Patent ID: 7523333

Claim:
A power supply apparatus for electrical and/or electronic user devices, comprising: at least one primary power source; at least one secondary power source; at least one electrical and/or electronic user device to which electric power originated from at least one of said primary or secondary power sources is to be delivered; and an uninterruptible power supply which is selectively connectable electrically to said at least one primary and secondary power sources and user device, wherein said uninterruptible power supply comprises at least one electric current management unit which is suitable to connect electrically said primary power source to said user device in order to deliver electric power up to a preset threshold value and to activate/deactivate the electrical connection of said secondary power source to said user device in order to deliver a remaining electric power absorbed by said user device, wherein said primary power source is an ordinary electrical mains, said secondary power source comprises at least one rechargeable battery, and said electric current management unit comprises electric connector means for electrical connection of said primary power source to said at least one battery which are suitable to allow delivery of electric power from said primary power source in order to recharge said at least one battery, a sum of the electric power delivered to said user device and of the electric power delivered to said at least one battery being substantially lower than, or at the most equal to, said threshold value.