Uninterruptible power supply apparatus

An uninterruptible power supply apparatus, comprising:

• a first power converter for converting an AD electric power inputted from a commercial power source into a DC electric power,
• a second power converter for converting said DC electric power into a desired AC electric powers to be supplied to a load;
• a storage means connected between said first power converter and said second power converter;
• a means for detecting an abnormality on said AC electric power inputted from said commercial power source;
• and
• a controller portion for controlling said first power converter and said second power converter, wherein said controller portion further comprises a means for limiting an increase of current within said first power converter accompanying with lowering of voltage of the AC electric power inputted from said commercial power source.

An uninterruptible power supply apparatus, comprising:

• a first power converter for converting an AD electric power inputted from a commercial power source into a DC electric power;
• a second power converter for converting said DC electric power into a desired AC electric power, to be supplied to a load;
• a storage means connected between said first power converter and said second power converter;
• a means for detecting an abnormality on said AC electric power inputted from said commercial power source;
• and
• a controller portion for controlling said first power converter and said second power converter, wherein said abnormality detecting means detects an interruption, without responding to a momentary voltage-drop on the AC electric power inputted from said commercial power source.