Patents by Inventor Hee Duk Oh

Hee Duk Oh 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).

  • Power supply for power factor correction and driving method thereof
    Patent number: 7151360
    Abstract: A power supply for power factor correction and a driving method thereof wherein a ripple current of a power factor correction circuit (PFC) can be reduced to enhance a power factor and an efficiency. In the power supply, a power factor correction circuit corrects a power factor of a AC voltage supplied from an AC voltage source using a switching device to convert it to a DC voltage. A DC to DC converter converts said DC voltage from the power factor correction circuit into a desired DC voltage. A controller controls the switching device in accordance with an input voltage inputted to the power factor correction circuit to vary an output voltage of the power factor correction circuit.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: December 19, 2006
    Assignee: LG Electronics Inc.
    Inventors: Bong Gyun Kim, Nam Kyu Lee, Hee Duk Oh