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권민준,이우철 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.2
This paper describes a no-load control method of an LLC resonant converter for a plasma sputtering process using a fullbridge structure. Initially, the plasma sputtering process needs to operate under a no-load condition to produce a plasma. The operation characteristics of an LLC resonant converter obtained by the conventional analysis are diff erent from the actual noload condition. Therefore, the no-load characteristics of an LLC resonant converter must be analyzed and the control method of the no-load condition must be studied. In this paper, the no-load characteristic of an LLC resonant converter was analyzed considering the parasitic component. It also described a method for controlling an LLC resonant converter via the full-bridge structure in a no-load condition. The analysis and control operation were confi rmed through simulation and experiment.
광학파이버와 포토다이오드를 이용한 화염 자발광 특성에 대한 실험적 연구
권민준(Minjun Kwon),김세원(Sewon Kim),이창엽(Changyeop Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This study is aiming to establish the relationship between the optical signal of flame through an optical fiber and the equivalent ratio of flame. In this experiment, flame optical signal in a furnace is measured using optical fiber and photodiode. The combustion system is composed of 1.4MW turbulent burner and industrial boiler, and flame chemiluminescence is measured at various experimental conditions. In this study, the flame chemiluminescence of turbulent premixed flame is measured using commercially available photodiode. It is experimentally investigated the relationship between equivalent ratio and photodiode signal. In addition, the strategy of combustion control method is proposed using the optical signal and fuel pressure. The results showed that certain relationship between optical data of photodiode and equivalence ratio exists, and these results lead the successful application of this system for instantaneous measurement of equivalence ratio of the combustion system.