Patents by Inventor Eung-Woo Lee

Eung-Woo Lee 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).

  • Patent number: 9979303
    Abstract: A primary-side regulation (PSR) power supply device according to the invention includes: a power switch; an auxiliary wiring from which an auxiliary voltage that depends on an output voltage is generated during a turn-off period of the power switch and being provided in a primary side; a clamping circuit clamping a voltage corresponding to the auxiliary voltage to a predetermined voltage; a voltage follower decreasing the sense voltage according to a decrease of the auxiliary voltage; and a switch control circuit controlling a switching operation of the power switch by using the sense voltage.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: May 22, 2018
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Hyun-Chul Eum, In-Ki Park, Eung-Woo Lee
  • Publication number: 20150207418
    Abstract: A primary-side regulation (PSR) power supply device according to the invention includes: a power switch; an auxiliary wiring from which an auxiliary voltage that depends on an output voltage is generated during a turn-off period of the power switch and being provided in a primary side; a clamping circuit clamping a voltage corresponding to the auxiliary voltage to a predetermined voltage; a voltage follower decreasing the sense voltage according to a decrease of the auxiliary voltage; and a switch control circuit controlling a switching operation of the power switch by using the sense voltage.
    Type: Application
    Filed: January 16, 2015
    Publication date: July 23, 2015
    Inventors: Hyun-Chul EUM, In-Ki PARK, Eung-Woo LEE
  • Patent number: 8760082
    Abstract: The present invention relates to an LED emitting device. The LED emitting device includes: a converter converting an input voltage according to a switching operation of a power source switch to generate at least two output voltages; an LED panel unit including a plurality of LED channels having a plurality of LEDs; a micom board operated by a first output voltage among the at least two output voltages to control the operation of the LED emitting device; a regulator converting a second output voltage among the at least two output voltages into a voltage suitable for the operation of the LED panel unit; and a multi-channel control unit controlling an operation of the regulator according to a lowest minimum voltage among the voltages of a plurality of LED channels and receiving the first output voltage to generate a first feedback voltage VF1.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: June 24, 2014
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Seunguk Yang, Byunghak Ahn, Hak-Hee Lee, Eung-Woo Lee
  • Patent number: 8519642
    Abstract: An LED light emitting device includes LED channels with LEDs, a transformer that converts an input voltage and supply an output voltage to the LED channels, a controller, and an LED driver. The controller controls the transformer according to a first feedback signal for interrupting power supply to the LED channels when a dimming off state in which currents are not supplied to the plurality of LED channels occurs or when a state in which the maximum channel voltage of a plurality of channel voltages corresponding to voltages applied to the LED channels, respectively, is an overvoltage and a defective state in which the plurality of LED channels include an open state are maintained during a predetermined threshold period. The LED driver generates information on the dimming off state and information on the defective state.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: August 27, 2013
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Byunghak Ahn, Hak-Hee Lee, Il-Young Jung, Eung-Woo Lee
  • Patent number: 8274235
    Abstract: An inverter according to exemplary embodiment of the present invention generates a plurality of feedback voltages corresponding to driving voltages of discharge lamps. The inverter generates a first minimum voltage having a smaller feedback voltage of a plurality of feedback voltages and compares the first minimum voltage and a short circuit reference voltage to determine a short circuit of at least two discharge lamps. Also, the inverter generates a plurality of feedback voltages corresponding to driving currents of a plurality of discharge lamps, generates a second minimum voltage having a smaller feedback voltage of a plurality of the feedback voltages, and compares the second minimum voltage and an open circuit reference voltage to determine the open circuit of the at least two discharge lamps.
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: September 25, 2012
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Jae-Soon Choi, Hak-Hee Lee, Il-Young Jung, Eung-Woo Lee
  • Publication number: 20120104956
    Abstract: The present invention relates to an LED emitting device. The LED emitting device includes: a converter converting an input voltage according to a switching operation of a power source switch to generate at least two output voltages; an LED panel unit including a plurality of LED channels having a plurality of LEDs; a micom board operated by a first output voltage among the at least two output voltages to control the operation of the LED emitting device; a regulator converting a second output voltage among the at least two output voltages into a voltage suitable for the operation of the LED panel unit; and a multi-channel control unit controlling an operation of the regulator according to a lowest minimum voltage among the voltages of a plurality of LED channels and receiving the first output voltage to generate a first feedback voltage VF1.
    Type: Application
    Filed: September 6, 2011
    Publication date: May 3, 2012
    Inventors: Seunguk YANG, Byunghak AHN, Hak-Hee LEE, Eung-Woo LEE
  • Publication number: 20110037407
    Abstract: The present invention relates to an LED light emitting device. An LED light emitting device includes a plurality of LED channels including a plurality of LEDs. The LED light emitting device further includes a transformer configured to convert an input voltage and supply an output voltage to the plurality of LED channels, a controller, and an LED driver. The controller controls the transformer according to a first feedback signal for interrupting power supply to the plurality of LED channels when a dimming off state in which currents are not supplied to the plurality of LED channels occurs or when a state in which the maximum channel voltage of a plurality of channel voltages corresponding to voltages applied to the plurality of LED channels, respectively, is an overvoltage and a defective state in which the plurality of LED channels include an open state are maintained during a predetermined threshold period. The LED driver generates information on the dimming off state and information on the defective state.
    Type: Application
    Filed: August 5, 2010
    Publication date: February 17, 2011
    Inventors: Byunghak AHN, Hak-Hee LEE, Il-Young JUNG, Eung-Woo LEE
  • Publication number: 20100327760
    Abstract: The present invention relates to an inverter and the driving method. The inverter according to exemplary embodiment of the present invention generates a plurality of feedback voltages corresponding to driving voltages of a plurality of discharge lamps. The inverter generates a first minimum voltage having a smaller feedback voltage of a plurality of feedback voltages and compares the first minimum voltage and a short circuit reference voltage in order to determine a short circuit of at least two discharge lamps. The inverter senses a short circuit lamp of a plurality of the discharge lamps by using the comparison result and a first sawtooth wave signal having a predetermined period.
    Type: Application
    Filed: June 14, 2010
    Publication date: December 30, 2010
    Inventors: Jae-Soon CHOI, Hak-Hee LEE, Il-Young JUNG, Eung-Woo LEE