Patents by Inventor Nak Young KO

Nak Young KO 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).

  • Using a digital delay locked loop synchronous direct current to reduce the electromagnetic interference-wave control method of a DC buck converter and the switching signal
    Patent number: 9225248
    Abstract: A synchronous direct current (DC)-DC buck converter and a method of controlling the waveforms of switching signals disclosed herein. The synchronous DC-DC buck converter generates a stepped-down output voltage using a first switch configured to apply an input voltage to an inductor and a second switch configured to switch in response to a second switching signal. The synchronous DC-DC buck converter includes a sawtooth generation unit, a driver oscillating signal generation unit, a switching signal generation unit, and a phase tracking unit. The sawtooth generation unit generates a sawtooth wave. The driver oscillating signal generation unit generates an error voltage between the output voltage and a reference voltage, and compares the sawtooth wave with the error voltage, so as to generate a driver oscillating signal. The switching signal generation unit generates each of the first and second switching signals. The phase tracking unit generates the frequency setting signal.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: December 29, 2015
    Assignee: Research & Business Foundation SUNGKYUNKWAN UNIVERSITY
    Inventors: Kang Yoon Lee, Hong Jin Kim, Young Jun Park, Jeong Ah Jang, Nak Young Ko, Dong Hyeon Seo
  • USING A DIGITAL DELAY LOCKED LOOP SYNCHRONOUS DIRECT CURRENT TO REDUCE THE ELECTROMAGNETIC INTERFERENCE-WAVE CONTROL METHOD OF A DC BUCK CONVERTER AND THE SWITCHING SIGNAL
    Publication number: 20150263625
    Abstract: A synchronous direct current (DC)-DC buck converter and a method of controlling the waveforms of switching signals disclosed herein. The synchronous DC-DC buck converter generates a stepped-down output voltage using a first switch configured to apply an input voltage to an inductor and a second switch configured to switch in response to a second switching signal. The synchronous DC-DC buck converter includes a sawtooth generation unit, a driver oscillating signal generation unit, a switching signal generation unit, and a phase tracking unit. The sawtooth generation unit generates a sawtooth wave. The driver oscillating signal generation unit generates an error voltage between the output voltage and a reference voltage, and compares the sawtooth wave with the error voltage, so as to generate a driver oscillating signal. The switching signal generation unit generates each of the first and second switching signals. The phase tracking unit generates the frequency setting signal.
    Type: Application
    Filed: March 13, 2015
    Publication date: September 17, 2015
    Applicant: Research & Business Foundation SUNGKYUNKWAN UNIVERSITY
    Inventors: Kang Yoon LEE, Hong Jin KIM, Young Jun PARK, Jeong Ah JANG, Nak Young KO, Dong Hyeon SEO