Patents by Inventor Ching-Sung Wu

Ching-Sung Wu 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).

  • Capacitor charging circuit with a soft-start function
    Patent number: 7176657
    Abstract: When a primary winding current increases to an upper limit determined by a reference voltage having a soft-start characteristic, a power switch is turned OFF. When a secondary winding current decreases to a lower limit determined by another predetermined reference voltage, the power switch is turned ON. A minimum ON-time limiting unit prevents the power switch from being turned OFF before a minimum ON-time expires. The minimum ON-time may be provided with a soft-start modulation. A minimum OFF-time limiting unit prevents the power switch from being turned ON before a minimum OFF-time expires. A maximum ON-time limiting unit prevents the power switch from still remaining ON after a maximum ON-time expires.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: February 13, 2007
    Assignee: Aimtron Technology Corp.
    Inventors: Rong-Chin Lee, Ching-Kun Lin, Ching-Sung Wu
  • CAPACITOR CHARGING CIRCUIT WITH A SOFT-START FUNCTION
    Publication number: 20060033477
    Abstract: When a primary winding current increases to an upper limit determined by a reference voltage having a soft-start characteristic, a power switch is turned OFF. When a secondary winding current decreases to a lower limit determined by another predetermined reference voltage, the power switch is turned ON. A minimum ON-time limiting unit prevents the power switch from being turned OFF before a minimum ON-time expires. The minimum ON-time may be provided with a soft-start modulation. A minimum OFF-time limiting unit prevents the power switch from being turned ON before a minimum OFF-time expires. A maximum ON-time limiting unit prevents the power switch from still remaining ON after a maximum ON-time expires.
    Type: Application
    Filed: August 16, 2004
    Publication date: February 16, 2006
    Inventors: Rong-Chin Lee, Ching-Kun LIN, Ching-Sung WU