Design And Implementation Of Digital Switching Power Supply

Power is an important component of electronic equipment, electronic equipment directly affects the quality of the work, so more and more attention. With the power electronics industry, electronic equipment from the initial linear power supply to the switching power supply development. Switching power supply in the electronics industry play an increasingly important role, has been widely applied to aviation, communications, transportation and other fields. Control the power of analog circuits and applications have been developed for many years, but it is still much to be desired. The field of digital switching power supply into power the focus of attention because of the relative analog control digital control has significant advantages:simplifies the hardware design, analog circuits to overcome the temperature drift of the parameters in the title, flexible control and easy to implement advanced control. In this paper, using digital switching power supply control method of the analysis and design, to the performance in practical applications more stable, smaller, more efficient switching power supply.This paper introduces the basic concepts of digital power, features and current trends at home and abroad, through the digital PWM modulation analysis and discussion of various ways for the design of digital switching power supply system provides a theoretical basis and guidance. Design requirements for the project were the main circuit design, circuit design process in the main details of the topics used in full-bridge converter, and the main circuit components of the selected parts were analyzed and calculated. For the choice of the main power conversion and driving control and protection technology, we conduct key research.Secondly, according to design needs, the paper also based on M0516's full digital control system was introduced, constitutes a power control system are discussed in various hardware and software module design principles and programs. External control system include the main controller circuit, the output voltage and current sampling circuit, keyboard and digital display circuit, auxiliary power circuit. Control using PWM control, software design including microcontroller applications, A/D conversion subroutines, PID algorithm subroutine, keyboard and digital display subroutine and so on.Entire paper to the main line power supply design, the detailed analysis of the circuit, based on the main circuit parameters for system design, control loop design, aided circuit design, simulation, software.