Patents by Inventor Sree Venkit

Sree Venkit 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).

  • Electronic ballast and startup method
    Patent number: 9210783
    Abstract: An electronic ballast and startup method including an electronic ballast operably connected to a lamp having a lamp filament, the electronic ballast having a timer (110) generating an inverter control signal (112) and a preheat control signal (114); a converter (120) receiving AC power and generating DC power (122); a self-oscillating inverter (130) receiving DC power (122) and being operable to provide lamp power (132) to the lamp, the self-oscillating inverter (130) being responsive to the inverter control signal (112); and a filament preheater (140) receiving DC power (122) and being operable to provide filament power (142) to the lamp filament, the filament preheater (140) being responsive to the preheat control signal (114). When AC power is initially applied, preheat control signal (114) directs the filament preheater (140) to provide filament power (142), and inverter control signal (112) directs the self-oscillating inverter (130) not to provide lamp power (132).
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: December 8, 2015
    Assignee: KONINKLIJKE PHILIP N.V.
    Inventors: Yuhong Fang, Sree Venkit, Sanjaya Kumar Pradhan, Alejandro Lopez, George Grouev, Arun Ganesh, Bruce Rhodes
  • ELECTRONIC BALLAST AND STARTUP METHOD
    Publication number: 20120112636
    Abstract: An electronic ballast and startup method including an electronic ballast operably connected to a lamp having a lamp filament, the electronic ballast having a timer (110) generating an inverter control signal (112) and a preheat control signal (114); a converter (120) receiving AC power and generating DC power (122); a self-oscillating inverter (130) receiving DC power (122) and being operable to provide lamp power (132) to the lamp, the self-oscillating inverter (130) being responsive to the inverter control signal (112); and a filament preheater (140) receiving DC power (122) and being operable to provide filament power (142) to the lamp filament, the filament preheater (140) being responsive to the preheat control signal (114). When AC power is initially applied, preheat control signal (114) directs the filament preheater (140) to provide filament power (142), and inverter control signal (112) directs the self-oscillating inverter (130) not to provide lamp power (132).
    Type: Application
    Filed: June 30, 2010
    Publication date: May 10, 2012
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Yuhong Fang, Sree Venkit, Sanjaya Kumar Pradhan, Alejandro Lopez, George Grouev, Arun Ganesh, Bruce Rhodes
  • Symmetric cancelling anti-striation circuit
    Patent number: 7486031
    Abstract: 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: Grant
    Filed: November 18, 2003
    Date of Patent: February 3, 2009
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Sree Venkit, Ramakrishnan Venkatraman, Amr Ghazala