Patents by Inventor Eugene Quan

Eugene Quan 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).

  • Pseudo-random pulse width modulation for high resolution fan control
    Patent number: 7786781
    Abstract: A pulse width modulation (PWM) device, system and method for high resolution fan control are disclosed. In one embodiment, the method comprises determining a target duty cycle of a PWM signal, determining the number of PWM cycles in the period of the PWM signal, pseudo-randomly selecting a duty cycle for each PWM cycle using one or more look-up tables and generating the PWM signal based on the duty cycle.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: August 31, 2010
    Assignee: National Semiconductor Corporation
    Inventors: Chungwai Benedict Ng, Eric Tam, Eugene Quan