Patents by Inventor Won-Sob Lee

Won-Sob Lee 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).

  • Switching mode power supply
    Patent number: 6646894
    Abstract: Disclosed is a switching mode power supply that includes: a power supply section including a main switch coupled to the primary winding of a transformer, wherein the main switch in normal operation mode performs a switching operation at a predetermined duty, wherein the main switch in standby mode does not perform a switching operation during a first interval and performs a switching operation during a second interval at a first duty, thereby supplying power to the secondary winding of the transformer; a mode discriminator for sensing the reception of an external sync signal at the primary winding of the transformer and generating a signal for operating the main switch in normal operation mode or in standby mode according to whether or not the external sync signal is received; a control voltage generator having a first transistor to which a current corresponding to a signal output from the mode discriminator flows, and a first capacitor connected in parallel to the first transistor; and a switching controller
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: November 11, 2003
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Keun-Eui Hong, Won-Sob Lee
  • Switching mode power supply
    Publication number: 20030117813
    Abstract: Disclosed is a switching mode power supply that includes: a power supply section including a main switch coupled to the primary winding of a transformer, wherein the main switch in normal operation mode performs a switching operation at a predetermined duty, wherein the main switch in standby mode does not perform a switching operation during a first interval and performs a switching operation during a second interval at a first duty, thereby supplying power to the secondary winding of the transformer; a mode discriminator for sensing the reception of an external sync signal at the primary winding of the transformer and generating a signal for operating the main switch in normal operation mode or in standby mode according to whether or not the external sync signal is received; a control voltage generator having a first transistor to which a current corresponding to a signal output from the mode discriminator flows, and a first capacitor connected in parallel to the first transistor; and a switching controller
    Type: Application
    Filed: November 15, 2002
    Publication date: June 26, 2003
    Applicant: Fairchild Korea Semiconductor, LTD
    Inventors: Keun-Eui Hong, Won-Sob Lee