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김철진(Cherl-Jin Kim),박현철(Hyun-Cherl Park),박정오(Jung-Oh Park) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
This paper presents an architecture for driving multiple parallel cold cathode fluorescent lamps (CCFLs) for back lighting applications. The key to the architecture is a proposed capacitive coupling approach for lamp ignition. This system is consist of a fly back converter, a single inverter to drive multiple lamps and conductive floating reflector. The topology is capable of driving a number of parallel lamps with independent accurate lamp, current regulation and improving cost effectiveness with significant reduction in size and weight, compared to typical high frequency ac ballast. Experimental demonstration results for ten of parallel CCFLs with simultaneous ignition.
박정오(Jung-Oh Park),김철진(Cherl-Jin Kim),박현철(Hyun-Cherl Park) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
This paper presents an architecture for driving multiple paralleled cold cathode fluorescent lamps (CCFLs) for back lighting applications. Multi CCFL operation and increase of brightness, the key to the architecture is a proposed capacitive coupling approach for lamp ignition. This system is consist of a flyback converter, a single inverter to drive multiple lamps and conductive floating reflector. The topology is capable of driving a number of parallel lamps with independent accurate lamp, The capacitive coupling the leakage inductance and stray capacitance creation which it used, current regulation and improving cost effectiveness with significant reduction in size and weight, compared to typical high frequency ac ballast. Experimental demonstration results for ten of parallel CCFLs with simultaneous ignition.
다수의 CCFL 구동을 위한 고역률 인버터 회로의 설계
김철진,박정오,박현철 한라대학교 2009 論文集 Vol.12 No.-
This paper presents an architecture for driving multiple paralleled cold cathode fluorescent lamps (CCFLs) for back lighting applications The key architecture is a proposed capacitive coupling approach for lamp ignition and paralleled multiple CCFL operation This system is consist of a flyback converter a single inverter to drive multiple lamps and conductive floating reflector The topology is capable of driving a number of parallel lamps with independent accurate lamp Leakage inductance and stray capacitance is used for the capacitive coupling So some advantages are achieved such as improved current regulation cost effectiveness and significant size and weight reduction compared to typical high frequency ac ballast The successful ignition and stable operation is verified from experimental results with ten parallelled CCFLs And this paper proposed a high power factor correction with the passive and active PFC that was satisfied with the IEC rules
Plasma 화학증착에서 AIN 박막성장에 미치는 공정변수 영향
김선효,박현철,김익현 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.3
The effect of plasma on the deposition rate of AlN film on a Si (111) substrate in PECVD process was investigated. AlCl₃ and NH₃ gases were used as precursors of aluminum and nitrogen, respectively. The process was carried out at relatively low temperatures under R.F plasma. Though some oxygen impurity was present in the film, the reasonably good stoichiometry of AlN was obtained. Employing the process variables such as temperature, plasma power, pressure and ammonia flow rate, the growth rate and refractivity index of coating layers were studied. The result of XRD analysis showed, the amorphous AlN film was formed at the low temperature of 500℃, while the crystalline structure was developed at higher temperatures.