Patents by Inventor Suresh C. Gupta
Suresh C. Gupta 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: 6998728Abstract: An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During the power out mode, current data is sensed and is used for current limit and/or power balancing.Type: GrantFiled: October 3, 2003Date of Patent: February 14, 2006Assignee: Elliott Energy Systems, Inc.Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Patent number: 6989610Abstract: An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs the AC output circuit, electrical power having a frequency unrelated to the rotation speed of the alternator.Type: GrantFiled: May 28, 2003Date of Patent: January 24, 2006Assignee: Elliott Energy Systems, Inc.Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Patent number: 6956301Abstract: An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit and power line. During the power output mode the power line is monitored and the output voltage, frequency and/or phase is matched or synchronized to the power line.Type: GrantFiled: October 3, 2003Date of Patent: October 18, 2005Assignee: Elliott Energy Systems, Inc.Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Patent number: 6911742Abstract: An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During start-up the frequency and voltage of the electrical power to the inverter is controlled as a function of the time and/or rotation speed.Type: GrantFiled: October 3, 2003Date of Patent: June 28, 2005Assignee: Elliott Energy Systems, Inc.Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Patent number: 6909199Abstract: An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During the power out mode, output voltage is continuously measured and the inverter circuit is controlled to compensate for output voltage fluctuations.Type: GrantFiled: October 3, 2003Date of Patent: June 21, 2005Assignee: Elliott Energy Systems, Inc.Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Patent number: 6891282Abstract: An electrical system and apparatus for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. The operating parameters of the turbine are monitored during start-up and/or the power out mode.Type: GrantFiled: October 3, 2003Date of Patent: May 10, 2005Assignee: Elliott Energy Systems, Inc.Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Publication number: 20040090211Abstract: An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During the power out mode, output voltage is continuously measured and the inverter circuit is controlled to compensate for output voltage fluctuations.Type: ApplicationFiled: October 3, 2003Publication date: May 13, 2004Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Publication number: 20040066175Abstract: An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During start-up the frequency and voltage of the electrical power to the inverter is controlled as a function of the time and/or rotation speed.Type: ApplicationFiled: October 3, 2003Publication date: April 8, 2004Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Publication number: 20040066177Abstract: An electrical system and apparatus for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. The operating parameters of the turbine are monitored during start-up and/or the power out mode.Type: ApplicationFiled: October 3, 2003Publication date: April 8, 2004Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Publication number: 20040066176Abstract: An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During the power out mode, current data is sensed and is used for current limit and/or power balancing.Type: ApplicationFiled: October 3, 2003Publication date: April 8, 2004Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Publication number: 20030189339Abstract: An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs the AC output circuit, electrical power having a frequency unrelated to the rotation speed of the alternator.Type: ApplicationFiled: May 28, 2003Publication date: October 9, 2003Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Patent number: 6605928Abstract: An electrical system for a turbine/alternator comprising a gas driven turbine and permanent magnet alternator rotating on a common shaft comprises an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs to the AC output circuit, electrical power having a frequency unrelated to the rotational speed of the alternator.Type: GrantFiled: April 23, 2001Date of Patent: August 12, 2003Assignee: Elliott Energy Systems, Inc.Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Publication number: 20020070716Abstract: An electrical system for a turbine/alternator comprising a gas driven turbine and permanent magnet alternator rotating on a common shaft comprises an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs to the AC output circuit, electrical power having a frequency unrelated to the rotational speed of the alternator.Type: ApplicationFiled: April 23, 2001Publication date: June 13, 2002Inventors: Suresh C. Gupta, Douglas R. Burnham, J. Michael Teets, Jon W. Teets
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Patent number: 5610805Abstract: A power supply typology in which the pulse width modulated invertor switches serve two functions; conversion of the a.c. input to a d.c. rail voltage in addition to inversion of the d.c. rail voltage to a regulated a.c. output. An a.c. input ground terminal is connected to a node between two of the invertor switches and this node is also connected to the a.c. output to provide a common ground between the a.c. input and the a.c. output. A silicon control rectifier switch and one of the invertor switches connected to the ground node connect the back-up battery to the a.c. source during positive half cycles of the a.c. input in order to maintain a charge on the back-up battery.Type: GrantFiled: January 10, 1995Date of Patent: March 11, 1997Assignee: Cambridge Continuous PowerInventor: Suresh C. Gupta
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Patent number: 5087872Abstract: A circulating load apparatus for loading a power supply. The power supply has a power input terminal, a power output terminal and a power return terminal. The power supply provides an output voltage at the power output terminal with respect to the power return terminal. The output voltage of the power supply is controlled to be substantially identical in amplitude to the network voltage of a network source, provided at a network source terminal with respect to a source return terminal. The power supply, power return terminal is coupled to the network source, source return terminal. The power supply power input terminal is coupled to the network source terminal to be powered by voltage and current from the network source terminal. The circulating load apparatus has a voltage source for supplying a voltage between a first and second terminal. The voltage source is connected in series between the network source terminal and the power supply power output terminal.Type: GrantFiled: February 13, 1990Date of Patent: February 11, 1992Assignee: Deltec Electronics CorporationInventor: Suresh C. Gupta
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Patent number: 4575671Abstract: Methods and apparatus are disclosed for synchronizing multiple AC motor driven synchronous generators to the voltage on a common output bus. In one method, the rotating motor is disconnected from its AC power source, the generator voltage is phase synchronized to the output bus voltage, and then the generator rotor is caused to slip one generator pole at a time until the motor generated voltage is phase synchronized to the AC power source voltage. At that point, the motor is reconnected to the AC power source. Other methods are disclosed in which magnetic position sensors are employed to provide an indication of when the rotors on multiple motor driven generators are mechanically phase synchronized.Type: GrantFiled: February 14, 1984Date of Patent: March 11, 1986Assignee: Teledyne Industries, Inc.Inventors: Robert H. Lee, Suresh C. Gupta