The Development Of Large-capacity High-frequency Switching Power Supply

This paper introduces the practical significance of the high frequency switching power supply developed by us, and introduces the corresponding railway standards of the People's Republic of China. The main circuit and the control circuit are introduced in this paper. During the development of the switching power supply, the research method includes the theory analysis, the simulation and the practical experiments.The fundamental of the switching power supply is illustrated in this paper, the four kinds of the circuit topology configuration containing the insulated transformer are presented, and the advantages and the disadvantages of the circuit topology configuration are analyzed. The fundamental and the mode of the full bridge switching circuit are emphasized. According to the analysis, the main circuit topology configuration is determined. The software implements the simulated test of the main circuit. The control circuit is designed for satisfying the standards. At the foundation of the theory analysis and the practical experiments, a sample is manufactured; the amelioration is carried out continuously.This paper discusses the engineering optimized design of the switching power supply, the disadvantages of the feasible design, the definition of the optimized design, the mathematic fundamental and the concretely realization of the optimized design are detailedly explained. According to the analysis of working principle of the switching power supply, the nonlinear relationship between the circuit's design parameters and the performances of the circuit are established by the BP Neural Networks, the parameter's optimization in the spaces of the feasible design's parameters is implemented by the Genetic Algorithm, and a optimized parameters' team is gained by the GA toolbox. The simulated result of the optimized design is better than the feasible design.At last, the EMC design of the switching power supply and the EMC's standards in the railway standards of China are briefly introduced.