Patents by Inventor Ok Hwan Kwon
Ok Hwan Kwon 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: 9793797Abstract: Disclosed are a switching apparatus including an internal circuit using an inductive element and a control method thereof. The switching apparatus includes a switch that regulates a current of the inductive element, and a signal control circuit that arithmetically calculates a turn-off time point of the switch by using a monitoring voltage corresponding to the current of the inductive element, a sampling voltage of the monitoring voltage, and a reference voltage corresponding to a target average current of the inductive element, and controls the switch.Type: GrantFiled: February 26, 2015Date of Patent: October 17, 2017Assignee: SILICON WORKS CO., LTD.Inventors: Wanyuan Qu, Se Won Lee, Ju Pyo Hong, Ok Hwan Kwon, Hai Feng Jin, Sung Hwan Kim, Ju Hyun Lee, Jin Won Mok, Ju Yeong Kim
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Patent number: 9653993Abstract: A signal control circuit and a switching apparatus are provided. The switching apparatus includes: a switch for controlling a current flowing through an inductive element; a monitoring node connected with the switch; and a signal control circuit, connected with the monitoring node and a reference voltage, for turning on/off the switch, wherein the signal control circuit includes an integrator for generating a comparison voltage by using a monitoring voltage of the monitoring node and the reference voltage, wherein the integrator includes: a resistor unit; a capacitor unit; and an auto-calibrator for receiving at least one selection signal and determining at least one of a resistance of the resistor unit and a capacitance of the capacitor unit, during a power-up period, and allowing a peak value of the comparison voltage to fall within a target range.Type: GrantFiled: May 20, 2015Date of Patent: May 16, 2017Assignee: Silicon Works Co., Ltd.Inventors: Ok Hwan Kwon, Baek Min Lim, Hai Feng Jin, Ju Pyo Hong, Sung Hwan Kim, Ju Hyun Lee, Jin Won Mok, Ju Yeong Kim
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Patent number: 9603215Abstract: The present invention relates to an AC LED driving circuit that can greatly improve flicker-free characteristics and implement an excellent power factor. The AC LED driving circuit according to the present invention includes an LED lighting unit connected to an output terminal of a power supply unit, a current channel switching unit connected to an output terminal of the LED lighting unit to form a current supply channel for the LED lighting unit, a voltage charging unit connected in parallel with a connection line between the power supply unit and the LED lighting unit and configured to charge a voltage from the power supply unit, and have a switching function for the LED lighting unit to selectively supply a charged voltage to the LED lighting unit, and a charged voltage switching control unit for controlling a switching function of the voltage charging unit.Type: GrantFiled: October 28, 2014Date of Patent: March 21, 2017Assignee: MERLOT LABORATORIES INC.Inventors: So-Bong Shin, Ok Hwan Kwon
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Publication number: 20160278177Abstract: The present invention relates to an AC LED driving circuit that can greatly improve flicker-free characteristics and implement an excellent power factor. The AC LED driving circuit according to the present invention includes an LED lighting unit connected to an output terminal of a power supply unit, a current channel switching unit connected to an output terminal of the LED lighting unit to form a current supply channel for the LED lighting unit, a voltage charging unit connected in parallel with a connection line between the power supply unit and the LED lighting unit and configured to charge a voltage from the power supply unit, and have a switching function for the LED lighting unit to selectively supply a charged voltage to the LED lighting unit, and a charged voltage switching control unit for controlling a switching function of the voltage charging unit.Type: ApplicationFiled: October 28, 2014Publication date: September 22, 2016Applicant: Merlot Laboratories Inc.Inventors: So-Bong SHIN, Ok Hwan KWON
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Publication number: 20150340945Abstract: A signal control circuit and a switching apparatus are provided. The switching apparatus includes: a switch for controlling a current flowing through an inductive element; a monitoring node connected with the switch; and a signal control circuit, connected with the monitoring node and a reference voltage, for turning on/off the switch, wherein the signal control circuit includes an integrator for generating a comparison voltage by using a monitoring voltage of the monitoring node and the reference voltage, wherein the integrator includes: a resistor unit; a capacitor unit; and an auto-calibrator for receiving at least one selection signal and determining at least one of a resistance of the resistor unit and a capacitance of the capacitor unit, during a power-up period, and allowing a peak value of the comparison voltage to fall within a target range.Type: ApplicationFiled: May 20, 2015Publication date: November 26, 2015Inventors: Ok Hwan KWON, Baek Min LIM, Hai Feng JIN, Ju Pyo HONG, Sung Hwan KIM, Ju Hyun LEE, Jin Won MOK, Ju Yeong KIM
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Patent number: 9144128Abstract: A dimming system of a lamp using a light-emitting device includes: a power source including a power input terminal, a dimmer connected to the power input terminal, and a rectifier circuit; a lighting unit including light-emitting devices from a first light-emitting device to an nth light-emitting device; a light-emitting drive unit including a plurality of switching circuits individually connected to an output terminal of each of the light-emitting devices, and dimmer control circuits connected to the switching circuits of the first light-emitting device and configured to sense whether or not a current supply channel for the first light-emitting device is normally operated, and to output a control signal; and a dimmer drive unit parallel-connected to a connection line between the power source and a power input terminal of the first light-emitting device to form a bleeding current supply channel, and having a switch.Type: GrantFiled: March 7, 2014Date of Patent: September 22, 2015Assignee: MERLOT LABORATORIES, INC.Inventors: So-Bong Shin, Ok Hwan Kwon
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Publication number: 20150249388Abstract: Disclosed are a switching apparatus including an internal circuit using an inductive element and a control method thereof. The switching apparatus includes a switch that regulates a current of the inductive element, and a signal control circuit that arithmetically calculates a turn-off time point of the switch by using a monitoring voltage corresponding to the current of the inductive element, a sampling voltage of the monitoring voltage, and a reference voltage corresponding to a target average current of the inductive element, and controls the switch.Type: ApplicationFiled: February 26, 2015Publication date: September 3, 2015Inventors: Wanyuan QU, Se Won LEE, Ju Pyo HONG, Ok Hwan KWON, Hai Feng JIN, Sung Hwan KIM, Ju Hyun LEE, Jin Won MOK, Ju Yeong KIM
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Publication number: 20150048744Abstract: A LED driving circuit drives a plurality of LED (Light Emitting Diode) groups, has a common voltage that is changed according to an input voltage of the plurality of LED groups, and includes a common node, a plurality of phase switches arranged between the output terminals of the plurality of LED groups and the common node, and a plurality of phase switch control units that form current flows among a corresponding LED group, a corresponding phase switch, and the common node in phase sections of the input voltage based on the common voltage and a corresponding reference voltage, the input voltage having a time-variable phase. Accordingly, the LED driving circuit can correct a power factor without using an inductor or a capacitor.Type: ApplicationFiled: April 2, 2013Publication date: February 19, 2015Inventors: So Bong Shin, Yong Goo Kim, Ok Hwan Kwon, Won Ji Lee, Young Suk Son
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Publication number: 20140292217Abstract: A dimming system of a lamp using a light-emitting device includes: a power source including a power input terminal, a dimmer connected to the power input terminal, and a rectifier circuit; a lighting unit including light-emitting devices from a first light-emitting device to an nth light-emitting device; a light-emitting drive unit including a plurality of switching circuits individually connected to an output terminal of each of the light-emitting devices, and dimmer control circuits connected to the switching circuits of the first light-emitting device and configured to sense whether or not a current supply channel for the first light-emitting device is normally operated, and to output a control signal; and a dimmer drive unit parallel-connected to a connection line between the power source and a power input terminal of the first light-emitting device to form a bleeding current supply channel, and having a switch.Type: ApplicationFiled: March 7, 2014Publication date: October 2, 2014Inventors: So-Bong SHIN, Ok Hwan KWON
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Publication number: 20140111108Abstract: Embodiments of the present invention provide a light-emitting diode (LED) driver and method of controlling the static current of the LED driver. In some embodiments, the LED driver is configured to calculate output currents of a pulse form using a small number of parameters and adjust a gate control signal using the mean value of the output currents of a pulse form. Accordingly, the LED driver can be used to control a static current that flows through an LED array connected to a circuit on the secondary side of a transformer using a DC voltage or an AC voltage supplied to the primary side of the transformer. In some embodiments, the LED driver includes a power conversion unit, switching unit, transformer, zero current detection unit, and system control unit. In some embodiments, the system control unit is configured to adjust the gate control signal.Type: ApplicationFiled: September 17, 2013Publication date: April 24, 2014Applicant: SILICON WORKS CO., LTD.Inventors: Wanyuan QU, Ju Pyo HONG, Ok Hwan KWON, Chang Sik SHIN, Kyung Min KIM, Byeong Ho JEONG, Yong Goo KIM, Young Suk SON
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Patent number: 8686649Abstract: The present invention introduces a device and a method for driving an LED with an improved power factor without using a voltage detector having a large amount of area and power consumption. The device for driving an LED includes a power supply unit, an LED array, and a current path select circuit. The LED array 320 is connected with the power supply unit in parallel and includes at least one LED string including LED channels LED1 to LEDn that are configured of a plurality of LEDs connected in series. The current path select circuit selects a path of current flowing from output terminals of the plurality of LED channels according to voltage levels of each of the output terminals of the plurality of LED channels.Type: GrantFiled: October 26, 2012Date of Patent: April 1, 2014Assignee: Silicon Works Co., Ltd.Inventors: So Bong Shin, Wanyuan Qu, Won Ji Lee, Yong Goo Kim, Ok Hwan Kwon, Gyeong Sik Mun, Young Suk Son
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Publication number: 20140077715Abstract: Embodiments of the present invention provide a light-emitting diode (LED) driver for controlling a static current supplied to an LED array connected to a secondary coil of a transformer by using the peak values of currents flowing through a power transistor, which may reside in a switching element connected to a primary coil of the transformer. In some embodiments, the LED driver is configured to control the static current that flows through the LED array using an AC voltage supplied to the primary side of the transformer. In some embodiments, the LED driver includes a power conversion unit, a switching unit, a transformer, and a system control unit. In some embodiments, the method of controlling the static current of the LED driver includes a current peak value detection step, a step output current calculation step, a static current mean value calculation step, and a gate control signal update step.Type: ApplicationFiled: September 19, 2013Publication date: March 20, 2014Applicant: SILICON WORKS CO., LTD.Inventors: Ok Hwan KWON, Wanyuan QU, Ju Pyo HONG, Chang Sik SHIN, Kyung Min KIM, Byeong Ho JEONG, Yong Goo KIM, Young Suk SON
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Patent number: 8120602Abstract: The plasma display panel device according to the present invention includes a the data driver that includes a data IC applying a driving signal to at least one address electrode and a data driver applying a driving data signal to the data IC to reduce EMI and ensure timing margin according to high rate switching operations of the plural switches included in the data IC, wherein the data driver generates a first synchronization signal if N?1th data is different from Nth data and maintains and applies the first synchronization signal to the data IC if the Nth data is different from N+1th data.Type: GrantFiled: May 30, 2008Date of Patent: February 21, 2012Assignee: LG Electronics Inc.Inventors: Ok Hwan Kwon, Jong Ki Kim, Jun Bae Park
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Publication number: 20080297445Abstract: The plasma display panel device according to the present invention includes a the data driver that includes a data IC applying a driving signal to at least one address electrode and a data driver applying a driving data signal to the data IC to reduce EMI and ensure timing margin according to high rate switching operations of the plural switches included in the data IC, wherein the data driver generates a first synchronization signal if N?1th data is different from Nth data and maintains and applies the first synchronization signal to the data IC if the Nth data is different from N+1th data.Type: ApplicationFiled: May 30, 2008Publication date: December 4, 2008Inventors: Ok Hwan KWON, Jong Ki KIM, Jun Bae PARK