Patents by Inventor Sung Kyou Choi

Sung Kyou Choi 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).

  • Regenerative power storage system mounted on DC electric railway car
    Patent number: 8710702
    Abstract: A regenerative electric power storage system installed onboard a DC electric rail car comprises: a filter unit which removes high frequency components from the DC power supplied through the catenary of a pantograph; a storage unit for storing power; a bidirectional DC/DC converter which is electrically connected between the filter unit and the storage unit; a DC/DC filter unit to remove high frequency noise; a voltage detection unit and a control unit which controls the switching of the bidirectional DC/DC converter. Instability is presented in the remaining systems of the electric rail car.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: April 29, 2014
    Assignee: Korea Railroad Research Institute
    Inventors: Gil-Dong Kim, Han-Min Lee, Chang-Mu Lee, Sung-Kyou Choi
  • ON-BOARD REGENERATIVE ELECTRIC POWER STORAGE SYSTEM FOR DC ELECTRIC RAIL CAR
    Publication number: 20120013181
    Abstract: A regenerative electric power storage system installed onboard a DC electric rail car comprises: a filter unit which removes high frequency components from the DC power supplied through the catenary of a pantograph; a storage unit for storing power; a bidirectional DC/DC converter which is electrically connected between the filter unit and the storage unit; a DC/DC filter unit to remove high frequency noise; a voltage detection unit and a control unit which controls the switching of the bidirectional DC/DC converter. Instability is presented in the remaining systems of the electric rail car.
    Type: Application
    Filed: December 16, 2009
    Publication date: January 19, 2012
    Inventors: Gil-Dong Kim, Han-Min Lee, Chang-Mu Lee, Sung-Kyou Choi
  • Electrical inertial load controlling apparatus having gate drive for protecting IGBT
    Patent number: 7042691
    Abstract: The present invention provides a gate drive for protecting a switching element (IGBT) used for an electrical inertial load controller. A high-voltage IGBT is used as the switching element and an hcp1316j is used as the gate drive of the IGBT, to restrict overvoltage and overcurrent generated in the event of inverter switching, preventing destruction of the IGBT in advance. Furthermore, an RC filter is formed in close proximity to the IGBT to minimize an erroneous switching operation due to harmonics generated caused by noise in case of inverter switching to improve the system reliability and block an increase in abnormal voltage applied across the switching element.
    Type: Grant
    Filed: December 24, 2001
    Date of Patent: May 9, 2006
    Assignee: Korea Railroad Research Institute
    Inventors: Gil Dong Kim, Young Jae Han, Hyun Jun Park, Sung Kyou Choi, Jung Min Cho
  • Electrical inertial load controlling apparatus having gate drive for proctecting igbt
    Publication number: 20040136131
    Abstract: The present invention provides a gate drive for protecting a switching element (IGBT) used for an electrical inertial load controller. A high-voltage IGBT is used as the switching element and an hcp1316j is used as the gate drive of the IGBT, to restrict overvoltage and overcurrent generated in the event of inverter switching, preventing destruction of the IGBT in advance. Furthermore, an RC filter is formed in close proximity to the IGBT to minimize an erroneous switching operation due to harmonics generated caused by noise in case of inverter switching to improve the system reliability and block an increase in abnormal voltage applied across the switching element.
    Type: Application
    Filed: March 1, 2004
    Publication date: July 15, 2004
    Inventors: Gil Dong Kim, Young Jae Han, HyunJun Park, Sung Kyou Choi, Jung Min Cho