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Paul Jang,Hye-Jin Kim,Bo-Hyung Cho 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
This study examines the zero-voltage switching (ZVS) operation of an active-clamped forward converter (ACFC) with a current-doubler rectifier (CDR). The ZVS condition can be obtained with a much smaller leakage inductance compared to that of a conventional ACFC. Due to the significantly reduced leakage inductance, the design is optimized and the circulating loss is reduced. The operation of the ACFC with a CDR is analyzed, and a detailed ZVS analysis is conducted on the basis of a steady-state analysis. From the results, a design consideration for ZVS improvement is presented. Loss analyses of the converters shows that enhanced soft-switching contributes to an efficiency improvement under light-load condition. Experimental results from a 100-W (5-V/20-A) prototype verify that the ACFC with a CDR can attain ZVS across an extended load range of loads and achieve a higher efficiency than conventional ACFCs.
Jang, Paul,Kim, Hye-Jin,Cho, Bo-Hyung The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
This study examines the zero-voltage switching (ZVS) operation of an active-clamped forward converter (ACFC) with a current-doubler rectifier (CDR). The ZVS condition can be obtained with a much smaller leakage inductance compared to that of a conventional ACFC. Due to the significantly reduced leakage inductance, the design is optimized and the circulating loss is reduced. The operation of the ACFC with a CDR is analyzed, and a detailed ZVS analysis is conducted on the basis of a steady-state analysis. From the results, a design consideration for ZVS improvement is presented. Loss analyses of the converters shows that enhanced soft-switching contributes to an efficiency improvement under light-load condition. Experimental results from a 100-W (5-V/20-A) prototype verify that the ACFC with a CDR can attain ZVS across an extended load range of loads and achieve a higher efficiency than conventional ACFCs.
Zero-Voltage Switching Analysis of Active-Clamped Forward Converter with Current-Doubler Rectifier
Paul Jang,Bo-Hyung Cho 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, an active-clamped forward converter (ACFC) with current-doubler rectifier (CDR) is investigated especially in the perspective of zero-voltage switching (ZVS) operation. By employing the CDR in the secondary, ZVS condition can be obtained with much smaller leakage inductance compared to the conventional ACFC. Due to the significantly reduced leakage inductance, circulating loss is reduced while ZVS of the main switch is maintained. These can be realized without any additional components, which make the proposed converter more feasible in many applications. ZVS operation of the proposed converter is analyzed in the paper. Experimental results with a 100-W (5-V/20-A) prototype verify that the proposed converter can attain ZVS more efficiently and achieve higher efficiency.
장바울(Paul Jang),백종복(Jongbok Baek),조보형(Bohyung Cho) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
브리지리스 역률 개선 회로는 브리지 정류단을 제거해서 전류 도통 경로에 존재하는 스위칭 소자의 개수를 최소화함으로 기존 역률 개선 회로 대비 효율 향상을 가능케 하는 기법이다. 본 논문에서는 새로운 토폴로지의 브리지리스 포워드-플라이백 역률 개선 회로를 제안한다. 제안된 회로는 포워드 컨버터와 플라이백 컨버터의 동작을 모두 이용함으로써 브리지 정류단 없이 효과적으로 역률을 개선할 수 있다. 또한 컨버터 입력과 출력 사이에 직류 접지가 분리되는 절연형 특성을 가지며, 변압기의 권선비에 따라 출력 전압을 조절할 수 있다. 제안된 회로의 성능은 모의 실험을 통해 검토한다.
Jang, In-Hwan,Chosa, Naoyuki,Kim, Sung-Hee,Nam, Hyuck-Jin,Lemaitre, Bruno,Ochiai, Masanori,Kambris, Zakaria,Brun, Sylvain,Hashimoto, Carl,Ashida, Masaaki,Brey, Paul T.,Lee, Won-Jae Elsevier 2006 Developmental cell Vol.10 No.1
<P><B>Summary</B></P><P>The Toll receptor was originally identified as an indispensable molecule for <I>Drosophila</I> embryonic development and subsequently as an essential component of innate immunity from insects to humans. Although in <I>Drosophila</I> the Easter protease processes the pro-Spätzle protein to generate the Toll ligand during development, the identification of the protease responsible for pro-Spätzle processing during the immune response has remained elusive for a decade. Here, we report a protease, called Spätzle-processing enzyme (SPE), required for Toll-dependent antimicrobial response. Flies with reduced SPE expression show no noticeable pro-Spätzle processing and become highly susceptible to microbial infection. Furthermore, activated SPE can rescue ventral and lateral development in embryos lacking Easter, showing the functional homology between SPE and Easter. These results imply that a single ligand/receptor-mediated signaling event can be utilized for different biological processes, such as immunity and development, by recruiting similar ligand-processing proteases with distinct activation modes.</P>