Patents by Inventor Chandrashekara Atra

Chandrashekara Atra 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).

  • CFL ballast with passive valley fill and crest factor control
    Patent number: 7274154
    Abstract: According to the disclosed embodiment of the invention, a circuit and method for stabilizing an operating characteristic of a compact fluorescent lamp driven by a ballast circuit having an operating frequency controlled by a component value, may comprise a first circuit connected to said ballast circuit for applying the component value thereto; and a second circuit connected to the ballast circuit for changing the component value so as to stabilize the operating characteristic. The operating characteristic may be power, current, voltage or crest factor for example. The second circuit changes the component value in response to a bus voltage of the ballast circuit and includes a switching device such as a transistor responsive to the bus voltage.
    Type: Grant
    Filed: February 16, 2005
    Date of Patent: September 25, 2007
    Assignee: International Rectifier Corporation
    Inventors: Chandrashekara Atra, Cecilia Contenti
  • CFL ballast with passive valley fill and crest factor control
    Publication number: 20050184679
    Abstract: According to the disclosed embodiment of the invention, a circuit and method for stabilizing an operating characteristic of a compact fluorescent lamp driven by a ballast circuit having an operating frequency controlled by a component value, may comprise a first circuit connected to said ballast circuit for applying the component value thereto; and a second circuit connected to the ballast circuit for changing the component value so as to stabilize the operating characteristic. The operating characteristic may be power, current, voltage or crest factor for example. The second circuit changes the component value in response to a bus voltage of the ballast circuit and includes a switching device such as a transistor responsive to the bus voltage.
    Type: Application
    Filed: February 16, 2005
    Publication date: August 25, 2005
    Inventors: Chandrashekara Atra, Cecilia Contenti