Patents by Inventor Jae-dong Choi

Jae-dong 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).

  • Publication number: 20230132923
    Abstract: According to the present invention, an output inductor, rather than being composed of a separate inductor element, is magnetically coupled to a third inductor and a fourth inductor constituting a second transformer. Thus, compared to the case in which the output inductor is composed of the separate inductor element independently of the third inductor and the fourth inductor, the cost as well as the volume of the DC-DC conversion device can be reduced.
    Type: Application
    Filed: November 24, 2020
    Publication date: May 4, 2023
    Inventors: Jung Un PARK, Ja-Chun KOO, Sang-Kyoo HAN, Ji Hun BAE, Nayoung LEE, Jae Dong CHOI
  • Patent number: 10601326
    Abstract: A flyback converter is provided, which includes a transformer comprising a primary winding and a secondary winding, the transformer for transforming a power inputted from an input power supply and outputting the transformed power, a switching part having one end connected to the primary winding and the other end connected to the input power supply, and an auxiliary circuit including an auxiliary capacitor, and an auxiliary winding coupled to the primary winding. In addition, a clamping diode and a two-series connected switch structure is utilized for the switch stage to relieve the voltage stress of the switch. Accordingly, it is possible to reduce the voltage stress of the switch and also reduce the ripple of the input current which are the causes of EMI.
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: March 24, 2020
    Assignees: Korea Aerospace Research Institute, Kookmin University Industry Academy Cooperation Foundation
    Inventors: Na Young Lee, Jae Dong Choi, Sang Kyoo Han, Ju Young Lee
  • Publication number: 20190363632
    Abstract: A flyback converter is provided, which includes a transformer comprising a primary winding and a secondary winding, the transformer for transforming a power inputted from an input power supply and outputting the transformed power, a switching part having one end connected to the primary winding and the other end connected to the input power supply, and an auxiliary circuit including an auxiliary capacitor, and an auxiliary winding coupled to the primary winding. In addition, a clamping diode and a two-series connected switch structure is utilized for the switch stage to relieve the voltage stress of the switch. Accordingly, it is possible to reduce the voltage stress of the switch and also reduce the ripple of the input current which are the causes of EMI.
    Type: Application
    Filed: May 23, 2019
    Publication date: November 28, 2019
    Applicants: KOREA AEROSPACE RESEARCH INSTITUTE, KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION
    Inventors: Na Young LEE, Jae Dong CHOI, Sang Kyoo HAN, Ju Young LEE
  • Publication number: 20190173385
    Abstract: A DC-DC converter includes a first transformer connected between a first node and a ground, the first node being located between an input terminal and an output terminal, and the first transformer comprising a first inductor and a second inductor magnetically coupled to each other, a first switch serially connected to the first inductor, between the first node and the ground, a second switch serially connected to the second inductor, between the first node and the ground, a third switch connected between a second node and the output terminal, the second node being located between the second inductor and the second switch, and a fourth switch connected between a third node and the output terminal, the third node being located between the first inductor and the first switch, and the third and fourth switch being controlled in a same manner as the first and second switch, respectively.
    Type: Application
    Filed: November 15, 2018
    Publication date: June 6, 2019
    Applicant: KOREA AEROSPACE RESEARCH INSTITUTE
    Inventors: Jeong Eon Park, Nayoung Lee, Jae-dong Choi, Jin Baek Jang, Sang-ryool Lee