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金龍(Yong Kim),裵辰容(Jin-Yong Bae),權純道(Soon-Do Kwon) 대한전기학회 2007 전기학회논문지 Vol.56 No.11
This paper presents the Efficiency Characteristic of Three-Level Converter. Three-Level DC/DC Converter presented in this paper is used a phase shift control with a flying capacitor in the primary side to achieve ZVS(Zero-Voltage-Switching) for the switch. This converter reduces the voltage stress across the main switch to half of input voltage. It shows the main reason of efficiency diminution, comparing of input and output voltage. Also, the loss analysis of each component and the various losses in the circuit are proposed in this paper. The result of the efficiency characteristics are verified using 3㎾ prototype.
정재욱,김룡,Chung, Jae-Wook,Kim, Yong 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.1
When missile is launched, a launcher needs to be leveled with accuracy to avoid the systems's instability. In general, a launcher is leveled by adjusting the stroke of leveling jacks; however, it is still challenge to control the leveling jacks fast and accurately. This paper thus proposed an innovative algorithm for compensating ground inclination of a missile launcher to expand operational field of a missile launcher. Using two inclinometers attached on a launcher, a base jack for leveling is selected and the mixed gradient where launcher stands on can be estimated. Due to the limited stroke, the launcher can compensate its ground inclination within maximum stroke margin. Then, the ground inclination of a launcher can be compensated by calculated angle using weighting factors. The effectiveness of proposed algorithm is proved with a prototype missile launcher.
1차측 보조회로를 이용한 Three-Level 컨버터에 관한 연구
裵辰容(Jin-Yong Bae),金龍(Yong Kim),曺圭滿(Kyu-Man Cho) 대한전기학회 2008 전기학회논문지 Vol.57 No.6
A New ZVS(Zero Voltage Switching) and ZVZCS(Zero Voltage and Zero Current Switching) Three-Level Converter is proposed. The proposed converter presented in this paper used a phase shift control with a flying capacitor in the primary side to achieve ZVS for the all switch. A primary auxiliary circuit, which consists of one coupled inductor, is added in the primary to provide ZVZCS conditions to primary switches. Many advantages including simple circuit topology high efficiency, and low cost make this converter attractive for high power applications. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 2㎾ (27V, 74A) 40 ㎑ IGBT based experimental circuit.
裵辰容(Jin-Yong Bae),金龍(Yong Kim),曺圭滿(Kyu-Man Cho) 대한전기학회 2006 전기학회논문지 B Vol.55 No.3
A New ZVZCS(Zero-Voltage and Zero-Current-Switching) Three-Level DC/DC Converter is proposed. The proposed converter presented in this paper used a phase shift control with a flying capacitor in the primary side to achieve ZVS for the outer switch. A primary auxiliary circuit, which consists of one coupled inductor, is added in the primary to provides ZVZCS conditions to primary switches, ZVS for outer switches and ZCS for inner switches. Many advantages including simple circuit topology high efficiency, and low cost make this converter attractive for high power applications. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 2㎾ 40㎑ IGBT based experimental circuit.