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탭-인덕터적용 무손실 스터버에의한 소프트스위칭 Buck 컨버터
김은수(E.S. Kim),박성수(S.S. Park),공영수(Y.S. Gong),최선호(S.H. Choi),강도현(D.H. Kang),조기연(K.Y. Joe),이진수(J.S. Lee) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper presents an improved soft switching Buck converter using an energy recovery snubber which is composed of a tapped inductor, two snubber capacitors and three snubber diodes The proposed Buck converter achieves zero voltage turn-off in the main power switch and freewheeling diode. The operating principle of the proposed Buck converter is described through the simulation, relevant equations and analysis
김은수(E. S. Kim),박경남(K. N. Park) 한국재활복지공학회 2021 재활복지공학회논문지 Vol.15 No.3
본 논문의 목적은 다리의 근육 손실로 보행이 어려운 사람이나 하체 마비 등으로 다리를 움직일 수 없어 재활이 필요한 사람들에게 재활 지원을 위한 보조장치를 개발하고자 한다. 이 논문은 모터와 함께 무릎 관절의 움직임을 돕기 위해 다리에 외골격을 추가하고 무릎 관절은 허벅지 근육의 수축과 이완을 통해 작동한다. 대퇴직근과 대퇴 이두근에 EMG (ElectroMyoGraphy) 센서를 부착하여 근육의 수축과 이완을 인지하고 그에 따라 모터를 작동시켜 보행을 보조하는데 사용한다. 움직임 자체가 불가능한 경우 키패드를 사용하여 일련의 저장된 움직임을 수행하여 다리 재활에 도움을 주도록 하였다. 그 결과 보행이 어려운 사람들에게 안정감을 더해주고 안전사고를 예방하며, 재활운동을 도와 일상생활로 복귀할 수 없는 사람들을 도울 수 있는 가능성이 있음을 확인하였다. The purpose of this paper is to develop rehabilitation assistance to those who have difficulty walking due to muscle loss in their legs or who need rehabilitation due to inability to move their legs, such as paralysis of the lower body. This paper adds exoskeleton to the leg to assist the movement of the knee joint with the motor. The knee joint operates through contraction and relaxation of thigh muscles. This is used to attach an EMG(ElectroMyoGraphy) sensor to the rectus femoris muscle and muscle biceps femoris to recognize muscle contraction and relaxation, and to assist walking by operating the motor accordingly. If movement itself is impossible, use a keypad to perform a series of stored movements to help with leg rehabilitation. As a result, we confirmed the possibility that it adds stability to those who have difficulty walking, preventing safety accidents, and helping those who are unable to move back to their daily life by helping with rehabilitation exercises.
김은수(E.S.Kim),최해영(H.Y Choi),조기연(K.Y.Joe),계문호(M.H.Kye),김윤호(Y.H.Kim) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
The conventional high frequency phase-shifted full bridge dc/dc converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current, RMS current stress, conduction losses of transformer and<br/> switching devices are increased. To alleviate this problem, this paper provides a<br/> circulating current free type high frequency soft switching phase-shifted full bridge (FB) dc/dc converter with energy recovery snubber (ERS) attached at the secondary side of transformer. The energy recovery snubber (ERS) adopted in this study is consisted of three fast recovery diode(Dsl, DS2, Ds3), two resonant capacitor (Csl, Cs2).
김은수(E.S Kim),이현관(H.K Lee),송정민(J.M Song),김병수(B.S Kim),차인수(I.S Cha) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
An 8㎾ L-Type boost dc/dc converter using a non-dissipative snubber is presented. L-Type boost converter is used to increase low input voltage (24VDC) to the isolated high output voltage (250VDC) and is selected because of its low switch counts, low conduction loss, simple transformer structure with low turns ratio and easy operation. In addition, due to the use of a non-dissipative snubber on the primary side, a L-Type boost converter has a significant reduction of switching losses in the main switching devices. he complete operating principles, analysis and experimental results in this paper are described.