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보조 권선 변압기를 이용한 자기 구동 능동 클램프 포워드 컨버터
임범선,김창선 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
A new self-driven active clamp forward converter, in which the extra driving circuit for the active clamp switch is not required, is proposed. In the proposed converter, the auxiliary winding is used instead of the extra driving circuit to drive the active clamp switch so that the converter has a simple structure comparing to the conventional one. The operation principles of the proposed converter, in which the synchronous rectification is employed, are presented. And the experimental results for the prototype converter of 100W(5V/20A) are also presented to verify the validity of the proposed converter.
변압기 보조권선을 이용한 자기 구동 능동 클램프 포워드 컨버터
이광운,林範善,김희준 대한전자공학회 2003 電子工學會論文誌-SC (System and control) Vol.40 No.9
This study proposes a new self-driven active clamp forward converter eliminating the extra drive circuit for the active clamp switch. The converter used the auxiliary winding of the power transformer to drive the active clamp switch and a simple R-C circuit to get the dead time between the two switches. The operation principle was presented and experimental results were used to verify theoretical predictions. A 100-W (5V/20A) prototype converter built that only exhibited 1.5-turn winding number in the auxiliary winding was sufficient to drive the active clamp switch on the input of 50V. Finally, the measured efficiency of the converter was presented and the maximum efficiency of 91% was obtained. 본 논문에서는 능동 클램프 스위치를 위한 별도의 구동 회로가 생략된 새로운 자기 구동 능동 클램프 포워드 컨버터를 제안하였다. 능동 클램프 스위치의 구동에는 컨버터 자체의 변압기의 보조 권선을 이용하였고, 두 스위치 구동 신호 사이의 데드 타임을 설정하기 위하여 간단한 R-C지연 회로를 추가하였다. 제안된 컨버터의 동작 원리를 제시하였고 실험 결과를 가지고 이론적인 결과를 입증하였다. 출력 100W(5V/20A)의 컨버터를 제작하였으며, 입력이 50V일 때 능동 클램프 스위치의 구동에 단지 1.5T의 보조 권선의 권선수로 충분하다는 점을 보였다. 끝으로 제안된 컨버터의 측정 효율을 제시하였고 91%의 최대 효율을 달성하였다.
변압기 보조권선을 이용한 자기 구동 능동 클램프 포워드 컨버터
이광운,임범선,김희준 대한전자공학회 2003 電子工學會論文誌-SC (System and control) Vol.40 No.5
본 논문에서는 능동 클램프 스위치를 위한 별도의 구동 회로가 생략된 새로운 자기 구동 능동 클램프 포워드 컨버터를 제안하였다. 능동 클램프 스위치의 구동에는 컨버터 자체의 변압기의 보조 권선을 이용하였고, 두 스위치 구동 신호 사이의 데드 타임을 설정하기 위하여 간단한 R-C지연 회로를 추가하였다. 제안된 컨버터의 동작 원리를 제시하였고 실험 결과를 가지고 이론적인 결과를 입증하였다. 출력 100W(5V/20A)의 컨버터를 제작하였으며 입력이 50V일 때 능동 클램프 스위치의 구동에 단지 1.5T의 보조 권선의 권선수로 충분하다는 점을 보였다. 끝으로 제안된 컨버터의 측정 효율을 제시하였고 91%의 최대 효율을 달성하였다. This study proposes a new self-driven active clamp forward converter eliminating the extra drive circuit for the active clamp switch. The converter used the auxiliary winding of the power transformer to drive the active clamp switch and a simple R-C circuit to get the dead time between the two switches. The operation principle was presented and experimental results were used to verify theoretical predictions. A 100-W (5V/20A) prototype converter built that only exhibited 1.5-turn winding number in the auxiliary winding was sufficient to drive the active clamp switch on the input of 50V. Finally, the measured efficiency of the converter was presented and the maximum efficiency of 91% was obtained.
LLC 공진형 하프브릿지 컨버터의 동기정류기 구동회로에 관한 연구
안태영(Tae-Young Ahn),임범선(Bum-Sun Im) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.1
In this paper, we propose a current-driven synchronous rectifier driver circuit for LLC resonant half-bridge converters. The proposed driver circuit detects a relatively low current in the primary side of the transformer although a large current is flowing in the secondary side. Due to this feature, the driver circuit has a simple circuit structure and stabilizes the switching operation with a logic-level switching voltages for the synchronous rectifier. The operation and performance of the proposed driver circuit are confirmed with a prototype of 1kW class LLC resonant half-bridge converter. The experimental results proved that the proposed synchronous rectifier driver method improves the power conversion efficiency by around 1% and reduces the internal power loss by 17W.
역률개선용 스위칭 정류기의 데이터 수집과 저장에 관한 연구
안태영(Tae-Young Ahn),임범선(Bum-Sun Im) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.2
In this paper, a prototype of power supply with a power factor correction is proposed. As a unique feature the proposed power supply, a status monitoring circuit is embedded on the switching power supply. The status monitoring circuit analyzes the functionality of the system and saves the key components of the power supply in the case of malfunctions. The results of various fault tests are reported to verify the operation and performance of the proposed method. This paper discusses the experimental results of the monitoring module and provides the technical information to monitor, predict, and troubleshoot the system against the potential failure of power supplies for real applications.
푸시 풀 포워드 컨버터의 주파수 변화, 변압기의 권선비와 1차측 권선 변화에 대한 효율 특성
전준석(J.S. Jeon),김창선(C.S. Kim),김태식(T.S. Kim),임범선(B.S. Im),우승훈(S.H. Woo) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
The push pull forward converter is a very suitable circuit for low output voltage, high output current applications with a wide input voltage range. All the magnetic components (output inductor, transformer, input filter) can be integrated ioto a single core The integrated magnetics can reduce the number of the magnetic components Developed the push pull forward converter rating are of 36~72V input and 33V/30A output. In this converter, the efficiency was measured by 76.4% at full load and 82.95% at half load The maximum efficiency is up to 83% at 200kHz switching frequency, llA output.
벅+하프 브리지 컨버터에서 벅 컨버터의 출력 인덕턴스 값과 스위칭 주파수,변압기 코어 형태에 따른 효율 특성
박남진(N.J.Park),김창선(C.S.Kim),김태식(T.S.Kim),임범선(B.S.lm),우승훈 (S.H.Woo) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
We considered of the efficiency for the Buck+Half bridge converter Tins converter has advantages of applications for a low output voltage, a high output current and a wide input voltage Developed the Buck converter ratings and the Half Bridge converter ratings are 36-72V input and 22V/5A output, 19-24V input and 3.3V/30A output, respectively, Buck converter is operated with zero voltage switching process to reduce the switching losses The 80 1 -97 6% of the efficiency is measured at 184μH output filter inductance of Buck converter. In Half Bridge converter, the 86-96 4% of the efficiency is measured at 100kHz switching frequency with PQI core<br/>