Electrical device and method for feeding a secured for audiovisual reproduction system

Device for secure power supply for audiovisual reproduction system comprising a supply (2) connected to a main source (1) of electrical current, delivering by connections (20) at least a electric voltage determined at a central unit ( 6), the CPU comprising a program (60) comprising a computer operating program (62) for closing and backup files of the computer system and a program (62) start, characterized in that the device also comprises means (4) detection of a fall below a determined threshold, a fixed voltage supplied by the power supply (2) primary, means (11, 12, 13) connected for storing electric energy one hand to the source (1) of electric current, and secondly to a power supply (10) providing relief to the central unit (6) sufficient tension for its operation, by a circuit Automatic relief substitution (10) to the supply (2) Primary and means (5) for triggering a backup process after a predetermined time interval.