Patents by Inventor Fazie S. Quazi

Fazie S. Quazi 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).

  • Conversion circuit for limiting inrush current
    Patent number: 4864482
    Abstract: A conversion circuit is provided which includes a negative temperature coefficient resistance between a rectifier and a storage capacitor to limit inrush current when power is applied to the circuit after a power interruption of a relatively long duration. When power is resumed after a short term power interruption and the resistance of the negative temperature coefficient resistance is still low, inrush current is limited by disconnecting a load from the conversion circuit immediately upon the occurrence of the power interruption to maintain the charge on the storage capacitor for the duration of the interruption. A boost regulator unit is provied between the negative temperature coefficient resistance and the storage capacitor to provide a regulated direct current potential across the capacitor which is not responsive to input power variations.
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: September 5, 1989
    Assignee: Etta Industries, Inc.
    Inventors: Fazie S. Quazi, Ira S. Faberman