Patents by Inventor Chel Ho CHUNG

Chel Ho CHUNG 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: 20240235562
    Abstract: The present disclosure relates to a deadlock recovery unit for applying a one-shot pulse signal to restart a Voltage Controlled Oscillator (VCO) when the output clock signal of the VCO remains in a high state or a low state. The deadlock recovery unit includes a VCO clock monitoring unit for monitoring a clock signal of a voltage control oscillator; a pulse signal generating unit for outputting a one-shot pulse signal to reset the VCO when a clock signal is not counted; and a control signal generating unit for generating a VCO counter enable signal applied to the VCO clock monitoring unit and a detector clock signal applied to the pulse signal generating unit by using an externally supplied reference clock signal.
    Type: Application
    Filed: November 9, 2023
    Publication date: July 11, 2024
    Applicant: Magnachip Semiconductor, Ltd.
    Inventors: Chel Ho CHUNG, Gil Sung ROH
  • Patent number: 11514862
    Abstract: A device for increasing a slew rate of a driving amplifier includes a driving amplifier, a slew rate improvement circuit, and a controller. The driving amplifier is configured to amplify an input voltage and output an output voltage. The slew rate improvement circuit is configured to provide or receive a current to increase the slew rate of the driving amplifier. The controller is configured to control an operation of the slew rate improvement circuit based on a difference between a first code corresponding to the input voltage of the driving amplifier during a current horizontal line time and a second code corresponding to the input voltage during a next horizontal line time.
    Type: Grant
    Filed: July 21, 2021
    Date of Patent: November 29, 2022
    Assignee: MagnaChip Semiconductor, Ltd.
    Inventors: Dong Ho Kim, Chel Ho Chung, Hee Jung Kim, Hyeong Sik Choi
  • Publication number: 20220122542
    Abstract: A device for increasing a slew rate of a driving amplifier includes a driving amplifier, a slew rate improvement circuit, and a controller. The driving amplifier is configured to amplify an input voltage and output an output voltage. The slew rate improvement circuit is configured to provide or receive a current to increase the slew rate of the driving amplifier. The controller is configured to control an operation of the slew rate improvement circuit based on a difference between a first code corresponding to the input voltage of the driving amplifier during a current horizontal line time and a second code corresponding to the input voltage during a next horizontal line time.
    Type: Application
    Filed: July 21, 2021
    Publication date: April 21, 2022
    Applicant: MagnaChip Semiconductor, Ltd.
    Inventors: Dong Ho KIM, Chel Ho CHUNG, Hee Jung KIM, Hyeong Sik CHOI
  • Publication number: 20180356227
    Abstract: A processor-implemented method based on an acceleration sensor and a geomagnetic sensor for determining an angular velocity of an object includes: deriving a state variable and a variance of the state variable based on an error quaternion and converting a quaternion-based rotation matrix into an error quaternion-based rotation matrix; calculating an observation matrix and an output matrix of the Kalman filter based on the error quaternion-based rotation matrix; calculating a gain of the Kalman filter based on the transferred variance of the state variable and the observation matrix of the Kalman filter after transferring the state variable and the variance of the state variable through a discretized transfer matrix; calculating a quaternion-based on a calibrated state variable and an estimated quaternion after calibrating the state variable and the variance of the state variable through the gain of the Kalman filter; and calculating angular velocity based on the quaternion.
    Type: Application
    Filed: May 21, 2018
    Publication date: December 13, 2018
    Applicant: Haechitech Corporation
    Inventors: Dong Yoon KIM, Seong Min CHOE, Chel Ho CHUNG
  • Patent number: 9608432
    Abstract: An electric leakage determination circuit for an electric leakage circuit breaker according to the invention comprises a zero current transformer on an alternating-current circuit to provide an electric leakage detection signal upon occurrence of electric leakage, a filter circuit unit connected to an output terminal of the zero current transformer to remove noise, and an electric leakage determination circuit unit comparing a voltage value of the electric leakage detection signal with a first reference voltage value, to be charged with electric charges when the voltage value is not smaller than the first reference voltage value and discharge electric charges when being smaller than the first reference voltage value, and comparing a charged voltage value with a second reference voltage value to determine occurrence of electric leakage when the charged voltage value is not smaller than the second reference voltage value.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: March 28, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Dong Hyun Kim, Jong Kug Seon, Chel Ho Chung
  • Publication number: 20160013630
    Abstract: An electric leakage determination circuit for an electric leakage circuit breaker according to the invention comprises a zero current transformer on an alternating-current circuit to provide an electric leakage detection signal upon occurrence of electric leakage, a filter circuit unit connected to an output terminal of the zero current transformer to remove noise, and an electric leakage determination circuit unit comparing a voltage value of the electric leakage detection signal with a first reference voltage value, to be charged with electric charges when the voltage value is not smaller than the first reference voltage value and discharge electric charges when being smaller than the first reference voltage value, and comparing a charged voltage value with a second reference voltage value to determine occurrence of electric leakage when the charged voltage value is not smaller than the second reference voltage value.
    Type: Application
    Filed: June 12, 2015
    Publication date: January 14, 2016
    Applicant: LSIS CO., LTD.
    Inventors: Dong Hyun KIM, Jong Kug SEON, Chel Ho CHUNG
  • Patent number: 8803592
    Abstract: A data persistence control apparatus for an RFID tag is provided. The apparatus includes a capacitor to be charged, a charge circuit to charge the capacitor, a discharge circuit to discharge the capacitor, a switch switched on to electrically connect the charge circuit to the capacitor or the discharge circuit to the capacitor, and an output circuit to output a logic high signal or a logic low signal according to an input voltage determined based on a discharged degree of the capacitor.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: August 12, 2014
    Assignee: LSIS Co., Ltd.
    Inventor: Chel Ho Chung
  • Publication number: 20140118061
    Abstract: A demodulation apparatus comprises: an envelope detecting unit configured to receive a signal from the outside and detect an envelope signal from the received signal; a reference voltage generating unit configured to generate a reference voltage on the basis of the detected envelope signal; a comparator configured to output a pulse signal on the basis of the envelope signal detected by the envelope detecting unit and the reference voltage generated by the reference voltage generating unit; and an input signal adjusting unit connected with an envelope signal input terminal of the comparator to selectively adjust a magnitude of the envelope signal input to the comparator.
    Type: Application
    Filed: October 7, 2013
    Publication date: May 1, 2014
    Applicant: LSIS CO., LTD.
    Inventors: Chel Ho CHUNG, Young-Han KIM
  • Publication number: 20140028352
    Abstract: A data persistence control apparatus for an RFID tag is provided. The apparatus includes a capacitor to be charged, a charge circuit to charge the capacitor, a discharge circuit to discharge the capacitor, a switch switched on to electrically connect the charge circuit to the capacitor or the discharge circuit to the capacitor, and an output circuit to output a logic high signal or a logic low signal according to an input voltage determined based on a discharged degree of the capacitor.
    Type: Application
    Filed: June 26, 2013
    Publication date: January 30, 2014
    Inventor: Chel Ho CHUNG