Patents by Inventor Sang Kyoo Han

Sang Kyoo Han 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: 20140184093
    Abstract: There is provided a single stage forward-flyback converter including a power converting unit switching input power to perform a forward power conversion operation while being switched on and perform a flyback power conversion operation while being switched off, a path providing unit clamping power formed by the forward power conversion operation of the power converting unit and power formed by the flyback power conversion operation thereof to provide power transfer paths, and a controlling unit controlling the power conversion operation of the power converting unit according to a voltage level of the input power.
    Type: Application
    Filed: June 27, 2013
    Publication date: July 3, 2014
    Inventors: Sang Kyoo HAN, Byoung Woo RYU, Heung Gyoon CHOI, Keun Wook LEE, Hong Sun PARK
  • Publication number: 20140159696
    Abstract: There is provided a universal power supply apparatus including a power supply unit switching input power into driving power having a preset voltage level and supplying the driving power, a power recognition unit outputting a recognition voltage having a preset voltage level to an output terminal from which the power is output to recognize connection of a device, controlling a power output of the power supply unit according to a detected rated output, and recognizing disconnection of the device after the connection of the device according to a power state of the driving power of the power supply unit, and a detection unit providing a detection voltage having a preset voltage level to the output terminal.
    Type: Application
    Filed: March 15, 2013
    Publication date: June 12, 2014
    Applicants: Kookmn University Industry Academy Cooperation Foundation, SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: SANG KYOO HAN, Moon Hwan KEUM, Young Seung NOH, Bo Mi LEE
  • Publication number: 20140111175
    Abstract: There are provided a universal power supplying apparatus and a universal power supplying method that can be universally used for various types of devices having a variety of voltage and current levels of a driving power. The universal power supplying apparatus includes a power supplying unit that converts an input power into a driving power having a previously set voltage level and supplies the converted power, a power recognizing unit that outputs a recognized voltage having the previously set voltage level to an output terminal from which power is output to recognize connection of a device, and controls a power output of the power supplying unit according to a detected rated output, and a detecting unit that provides a detection voltage having the previously set voltage level to the output terminal.
    Type: Application
    Filed: February 28, 2013
    Publication date: April 24, 2014
    Applicants: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION, SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Young Seung NOH, Sang Kyoo HAN, Moon Hwan KEUM, Bo Mi LEE
  • Publication number: 20140035485
    Abstract: There is provided a single-stage forward-flyback converter capable of increasing power factor and power conversion efficiency while performing power factor correction and constant current control in a single-stage circuit. The converter includes: a power converting unit including a transformer having a primary winding receiving input power and a secondary winding magnetically coupled to the primary winding to receive power induced thereto, and converting the input power in a forward scheme and a flyback scheme; a balancing unit maintaining balance between a power level by the forward scheme of the power converting unit and a power level by the flyback scheme thereof; and a path providing unit clamping the power by the forward scheme of the power converting unit and the power by the flyback scheme thereof to provide a power transfer path, wherein the power converting unit selectively operates the forward scheme according to a voltage level of input power.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 6, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Kyoo HAN, Min Ha HWANG, Yoon CHOI, Hong Sun PARK, Byoung Woo RYU, Sung Cheol KIM, Dong Seong OH
  • Publication number: 20140035477
    Abstract: There are provided a single stage forward-flyback converter, and a power supply apparatus capable of increasing power factor correction and power conversion efficiency. The single stage forward-flyback converter includes: a forward converter unit including a transformer having a primary winding receiving input power and a first secondary winding magnetically coupled to the primary winding to receive power induced thereto, and converting the power in a forward scheme; and a flyback converter unit sharing the transformer, including a second secondary winding, and converting the power in a flyback scheme, wherein the forward converter unit is selectively operated according to a voltage level of the input power.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 6, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Kyoo HAN, Yoon CHOI, Min Ha HWANG, Hong Sun PARK, Byoung Woo RYU, Sung Cheol KIM, Dong Seong OH
  • Patent number: 8508144
    Abstract: The power supply includes: an electromagnetic interference filter including a first filter which has a pair of electromagnetically coupled cores having at least two leg parts, first and second bobbins each having a tube-shaped body part having a penetration hole into which each of the leg parts is inserted and having a winding region defined as the circumference of the outer peripheral surface of the body part, and first and second coils respectively wound around the first and second bobbins to remove common mode electromagnetic interference included in power transmitted from a power line, the electromagnetic interference filter removing differential mode electromagnetic interference due to leakage inductance formed due to the leakage of magnetic flux flowing through the cores; a power factor corrector correcting a power factor of the power where the electromagnetic interference is removed; and a power converter switching the power-factor-corrected power into a driving power having a predetermined voltage lev
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: August 13, 2013
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Sang Kyoo Han, Sung Soo Hong, Mi Ran Baek, Chung Wook Roh, Hee Seung Kim, Jae Sun Won, Ku Yong Kim, Jae Cheol Ju, Don Sik Kim, Dong Jin Lee
  • Patent number: 8446103
    Abstract: There is provided a lamp driver including: a power supplying part switching an input power, supplying a driving power to at least one lamp, and controlling brightness of the at least one lamp according to a dimming signal; a signal supplying part supplying a first comparison result signal obtained by comparing a current sensing signal sensing a current flowing through the at least one lamp with a reference signal having a current level set beforehand when the dimming signal is a logic high signal, and supplying a second comparison result signal having a voltage level set beforehand when the dimming signal is a logic low signal; and a controlling part controlling the switching of the power supplying part according to a signal being supplied by the signal supplying part.
    Type: Grant
    Filed: September 21, 2010
    Date of Patent: May 21, 2013
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Sang Kyoo Han, Sung Soo Hong, Chung Wook Roh, Sang Gab Park, Young Seung Roh, Hyo Joong An, Heung Gyoon Choi, Han Hee Lee
  • Patent number: 8373354
    Abstract: There is provided a backlight unit driver capable of driving multi-channel lamps of a backlight unit, especially LED lamps, by supplying a driving power to the lamps using a single transformer and maintaining the current balance of the driving power supplied to each of the lamps.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: February 12, 2013
    Assignee: Samsung Electro-Mechanics, Co., Ltd.
    Inventors: Sang Kyoo Han, Sung Soo Hong, Chung Wook Roh, Sang Gab Park, Kyu Min Park, Young Seung Roh, Heung Gyoon Choi, Nam Jin Park
  • Patent number: 8305058
    Abstract: The present invention relates to power supplies, and more particularly, to a power supply having a maximum power point tracking function that can reduce manufacturing costs and circuit size by using a maximum power point tracking section with a simplified circuit in a solar photovoltaic power generator supplying power using sunlight instead of using a micro controller, the maximum power point tracking section that controls power switching according to a result of integration of a value obtained by dividing a power variation by a voltage variation to track a maximum power value.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: November 6, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jin Wook Kim, Sung Soo Hong, Sang Kyoo Han, Chung Wook Roh, Jong Sun Kim, Sang Hun Lee, Jae Sun Won, Dong Seong Oh, Jong Hae Kim
  • Patent number: 8274805
    Abstract: There is provided a high voltage power supply capable of reducing voltage stress of a voltage multiplying device. The high voltage power supply includes: a power converter switching on/off and converting an input direct current power into a direct current power having a preset voltage level; and a voltage multiplier including a first multiplying cell multiplying the voltage level of the direct current power from the power converter, wherein the first multiplying cell includes: first and second capacitors charging the direct current power from the power converter, respectively; a first diode providing a path for transferring the direct current power when the power converter is switched off; and a second diode providing a path for transferring the direct current power when the power converter is switched on.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: September 25, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jin Wook Kim, Sug Chin Sakong, Sung Soo Hong, Sang Kyoo Han, Chung Wook Roh, Jong Sun Kim, Dong Seong Oh, Jae Sun Won, Jong Hae Kim
  • Publication number: 20120223797
    Abstract: Provided is a choke coil including: a first primary winding portion formed by winding a primary coil by n turns; a second primary winding portion formed by winding the primary coil by N turns; a first secondary winding portion formed by winding a secondary coil by N turns; and a second secondary winding portion formed by winding the secondary coil by n turns, wherein the n and N satisfy the condition: n?N.
    Type: Application
    Filed: February 29, 2012
    Publication date: September 6, 2012
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Jae Sun WON, Sang Kyoo HAN, Mi Ran BAEK, Hee Seung KIM, Jae Cheol JU, Don Sik KIM, Jong Hae KIM, Dong Jin LEE, Chung Wook RHO, Sung Soo HONG
  • Publication number: 20120176102
    Abstract: A power control method for tracking a Maximum Power Point (MPP) in a photovoltaic system including a solar cell and a boost converter. The power control method includes finding the MPP by applying a continuous ON/OFF signal to the boost converter as a first control signal for controlling a duty ratio of the boost converter, and maintaining an operating point of the photovoltaic system at the MPP by applying a second control signal for controlling the duty ratio to the boost converter depending on a constant-voltage command. In tracking an MPP in a photovoltaic system, an MPPT algorithm may remain at the MPP, without self oscillation, improving fast dynamic characteristics upon a change in solar radiation.
    Type: Application
    Filed: July 8, 2011
    Publication date: July 12, 2012
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Yong-Woo KIM, Sang-Keun Jl, Sung-Soo Hong, Chung-Wook Roh, Sang-Kyoo Han
  • Publication number: 20120153857
    Abstract: The power supply includes: an electromagnetic interference filter including a first filter which has a pair of electromagnetically coupled cores having at least two leg parts, first and second bobbins each having a tube-shaped body part having a penetration hole into which each of the leg parts is inserted and having a winding region defined as the circumference of the outer peripheral surface of the body part, and first and second coils respectively wound around the first and second bobbins to remove common mode electromagnetic interference included in power transmitted from a power line, the electromagnetic interference filter removing differential mode electromagnetic interference due to leakage inductance formed due to the leakage of magnetic flux flowing through the cores; a power factor corrector correcting a power factor of the power where the electromagnetic interference is removed; and a power converter switching the power-factor-corrected power into a driving power having a predetermined voltage lev
    Type: Application
    Filed: April 26, 2011
    Publication date: June 21, 2012
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Kyoo HAN, Sung Soo HONG, Mi Ran BAEK, Chung Wook ROH, Hee Seung KIM, Jae Sun WON, Ku Yong KIM, Jae Cheol JU, Don Sik KIM, Dong Jin LEE
  • Patent number: 8120278
    Abstract: The present invention provides an LED driving circuit including: an inverter unit for switching an input power source; a plurality of transformers including a plurality of primary windings connected to the inverter unit and connected to each other in series and a plurality of secondary windings each of which is coupled with each of the primary windings; a plurality of rectification units each of which is connected to each of the secondary windings; and a plurality of LEDs each of which is connected to each of the rectification units.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: February 21, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Heung Gyoon Choi, Sung Soo Hong, Sang Kyoo Han, Chung Wook Roh, Sang Ho Cho, Sang Hyun Lee, Sung Ho Kim, Tae Hyung Kang, Jae Sun Won
  • Patent number: 8107262
    Abstract: There is provided a variable switching frequency type power supply that can achieve high efficiency by fixing a switching duty cycle to 50% and varying switching frequency. A variable switching frequency type power supply according to an aspect of the invention may include: a switching unit switching input power; a transformation unit converting a voltage level of the power switched by the switching unit into a predetermined voltage level; a rectification unit rectifying the power converted by the transformation unit; and a control unit fixing a switching duty cycle of the switching unit to a predetermined switching duty cycle, and varying switching frequency of the switching unit according to a voltage level of output power.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: January 31, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jae Sun Won, Sung Soo Hong, Chung Wook Roh, Sang Kyoo Han, Jong Sun Kim, Dong Seong Oh, Tae Won Heo, Dong Joong Kim, Don Sik Kim, Hak Ryong Kim
  • Publication number: 20110234111
    Abstract: There is provided a lamp driver including: a power supplying part switching an input power, supplying a driving power to at least one lamp, and controlling brightness of the at least one lamp according to a dimming signal; a signal supplying part supplying a first comparison result signal obtained by comparing a current sensing signal sensing a current flowing through the at least one lamp with a reference signal having a current level set beforehand when the dimming signal is a logic high signal, and supplying a second comparison result signal having a voltage level set beforehand when the dimming signal is a logic low signal; and a controlling part controlling the switching of the power supplying part according to a signal being supplied by the signal supplying part.
    Type: Application
    Filed: September 21, 2010
    Publication date: September 29, 2011
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Kyoo Han, Sung Soo Hong, Chung Wook Roh, Sang Gab Park, Young Seung Roh, Hyo Joong An, Heung Gyoon Choi, Han Hee Lee
  • Publication number: 20110222849
    Abstract: Disclosed herein is an optical transmission apparatus for visible light communication. The optical transmission apparatus includes a power conversion unit, a drive unit, an encoding unit, a control unit, and a detection unit. The power conversion unit provides Direct Current (DC) power to the lighting LED lamps. The drive unit is operated using a switching drive method and supplies operating current to the lighting LED lamps. The encoding unit is connected to an external network, receives and encodes data, and provides it to the drive unit. The control unit controls the operation of the power conversion unit, the drive unit, and the encoding unit. The detection unit measures the strength of a visible light signal sent by the lighting LED lamps.
    Type: Application
    Filed: January 11, 2011
    Publication date: September 15, 2011
    Applicant: KOOKMIN UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: Sang-Kyoo HAN, Sung-Soo Hong, Byung-Jun Jang, Chung-Wook Roh
  • Publication number: 20110204804
    Abstract: There is provided a backlight unit driver capable of driving multi-channel lamps of a backlight unit, especially LED lamps, by supplying a driving power to the lamps using a single transformer and maintaining the current balance of the driving power supplied to each of the lamps.
    Type: Application
    Filed: February 7, 2011
    Publication date: August 25, 2011
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Kyoo HAN, Sung Soo HONG, Chung Wook ROH, Sang Gab PARK, Kyu Min PARK, Young Seung ROH, Heung Gyoon CHOI, Nam Jin PARK
  • Patent number: 7940032
    Abstract: A power supply having a maximum power point tracking function that controls power switching so that a detected power value is within a reference range having a maximum power point in a predetermined current-voltage curve includes: a converter section switching input power and converting the switched input power into predetermined DC power; and a maximum power point tracking section detecting a power value determined according to a switching operation of the converter section among power values included in a predetermined power-voltage curve, and controlling the switching operation of the converter section so that the detected power value is located within a predetermined reference range having a maximum power value among the power values included in the power-voltage curve.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: May 10, 2011
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jin Wook Kim, Sung Soo Hong, Chung Wook Roh, Sang Kyoo Han, Jong Sun Kim, Jae Sun Won, Dong Seong Oh, Dea Min Jang, Jong Hae Kim
  • Patent number: 7915757
    Abstract: Disclosed is a multi-output DC/DC converter controlling power-conversion switching in synchronization with a frequency of one output voltage among multiple output voltages in an LLC resonant DC/DC converter. The multi-output DC/DC converter includes a power conversion circuit performing alternate switching on an input DC voltage to output multiple DC voltages including a first DC voltage and a second DC voltage each having a preset voltage level, and a control circuit controlling the alternate switching of the power conversion circuit in synchronization with a preset resonant frequency.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: March 29, 2011
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jong Hae Kim, Sug Chin Sakong, Sung Soo Hong, Chung Wook Roh, Sang Kyoo Han, Jong Sun Kim, Dong Seong Oh