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).
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Patent number: 11031872Abstract: A circuit includes an overshoot-and-undershoot (OU) signal generator generating a signal indicating detection of an overshoot or an undershoot of an output signal of the power converter. The circuit further includes a feedback signal modulator receiving a first feedback signal and the signal indicating detection of the overshoot or the undershoot and generating a second feedback signal in response to the first feedback signal and the signal indicating detection of the overshoot or the undershoot. The feedback signal modulator generates the second feedback signal that is different from the first feedback signal during a predetermined time interval after the signal indicating detection of the overshoot or the undershoot has been asserted.Type: GrantFiled: May 3, 2019Date of Patent: June 8, 2021Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Tae-Sung Kim, Young-Jong Kim
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Patent number: 11025169Abstract: A circuit includes an overload monitor comparing a current sense signal to a threshold signal to generate a comparison result and adjusting a value of a first count signal in response to the comparison result and a monitoring signal. The monitoring signal indicates a time interval during which the overload monitor adjusts the value of the first count signal. The circuit further includes an overload protection signal generator generating an overload protection signal in response to the first count signal, the overload protection signal indicating whether the power converter is operating in an overload condition.Type: GrantFiled: December 16, 2019Date of Patent: June 1, 2021Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Young-Jong Kim
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Patent number: 11026310Abstract: 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: GrantFiled: June 10, 2019Date of Patent: June 1, 2021Assignee: Semiconductor Components Industries, LLCInventors: Young-Jong Kim, Hyun-Chul Eum
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Patent number: 10880966Abstract: 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: GrantFiled: October 3, 2018Date of Patent: December 29, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Young-Jong Kim
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Patent number: 10826399Abstract: A method includes generating a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, and generating a first gain control signal and a second gain control signal in response to the gain transition signal. A gain transition controller includes a transition signal generator generating the gain transition signal and a gain control signal generator generating the first gain control signal and the second gain control signal in response to the gain transition signal.Type: GrantFiled: April 23, 2019Date of Patent: November 3, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Tae-Sung Kim, Young-Mo Yang, Sung-Won Yun, Woo-Kang Jin
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Patent number: 10637350Abstract: 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: GrantFiled: February 21, 2018Date of Patent: April 28, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Taesung Kim, In-Ki Park, Young-Jong Kim
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Publication number: 20200119651Abstract: A circuit includes an overload monitor comparing a current sense signal to a threshold signal to generate a comparison result and adjusting a value of a first count signal in response to the comparison result and a monitoring signal. The monitoring signal indicates a time interval during which the overload monitor adjusts the value of the first count signal. The circuit further includes an overload protection signal generator generating an overload protection signal in response to the first count signal, the overload protection signal indicating whether the power converter is operating in an overload condition.Type: ApplicationFiled: December 16, 2019Publication date: April 16, 2020Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul EUM, Young-Jong KIM
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Patent number: 10541617Abstract: 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: GrantFiled: May 24, 2017Date of Patent: January 21, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Young-Jong Kim
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Patent number: 10530259Abstract: 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: GrantFiled: May 31, 2018Date of Patent: January 7, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Doo-Yong Jung, Young-Jong Kim
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Patent number: 10516327Abstract: 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: GrantFiled: July 19, 2017Date of Patent: December 24, 2019Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Seung-Uk Yang, Wonseok Lim, Hyun-Chul Eum
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Publication number: 20190297694Abstract: 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: ApplicationFiled: June 10, 2019Publication date: September 26, 2019Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Young-Jong KIM, Hyun-Chul EUM
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Publication number: 20190260296Abstract: A circuit includes an overshoot-and-undershoot (OU) signal generator generating a signal indicating detection of an overshoot or an undershoot of an output signal of the power converter. The circuit further includes a feedback signal modulator receiving a first feedback signal and the signal indicating detection of the overshoot or the undershoot and generating a second feedback signal in response to the first feedback signal and the signal indicating detection of the overshoot or the undershoot. The feedback signal modulator generates the second feedback signal that is different from the first feedback signal during a predetermined time interval after the signal indicating detection of the overshoot or the undershoot has been asserted.Type: ApplicationFiled: May 3, 2019Publication date: August 22, 2019Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul EUM, Tae-Sung KIM, Young-Jong KIM
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Publication number: 20190252984Abstract: A method includes generating a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, and generating a first gain control signal and a second gain control signal in response to the gain transition signal. A gain transition controller includes a transition signal generator generating the gain transition signal and a gain control signal generator generating the first gain control signal and the second gain control signal in response to the gain transition signal.Type: ApplicationFiled: April 23, 2019Publication date: August 15, 2019Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul EUM, Tae-Sung KIM, Young-Mo YANG, Sung-Won YUN, Woo-Kang JIN
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Patent number: 10362643Abstract: 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: GrantFiled: June 19, 2017Date of Patent: July 23, 2019Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Young-Jong Kim, Hyun-Chul Eum
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Patent number: 10326370Abstract: 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: GrantFiled: May 24, 2017Date of Patent: June 18, 2019Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Tae-Sung Kim, Young-Jong Kim
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Publication number: 20190170803Abstract: According to the exemplary embodiments, a short-circuit of a sense resistor is detected according to a result of comparison between a sense voltage and a reference voltage at a time based on at least one of a period set based on an input sense voltage and a turn-on time of a power switch. A blanking period is set based on the input sense voltage in a current mode, and a short-circuited resistor detection period is set based on the input sense voltage.Type: ApplicationFiled: February 4, 2019Publication date: June 6, 2019Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: In-Ki PARK, Hyun-Chul EUM, Yong-Sang SHIN
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Patent number: 10291130Abstract: 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: GrantFiled: May 24, 2017Date of Patent: May 14, 2019Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Tae-Sung Kim, Young-Mo Yang, Sung-Won Yun, Woo-Kang Jin
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Patent number: 10241143Abstract: According to the exemplary embodiments, a short-circuit of a sense resistor is detected according to a result of comparison between a sense voltage and a reference voltage at a time based on at least one of a period set based on an input sense voltage and a turn-on time of a power switch. A blanking period is set based on the input sense voltage in a current mode, and a short-circuited resistor detection period is set based on the input sense voltage.Type: GrantFiled: December 11, 2014Date of Patent: March 26, 2019Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: In-Ki Park, Hyun-Chul Eum, Yong-Sang Shin
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Patent number: 10231295Abstract: 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: GrantFiled: May 24, 2017Date of Patent: March 12, 2019Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul Eum, Young-Jong Kim
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Publication number: 20190037655Abstract: 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: ApplicationFiled: October 3, 2018Publication date: January 31, 2019Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Hyun-Chul EUM, Young-Jong KIM