| 摘要 |
An uninterruptible power supply system includes an inverter (3) for converting uninterruptive DC power from a storage battery (9) into AC power, an inverter transformer (4) and an AC filter (5) connected to the inverter (3), a first current detector (10, 11) for detecting an output overcurrent of the inverter (3), a switcher (15) for switching the inverter mode (power supply through the inverter (3)) to the commercial power source mode (power supply from the commercial power source (1)), and a second current detector (12, 13) for detecting an overcurrent to a load (8). When the first current detector (10, 11) is operated, the inverter mode is temporarily switched to the power source mode by the switcher (15). At the same time, if the overcurrent of the load (8) is removed in accordance with the discrimination result of the second current detector (12, 13), the power supply mode is restored to the inverter mode from the commercial power source mode. |
