Patent ID: 8115338

Claim:
An emergency power unit for apparatuses, the unit comprising: at least one connector connectable to a mains socket; a battery charging device having an input connected to said at least one connector the battery charging device comprising: accumulator means arranged to accumulate electric power coming from said at least one mains connector; and conversion means, arranged to convert the accumulated electric power into a power supply that can be used by the apparatuses and to output said power supply; the emergency power unit further comprising a power supply delivery device comprising: first connection means connectable to first power supply means by means of at least one respective connection cable for being supplied with power; second connection means connectable to at least one of said apparatuses to supply it with power; switching means connected to the output of said conversion means and arranged to switch the connection from said first connection means to said conversion means and vice versa to provide the power supply; at least one detector arranged to detect the presence of power at the first connection means; at least one control logic having an input connected to the detector; and at least one switching circuit controlled by the control logic in order to switch the connection from at least one of said first connection means to at least one of said conversion means and vice versa; and wherein said at least one control logic comprises means arranged to cause the substantially instantaneous switching of said switching circuit from said first connection means to said conversion means, and to cause the switching from said conversion means to said first connection means with a predetermined delay.