Design Of Switching Power Supply Based On Phase-shifted Full-bridge Soft Switch

Electric car is now becoming the new developing direction of automobile industry, due to its power saving and non polluting. As a core component of an electric car’s charging system, the power charger(switching power supply) provides the energy source for an electric car, the performance of the power charger directly affects the battery life and performance. This study is based on the current development of the switching power supply, develop an on-board car charger prototype with phase-shifted full-bridge soft switch and using UC3875 as its control center, aiming to implement the charging process of an electric car, improve the charging efficiency and the quality of charging.First, the development status and trend of switching power supply is expounded,determining the goals and objectives to accomplish. As following, advantage of the soft switch over the hard switch is studied. On this basis, the working process of the various modal during the first half cycle of the phase-shifted full-bridge soft switch power supply is introduced as a theoretical basis for the circuit structure design of each functional module in the power supply besides the parameter design and manufacture method of the power switch tube, input and output capacitor, transformer and other important components.At last, using Saber as the platform, establish a model of the phase-shifted full-bridge soft switching power supply module, and proceed related simulation to verify the the feasibility and superiority of the technology. After that, the power supply module is assembled.