Patents by Inventor Ramakrishnan Venkatraman
Ramakrishnan Venkatraman 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).
-
Publication number: 20230367938Abstract: A method comprises creating an electronic module design having a plurality of electronic components comprising a plurality of low power enabled components and defining a model of functional behavior and of power behavior. The method also comprises identifying sequential element information correlated with an electronic component based on the models of functional and power behavior. the sequential element information comprising a first control signal and a second control signal. A coverage test is generated based on the sequential element information and is configured to quantify behavior of the electronic component based on a relationship of a plurality of activation states of a first control signal to a plurality of activation states of a second control signal. A simulation file is run to simulate operation of the electronic module design, and a performance status of the electronic module design is determined in response to running the simulation file.Type: ApplicationFiled: May 10, 2023Publication date: November 16, 2023Inventors: Vivek Gandhi, Ramakrishnan Venkatraman, Lakshmanan Balasubramanian, Harsh Kumar Sharma
-
Patent number: 7868559Abstract: An electronic ballast with higher startup voltage includes converter with a switching circuit (40) responsive to a switching control signal (50) and operably connected to a DC bus (30); a DC controller (44) comparing a sensed DC bus voltage signal and a reference DC bus voltage signal to generate the switching control signal (50); and a startup adjustor operably connected to the DC controller (44) to adjust at least one of the sensed DC bus voltage signal and the reference DC bus voltage signal for a predetermined time at startup so that startup DC bus voltage is greater than steady state DC bus voltage.Type: GrantFiled: December 8, 2005Date of Patent: January 11, 2011Assignee: Koninklijke Philips Electronics N.V.Inventors: Ramakrishnan Venkatraman, Romel Panlilio
-
Publication number: 20090224696Abstract: An electronic ballast with higher startup voltage includes converter with a switching circuit (40) responsive to a switching control signal (50) and operably connected to a DC bus (30); a DC controller (44) comparing a sensed DC bus voltage signal and a reference DC bus voltage signal to generate the switching control signal (50); and a startup adjustor operably connected to the DC controller (44) to adjust at least one of the sensed DC bus voltage signal and the reference DC bus voltage signal for a predetermined time at startup so that startup DC bus voltage is greater than steady state DC bus voltage.Type: ApplicationFiled: December 8, 2005Publication date: September 10, 2009Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: Ramakrishnan Venkatraman, Romel Panlilio
-
Patent number: 7486031Abstract: A striation correction circuit 300 is arranged to apply a first striation correction current to the first fluorescent lamp L1 and a second striation correction current to the second fluorescent lamp L2. A first voltage appearing across the first fluorescent tube L1 due to the first striation correction current is substantially similar in magnitude but has inverted polarity with respect to a second voltage across the second fluorescent tube L2 due to the second striation correction current. Detection of an end-of-life condition of a fluorescent lamp is facilitated.Type: GrantFiled: November 18, 2003Date of Patent: February 3, 2009Assignee: Koninklijke Philips Electronics N.V.Inventors: Sree Venkit, Ramakrishnan Venkatraman, Amr Ghazala
-
Publication number: 20080129216Abstract: An anti-striation circuit employs an inverter topology including a pair of electronic switches (Q, M) that are switched between a conducting state and a nonconducting state in an alternating manner to apply an asymmetrical voltage waveform across one or more lamp (LP) to thereby control a flow of an asymmetrical current waveform (iacc) through lamps (LP). To eliminate, if not minimize, visible striations in the lamp(s) (LP), the impedances of an asymmetrical driver as connected to the control inputs (B, G) of the electronic switches (Q, M) may be unequal, and/or the impedances of an asymmetrical driver as connected to the current paths (C-E, D-S) of the electronic switches (Q, M) may be unequal. Additionally, the current gains of the electronic switches (Q, M) may be unequal, and a DC current may flow through the lamp(s) (LP).Type: ApplicationFiled: November 9, 2005Publication date: June 5, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: Yuhong Fang, Michael Y. Zhang, Ramakrishnan Venkatraman, Romel Panlilio, Ganesh Arun, Rohit Khetarpal
-
Publication number: 20060097666Abstract: A striation correction circuit 300 is arranged to apply a first striation correction current to the first fluorescent lamp L1 and a second striation correction current to the second fluorescent lamp L2. A first voltage appearing across the first fluorescent tube L1 due to the first striation correction current is substantially similar in magnitude but has inverted polarity with respect to a second voltage across the second fluorescent tube L2 due to the second striation correction current. Detection of an end-of-life condition of a fluorescent lamp is facilitated.Type: ApplicationFiled: November 18, 2003Publication date: May 11, 2006Applicant: Koninklijke Philips Electronics N.V.Inventors: Sreeraman Venkitasubrahmanian, Ramakrishnan Venkatraman, Amr Ghazala
-
Patent number: 6664742Abstract: A filament cut-back circuit comprises an impedance circuit coupled in series between either an AC voltage source and a primary filament winding, or a secondary filament winding and a filament. In response to an alternating voltage from the AC voltage source when coupled in series thereto or an alternating voltage from the secondary filament winding when coupled in series thereto, the impedance circuit operates as a short circuit when the alternating voltage is at a preheat frequency and operates as an open circuit when the alternating voltage is at an operating frequency.Type: GrantFiled: January 11, 2002Date of Patent: December 16, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Ramakrishnan Venkatraman, Michael Y. Zhang
-
Publication number: 20030132718Abstract: A filament cut-back circuit is disclosed. The filament cut-back circuit comprises an impedance circuit coupled in series between either an AC voltage source and a primary filament winding, or a secondary filament winding and a filament. In response to an alternating voltage from the AC voltage source when coupled in series thereto or an alternating voltage from the secondary filament winding when coupled in series thereto, the impedance circuit operates as a short circuit when the alternating voltage is at a preheat frequency and operates as an open circuit when the alternating voltage is at an operating frequency.Type: ApplicationFiled: January 11, 2002Publication date: July 17, 2003Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Ramakrishnan Venkatraman, Michael Y. Zhang