| 摘要 |
PURPOSE:To enhance reliability as an uninterruptible power supply device by providing means for supplying part of power to be supplied to a load to a storage battery at the time or normal input AC power source for a predetermined period and diagnosing a remaining capacity and a storage battery performance from a signal corresponding to discharging charge of the battery. CONSTITUTION:In order to decide capacity of a storage battery 18 when an AC power of an input AC power source 10 is supplied to a load 17 through an inverter 11, a rectifier 12 is stopped within a predetermined period, and the charge of the battery 18 is supplied to the load 17 through an inverter 14. The discharge current of the battery 18 is detected by a current detector 19, the discharging charge of the battery 18 is detected by a remaining capacity detector 21, thereby deciding the capacity of the battery 18. Thus, reliability of an uninterruptible power supply device can be enhanced. |
