Switching Period Influence of Forward Converter’s Nonlinear Phenomena

• Main Authors: Wei Chang, 張維
• Other Authors: Hwang-Jin Wu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/36783960363958545916

碩士 === 龍華科技大學 === 電機工程系碩士班 === 100 === 　　In this thesis, the theme for the forward converter UC3842 current mode control nonlinear phenomena affected by the switching period. In this study, the derivation of the forward converter state equations and discrete analytic solution, and the converter operating in continuous current mode, MATLAB/SIMULINK and IsSpice are used to construct simulation of the converter whose operating under vary switching period parameters. The output voltage, inductor current waveforms and phase-plane portraits are observed. It can be seen that the system exhibits nonlinear dynamics from period-one operation through period-doubling to chaos phenomena as the switching period are changed. From the simulation results, it is clearly evident that SIMULINK and IsSpice provide consistent results and verify the mathematical models and able to really understand the nonlinear behavior of the forward converter. Then use the Protel PCB Layout software to complete the experimental circuit output voltage waveform, measure physical circuit by switching cycle, the inductor current waveform and phase plane, by the cyclical stability to the period-doubling bifurcation to chaos phenomenon, to verify the simulation correctness. Finally, using the LabVIEW software and its PXI system to measure Poincar? pattern bifurcation diagram comparing simulation of the forward converter, and implementation combined with LabVIEW result consistency.