Research On Power Factor Correction System Based On SOPC

Because of the large-scale application of the power electronic equipments, electrical energy has been more fully utilized, but it has brought serious harmonic pollution in power network at the same time. In order to improve the input power factor of the power electronic equipments, on the basis of the continuous development of digitizing control technique and programmable logic devices, a type of Boost-PFC equipment based on SOPC, with an average current control mode, was designed by the comparison and selection above the topological structures and control methods of the power factor corrective circuit. The strategy of double-closed-loop PI control of current and voltage is adopted in the equipment. The main research work is as follows:(1)Deep research of the power factor correction technology and SOPC technology is made and the parameter and the type of various main circuit components of the system are determined according to the requirements of this subjecs and theoretical analysis. In the system, Cyclone II series EP2C8Q208C8N chip made by Altera company is chosen as the main CPU, and corresponding configuration circuit and peripheral circuit of FPG A are designed and constructed.(2)A11AD acquisition control storage module, a frequency divider module, a double-loop PI control module, and a signal generation module of PWM are implemented in FPGA with the programming language of VHDL. Various modules which have realized their function and other peripheral interfaces are added to the Avalon Bus in SOPC Builder. And Nios II embedded soft core processing system of PFC system has been finally constructed. (3) The system software has been completed. In which the development of the main program, interrupt service routines and the corresponding drivers are made in Nios â…¡9.0IDE to coordinate various peripheral modules of the control system. The expected control target has been reached efficiently and reliably by the cooperation of the hardware and software in the system.Finally, the system simulation is made by SIMULINK in MATLAB7.0and the simulation results were given. At the same time, an experimental prototype operating at500W output power is developed and the corresponding experiments are done. The simulation results and experimental data fit to the theoretical results quite well, and the correctness of the system design has been proved.