Research On High Performance Large Capacity Adjustable AC-DC Switching Power

Switching power has many remarkable characteristics such as high efficiency, smallness and lightness. Countries all over the world have extensive application in switching power, especially research on large capacity high-frequency switching power nowadays has already become the main research field of power electronics and many new research directions has derived from it. The main content of this paper is to develop a kind of high performance, large capacity adjustable AC-DC switching power. This paper has analyzed the theory of high performance, large capacity adjustable AC-DC switching power in detail, and has proposed the main circuit and control circuit designation. On this basis, this paper schemed out the hardware circuit and software and has carried on the debugging and modification of the hardware and software of the switching power. On the basis of analyzing the theory, this paper has discussed 3-phase uncontrolled rectifier, the full-bridge converter, high-frequency transformer, and filter of the main circuit of this switching power system. This paper explained the solution of this large capacity power system at the same time, namely some power modules are to be connected in parallel. This paper also has studied current sharing circuit while some power modules were being connected in parallel, in the part of current sharing circuit, this paper has introduced current sharing circuit on the base of average current in detail. On the voltage regulation part, this paper has analyzed PWM control circuit on the basis of SG1525 in detail. Direct current switching power studied in this paper has many characteristics such as adjustable output voltage, heavy output current, low voltage ripple and so on. It also has the functions of changing output voltage gear, remote-control etc. It is mainly used to test many kinds of direct current machine, the experimental result indicated that the switching power has reached the design demand, thus it has proved the exactness of the theory analyses, so, this switching power has wide application fields.