Patents by Inventor Kaustuva Acharya
Kaustuva Acharya 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: 11625707Abstract: This disclosure describes systems and techniques for enabling a communication device to communicate wirelessly with a near-field-communication (NFC)-enabled payment terminal while avoiding interference between the NFC-enabled payment terminal and other NFC payment instruments. In some instances, the communication device may receive, via a non-NFC communication protocol, a payment token from an identification device and may send, over NFC, the payment token to the NFC-enabled payment terminal for satisfying the cost of a transaction.Type: GrantFiled: April 27, 2020Date of Patent: April 11, 2023Assignee: Amazon Technologies, Inc.Inventors: Benjamin Blake Macy, Sora Kim, Kaustuva Acharya, Jacob Francis Garstki
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Patent number: 10356869Abstract: External programming of at least one processor (30) of a LED driver (10). In a normal operation mode a first control input (22B/22C) of the LED driver (10) may be provided to a first processor input of the processor and a second control input (22B/22C) of the LED driver may be provided to a second processor input of the processor (30). In a programming mode the first and second control inputs (22B, 22C) may be provided to programming inputs of the processor (30) to thereby enable programming of the processor (30) via the first and second control inputs (22B, 22C).Type: GrantFiled: January 12, 2017Date of Patent: July 16, 2019Assignee: SIGNIFY HOLDING B.V.Inventors: Raman Nair Harish Gopala Pillai, Kaustuva Acharya
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Publication number: 20170142799Abstract: External programming of at least one processor (30) of a LED driver (10). In a normal operation mode a first control input (22B/22C) of the LED driver (10) may be provided to a first processor input of the processor and a second control input (22B/22C) of the LED driver may be provided to a second processor input of the processor (30). In a programming mode the first and second control inputs (22B, 22C) may be provided to programming inputs of the processor (30) to thereby enable programming of the processor (30) via the first and second control inputs (22B, 22C).Type: ApplicationFiled: January 12, 2017Publication date: May 18, 2017Inventors: Raman Nair HARISH GOPALA PILLAI, Kaustuva ACHARYA
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Patent number: 9606523Abstract: External programming of at least one processor (30) of a LED driver (10). In a normal operation mode a first control input (22B/22C) of the LED driver (10) may be provided to a first processor input of the processor and a second control input (22B/22C) of the LED driver may be provided to a second processor input of the processor (30). In a programming mode the first and second control inputs (22B, 22C) may be provided to programming inputs of the processor (30) to thereby enable programming of the processor (30) via the first and second control inputs (22B, 22C).Type: GrantFiled: April 2, 2013Date of Patent: March 28, 2017Assignee: PHILIPS LIGHTING HOLDING B.V.Inventors: Raman Nair Harish Gopala Pillai, Kaustuva Acharya
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Patent number: 9301347Abstract: A programmable driver for driving a solid state lighting device includes a processing circuit, a voltage feedback loop and a power stage. The processing circuit is configured to determine a voltage reference signal based on a nominal current setting and a predetermined power limit. The voltage feedback loop is configured to receive the voltage reference signal and to determine a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the solid state lighting device. The power stage is configured to limit maximum output voltage for driving the solid state lighting device based at least in part on the determined difference between the reference voltage and the drive voltage of the solid state lighting device provided by the voltage feedback loop.Type: GrantFiled: August 30, 2012Date of Patent: March 29, 2016Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Kaustuva Acharya, Raman Nair Harish Gopala Pillai, Yimin Chen, Ajay Tripathi
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Patent number: 9198256Abstract: A light driver having a primary side driver configured to convert an input from a mains power supply to a primary side output, and a secondary side driver coupled to the primary side driver and configured to rectify and filter the primary side output to provide a driver output current for driving a light load. A microcontroller controls the light driver at start-up so that the secondary side driver is powered-on and the primary side driver is in a non-powered state during a soft-start period, and subsequent to the soft-start period the secondary side driver is set to be in a low output state when powered-on and thereafter set to a state so that driver output current of the secondary side driver increases the light output from the light load from an initial dim level to a nominal dim level without flicker.Type: GrantFiled: December 20, 2011Date of Patent: November 24, 2015Assignee: KONINKLIJKE PHILIPS N.V.Inventors: Yimin Chen, Nicholaos Hillas, Ajay Tripathi, Kaustuva Acharya, Raman Nair Harish Gopala Pillai
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Publication number: 20150094827Abstract: External programming of at least one processor (30) of a LED driver (10). In a normal operation mode a first control input (22B/22C) of the LED driver (10) may be provided to a first processor input of the processor and a second control input (22B/22C) of the LED driver may be provided to a second processor input of the processor (30). In a programming mode the first and second control inputs (22B, 22C) may be provided to programming inputs of the processor (30) to thereby enable programming of the processor (30) via the first and second control inputs (22B, 22C).Type: ApplicationFiled: April 2, 2013Publication date: April 2, 2015Inventors: Raman Nair Harish Gopala Pillai, Kaustuva Acharya
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Patent number: 8957604Abstract: A system for implementing mains-voltage-based dimming of a solid state lighting module includes a transformer, a mains sensing circuit and a processing circuit. The transformer includes a primary side connected to a primary side circuit and a secondary side connected to a secondary side circuit, the primary and second side circuits being separated by an isolation barrier. The mains sensing circuit receives a rectified mains voltage from the primary side circuit and generates a mains sense signal indicating amplitude of the rectified mains voltage. The processing circuit receives the mains sense signal from the mains sensing circuit across the isolation barrier, and outputs a dimming reference signal to the secondary side circuit in response to the mains sense signal. Light output by the solid state lighting module, connected to the secondary side circuit, is adjusted in response to the dimming reference signal output by the processing circuit.Type: GrantFiled: July 24, 2012Date of Patent: February 17, 2015Assignee: Koninklijke Philips N.V.Inventors: Raman Nair Harish Gopala Pillai, Kaustuva Acharya, Ajay Tripathi
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Publication number: 20140285103Abstract: A programmable driver for driving a solid state lighting device includes a processing circuit, a voltage feedback loop and a power stage. The processing circuit is configured to determine a voltage reference signal based on a nominal current setting and a predetermined power limit. The voltage feedback loop is configured to receive the voltage reference signal and to determine a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the solid state lighting device. The power stage is configured to limit maximum output voltage for driving the solid state lighting device based at least in part on the determined difference between the reference voltage and the drive voltage of the solid state lighting device provided by the voltage feedback loop.Type: ApplicationFiled: August 30, 2012Publication date: September 25, 2014Inventors: Kaustuva Acharya, Raman Nair Harish Gopala Pillai, Yimin Chen, Ajay Tripathi
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Publication number: 20140176008Abstract: A system for implementing mains-voltage-based dimming of a solid state lighting module includes a transformer, a mains sensing circuit and a processing circuit. The transformer includes a primary side connected to a primary side circuit and a secondary side connected to a secondary side circuit, the primary and second side circuits being separated by an isolation barrier. The mains sensing circuit receives a rectified mains voltage from the primary side circuit and generates a mains sense signal indicating amplitude of the rectified mains voltage. The processing circuit receives the mains sense signal from the mains sensing circuit across the isolation barrier, and outputs a dimming reference signal to the secondary side circuit in response to the mains sense signal. Light output by the solid state lighting module, connected to the secondary side circuit, is adjusted in response to the dimming reference signal output by the processing circuit.Type: ApplicationFiled: July 24, 2012Publication date: June 26, 2014Applicant: KONINKLIJKE PHILIPS N.V.Inventors: Raman Nair Harish Gopala Pillai, Kaustuva Acharya, Ajay Tripathi
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Publication number: 20130271040Abstract: A light driver having a primary side driver configured to convert an input from a mains power supply to a primary side output, and a secondary side driver coupled to the primary side driver and configured to rectify and filter the primary side output to provide a driver output current for driving a light load. A microcontroller controls the light driver at start-up so that the secondary side driver is powered-on and the primary side driver is in a non-powered state during a soft-start period, and subsequent to the soft-start period the secondary side driver is set to be in a low output state when powered-on and thereafter set to a state so that driver output current of the secondary side driver increases the light output from the light load from an initial dim level to a nominal dim level without flicker.Type: ApplicationFiled: December 20, 2011Publication date: October 17, 2013Applicant: Koninklijke Philips N.V.Inventors: Yimin Chen, Nicholaos Hillas, Ajay Tripathi, Kaustuva Acharya, Raman Nair Harish Gopala Pillai
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Patent number: 7372709Abstract: Apparatus for conditioning power generated by an energy source includes an inverter for converting a DC input voltage from the energy source to a square wave AC output voltage, and a converter for converting the AC output voltage from the inverter to a sine wave AC output voltage.Type: GrantFiled: September 19, 2005Date of Patent: May 13, 2008Assignee: The Board of Trustees of the University of IllinoisInventors: Sudip K. Mazumder, Rajni K. Burra, Kaustuva Acharya
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Publication number: 20060062034Abstract: Apparatus for conditioning power generated by an energy source includes an inverter for converting a DC input voltage from the energy source to a square wave AC output voltage, and a converter for converting the AC output voltage from the inverter to a sine wave AC output voltage.Type: ApplicationFiled: September 19, 2005Publication date: March 23, 2006Inventors: Sudip Mazumder, Rajni Burra, Kaustuva Acharya
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Publication number: 20050141248Abstract: A novel power conditioning converter which provides a significant reduction in input current ripple (<1%), with efficiency above 90% and reduced thermal management is proposed. The converter in discussion has a sort-switched, multilevel, high frequency converter, which acts as an interface between the dc/dc boost and the ac/ac converter. This paper presents a detailed description of the operation of the converter and highlights the important features and advantages. SABER simulation results are presented to provide an improved understanding of the switching mechanisms. A discussion on the implementation of the converter and the status of ongoing work is presented.Type: ApplicationFiled: September 10, 2004Publication date: June 30, 2005Inventors: Sudip Mazumder, Rajni Burra, Kaustuva Acharya