Patents by Inventor Hwa Soo Choi

Hwa Soo Choi 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).

  • High voltage DC power supplier
    Patent number: 6762514
    Abstract: A high voltage DC power supplier includes: a transformer driven by a switching device, transforming an input voltage to a certain level of high voltage, and outputting the transformed high voltage; a diode and a capacitor for rectifying and smoothing the high voltage outputted from the transformer, and supplying the smoothed voltage to an ER fluid application unit; a discharge circuit for forcibly discharging the output voltage when an output voltage of the capacitor descends; and a controller for controlling a turn-on operation of the switching device on the basis of a difference value between the output voltage and a reference voltage so that the output voltage can follow a target voltage, and outputting a control signal for driving the discharge circuit to the discharge circuit when it reaches a discharge period.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: July 13, 2004
    Assignee: Agency for Defense Development
    Inventors: Moon Suk Suh, Min Jae Shin, Kyo Jun Choi, In Sik Han, Sun Kyu Jeong, Se Kyu Chung, Tae Whee Joung, Hwa Soo Choi
  • High voltage DC power supplier
    Publication number: 20030206421
    Abstract: A high voltage DC power supplier includes: a transformer driven by a switching device, transforming an input voltage to a certain level of high voltage, and outputting the transformed high voltage; a diode and a capacitor for rectifying and smoothing the high voltage outputted from the transformer, and supplying the smoothed voltage to an ER fluid application unit; a discharge circuit for forcibly discharging the output voltage when an output voltage of the capacitor descends; and a controller for controlling a turn-on operation of the switching device on the basis of a difference value between the output voltage and a reference voltage so that the output voltage can follow a target voltage, and outputting a control signal for driving the discharge circuit to the discharge circuit when it reaches a discharge period.
    Type: Application
    Filed: January 23, 2003
    Publication date: November 6, 2003
    Applicant: Agency for Defense Development
    Inventors: Moon Suk Suh, Min Jae Shin, Kyo Jun Choi, In Sik Han, Sun Kyu Jeong, Se Kyu Chung, Tae Whee Joung, Hwa Soo Choi