Patent Number: 7,710,747

Title: Voltage-source inverter apparatus utilizing ripple voltage

Abstract: An inverter apparatus that can lengthen a lift span provides only a noise absorption film capacitor in a DC intermediate circuit between rectifying and inverter circuits, instead of a conventional electrolytic capacitor. In a voltage command generating unit, when a frequency set by a frequency setting unit is within a predetermined range including the frequency of an AC input power supply, PLL control is performed to make the frequency set by an output voltage command signal equal to the frequency of the AC input power supply voltage, and to substantially synchronize the peak value of the inverter circuit output voltage with the peak value of a voltage formed between both ends of the film capacitor. Accordingly, output voltage amplitude is generated when the frequency set by the output voltage command signal equals the frequency of the voltage of the AC input power supply.

Inventors: Matsumoto; Yoshihiro (Mie, JP)

Assignee: Fuji Electric Systems Co., Ltd.

International Classification: H02J 3/36 (20060101)

Expiration Date: 5/04/12018