Patents by Inventor Russell S. Trask

Russell S. Trask 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).

  • Input range expander for power supplies
    Patent number: 9335780
    Abstract: An electro-magnetic interference (EMI) filter having a boost mode amplifier integrated therewith is provided. The boost mode amplifier utilizes the filtering inductors of the EMI filter as energy storage devices to control the input voltage supplied to a DC-to-DC power converter. A controller is also provided for selectively activating the boost mode amplifier, maintaining the input voltage provided to the converter within a predetermined operating range.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: May 10, 2016
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Stanley M. Granat, Jorge-Luis B. Romeu, Russell S. Trask
  • Method and means to combine pulse width modulation level control, full resonance and zero voltage switching for switched mode power supplies
    Patent number: 8736245
    Abstract: A method for operating a switching power supply is provided. The method includes generating a half sine wave signal for coupling to a pulse width modulator, detecting the zero crossings of the half sine wave signal, and altering the pulse width of the supply output such that the on and off timing of the pulse width corresponds to a zero crossing of the half sine wave signal.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: May 27, 2014
    Assignee: Lockheed Martin Corporation
    Inventors: Stanley M. Granat, Fred Whitney, Jorge-Luis B. Romeu, Russell S. Trask