Patents by Inventor Hyun-Chul EUM

Hyun-Chul EUM 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: 20190028016
    Abstract: A method for controlling a power converter includes receiving an input signal through an input node and generating an intermediate signal using a capacitor, generating a control signal in response to the input signal and the intermediate signal, coupling or decoupling the input node and the capacitor in response to the control signal, and generating an output signal in response to the intermediate signal. A circuit for controlling a power converter includes an input node receiving an input signal, a first capacitor providing an intermediate signal, a detection circuit generating a control signal in response to the input signal and the intermediate signal, a switching device coupling the input node and the first capacitor in response to the control signal, and a regulator generating an output signal in response to the intermediate signal.
    Type: Application
    Filed: July 19, 2017
    Publication date: January 24, 2019
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Seung-Uk YANG, Wonseok LIM, Hyun-Chul EUM
  • Publication number: 20180278165
    Abstract: An LED driving device includes an LED string including at least first and second LED elements connected in series, first and second channels coupled to output nodes of the first and second LED elements, respectively, first and second regulators to regulate a current flowing through the first and second channels in response to first and second control voltages, respectively, and a control voltage generating circuit to generate the first and second control voltages based on a difference between a reference voltage and a comparative voltage, the comparative voltage being generated based on a sensing voltage, the sensing voltage corresponding to an LED current flowing through the LED string. The control voltage generating circuit includes a reference voltage generator to generate the reference voltage based on an input voltage and the dimming signal, the input voltage being supplied to the LED string, the dimming signal controlling dimming of the LED string.
    Type: Application
    Filed: May 31, 2018
    Publication date: September 27, 2018
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Hyun-Chul EUM, Doo-Yong JUNG, Young-Jong KIM
  • Publication number: 20180183326
    Abstract: A power factor correction circuit corrects a filter current flowing through a filter capacitor asymmetrically based on a peak of an input voltage by controlling a switching operation of a power switch, thereby correcting distortion of an input current.
    Type: Application
    Filed: February 21, 2018
    Publication date: June 28, 2018
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Hyun-Chul EUM, Taesung KIM, In-Ki PARK, Young-Jong KIM
  • Patent number: 10004121
    Abstract: A LED driving device is provided, which includes a LED string including at least one LED element, at least one channel connected to the at least one LED element, a current regulator configured to regulate a current flowing through the at least one channel according to at least one corresponding control voltage, and a control signal generating circuit configured to generate a control signal based on a difference between a reference voltage and a comparative voltage. The comparative voltage is determined based on a sensing voltage, and the sensing voltage corresponds to an LED current flowing through the LED string. The control signal generating circuit is further configured to generate the at least one corresponding control voltage based on the control signal.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: June 19, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Hyun-Chul Eum, Doo-Yong Jung, Young-Jong Kim
  • Patent number: 9979303
    Abstract: A primary-side regulation (PSR) power supply device according to the invention includes: a power switch; an auxiliary wiring from which an auxiliary voltage that depends on an output voltage is generated during a turn-off period of the power switch and being provided in a primary side; a clamping circuit clamping a voltage corresponding to the auxiliary voltage to a predetermined voltage; a voltage follower decreasing the sense voltage according to a decrease of the auxiliary voltage; and a switch control circuit controlling a switching operation of the power switch by using the sense voltage.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: May 22, 2018
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Hyun-Chul Eum, In-Ki Park, Eung-Woo Lee
  • Patent number: 9935538
    Abstract: A power factor correction circuit corrects a filter current flowing through a filter capacitor asymmetrically based on a peak of an input voltage by controlling a switching operation of a power switch, thereby correcting distortion of an input current.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: April 3, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Hyun-Chul Eum, Taesung Kim, In-Ki Park, Young-Jong Kim
  • Publication number: 20180014369
    Abstract: A light emitting diode (LED) driver circuit includes an LED string and a conducting state detection circuit. The conducting state detection circuit detects a conducting state of the LED string, and generates a discharge control signal upon sensing that the LED string is in a non-conducting state. A current source generates a discharge current according to the discharge control signal when the LED string is in the non-conducting state. A passive bleeder provides current compensation by internal regulator operation. An LED spike current suppression circuit suppresses spike current that can occur when the input voltage increases above a threshold. A bias supply circuit has an input capacitor that provides a bias voltage.
    Type: Application
    Filed: June 19, 2017
    Publication date: January 11, 2018
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
    Inventors: Young-Jong KIM, Hyun-Chul EUM
  • Publication number: 20170354008
    Abstract: A LED driving device is provided, which includes a LED string including at least one LED element, at least one channel connected to the at least one LED element, a current regulator configured to regulate a current flowing through the at least one channel according to at least one corresponding control voltage, and a control signal generating circuit configured to generate a control signal based on a difference between a reference voltage and a comparative voltage. The comparative voltage is determined based on a sensing voltage, and the sensing voltage corresponds to an LED current flowing through the LED string. The control signal generating circuit is further configured to generate the at least one corresponding control voltage based on the control signal.
    Type: Application
    Filed: May 24, 2017
    Publication date: December 7, 2017
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR, LTD.
    Inventors: Hyun-Chul EUM, Doo-Yong JUNG, Young-Jong KIM
  • Publication number: 20170353103
    Abstract: A method includes comparing a value of a current sense signal indicating an output signal of a power converter to a value of a threshold signal, adjusting a value of a first count signal in response to the comparison result, and determining whether or not the power converter is operating in an overload condition using the first count signal. A circuit includes an overload monitor comparing a value of a current sense signal to a value of a threshold signal, adjusting a value of a first count signal in response to the comparison result, and determining whether or not the power converter is operating in an overload condition using the first count signal. The circuit further includes an overload protection signal generator generating an overload protection signal indicating whether or not the power converter is operating in the overload condition.
    Type: Application
    Filed: May 24, 2017
    Publication date: December 7, 2017
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR, LTD.
    Inventors: Hyun-Chul EUM, Young-Jong KIM
  • Publication number: 20170353112
    Abstract: A method includes generating a first feedback signal in response to a tracking signal indicating an output signal of the power converter. The method further includes detecting an overshoot of the tracking signal or an undershoot of the tracking signal, generating a second feedback signal in response to the detection result and the first feedback signal, and generating a modulation signal in response to the second feedback signal. A circuit includes an overshoot-and-undershoot (OU) signal generator detecting an overshoot of a tracking signal or an undershoot of the tracking signal. The circuit further includes a feedback signal modulator receiving a first feedback signal and generating a second feedback signal in response to the detection result and the first feedback signal and a modulation controller generating a modulation signal in response to the second feedback signal.
    Type: Application
    Filed: May 24, 2017
    Publication date: December 7, 2017
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR, LTD.
    Inventors: Hyun-Chul EUM, Tae-Sung KIM, Young-Jong KIM
  • Publication number: 20170354002
    Abstract: A circuit comprises an amplifier and a plurality of channels, the plurality of channels including respective transistors. The respective transistors of the channels control respective magnitudes of respective currents of the channels according to an output of the amplifier. The respective transistors of the plurality of channels may be included in an auto-commutated circuit. A first Light Emitting Diode (LED) circuit may be coupled between a power source and a first channel of the plurality of channels. A second LED circuit may be coupled between the first channel and a second channel of the plurality of LED channels. The power source may provide rectified Alternating Current (AC).
    Type: Application
    Filed: May 24, 2017
    Publication date: December 7, 2017
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR, LTD.
    Inventors: Hyun-Chul EUM, Young-Jong KIM
  • Publication number: 20170353167
    Abstract: A method includes generating a first gain control signal and a second gain control signal in response to a gain transition signal indicating a transition of a power converter from a first gain mode to a second gain mode. The method further includes causing the power converter to enter the first gain mode in response to the first gain control signal, and causing the power converter to enter the second gain mode in response to the second gain control signal. A circuit includes a gain transition controller generating a first gain control signal and a second gain control signal in response to a gain transition signal, and a gain control circuit causing the power converter to enter the first gain mode in response to the first gain control signal and causing the power converter to enter the second gain mode in response to the second gain control signal.
    Type: Application
    Filed: May 24, 2017
    Publication date: December 7, 2017
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR, LTD.
    Inventors: Hyun-Chul EUM, Tae-Sung KIM, Young-Mo YANG, Sung-Won YUN, Woo-Kang JIN
  • Patent number: 9800136
    Abstract: An active damper and a power supply according to exemplary embodiments include: a damper resistor coupled to an input voltage; a damper switch coupled in parallel with the damper resistor; and a capacitor to which a reset current generated by a leading edge of the input voltage flows. The damper switch is turned off by the reset current.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: October 24, 2017
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Hyun-Chul Eum, Young-Jong Kim
  • Patent number: 9748849
    Abstract: Provided is regulation of a line current. The regulation of the line current includes comparing a reference voltage with a line sensing voltage to generate a feedback voltage, and controlling a switching operation of a power switch using the feedback voltage. The reference voltage may be a voltage having a constant level, a voltage which varies according to an output current, or a voltage which follows a sine wave to compensate a power factor. Provided is sensing of an output current. The sensing of the output current includes sensing the output current using a feedback voltage corresponding to a voltage between both terminals of an inductor connected to a power switch, a peak of current flowing through the power switch, and a switching cycle of the power switch.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: August 29, 2017
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Hyun-Chul Eum, Young-Jong Kim, In-Ki Park
  • Patent number: 9680455
    Abstract: A power supply includes a power switch and a switch control circuit controlling a switching operation of the power switch using a comparison voltage generated according to an output, determining a clamping voltage by sensing an input voltage during a start-up period, and clamping the comparison voltage to the clamping voltage during the start-up period.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: June 13, 2017
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: In-Ki Park, Hyun-Chul Eum, Chi-Yin Lo
  • Patent number: 9647564
    Abstract: A power supply device according to the present invention includes: a filter capacitor coupled to a line to which an input voltage that is passed through a dimmer is supplied; a discharge switch coupled to the filter capacitor through the line; and a main switch receiving the input voltage and controlling power transmission. The power supply device performs input voltage control for shaping the input voltage with a predetermined pattern using the discharge switch.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: May 9, 2017
    Assignee: Fairchild Korea Semiconductor LTD
    Inventors: Hyun-Chul Eum, Young-Jong Kim, In-Ki Park
  • Patent number: 9502983
    Abstract: A power supply device includes a power switch, a power delivering means configured to convert an input in accordance with switching operation of the power switch and output a result, and a switch control circuit configured to linearly control switching frequency of the power switch in accordance with an output detection voltage corresponding to an output voltage according to the output.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: November 22, 2016
    Assignee: Fairchild Korea Semiconductor LTD.
    Inventors: Kyung-Oun Jang, In-Ki Park, Hyun-Chul Eum, Sung-Won Yun
  • Patent number: 9467137
    Abstract: A switch control circuit that controls a switching operation of a power switch includes: an input current calculator generating an input sense voltage by integrating a sense voltage that indicates a switching current flowing to the power switch for a switching period unit of the power switch; and an input current comparator generating a gate-off signal according to a result of comparison between the input sense voltage and a predetermined input reference voltage, wherein the power switch is turned off according to the gate-off signal.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: October 11, 2016
    Assignee: Fairchild Korea Semiconductor LTD.
    Inventors: Hyun-Chul Eum, Young-Jong Kim
  • Publication number: 20160285359
    Abstract: A power factor correction circuit corrects a filter current flowing through a filter capacitor asymmetrically based on a peak of an input voltage by controlling a switching operation of a power switch, thereby correcting distortion of an input current.
    Type: Application
    Filed: March 22, 2016
    Publication date: September 29, 2016
    Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
    Inventors: Hyun-Chul EUM, Taesung KIM, In-Ki PARK, Young-Jong KIM
  • Patent number: 9362843
    Abstract: The present invention relates to a switch controller, a power supply including the same, and a method for driving the same. An AC input of the power supply is connected to a rectification circuit. The power supply includes a power switch to which an input current passed through the rectification circuit flows during an on-period and a switch controller, the switch controller detects a half-on time point that is the intermediate time point of the on-period, detects a sense voltage that is determined by a current flowing to the power switch during the on-period at the half-on time point, generates a modulation wave by controlling a reference wave according to the detected voltage, and controls switching operation of the power switch according to the modulation wave.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: June 7, 2016
    Assignee: Fairchild Korea Semiconductor LTD
    Inventors: Hyun-Chul Eum, Seung-Uk Yang