Design Of Digital Controller For BUCK Converter Based On FPGA

In recent years, with the rise of intelligent hardware, a lot of electronic products continue to emerge. But with the increase in product features, the power consumption is constantly rising. Therefore, power requirements become higher and higher. At present, DC-DC converter is becoming a mainstream direction. The position of FPGA in the field of DC-DC converter becomes increasingly important because of it’s flexible, efficient and rapid pace of development advantage. Based on the study and analysis of the various basic common DC-DC converter most in use, this paper designed a digital control BUCK type DC-DC converter based on FPGA. The main work is as follows:First of all, this paper introduces the basic principles of DC-DC converter and different work modes. And it also explains the specific methods of how to select the Inductance and capacitance of DC-DC converter; more over it compares with the various characteristics of BUCK converter based on microcontroller, DSP and FPGA, and the advantages of BUCK converter that based on FPGA.Secondly, we discuss the effect of limit ring influence and the reasons for the emergence on BUCK converter, and accordingly propose a way to avoid this situation. Then we choose chip and resolution ratio of the ADC sampling module according to the requirements of this plan, and get digital incremental PID algorithm from the discretization of traditional PID control algorithm. Finally, according to the design of the first two modules, we give the resolution and specific method of the DPWM module in this paper.At last, through the simulation and experimental test of the system, we know that this DC-DC converter can satisfy the design features, and the dynamic performance and stability are very good.