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Onechip Microcontroller에 의한 압전 변압기를 이용한 T5 28W급 형광등 전자식안정기에 관한 연구
황락훈(L.H. Hwang),신양호(Y.H. Shin),조상로(S.R. Cho),장은성(E.S. Jang),조문택(M.T. Cho),안익수(I.S. Ahn),김주래(J.R. Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper, In order to solve the problem is proposed using a new type of electronic ballast that the traditional magnetic ballasts operated at 50-60Hz have been suffered from noticeable flicker, high loss, large crest factor and heavy weight which is composed of rectifier, active power corrector, series resonant half bridge Inverter, micro-controller and piezoelectric transformer for driving for driving T5 fluorescent lamp were manufactured The proposed electronic ballast operated at high frequency (about 75kHz) shows a input power factor of more than 0.995, total harmonic distortion of less than 12% and lamp current crest factor of less than 1 5, respectively. Output power and efficiency showed 28w and 85%, respectively. Accordingly, It is considered that the ballast using piezoelectric transformer can replace the typical electronic ballast
압전변압기와 CCFL 모델링에 의한 전자식 안정기 해석
황락춘(L.H. Hwang),장은성(E.S. Jang),신양호(Y.H. Shin),조상로(S.R. Cho),조문택(M.T. Cho),안익수(I.S. Ahn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A CCFL model for high frequency dimming electronic ballast simulation is presented in this paper. The model can be utilized for an electronic ballast simulation with continuous dimming and transient mode simulation such as step dimming<br/> The piezoelectric transformer is evaluated using an AC analysis. The electronic ballast composed of piezoelectric transformers and ZVS Inverter was implemented. It enables a fluorescent lamp to be turned on stably.,<br/> simulation of a high frequency electronic ballast which operates a fluorescent lamp at high frequency is proposed simulation is carried out using PSPICE program to illustrate the performance of the circuit
Linear Coons Interpolation을 이용한 SEAM 요소의 디프드로잉 탄소성 유한요소 해석
신양호,심현보,임상헌,서의권 嶺南大學校 工業技術硏究所 1996 工業技術硏究所論文集 Vol.24 No.1
In the present study, using the linear Coons interpolation SEAM(Shear Energy Augmented Membrane) elements have been developed. Linear Coons interpolation is used to calculated the transverse shear strain of a base element between the adjacent elements and the base element. Maintaining the numerical efficiency of conventional membrane elements, the effect of out-of-plane deformation(transverse shear deformation at element edge) has been incorporated for the purpose of computational stabilization without introducing additional degrees of freedom. From the circular, square, and rhombic blanks, computations are carried out for the deep drawings of square cup to check the validity and the effectiveness of proposed SEAM elements. For the square and rhombic blank, experiments are carried out and the computational results are compared with the experimental results.