Based on the Buck Circuit, Precise Regulation of Output Voltage is Achieved from Closed-loop control to Compound Control

With the advent of the new energy era, the requirements for power supply voltage regulation accuracy and dynamic response in high-precision equipment are becoming increasingly strict.As a core step-down topology, the Buck circuit has extensive applications in solar power generation, electric vehicle charging and discharging, and other fields.However, its traditional open-loop control has inherent defects such as large output voltage deviation and slow recovery.This study is based on the design of voltage closed-loop feedback and compound control.Through SIMULINK simulation comparison, it is verified that the closed-loop PI control can stably output voltage accuracy to ±0.5%, significantly improving the anti-disturbance performance.The composite control design with feedforward compensation has reduced the recovery time by 56%, achieving a collaborative breakthrough of high precision and fast response.Finally, this article compares the advantages and disadvantages of the three types of control and looks forward to the directions of high frequency, intelligence and systematization.The aim is to enhance the output voltage accuracy, dynamic response and anti-interference capability of the Buck converter under complex working conditions.