| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter apparatus capable of lengthening a life span of the inverter apparatus, and also capable of improving a power factor looking at the inverter apparatus from an AC input power supply. <P>SOLUTION: Instead of a conventional electrolytic capacitor, only noise absorption film capacitor 21 is used in a DC intermediate circuit between a three-phase full-wave rectifier circuit 11 and an inverter circuit 13. In a voltage command generating means 25, when a frequency set by a frequency setter 14 is within a predetermined range including the frequency the AC input power supply 1, the frequency set by PPL control having a voltage phase of the AC input power supply 1 as a reference value using an output voltage command signal of the voltage command generating means 25 is made equal to the frequency of the AC input power supply 1, and the timing of the peak value of an output voltage in the inverter circuit 13 is made to substantially coincide with that of the peak value of both end voltages of the film capacitor 21. <P>COPYRIGHT: (C)2008,JPO&INPIT |
