Uninterruptible Power Supply Device

Abstract: This uninterruptible power supply device has a normal mode in which power supplied from an AC power supply is supplied to a load a backup mode in which the power stored in a storage battery is supplied to the load during a power failure of the AC power supply and a deterioration diagnosis mode in which the deterioration state of the storage battery is diagnosed. The control device of the uninterruptible power supply device periodically shifts to the deterioration diagnosis mode during execution of the normal mode. During execution of the deterioration diagnosis mode the control device stops the charging of the storage battery by stopping the operation of a power converter. The control device measures the voltage (VB) of the storage battery at a first timing (t2) after the lapse of a first time (T1) after stopping the charging of the storage battery and diagnoses the deterioration state of the storage battery on the basis of the measured value (VB1) of the voltage of the storage battery at the first timing.

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