Patents by Inventor Sang Yeal Kim

Sang Yeal Kim 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).

  • SMPS protection circuit in electronic appliance
    Patent number: 6462970
    Abstract: Disclosed is an SMPS protection circuit, which can prevent unnecessary electric power consumption that may be caused due to a light load as well as damage of the SMPS protection circuit caused by a heavy load. According to the SMPS protection circuit, a voltage lowered by the load is fed back. If the fed-back voltage corresponds to the light load, the switching frequency of an SMPS transformer is downed. If the fed-back voltage corresponds to the heavy load, the SMPS protection circuit ceases to operate.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: October 8, 2002
    Assignee: LG Electronics Inc.
    Inventor: Sang Yeal Kim
  • SMPS protection circuit in electronic appliance
    Publication number: 20020027785
    Abstract: Disclosed is an SMPS protection circuit, which can prevent unnecessary electric power consumption that may be caused due to a light load as well as damage of the SMPS protection circuit caused by a heavy load. According to the SMPS protection circuit, a voltage lowered by the load is fed back. If the fed-back voltage corresponds to the light load, the switching frequency of an SMPS transformer is downed. If the fed-back voltage corresponds to the heavy load, the SMPS protection circuit ceases to operate.
    Type: Application
    Filed: August 28, 2001
    Publication date: March 7, 2002
    Inventor: Sang Yeal Kim
  • Boost-up power factor correcting circuit using a power feedback
    Patent number: 5946201
    Abstract: A boost-up power factor correcting circuit using a power feed back capable of stably supplying the power source to the load by correcting a power factor, so that the power is fed-back in a high-frequency current using an auxiliary winding to be included in an SMPS transformer.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: August 31, 1999
    Assignee: LG Electronics Inc.
    Inventor: Sang Yeal Kim
  • Apparatus for controlling switching frequency of SMPS transformer for video display appliance
    Patent number: 5910887
    Abstract: An apparatus for controlling a switching frequency of a switching mode power supply (SMPS) for a video display appliance which can remove a switching noise generated during the switching-on and switching-off operations of an SMPS transformer by controlling the switching frequency of the SMPS transformer so that the duty of the SMPS transformer is kept in a predetermined range.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: June 8, 1999
    Assignee: LG Electronics, Inc.
    Inventor: Sang Yeal Kim
  • Output voltage stabilizing circuit of a power factor correction circuit at an initial power-on stage
    Patent number: 5909361
    Abstract: An output voltage stabilizing circuit of a power factor correction circuit, which initially stabilizes an output voltage of a power factor correction circuit by controlling an on/off timing of a reference oscillating waveform which varies in response to an error voltage in accordance with a charge/discharge voltage outputted from a soft start circuit section.
    Type: Grant
    Filed: September 3, 1997
    Date of Patent: June 1, 1999
    Assignee: LG Electronics Inc.
    Inventor: Sang Yeal Kim