| With the rapid development of modern communication technology, the power used in communication need higher requirements, such as the weight, volume, reliability, efficiency. The application of high-power full-bridge converter has a simple structure, high output power, high efficiency, easy to realize soft-switching, the small of the power switch voltage and current stress suffered, therefore, it is of great significance for its research.Firstly,the thesis has explained the basic principle of the phase shift controlled ZVS DC / DC full-bridge converter, and analyzed the full bridge converter of some key problems: lagging leg to achieve zero-voltage, the duty cycle loss, the transformer primary side DC component of the inhibition, the output rectifier diodes parasitic oscillation and diode commutation. At the same time, the Phase Shift Full Bridge ZVS DC / DC with the network were analyzed.Secondly,the thesis has selected the main circuit topology and has given the methods of parameters designing and calculation for 48V/50A main circuit , including the design of input filter capacitors, high frequency transformer, power switch MOSFET, resonant inductor, output filter inductor, the output filter capacitor and blocking capacitors. Meanwhile, it has established small-signal modeling for the full bridge ZVS DC/DC converter. At last, it has introduced the conventional PID controls, fuzzy control and fuzzy PID principles, and then analyzed, compared, obtained fuzzy PID has a good dynamic performance and static performance with the MATLAB simulation. Finally, based on fuzzy PID control, the thesis has made a modeling and simulation for 48V/50A ZVS DC / DC full-bridge converter.The results show that the design phase full-bridge DC / DC converter can well realize the soft switching, efficiency, output voltage with good stability. Through phase full-bridge DC / DC converter's introduction, analysis, design, modeling and simulation, it provided guidance for phase shift full bridge converter. |
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