Patents by Inventor JongHa Shin

JongHa Shin 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).

  • Isolated flyback converter for light emitting diode driver
    Patent number: 9190917
    Abstract: An isolated flyback converter for an LED driver may include: (1) A snubber circuit configured to be connected to the primary side of a transformer. (2) A switching unit configured to have a source terminal and a drain terminal and configured to be turned on or off. (3) A control unit configured to detect a first input signal proportional to a fluctuation in the power supply voltage, detect a second input signal when the switching unit is turned off, generate a signal inversely proportional to the maximum value of the first input signal and multiply the generated signal to the second input signal, and control a peak current of the switching unit to be proportional to the multiplication result of the signal inversely proportional to the maximum value of the first input signal and the second input signal such that a secondary-side current of the transformer is maintained constant.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: November 17, 2015
    Assignee: Dongbu HiTek Co., Ltd.
    Inventors: Jong Tae Hwang, Moonsang Jung, Daeho Kim, SooHyun Moon, JongHa Shin, MinHo Jung, JunHong Lee
  • ISOLATED FLYBACK CONVERTER FOR LIGHT EMITTING DIODE DRIVER
    Publication number: 20130063039
    Abstract: An isolated flyback converter for an LED driver may include: (1) A snubber circuit configured to be connected to the primary side of a transformer. (2) A switching unit configured to have a source terminal and a drain terminal and configured to be turned on or off. (3) A control unit configured to detect a first input signal proportional to a fluctuation in the power supply voltage, detect a second input signal when the switching unit is turned off, generate a signal inversely proportional to the maximum value of the first input signal and multiply the generated signal to the second input signal, and control a peak current of the switching unit to be proportional to the multiplication result of the signal inversely proportional to the maximum value of the first input signal and the second input signal such that a secondary-side current of the transformer is maintained constant.
    Type: Application
    Filed: May 16, 2012
    Publication date: March 14, 2013
    Applicant: Dongbu HiTek Co., Ltd.
    Inventors: Jong Tae HWANG, Moonsang Jung, Daeho Kim, SooHyun Moon, JongHa Shin, MinHo Jung, JunHong Lee