Patents by Inventor Won Joon Choe
Won Joon Choe 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).
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Patent number: 9647450Abstract: This specification relates to fault current limiter (FCL). More particularly, to solve problems of protecting and designing current limiting impedance in a protective coordination system, as limitations of the related art, the fault current limiter may measure heat capacity of a current limiting impedance unit by detecting fault current flowing to the current limiting impedance unit and limiting the fault current flowing to the current limiting impedance unit according to the measured heat capacity, which may result in preventing the current limiting impedance unit from being damaged due to the fault current, preventing an extended accident due to the damaged current limiting impedance unit and enabling a stabilized system and line protection.Type: GrantFiled: May 8, 2015Date of Patent: May 9, 2017Assignee: LSIS CO., LTD.Inventors: Seung Hyun Bang, Won Joon Choe, Min Jee Kim, Kil Young Ahn
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Publication number: 20150333506Abstract: This specification relates to fault current limiter (FCL). More particularly, to solve problems of protecting and designing current limiting impedance in a protective coordination system, as limitations of the related art, the fault current limiter may measure heat capacity of a current limiting impedance unit by detecting fault current flowing to the current limiting impedance unit and limiting the fault current flowing to the current limiting impedance unit according to the measured heat capacity, which may result in preventing the current limiting impedance unit from being damaged due to the fault current, preventing an extended accident due to the damaged current limiting impedance unit and enabling a stabilized system and line protection.Type: ApplicationFiled: May 8, 2015Publication date: November 19, 2015Applicant: LSIS CO., LTD.Inventors: Seung Hyun BANG, Won Joon CHOE, MIN Jee KIM, Kil Young AHN
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Patent number: 9093838Abstract: The fault current detecting circuit includes: a current detection unit that outputs a current detection signal; a first comparing circuit unit that compares the current detection signal with a predetermined reference current value and outputs a first output signal; a differentiator that differentiates the current detection signal to output a change slope of the current detection signal; a second comparing circuit unit that compares the change slope with a predetermined reference change slope value and outputs a second output signal; a third comparing circuit unit that compares the current detection signal with a predetermined current detection limit reference value and output a third output signal; and a trip determining unit that outputs a trip control signal only when the first output signal and the second output signal are maintained to be received and the third output signal is not received.Type: GrantFiled: October 10, 2013Date of Patent: July 28, 2015Assignee: LSIS Co., Ltd.Inventors: Seung Hyun Bang, Hae Yong Park, Gyeong Ho Lee, Jung Wook Sim, Won Joon Choe, Min Jee Kim
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Patent number: 8830646Abstract: Provided is a protection coordination system. The system includes a current limiter arranged on a line between a first relay and a second relay to limit a fault current generated to within a predetermined scope.Type: GrantFiled: July 11, 2012Date of Patent: September 9, 2014Assignee: LSIS Co., Ltd.Inventors: Seung Hyun Bang, Kwon Bae Park, Won Joon Choe, Jung Wook Sim, Gyeong Ho Lee, Hae Yong Park, Min Jee Kim
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Patent number: 8760834Abstract: Provided is a fault current limiter, the limiter including a detector detecting an inflow of a fault current and transmitting a turn-off signal to a power semiconductor element; the power semiconductor element changed to an OFF state by the turn-off signal; and a resistance element connected in parallel to the power semiconductor element to block the fault current.Type: GrantFiled: July 6, 2012Date of Patent: June 24, 2014Assignee: LSIS Co., Ltd.Inventors: Jung Wook Sim, Won Joon Choe, Gyeong Ho Lee, Seung Hyun Bang, Min Jee Kim, Hae Yong Park
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Patent number: 8749938Abstract: Provided is a fault current limiter, the limiter including a detector detecting an inflow of a fault current and transmitting a turn-on signal to a first switch and transmitting a turn-off signal to a power semiconductor element, the power semiconductor element changed to an OFF state by the turn-off signal, the first switch forming a current limiting circuit by being switched to an ON state by the turn-on signal, and a resistance element blocking the fault current, wherein the series connection between the resistance element and the first switch is connected in parallel to the power semiconductor element.Type: GrantFiled: July 6, 2012Date of Patent: June 10, 2014Assignee: LSIS Co., Ltd.Inventors: Jung Wook Sim, Won Joon Choe, Gyeong Ho Lee, Seung Hyun Bang, Hae Yong Park, Min Jee Kim
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Patent number: 8723591Abstract: A method for driving an IGBT, wherein a transient voltage applied across the IGBT is reduced by altering a rate of change of a gate-emitter voltage of the IGBT.Type: GrantFiled: June 21, 2012Date of Patent: May 13, 2014Assignee: LSIS Co., Ltd.Inventors: Gyeong Ho Lee, Hae Yong Park, Seung Hyun Bang, Jung Wook Sim, Won Joon Choe, Min Jee Kim
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Publication number: 20140118001Abstract: The fault current detecting circuit includes: a current detection unit that outputs a current detection signal; a first comparing circuit unit that compares the current detection signal with a predetermined reference current value and outputs a first output signal; a differentiator that differentiates the current detection signal to output a change slope of the current detection signal; a second comparing circuit unit that compares the change slope with a predetermined reference change slope value and outputs a second output signal; a third comparing circuit unit that compares the current detection signal with a predetermined current detection limit reference value and output a third output signal; and a trip determining unit that outputs a trip control signal only when the first output signal and the second output signal are maintained to be received and the third output signal is not received.Type: ApplicationFiled: October 10, 2013Publication date: May 1, 2014Applicant: LSIS CO., LTD.Inventors: Seung Hyun BANG, Hae Yong PARK, Gyeong Ho LEE, Jung Wook SIM, Won Joon CHOE, Min Jee KIM
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Publication number: 20130043017Abstract: Provided is a heat sinking plate, the plate formed with a square-shaped opening of a predetermined length when viewed from the other direction of a rectangular metal plate by erecting four triangles obtained by diagonally and crossly cutting a square of a predetermined length to one direction of the metal plate at a predetermined first angle relative to the metal plate.Type: ApplicationFiled: August 7, 2012Publication date: February 21, 2013Applicant: LSIS CO., LTD.Inventors: Min Jee KIM, Jung Wook SIM, Won Joon CHOE, Gyeong Ho LEE, Seung Hyun BANG, Hae Yong PARK
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Publication number: 20130021067Abstract: Provided is a method for driving an IGBT, wherein a transient voltage applied across the IGBT is reduced by reducing a slope of a gate-emitter voltage of IGBT.Type: ApplicationFiled: June 21, 2012Publication date: January 24, 2013Applicant: LSIS CO., LTD.Inventors: Gyeong Ho LEE, Hae Yong PARK, Seung Hyun BANG, Jung Wook SIM, Won Joon CHOE, Min Jee KIM
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Publication number: 20130021706Abstract: Provided is a fault current limiter, the limiter including a detector detecting an inflow of a fault current and transmitting a turn-on signal to a first switch and transmitting a turn-off signal to a power semiconductor element, the power semiconductor element changed to an OFF state by the turn-off signal, the first switch forming a current limiting circuit by being switched to an ON state by the turn-on signal, and a resistance element blocking the fault current, wherein the series connection between the resistance element and the first switch is connected in parallel to the power semiconductor element.Type: ApplicationFiled: July 6, 2012Publication date: January 24, 2013Applicant: LSIS CO., LTD.Inventors: Jung Wook SIM, Won Joon CHOE, Gyeong Ho LEE, Seung Hyun BANG, Hae Yong PARK, Min Jee KIM
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Publication number: 20130021707Abstract: Provided is a protection coordination system, the system includes a current limiter arranged on a line between a first and a relays to limit a fault current generated to within a predetermined scope.Type: ApplicationFiled: July 11, 2012Publication date: January 24, 2013Applicant: LSIS CO., LTD.Inventors: Seung Hyun BANG, Kwon Bae PARK, Won Joon CHOE, Jung Wook SIM, Gyeong Ho LEE, Hae Yong PARK, Min Jee KIM
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Publication number: 20130021705Abstract: Provided is a fault current limiter, the limiter including a detector detecting an inflow of a fault current and transmitting a turn-off signal to a power semiconductor element; the power semiconductor element changed to an OFF state by the turn-off signal; and a resistance element connected in parallel to the power semiconductor element to block the fault current.Type: ApplicationFiled: July 6, 2012Publication date: January 24, 2013Applicant: LSIS CO., LTD.Inventors: Jung Wook SIM, Won Joon CHOE, Gyeong Ho LEE, Seung Hyun BANG, Min Jee KIM, Hae Yong PARK
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Patent number: 8335060Abstract: The present invention is related to a hybrid fault current limiter comprising a switching unit detaching a moving contact located on a cable and transmitting a trip signal if a fault current is flowed at an electric power system, a semiconductor switching unit connected in series with the switching unit and configured to be turned off to limit the flow of the fault current when the trip signal is transmitted, and a circuit breaking unit connected in parallel to the switching unit and the semiconductor switching unit and configured to limit the fault current detoured from the switching unit and the semiconductor switching unit. The present invention provides rapid treatment for the fault current problem by applying the algorithm sensing the occurrence of the fault current and the algorithm limiting the fault current simultaneously.Type: GrantFiled: March 1, 2011Date of Patent: December 18, 2012Assignee: LS Industrial Systems Co., Ltd.Inventors: Seung Hyun Bang, Kwon Bae Park, Jung Wook Sim, Won Joon Choe, Gyeong Ho Lee
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Patent number: 8228655Abstract: The present disclosure is related to a fault current limiter comprising, a current limiting unit configured to limit a fault current according to a reactance value by increasing the reactance value if the fault current is generated, and a driving unit configured to increases an inductance of the current limiting unit by generating a repulsive force by means of the fault current when the fault current is received and the driving unit is connected to the front end of the current limiting unit.Type: GrantFiled: July 2, 2009Date of Patent: July 24, 2012Assignee: LS Industrial Systems Co., Ltd.Inventors: Kwon Bae Park, Won Joon Choe, Jung Wook Sim, Gyeong Ho Lee
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Publication number: 20110261496Abstract: The present invention is related to a hybrid fault current limiter comprising a switching unit detaching a moving contact located on a cable and transmitting a trip signal if a fault current is flowed at an electric power system, a semiconductor switching unit connected in series with the switching unit and configured to be turned off to limit the flow of the fault current when the trip signal is transmitted, and a circuit breaking unit connected in parallel to the switching unit and the semiconductor switching unit and configured to limit the fault current detoured from the switching unit and the semiconductor switching unit. The present invention provides rapid treatment for the fault current problem by applying the algorithm sensing the occurrence of the fault current and the algorithm limiting the fault current simultaneously.Type: ApplicationFiled: March 1, 2011Publication date: October 27, 2011Inventors: Seung Hyun Bang, Kwon Bae Park, Jung Wook Sim, Won Joon Choe, Gyeong Ho Lee
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Publication number: 20100165532Abstract: The present disclosure is related to a fault current limiter comprising, a current limiting unit configured to limit a fault current according to a reactance value by increasing the reactance value if the fault current is generated, and a driving unit configured to increases an inductance of the current limiting unit by generating a repulsive force by means of the fault current when the fault current is received and the driving unit is connected to the front end of the current limiting unit.Type: ApplicationFiled: July 2, 2009Publication date: July 1, 2010Inventors: Kwon Bae Park, Won Joon Choe, Jung Wook Sim, Gyeong Ho Lee
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Publication number: 20060152331Abstract: Disclosed is a PTC (Positive Temperature Coefficient) current limiting device, which limits a current using PTC characteristics. The device includes a PTC element having the PTC characteristics; and upper and lower contact electrodes arranged to face each other with the PTC element being interposed therebetween, wherein, assuming that a distance from an end of the upper contact electrode to an end of the PTC element is a1, a distance from an end of the lower contact electrode to the end of the PTC element is a2, a thickness of the PTC element is b, and L=a1+a2+b, the following equations are satisfied: V/L<10 and V/b<50, where V is a rated voltage of the PTC current limiting device, a unit for a1, a2 and b is mm, and a unit for V is volt. This PTC current limiting device may prevent generation of flashover between electrodes.Type: ApplicationFiled: January 11, 2006Publication date: July 13, 2006Inventors: Jong-Sung Kang, Ju-Dam Kim, Bang-Wook Lee, Jong-Hwan Lee, Won-Joon Choe
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Publication number: 20060152330Abstract: Disclosed is a PTC (Positive Temperature Coefficient) current limiting device for limiting a current by use of PTC characteristics, which includes a PTC element having the PTC characteristics; a pair of electrode units arranged on both sides to face each other with the PTC element being interposed therebetween; and a molding part prepared around the PTC element and the electrode units to surround at least an interface region between the PTC element and the electrode units, the molding part being made of elastic insulating material. The molding part is made of an elastic insulating material or any insulating materials selected from vacuum, gas and oil. Thus, this device may effectively restrain an arc generated while limiting overcurrent or short circuit current, and also prevent flashover between electrodes.Type: ApplicationFiled: January 10, 2006Publication date: July 13, 2006Inventors: Jong-Sung Kang, Ju-Dam Kim, Bang-Wook Lee, Young-Jun Lee, Won-Joon Choe, Jun-Koo Han