Patents by Inventor JUNG MUK CHOI

JUNG MUK 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).

  • Method for compensating instantaneous power failure in medium voltage inverter and medium voltage inverter system by using the same
    Patent number: 8970159
    Abstract: Provided are a method for compensating instantaneous power failure in medium voltage inverter and a medium voltage inverter system by using the same, the method for compensating instantaneous power failure in medium voltage inverter including a plurality of power cells supplying a phase voltage to a motor by being connected to the motor in series, the method including decreasing an output frequency of the plurality of power cells by as much as a predetermined value at a relevant point where an input voltage of the plurality of power cells is less than a reference value, decreasing the output frequency at a predetermined deceleration gradient, and maintaining the output frequency during restoration of input voltage as long as a predetermined time, in a case the input voltage is restored.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: March 3, 2015
    Assignee: LSIS Co., Ltd.
    Inventors: Jung Muk Choi, Seung Ho Na, Jae Hyun Jeon, Sung Guk Ahn
  • METHOD FOR COMPENSATING INSTANTANEOUS POWER FAILURE IN MEDIUM VOLTAGE INVERTER AND MEDIUM VOLTAGE INVERTER SYSTEM BY USING THE SAME
    Publication number: 20130076285
    Abstract: Provided are a method for compensating instantaneous power failure in medium voltage inverter and a medium voltage inverter system by using the same, the method for compensating instantaneous power failure in medium voltage inverter including a plurality of power cells supplying a phase voltage to a motor by being connected to the motor in series, the method including decreasing an output frequency of the plurality of power cells by as much as a predetermined value at a relevant point where an input voltage of the plurality of power cells is less than a reference value, decreasing the output frequency at a predetermined deceleration gradient, and maintaining the output frequency during restoration of input voltage as long as a predetermined time, in a case the input voltage is restored.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 28, 2013
    Applicant: LSIS CO., LTD.
    Inventors: JUNG MUK CHOI, SEUNG HO NA, JAE HYUN JEON, SUNG GUK AHN