Patents by Inventor Ramanujam Ramabhadran
Ramanujam Ramabhadran 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: 9526136Abstract: An electronic driver is provided. The electronic driver includes a power converter including an output terminal and configured to generate a converter output power based on a first switching frequency of the power converter. The electronic driver also includes a first controller operatively coupled to the power converter and configured to control the first switching frequency of the power converter. The electronic driver further includes a visible light communication adapter operatively coupled to the output terminal of the power converter and configured to alter the converter output power to perform visible light communication.Type: GrantFiled: November 24, 2015Date of Patent: December 20, 2016Assignee: General Electric CompanyInventors: Ramanujam Ramabhadran, Danijel Maricic, Michael James Hartman
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Patent number: 9426854Abstract: An electronic driver for operating an illumination device is provided. The electronic driver includes a power converter configured to illuminate the illumination device. The power converter includes a switch capacitor circuit configured to perform at least one of a pulse width modulation dimming and a visible light communication using the illumination device. The switch capacitor circuit includes a plurality of split capacitors operatively coupled in series to a second end of a primary winding of a transformer in the power converter and a control switch operatively coupled to the plurality of split capacitors. The power converter also includes a controller operatively coupled to the control switch and is configured to control the control switch to perform at least one of the pulse width modulation dimming and the visible light communication.Type: GrantFiled: November 30, 2015Date of Patent: August 23, 2016Assignee: General Electric CompanyInventors: Ramanujam Ramabhadran, Eric Lavigne, Michael James Hartman, Danijel Maricic
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Publication number: 20160165684Abstract: An illumination device is provided. The illumination device includes a light emitting source, and a clamped series resonant converter operatively coupled to the light emitting source, where the clamped series resonant converter is configured to automatically regulate a load current generated by the clamped series resonant converter in response to a load voltage applied by the light emitting source.Type: ApplicationFiled: December 5, 2014Publication date: June 9, 2016Inventors: Ramanujam Ramabhadran, John Stanley Glaser
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Patent number: 9331477Abstract: A cooling system includes a synthetic jet having a first synthetic jet lead and a second synthetic jet lead. The cooling system also includes a capacitor having a first capacitor lead and a second capacitor lead. The first capacitor lead is coupled to the first synthetic jet lead. The synthetic jet is configured to be powered via an alternating current (AC) power source coupled to the second capacitor lead and to the second synthetic jet lead.Type: GrantFiled: October 22, 2013Date of Patent: May 3, 2016Assignee: General Electric CompanyInventors: Ramanujam Ramabhadran, Charles Erklin Seeley, John Stanley Glaser, Robert James Thomas, Stanton Earl Weaver, Jr.
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Publication number: 20160014858Abstract: A light emitting diode (LED) driver includes an inverter for converting a DC input signal to a pulsating signal. A multiple output multi-resonant converter generates a first LED string current in response to the pulsating signal, and also generates a second LED string current in response to the pulsating signal. A transistor that may be a FET or BJT operating in its linear region regulates the second LED string current independent of the first LED string current without sacrificing efficiency of the overall power train.Type: ApplicationFiled: July 11, 2014Publication date: January 14, 2016Inventors: RAMANUJAM RAMABHADRAN, GANG YAO
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Patent number: 9147240Abstract: A method for operating illumination sources includes receiving a first set of images of one or more illumination sources that are generated by an image capturing device. The method further includes computing a first distance and a first perspective angle between the image capturing device and each illumination source during the generation of the first set of images. Furthermore, the method includes generating first characteristic information for each illumination source based on a comparison between at least one of the first distance or the first perspective angle for each illumination source with at least one of a predefined distance or a predefined perspective angle for each illumination source. The method also includes generating a command signal based on a comparison between the first characteristic information and a predefined characteristic threshold for each of the one or more illumination sources.Type: GrantFiled: November 22, 2013Date of Patent: September 29, 2015Assignee: General Electric CompanyInventors: Danijel Maricic, Ramanujam Ramabhadran, Mohamed Cherif Ghanem
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Publication number: 20150214833Abstract: A power factor controller (PFC) for an electrical load such as LED lighting includes a power factor correcting converter for generating a sinusoidal input current. The PFC further includes a programmable controller for estimating a phase shifted multiplier. A current regulator generates a desired PFC current in response to an input voltage, an output load and the phase shifted and subsequently blanked multiplier. The electrical load operates in response to the sinusoidal input current based at least partially on the desired PFC current.Type: ApplicationFiled: January 27, 2014Publication date: July 30, 2015Applicant: GENERAL ELECTRIC COMPANYInventors: Ramanujam Ramabhadran, Gang Yao, Bruce Richard Roberts, Jeffrey Joseph Nasadoski
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Publication number: 20150146931Abstract: A method for operating illumination sources includes receiving a first set of images of one or more illumination sources that are generated by an image capturing device. The method further includes computing a first distance and a first perspective angle between the image capturing device and each illumination source during the generation of the first set of images. Furthermore, the method includes generating first characteristic information for each illumination source based on a comparison between at least one of the first distance or the first perspective angle for each illumination source with at least one of a predefined distance or a predefined perspective angle for each illumination source. The method also includes generating a command signal based on a comparison between the first characteristic information and a predefined characteristic threshold for each of the one or more illumination sources.Type: ApplicationFiled: November 22, 2013Publication date: May 28, 2015Applicant: General Electric CompanyInventors: Danijel Maricic, Ramanujam Ramabhadran, Mohamed Cherif Ghanem
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Publication number: 20150108899Abstract: A cooling system includes a synthetic jet having a first synthetic jet lead and a second synthetic jet lead. The cooling system also includes a capacitor having a first capacitor lead and a second capacitor lead. The first capacitor lead is coupled to the first synthetic jet lead. The synthetic jet is configured to be powered via an alternating current (AC) power source coupled to the second capacitor lead and to the second synthetic jet lead.Type: ApplicationFiled: October 22, 2013Publication date: April 23, 2015Applicant: General Electric CompanyInventors: Ramanujam Ramabhadran, Charles Erklin Seeley, John Stanley Glaser, Robert James Thomas, Stanton Earl Weaver, Jr.
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Publication number: 20150108924Abstract: A system for driving a piezoelectric load includes a direct current (DC) voltage source and a bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and comprising a control input configured to receive a first control signal configured to control conversion of a first voltage on the primary side of the bi-directional DC-to-DC converter to a second voltage on the secondary side of the bi-directional DC-to-DC converter. The driver system also includes a capacitor coupled to the secondary side of the bi-directional DC-to-DC converter and configured to remove a DC offset of the second voltage and includes a reactive load having a first terminal coupled to the capacitor and a second terminal coupled to the secondary side of the bi-directional DC-to-DC converter.Type: ApplicationFiled: December 30, 2014Publication date: April 23, 2015Inventors: Ramanujam Ramabhadran, John Stanley Glaser
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Patent number: 8958217Abstract: A system for driving a piezoelectric load includes a direct current (DC) voltage source and a bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and comprising a control input configured to receive a first control signal configured to control conversion of a first voltage on the primary side of the bi-directional DC-to-DC converter to a second voltage on the secondary side of the bi-directional DC-to-DC converter. The driver system also includes a capacitor coupled to the secondary side of the bi-directional DC-to-DC converter and configured to remove a DC offset of the second voltage and includes a reactive load having a first terminal coupled to the capacitor and a second terminal coupled to the secondary side of the bi-directional DC-to-DC converter.Type: GrantFiled: June 15, 2012Date of Patent: February 17, 2015Assignee: General Electric CompanyInventors: Ramanujam Ramabhadran, John Stanley Glaser
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Publication number: 20150022056Abstract: A driver system comprises a direct current (DC) voltage source and a first bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and configured to convert a first voltage on the primary side to a second voltage on the secondary. The driver system also comprises a second bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side coupled to the secondary side of the first bi-directional DC-to-DC converter and configured to convert the first voltage on the primary side to a third voltage on the secondary. The first and second bi-directional DC-to-DC converters are capable of boosting the first voltage, and the second control signal is a complement of the first control signal. A voltage difference between the second and third voltages comprises an output voltage that comprises an amplification of the first control signal.Type: ApplicationFiled: October 6, 2014Publication date: January 22, 2015Inventors: John Stanley Glaser, Ramanujam Ramabhadran
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Publication number: 20150002025Abstract: In accordance with one embodiment, a lighting assembly is provided. The lighting assembly includes a first light unit configured to operate at a first duty cycle and a second light unit configured to operate at a second duty cycle. The second duty cycle is less than the first duty cycle, and the first and second light units emit light having a same wavelength.Type: ApplicationFiled: June 28, 2013Publication date: January 1, 2015Inventors: Danijel Maricic, Ramanujam Ramabhadran, John Thomas Garrity
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Patent number: 8896182Abstract: A driver system comprises a direct current (DC) voltage source and a first bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and configured to convert a first voltage on the primary side to a second voltage on the secondary. The driver system also comprises a second bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side coupled to the secondary side of the first bi-directional DC-to-DC converter and configured to convert the first voltage on the primary side to a third voltage on the secondary. The first and second bi-directional DC-to-DC converters are capable of boosting the first voltage, and the second control signal is a complement of the first control signal. A voltage difference between the second and third voltages comprises an output voltage that comprises an amplification of the first control signal.Type: GrantFiled: April 5, 2012Date of Patent: November 25, 2014Assignee: General Electric CorporationInventors: John Stanley Glaser, Ramanujam Ramabhadran
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Publication number: 20130336035Abstract: A system for driving a piezoelectric load includes a direct current (DC) voltage source and a bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and comprising a control input configured to receive a first control signal configured to control conversion of a first voltage on the primary side of the bi-directional DC-to-DC converter to a second voltage on the secondary side of the bi-directional DC-to-DC converter. The driver system also includes a capacitor coupled to the secondary side of the bi-directional DC-to-DC converter and configured to remove a DC offset of the second voltage and includes a reactive load having a first terminal coupled to the capacitor and a second terminal coupled to the secondary side of the bi-directional DC-to-DC converter.Type: ApplicationFiled: June 15, 2012Publication date: December 19, 2013Inventors: Ramanujam Ramabhadran, John Stanley Glaser
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Publication number: 20130264909Abstract: A driver system comprises a direct current (DC) voltage source and a first bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side and configured to convert a first voltage on the primary side to a second voltage on the secondary. The driver system also comprises a second bi-directional DC-to-DC converter having a primary side coupled to the DC voltage source and a secondary side coupled to the secondary side of the first bi-directional DC-to-DC converter and configured to convert the first voltage on the primary side to a third voltage on the secondary. The first and second bi-directional DC-to-DC converters are capable of boosting the first voltage, and the second control signal is a complement of the first control signal. A voltage difference between the second and third voltages comprises an output voltage that comprises an amplification of the first control signal.Type: ApplicationFiled: April 5, 2012Publication date: October 10, 2013Inventors: John Stanley Glaser, Ramanujam Ramabhadran
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Patent number: 7274575Abstract: A switching power system for converting an input voltage to an output voltage across a transformer is disclosed. The system includes a control circuit. The control circuit has a control input coupled for receiving the output voltage and an output coupled to a primary winding of the transformer. The system includes a bias circuit for supplying an operating voltage to the control circuit. The bias circuit includes a capacitor. The capacitor has a first terminal coupled to a first terminal of a first secondary winding of the transformer. A first diode is coupled between a second terminal of the first secondary winding and a second terminal of the first capacitor. A second diode is coupled between the second terminal of the capacitor and a bias input of the control circuit. A method of making the same is disclosed.Type: GrantFiled: August 5, 2005Date of Patent: September 25, 2007Assignee: Power-One, Inc.Inventors: Ramanujam Ramabhadran, David A. Williams
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Publication number: 20070030704Abstract: A switching power system for converting an input voltage to an output voltage across a transformer is disclosed. The system includes a control circuit. The control circuit has a control input coupled for receiving the output voltage and an output coupled to a primary winding of the transformer. The system includes a bias circuit for supplying an operating voltage to the control circuit. The bias circuit includes a capacitor. The capacitor has a first terminal coupled to a first terminal of a first secondary winding of the transformer. A first diode is coupled between a second terminal of the first secondary winding and a second terminal of the first capacitor. A second diode is coupled between the second terminal of the capacitor and a bias input of the control circuit. A method of making the same is disclosed.Type: ApplicationFiled: August 5, 2005Publication date: February 8, 2007Inventors: Ramanujam Ramabhadran, David Williams
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Patent number: 7009849Abstract: A multiple output converter, and related method of operation thereof, that includes a primary output and at least one auxiliary output. In one embodiment, the multiple output converter includes a transformer having a primary winding and at least one secondary winding. The multiple output converter also includes a switch, coupled to the primary winding, that impresses an input voltage across the transformer. A first output voltage of the multiple output converter is produced at the primary output via a magnetizing inductance associated with the transformer. The multiple output converter still further includes an output inductor coupled to the at least one secondary winding. A second output voltage of the multiple output converter is produced at the auxiliary output via the output inductor.Type: GrantFiled: October 28, 2003Date of Patent: March 7, 2006Assignee: Tyco Electronics Power Systems, Inc.Inventors: Ramanujam Ramabhadran, Karim N. Wassef
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Publication number: 20050088854Abstract: A multiple output converter, and related method of operation thereof, that includes a primary output and at least one auxiliary output. In one embodiment, the multiple output converter includes a transformer having a primary winding and at least one secondary winding. The multiple output converter also includes a switch, coupled to the primary winding, that impresses an input voltage across the transformer. A first output voltage of the multiple output converter is produced at the primary output via a magnetizing inductance associated with the transformer. The multiple output converter still further includes an output inductor coupled to the at least one secondary winding. A second output voltage of the multiple output converter is produced at the auxiliary output via the output inductor.Type: ApplicationFiled: October 28, 2003Publication date: April 28, 2005Applicant: Tyco Electronics Power Systems, Inc. A Nevada CorporationInventors: Ramanujam Ramabhadran, Karim Wassef