Patents by Inventor Kenneth W. Keller

Kenneth W. Keller 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).

  • Advanced low voltage lighting system
    Patent number: 8134310
    Abstract: Disclosed is a lighting system supporting multiple independently controlled zones utilizing a plurality of semiconductor switches coupled to a plurality of transformers to produce a non-sinusoidal power output and controlled by a digital controller that receives feedback from each zone in order to auto-sense the proper voltage for a plurality of connected loads.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: March 13, 2012
    Inventors: Joel Wacknov, Randall W. Brumbaugh, Paul D. Chancellor, Kenneth W. Keller, David J. McShane
  • ADVANCED LOW VOLTAGE LIGHTING SYSTEM
    Publication number: 20100039043
    Abstract: Disclosed is a lighting system supporting multiple independently controlled zones utilizing a plurality of semiconductor switches coupled to a plurality of transformers to produce a non-sinusoidal power output and controlled by a digital controller that receives feedback from each zone in order to auto-sense the proper voltage for a plurality of connected loads.
    Type: Application
    Filed: August 15, 2008
    Publication date: February 18, 2010
    Inventors: Joel Wacknov, Randall W. Brumbaugh, Paul D. Chancellor, Kenneth W. Keller, David J. McShane
  • Advanced low voltage lighting system
    Patent number: 7471051
    Abstract: Disclosed is a lighting system supporting multiple independently controlled zones utilizing a plurality of semiconductor switches coupled to a plurality of transformers to produce a non-sinusoidal power output and controlled by a digital controller that receives feedback from each zone in order to auto-sense the proper voltage for a plurality of connected loads.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: December 30, 2008
    Assignee: Avatar Systems LLC
    Inventors: Joel Wacknov, Randall W. Brumbaugh, Paul D. Chancellor, Kenneth W. Keller, David J. McShane
  • System and method for pre-charging the DC bus of a utility connected power converter
    Patent number: 7092262
    Abstract: A system and method for pre-charging the DC bus of a utility connected power converter. In one embodiment, a full-wave rectifier circuit is coupled to the utility grid through an isolation transformer and circuit protector. The rectifier circuit output is connected to the DC bus of the power converter to provide a pre-charging current to the DC bus capacitors. The output from the rectifier circuit also supplies power to the control circuit power supply for the converter. When the control circuit closes the contactor of the converter system and activates the converter, the voltage across the DC bus capacitors is increased above the level of the rectified power grid voltage provided at the output of the pre-charge circuit. This reverse-biases the rectifier diodes, placing the pre-charge circuit into an inactive state. The impedance of the isolation transformer limits the in-rush current into the DC bus capacitors during the pre-charge.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: August 15, 2006
    Assignee: Capstone Turbine Corporation
    Inventors: Michael J. Ryan, Mark G. Gilbreth, Kenneth W. Keller, Simon R. Wall