Patents by Inventor Byoung Woo Ryu

Byoung Woo Ryu 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: 20160056725
    Abstract: A feedback signal generating circuit may include a control voltage adjusting circuit outputting a feedback voltage by comparing a control voltage input from an external voltage source with a reference voltage and adjusting a ratio of control voltage drop, and an amplifying circuit generating a feedback signal by differentially amplifying the feedback voltage and a detection voltage associated with a current flowing in a load.
    Type: Application
    Filed: February 9, 2015
    Publication date: February 25, 2016
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Ki Hong Kim, Byoung Woo Ryu, Jung Woo Choi
  • Patent number: 9232577
    Abstract: A method of controlling a power driver for LED illumination may include receiving, by a power correction unit, an AC voltage from the outside, rectifying the received AC voltage into a DC voltage, and correcting a power factor of the rectified DC voltage; and receiving, by a DC/DC converter unit, the DC voltage from the power factor correction unit and converting the received DC voltage into a DC voltage which has a magnitude different from the received DC voltage and is supplied to an LED module. A skip control unit, which is disposed in the DC/DC converter unit, may be fed back with a current flowing in the LED module driven by receiving the output from the DC/DC converter unit to detect a magnitude of the current and output a signal for a skip mode control depending on the detected magnitude of the current.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: January 5, 2016
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Byoung Woo Ryu, Jung Woo Choi, Ki Hong Kim
  • Patent number: 9231485
    Abstract: A power supply may include a driving power supply unit converting input power to supply driving power to a load, and a power supply control unit performing a control to detect a change in a voltage level of the driving power and cut off the input power when the detected voltage level of the driving power is equal to or more than a preset voltage level, in a preset standby mode.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: January 5, 2016
    Assignee: Samsung Electro-Mechanics Co., Ltd
    Inventors: Byoung Woo Ryu, Tae Seok Ko
  • Publication number: 20150334802
    Abstract: A device for driving a light emitting diode (LED) module is disclosed, wherein alternating current (AC) power is rectified and applied to an LED module and brightness of the LED module is adjusted by adjusting the maximum value of an LED current passing through the LED module, thereby achieving natural brightness adjustment. The device for driving an LED module may include a driver, a control signal receiver, a control signal converter, and a linear circuit.
    Type: Application
    Filed: May 13, 2015
    Publication date: November 19, 2015
    Applicant: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Byoung Woo RYU
  • Patent number: 9192010
    Abstract: There are provided a dimming control apparatus, a lighting system driving apparatus, and a dimming control method, the dimming control apparatus including a voltage converting unit converting a dimming signal from a dimmer into dimming voltage, an analog-to-digital (A/D) converting unit converting the dimming voltage into a digital dimming value, a dimming setting unit determining whether or not the digital dimming value is included in a preset dimming value range, and when the digital dimming value is not included in the preset dimming value range, resetting the dimming value range so as to allow the digital dimming value to be included in the reset dimming value range, a memory unit storing a dimming control value corresponding to the digital dimming value, and a dimming control unit generating a dimming control signal based on the dimming control value corresponding to the digital dimming value from the A/D converting unit.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: November 17, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Kyu Tae Seo, Ki Hong Kim, Dae Hoon Choi, Min Jin Kim, Heung Gyoon Choi, Byoung Woo Ryu
  • Patent number: 9148928
    Abstract: There is provided a light emitting diode driver capable of improving power efficiency by using a resistor having a low power consumption rating while controlling an LED channel so that it has constant brightness stably. The light emitting diode driver includes: a power supplying unit converting an input voltage into a predetermined driving voltage so as to supply the driving voltage to an LED channel; and a driving unit amplifying a detection voltage detected based on a current from the LED channel by a predetermined gain and controlling the current flowing through the LED channel so that the amplified detection voltage has a level equal to that of a predetermined reference voltage.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: September 29, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Jung Eui Park, Jin Soo Lee, Byoung Woo Ryu, Seung Kon Kong, Dae Hoon Han, Bo Hyun Hwang
  • Publication number: 20150207421
    Abstract: A power supply may include a driving power supply unit converting input power to supply driving power to a load, and a power supply control unit performing a control to detect a change in a voltage level of the driving power and cut off the input power when the detected voltage level of the driving power is equal to or more than a preset voltage level, in a preset standby mode.
    Type: Application
    Filed: December 24, 2014
    Publication date: July 23, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Byoung Woo RYU, Tae Seok Ko
  • Publication number: 20150189707
    Abstract: A method of controlling a power driver for LED illumination may include receiving, by a power correction unit, an AC voltage from the outside, rectifying the received AC voltage into a DC voltage, and correcting a power factor of the rectified DC voltage; and receiving, by a DC/DC converter unit, the DC voltage from the power factor correction unit and converting the received DC voltage into a DC voltage which has a magnitude different from the received DC voltage and is supplied to an LED module. A skip control unit, which is disposed in the DC/DC converter unit, may be fed back with a current flowing in the LED module driven by receiving the output from the DC/DC converter unit to detect a magnitude of the current and output a signal for a skip mode control depending on the detected magnitude of the current.
    Type: Application
    Filed: December 30, 2014
    Publication date: July 2, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Byoung Woo RYU, Jung Woo Choi, Ki Hong Kim
  • Publication number: 20150115840
    Abstract: There is provided a light emitting diode driver capable of improving power efficiency by using a resistor having a low power consumption rating while controlling an LED channel so that it has constant brightness stably. The light emitting diode driver includes: a power supplying unit converting an input voltage into a predetermined driving voltage so as to supply the driving voltage to an LED channel; and a driving unit amplifying a detection voltage detected based on a current from the LED channel by a predetermined gain and controlling the current flowing through the LED channel so that the amplified detection voltage has a level equal to that of a predetermined reference voltage.
    Type: Application
    Filed: January 24, 2014
    Publication date: April 30, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Jung Eui PARK, Jin Soo Lee, Byoung Woo Ryu, Seung Kon Kong, Dae Hoon Han, Bo Hyun Hwang
  • Publication number: 20150115824
    Abstract: A light emitting diode driver includes a power supplying unit receiving an alternating current (AC) power and outputting a transformed power according to a predetermined ratio, a rectifying unit rectifying the output power from the power supplying unit, and a double voltage unit receiving the rectified power from the rectifying unit and generating an output voltage such that the level of the output voltage is variable, and has constant duty and frequency thereof even the variance of the voltage level.
    Type: Application
    Filed: October 14, 2014
    Publication date: April 30, 2015
    Inventors: Keun Wook LEE, Byoung Woo RYU
  • 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: 20140176111
    Abstract: There is provided a voltage control circuit that is applicable to a LED device, a power supply or the like. The voltage control circuit includes: a voltage dividing unit dividing a supply voltage into a first voltage and a second voltage different from each other; a shunt regulator adjusting the first voltage according to the second voltage; and an output circuit unit outputting the voltage regulated by the shunt regulator.
    Type: Application
    Filed: December 11, 2013
    Publication date: June 26, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Ki Hong KIM, Min Jin KIM, Byoung Woo RYU, Heung Gyoon CHOI
  • Publication number: 20140176001
    Abstract: There are provided a dimming control apparatus, a lighting system driving apparatus, and a dimming control method, the dimming control apparatus including a voltage converting unit converting a dimming signal from a dimmer into dimming voltage, an analog-to-digital (A/D) converting unit converting the dimming voltage into a digital dimming value, a dimming setting unit determining whether or not the digital dimming value is included in a preset dimming value range, and when the digital dimming value is not included in the preset dimming value range, resetting the dimming value range so as to allow the digital dimming value to be included in the reset dimming value range, a memory unit storing a dimming control value corresponding to the digital dimming value, and a dimming control unit generating a dimming control signal based on the dimming control value corresponding to the digital dimming value from the A/D converting unit.
    Type: Application
    Filed: July 30, 2013
    Publication date: June 26, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Kyu Tae SEO, Ki Hong KIM, Dae Hoon CHOI, Min Jin KIM, Heung Gyoon CHOI, Byoung Woo RYU
  • Publication number: 20140167609
    Abstract: There are provided a light driving apparatus capable of being commonly used in various types of dimmers, and a driving method therefor. The light driving apparatus includes: a driving unit supplying driving power to a light emitting device according to controlling to drive the light emitting device; and a general-purpose dimming controlling unit controlling dimming of the light emitting device by converting a range of a brightness control signal of an external dimmer into a first voltage range according to a preset ratio to control the supply of power from the driving unit.
    Type: Application
    Filed: June 27, 2013
    Publication date: June 19, 2014
    Inventors: Byoung Woo RYU, Kyu Tae SEO, Dae Hoon CHOI, Ki Hong KIM, Min Jin KIM
  • Publication number: 20140159603
    Abstract: There are provided an LED driving apparatus and an LED driving method. The LED driving apparatus includes a rectifying unit rectifying AC power; a light emitting unit including a plurality of light emitting diodes; a switching unit including a plurality of switching elements connected to the plurality of light emitting diodes; and a controlling unit controlling operations of the plurality of light emitting diodes, wherein the controlling unit controls a duty ratio of a turned-on switching element based on a level of the AC power within respective turning-on periods of the plurality of switching elements.
    Type: Application
    Filed: April 19, 2013
    Publication date: June 12, 2014
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Keun Wook LEE, Byoung Woo RYU, Hong Sun PARK, Heung Gyoon CHOI
  • Patent number: 8699241
    Abstract: There is provided a switching mode power supply including: a direct current (DC)/DC converting unit converting a DC power level; an auxiliary power supply unit discharged in a no load mode in which a load is not connected to an output terminal of the DC/DC converting unit; and a controlling unit sensing a change in impedance according to whether or not the load is connected to the output terminal to thereby determine whether or not the switching mode power supply is in the no load mode, and driving a pulse width modulation integrated chip (PWM IC) when a voltage level of the auxiliary power supply unit is at a preset level or less in the no load mode.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: April 15, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Byoung Woo Ryu, Young Woon Choi, Seong Wook Choi
  • 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
  • Publication number: 20120256491
    Abstract: There is provided a switching mode power supply including: a direct current (DC)/DC converting unit converting a DC power level; an auxiliary power supply unit discharged in a no load mode in which a load is not connected to an output terminal of the DC/DC converting unit; and a controlling unit sensing a change in impedance according to whether or not the load is connected to the output terminal to thereby determine whether or not the switching mode power supply is in the no load mode, and driving a pulse width modulation integrated chip (PWM IC) when a voltage level of the auxiliary power supply unit is at a preset level or less in the no load mode.
    Type: Application
    Filed: September 27, 2011
    Publication date: October 11, 2012
    Inventors: Byoung Woo RYU, Young Woon Choi, Seong Wook Choi
  • Patent number: 8194419
    Abstract: A switching mode power supply includes an EMI filter unit, a PFC unit, a DC/DC unit, a PFC controller including a feedback stage to which a link voltage at an output side of the PFC unit is fed back and an overvoltage protection stage, a DC/DC controller generating a burst mode operation signal in a light-load or no-load condition, an error signal generation unit for sensing an output voltage of the power supply to generate an error signal, and a control unit for enabling the PFC unit to operate in a burst mode by connecting the overvoltage protection stage and the feedback stage. When the error signal is smaller than a predetermined value, the DC/DC controller generates the burst mode operation signal. When the link voltage fed back to the feedback stage exceeds a threshold voltage of the overvoltage protection stage, the PFC controller deactivates the PFC unit.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: June 5, 2012
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Byoung Woo Ryu, Gun Woo Moon, Seong Wook Choi, Byoung Hee Lee, Dong Seong Oh