An AC Constant Current Power Supply Design Based On Linearity Power Amplifier

The point to constant current power supply which is a special technology that integrates several subjects such as mechanics, electronics and control knowledge. Its development is closely relationship with progresses of other science and technology subjects, it has important status in the multitudinous country specially in the developed country. In recent years, manufacture technology of our country has been developing quickly, but according to the developed countryl, there are still big disparities. The problems like low parameter examination precision, bad capability of real time, anti-jamming are exist. According to this question, this paper has established a control system of point to constant current power supply based on AT89C51; enable the system to have the functions as high speed, high precision, strong usability, simple circuit and so on.In the course of exploitation, we mainly have completed missions below:1 The hardware system .it is the core of the whole point to constant current power supply system. It breach the tradition and optimized electric circuit structure.use AT89C51 as the design core, the paper uses unitary method to control the system.2 Control system software: using the C language as design plat, gathering electric current by utilizating the gradually approaches the algorithm, and using the fuzzy control theory to control the drive system.3 later period antijam designs: aim at the function of the bad environment of point to constant current power supply, and the control system is easily disturbed in the jointing process, on the hardware the transformer isolation, high speed light pair, separate simulate and digital electron metal shield is used,, on software used the filter, wipe off the redundancy, trap and so on.The paper design the point to constant current power supply system based on AT89C51, can output balanced current, has the function of high speed, high precision, strong expansionary and so on.