Patents by Inventor Yong-Chul Ryu

Yong-Chul Ryu 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).

  • Patent number: 7548437
    Abstract: A switching mode power supply (SMPS) is presented to compensate for variations of maximum output power caused by variations of input power. The output power varies according to variations of input power because of a propagation delay of the SMPS. To compensate for the propagation delay, a reference voltage for turning off a switching MOS transistor is differently established depending on the input voltage. The variation of maximum output power according to the input voltage is prevented by differentiating the turned-off time of the reference voltage for turning off a main switch, such as a switching MOS transistor according to the input voltage.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: June 16, 2009
    Assignee: Fairchild Korea Semiconductor, Ltd.
    Inventors: Jin-Ho Choi, Dong-Young Huh, Yong-Chul Ryu
  • Publication number: 20050270808
    Abstract: A switching mode power supply (SMPS) is presented to compensate for variations of maximum output power caused by variations of input power. The output power varies according to variations of input power because of a propagation delay of the SMPS. To compensate for the propagation delay, a reference voltage for turning off a switching MOS transistor is differently established depending on the input voltage. The variation of maximum output power according to the input voltage is prevented by differentiating the turned-off time of the reference voltage for turning off a main switch, such as a switching MOS transistor according to the input voltage.
    Type: Application
    Filed: May 3, 2005
    Publication date: December 8, 2005
    Inventors: Jin-Ho Choi, Dong-Young Huh, Yong-Chul Ryu