Uninterruptible power supply apparatus including a control circuit that executes a first mode when supply of a first AC electric power from a commercial AC power supply is resumed at a time of discharge end

摘要

In this uninterruptible power supply apparatus, even after electric power supply to a load stops due to prolonged power failure time, the operation of an inverter is continued, a DC power supply voltage is generated based on an output of the inverter, and a control circuit is driven by the DC power supply voltage. Therefore, when electric power supply from a commercial AC power supply is resumed during the stop of electric power supply to the load, electric power supply to the load is automatically resumed by the control circuit.