Patents by Inventor Dong Hwang

Dong Hwang 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: 10395866
    Abstract: Provided is a high voltage DC circuit breaker that interrupts a fault current flowing through a high voltage DC transmission line with a vacuum circuit breaker and a gas circuit breaker connected in series. The circuit breaker includes: a vacuum circuit breaker installed on a DC transmission line and operating to interrupt a current in the DC transmission line when a fault occurs on either side of the DC transmission line; a gas circuit breaker connected in series with the vacuum interrupter; an LC circuit connected in parallel with the vacuum circuit breaker and including a capacitor and a reactor connected in series to induce LC resonance; a first bidirectional switching device connected in series with the LC circuit and switching a current flowing in any of two opposite directions; and a second bidirectional switching device connected in parallel with the LC circuit.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: August 27, 2019
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Young Hwan Chung, Hui Dong Hwang, Nam Kyung Kim
  • Publication number: 20190253055
    Abstract: A clock distribution circuit may include a data clock generation circuit configured to generate an internal clock signal using an external clock signal. The clock distribution circuit may be configured to receive the internal clock signal through a first circuit and distribute the internal clock signal to an exterior of the clock distribution circuit through a second circuit coupled to a global line. A first bias voltage provided to the first circuit and the data clock generation circuit and a second bias voltage provided to the second circuit may be controlled independently of each other.
    Type: Application
    Filed: August 17, 2018
    Publication date: August 15, 2019
    Applicant: SK hynix Inc.
    Inventors: Soo Young JANG, Dae Han KWON, Geun Il LEE, Kyu Dong HWANG
  • Publication number: 20190253028
    Abstract: A buffer circuit may include: an amplifying circuit configured to change, based on a first input signal and a second input signal, voltage levels of a first output node and a second output node in a range between a first power voltage and a second power voltage; a latch circuit configured to latch the voltage levels of the first output node and the second output node; a first variable load configured to adjust, based on a reset signal, an amount of current provided by a first power voltage terminal at the first power voltage to the first output node; a second variable load configured to adjust, based on the reset signal, an amount of current provided by the first power voltage terminal to the second output node; and a reset circuit configured to drive the first output node to the second power voltage based on the reset signal.
    Type: Application
    Filed: October 25, 2018
    Publication date: August 15, 2019
    Applicant: SK hynix Inc.
    Inventor: Kyu Dong HWANG
  • Publication number: 20190252013
    Abstract: A buffering circuit includes a first signal input/output unit that generates an output bar signal in response to an input signal, a second signal input/output unit that generates an output signal in response to an input bar signal, and a connection unit that electrically connects and disconnects an output node of the first signal input/output unit and a current sink node of the second signal input/output unit to/from each other in response to a control signal, and electrically connects and disconnects a current sink node of the first signal input/output unit and an output node of the second signal input/output unit to/from each other in response to the control signal.
    Type: Application
    Filed: December 12, 2018
    Publication date: August 15, 2019
    Applicant: SK hynix Inc.
    Inventors: Kyu Dong HWANG, Dae Han KWON
  • Publication number: 20190199355
    Abstract: A semiconductor device may include an input control circuit, a counting circuit, an output control circuit, and a counting operation control circuit. The input control circuit may output a counting input signal based on an input signal and a counting over signal. The counting circuit may generate a preliminary counting code based on the counting input signal. The output control circuit may generate a counting code based on the preliminary counting code. The counting operation control circuit may generate the counting over signal based on a part of the counting code.
    Type: Application
    Filed: August 14, 2018
    Publication date: June 27, 2019
    Applicant: SK hynix Inc.
    Inventor: Kyu Dong HWANG
  • Patent number: 10304644
    Abstract: The present invention relates to a vacuum interrupter for a circuit breaker capable of forming and releasing a short circuit by moving two movable electrodes in forward/backward directions, and a driving method therefor. The vacuum interrupter according to the present invention includes: a housing with a vacuum state therein; and first and second movable electrodes partially accommodated within the housing, and attached to first and second movable contacts at respective ends thereof, wherein the first and second movable electrodes are capable of moving in forward/backward directions, and the first and second movable contacts contact each other and separate from each other by the movement in forward/backward directions of the first and second electrodes.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: May 28, 2019
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Hui-Dong Hwang, Young-Hwan Chung, Nam-Kyung Kim
  • Publication number: 20190097581
    Abstract: A semiconductor device may include an amplification circuit. The amplification circuit may be configured to generate an output signal and an output bar signal based on a mode signal, first and second control signals, an input signal, and an input bar signal. The amplification circuit may determine voltage levels of the output signal and the output bar signal based on the mode signal and the first and second control signals regardless of the input signal and the input bar signal.
    Type: Application
    Filed: August 2, 2018
    Publication date: March 28, 2019
    Applicant: SK hynix Inc.
    Inventor: Kyu Dong HWANG
  • Patent number: 10229794
    Abstract: Provided is a circuit breaker for a DC current using a magnetic field, which generates a magnetic flux and extinguishes an arc current generated in a main switch. The circuit breaker includes a main switch installed in a DC line, a coil wound so as to generate a magnetic flux in a direction vertical to the direction of an arc current generated when the main switch is opened, a semiconductor switch for switching current application to the coil, a capacitor connected in series to the semiconductor switch, and a first diode for conducting the electric current of the DC line, supplied from one side of the main switch, to the capacitor, wherein the semiconductor switch is turned on, in case a fault occurs, so that the electric current is applied to the coil by the voltage charged in the capacitor.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: March 12, 2019
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Hui-Dong Hwang, Byung-Chol Kim, Jung-Soo Park
  • Publication number: 20190027332
    Abstract: Provided is an actuator for a high-speed switch. The frame of the actuator is formed by a frame, and the frame consists of multiple mounting plates and columns. The mounting plates have parts installed thereon or movably supported thereby. The columns maintain the space between the mounting plates. A driving unit is installed so as to pass through a part of the mounting plates, and the driving unit is provided with a first driving plate and a second driving plate on a driving shaft. A first coil unit is provided on the mounting plate so as to face the first driving plate and generates the movement of the first driving plate at the time of an opening operation. A permanent magnet is installed on one of the mounting plates so as to face the second driving plate, and an elastic member is installed on the mounting plate that faces the mounting plate having the permanent magnet installed thereon, so as to provide force for the movement of the second driving plate.
    Type: Application
    Filed: December 21, 2016
    Publication date: January 24, 2019
    Inventors: Hyun Mo AN, Hui Dong HWANG, Dong Joon SIM
  • Patent number: 10181387
    Abstract: An electromagnetic repulsion actuator for a circuit breaker is provided. The actuator can include a housing; a first fixed electrode having therein an operating space open at both sides; a pair of movable electrodes capable of reciprocally moving and being electrically connected to the first fixed electrode; second fixed electrodes selectively contacting the pair of movable electrodes to be electrically connected thereto, thereby transferring power supplied from a first side to a second side; and actuating coils selectively moving the movable electrodes in a direction of being separated from the second fixed electrodes by generating electromagnetic force from induced current. In the present invention as above, the structure of a circuit breaker is simplified and moving speeds of the movable electrodes are increased since the movable electrodes move by using induced current generated by a close coil and open coils to perform an open operation.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: January 15, 2019
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Nam Kyung Kim, Young Hwan Chung, Hui Dong Hwang
  • Patent number: 10176939
    Abstract: Provided is a high-voltage direct current (DC) circuit breaker which interrupts a fault current flowing in a power transmission or power distribution DC line when a fault occurs in the DC line. The high-voltage DC circuit breaker includes: a main switch, installed in the DC line, for interrupting a current in the DC line by being opened when a fault occurs in one side or the other side of the DC line; a nonlinear resistor, connected in parallel to the main switch, for consuming overvoltage; and an LC circuit connected in parallel to the main switch and comprising a capacitor and an inductor that are connected to each other in series to generate LC resonance.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: January 8, 2019
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Jung-Soo Park, Se-Hee Han, Hui-Dong Hwang
  • Patent number: 10170903
    Abstract: A high-voltage DC circuit breaker for breaking a current that flows in a DC line, including: a main switch, installed on the DC line, for breaking a current of the DC line by opening when a fault occurs on one side or a remaining side of the DC line; a nonlinear resistor connected in parallel with the main switch; an LC circuit that is connected in parallel with the main switch and includes a capacitor and a reactor, which are connected in series in order to generate LC resonance; a first bidirectional switching element, connected to the LC circuit in series, for switching a bidirectional current flow; and a second bidirectional switching element, connected in parallel with the LC circuit, for switching a current flow to induce LC resonance in both directions.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: January 1, 2019
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Jung-Soo Park, Se-Hee Han, Hui-dong Hwang
  • Publication number: 20180294026
    Abstract: A semiconductor device may include a first buffer, a second buffer, a divider circuit and an internal signal generation circuit. The first buffer may buffer a first input signal and a second input signal to generate a first data strobe buffering signal and a first data strobe bar buffering signal. The second buffer may generate a second data strobe buffering signal based on the first input signal and a reference voltage. The divider circuit may divide the second data strobe buffering signal to generate a divided signal and a divided bar signal. The internal signal generation circuit may be configured to generate a first to fourth data latch timing signals having different phases based on the first data strobe buffering signal, the first data strobe bar buffering signal, the divided signal and the divided buffering signal.
    Type: Application
    Filed: April 6, 2018
    Publication date: October 11, 2018
    Applicant: SK hynix Inc.
    Inventors: Sang Kwon LEE, Kwang Soon KIM, Young Hoon KIM, Young Jun YOON, Kyu Dong HWANG
  • Publication number: 20180294115
    Abstract: The present invention relates to a vacuum interrupter for a circuit breaker capable of forming and releasing a short circuit by moving two movable electrodes in forward/backward directions, and a driving method therefor. The vacuum interrupter according to the present invention includes: a housing with a vacuum state therein; and first and second movable electrodes partially accommodated within the housing, and attached to first and second movable contacts at respective ends thereof, wherein the first and second movable electrodes are capable of moving in forward/backward directions, and the first and second movable contacts contact each other and separate from each other by the movement in forward/backward directions of the first and second electrodes.
    Type: Application
    Filed: December 29, 2015
    Publication date: October 11, 2018
    Inventors: Hui-Dong HWANG, Young-Hwan CHUNG, Nam-Kyung KIM
  • Patent number: 10071407
    Abstract: Provided is a camber control apparatus and method capable of reducing camber of a slab sizing press (SSP). The camber control apparatus and method may calculates a camber amount through an imaging process and differently set zeroing of anvils at a work side and a drive side, thereby reducing camber. Thus, the camber control apparatus and method can reduce quality defects such as telescope, twist, wave, and roll mark, increase the lifetime of equipment by reducing a variation in load applied to the equipment, and minimize a cost caused by an equipment accident.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: September 11, 2018
    Assignee: Hyundai Steel Company
    Inventors: Jin-Dong Hwang, Hyeong-Jin Kim, Yong-Kook Park, Woo-Young Shin
  • Publication number: 20180226965
    Abstract: A semiconductor apparatus may be provided. The semiconductor apparatus may include a first buffer configured to generate a first preliminary clock and a first preliminary clock bar based on an external clock, an external clock bar, and a node voltage code. The semiconductor apparatus may include a node voltage control circuit configured to generate the node voltage code based on a control code.
    Type: Application
    Filed: October 5, 2017
    Publication date: August 9, 2018
    Applicant: SK hynix Inc.
    Inventor: Kyu Dong HWANG
  • Patent number: 9859932
    Abstract: A receiver circuit may be provided. The receiver circuit may include a first duty cycle adjuster configured to correct a duty cycle of a first output signal pair. The receiver circuit may include a second duty cycle adjuster configured to correct a duty cycle of a second output signal pair, based on the first output signal pair, after the first duty cycle adjuster performs a correction on the duty cycle of the first output signal pair.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: January 2, 2018
    Assignee: SK hynix Inc.
    Inventor: Kyu Dong Hwang
  • Publication number: 20170352507
    Abstract: An electromagnetic repulsion actuator for a circuit breaker is provided. The actuator can include a housing; a first fixed electrode having therein an operating space open at both sides; a pair of movable electrodes capable of reciprocally moving and being electrically connected to the first fixed electrode; second fixed electrodes selectively contacting the pair of movable electrodes to be electrically connected thereto, thereby transferring power supplied from a first side to a second side; and actuating coils selectively moving the movable electrodes in a direction of being separated from the second fixed electrodes by generating electromagnetic force from induced current. In the present invention as above, the structure of a circuit breaker is simplified and moving speeds of the movable electrodes are increased since the movable electrodes move by using induced current generated by a close coil and open coils to perform an open operation.
    Type: Application
    Filed: December 30, 2015
    Publication date: December 7, 2017
    Inventors: Nam Kyung KIM, Young Hwan CHUNG, Hui Dong HWANG
  • Publication number: 20170352508
    Abstract: Provided is a high voltage DC circuit breaker that interrupts a fault current flowing through a high voltage DC transmission line with a vacuum circuit breaker and a gas circuit breaker connected in series. The circuit breaker includes: a vacuum circuit breaker installed on a DC transmission line and operating to interrupt a current in the DC transmission line when a fault occurs on either side of the DC transmission line; a gas circuit breaker connected in series with the vacuum interrupter; an LC circuit connected in parallel with the vacuum circuit breaker and including a capacitor and a reactor connected in series to induce LC resonance; a first bidirectional switching device connected in series with the LC circuit and switching a current flowing in any of two opposite directions; and a second bidirectional switching device connected in parallel with the LC circuit.
    Type: Application
    Filed: December 24, 2015
    Publication date: December 7, 2017
    Inventors: Young Hwan CHUNG, Hui Dong HWANG, Nam Kyung KIM
  • Patent number: D812152
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: March 6, 2018
    Assignee: SK Telecom Co., Ltd.
    Inventors: Eun Dong Hwang, Jung Hyuk Oh, Hong Sung Kim, Yun Jin Park