Patents by Inventor Vijay Gangadhar Phadke

Vijay Gangadhar Phadke 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).

  • Patent number: 6493245
    Abstract: The present invention provides for an apparatus and corresponding method for controlling inrush current in an AC-DC power converter by controlling the state of a plurality of silicon-controlled rectifiers (SCRs) when AC power is lost. The present invention provides full control of inrush current even during cold startup, warm startup, and power line disturbance conditions. The present invention controls inrush current without the need for an extra series dissapative device and its consequent additional losses. The preferred embodiment includes use of the present invention for AC-DC converters having active power factor correction. An alternative embodiment is for use in non-power factor corrected applications.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: December 10, 2002
    Assignee: Astec International Limited
    Inventor: Vijay Gangadhar Phadke
  • Publication number: 20020172061
    Abstract: An improved secondary control circuit is provided for controlling synchronous rectifiers in a switching power converter. The secondary control circuit employs control signals from a primary control circuit to drive two synchronous rectifiers. In particular, the secondary control circuit is operable to drive both synchronous rectifiers to an on state during a dead time period of operation. The onset of the dead time period occurs when the diagonal conducting switching device is driven to an off state. The secondary control circuit is further operable to drive the second of the two synchronous rectifiers to an on state only after one of the diagonal switching devices has been driven to an off state by the primary control circuit. In this way, the improved secondary control circuit eliminates the risk of cross conduction between the synchronous rectifiers.
    Type: Application
    Filed: May 18, 2001
    Publication date: November 21, 2002
    Inventor: Vijay Gangadhar Phadke