Patents by Inventor Sriram Changali
Sriram Changali 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: 8350509Abstract: A switching system includes a plurality of diodes forming a diode bridge, and a micro-mechanical system (MEMS) switch array closely coupled to the plurality of diodes. The MEMS switch array is electrically connected in an (M×N) array. The (M×N) array includes a first MEMS switch leg electrically connected in parallel with a second MEMS switch leg. The first MEMS switch leg includes a first plurality of MEMS dies electrically connected in series, and the second MEMS switch leg includes a second plurality of MEMS dies electrically connected in series.Type: GrantFiled: January 4, 2011Date of Patent: January 8, 2013Assignee: General Electric CompanyInventors: Pradeep Kumar Anand, Sriram Changali, John Kenneth Hooker, Remesh Kumar Keeramthode, Brent Charles Kumfer
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Publication number: 20120169266Abstract: A switching system includes a plurality of diodes forming a diode bridge, and a micro-mechanical system (MEMS) switch array closely coupled to the plurality of diodes. The MEMS switch array is electrically connected in an (M×N) array. The (M×N) array includes a first MEMS switch leg electrically connected in parallel with a second MEMS switch leg. The first MEMS switch leg includes a first plurality of MEMS dies electrically connected in series, and the second MEMS switch leg includes a second plurality of MEMS dies electrically connected in series.Type: ApplicationFiled: January 4, 2011Publication date: July 5, 2012Applicant: GENERAL ELECTRIC COMPANYInventors: Pradeep Kumar Anand, Sriram Changali, John Kenneth Hooker, Remesh Kumar Keeramthode, Brent Charles Kumfer
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Patent number: 8207742Abstract: An improved method to detect and locate electrical faults is provided. A method of operating a circuit breaker in an electrical circuit configured with at least one of a first main circuit breaker at a first layer of circuit protection having a first direction of current flow, and at least one second circuit breaker downstream of said at least one first main circuit breaker having a second direction of current flow, and at least one third circuit breaker downstream of said at least one second circuit breaker having a third direction of current flow, wherein one of said at least one first, second, or third circuit breakers is in short time pick-up, is provided, and comprises steps to determine the location of the fault and adjust the trip time delay of the circuit breakers according to predetermined criteria.Type: GrantFiled: December 31, 2008Date of Patent: June 26, 2012Assignee: General Electric CompanyInventors: Anupam Vinodkumar Sawhney, Sriram Changali, Radoslaw Narel, Marcelo Esteban Valdes
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Patent number: 8170816Abstract: An apparatus to perform parallel arc fault current interruption (AFCI) is provided. The apparatus includes a current sensing device disposed in the electrical circuit, a detection unit configured to receive an output signal produced by the current sensing device and to output a secondary signal based on the output signal, a microcontroller coupled to the detection unit, configured to receive and to decompose the secondary signal via discrete wavelet transforms to thereby obtain discrete wavelet coefficients, to compute a sum of the discrete wavelet coefficients, and to compare the sum of the discrete wavelet coefficients to a predetermined threshold, and to generate a trip signal when the sensed load current is above a predetermined threshold and the sum of the discrete wavelet coefficients cooperatively indicate that predetermined threshold conditions are satisfied.Type: GrantFiled: December 29, 2008Date of Patent: May 1, 2012Assignee: General Electric CompanyInventors: Sriram Changali, John Kenneth Hooker, Konstantin V. Grigoryan, Scott Jeffrey Hall
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Patent number: 8159793Abstract: An apparatus for facilitating interruption of current in an electrical circuit is provided and includes a current sensing device in the electrical circuit to service an electrical load, the current sensing device being productive of an output signal representative of a load current passing therethrough, a detection unit, in signal communication with the current sensing device such that the output signal is received by the detection unit, the detection unit being configured and disposed to output a secondary signal based on the output signal, and a microcontroller to receive and to decompose the secondary signal into detailed and approximate coefficients, and to generate a trip signal for use in interrupting an operation of the electrical circuit when a current of the sensed load is above a predetermined threshold and the detailed and approximate coefficients cooperatively indicate that threshold conditions for trip signal generation are satisfied.Type: GrantFiled: December 22, 2008Date of Patent: April 17, 2012Assignee: General Electric CompanyInventors: Scott Jeffrey Hall, John Kenneth Hooker, Konstantin Vladimir Grigoryan, Sriram Changali
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Patent number: 8054591Abstract: An apparatus to perform series and parallel arc fault current interruption (AFCI). The apparatus includes a resistive element configured to sense a load from which a current signal is generated, a first detection unit configured to output a first signal based on the current signal, and a microcontroller configured to decompose at least the first signal via discrete wavelet transforms to thereby obtain discrete wavelet coefficients, and to generate a trip signal when the discrete wavelet coefficients indicate that a threshold condition for trip signal generation are satisfied.Type: GrantFiled: July 24, 2008Date of Patent: November 8, 2011Assignee: General Electric CompanyInventors: Sriram Changali, John Kenneth Hooker, Konstantin Vladimir Grigoryan, Scott Jeffrey Hall
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Publication number: 20100164503Abstract: An improved method to detect and locate electrical faults is provided. A method of operating a circuit breaker in an electrical circuit configured with at least one of a first main circuit breaker at a first layer of circuit protection having a first direction of current flow, and at least one second circuit breaker downstream of said at least one first main circuit breaker having a second direction of current flow, and at least one third circuit breaker downstream of said at least one second circuit breaker having a third direction of current flow, wherein one of said at least one first, second, or third circuit breakers is in short time pick-up, is provided, and comprises steps to determine the location of the fault and adjust the trip time delay of the circuit breakers according to predetermined criteria.Type: ApplicationFiled: December 31, 2008Publication date: July 1, 2010Inventors: Anupam Vinodkumar Sawhney, Sriram Changali, Radoslaw Narel, Marcelo Esteban Valdes
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Publication number: 20100165521Abstract: An apparatus to perform parallel arc fault current interruption (AFCI).Type: ApplicationFiled: December 29, 2008Publication date: July 1, 2010Inventors: Sriram CHANGALI, John Kenneth Hooker, Konstantin V. Grigoryan, Scott Jeffrey Hall
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Publication number: 20100157488Abstract: An apparatus for facilitating interruption of current in an electrical circuit is provided and includes a current sensing device in the electrical circuit to service an electrical load, the current sensing device being productive of an output signal representative of a load current passing therethrough, a detection unit, in signal communication with the current sensing device such that the output signal is received by the detection unit, the detection unit being configured and disposed to output a secondary signal based on the output signal, and a microcontroller to receive and to decompose the secondary signal into detailed and approximate coefficients, and to generate a trip signal for use in interrupting an operation of the electrical circuit when a current of the sensed load is above a predetermined threshold and the detailed and approximate coefficients cooperatively indicate that threshold conditions for trip signal generation are satisfied.Type: ApplicationFiled: December 22, 2008Publication date: June 24, 2010Applicant: General Electric CompanyInventors: Scott Jeffrey Hall, John Kenneth Hooker, Konstantin Vladimir Grigoryan, Sriram Changali
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Publication number: 20100020451Abstract: An apparatus to perform series and parallel arc fault current interruption (AFCI). The apparatus includes a resistive element configured to sense a load from which a current signal is generated, a first detection unit configured to output a first signal based on the current signal, and a microcontroller configured to decompose at least the first signal via discrete wavelet transforms to thereby obtain discrete wavelet coefficients, and to generate a trip signal when the discrete wavelet coefficients indicate that a threshold condition for trip signal generation are satisfied.Type: ApplicationFiled: July 24, 2008Publication date: January 28, 2010Applicant: General Electric CompanyInventors: Sriram Changali, John Kenneth Hooker, Konstantin Vladimir Grigoryan, Scott Jeffrey Hall
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Publication number: 20090171603Abstract: A method of detecting a series arc fault in an alternating current electrical signal is provided. A method for detecting a series arc fault in an alternating current electrical signal, comprising: a) calculating discrete wavelet coefficients using a current signal as an input for the discrete wavelet coefficient calculations, and outputting discrete wavelet coefficient filtered output; b) subsampling the discrete wavelet coefficient filtered output and outputting a subsampled output; c) calculating critical variables from the subsampled output; d) determining from the critical variables whether a series arc fault is present in the current signal; and e) outputting an signal indicating that a series arc fault is present in the current signal, if substantially all of the critical variables meet a predetermined criteria.Type: ApplicationFiled: December 28, 2007Publication date: July 2, 2009Inventors: Sriram Changali, Vljaysai Prasad, Cecil Rivers, JR., Pradeep Vijayan
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Publication number: 20090168277Abstract: A circuit interrupter for interrupting alternating current electrical signal on a line conductor of a circuit feeding a load, including: an electrical contact in operatively connected in series with the line conductor; a trip mechanism for selectively opening the electrical contact when activated; a current sensor connected in series with the line conductor for obtaining a sample alternating current electrical signal from the circuit feeding the load; a microprocessor in electrical communication with the trip mechanism and comprising a series arc fault detection program resident thereon; the series arc detection program comprising a discrete wavelet transform for determining the presence of a series arc fault current in the circuit feeding the load; wherein, when the discrete wavelet transform determines the presence of a series arc fault, the microprocessors signals the trip mechanism to activate and open the electrical contact in operatively connected in series with the line conductor.Type: ApplicationFiled: December 28, 2007Publication date: July 2, 2009Inventors: Sriram Changali, Vijaysai Prasad, Cecil Rivers,, JR., Pradeep Vijayan