Power Factor Improvement of Single-Phase Diode Rectifier Circuit by Field-Weakening of Inverter-Driven IPM Motor

摘要

This paper proposes a novel inverter drive system to improve the input power factor of single-phase diode rectifier. Conventional rectifiers need a high-frequency switching device and a reactor to improve the input power factor. However, the proposed power converter does not need the switching device, electrolytic capacitor, or reactor. By making many ripples across the DC-bus voltage, the input power factor can be improved. The proposed system consists of only a single-phase diode rectifier, small film capacitor, three-phase inverter, and motor. The proposed system adopts an interior permanent magnet (IPM) synchronous motor. The IPM motor is well known as a high-efficiency motor and can realize field weakening. The basic ideas of the inverter control method are based on the following operations: the inverter's controlled synchronous with the DC-bus ripple voltage by field-weakening method, and direct active power feeding from the source side to the motor without smoothing the DC-bus voltage. This paper describes that the proposed method can obtain an input power factor of 97.3% by experimental tests, and realizes the goals of small size and long life of the system.