抄録
This paper presents an integral-proportional sliding-mode controller (IPSMC) for a single-phase diode-bridge power-factor-corrected single-ended-primary-inductor-converter (PFC-SEPIC) rectifier supplying to an inverter-fed ac motor drive. Generally, to achieve high-performance time response of the ac motor drive, the components for the motor drive setup usually contain a diode-bridge rectifier, step-up/step-down converter, and pulse-width modulation inverter. However, the power efficiency for the ac power source is often deteriorated mainly due to the poor power factor (PF) in the AC power line. Therefore, the EPSMC for the single-phase diode- bridge PFC-SEPIC rectifier is developed for improving the PF of the AC power line and regulating the DC output voltage of the rectifier. The proposed controller is derived from the state-averaged model of the SEPIC converter operating in continuous conduction mode. By using the IPSMC, the PF for the single-phase power source can effectively be improved and the dc output voltage of the rectifier can robustly be controlled. At last, simulation results are illustrated to show the validity of the proposed controller for practical applications.
