Research on Output Ripple Suppression of Two-Phase Interleaved Parallel Buck Converter

Constant current sources are widely used in various fields such as industrial production, aviation, and military applications. The level of ripple in these constant current sources is crucial for ensuring the stability and reliability of equipment and systems. This study focuses on the two-phase interleaved parallel Buck circuit. Based on the analysis of its ripple suppression principle, the circuit parameters were designed and the control strategy was optimized. Finally, the designed two-phase interleaved Buck circuit was validated in Simulink for its effectiveness in suppressing current ripple under conditions of load stability, load fluctuations, power supply fluctuations, as well as simultaneous fluctuations in load and power supply. Simulation results indicate that the two-phase interleaved Buck converter exhibits promising performance: the output current ripple is less than 1% during load stability, less than 1% during a 10% power supply fluctuation, less than 1.5% during a 10% load fluctuation, less than 1% during rapid recovery to stability after load transients, and less than 1% during simultaneous load and power supply fluctuations. Theoretical analysis and simulation validation in this study effectively demonstrate the converter’s ability to suppress current ripple under perturbations within a certain range of both load and power supply.