Patents by Inventor Lyle T. Keister
Lyle T. Keister 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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Publication number: 20230256853Abstract: In one embodiment, an EV charging system includes: a plurality of first converters to receive and convert grid power at a distribution grid voltage to at least one second voltage; a high frequency transformer coupled to the first converters to receive the at least one second voltage and output at least one high frequency AC voltage; and a plurality of port rectifiers coupled to a plurality of secondary windings of the high frequency transformer, each of the port rectifiers comprising a unidirectional AC-DC converter to receive and convert the at least one high frequency AC voltage to a DC voltage. At least some of the port rectifiers may be coupled in series to provide at least one of a charging current or a charging voltage to at least one dispenser to which at least one EV is to couple.Type: ApplicationFiled: April 6, 2023Publication date: August 17, 2023Inventors: Josh Keister, Lyle T. Keister, Mehdi Abolhassani
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Patent number: 11648844Abstract: In one embodiment, an EV charging system includes: a plurality of first converters to receive and convert grid power at a distribution grid voltage to at least one second voltage; a high frequency transformer coupled to the first converters to receive the at least one second voltage and output at least one high frequency AC voltage; and a plurality of port rectifiers coupled to a plurality of secondary windings of the high frequency transformer, each of the port rectifiers comprising a unidirectional AC-DC converter to receive and convert the at least one high frequency AC voltage to a DC voltage. At least some of the port rectifiers may be coupled in series to provide at least one of a charging current or a charging voltage to at least one dispenser to which at least one EV is to couple.Type: GrantFiled: February 21, 2022Date of Patent: May 16, 2023Assignee: Resilient Power Systems, Inc.Inventors: Josh Keister, Lyle T. Keister, Mehdi Abolhassani
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Publication number: 20230121403Abstract: In an embodiment, a power module may include: a plurality of first stages, each having an H-bridge to receive an incoming AC voltage at a first frequency and rectify the incoming AC voltage to a DC voltage; a plurality of DC buses, each to receive the DC voltage from one of the plurality of first stages; a plurality of second stages, each coupled to one of the plurality of DC buses to receive the DC voltage and output a second AC voltage at a second frequency; and a hardware configuration system having fixed components and optional components to provide different configurations for the power module.Type: ApplicationFiled: December 16, 2022Publication date: April 20, 2023Inventors: Mehdi Abolhassani, Lyle T. Keister, Josh Keister
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Publication number: 20230045130Abstract: In an embodiment, a power module may include: a plurality of first stages, each having an H-bridge to receive an incoming AC voltage at a first frequency and rectify the incoming AC voltage to a DC voltage; a plurality of DC buses, each to receive the DC voltage from one of the plurality of first stages; a plurality of second stages, each coupled to one of the plurality of DC buses to receive the DC voltage and output a second AC voltage at a second frequency; and a hardware configuration system having fixed components and optional components to provide different configurations for the power module.Type: ApplicationFiled: August 4, 2021Publication date: February 9, 2023Inventors: Mehdi Abolhassani, Lyle T. Keister, Josh Keister
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Patent number: 11557957Abstract: In an embodiment, a power module may include: a plurality of first stages, each having an H-bridge to receive an incoming AC voltage at a first frequency and rectify the incoming AC voltage to a DC voltage; a plurality of DC buses, each to receive the DC voltage from one of the plurality of first stages; a plurality of second stages, each coupled to one of the plurality of DC buses to receive the DC voltage and output a second AC voltage at a second frequency; and a hardware configuration system having fixed components and optional components to provide different configurations for the power module.Type: GrantFiled: August 4, 2021Date of Patent: January 17, 2023Assignee: Resilient Power Systems, Inc.Inventors: Mehdi Abolhassani, Lyle T. Keister, Josh Keister
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Patent number: 11509233Abstract: In one embodiment, an apparatus includes a surge voltage blocker circuit to couple between a distribution grid network and a grid-side power converter of a power conversion system. The surge voltage blocker circuit may include a plurality of series-coupled AC switch circuits, each including: a bidirectional switch formed of a first power transistor and a second power transistor; and a transient voltage suppression device coupled in parallel with the bidirectional switch.Type: GrantFiled: April 25, 2022Date of Patent: November 22, 2022Assignee: Resilient Power Systems, Inc.Inventors: Josh Keister, Lyle T. Keister, Mehdi Abolhassani
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Publication number: 20220348096Abstract: In one aspect, an electric vehicle (EV) charging system includes: a plurality of first converters to receive grid power at a distribution grid voltage and convert the distribution grid voltage to at least one second voltage; at least one high frequency transformer coupled to the plurality of first converters to receive the second voltage and electrically isolate a plurality of second converters. The EV charging system may further include the plurality of second converters coupled to the output of the at least one high frequency transformer to receive and convert the at least one second voltage to a third DC voltage. At least some of the plurality of second converters are to couple to one or more EV charging dispensers to provide the third DC voltage as a charging voltage or a charging current.Type: ApplicationFiled: February 23, 2022Publication date: November 3, 2022Inventors: Josh Keister, Lyle T. Keister, Mehdi Abolhassani
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Publication number: 20220348101Abstract: In one embodiment, an EV charging system includes: a plurality of first converters to receive and convert grid power at a distribution grid voltage to at least one second voltage; a high frequency transformer coupled to the first converters to receive the at least one second voltage and output at least one high frequency AC voltage; and a plurality of port rectifiers coupled to a plurality of secondary windings of the high frequency transformer, each of the port rectifiers comprising a unidirectional AC-DC converter to receive and convert the at least one high frequency AC voltage to a DC voltage. At least some of the port rectifiers may be coupled in series to provide at least one of a charging current or a charging voltage to at least one dispenser to which at least one EV is to couple.Type: ApplicationFiled: May 26, 2022Publication date: November 3, 2022Inventors: Josh Keister, Lyle T. Keister, Mehdi Abolhassani
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Publication number: 20220348100Abstract: In one embodiment, an EV charging system includes: a plurality of first converters to receive and convert grid power at a distribution grid voltage to at least one second voltage; a high frequency transformer coupled to the first converters to receive the at least one second voltage and output at least one high frequency AC voltage; and a plurality of port rectifiers coupled to a plurality of secondary windings of the high frequency transformer, each of the port rectifiers comprising a unidirectional AC-DC converter to receive and convert the at least one high frequency AC voltage to a DC voltage. At least some of the port rectifiers may be coupled in series to provide at least one of a charging current or a charging voltage to at least one dispenser to which at least one EV is to couple.Type: ApplicationFiled: February 21, 2022Publication date: November 3, 2022Inventors: Josh Keister, Lyle T. Keister, Mehdi Abolhassani
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Patent number: 11370314Abstract: In one embodiment, a system includes: an enclosure; a plurality of first converters adapted within the enclosure to receive grid power at a distribution grid voltage and convert the distribution grid voltage to at least one second voltage; at least one high frequency transformer adapted within the enclosure and coupled to the plurality of first converters to receive the at least one second voltage; a plurality of second converters adapted within the enclosure and coupled to an output of the at least one high frequency transformer to receive the at least one second voltage and convert the at least one second voltage to a third voltage; and a dielectric fluid adapted within the enclosure to provide dielectric isolation.Type: GrantFiled: December 30, 2021Date of Patent: June 28, 2022Assignee: Resilient Power Systems, Inc.Inventors: Josh Keister, Mehdi Abolhassani, Lyle T. Keister
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Patent number: 11292352Abstract: In one aspect, an electric vehicle (EV) charging system includes: a plurality of first converters to receive grid power at a distribution grid voltage and convert the distribution grid voltage to at least one second voltage; at least one high frequency transformer coupled to the plurality of first converters to receive the second voltage and electrically isolate a plurality of second converters. The EV charging system may further include the plurality of second converters coupled to the output of the at least one high frequency transformer to receive and convert the at least one second voltage to a third DC voltage. At least some of the plurality of second converters are to couple to one or more EV charging dispensers to provide the third DC voltage as a charging voltage or a charging current.Type: GrantFiled: April 30, 2021Date of Patent: April 5, 2022Assignee: Resilient Power Systems, Inc.Inventors: Josh Keister, Lyle T. Keister, Mehdi Abolhassani
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Patent number: 6822866Abstract: An AC drive which can be applied to any power using device and in particular is a medium voltage AC drive. In a preferred embodiment, a multilevel AC drive topology is implemented, with the drive including a plurality of inverters and converter electrically coupled through electrical buses and physically coupled through their respective modular bases, and sharing a common cooling system connected to the respective heat exchangers of each component. The AC drive generally is made up of a plurality of inverter modules, which are connected to a converter module, and with each of the above components packaged in a relatively small unit having a cooling apparatus.Type: GrantFiled: November 2, 2001Date of Patent: November 23, 2004Assignee: SMC Electrical Products Inc.Inventors: Oliver Fearing, Geraldo Nojima, Lyle T. Keister
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Publication number: 20040012983Abstract: An AC drive which can be applied to any power using device and in particular is a medium voltage AC drive. In a preferred embodiment, a multilevel AC drive topology is implemented, with the drive including a plurality of inverters and converter electrically coupled through electrical buses and physically coupled through their respective modular bases, and sharing a common cooling system connected to the respective heat exchangers of each component. The AC drive generally is made up of a plurality of inverter modules, which are connected to a converter module, and with each of the above components packaged in a relatively small unit having a cooling apparatus.Type: ApplicationFiled: November 2, 2001Publication date: January 22, 2004Applicant: SMC ELECTRICAL PRODUCTS, INC.Inventors: Oliver Fearing, Geraldo Nojima, Lyle T. Keister
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Patent number: 4455509Abstract: An intrinsically safe lighting system for energizing fluorescent lamps and the like in potentially flammable or explosive atmospheres is disclosed wherein one or more intrinsically safe power supply modules embody current monitoring and diverter circuitry, operable, upon the occurrence of abnormal circuit conditions such as a short or open circuit, to interrupt the lamp power supply and divert energy therefrom so rapidly that non-intrinsically safe sparking and ignition of the flammable atmosphere is avoided.Type: GrantFiled: May 16, 1983Date of Patent: June 19, 1984Inventors: Stephen T. Crum, Lyle T. Keister