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32인치 LCD TV용 면광원 램프의 최적 구동에 관한 연구
김범준,노정욱,홍성수,사공석진 국민대학교 생산기술연구소 2004 공학기술논문집 Vol.27 No.-
Characteristic properties of backlight arraying electrodeless fluorescent lamps assembled with capacitive coupled electrode connector have been investigated in various frequencies with a switching inverter. In the backlight of a 17-in diagonal with 12 lamps driven by square pulses, the efficiency of 100 lm/W and the luminance of 10000~14000 cd/㎡ have been achieved in the frequency range of 20~60 kHz where the higher frequency provides the lower operating voltage in the range of 2~4 kV.
Chung-Wook Roh,Bok-Man Kim,Gun-Woo Moon,Myung-Joong youn 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
A new single phase power factor correction rectifier/regulator with dc linked energy feedback circuit is proposed, which is capable of achieving the zero voltage switching (ZVS) of a boost rectifier stage without any auxil-laiy switch. The performance of the proposed recti-fier/reguiator is demonstrated through a 200 W, 90 kHz prototype. This proposed rectifier/regulator with dc linked energy feedback circuit is particularly suited for distributed power system applications.<br/>
Chung-Wook Roh,Bok-Man Kim,Gun-Woo Moon,Myung-Joong Youn 한국정보과학회 1998 Journal of Electrical Engineering and Information Vol.3 No.6
A new single phase power factor correction rectifier/regulator with de linked energy feedback circuit is proposed, which is capable of achieving the zero voltage switching (ZVS) of a boost rectifier stage without any auxiliary switch. The proposed rectifier/regulator gives the good power factor correction (PFC), low current harmonic distortion, and tight output voltage regulation. Moreover, with the proposed scheme, a low cost, high efficiency, and high power density single phase rectifier/regulator can be designed, which is superior to that of a conventional PFC ZVS boost rectifier followed by a ZVS half-bridge dc-dc converter. The operation of the proposed rectifier/regulator is thoroughly analyzed. Also the control strategy and implementation are provided in details. The performance of the proposed rectifier/regulator is demonstrated through a 200W, 90 kHz prototype. This proposed rectifier/regulator with de linked energy feedback circuit is particularly suited for distributed power system applications.
Polarity Inversion DC-DC Power Conversion Circuit with High Voltage Step-up Ratio
Roh, Chung-Wook,Yoo, Cheol-Hee,Jung, Dong-Yeol,Sak, Sug-Chin The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
A novel polarity inversion dc-dc power conversion circuit that features the high input to output step-up voltage conversion ratio characteristics is presented for high voltage DC power supply applications. The proposed circuit features the reduced voltage stresses of the components compared to those of the conventional ones. The operational principles of the proposed circuit are analyzed and comparative features are presented. The simulation results and experimental results are presented to verify the validity of the proposed circuit.
Polarity Inversion DC-DC Power Conversion Circuit with High Voltage Step-up Ratio
Chung-Wook Roh,Cheol-Hee Yoo,Dong-Yeol Jung,Sug-Chin Sakong 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.5
A novel polarity inversion dc-dc power conversion circuit that features the high input to output step-up voltage conversion ratio characteristics is presented for high voltage DC power supply applications. The proposed circuit features the reduced voltage stresses of the components compared to those of the conventional ones. The operational principles of the proposed circuit are analyzed and comparative features are presented. The simulation results and experimental results are presented to verify the validity of the proposed circuit.
축전지 구동 응용을 위한 새로운 승압형 DC/DC 컨버터
노정욱(Chung-Wook Roh),한승훈(Seung-Hoon Han),윤명중(Myung-Joong Youn) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A new Isolated boost de to de convertor suitable for a low input voltage application is proposed. The proposed convertor features the low switch current stresses, the wide input voltage range operation, and the inherent inrush cur-rent protection characteristics, essential to design a low to high voltage conversion Circuit A comparative analysis and experimental results are presented to show the validity of the proposed convertor
전류 분할 및 통합 자기 구조를 가지는 새로운 승압형 푸쉬-풀 전력 변환 회로
노장욱(Chung-Wook Roh),김현수(Hyun-Soo Kim),문건우(Gun-Woo Moon),윤명중(Myung-Joong Youn) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
An improved current-fed push-pull PWM converter with integrated magnetics is presented With this improved topology, the design of magnetic elements such as an inductor and a transformer becomes easter than that using the conventional topology, especially when the converter is suffered from an extremely high input current Since this gives twice the voltage conversion ratio compared to the conventional one, it is also suited for the high voltage step-up power conversion process The operation of the proposed converter is thoroughly analyzed Also, the theoretical analysis and expenmental results are taken from the laboratory level prototype.<br/>