A TWO STAGE AC-DC CONVERTER FOR SPEED CONTROL OF A DC MOTOR

This paper presents a simulation-based study of a two-stage power conversion system comprising an AC-DC rectifier followed by a DC-DC boost converter for motor drive applications. The system was evaluated for its dynamic performance under different load torque conditions (10 Nm, 15 Nm, and 20 Nm). The AC supply is first converted to a stable 45 V DC using a full-bridge rectifier. This rectified voltage is fed to a boost converter whose output fluctuated between 24 V and 48 V, influenced by both load torque variations and converter dynamics. The simulation was conducted in MATLAB/Simulink, and the motor drive response was observed under each torque level. The analysis shows that the converter output voltage exhibited higher ripple and instability with increasing torque demand, indicating the need for improved regulation and compensation techniques. Despite the fluctuations, the system demonstrated satisfactory performance in maintaining operational continuity. These findings can be useful for optimizing power stages in electric motor drive systems where load torque varies significantly. Future enhancements could include implementing advanced control strategies such as PID, fuzzy logic, or sliding mode controllers for better output voltage stabilization and improved transient response.