Patents by Inventor Ljubisa Dragolijub Stevanovic

Ljubisa Dragolijub Stevanovic 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).

  • AC-AC converter with high frequency link
    Patent number: 8644037
    Abstract: An AC-AC Converter for an AC source which in one embodiment has a first rectifier section rectifying the AC source into a first pulsed DC link voltage signal and a high frequency modulating section coupled to the first pulsed DC link voltage signal and producing a high frequency AC voltage signal. A high frequency transformer is coupled to the high frequency AC voltage signal producing a transformed high frequency AC signal. There is a second rectifier section coupled to the transformed high frequency AC signal and producing a second pulsed DC voltage signal and an unfolder section coupled to the second pulsed DC voltage signal and producing an output AC signal.
    Type: Grant
    Filed: July 15, 2008
    Date of Patent: February 4, 2014
    Assignee: General Electric Company
    Inventors: Ravisekhar Nadimpalli Raju, Richard S. Zhang, Ljubisa Dragolijub Stevanovic, Jeffrey Neal Slotnick, Robert Louis Steigerwald, Luis Jose Garces
  • AC-AC CONVERTER WITH HIGH FREQUENCY LINK
    Publication number: 20100014325
    Abstract: An AC-AC Converter for an AC source which in one embodiment has a first rectifier section rectifying the AC source into a first pulsed DC link voltage signal and a high frequency modulating section coupled to the first pulsed DC link voltage signal and producing a high frequency AC voltage signal. A high frequency transformer is coupled to the high frequency AC voltage signal producing a transformed high frequency AC signal. There is a second rectifier section coupled to the transformed high frequency AC signal and producing a second pulsed DC voltage signal and an unfolder section coupled to the second pulsed DC voltage signal and producing an output AC signal.
    Type: Application
    Filed: July 15, 2008
    Publication date: January 21, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Ravisekhar Nadimpalli Raju, Richard S. Zhang, Ljubisa Dragolijub Stevanovic, Jeffrey Neal Slotnick, Robert Louis Steigerwald, Luis Jose Garces
  • Switching amplifier for generating continuous arbitrary waveforms for magnetic resonance imaging coils
    Patent number: 6031746
    Abstract: A partial-voltage buck regulator controls a high-voltage bus to a full-bridge circuit such that overall switching losses are reduced and distributed. Low-voltage buck regulator devices are PWM-switched when high output voltage is needed, and high-voltage bridge devices are PWM-switched when low output voltage is needed. A variable input power supply, which may be operated in a high power factor mode, can adjust the input bus voltages to achieve optimum performance for a given magnetic resonance imaging sequence.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: February 29, 2000
    Assignee: General Electric Company
    Inventors: Robert Louis Steigerwald, William Frederick Wirth, Ljubisa Dragolijub Stevanovic, John Norton Park