Based On The Digital Switch Power Research And Design Of Fuzzy Pid Control

Traditional power switch supply usually adopt analog solution, which has developed maturity, clear flow path, upper reliability, and take advantage in costing, response time and board area. With the development of digital design, power supply engineer not only require real time monitoring system condition, but also demand flexibly set up system parameter, quickly fault repairing, accelerate research process. Digital design accelerates the research of controller in power switch supply, and the research environment can be reused. System upgrade can be realized only by modifying hardware description code. Under this circumstance, digital power switch supply design become one of the hotspots of power supply.In the first of this paper, the principle of bridge topology is studied, and compared with other conventional topology. The suitable application of bridge topology is also analyzed. The principle of selecting register, capacity, and inductance in bridge topology is discussed in the end of this chapter.PID control is adopted in this paper to operate sampling voltage. As the mature closed loop control pattern in industry, PID control is widely used in numerous fields such as energy, medicine, manufacture. Two kinds of PID arithmetic are deduced, both advantage and disadvantage of them are compared. A complete fuzzy logic is established to set PID parameters. The peripheral topology model, fuzzy logic model, PID controller model and PWM generator model are established in Simulink. The result of model simulation is analyzed to support system hardware design.Based on model simulation, verilog code is compiled to realize fuzzy logic PID arithmetic and DPWM generator module with XILINX Vertex-Ⅱ series XC4VSX35FPGA chip. Pre and post simulation are accomplished and bit file is generated to download into FPGA chip. Peripheral board and FPGA board are connected to debugging system, and the feasibility of fuzzy PID control is verified.