizing output isolated DC-DC converters in a serial input, parallel output arrangement provides uniform input voltage distribution and selective maximum power tracking wherein embodiments include maximum power tracking (“MPT”) with a single MPT controller, a battery dominated output voltage bus, and a regulated output voltage bus.Type: GrantFiled: October 11, 2011Date of Patent: April 21, 2015Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Publication number: 20140319918Abstract: Optimum power tracking for distributed power sources may be provided by a family of power system architectures having distributed-input series-output (DISO) converters. The DISO converters may be controlled to achieve uniform input voltages across their respective distributed power sources while also tracking an optimum power point of the power system. Each DISO converter may be operably connected to a corresponding power source to form a power-processing channel. A controller may be operably connected to the plurality of DISO converters to control the operation thereof.Type: ApplicationFiled: June 24, 2014Publication date: October 30, 2014Inventor: Kasemsan Siri
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Publication number: 20130293022Abstract: Embodiments of the present invention provide an apparatus for optimum power tracking for distributed power sources. The apparatus includes a plurality of distributed-input parallel-output converters. Each converter is operably connected to a corresponding power source to form a power-processing channel. The apparatus also includes a controller operably connected to the plurality of converters, and is configured to provide uniform input voltages across each power source while tracking an optimum power point. The controller provides tolerance for multiple faults up to N?1 power source failures for the apparatus comprising an N-channel converter power system with N distributed power sources.Type: ApplicationFiled: May 2, 2012Publication date: November 7, 2013Applicant: The Aerospace CorporationInventor: Kasemsan Siri
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Publication number: 20130088081Abstract: A multisource power system utilizing output isolated DC-DC converters in a serial input, parallel output arrangement provides uniform input voltage distribution and selective maximum power tracking wherein embodiments include maximum power tracking (“MPT”) with a single MPT controller, a battery dominated output voltage bus, and a regulated output voltage bus.Type: ApplicationFiled: October 11, 2011Publication date: April 11, 2013Inventor: Kasemsan Siri
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Patent number: 8351229Abstract: A power system controller includes multiple channels and each channel has a current sharing controller that is coupled to a shared current signal bus and a shared voltage signal bus.Type: GrantFiled: March 24, 2010Date of Patent: January 8, 2013Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Publication number: 20110235379Abstract: A power system controller includes multiple channels and each channel has a current sharing controller that is coupled to a shared current signal bus and a shared voltage signal bus.Type: ApplicationFiled: March 24, 2010Publication date: September 29, 2011Inventor: Kasemsan Siri
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Patent number: 7964991Abstract: A channelized uniform distribution power system controls individual channels of power converters with each channel of power converters having uniform output power as the channels are controlled by voltage control signals from respective controllers that are interconnected by a shared current signal and a shared voltage signal for controlling the channels to provide uniform power, with conventional current limiting and voltage regulation functions. Each channel may have a number of converters being parallel-input parallel-output connected converters, series input parallel-output connected converters, and parallel-input series output connected converters.Type: GrantFiled: February 20, 2009Date of Patent: June 21, 2011Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Publication number: 20100213767Abstract: A channelized uniform distribution power system controls individual channels of power converters with each channel of power converters having uniform output power as the channels are controlled by voltage control signals from respective controllers that are interconnected by a shared current signal and a shared voltage signal for controlling the channels to provide uniform power, with conventional current limiting and voltage regulation functions. Each channel may have a number of converters being parallel-input parallel-output connected converters, series input parallel-output connected converters, and parallel-input series output connected converters.Type: ApplicationFiled: February 20, 2009Publication date: August 26, 2010Inventor: Kasemsan Siri
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Patent number: 7773395Abstract: A uniform converter input voltage distribution power system evenly controls the individual input voltages of DC-to-DC series-input parallel-output connected converters using a uniform input voltage distribution controller including a generator for generating respective error signals from the converter input voltages using a common distribution reference signal for providing respective converter control signals connected to the converters through respective shared-bus controls for evenly distributing the power delivered by the converters that are shared-bus current-mode converters for preferably providing a low output voltage. Employing a common regulation control signal, the controller can also provide system output voltage regulation, system input current limiting, proportional-voltage control, relaxed voltage uniformity, and fault-tolerant power control.Type: GrantFiled: February 21, 2007Date of Patent: August 10, 2010Assignee: The Aerospace CorporationInventor: Kasemsan Siri
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Patent number: 7564149Abstract: A power and control architecture employing circuitry that sequentially regulate power flows from independent solar-array sources or a mixture of power sources providing power to a common load. The device may be used on a satellite with solar-array sources; however it may also be used on ground based systems. Stiff bus voltage regulation is obtained by tightly controlling the most recently activated power-processing channel while keeping the previously activated power-processing channels in the Maximum Power Tracking mode to supply maximum power to a common load. The remaining power-processing channels are turned off or operated in stand-by mode. In an alternative system, with primary design goal of uniform power sharing among solar-array sources, all solar array sources are activated with uniform power sharing at light load and, as load demand increases, sequentially controlled to operate in the Maximum Power Tracking mode one solar array source at a time as necessary.Type: GrantFiled: July 12, 2005Date of Patent: July 21, 2009Inventors: Kasemsan Siri, Richard L. Weinbrenner
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Publication number: 20080197825Abstract: A uniform converter input voltage distribution power system evenly controls the individual input voltages of DC-to-DC series-input parallel-output connected converters using a uniform input voltage distribution controller including a generator for generating respective error signals from the converter input voltages using a common distribution reference signal for providing respective converter control signals connected to the converters through respective shared-bus controls for evenly distributing the power delivered by the converters that are shared-bus current-mode converters for preferably providing a low output voltage. Employing a common regulation control signal, the controller can also provide system output voltage regulation, system input current limiting, proportional-voltage control, relaxed voltage uniformity, and fault-tolerant power control.Type: ApplicationFiled: February 21, 2007Publication date: August 21, 2008Inventor: Kasemsan Siri