Boost-Based Active Power Decoupling Converter With Voltage Complementary for Electrolytic Capacitor-Less PMSM Drive System

A new boost-based active power decoupling circuit (APDC) with voltage complementary is proposed for electrolytic capacitor-less (ECL) permanent magnet synchronous motor (PMSM) drive systems. To increase the dc-link voltage level of the drive system, the decoupling capacitor of the APDC and the output capacitor of a boost converter are connected in series. Then, the decoupling capacitor and the boost output capacitor are complementarily controlled by the APDC to suppress the dc-link voltage ripple effectively. The capacitance and operation voltage of the two capacitors are diverse, improving the drive system's robustness to capacitance. By using this APDC, the speed range of ECL drive systems can be increased and good performance of PMSMs under stable and dynamic operation conditions can be implemented due to small dc-link voltage ripple. Finally, the experiments with the ECL drive system are accomplished to verify the feasibility.