Patents by Inventor Yong Seong Roh
Yong Seong Roh 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: 11931798Abstract: Disclosure provides a two-segment electromagnet stirring member, and a two-segment electromagnet semi-solid die-casting apparatus including the same, and a die-casting method using the same. The two-segment electromagnet stirring member includes a plurality of magnetic field generation parts therein, and includes a first electromagnetic stirring part and a second electromagnetic stirring part separated from each other. The first electromagnetic stirring part and the second electromagnetic stirring part are coupled to each other in a ring shape to surround an outer circumferential surface of a sleeve to perform electromagnetic stirring to molten metal in the sleeve, and are coupled to each other so as to position the plurality of magnetic field generation parts at radially equal gaps around the sleeve.Type: GrantFiled: December 22, 2021Date of Patent: March 19, 2024Assignee: HANJOO LIGHT METAL CO., LTD.Inventors: Yong-Jin Lee, Jin-Ha Park, Myung-Seong Kong, Seong-Rak Park, Joong-Suk Roh
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Publication number: 20230361764Abstract: A power management integrated circuit including: a clock generator that generates an input clock; a first phase delay controller that delays the input clock by a first phase and outputs a first supply clock to a first switching converter; a second phase delay controller that delays the input clock by a second phase and outputs a second supply clock to a second switching converter; and a third phase delay controller that delays the input clock by a third phase and outputs a third supply clock to a third switching converter, wherein the first phase, the second phase and the third phase have different phases from each other.Type: ApplicationFiled: March 10, 2023Publication date: November 9, 2023Inventors: Hyun Seok NAM, Jin Gyu KANG, Jeong Woon KONG, Yong Seong ROH
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Patent number: 9437362Abstract: An apparatus and a method for wireless power reception are provided. A wireless power receiver includes a receiving unit configured to wirelessly receive a power. The wireless power receiver further includes a power consuming unit configured to consume the power, until a voltage applied to a load reaches a predetermined value, so that an amount of a power transferred from the receiving unit to the load is less than or equal to an initial accommodation power amount of the load.Type: GrantFiled: June 26, 2013Date of Patent: September 6, 2016Assignees: Samsung Electronics Co., Ltd., IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)Inventors: Dong Zo Kim, Sang Wook Kwon, Ki Young Kim, Nam Yun Kim, Seong Joong Kim, Yong Seong Roh, Young Jin Moon, Yun Kwon Park, Keum Su Song, Chang Sik Yoo, Chang Wook Yoon, Jin Sung Choi
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Patent number: 9431889Abstract: An active rectifier and a wireless power receiver including the active rectifier are provided. According to an aspect, an active rectifier may include: a first loop configured to provide voltage when the phase of an input signal is positive; and a second loop configured to provide voltage when the phase of the input signal is negative, wherein the first loop and the second loop include a delay locked loop configured to compensate for reverse current leakage due to a delay of a switch included therein.Type: GrantFiled: August 29, 2011Date of Patent: August 30, 2016Assignees: Samsung Electronics Co., Ltd., IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)Inventors: Dong Zo Kim, Young Tack Hong, Jin Sung Choi, Young Jin Moon, Sang Wook Kwon, Yun Kwon Park, Chang Sik Yoo, Eun Seok Park, Ki Young Kim, Young Ho Ryu, Nam Yun Kim, Yong Seong Roh
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Patent number: 9270165Abstract: There are provided a phase shift circuit and a power factor correction circuit including the same. The phase shift circuit includes a switching circuit unit charging power in or discharging power from a capacitor through a plurality of switching devices and comparing a voltage of the capacitor with a predetermined reference voltage, and a clock generating unit generating a reference clock signal based on an output of the switching circuit unit, wherein the switching circuit unit turns the plurality of switching devices on or off, based on currents from inductors respectively included in a main circuit and a sub-circuit of a power factor correction circuit to determine a polarity of the voltage of the capacitor.Type: GrantFiled: May 10, 2013Date of Patent: February 23, 2016Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., University of Seoul Industry Cooperation FoundationInventors: Yu Jin Jang, Hwan Cho, Yong Seong Roh, Young Jin Moon, Jeong Pyo Park, Joong Ho Choi, Jeong Mo Yang, Chang Sik Yoo
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Patent number: 9252655Abstract: A phase shift circuit may include a ramp generation unit charging or discharging a capacitor connected to a switch device to generate a ramp signal, a reference signal generation unit generating a predetermined reference signal from the ramp signal, and a comparison unit comparing the ramp signal with the reference signal to generate a clock signal, wherein at least one of the reference signal generation unit and the comparison unit changes a negative or positive value of offset components included in the reference signal or the ramp signal within every operating period of the switch device.Type: GrantFiled: April 11, 2013Date of Patent: February 2, 2016Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., UNIVERSITY OF SEOUL INDUSTRY COOPERATION FOUNDATIONInventors: Jeong Mo Yang, Hwan Cho, Yong Seong Roh, Young Jin Moon, Jeong Pyo Park, Chang Sik Yoo, Yu Jin Jang, Joong Ho Choi
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Patent number: 9225235Abstract: There is provided a power factor correction circuit including: a power conversion circuit unit controlling an inductor current according to a switching signal applied to a main switch to convert an external input voltage into an output voltage having a predetermined range; an imbalance detection circuit outputting an imbalance state signal when the external input voltage is in an unbalanced state by using the inductor current; and a soft start circuit unit performing soft starting by adjusting the switching signal when the imbalance state signal is output by the imbalance detection circuit unit.Type: GrantFiled: May 10, 2013Date of Patent: December 29, 2015Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., UNIVERSITY OF SEOUL INDUSTRY COOPERATION FOUNDATIONInventors: Yu Jin Jang, Hwan Cho, Yong Seong Roh, Young Jin Moon, Jeong Pyo Park, Chang Sik Yoo, Jeong Mo Yang, Joong Ho Choi
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Publication number: 20150102786Abstract: The present invention relates to a PFC control circuit, an active PFC circuit, and a PFC control method. According to an embodiment of the present invention, a PFC control circuit including: an inductor current sensing unit for sensing an inductor current of a PFC circuit; an output voltage feedback unit for outputting a feedback output signal; a sensing and feedback signal application unit for outputting a sensing voltage signal during switching duty on of the PFC circuit and adding the feedback output signal to the sensing voltage signal to output the added signal during switching duty off of the PFC circuit; and a PFC control unit for generating a comparison signal and generating a duty control signal from the comparison signal and a first reference signal to make variations due to an internal offset be removed or reduced is provided.Type: ApplicationFiled: October 15, 2014Publication date: April 16, 2015Applicants: Samsung Electro-Mechanics Co., Ltd., University of Seoul Industry Cooperation FoundationInventors: Byung Hoon KIM, Jeong Mo YANG, Hwan CHO, Yong Seong ROH, Young Jin MOON, Jeong Pyo PARK, Chang Sik YOO, Yu Jin JANG, Joong Ho CHOI
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Patent number: 8907719Abstract: The present invention relates to an IC circuit. In an embodiment, an IC circuit includes: an RT terminal connected to an external; a current mirroring unit conducting a channel current between internal voltage power and the RT terminal and generating an internal reference current mirrored with the channel current; a negative feedback unit receiving the internal reference current, equalizing voltages of an RT terminal connection terminal and an internal reference current output terminal of the current mirroring unit to make the internal reference current constant, and providing the internal reference current inside the IC circuit; and an IC state indicating unit having a transistor, which operates complementarily with the current mirroring unit, connected between the RT terminal and a ground and providing the state of an IC or a system to the RT terminal by being linked with the complementary operation of the current mirroring unit.Type: GrantFiled: November 15, 2012Date of Patent: December 9, 2014Assignees: Samsung Electro-Mechanics Co., Ltd., University of Seoul Industry Cooperation FoundationInventors: Joon Youp Sung, Jae Shin Lee, Joong Ho Choi, Yong Seong Roh, Ho Joon Jang, Chang Sik Yoo, Jung Sun Kwon, Young Jin Moon
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Patent number: 8791677Abstract: There is provided a power factor correction circuit capable of correcting a power factor of a power converting module through increasing an input current by switching a main switching element of a power converting module on the basis of a first reference wave having a slope based on a first signal and an error voltage, in particular, by limiting a switching frequency on the basis of a first reference wave having a slope based on a second signal lower than a first signal and an error voltage when the switching frequency of the main switching element increases because an input voltage of the power converting module is low.Type: GrantFiled: June 17, 2011Date of Patent: July 29, 2014Assignees: Samsung Electro-Mechanics Co., Ltd., University of Seoul Industry Cooperation FoundationInventors: Jeong Mo Yang, Chang Sik Yoo, Yung Jin Moon, Yong Seong Roh, Joong Ho Choi, Jae Shin Lee, Jung Chul Gong, Yu Jin Jang
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Publication number: 20140185339Abstract: There is provided a power factor correction circuit including: a power conversion circuit unit controlling an inductor current according to a switching signal applied to a main switch to convert an external input voltage into an output voltage having a predetermined range; an imbalance detection circuit outputting an imbalance state signal when the external input voltage is in an unbalanced state by using the inductor current; and a soft start circuit unit performing soft starting by adjusting the switching signal when the imbalance state signal is output by the imbalance detection circuit unit.Type: ApplicationFiled: May 10, 2013Publication date: July 3, 2014Applicants: University of Seoul Industry Cooperation Foundation, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Yu Jin JANG, Hwan CHO, Yong Seong ROH, Young Jin MOON, Jeong Pyo PARK, Chang Sik YOO, Jeong Mo YANG, Joong Ho CHOI
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Publication number: 20140177295Abstract: There are provided a phase shift circuit and a power factor correction circuit including the same. The phase shift circuit includes a switching circuit unit charging power in or discharging power from a capacitor through a plurality of switching devices and comparing a voltage of the capacitor with a predetermined reference voltage, and a clock generating unit generating a reference clock signal based on an output of the switching circuit unit, wherein the switching circuit unit turns the plurality of switching devices on or off, based on currents from inductors respectively included in a main circuit and a sub-circuit of a power factor correction circuit to determine a polarity of the voltage of the capacitor.Type: ApplicationFiled: May 10, 2013Publication date: June 26, 2014Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Yu Jin JANG, Hwan CHO, Yong Seong ROH, Young Jin MOON, Jeong Pyo PARK, Joong Ho CHOI, Jeong Mo YANG, Chang Sik YOO
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Publication number: 20140015331Abstract: An apparatus and a method for wireless power reception are provided. A wireless power receiver includes a receiving unit configured to wirelessly receive a power. The wireless power receiver further includes a power consuming unit configured to consume the power, until a voltage applied to a load reaches a predetermined value, so that an amount of a power transferred from the receiving unit to the load is less than or equal to an initial accommodation power amount of the load.Type: ApplicationFiled: June 26, 2013Publication date: January 16, 2014Inventors: Dong Zo KIM, Sang Wook KWON, Ki Young KIM, Nam Yun KIM, Seong Joong KIM, Yong Seong ROH, Young Jin MOON, Yun Kwon PARK, Keum Su SONG, Chang Sik YOO, Chang Wook YOON, Jin Sung CHOI
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Patent number: 8289091Abstract: A relaxation oscillator includes a ramp wave generator configured to generate a ramp wave by complementary first capacitor module charged and discharged according to a first switching signal and second capacitor module charged and discharged according to a second switching signal, a negative feedback circuit unit configured to generate a compensation voltage for compensating an error between the ramp wave and a reference voltage through a feedback of the ramp wave, and a switching signal generator configured to generate the first switching signal and the second switching signal from the compensation voltage and the ramp wave, including a peak voltage storage unit configured to store a peak voltage of the ramp wave that is controlled to be equal to the reference voltage based on the compensation voltage and a peak voltage transfer unit configured to transfer the peak voltage of the ramp wave to the negative feedback unit.Type: GrantFiled: January 12, 2011Date of Patent: October 16, 2012Assignees: Samsung Electro-Mechanics Co., Ltd., University of Seoul Industry Cooperation FoundationInventors: Jeong Mo Yang, Changsik Yoo, Young Jin Moon, Yong Seong Roh, Joong Ho Choi, Jae Shin Lee, Jung Chul Gong, Yu Jin Jang
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Publication number: 20120155133Abstract: Provided are a direct current/direct current (DC/DC) converter and a wireless power receiver including the DC/DC converter. In one embodiment, a direct current-direct current (DC/DC) converter for use in a wireless power receiver, the DC/DC converter may include: a voltage converting unit configured to convert, DC voltage, to a predetermined DC voltage; a turn-on switch configured to control current flow of the DC voltage through the voltage converting unit; and a switching controller configured to: detect an amount of current of the voltage converting unit based on a first turn-on period of the turn-on switch, set a second turn-on period of the turn-on switch based on the detected amount of current, and control the turn-on switch based on the second turn-on period.Type: ApplicationFiled: December 19, 2011Publication date: June 21, 2012Inventors: Dong Zo KIM, Young Tack HONG, Young Jin MOON, Sang Wook KWON, Yun Kwon PARK, Chang Sik YOO, Eun Seok PARK, Ki Young KIM, Young Ho RYU, Nam Yum KIM, Jin Sung CHOI, Yong Seong ROH
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Publication number: 20120087160Abstract: There is provided a power factor correction circuit capable of correcting a power factor of a power converting module through increasing an input current by switching a main switching element of a power converting module on the basis of a first reference wave having a slope based on a first signal and an error voltage, in particular, by limiting a switching frequency on the basis of a first reference wave having a slope based on a second signal lower than a first signal and an error voltage when the switching frequency of the main switching element increases because an input voltage of the power converting module is low.Type: ApplicationFiled: June 17, 2011Publication date: April 12, 2012Applicants: University of Seoul Industry Cooperation Foundation, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Jeong Mo YANG, Chang Sik YOO, Yung Jin MOON, Yong Seong ROH, Joong Ho CHOI, Jae Shin LEE, Jung Chul GONG, Yu Jin JANG
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Publication number: 20120086515Abstract: There is provided relaxation oscillator. The relaxation oscillator includes: a ramp wave generator generating ramp waves by a complementary operation between a first capacitor module charged and discharged according to a first switching signal and a second capacitor module charged and discharged according to a second switching signal; a negative feedback circuit unit generating a compensation voltage for compensating errors with reference voltage by being fedback with the ramp waves; and a switching signal generator generating the first switching signal controlling the charging and discharging of the first capacitor module and the second switching signal controlling the charging and discharging of the second capacitor module from the compensation voltage and the ramp waves. As a result, the present invention can generate ramp waves having a stable frequency while preventing a frequency from being changed due to a delay or an offset of the comparator.Type: ApplicationFiled: January 12, 2011Publication date: April 12, 2012Applicants: University of Seoul Industry Cooperation Foundation, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Jeong Mo YANG, Changsik YOO, Young-Jin MOON, Yong-Seong ROH, Joong Ho CHOI, Jae Shin LEE, Jung Chul GONG, Yu Jin JANG
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Publication number: 20120051109Abstract: An active rectifier and a wireless power receiver including the active rectifier are provided. According to an aspect, an active rectifier may include: a first loop configured to provide voltage when the phase of an input signal is positive; and a second loop configured to provide voltage when the phase of the input signal is negative, wherein the first loop and the second loop include a delay locked loop configured to compensate for reverse current leakage due to a delay of a switch included therein.Type: ApplicationFiled: August 29, 2011Publication date: March 1, 2012Inventors: Dong Zo KIM, Young Tack Hong, Jin Sung Choi, Young Jin Moon, Sang Wook Kwon, Yun Kwon Park, Chang Sik Yoo, Eun Seok Park, Ki Young Kim, Young Ho Ryu, Nam Yun Kim, Yong Seong Roh