Patents by Inventor Joo-Han Yoon

Joo-Han Yoon 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: 20210051785
    Abstract: A switching driving circuit includes a switch configured to switch a current supplied to a target circuit, a sensing resistor connected to the switch, a controller configured to control the switch by comparing a sensing voltage applied to the sensing resistor with a reference voltage, and a compensation circuit configured to regulate the reference voltage based on an amount of variation of an input voltage input into the target circuit and an output voltage output from the target circuit.
    Type: Application
    Filed: April 15, 2020
    Publication date: February 18, 2021
    Applicant: MagnaChip Semiconductor, Ltd.
    Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN
  • Publication number: 20210021191
    Abstract: An integration circuit is provided. The integration circuit includes a current source, a capacitor connected in series with the current source, a voltage source bias connected in series with the capacitor, a switch configured to connect a first node between the current source and the capacitor and a second node between the capacitor and the voltage source bias; and a switch control logic unit configured to control an on/off operation of the switch, wherein an integration operation is performed by the current source and the capacitor.
    Type: Application
    Filed: March 26, 2020
    Publication date: January 21, 2021
    Applicant: MagnaChip Semiconductor Ltd.
    Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN, Jay LEE
  • Patent number: 8773349
    Abstract: A backlight driving circuit that provides backlight to a display panel of a display apparatus includes a power supply unit configured to supply power, a converter configured to convert and output a voltage of the supplied power, a light-emitting module supplied with the outputted voltage from the converter and providing the backlight, a switch connected to an output terminal of the light-emitting module and controlling an operation of the light-emitting module, a feedback resistor connected to an output terminal of the switch and sensing a voltage of a current flowing in the light-emitting module, a short-circuit sensing resistor connected between a ground of the power supply unit and a ground of the feedback resistor, and a short-circuit sensor configured to sense a voltage value of a current applied to the feedback resistor or the short-circuit sensing resistor according to whether the switch is switched on or off.
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: July 8, 2014
    Assignee: Magnachip Semiconductor, Ltd.
    Inventors: Joo-han Yoon, Young-gi Ryu
  • Publication number: 20120182328
    Abstract: A backlight driving circuit that provides backlight to a display panel of a display apparatus includes a power supply unit configured to supply power, a converter configured to convert and output a voltage of the supplied power, a light-emitting module supplied with the outputted voltage from the converter and providing the backlight, a switch connected to an output terminal of the light-emitting module and controlling an operation of the light-emitting module, a feedback resistor connected to an output terminal of the switch and sensing a voltage of a current flowing in the light-emitting module, a short-circuit sensing resistor connected between a ground of the power supply unit and a ground of the feedback resistor, and a short-circuit sensor configured to sense a voltage value of a current applied to the feedback resistor or the short-circuit sensing resistor according to whether the switch is switched on or off.
    Type: Application
    Filed: January 13, 2012
    Publication date: July 19, 2012
    Applicant: MAGNACHIP SEMICONDUCTOR, LTD.
    Inventors: Joo-han Yoon, Young-gi Ryu
  • Patent number: 7518836
    Abstract: A switching mode power supply and a corresponding method of protection operation is presented. A switching controller of the switching mode power supply receives current sensing information corresponding to the current flowing through a main switch and feedback information corresponding to an output voltage through a single terminal, and performs a protection operation when the voltage at the terminal is maintained to be lower than a reference voltage for more than a predetermined time frame. The power supply requires a low number of terminals, while preserving the protection operation function.
    Type: Grant
    Filed: February 22, 2006
    Date of Patent: April 14, 2009
    Assignee: Fairchild Korea Semiconductor, Ltd.
    Inventors: Jung-Won Kim, Joo-Han Yoon
  • Publication number: 20060209481
    Abstract: A switching mode power supply and a corresponding method of protection operation is presented. A switching controller of the switching mode power supply receives current sensing information corresponding to the current flowing through a main switch and feedback information corresponding to an output voltage through a single terminal, and performs a protection operation when the voltage at the terminal is maintained to be lower than a reference voltage for more than a predetermined time frame. The power supply requires a low number of terminals, while preserving the protection operation function.
    Type: Application
    Filed: February 22, 2006
    Publication date: September 21, 2006
    Inventors: Jung-Won Kim, Joo-Han Yoon