Patents by Inventor Hang-Seok Choi

Hang-Seok 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).

  • Publication number: 20190248125
    Abstract: A system for manufacturing a laminated film, in which a first film and a second film are sequentially laminated, and the system includes: a film supplying part which supplies the first film and the second film; a bonding part which includes a first roll and a second roll that rotate in opposite directions, and compresses the first film and the second film supplied from the film supplying part and bonds the first film and the second film as the laminated film; and a bending inducing part which supports and bends the laminated film bonded and output from the bonding part, in which the second roll shifts in a direction along a circumference of a virtual circle having a larger radius than a radius of the first roll to control the bending of the laminated film.
    Type: Application
    Filed: October 19, 2017
    Publication date: August 15, 2019
    Inventors: Beom Seok LEE, Hang Suk CHOI, Jae Hoon CHOI, Eung Jin JANG, Suk Jae LEE, Ju Young JEOUNG, Kyu Sung HWANG, Sung Kyum KIM
  • Publication number: 20190217550
    Abstract: A system for manufacturing a display unit including: a transport unit which transports an optical film comprising a polarizing film, an adhesive layer, and a release film, by a predetermined transport length and stops the transport of the optical film; a cutting unit which cuts the optical film in a width direction at a predetermined cutting position without cutting the release film; a separating unit which separates the release film from the polarizing film at the cutting position; and an attaching unit which attaches the polarizing film, from which the release film is separated, to a panel. The transport unit includes a horizontal roll satisfying the following conditional expression: I*n<H<I*(n+1) in which I is the predetermined transport length, n is an integer equal to or greater than 0, and H is a horizontal distance between a rotation center of the horizontal roll and the cutting position.
    Type: Application
    Filed: October 16, 2017
    Publication date: July 18, 2019
    Applicant: LG Chem, Ltd.
    Inventors: Beom Seok LEE, Suk Jae LEE, San PARK, Hang Suk CHOI, Eung Jin JANG, Bong Su JEUNG, Jea Han RYOO
  • Publication number: 20190193382
    Abstract: Provided is a system for manufacturing a display unit, the system including: a carrying unit which carries an optical film including a polarizing film including an adhesive layer and a release film to which the polarizing film is bonded to be peeled off through the adhesive layer; a cutting unit which cuts the optical film by a predetermined depth, in which the release film is not cut, and forms a polarizing film sheet piece on the optical film; a peeling unit which peels the polarizing film sheet piece from the release film; and an attachment unit which attaches the polarizing film sheet piece peeled from the release film to a panel, in which the attachment unit includes: a pair of attachment rolls which presses and attaches the polarizing film sheet piece onto one surface of the panel; and a magnetic force generating unit or a suction part, which suppresses an upper attachment roll positioned at an upper side between the pair of attachment rolls from sagging by using magnetic force or suction.
    Type: Application
    Filed: July 17, 2017
    Publication date: June 27, 2019
    Inventors: San PARK, Hang Suk CHOI, Eung Jin JANG, Suk Jae LEE, Kyung Hyeok PARK, Bong Su JEUNG, Jea Han RYOO, Pil Soo NAM, Beom Seok LEE, Yu Jin LIM
  • Patent number: 10324331
    Abstract: The present specification relates to a display unit manufacturing method and an optical film laminating system.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: June 18, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Beom Seok Lee, Kyung Hyeok Park, Hang Suk Choi, Eung Jin Jang, Sukjae Lee, Kyoung sik Kim
  • Publication number: 20190157965
    Abstract: A switch control circuit includes a first pin connected to a first voltage, and a second pin connected to another end of a first resistor including an end connected to the first pin and a first capacitor. In the switch control circuit, at least two of first dead time information, second dead time information, and a protection mode are set by using a multi-voltage of the second pin. The first dead time information is information about a dead time of a first switch and a second switch controlling power supply, the second dead time information is information about a dead time for synchronous rectification, and the protection mode includes an auto-restart mode and a latch mode.
    Type: Application
    Filed: January 7, 2019
    Publication date: May 23, 2019
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Hang-Seok CHOI
  • Patent number: 10293590
    Abstract: A method of continuously manufacturing a display unit according to an exemplary embodiment of the present invention, which bonds sheet pieces of a polarizing film formed by cutting a roll-type optical film into sheet pieces having a predetermined sheet pieces to a panel to manufacture the display unit, continuously carries an optical film, detects a defect of the optical film, extracts a defective area based on information on the detected defect, forms a slit line in a horizontal direction with respect to a carrying direction of the optical film based on the defective area, determines whether the sheet piece of the polarizing film divided by the slit line is a defective sheet piece or a normal sheet piece, peels the sheet piece determined as a normal sheet piece from a release film, and bonds the normal sheet piece and a panel.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: May 21, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Beom Seok Lee, Suk Jae Lee, Kyung Hyeok Park, San Park, Hang Suk Choi, Eung Jin Jang, Bong Su Jeung, Jea Han Ryoo
  • Patent number: 10205376
    Abstract: A switch control circuit includes a first pin connected to a first voltage, and a second pin connected to another end of a first resistor including an end connected to the first pin and a first capacitor. In the switch control circuit, at least two of first dead time information, second dead time information, and a protection mode are set by using a multi-voltage of the second pin. The first dead time information is information about a dead time of a first switch and a second switch controlling power supply, the second dead time information is information about a dead time for synchronous rectification, and the protection mode includes an auto-restart mode and a latch mode.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: February 12, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Hang-Seok Choi
  • Patent number: 10199819
    Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: February 5, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Won-Tae Lee, Ji-Hoon Jang, Hyeong Seok Baek, Hang-Seok Choi
  • Patent number: 10177667
    Abstract: An exemplary embodiment of an alternating valley switching controller is provided. The alternating valley switching controller includes a valley detection circuit and an alternating circuit. The valley detection circuit is coupled to an auxiliary winding of a transformer to generate a valley-detection signal. The alternating circuit alternates a plurality of switching periods of a switching signal according to a blanking-window signal and the valley-detection signal. The blanking-window signal switches between a first voltage level and a second voltage level in the plurality of switching periods. The plurality of switching periods includes at least two first periods and at least two second periods which occur alternately in response to the first voltage level and the second voltage of the blanking-window signal.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: January 8, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Chien-Tsun Hsu, Hang-Seok Choi, Chih-Hsien Hsieh
  • Publication number: 20180294736
    Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.
    Type: Application
    Filed: June 8, 2018
    Publication date: October 11, 2018
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI, Moon-Ho CHOI
  • Patent number: 10014789
    Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: July 3, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi, Moon-Ho Choi
  • Publication number: 20180166993
    Abstract: An exemplary embodiment of an alternating valley switching controller is provided. The alternating valley switching controller includes a valley detection circuit and an alternating circuit. The valley detection circuit is coupled to an auxiliary winding of a transformer to generate a valley-detection signal. The alternating circuit alternates a plurality of switching periods of a switching signal according to a blanking-window signal and the valley-detection signal. The blanking-window signal switches between a first voltage level and a second voltage level in the plurality of switching periods. The plurality of switching periods includes at least two first periods and at least two second periods which occur alternately in response to the first voltage level and the second voltage of the blanking-window signal.
    Type: Application
    Filed: February 9, 2018
    Publication date: June 14, 2018
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Chien-Tsun HSU, Hang-Seok CHOI, Chih-Hsien HSIEH
  • Patent number: 9966867
    Abstract: A synchronous rectifier controller for an adaptive output power converter is provided. The synchronous rectifier controller includes a voltage detection circuit, a threshold generation circuit, and a driver. The voltage detection circuit detects an output voltage of the adaptive output power converter to generate a detection signal. The threshold generation circuit is coupled to the voltage detection circuit. The threshold generation circuit receives the detection signal and generates a synchronous rectifier (SR) turn-off threshold for a synchronous rectifier coupled to a secondary winding of the flyback converter according to the detection signal. The driver receives the SR turn-off threshold and controls the synchronous rectifier according to the SR turn-off threshold.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: May 8, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Jhih-Da Hsu, Hang-Seok Choi
  • Patent number: 9929657
    Abstract: An exemplary embodiment of an alternating valley switching controller is provided. The alternating valley switching controller includes a valley detection circuit and an alternating circuit. The valley detection circuit is coupled to an auxiliary winding of a transformer to generate a valley-detection signal. The alternating circuit alternates a plurality of switching periods of a switching signal according to a blanking-window signal and the valley-detection signal. The blanking-window signal switches between a first voltage level and a second voltage level in the plurality of switching periods. The plurality of switching periods includes at least two first periods and at least two second periods which occur alternately in response to the first voltage level and the second voltage of the blanking-window signal.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: March 27, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Chien-Tsun Hsu, Hang-Seok Choi, Chih-Hsien Hsieh
  • Patent number: 9887633
    Abstract: This disclosure provides control techniques for a resonant converter. In one embodiment, a resonant converter controller includes predictive gate drive circuitry configured to generate a predictive gate drive signal indicative of a time duration from a rising edge of a first drive signal for controlling a conduction state of a first inverter switch of a resonant converter system to a synchronous rectifier (SR) current zero crossing instant of a first SR switch of the resonant converter system, wherein the first tracking signal is based on at least the first drive signal and a voltage drop across the first SR switch. The resonant converter controller may also include SR gate drive shrink circuitry configured to generate an SR gate drive turn on delay signal to increase delay of SR on times in response to detection of a decrease in load current demand of the resonant converter system.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: February 6, 2018
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Hang-Seok Choi
  • Publication number: 20180034261
    Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.
    Type: Application
    Filed: October 11, 2017
    Publication date: February 1, 2018
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
    Inventors: Won-Tae LEE, Ji-Hoon JANG, Hyeong Seok BAEK, Hang-Seok CHOI
  • Patent number: 9825453
    Abstract: A protection mode control circuit includes an auto-restart counter configured to count the cycle of a first signal in a protection condition and to generate an auto-restart signal when a result of the count reaches a protection reference value and a latch mode unit configured to generate a latch mode signal for changing protection mode to latch mode when the auto-restart signal is consecutively generated by a predetermined threshold number.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: November 21, 2017
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Won-Tae Lee, Ji-Hoon Jang, Hyeong Seok Baek, Hang-Seok Choi
  • Patent number: 9812855
    Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: November 7, 2017
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Won-Tae Lee, Ji-Hoon Jang, Hyeong Seok Baek, Hang-Seok Choi
  • Publication number: 20170310231
    Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.
    Type: Application
    Filed: July 10, 2017
    Publication date: October 26, 2017
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
    Inventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI, Moon-Ho CHOI
  • Patent number: 9729072
    Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: August 8, 2017
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi, Moon-Ho Choi