Patents by Inventor Ramesh Selvaraj
Ramesh Selvaraj 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: 11943851Abstract: Described herein are systems and methods for generating short load current pulses using an H-bridge. In various embodiments, this is accomplished by controlling, in a shunting mode, a low-side switch of the H-bridge to drive a first average current and controlling, in a non-shunting mode, a high-side switch of the H-bridge to drive a second average current such that the first and second average currents are substantially the same and reduce a current pulse width of the load current.Type: GrantFiled: August 4, 2022Date of Patent: March 26, 2024Assignee: Maxim Integrated Products, Inc.Inventors: Suresh Hariharan, Ron Vincent Ocampo, Ramesh Selvaraj
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Patent number: 11737190Abstract: The present disclosure relates generally to systems and methods for transient response improvements in electrical circuits. More particularly, the present disclosure relates to systems and methods for suppressing overshoot currents and overshoot durations in circuits using switching regulators, such as driver circuits for LED applications. Embodiments of the invention relate to an LED driver that utilizes transient suppression systems and method for LED applications.Type: GrantFiled: July 13, 2021Date of Patent: August 22, 2023Assignee: Maxim Integrated Products, Inc.Inventors: Suresh Hariharan, Ron Vincent Ocampo, Ramesh Selvaraj
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Publication number: 20230247741Abstract: Described are light emitting diode (LED) and non-LED driver systems and methods that reduce current overshoot and, deadtime, and other undesirable effects in applications such as adaptive driving beam headlamp application that negatively impact circuit parameters, including efficiency. In certain embodiments, this is accomplished by using a current clamp circuit that is controlled such as to limit an overshoot in load current, e.g., when a number of LEDs that are turned on changes.Type: ApplicationFiled: December 24, 2022Publication date: August 3, 2023Applicant: Maxim Integrated Products, Inc.Inventors: Suresh Hariharan, Ron Vincent Ocampo, Ramesh Selvaraj
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Patent number: 11665800Abstract: Described herein are systems and methods for operating DC-DC regulators such as LED drivers. Various embodiments herein allow a DC-DC regulator to switch between buck mode and buck-boost mode without suffering effects otherwise resulting from transient currents when switching between modes. In certain embodiments, this is accomplished by operating the DC-DC regulator in a buck-boost mode to charge a boost capacitor with a substantially constant inductor current. The inductor current is also used to control a set of switches to operate the DC-DC regulator in a buck mode to drive a load by using the capacitor as a power source.Type: GrantFiled: December 16, 2021Date of Patent: May 30, 2023Assignee: Maxim Integrated Products Inc.Inventors: Suresh Hariharan, Gregory Michael Fattig, Ramesh Selvaraj, Ron Vincent Ocampo
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Publication number: 20230041463Abstract: Described herein are systems and methods for generating short load current pulses using an H-bridge. In various embodiments, this is accomplished by controlling, in a shunting mode, a low-side switch of the H-bridge to drive a first average current and controlling, in a non-shunting mode, a high-side switch of the H-bridge to drive a second average current such that the first and second average currents are substantially the same and reduce a current pulse width of the load current.Type: ApplicationFiled: August 4, 2022Publication date: February 9, 2023Applicant: Maxim Integrated Products, Inc.Inventors: Suresh HARIHARAN, Ron Vincent OCAMPO, Ramesh SELVARAJ
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Publication number: 20220264721Abstract: Described herein are systems and methods for operating DC-DC regulators such as LED drivers. Various embodiments herein allow a DC-DC regulator to switch between buck mode and buck-boost mode without suffering effects otherwise resulting from transient currents when switching between modes. In certain embodiments, this is accomplished by operating the DC-DC regulator in a buck-boost mode to charge a boost capacitor with a substantially constant inductor current. The inductor current is also used to control a set of switches to operate the DC-DC regulator in a buck mode to drive a load by using the capacitor as a power source.Type: ApplicationFiled: December 16, 2021Publication date: August 18, 2022Applicant: Maxim Integrated Products, Inc.Inventors: Suresh HARIHARAN, Gregory Michael FATTIG, Ramesh SELVARAJ, Ron Vincent OCAMPO
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Publication number: 20220039236Abstract: The present disclosure relates generally to systems and methods for transient response improvements in electrical circuits. More particularly, the present disclosure relates to systems and methods for suppressing overshoot currents and overshoot durations in circuits using switching regulators, such as driver circuits for LED applications. Embodiments of the invention relate to an LED driver that utilizes transient suppression systems and method for LED applications.Type: ApplicationFiled: July 13, 2021Publication date: February 3, 2022Applicant: Maxim Integrated Products, Inc.Inventors: Suresh HARIHARAN, Ron Vincent OCAMPO, Ramesh SELVARAJ
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Patent number: 11123415Abstract: The present disclosure relates to nanoparticle compositions for use as vaccines against Salmonella.Type: GrantFiled: August 16, 2018Date of Patent: September 21, 2021Assignee: Ohio State Innovation FoundationInventors: Renukaradhya Gourapura, Ramesh Selvaraj, Sankar Renu
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Publication number: 20210093705Abstract: The present disclosure relates to nanoparticle compositions for use as vaccines against Salmonella. Disclosed herein is a composition comprising: a Salmonella enteritidis outer membrane protein (OMP) or Salmonella enteritidis killed whole antigenic extracted (KAg) protein; and a polyanhydride or chitosan nanoparticle. In some embodiments, the nanoparticle further comprises flagellar protein. Disclosed herein is a vaccine comprising: a composition comprising a Salmonella enteritidis OMP protein or Salmonella enteritidis killed whole antigenic extracted (KAg) protein; a polyanhydride or chitosan nanoparticle; and a pharmaceutically acceptable carrier.Type: ApplicationFiled: August 16, 2018Publication date: April 1, 2021Inventors: Renukaradhya GOURAPURA, Ramesh SELVARAJ, Sankar RENU
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Patent number: 9158744Abstract: A system, a computer-implemented method and a computer program product for extracting insurance data from one or more documents having one or more file formats and converting into Extensible Markup Language (XML) format is provided. The system comprises a user interface configured to facilitate one or more users to submit one or more documents related to insurance. The system further comprises a business type classification module configured to identify the one or more submitted documents based on a business type. Further, the system comprises a format classification module configured to identify file format of the one or more submitted documents. Furthermore, the system comprises an extraction and conversion module configured to match one or more headers in the one or more submitted documents with one or more pre-stored headers, extract insurance data corresponding to the one or more matched headers and convert the extracted insurance data into XML format.Type: GrantFiled: March 13, 2013Date of Patent: October 13, 2015Assignee: Cognizant Technology Solutions India Pvt. Ltd.Inventors: Geelapaturu Subrahmanya Venkata Radha Krishna Rao, Parthasarathi Jinka, Venkatesh Srinivasan, Ramesh Selvaraj, Suresh Kumar Ramaswamy, Dinesh Maroo
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Publication number: 20140195891Abstract: A system, a computer-implemented method and a computer program product for extracting insurance data from one or more documents having one or more file formats and converting into Extensible Markup Language (XML) format is provided. The system comprises a user interface configured to facilitate one or more users to submit one or more documents related to insurance. The system further comprises a business type classification module configured to identify the one or more submitted documents based on a business type. Further, the system comprises a format classification module configured to identify file format of the one or more submitted documents. Furthermore, the system comprises an extraction and conversion module configured to match one or more headers in the one or more submitted documents with one or more pre-stored headers, extract insurance data corresponding to the one or more matched headers and convert the extracted insurance data into XML format.Type: ApplicationFiled: March 13, 2013Publication date: July 10, 2014Applicant: Cognizant Technology Solutions India Pvt. Ltd.Inventors: Geelapaturu Subrahmanya Venkata Radha Krishna Rao, Parthasarathi Jinka, Venkatesh Srinivasan, Ramesh Selvaraj, Suresh Kumar Ramaswamy, Dinesh Maroo
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Patent number: 7471071Abstract: One embodiment of the invention is a hybrid boost regulator that includes a conventional boost regulator chip that operates when its input voltage is above 2.5 volts and a pre-boost circuit that operates when its input voltage is above 1 volt. A single 1.5 volt battery may be used to power the hybrid boost regulator. The pre-boost circuit is connected to the voltage input terminal of the boost regulator chip. The pre-boost circuit boosts the battery voltage (e.g., 1.5v) at an output terminal of the hybrid boost regulator to approximately the minimum operating voltage (e.g., 2.5v) of the boost regulator chip. Since this pre-boosted voltage is applied to the voltage input terminal of the boost regulator chip, the boost regulator chip will become operational when the ramping output voltage of the hybrid boost regulator exceeds about 2.5 volts. Once the boost regulator chip is operational, the pre-boost circuit is then turned off, and the boost regulator chip runs off the 1.Type: GrantFiled: November 28, 2006Date of Patent: December 30, 2008Assignee: Micrel, Inc.Inventors: Wendy Ng, Charles Vinn, Ramesh Selvaraj
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Publication number: 20080122417Abstract: One embodiment of the invention is a hybrid boost regulator that includes a conventional boost regulator chip that operates when its input voltage is above 2.5 volts and a pre-boost circuit that operates when its input voltage is above 1 volt. A single 1.5 volt battery may be used to power the hybrid boost regulator. The pre-boost circuit is connected to the voltage input terminal of the boost regulator chip. The pre-boost circuit boosts the battery voltage (e.g., 1.5 v) at an output terminal of the hybrid boost regulator to approximately the minimum operating voltage (e.g., 2.5 v) of the boost regulator chip. Since this pre-boosted voltage is applied to the voltage input terminal of the boost regulator chip, the boost regulator chip will become operational when the ramping output voltage of the hybrid boost regulator exceeds about 2.5 volts. Once the boost regulator chip is operational, the pre-boost circuit is then turned off, and the boost regulator chip runs off the 1.Type: ApplicationFiled: November 28, 2006Publication date: May 29, 2008Applicant: MICREL, INC.Inventors: Wendy Ng, Charles Vinn, Ramesh Selvaraj
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Patent number: 7215108Abstract: A method for starting up a voltage-mode switching power supply into a biased load includes computing a ratio of the load voltage at the biased load to an input voltage of the switching power supply, generating a first signal indicative of the duty cycle of the voltage-mode switching power supply, comparing the first signal indicative of the duty cycle to the ratio, and turning on an output stage of the voltage-mode switching power supply only when the first signal indicative of the duty cycle is equal to the ratio. In this manner, the voltage-mode switching power supply can be started up to supply power to a biased load without dragging down the load voltage of the biased load.Type: GrantFiled: January 14, 2005Date of Patent: May 8, 2007Assignee: Micrel, Inc.Inventors: Bruce L. Inn, Ramesh Selvaraj
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Publication number: 20060158169Abstract: A method for starting up a voltage-mode switching power supply into a biased load includes computing a ratio of the load voltage at the biased load to an input voltage of the switching power supply, generating a first signal indicative of the duty cycle of the voltage-mode switching power supply, comparing the first signal indicative of the duty cycle to the ratio, and turning on an output stage of the voltage-mode switching power supply only when the first signal indicative of the duty cycle is equal to the ratio. In this manner, the voltage-mode switching power supply can be started up to supply power to a biased load without dragging down the load voltage of the biased load.Type: ApplicationFiled: January 14, 2005Publication date: July 20, 2006Inventors: Bruce Inn, Ramesh Selvaraj
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Patent number: 7002263Abstract: In master-slave current-tracking load-share systems using switching power supplies, a method and apparatus for preventing current recirculation at light-load and no-load operational conditions. The slave power supply is run in a discontinuous mode when load current falls to light-load or no-load state, preventing the slave from sinking current, therefore preventing recirculation from the master to the slave. The slave power supply is run at a lower current level than the master, preventing recirculation from the slave to the master.Type: GrantFiled: June 9, 2004Date of Patent: February 21, 2006Assignee: Micrel, IncorporatedInventors: Bruce Inn, Ramesh Selvaraj
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Publication number: 20050275290Abstract: In master-slave current-tracking load-share systems using switching power supplies, a method and apparatus for preventing current recirculation at light-load and no-load operational conditions. The slave power supply is run in a discontinuous mode when load current falls to light-load or no-load state, preventing the slave from sinking current, therefore preventing recirculation from the master to the slave. The slave power supply is run at a lower current level than the master, preventing recirculation from the slave to the master.Type: ApplicationFiled: June 9, 2004Publication date: December 15, 2005Applicant: Micrel, IncorporatedInventors: Bruce Inn, Ramesh Selvaraj
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Patent number: 6567228Abstract: A magnetic head reader circuit comprises a gain stage that is configured to effect multiple functions. In a preferred embodiment, the gain stage is a single stage circuit that includes programmable gain, programmable bandwidth and high-frequency boost, and squelch control. The single stage circuit also includes a folded cascode current drive that provides an increased dynamic range of the gain stage. To provide a low DC offset, the reader also includes an integrator that is operated in closed loop to appropriately attenuate the currents from the cascode current drive. By employing a multi-function single stage reader, a substantial reduction in circuit area, and a substantial increase in bandwidth, is achieved.Type: GrantFiled: June 3, 2000Date of Patent: May 20, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Sanjay Manohar Bhandari, Ramesh Selvaraj
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Patent number: 6424475Abstract: A preamplifier for a multi-head disk drive includes a circuit that tests the connectivity of each magnetic head in the disk drive by driving each head with a small current, and detecting the flow of this current. By driving and sensing the current flowing through the magnetic heads, both open-circuit faults and bridging faults can be detected. In a preferred embodiment, each head is tested sequentially. The result of each test is stored as a bit value in a register, for subsequent access. The circuit may be activated by a test device, or by a microcontroller in an assembled disk drive. To minimize costs, the circuit is integral to the circuitry that is conventionally used to read and write information via the magnetic heads. The oscillator that is conventionally used to characterize the read heads of a disk drive is used in a preferred embodiment to control the sequencing of tests through each head.Type: GrantFiled: June 3, 2000Date of Patent: July 23, 2002Assignee: Koninklijke Philips Electronics N.V.Inventors: Sanjay Manohar Bhandari, Ramesh Selvaraj, Joao Nuno V. L. Ramalho, Patrick LeClerc, Eric Pieraerts