Patents by Inventor Chang-sik Yoo

Chang-sik Yoo 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: 20180123450
    Abstract: A switching regulator includes an inductor connected to an output terminal of the switching regulator, a switching circuit configured to supply a current from an input terminal of the switching regulator to the inductor in response to an activated control signal, and an RC circuit including a sense resistor and a sense capacitor and connected to the inductor in parallel, the sense resistor and the sense capacitor being connected to each other in series at a feedback node.
    Type: Application
    Filed: April 20, 2017
    Publication date: May 3, 2018
    Applicants: SAMSUNG ELECTRONICS CO., LTD., INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
    Inventors: YOUNG-JIN MOON, CHANG-SIK YOO, MIN-GYU JEONG, KOOK-DONG KIM
  • Publication number: 20180006488
    Abstract: An apparatus and a method for charge control are provided. The apparatus for charge control may include an integrated direct current-to-direct current (DC/DC) converter configured to step up an output voltage level of a load to be greater than or equal to a supply voltage level set in a power amplifier, and the power amplifier configured to convert a direct current (DC) voltage stepped up by the integrated DC/DC converter into an alternating current (AC) voltage based on a resonant frequency, and to amplify the converted AC voltage. The apparatus for charge control may include a rectification unit configured to convert an AC power received wirelessly into a DC power; and a DC/DC converter configured to step down a voltage level of the DC power to a voltage level required by a load in the receiving mode.
    Type: Application
    Filed: September 19, 2017
    Publication date: January 4, 2018
    Applicants: 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, Young Jin MOON, Yun Kwon PARK, Keum Su SONG, Chi Hyung AHN, Young Ho RYU, Chang Sik YOO, Chang Wook YOON, Jin Sung CHOI
  • Patent number: 9793740
    Abstract: An apparatus and a method for charge control are provided. The apparatus for charge control may include an integrated direct current-to-direct current (DC/DC) converter configured to step up an output voltage level of a load to be greater than or equal to a supply voltage level set in a power amplifier, and the power amplifier configured to convert a direct current (DC) voltage stepped up by the integrated DC/DC converter into an alternating current (AC) voltage based on a resonant frequency, and to amplify the converted AC voltage. The apparatus for charge control may include a rectification unit configured to convert an AC power received wirelessly into a DC power; and a DC/DC converter configured to step down a voltage level of the DC power to a voltage level required by a load in the receiving mode.
    Type: Grant
    Filed: November 25, 2013
    Date of Patent: October 17, 2017
    Assignees: 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, Young Jin Moon, Yun Kwon Park, Keum Su Song, Chi Hyung Ahn, Young Ho Ryu, Chang Sik Yoo, Chang Wook Yoon, Jin Sung Choi
  • Publication number: 20170277387
    Abstract: A method of adjusting the size, position, or arrangement of a UI and a user terminal using the method are disclosed. The user terminal includes a display unit for displaying a UI, and a UI control unit configured to display the UI on the display unit with at least one of a position, size, and arrangement of the UI adjusted according to an input by a user.
    Type: Application
    Filed: May 19, 2017
    Publication date: September 28, 2017
    Inventor: Chang-Sik YOO
  • Patent number: 9712077
    Abstract: A method of compensating for reverse current leakage in an active rectifier may include advancing an output of a comparator by a predetermined period of time by applying a predetermined offset voltage to a reference voltage input to the comparator, and activating a switch based on the output of the comparator. The method may also include deactivating the switch when a predetermined time delay elapses from a point in time at which the switch was activated.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: July 18, 2017
    Assignees: Samsung Electronics Co., Ltd., Industry-University Cooperation Foundation Hanyang University
    Inventors: Dong Zo Kim, Sang Wook Kwon, Ki Young Kim, Bong Chul Kim, Young Jin Moon, Jae Hyun Park, Chang Sik Yoo, Byoung Hee Lee
  • Patent number: 9703470
    Abstract: A method of adjusting the size, position, or arrangement of a UI and a user terminal using the method are disclosed. The user terminal includes a display unit for displaying a UI, and a UI control unit configured to display the UI on the display unit with at least one of a position, size, and arrangement of the UI adjusted according to an input by a user.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: July 11, 2017
    Assignee: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
    Inventor: Chang-Sik Yoo
  • Patent number: 9437362
    Abstract: 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: Grant
    Filed: June 26, 2013
    Date of Patent: September 6, 2016
    Assignees: 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
  • Patent number: 9431889
    Abstract: 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: Grant
    Filed: August 29, 2011
    Date of Patent: August 30, 2016
    Assignees: 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
  • Publication number: 20160170703
    Abstract: A system for linking and controlling terminals is disclosed. The user terminal includes a decoding unit configured to decode image data received from a receiving terminal; a touch display unit configured to display the decoded image; and an information transmitting unit configured to transmit selection information for an event-executing entity included in the decoded image to the receiving terminal.
    Type: Application
    Filed: February 24, 2016
    Publication date: June 16, 2016
    Inventor: Chang-sik YOO
  • Patent number: 9337849
    Abstract: A phase detector includes a phase comparing circuit configured to detect and output a phase difference between a first clock signal and a second clock signal, a latch circuit configured to latch an output signal of the phase comparing circuit and output a phase detection signal, and an initial voltage control circuit configured to control an initial voltage of an input terminal of the latch circuit according to a control signal.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: May 10, 2016
    Assignees: SK HYNIX INC., INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
    Inventors: Young-Hoon Kim, Soo-Young Jang, Chang-Sik Yoo, Chun-Seok Jeong, Kang-Seol Lee
  • Patent number: 9270165
    Abstract: 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: Grant
    Filed: May 10, 2013
    Date of Patent: February 23, 2016
    Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., University of Seoul Industry Cooperation Foundation
    Inventors: Yu Jin Jang, Hwan Cho, Yong Seong Roh, Young Jin Moon, Jeong Pyo Park, Joong Ho Choi, Jeong Mo Yang, Chang Sik Yoo
  • Patent number: 9252655
    Abstract: 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: Grant
    Filed: April 11, 2013
    Date of Patent: February 2, 2016
    Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., UNIVERSITY OF SEOUL INDUSTRY COOPERATION FOUNDATION
    Inventors: Jeong Mo Yang, Hwan Cho, Yong Seong Roh, Young Jin Moon, Jeong Pyo Park, Chang Sik Yoo, Yu Jin Jang, Joong Ho Choi
  • Patent number: 9225235
    Abstract: 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: Grant
    Filed: May 10, 2013
    Date of Patent: December 29, 2015
    Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., UNIVERSITY OF SEOUL INDUSTRY COOPERATION FOUNDATION
    Inventors: Yu Jin Jang, Hwan Cho, Yong Seong Roh, Young Jin Moon, Jeong Pyo Park, Chang Sik Yoo, Jeong Mo Yang, Joong Ho Choi
  • Publication number: 20150293659
    Abstract: A method of adjusting the size, position, or arrangement of a UI and a user terminal using the method are disclosed. The user terminal includes a display unit for displaying a UI, and a UI control unit configured to display the UI on the display unit with at least one of a position, size, and arrangement of the UI adjusted according to an input by a user.
    Type: Application
    Filed: June 11, 2013
    Publication date: October 15, 2015
    Applicant: Industry-University Cooperation Foundation Hanyang University
    Inventor: Chang-Sik Yoo
  • Publication number: 20150146466
    Abstract: A method of compensating for reverse current leakage in an active rectifier may include advancing an output of a comparator by a predetermined period of time by applying a predetermined offset voltage to a reference voltage input to the comparator, and activating a switch based on the output of the comparator. The method may also include deactivating the switch when a predetermined time delay elapses from a point in time at which the switch was activated.
    Type: Application
    Filed: July 9, 2014
    Publication date: May 28, 2015
    Applicants: Samsung Electronics Co., Ltd., Industry-University Cooperation Foundation Hanyang University
    Inventors: Dong Zo Kim, Sang Wook Kwon, Ki Young Kim, Bong Chul Kim, Young Jin Moon, Jae Hyun Park, Chang Sik Yoo, Byoung Hee Lee
  • Publication number: 20150102786
    Abstract: 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: Application
    Filed: October 15, 2014
    Publication date: April 16, 2015
    Applicants: Samsung Electro-Mechanics Co., Ltd., University of Seoul Industry Cooperation Foundation
    Inventors: 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
  • Patent number: 8941411
    Abstract: A signal transmission circ it includes a main driving unit configured to drive a first signal transmission One in response to an input signal and output a first driven signal, an emphasis driving unit configured to perform an emphasis operation on the first driven signal and output an emphasized signal, and a crosstalk control unit configured to perform an equalizing operation on the emphasized signal.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 27, 2015
    Assignees: SK Hynix Inc., Industry-University Cooperation Foundation Hanyang University
    Inventors: Chun-Seok Jeong, Young-Hoon Kim, Chang-Sik Yoo
  • Publication number: 20150008961
    Abstract: A phase detector includes a phase comparing circuit configured to detect and output a phase difference between a first clock signal and a second clock signal, a latch circuit configured to latch an output signal of the phase comparing circuit and output a phase detection signal, and an initial voltage control circuit configured to control an initial voltage of an input terminal of the latch circuit according to a control signal.
    Type: Application
    Filed: July 7, 2014
    Publication date: January 8, 2015
    Inventors: Young-Hoon KIM, Soo-Young JANG, Chang-Sik YOO, Chun-Seok JEONG, Kang-Seol LEE
  • Patent number: 8913026
    Abstract: A system for linking and controlling terminals includes a user terminal that includes an image unit configured to output image data to be shared with a receiving terminal larger than the user terminal, and a signal unit configured to transmit an image signal and a control signal to the receiving terminal, the image signal having the image data outputted from the image unit, and the control signal including position information of a touch means near the user terminal. An image representing the position information of the touch means is displayed on the receiving terminal to enable a control of the user terminal by way of the receiving terminal viewed by a user of the user terminal.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: December 16, 2014
    Assignee: Industry-University Cooperation Foundation Hanyang University
    Inventor: Chang-sik Yoo
  • Patent number: 8907719
    Abstract: 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: Grant
    Filed: November 15, 2012
    Date of Patent: December 9, 2014
    Assignees: Samsung Electro-Mechanics Co., Ltd., University of Seoul Industry Cooperation Foundation
    Inventors: Joon Youp Sung, Jae Shin Lee, Joong Ho Choi, Yong Seong Roh, Ho Joon Jang, Chang Sik Yoo, Jung Sun Kwon, Young Jin Moon