Digital Constant Current Source System Based On DSP

Along with the development and progress of science and technology,power as any scientific laboratories' most basic and important one of the experimental equipments,its accuracy and stability during the work has been strongly concern by the users.Because of the cost and integration,and other strong points of the digital signal processor(DSP),it plays a decisive role in electromechanical integration,intelligent zed instrumentation,industrial control and other areas.First,this design introduced the basic concept of digital powers,features,and the development trends in internal and international nowadays.Through analyses and discussions of variety of ways of digital PWM modulation,it gave comparative results between digital PWM and stimulant modulation;it included single-along leading-edge,single-along trailing-edge,leading-triangle and trailing-triangle,and the Amplitude-frequency characteristics and Phase-frequency characteristics.It provided a theoretical basis and guidelines for the design of digital switch mode power supplies.Secondly,according to the design requirements,used DSP as the control core,designed the hardware system of the digital constant current source system,including analyses of topologies of switch mode powers,design of drivers of MOSFETs,DSP control core circuit, and sampling system circuit and so on.Next,according to the design requirements and the hardware basic system,analyzed digital PID control arithmetic,especially analyzed incremental digital PID and the derivation of formula and the way to realization.It exploited corresponding system software,made up of the orbicular switch mode power control system,and it enriched the performance and functionality of the system,actualizing the aim of digital constant current control.At last,through the results of debug and analysis by the actual system,sum up the characteristics and lacks,pointed out the further improvements and outlook.