Patents by Inventor Ahmed Elasser

Ahmed Elasser 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).

  • Publication number: 20170353111
    Abstract: According to some embodiments, an electronic drive circuit is disclosed. The electronic drive circuit includes an energy storage device and a first bridge circuit coupled to the energy storage device. The first bridge circuit includes at least one leg having two switches. The electronic drive circuit also includes a transformer. The transformer includes a first winding coupled to the first bridge circuit and a second winding coupled to the energy storage device through a center tap. The electronic drive circuit further includes a second bridge circuit coupled to the second winding of the transformer. The second bridge circuit includes a pair of switches operable to conduct in both directions and block voltage in both directions.
    Type: Application
    Filed: June 6, 2016
    Publication date: December 7, 2017
    Applicant: General Electric Company
    Inventors: Ahmed Elasser, Mohammed Agamy, Kum Kang Huh
  • Patent number: 9748767
    Abstract: A system and method for conditioning DC power received from hybrid DC power sources is disclosed. A power conversion circuit is coupled to a respective DC power source to selectively condition the output power generated thereby to a DC bus voltage. The power conversion circuit includes a switch arrangement and capacitors arranged to provide a charge balancing in the power conversion circuit. A controller in operable communication with the switch arrangement receives inputs on a DC bus voltage and at least one parameter related to operation of the DC power source, and determines an adjustable voltage to be output from the conversion circuit to the DC bus based on the received inputs. The controller then selectively controls operation of the switch arrangement in order to generate the determined adjustable voltage.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: August 29, 2017
    Assignee: General Electric Company
    Inventors: Fengfeng Tao, Ahmed Elasser, Song Chi, Maja Harfman Todorovic
  • Patent number: 9633998
    Abstract: A semiconductor device is provided. The semiconductor device includes an avalanche photodiode unit and a thyristor unit. The avalanche photodiode unit is configured to receive incident light to generate a trigger current and comprises a wide band-gap semiconductor. The thyristor unit is configured to be activated by the trigger current to an electrically conductive state. A semiconductor device and a method for making a semiconductor device are also presented.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: April 25, 2017
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Stanislav Ivanovich Soloviev, Ahmed Elasser, Alexander Viktorovich Bolotnikov, Alexey Vert, Peter Almern Losee
  • Publication number: 20170022766
    Abstract: A switch assembly includes one or more solid state semiconductor switches configured to be disposed within a downhole pipe assembly. The one or more switches are configured to operate in a closed state to conduct electric current supplied by a power source disposed above a surface to pumps disposed beneath the surface to cause the pumps to extract a resource from beneath the surface via the pipe assembly. The one or more switches also are configured to operate in an open state to stop conducting the electric current from the power source to the pumps.
    Type: Application
    Filed: July 24, 2015
    Publication date: January 26, 2017
    Inventors: Dong Dong, Antonio Caiafa, Mohammed Agamy, Ahmed Elasser, Philip Michael Cioffi
  • Patent number: 9401708
    Abstract: A gate drive unit includes a charging device, a switch, and a timing module. The charging device is conductively coupled with an electrical energy source and a power switch between the electric energy source and the charging device. The switch closes to transfer electrical energy from the energy source to the charging device. The timing module is configured to close the switch to direct the electrical energy from the electrical energy source to the charging device for a designated charging time period in order to charge the charging device with the electrical energy while the power switch is in an OFF state. The timing module opens the switch to cause the electrical energy stored in the charging device to be transferred out of the charging device in the form of a trigger current that is conducted to a gate terminal of the power switch to activate the power switch to an ON state from the OFF state.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: July 26, 2016
    Assignee: General Electric Company
    Inventors: Fengfeng Tao, Ahmed Elasser, Mohammed Agamy, Patrick Kirlew
  • Patent number: 9300140
    Abstract: A system and method of using one or more DC-DC/DC-AC converters and/or alternative devices allows strings of multiple module technologies to coexist within the same PV power plant. A computing (optimization) framework estimates the percentage allocation of PV power plant capacity to selected PV module technologies. The framework and its supporting components considers irradiation, temperature, spectral profiles, cost and other practical constraints to achieve the lowest levelized cost of electricity, maximum output and minimum system cost. The system and method can function using any device enabling distributed maximum power point tracking at the module, string or combiner level.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: March 29, 2016
    Assignee: General Electric Company
    Inventors: Bex George Thomas, Ahmed Elasser, Srinivas Bollapragada, Anthony William Galbraith, Mohammed Agamy, Maxim Valeryevich Garifullin
  • Publication number: 20150380938
    Abstract: Power delivery systems and methods described herein conductively couple several input lines with a cable that conducts a multi-phase electric current. The input lines separately conduct different phases of the electric current. Output lines are conductively coupled with plural machines, and separately conduct the different phases of the electric current. Plural switching devices are conductively coupled with the input lines and with the output lines, and are used to control the switching devices in order to conduct the different phases of the electric current to the machines. A first set of the switching devices is closed to separately conduct the different phases of the electric current to a first machine of the machines. A different, second set of the switching devices is separately closed to separately conduct the different phases of the electric current to a different, second machine of the machines.
    Type: Application
    Filed: July 22, 2014
    Publication date: December 31, 2015
    Inventors: Ahmed Elasser, Jeremy Daniel Van Dam, David Allan Torrey
  • Publication number: 20150341028
    Abstract: A gate drive unit includes a charging device, a switch, and a timing module. The charging device is conductively coupled with an electrical energy source and a power switch between the electric energy source and the charging device. The switch closes to transfer electrical energy from the energy source to the charging device. The timing module is configured to close the switch to direct the electrical energy from the electrical energy source to the charging device for a designated charging time period in order to charge the charging device with the electrical energy while the power switch is in an OFF state. The timing module opens the switch to cause the electrical energy stored in the charging device to be transferred out of the charging device in the form of a trigger current that is conducted to a gate terminal of the power switch to activate the power switch to an ON state from the OFF state.
    Type: Application
    Filed: May 20, 2014
    Publication date: November 26, 2015
    Applicant: General Electric Company
    Inventors: Fengfeng Tao, Ahmed Elasser, Mohammed Agamy, Patrick Kirlew
  • Publication number: 20150330195
    Abstract: Power systems and methods are disclosed herein. The systems and methods use a switching system coupled with a power source and subterranean pumps for pumping a resource from beneath a surface of earth. A first capacitor is between a first switching device and a first transformer, and stores electric energy received from the first transformer to activate the first switching device. A bias capacitor is between the first capacitor and the first switching device, and receives a bias voltage via a second transformer. The bias capacitor applies the bias voltage to the first switching device to prevent the first switching device from activating unless a combination of the voltage received by the first switching device via the first transformer and the bias voltage is at least as large as the activation voltage of the first switching device.
    Type: Application
    Filed: July 24, 2015
    Publication date: November 19, 2015
    Inventors: Dong Dong, Antonio Caiafa, Mohammed Agamy, Ahmed Elasser
  • Publication number: 20150311708
    Abstract: A system and method for conditioning DC power received from hybrid DC power sources is disclosed. A power conversion circuit is coupled to a respective DC power source to selectively condition the output power generated thereby to a DC bus voltage. The power conversion circuit includes a switch arrangement and capacitors arranged to provide a charge balancing in the power conversion circuit. A controller in operable communication with the switch arrangement receives inputs on a DC bus voltage and at least one parameter related to operation of the DC power source, and determines an adjustable voltage to be output from the conversion circuit to the DC bus based on the received inputs. The controller then selectively controls operation of the switch arrangement in order to generate the determined adjustable voltage.
    Type: Application
    Filed: April 25, 2014
    Publication date: October 29, 2015
    Applicant: General Electric Company
    Inventors: Fengfeng Tao, Ahmed Elasser, Song Chi, Maja Harfman Todorovic
  • Patent number: 9103865
    Abstract: Methods for determining a ground fault or insulation degradation condition within energy conversion systems are described. A method for determining a ground fault within an energy conversion system may include, in part, a comparison of baseline waveform of differential current to a waveform of differential current during operation for a plurality of DC current carrying conductors in an energy conversion system. A method for determining insulation degradation within an energy conversion system may include, in part, a comparison of baseline frequency spectra of differential current to a frequency spectra of differential current transient at start-up for a plurality of DC current carrying conductors in an energy conversion system. In one embodiment, the energy conversion system may be a photovoltaic system.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: August 11, 2015
    Assignee: General Electric Company
    Inventors: Mohamed Agamy, Ahmed Elasser, Anthony William Galbraith, Maja Harfman Todorovic
  • Patent number: 9006027
    Abstract: An electrical device includes a blocking layer disposed on top of a substrate layer, wherein the blocking layer and the substrate layer each are wide bandgap semiconductors, and the blocking layer and the substrate layer form a buried junction in the electrical device. The device comprises a termination feature disposed at a surface of the blocking layer and a filled trench disposed proximate to the termination feature. The filled trench extends through the blocking layer to reach the substrate layer and is configured to direct an electrical potential associated with the buried junction toward the termination feature disposed near the surface of the blocking layer to terminate the buried junction.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: April 14, 2015
    Assignee: General Electric Company
    Inventors: Zachary Matthew Stum, Ahmed Elasser, Stephen Daley Arthur, Stanislav I. Soloviev, Peter Almern Losee
  • Patent number: 8829715
    Abstract: A distributed photovoltaic (PV) power plant includes a plurality of distributed dc-dc converters. The dc-dc converters are configured to switch in coordination with one another such that at least one dc-dc converter transfers power to a common dc-bus based upon the total system power available from one or more corresponding strings of PV modules. Due to the coordinated switching of the dc-dc converters, each dc-dc converter transferring power to the common dc-bus continues to operate within its optimal efficiency range as well as to optimize the maximum power point tracking in order to increase the energy yield of the PV power plant.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: September 9, 2014
    Assignee: General Electric Company
    Inventors: Mohammed Agamy, Ahmed Elasser, Juan Antonio Sabate, Anthony William Galbraith, Maja Harfman Todorovic
  • Publication number: 20140176151
    Abstract: Methods for determining a ground fault or insulation degradation condition within energy conversion systems are described. A method for determining a ground fault within an energy conversion system may include, in part, a comparison of baseline waveform of differential current to a waveform of differential current during operation for a plurality of DC current carrying conductors in an energy conversion system. A method for determining insulation degradation within an energy conversion system may include, in part, a comparison of baseline frequency spectra of differential current to a frequency spectra of differential current transient at start-up for a plurality of DC current carrying conductors in an energy conversion system. In one embodiment, the energy conversion system may be a photovoltaic system.
    Type: Application
    Filed: December 26, 2012
    Publication date: June 26, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Mohamed AGAMY, Ahmed ELASSER, Anthony William GALBRAITH, Maja HARFMAN TODOROVIC
  • Patent number: 8691634
    Abstract: A thyristor device includes a semiconductor body and a conductive anode. The semiconductor body has a plurality of doped layers forming a plurality of dopant junctions and includes an optical thyristor, a first amplifying thyristor, and a switching thyristor. The conductive anode is disposed on a first side of the semiconductor body. The optical thyristor is configured to receive incident radiation to generate a first electric current, and the first amplifying thyristor is configured to increase the first electric current from the optical thyristor to at least a threshold current. The switching thyristor switches to the conducting state in order to conduct a second electric current from the anode and through the semiconductor body.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: April 8, 2014
    Assignee: General Electric Company
    Inventors: Ahmed Elasser, Stephen Daley Arthur, Alexey Vert, Stanislav Ivanovich Soloviev, Peter Almern Losee
  • Publication number: 20140070229
    Abstract: An electrical device includes a blocking layer disposed on top of a substrate layer, wherein the blocking layer and the substrate layer each are wide bandgap semiconductors, and the blocking layer and the substrate layer form a buried junction in the electrical device. The device comprises a termination feature disposed at a surface of the blocking layer and a filled trench disposed proximate to the termination feature. The filled trench extends through the blocking layer to reach the substrate layer and is configured to direct an electrical potential associated with the buried junction toward the termination feature disposed near the surface of the blocking layer to terminate the buried junction.
    Type: Application
    Filed: September 11, 2012
    Publication date: March 13, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Zachary Matthew Stum, Ahmed Elasser, Stephen Daley Arthur, Stanislav I. Soloviev, Peter Almern Losee
  • Publication number: 20140070231
    Abstract: A semiconductor device is provided. The semiconductor device includes an avalanche photodiode unit and a thyristor unit. The avalanche photodiode unit is configured to receive incident light to generate a trigger current and comprises a wide band-gap semiconductor. The thyristor unit is configured to be activated by the trigger current to an electrically conductive state. A semiconductor device and a method for making a semiconductor device are also presented.
    Type: Application
    Filed: September 13, 2012
    Publication date: March 13, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Stanislav Ivanovich Soloviev, Ahmed Elasser, Alexander Viktorovich Bolotnikov, Alexey Vert, Peter Almern Losee
  • Publication number: 20140001856
    Abstract: A partial power converter includes a converter leg including an upper portion comprising at least one diode connected to a positive output node of an output terminal of the partial power converter and a lower portion comprising at least two switches connected in series with each other and with the at least one diode and to a negative output node of the output terminal of the partial power The partial power converter also includes at least one flying capacitor connected between the at least two switches at a first end and to either of the upper portion of the converter leg or the positive output node of the partial power converter at a second end.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 2, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Mohammed Agamy, Ahmed Elasser, Maja Harfman Todorovic
  • Publication number: 20140005845
    Abstract: A system and method of using one or more DC-DC/DC-AC converters and/or alternative devices allows strings of multiple module technologies to coexist within the same PV power plant. A computing (optimization) framework estimates the percentage allocation of PV power plant capacity to selected PV module technologies. The framework and its supporting components considers irradiation, temperature, spectral profiles, cost and other practical constraints to achieve the lowest levelized cost of electricity, maximum output and minimum system cost. The system and method can function using any device enabling distributed maximum power point tracking at the module, string or combiner level.
    Type: Application
    Filed: June 28, 2012
    Publication date: January 2, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Bex George Thomas, Ahmed Elasser, Srinivas Bollapragada, Anthony William Galbraith, Mohammed Agamy, Maxim Valeryevich Garifullin
  • Publication number: 20130323873
    Abstract: A thyristor device includes a semiconductor body and a conductive anode. The semiconductor body has a plurality of doped layers forming a plurality of dopant junctions and includes an optical thyristor, a first amplifying thyristor, and a switching thyristor. The conductive anode is disposed on a first side of the semiconductor body. The optical thyristor is configured to receive incident radiation to generate a first electric current, and the first amplifying thyristor is configured to increase the first electric current from the optical thyristor to at least a threshold current. The switching thyristor switches to the conducting state in order to conduct a second electric current from the anode and through the semiconductor body.
    Type: Application
    Filed: August 7, 2013
    Publication date: December 5, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: AHMED ELASSER, STEPHEN DALEY ARTHUR, ALEXEY VERT, STANISLAV IVANOVICH SOLOVIEV, PETER ALMERN LOSEE