The Design Based On OB2201Switch Power Supply

Power supply, as the heart of electronic equipment, plays an important role in the era of rapid development of power electronics. In particular, switching power supply known as energy-efficient equipment represents the development direction of the regulated power supply. Switching power supply is composed of input protection circuit, EMI, rectifier filter circuit, high frequency transformer, output rectifier filter circuit, control circuit and so on,an important AC/DC converter of transforming of input AC voltage into DC output voltage. Currently, the switching power supply in order to meet the requirements of the development of modern electronic equipment, mainly in the intelligent, high-frequency, miniaturization direction of development, has now become the preferred product for small and medium power switching power supply.This paper designs the switching power supply, based on research and analysis of power-related information at home and abroad. Firstly, studies topology of the switching power supply and carries out a detailed analysis of the flyback topology. Secondly, emphasizes on analysis and research of the current control mode according to the power development trend. Besides, researches on the design of the transformer, especially on choice of parameters as well as transformer winding. Finally, installs voltage hardware circuit and collects relevant data in the combination of the above analysis.The main work of this paper as follows:(1) Analyzes the background, current status and future development trends of the switching power supply, and also describes the way it works, the control mode and topology.(2) Carries out a specific analysis of the primary circuit of the switching power supply and a detailed description of circuit parameter’s calculation methods and the choice of components.(3) Studies the basic principle of the control chip OB2201, designs the switch tube driving circuit and has a detailed analysis of it.(4) Transforms the theoretical design into the actual circuit, tests the relevant data, and both test results and experimental waveforms are to verify whether the design is feasible or not.(5) Summary and outlook.