Two-dimensional fuzzy PID switching power supply controller based on FPGA

This paper proposed a control method combining fuzzy PI and fuzzy PD to implement the phase-shifted full-bridge switching power supply control. The method can meet the control demands of the object´s time-varying characteristics. It does not rely on a fixed mathematical model, and it can adjust control parameters on-line. The system simulation model is built via Matlab/Simulink, and fuzzy control rules are determined. The results of simulation analysis show that the control effect using this method is better than traditional PID algorithm in switching power supply. Two-dimensional fuzzy PID controller based on FPGA has been designed, and it could effectively be applied to control of 3KW phase-shifted full-bridge switching power supply.