Abstract
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. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(2): 66–73, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20047
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