Uninterruptible power supply

摘要

An uninterruptible power supply carrying a battery pack (100) conductively connected to a power supply control section (50) by means of a connector (104) in a replaceable manner wherein the battery pack (100) and the power supply control section (50) are housed in a main frame body (10) having an opening (12) for the battery pack (100) and the opening (12) can be opened or closed by a protective cover (14). The power supply has also a protective cover detachment detection switch (22) for detecting detachment of the protective cover (14), and if detachment of the cover (14) is detected by this switch (22) during charging of the battery pack (100) or during back-up power supply by the battery pack (100) at the time of service interruption, an internal switching circuit (60) of the power supply control section (50) is forced into a substantially open state, or an alarm buzzer (70) generates alarm.