Patents by Inventor Sang Hyun Cha

Sang Hyun Cha 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: 20250180771
    Abstract: A moisture detection circuit for serial bus connectors includes: a current digital-to-analog converter that receives a first digital signal indicating a current reference value and outputs an analog current with a magnitude corresponding to that of the first digital signal to a terminal of the serial bus connector; a voltage digital-to-analog converter that receives a second digital signal indicating a voltage reference value and outputs an analog voltage with a magnitude corresponding to that of the second digital signal; a comparator that compares a voltage of the terminal with a voltage output by the voltage digital-to-analog converter; and a controller that provides a first digital signal indicating the current reference value to the current digital-to-analog converter and provides a second digital signal indicating the voltage reference value to the voltage digital-to-analog converter to determine presence or absence of moisture adhering to the terminal based on comparison results of the comparator.
    Type: Application
    Filed: September 6, 2024
    Publication date: June 5, 2025
    Applicants: SILICON MITUS, INC., Hangzhou Silicon-Magic Semiconductor Technology Co., Ltd.
    Inventors: Hyung Gu Park, Jun Ho Moon, Sang Hyun Cha, Il Kwon Chang
  • Patent number: 9780771
    Abstract: A gate driving circuit may include: a bias unit receiving an input signal having preset high and low signal levels, including a first N-MOSFET turned on in the case in which the input signal has the high level and a first P-MOSFET turned on in the case in which the input signal has the low level, and supplying bias powers by the turning-on of the first N-MOSFET and the first P-MOSFET; and an amplifying unit including a second N-MOSFET turned on by receiving the bias power supplied from the first N-MOSFET in the case in which the input signal has the high level and a second P-MOSFET turned on by receiving the bias power supplied from the first P-MOSFET turned on in the case in which the input signal has the low level and providing a gate signal depending on the turning-on of the second N-MOSFET and the second P-MOSFET.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: October 3, 2017
    Assignee: UNIVERSITY OF SEOUL INDUSTRY COOPERATION FOUNDATION
    Inventors: Sang Hyun Cha, Deuk Hee Park, Yun Joong Lee, Joong Ho Choi, Je Hyeon Yu, Hyeon Seon Yu, Chang Seok Lee
  • Patent number: 9755502
    Abstract: Disclosed herein are a start-up circuit capable of reducing a leakage current to reduce power consumption, and a power device using the same. The start-up circuit includes: a bias unit connected between a first power source and a second power source and allowing a first current to flow from the first power source to the second power source according to a predetermined voltage; a first start unit connected to the bias unit and driving a second current to apply the predetermined voltage to the bias unit, and stopping driving the second current when a voltage received from the second power source reaches a first voltage; and a second start unit connected to the bias unit and driving a third current, the predetermined voltage being applied to the bias unit by the third current, and stopping driving the third current upon receiving a stop signal.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: September 5, 2017
    Assignees: UNIVERSITY OF SEOUL INDUSTRY COOPERATION FOUNDATION, SOLUM CO., LTD.
    Inventors: Sang Hyun Cha, Soo Hyun Moon, Hye Jin Lee, Joong Ho Choi, Ji Hwan Kim, Chang Seok Lee, Yun Joong Lee
  • Patent number: 9301353
    Abstract: A light emitting diode driving apparatus may include: a light emitting diode emitting light by receiving rectified power; a driver driving the light emitting diode based on a voltage level of the rectified power; and a controller limiting an operation of the driver based on a voltage applied to the driver and a hysteresis reference value.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: March 29, 2016
    Assignee: SOLUM CO., LTD
    Inventors: Deuk Hee Park, Sang Hyun Cha, Yun Joong Lee
  • Patent number: 9287777
    Abstract: The present invention relates to an average current controller, an average current control method and a buck converter using the average current controller. The average current controller includes a first comparator for generating a high H signal, a multivibrator for generating a TAVG pulse signal by receiving a high H signal outputted from the first comparator, a timing generator for generating a signal CH_ON to charge/discharge a capacitor by using at least the TAVG pulse signal, an integrator circuit unit for charging/discharging the capacitor, a second comparator for outputting a corresponding signal, an up/down counter for increasing or decreasing a counting value and a digital/analog converter for outputting by converting an output (digital signal) of the up/down counter into an analog signal.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 15, 2016
    Assignee: SOLUM CO., LTD.
    Inventors: Jong Tae Hwang, Chan Woo Park, Sang Hyun Cha, Deuk Hee Park, Yun Joong Lee
  • Patent number: 9204506
    Abstract: A light emitting diode (LED) driving apparatus includes a power converting unit and a driving controlling unit. The power converting unit switches input power to supply driving power to at least one LED. In one example, the driving controlling unit controls the supplying of the power based on a switching period of the power converting unit and a demagnetization time in the switching period. In another example, the driving controlling unit controls the supplying of the power based on the input power, a switching period of the power converting unit, and a drain voltage by the switching.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: December 1, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Hyun Cha, Yun Joong Lee, Je Hyeon Yu
  • Publication number: 20150318779
    Abstract: Disclosed herein are a start-up circuit capable of reducing a leakage current to reduce power consumption, and a power device using the same. The start-up circuit includes: a bias unit connected between a first power source and a second power source and allowing a first current to flow from the first power source to the second power source according to a predetermined voltage; a first start unit connected to the bias unit and driving a second current to apply the predetermined voltage to the bias unit, and stopping driving the second current when a voltage received from the second power source reaches a first voltage; and a second start unit connected to the bias unit and driving a third current, the predetermined voltage being applied to the bias unit by the third current, and stopping driving the third current upon receiving a stop signal.
    Type: Application
    Filed: April 23, 2015
    Publication date: November 5, 2015
    Applicants: Samsung Electro-Mechanics Co., Ltd., University of Seoul Industry Cooperation Foundation
    Inventors: Sang Hyun CHA, Soo Hyun MOON, Hye Jin LEE, Joong Ho CHOI, Ji Hwan KIM, Chang Seok LEE, Yun Joong LEE
  • Patent number: 9173265
    Abstract: There are provided a light emitting diode (LED) driving apparatus and an LED lighting apparatus, in which a common detection resistor detecting a current flowing in each LED is used. According to exemplary embodiments of the present disclosure, manufacturing costs and a circuit area may be reduced by commonly using a common detection resistor detecting a current flowing in each of the LEDs.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: October 27, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Deuk Hee Park, Chan Woo Park, Yun Joong Lee, Jong Tae Hwang, Je Hyeon Yu, Soo Hyun Moon, Hye Jin Lee, Chang Seok Lee, Sang Hyun Cha
  • Patent number: 9083248
    Abstract: Disclosed herein are a PWM control circuit, a flyback converter, and a PWM control method. The PWM control circuit includes: a peak storing and reference signal generating unit storing a peak value of one period of a feedback signal from a secondary side output and inverting the peak signal and outputting the inverted peak signal as a reference signal; and a PWM control signal generating unit generating a PWM control signal by using an output obtained by comparing the reference signal with a reference waveform from the peak storing and reference signal generating unit. In addition, the flyback converter including the same and the method for controlling PWM are proposed.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: July 14, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Deuk Hee Park, Yun Joong Lee, Sang Hyun Cha, Jae Shin Lee, Chang Seok Lee
  • Patent number: 9066399
    Abstract: There is provided an illumination driving apparatus for a light emitting diode, the apparatus including: a light emitting unit including M number of light emitting diodes (LEDs) connected in series and driven by an output voltage rectified in a rectifying unit; an LED switch unit including N number of LED switches connected in parallel with at least N number of the M LEDs, respectively, and connected in series; an LED switch control signal generating unit comparing the output voltage of the rectifying unit with each of the first to Nth preset reference voltages to generate N number of LED switch control signals controlling the LED switch unit; and an LED switch controlling unit transferring the N number of LED switch control signals to the LED switch unit.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 23, 2015
    Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., UNIVERSITY OF SEOUL INDUSTRY COOPERATION FOUNDATION
    Inventors: Deuk Hee Park, Joong Ho Choi, Sang Hyun Cha, Jae Shin Lee, Chang Seok Lee, Yun Joong Lee
  • Publication number: 20150173149
    Abstract: There are provided a light emitting diode (LED) driving apparatus and an LED lighting apparatus, in which a common detection resistor detecting a current flowing in each LED is used. According to exemplary embodiments of the present disclosure, manufacturing costs and a circuit area may be reduced by commonly using a common detection resistor detecting a current flowing in each of the LEDs.
    Type: Application
    Filed: June 3, 2014
    Publication date: June 18, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Deuk Hee PARK, Chan Woo PARK, Yun Joong LEE, Jong Tae HWANG, Je Hyeon YU, Soo Hyun MOON, Hye Jin LEE, Chang Seok LEE, Sang Hyun CHA
  • Patent number: 9024531
    Abstract: There is provided an apparatus for driving a light emitting diode (LED), capable of distributing current stress applied to the LED. The apparatus includes an LED part including a plurality of LED units respectively including at least one LED, the plurality of LED units being connected in parallel to a power input terminal to which rectified power in sine wave form is supplied, and, among the plurality of LED units connected in parallel, a termination end of the LED unit in a front end being connected to a middle of an adjacent LED unit; and a current source unit including a plurality of current sources respectively connected to termination ends of the plurality of LED units and allowing corresponding current to flow through the plurality of LED units.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: May 5, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jong Tae Hwang, Deuk Hee Park, Jae Shin Lee, Yun Joong Lee, Sang Hyun Cha
  • Publication number: 20150115822
    Abstract: A light emitting diode (LED) driving apparatus may include: a power converting unit switching input power to supply driving power to at least one LED; and a driving controlling unit controlling the supplying of the power of the power converting unit based on a switching period of the power converting unit and a demagnetization time in the switching period.
    Type: Application
    Filed: May 27, 2014
    Publication date: April 30, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Hyun CHA, Yun Joong LEE, Je Hyeon YU
  • Publication number: 20150115821
    Abstract: There is provided a light emitting diode (LED) driver including: a power supplying unit including a dimmer and a rectifying unit and supplying a supply voltage to an LED device; and a control unit acquiring section information regarding the supply voltage and setting an LED on-time based on the section information.
    Type: Application
    Filed: January 24, 2014
    Publication date: April 30, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Je Hyeon YU, Deuk Hee PARK, Yun Joong LEE, Sang Hyun CHA, Chang Seok LEE, Hye Jin LEE
  • Publication number: 20150116013
    Abstract: There is provided an integrated circuit controlling a power supply, the integrated circuit including: an HV pin obtaining startup power; a voltage dividing unit connected to the HV pin; and an input voltage detecting unit detecting an input voltage through voltage distribution by the voltage dividing unit. The integrated circuit may be capable of reducing manufacturing costs by omitting a separate voltage sensing pin.
    Type: Application
    Filed: May 8, 2014
    Publication date: April 30, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Je Hyeon YU, Yun Joong LEE, Sang Hyun CHA, Chang Seok LEE, Hye Jin LEE, Deuk Hee PARK
  • Publication number: 20150115819
    Abstract: A light emitting diode driving apparatus may include: a light emitting diode emitting light by receiving rectified power; a driver driving the light emitting diode based on a voltage level of the rectified power; and a controller limiting an operation of the driver based on a voltage applied to the driver and a hysteresis reference value.
    Type: Application
    Filed: April 25, 2014
    Publication date: April 30, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Deuk Hee PARK, Sang Hyun CHA, Yun Joong LEE
  • Publication number: 20150115828
    Abstract: A light emitting diode driving apparatus may include a power supplying unit receiving phase-controlled power and supplying operation power having a preset level, a driving unit receiving the operation power from the power supplying unit to drive a light emitting diode unit receiving the phase-controlled power, and a noise current limiting unit decreasing a noise current due to a parasitic capacitance component of the driving unit.
    Type: Application
    Filed: July 9, 2014
    Publication date: April 30, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Hyun Cha, Hye Jin Lee, Deuk Hee Park, Yun Joong Lee
  • Publication number: 20150117065
    Abstract: A gate driving circuit may include: a bias unit receiving an input signal having preset high and low signal levels, including a first N-MOSFET turned on in the case in which the input signal has the high level and a first P-MOSFET turned on in the case in which the input signal has the low level, and supplying bias powers by the turning-on of the first N-MOSFET and the first P-MOSFET; and an amplifying unit including a second N-MOSFET turned on by receiving the bias power supplied from the first N-MOSFET in the case in which the input signal has the high level and a second P-MOSFET turned on by receiving the bias power supplied from the first P-MOSFET turned on in the case in which the input signal has the low level and providing a gate signal depending on the turning-on of the second N-MOSFET and the second P-MOSFET.
    Type: Application
    Filed: May 27, 2014
    Publication date: April 30, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Hyun CHA, Deuk Hee PARK, Yun Joong LEE, Joong Ho CHOI, Je Hyeon YU, Hyeon Seon YU, Chang Seok LEE
  • Patent number: 8994281
    Abstract: There is provided a light emitting diode driving apparatus capable of supplying a constant average current to a light emitting diode by generating a reference voltage used for driving the light emitting diode according to input power and a switching signal switching a path of a current supplied to the light emitting diode. The light emitting diode driving apparatus includes: a reference voltage generating unit generating a reference voltage set based on input power and a switching signal for supplying driving power to a light emitting diode; and a driving unit supplying the driving power to the light emitting diode according to the reference voltage.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: March 31, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jong Tae Hwang, Deuk Hee Park, Sang Hyun Cha, Chang Seok Lee, Yun Joong Lee
  • Patent number: 8981658
    Abstract: There is provided an apparatus for driving a light emitting diode (LED), performing switching-operation with respect to a pair of LED groups by a phase difference of 180 degrees. The apparatus includes a switching unit that alternately switches a first LED unit and a second LED unit of at least one pair of LED units emitting light by receiving rectified power, in accordance with a predetermined phase difference, a current limiting unit that limits a current flowing in the at least one pair of LED units through the switching of the switching unit, and a driving control unit that controls switching driving of the switching unit in accordance with a voltage level of the rectified power.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: March 17, 2015
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Yun Joong Lee, Je Hyeon Yu, Sang Hyun Cha, Deuk Hee Park