| 摘要 |
PROBLEM TO BE SOLVED: To provide an uninterruptible power supply that allows improving the accuracy of an output voltage and improving the input power factor even when an input voltage of an AC power supply varies.SOLUTION: An uninterruptible power supply 100 includes: charging means for charging a power storage section 23 by means of power of an AC power supply 1; first power conversion means for converting AC power into DC power; second power conversion means for converting an output from the first power conversion means into AC power; third power conversion means for discharging energy from the power storage section 23 at the time of occurrence of abnormality in the AC power supply 1 and supplying DC power to the second power conversion means; and fourth power conversion means for moving charges between a positive-side capacitor 24a and a negative-side capacitor 24b of the second power conversion means. The uninterruptible power supply 100 outputs a sinusoidal waveform only for a predetermined period centered at a zero-cross point of an AC output. |
