| 摘要 |
Power source units having an AC/DC conversion circuit and a DC/DC conversion circuit, and a battery unit having a battery and a DC/DC conversion circuit, are connected in parallel to a common DC bus to which both are linked, and a load is connected to the DC bus. In a normal mode, power is supplied to the load by the power source units. When there is an outage of an AC power source, the system is transferred to a back-up mode and power is supplied by the battery unit. When the load exceeds the rated total of the power source units, when an input voltage falls and sufficient power cannot be supplied even without reaching the power outage, or when a portion of the power source units is halted due to a fault and/or maintenance, etc., the system is transferred to an assist mode, and when the power supplied from the power source units is insufficient, the power equivalent to the shortage is supplied by the battery unit. |
