Patents by Inventor Yoondong Sung

Yoondong Sung 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).

  • Hybrid DC-DC converter with LLC converter and full-bridge converter
    Patent number: 9490709
    Abstract: Disclosed is a hybrid dc-dc converter. The hybrid dc-dc converter includes: a pair of transformers configured to magnetically couple a primary side to a secondary side, a full-bridge converter including four switches constituting a full-bridge inverter circuit and a first transformer, and an LLC resonant converter including a resonant inductor, a resonant capacitor, and a second transformer, which constitute an LLC resonant circuit, wherein an output of the full-bridge converter and an output of the LLC resonant converter are connected to each other in series at the secondary side.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: November 8, 2016
    Assignee: KOREA INSTITUTE OF ENERGY RESEARCH
    Inventors: Iloun Lee, Suyong Chae, Yujin Song, Seashung Oh, Sukin Park, Yoondong Sung
  • HYBRID DC-DC CONVERTER WITH LLC CONVERTER AND FULL-BRIDGE CONVERTER
    Publication number: 20160190933
    Abstract: Disclosed is a hybrid dc-dc converter. The hybrid dc-dc converter includes: a pair of transformers configured to magnetically couple a primary side to a secondary side, a full-bridge converter including four switches constituting a full-bridge inverter circuit and a first transformer, and an LLC resonant converter including a resonant inductor, a resonant capacitor, and a second transformer, which constitute an LLC resonant circuit, wherein an output of the full-bridge converter and an output of the LLC resonant converter are connected to each other in series at the secondary side.
    Type: Application
    Filed: December 30, 2014
    Publication date: June 30, 2016
    Inventors: Iloun LEE, Suyong CHAE, Yujin SONG, Seashung OH, Sukin PARK, Yoondong SUNG
  • Method for key update based on the amount of communication in wireless sensor networks having hierarchy structure
    Patent number: 8831226
    Abstract: The present invention relates to a key update method based on the amount of communication in wireless sensor networks having a hierarchy structure.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: September 9, 2014
    Assignee: Gwangju Institute of Science and Technology
    Inventors: Saewoom Lee, Kiseon Kim, Jeehoon Lee, Yoondong Sung
  • METHOD FOR KEY UPDATE BASED ON THE AMOUNT OF COMMUNICATION IN WIRELESS SENSOR NETWORKS HAVING HIERARCHY STRUCTURE
    Publication number: 20120140926
    Abstract: The present invention relates to a key update method based on the amount of communication in wireless sensor networks having a hierarchy structure.
    Type: Application
    Filed: November 14, 2011
    Publication date: June 7, 2012
    Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Saewoom Lee, Kiseon Kim, Jeehoon Lee, Yoondong Sung