Patents by Inventor Christopher B. Richardson

Christopher B. Richardson 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).

  • Versatile system for high-power switching controller in low-power semiconductor technology
    Patent number: 7486063
    Abstract: The present invention provides a versatile system for providing a current-mode switching controller—in low voltage commercial semiconductor technologies—that is compatible with applications having very high input voltage ranges. The system provides an output transistor and a sense element coupled to the output transistor. A waveform representative of current charging across the sense element is recognized. First and second charging elements are provided, and the second charging element is adapted to charge at a rate twice as fast as the first charging element. First and second switching elements, coupled to the first and second charging elements, respectively, are adapted to activate the first and second charging elements responsive to a rising edge of the waveform.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: February 3, 2009
    Assignee: National Semiconductor Corporation
    Inventors: Wei Gu, Christopher B. Richardson
  • Versatile system for high-power switching controller in low-power semiconductor technology
    Patent number: 7274183
    Abstract: The present invention provides a versatile system for providing a current-mode switching controller—in low voltage commercial semiconductor technologies—that is compatible with applications having very high input voltage ranges. The system provides an output transistor and a sense element coupled to the output transistor. A waveform representative of current charging across the sense element is recognized. First and second charging elements are provided, and the second charging element is adapted to charge at a rate twice as fast as the first charging element. First and second switching elements, coupled to the first and second charging elements, respectively, are adapted to activate the first and second charging elements responsive to a rising edge of the waveform.
    Type: Grant
    Filed: November 2, 2005
    Date of Patent: September 25, 2007
    Assignee: National Semiconductor Corporation
    Inventors: Wei Gu, Christopher B. Richardson