High Power Factor Control of Brushless DC Motor Drive System without Electrolytic Capacitor

摘要

This paper proposes a novel control strategy for the brushless DC motor drive system fed by electrolytic capacitor-less inverter. In order to obtain high power factor, this paper proposes a new control method that regulates the inverter input current. The calculated compensation current of small film capacitor is subtracted from the ideal ac input current, which is regarded as the ideal inverter input current. The inverter input current is regulated by a PI controller, and the output of PI controller is used as duty-cycle of PWM technique. Meanwhile, the PWM_ON_PWM pattern is used in the proposed system, which can reduce the torque ripple in BLDCM. The effectiveness of the proposed system has been verified by simulation and experiment.