Investigation On Optimization Technique Of The Switching Mode Power Supply

With the development of power electronics, switching mode power supply (SMPS) must have higher frequency, higher power density, higher efficiency, higher power factor (PF) and higher reliability. To be practicability, the circuit must be simple and small. And to achieve these, people have done much work in power devices selection, topology research, control circuit mend, and power devices layout. However, depended on the designer's experience, the design may be a better one, but always not the best.In recent years, people introduced powerful mathematical programming into the design of SMPS to achieve the best design. It forms the mathematical optimization technology of the SMPS. Compare with common design, it improves the quality, shortens the period and eases the design finalize. The application of optimization technology in two typical circuit are presented in the paper. The main results are as follows. It discusses the research background and actuality, and introduces the foundation of the technique. On the base of the initial design of Boost PFC converter, it introduces the non-linear programming(NLP) technique. And it's optimization result indicates the objective function obtaining the best value, at the same time meeting the other performance guideline. The application of the non-linear programming(NLP) technique has been discussed in the Buck circuit in depth. The plot of the experiment and simulator indicates that the feasibility of the optimization technique in the SMPS. A brief discussion on the future application of optimization technique in the design of SMPS is presented.