Patents by Inventor HYUN-SAM JUNG

HYUN-SAM JUNG 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).

  • Publication number: 20210067075
    Abstract: A method for estimating a magnet temperature of a rotor magnet within a rotary electric machine includes, while a rotor of the electric machine is stationary, injecting a high-frequency voltage component onto a control voltage of the electric machine, via a controller, to generate an adjusted voltage command, and extracting a high-frequency component of a resulting current as an extracted high-frequency component. The method also includes calculating an inductance value of the electric machine using the extracted high-frequency component of the resulting current. The magnet temperature is estimated using the calculated inductance value and an angular position of the rotor. The method includes controlling an operation of the electric machine using the estimated magnet temperature. An electric powertrain uses the electric machine and controller noted above.
    Type: Application
    Filed: September 4, 2019
    Publication date: March 4, 2021
    Applicants: GM GLOBAL TECHNOLOGY OPERATIONS LLC, Seoul National University R & DB Foundation
    Inventors: Daniel J. Berry, Anno Yoo, Seung Ki Sul, Hyun-Sam Jung
  • Publication number: 20200228028
    Abstract: A unit power cell of an inverter system, according to one embodiment of the present invention, comprises: a first leg including first and fourth switching elements, which are connected in series to each other, second and third switching elements, which are connected in series with each other between a connection point of the first and second switching elements and a smoothing unit, and first, second, third and fourth diodes, which are inversely and respectively connected in parallel with the first, second, third and fourth switching elements; and a second leg connected in parallel with the first leg and including fifth and sixth switching elements, which are connected in series to each other, and fifth and sixth diodes, which are inversely and respectively connected in parallel with the fifth and sixth switching elements.
    Type: Application
    Filed: July 18, 2018
    Publication date: July 16, 2020
    Inventors: Sung-Guk AHN, Seung-Ki SUL, Hyun-Sam JUNG, Jeong-Mock YOO
  • Publication number: 20180183336
    Abstract: Disclosed herein is an apparatus for controlling DC link voltage in power cells of a medium-voltage inverter. The apparatus controls DC link voltage in single-phase I/O power cells in the medium-voltage inverter, by way of using a first average power based on a positive sequence voltage and a positive sequence current to output a first DC link voltage reference for controlling the average value of the DC link voltages, and using a second average power based on a negative sequence voltage and a positive sequence current or a positive sequence voltage and a negative sequence current to output a second DC link voltage reference for controlling an interphase DC link voltage.
    Type: Application
    Filed: November 1, 2017
    Publication date: June 28, 2018
    Inventors: Jong-Je PARK, Seung-Ki SUL, Jeong-Mock YOO, Hyun-Sam JUNG
  • Patent number: 10008937
    Abstract: Disclosed herein is an apparatus for controlling DC link voltage in power cells of a medium-voltage inverter. The apparatus controls DC link voltage in single-phase I/O power cells in the medium-voltage inverter, by way of using a first average power based on a positive sequence voltage and a positive sequence current to output a first DC link voltage reference for controlling the average value of the DC link voltages, and using a second average power based on a negative sequence voltage and a positive sequence current or a positive sequence voltage and a negative sequence current to output a second DC link voltage reference for controlling an interphase DC link voltage.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: June 26, 2018
    Assignee: LSIS CO., LTD.
    Inventors: Jong-Je Park, Seung-Ki Sul, Jeong-Mock Yoo, Hyun-Sam Jung
  • Patent number: 9819294
    Abstract: An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a DC link. The inverter control apparatus includes a current sensor to sense an output current of the inverter, a voltage sensor to sense a DC-link voltage of the inverter, and a controller to generate an average of a periodically varying rotor based q-axis current boundary value based on the output current and the DC-link voltage to generate a current reference on the basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor based on the current reference. Stabilized variable speed control of a motor by using a small-capacitance capacitor for a DC link of an inverter is performed and reliability of an inverter circuit improved.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: November 14, 2017
    Assignees: SAMSUNG ELECTRONICS CO., LTD., SNU R&DB FOUNDATION
    Inventors: Young Jae Park, Han Sol Seo, Bodrov Alexey, Seung Ki Sul, Hyun-Sam Jung, Seung-Jun Chee
  • Publication number: 20150381095
    Abstract: An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a DC link. The inverter control apparatus includes a current sensor to sense an output current of the inverter, a voltage sensor to sense a DC-link voltage of the inverter, and a controller to generate an average of a periodically varying rotor based q-axis current boundary value based on the output current and the DC-link voltage to generate a current reference on the basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor based on the current reference. Stabilized variable speed control of a motor by using a small-capacitance capacitor for a DC link of an inverter is performed and reliability of an inverter circuit improved.
    Type: Application
    Filed: September 2, 2015
    Publication date: December 31, 2015
    Applicants: SAMSUNG ELECTRONICS CO., LTD., SNU R&DB FOUNDATION
    Inventors: Young Jae PARK, Han Sol Seo, Bodrov Alexey, Seung Ki Sul, Hyun-Sam Jung, Seung-Jun Chee
  • Patent number: 9136790
    Abstract: An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a DC link. The inverter control apparatus includes a current sensor to sense an output current of the inverter, a voltage sensor to sense a DC-link voltage of the inverter, and a controller to generate an average of a periodically varying rotor based q-axis current boundary value based on the output current and the DC-link voltage to generate a current reference on the basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor based on the current reference. Stabilized variable speed control of a motor by using a small-capacitance capacitor for a DC link of an inverter is performed and reliability of an inverter circuit improved.
    Type: Grant
    Filed: November 23, 2012
    Date of Patent: September 15, 2015
    Assignees: SAMSUNG ELECTRONICS CO., LTD., SNU R&DB FOUNDATION
    Inventors: Young Jae Park, Han Sol Seo, Bodrov Alexey, Seung Ki Sul, Hyun-Sam Jung, Seung-Jun Chee
  • Publication number: 20140028237
    Abstract: An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a DC link. The inverter control apparatus includes a current sensor to sense an output current of the inverter, a voltage sensor to sense a DC-link voltage of the inverter, and a controller to generate an average of a periodically varying rotor based q-axis current boundary value based on the output current and the DC-link voltage to generate a current reference on the basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor based on the current reference. Stabilized variable speed control of a motor by using a small-capacitance capacitor for a DC link of an inverter is performed and reliability of an inverter circuit improved.
    Type: Application
    Filed: November 23, 2012
    Publication date: January 30, 2014
    Applicants: SNU R&DB FOUNDATION, SAMSUNG ELECTRONICS CO., LTD.
    Inventors: YOUNG JAE PARK, HAN SOL SEO, BODROV ALEXEY, SEUNG KI SUL, HYUN-SAM JUNG, SEUNG-JUN CHEE